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code/.venv/lib/python3.12/site-packages/websockets/__init__.py

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+from __future__ import annotations
+
+import typing
+
+from .imports import lazy_import
+from .version import version as __version__  # noqa: F401
+
+
+__all__ = [
+    # .client
+    "ClientProtocol",
+    # .datastructures
+    "Headers",
+    "HeadersLike",
+    "MultipleValuesError",
+    # .exceptions
+    "AbortHandshake",
+    "ConnectionClosed",
+    "ConnectionClosedError",
+    "ConnectionClosedOK",
+    "DuplicateParameter",
+    "InvalidHandshake",
+    "InvalidHeader",
+    "InvalidHeaderFormat",
+    "InvalidHeaderValue",
+    "InvalidMessage",
+    "InvalidOrigin",
+    "InvalidParameterName",
+    "InvalidParameterValue",
+    "InvalidState",
+    "InvalidStatus",
+    "InvalidStatusCode",
+    "InvalidUpgrade",
+    "InvalidURI",
+    "NegotiationError",
+    "PayloadTooBig",
+    "ProtocolError",
+    "RedirectHandshake",
+    "SecurityError",
+    "WebSocketException",
+    "WebSocketProtocolError",
+    # .legacy.auth
+    "BasicAuthWebSocketServerProtocol",
+    "basic_auth_protocol_factory",
+    # .legacy.client
+    "WebSocketClientProtocol",
+    "connect",
+    "unix_connect",
+    # .legacy.protocol
+    "WebSocketCommonProtocol",
+    "broadcast",
+    # .legacy.server
+    "WebSocketServer",
+    "WebSocketServerProtocol",
+    "serve",
+    "unix_serve",
+    # .server
+    "ServerProtocol",
+    # .typing
+    "Data",
+    "ExtensionName",
+    "ExtensionParameter",
+    "LoggerLike",
+    "StatusLike",
+    "Origin",
+    "Subprotocol",
+]
+
+# When type checking, import non-deprecated aliases eagerly. Else, import on demand.
+if typing.TYPE_CHECKING:
+    from .client import ClientProtocol
+    from .datastructures import Headers, HeadersLike, MultipleValuesError
+    from .exceptions import (
+        AbortHandshake,
+        ConnectionClosed,
+        ConnectionClosedError,
+        ConnectionClosedOK,
+        DuplicateParameter,
+        InvalidHandshake,
+        InvalidHeader,
+        InvalidHeaderFormat,
+        InvalidHeaderValue,
+        InvalidMessage,
+        InvalidOrigin,
+        InvalidParameterName,
+        InvalidParameterValue,
+        InvalidState,
+        InvalidStatus,
+        InvalidStatusCode,
+        InvalidUpgrade,
+        InvalidURI,
+        NegotiationError,
+        PayloadTooBig,
+        ProtocolError,
+        RedirectHandshake,
+        SecurityError,
+        WebSocketException,
+        WebSocketProtocolError,
+    )
+    from .legacy.auth import (
+        BasicAuthWebSocketServerProtocol,
+        basic_auth_protocol_factory,
+    )
+    from .legacy.client import WebSocketClientProtocol, connect, unix_connect
+    from .legacy.protocol import WebSocketCommonProtocol, broadcast
+    from .legacy.server import (
+        WebSocketServer,
+        WebSocketServerProtocol,
+        serve,
+        unix_serve,
+    )
+    from .server import ServerProtocol
+    from .typing import (
+        Data,
+        ExtensionName,
+        ExtensionParameter,
+        LoggerLike,
+        Origin,
+        StatusLike,
+        Subprotocol,
+    )
+else:
+    lazy_import(
+        globals(),
+        aliases={
+            # .client
+            "ClientProtocol": ".client",
+            # .datastructures
+            "Headers": ".datastructures",
+            "HeadersLike": ".datastructures",
+            "MultipleValuesError": ".datastructures",
+            # .exceptions
+            "AbortHandshake": ".exceptions",
+            "ConnectionClosed": ".exceptions",
+            "ConnectionClosedError": ".exceptions",
+            "ConnectionClosedOK": ".exceptions",
+            "DuplicateParameter": ".exceptions",
+            "InvalidHandshake": ".exceptions",
+            "InvalidHeader": ".exceptions",
+            "InvalidHeaderFormat": ".exceptions",
+            "InvalidHeaderValue": ".exceptions",
+            "InvalidMessage": ".exceptions",
+            "InvalidOrigin": ".exceptions",
+            "InvalidParameterName": ".exceptions",
+            "InvalidParameterValue": ".exceptions",
+            "InvalidState": ".exceptions",
+            "InvalidStatus": ".exceptions",
+            "InvalidStatusCode": ".exceptions",
+            "InvalidUpgrade": ".exceptions",
+            "InvalidURI": ".exceptions",
+            "NegotiationError": ".exceptions",
+            "PayloadTooBig": ".exceptions",
+            "ProtocolError": ".exceptions",
+            "RedirectHandshake": ".exceptions",
+            "SecurityError": ".exceptions",
+            "WebSocketException": ".exceptions",
+            "WebSocketProtocolError": ".exceptions",
+            # .legacy.auth
+            "BasicAuthWebSocketServerProtocol": ".legacy.auth",
+            "basic_auth_protocol_factory": ".legacy.auth",
+            # .legacy.client
+            "WebSocketClientProtocol": ".legacy.client",
+            "connect": ".legacy.client",
+            "unix_connect": ".legacy.client",
+            # .legacy.protocol
+            "WebSocketCommonProtocol": ".legacy.protocol",
+            "broadcast": ".legacy.protocol",
+            # .legacy.server
+            "WebSocketServer": ".legacy.server",
+            "WebSocketServerProtocol": ".legacy.server",
+            "serve": ".legacy.server",
+            "unix_serve": ".legacy.server",
+            # .server
+            "ServerProtocol": ".server",
+            # .typing
+            "Data": ".typing",
+            "ExtensionName": ".typing",
+            "ExtensionParameter": ".typing",
+            "LoggerLike": ".typing",
+            "Origin": ".typing",
+            "StatusLike": "typing",
+            "Subprotocol": ".typing",
+        },
+        deprecated_aliases={
+            "framing": ".legacy",
+            "handshake": ".legacy",
+            "parse_uri": ".uri",
+            "WebSocketURI": ".uri",
+        },
+    )

code/.venv/lib/python3.12/site-packages/websockets/__main__.py

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+from __future__ import annotations
+
+import argparse
+import os
+import signal
+import sys
+import threading
+
+
+try:
+    import readline  # noqa: F401
+except ImportError:  # Windows has no `readline` normally
+    pass
+
+from .sync.client import ClientConnection, connect
+from .version import version as websockets_version
+
+
+if sys.platform == "win32":
+
+    def win_enable_vt100() -> None:
+        """
+        Enable VT-100 for console output on Windows.
+
+        See also https://bugs.python.org/issue29059.
+
+        """
+        import ctypes
+
+        STD_OUTPUT_HANDLE = ctypes.c_uint(-11)
+        INVALID_HANDLE_VALUE = ctypes.c_uint(-1)
+        ENABLE_VIRTUAL_TERMINAL_PROCESSING = 0x004
+
+        handle = ctypes.windll.kernel32.GetStdHandle(STD_OUTPUT_HANDLE)
+        if handle == INVALID_HANDLE_VALUE:
+            raise RuntimeError("unable to obtain stdout handle")
+
+        cur_mode = ctypes.c_uint()
+        if ctypes.windll.kernel32.GetConsoleMode(handle, ctypes.byref(cur_mode)) == 0:
+            raise RuntimeError("unable to query current console mode")
+
+        # ctypes ints lack support for the required bit-OR operation.
+        # Temporarily convert to Py int, do the OR and convert back.
+        py_int_mode = int.from_bytes(cur_mode, sys.byteorder)
+        new_mode = ctypes.c_uint(py_int_mode | ENABLE_VIRTUAL_TERMINAL_PROCESSING)
+
+        if ctypes.windll.kernel32.SetConsoleMode(handle, new_mode) == 0:
+            raise RuntimeError("unable to set console mode")
+
+
+def print_during_input(string: str) -> None:
+    sys.stdout.write(
+        # Save cursor position
+        "\N{ESC}7"
+        # Add a new line
+        "\N{LINE FEED}"
+        # Move cursor up
+        "\N{ESC}[A"
+        # Insert blank line, scroll last line down
+        "\N{ESC}[L"
+        # Print string in the inserted blank line
+        f"{string}\N{LINE FEED}"
+        # Restore cursor position
+        "\N{ESC}8"
+        # Move cursor down
+        "\N{ESC}[B"
+    )
+    sys.stdout.flush()
+
+
+def print_over_input(string: str) -> None:
+    sys.stdout.write(
+        # Move cursor to beginning of line
+        "\N{CARRIAGE RETURN}"
+        # Delete current line
+        "\N{ESC}[K"
+        # Print string
+        f"{string}\N{LINE FEED}"
+    )
+    sys.stdout.flush()
+
+
+def print_incoming_messages(websocket: ClientConnection, stop: threading.Event) -> None:
+    for message in websocket:
+        if isinstance(message, str):
+            print_during_input("< " + message)
+        else:
+            print_during_input("< (binary) " + message.hex())
+    if not stop.is_set():
+        # When the server closes the connection, raise KeyboardInterrupt
+        # in the main thread to exit the program.
+        if sys.platform == "win32":
+            ctrl_c = signal.CTRL_C_EVENT
+        else:
+            ctrl_c = signal.SIGINT
+        os.kill(os.getpid(), ctrl_c)
+
+
+def main() -> None:
+    # Parse command line arguments.
+    parser = argparse.ArgumentParser(
+        prog="python -m websockets",
+        description="Interactive WebSocket client.",
+        add_help=False,
+    )
+    group = parser.add_mutually_exclusive_group()
+    group.add_argument("--version", action="store_true")
+    group.add_argument("uri", metavar="<uri>", nargs="?")
+    args = parser.parse_args()
+
+    if args.version:
+        print(f"websockets {websockets_version}")
+        return
+
+    if args.uri is None:
+        parser.error("the following arguments are required: <uri>")
+
+    # If we're on Windows, enable VT100 terminal support.
+    if sys.platform == "win32":
+        try:
+            win_enable_vt100()
+        except RuntimeError as exc:
+            sys.stderr.write(
+                f"Unable to set terminal to VT100 mode. This is only "
+                f"supported since Win10 anniversary update. Expect "
+                f"weird symbols on the terminal.\nError: {exc}\n"
+            )
+            sys.stderr.flush()
+
+    try:
+        websocket = connect(args.uri)
+    except Exception as exc:
+        print(f"Failed to connect to {args.uri}: {exc}.")
+        sys.exit(1)
+    else:
+        print(f"Connected to {args.uri}.")
+
+    stop = threading.Event()
+
+    # Start the thread that reads messages from the connection.
+    thread = threading.Thread(target=print_incoming_messages, args=(websocket, stop))
+    thread.start()
+
+    # Read from stdin in the main thread in order to receive signals.
+    try:
+        while True:
+            # Since there's no size limit, put_nowait is identical to put.
+            message = input("> ")
+            websocket.send(message)
+    except (KeyboardInterrupt, EOFError):  # ^C, ^D
+        stop.set()
+        websocket.close()
+        print_over_input("Connection closed.")
+
+    thread.join()
+
+
+if __name__ == "__main__":
+    main()

code/.venv/lib/python3.12/site-packages/websockets/auth.py

@@ -0,0 +1,6 @@
+from __future__ import annotations
+
+# See #940 for why lazy_import isn't used here for backwards compatibility.
+# See #1400 for why listing compatibility imports in __all__ helps PyCharm.
+from .legacy.auth import *
+from .legacy.auth import __all__  # noqa: F401

code/.venv/lib/python3.12/site-packages/websockets/client.py

@@ -0,0 +1,360 @@
+from __future__ import annotations
+
+import warnings
+from typing import Any, Generator, List, Optional, Sequence
+
+from .datastructures import Headers, MultipleValuesError
+from .exceptions import (
+    InvalidHandshake,
+    InvalidHeader,
+    InvalidHeaderValue,
+    InvalidStatus,
+    InvalidUpgrade,
+    NegotiationError,
+)
+from .extensions import ClientExtensionFactory, Extension
+from .headers import (
+    build_authorization_basic,
+    build_extension,
+    build_host,
+    build_subprotocol,
+    parse_connection,
+    parse_extension,
+    parse_subprotocol,
+    parse_upgrade,
+)
+from .http11 import Request, Response
+from .protocol import CLIENT, CONNECTING, OPEN, Protocol, State
+from .typing import (
+    ConnectionOption,
+    ExtensionHeader,
+    LoggerLike,
+    Origin,
+    Subprotocol,
+    UpgradeProtocol,
+)
+from .uri import WebSocketURI
+from .utils import accept_key, generate_key
+
+
+# See #940 for why lazy_import isn't used here for backwards compatibility.
+# See #1400 for why listing compatibility imports in __all__ helps PyCharm.
+from .legacy.client import *  # isort:skip  # noqa: I001
+from .legacy.client import __all__ as legacy__all__
+
+
+__all__ = ["ClientProtocol"] + legacy__all__
+
+
+class ClientProtocol(Protocol):
+    """
+    Sans-I/O implementation of a WebSocket client connection.
+
+    Args:
+        wsuri: URI of the WebSocket server, parsed
+            with :func:`~websockets.uri.parse_uri`.
+        origin: value of the ``Origin`` header. This is useful when connecting
+            to a server that validates the ``Origin`` header to defend against
+            Cross-Site WebSocket Hijacking attacks.
+        extensions: list of supported extensions, in order in which they
+            should be tried.
+        subprotocols: list of supported subprotocols, in order of decreasing
+            preference.
+        state: initial state of the WebSocket connection.
+        max_size: maximum size of incoming messages in bytes;
+            :obj:`None` disables the limit.
+        logger: logger for this connection;
+            defaults to ``logging.getLogger("websockets.client")``;
+            see the :doc:`logging guide <../../topics/logging>` for details.
+
+    """
+
+    def __init__(
+        self,
+        wsuri: WebSocketURI,
+        *,
+        origin: Optional[Origin] = None,
+        extensions: Optional[Sequence[ClientExtensionFactory]] = None,
+        subprotocols: Optional[Sequence[Subprotocol]] = None,
+        state: State = CONNECTING,
+        max_size: Optional[int] = 2**20,
+        logger: Optional[LoggerLike] = None,
+    ):
+        super().__init__(
+            side=CLIENT,
+            state=state,
+            max_size=max_size,
+            logger=logger,
+        )
+        self.wsuri = wsuri
+        self.origin = origin
+        self.available_extensions = extensions
+        self.available_subprotocols = subprotocols
+        self.key = generate_key()
+
+    def connect(self) -> Request:
+        """
+        Create a handshake request to open a connection.
+
+        You must send the handshake request with :meth:`send_request`.
+
+        You can modify it before sending it, for example to add HTTP headers.
+
+        Returns:
+            Request: WebSocket handshake request event to send to the server.
+
+        """
+        headers = Headers()
+
+        headers["Host"] = build_host(
+            self.wsuri.host, self.wsuri.port, self.wsuri.secure
+        )
+
+        if self.wsuri.user_info:
+            headers["Authorization"] = build_authorization_basic(*self.wsuri.user_info)
+
+        if self.origin is not None:
+            headers["Origin"] = self.origin
+
+        headers["Upgrade"] = "websocket"
+        headers["Connection"] = "Upgrade"
+        headers["Sec-WebSocket-Key"] = self.key
+        headers["Sec-WebSocket-Version"] = "13"
+
+        if self.available_extensions is not None:
+            extensions_header = build_extension(
+                [
+                    (extension_factory.name, extension_factory.get_request_params())
+                    for extension_factory in self.available_extensions
+                ]
+            )
+            headers["Sec-WebSocket-Extensions"] = extensions_header
+
+        if self.available_subprotocols is not None:
+            protocol_header = build_subprotocol(self.available_subprotocols)
+            headers["Sec-WebSocket-Protocol"] = protocol_header
+
+        return Request(self.wsuri.resource_name, headers)
+
+    def process_response(self, response: Response) -> None:
+        """
+        Check a handshake response.
+
+        Args:
+            request: WebSocket handshake response received from the server.
+
+        Raises:
+            InvalidHandshake: if the handshake response is invalid.
+
+        """
+
+        if response.status_code != 101:
+            raise InvalidStatus(response)
+
+        headers = response.headers
+
+        connection: List[ConnectionOption] = sum(
+            [parse_connection(value) for value in headers.get_all("Connection")], []
+        )
+
+        if not any(value.lower() == "upgrade" for value in connection):
+            raise InvalidUpgrade(
+                "Connection", ", ".join(connection) if connection else None
+            )
+
+        upgrade: List[UpgradeProtocol] = sum(
+            [parse_upgrade(value) for value in headers.get_all("Upgrade")], []
+        )
+
+        # For compatibility with non-strict implementations, ignore case when
+        # checking the Upgrade header. It's supposed to be 'WebSocket'.
+        if not (len(upgrade) == 1 and upgrade[0].lower() == "websocket"):
+            raise InvalidUpgrade("Upgrade", ", ".join(upgrade) if upgrade else None)
+
+        try:
+            s_w_accept = headers["Sec-WebSocket-Accept"]
+        except KeyError as exc:
+            raise InvalidHeader("Sec-WebSocket-Accept") from exc
+        except MultipleValuesError as exc:
+            raise InvalidHeader(
+                "Sec-WebSocket-Accept",
+                "more than one Sec-WebSocket-Accept header found",
+            ) from exc
+
+        if s_w_accept != accept_key(self.key):
+            raise InvalidHeaderValue("Sec-WebSocket-Accept", s_w_accept)
+
+        self.extensions = self.process_extensions(headers)
+
+        self.subprotocol = self.process_subprotocol(headers)
+
+    def process_extensions(self, headers: Headers) -> List[Extension]:
+        """
+        Handle the Sec-WebSocket-Extensions HTTP response header.
+
+        Check that each extension is supported, as well as its parameters.
+
+        :rfc:`6455` leaves the rules up to the specification of each
+        extension.
+
+        To provide this level of flexibility, for each extension accepted by
+        the server, we check for a match with each extension available in the
+        client configuration. If no match is found, an exception is raised.
+
+        If several variants of the same extension are accepted by the server,
+        it may be configured several times, which won't make sense in general.
+        Extensions must implement their own requirements. For this purpose,
+        the list of previously accepted extensions is provided.
+
+        Other requirements, for example related to mandatory extensions or the
+        order of extensions, may be implemented by overriding this method.
+
+        Args:
+            headers: WebSocket handshake response headers.
+
+        Returns:
+            List[Extension]: List of accepted extensions.
+
+        Raises:
+            InvalidHandshake: to abort the handshake.
+
+        """
+        accepted_extensions: List[Extension] = []
+
+        extensions = headers.get_all("Sec-WebSocket-Extensions")
+
+        if extensions:
+            if self.available_extensions is None:
+                raise InvalidHandshake("no extensions supported")
+
+            parsed_extensions: List[ExtensionHeader] = sum(
+                [parse_extension(header_value) for header_value in extensions], []
+            )
+
+            for name, response_params in parsed_extensions:
+                for extension_factory in self.available_extensions:
+                    # Skip non-matching extensions based on their name.
+                    if extension_factory.name != name:
+                        continue
+
+                    # Skip non-matching extensions based on their params.
+                    try:
+                        extension = extension_factory.process_response_params(
+                            response_params, accepted_extensions
+                        )
+                    except NegotiationError:
+                        continue
+
+                    # Add matching extension to the final list.
+                    accepted_extensions.append(extension)
+
+                    # Break out of the loop once we have a match.
+                    break
+
+                # If we didn't break from the loop, no extension in our list
+                # matched what the server sent. Fail the connection.
+                else:
+                    raise NegotiationError(
+                        f"Unsupported extension: "
+                        f"name = {name}, params = {response_params}"
+                    )
+
+        return accepted_extensions
+
+    def process_subprotocol(self, headers: Headers) -> Optional[Subprotocol]:
+        """
+        Handle the Sec-WebSocket-Protocol HTTP response header.
+
+        If provided, check that it contains exactly one supported subprotocol.
+
+        Args:
+            headers: WebSocket handshake response headers.
+
+        Returns:
+           Optional[Subprotocol]: Subprotocol, if one was selected.
+
+        """
+        subprotocol: Optional[Subprotocol] = None
+
+        subprotocols = headers.get_all("Sec-WebSocket-Protocol")
+
+        if subprotocols:
+            if self.available_subprotocols is None:
+                raise InvalidHandshake("no subprotocols supported")
+
+            parsed_subprotocols: Sequence[Subprotocol] = sum(
+                [parse_subprotocol(header_value) for header_value in subprotocols], []
+            )
+
+            if len(parsed_subprotocols) > 1:
+                subprotocols_display = ", ".join(parsed_subprotocols)
+                raise InvalidHandshake(f"multiple subprotocols: {subprotocols_display}")
+
+            subprotocol = parsed_subprotocols[0]
+
+            if subprotocol not in self.available_subprotocols:
+                raise NegotiationError(f"unsupported subprotocol: {subprotocol}")
+
+        return subprotocol
+
+    def send_request(self, request: Request) -> None:
+        """
+        Send a handshake request to the server.
+
+        Args:
+            request: WebSocket handshake request event.
+
+        """
+        if self.debug:
+            self.logger.debug("> GET %s HTTP/1.1", request.path)
+            for key, value in request.headers.raw_items():
+                self.logger.debug("> %s: %s", key, value)
+
+        self.writes.append(request.serialize())
+
+    def parse(self) -> Generator[None, None, None]:
+        if self.state is CONNECTING:
+            try:
+                response = yield from Response.parse(
+                    self.reader.read_line,
+                    self.reader.read_exact,
+                    self.reader.read_to_eof,
+                )
+            except Exception as exc:
+                self.handshake_exc = exc
+                self.parser = self.discard()
+                next(self.parser)  # start coroutine
+                yield
+
+            if self.debug:
+                code, phrase = response.status_code, response.reason_phrase
+                self.logger.debug("< HTTP/1.1 %d %s", code, phrase)
+                for key, value in response.headers.raw_items():
+                    self.logger.debug("< %s: %s", key, value)
+                if response.body is not None:
+                    self.logger.debug("< [body] (%d bytes)", len(response.body))
+
+            try:
+                self.process_response(response)
+            except InvalidHandshake as exc:
+                response._exception = exc
+                self.events.append(response)
+                self.handshake_exc = exc
+                self.parser = self.discard()
+                next(self.parser)  # start coroutine
+                yield
+
+            assert self.state is CONNECTING
+            self.state = OPEN
+            self.events.append(response)
+
+        yield from super().parse()
+
+
+class ClientConnection(ClientProtocol):
+    def __init__(self, *args: Any, **kwargs: Any) -> None:
+        warnings.warn(
+            "ClientConnection was renamed to ClientProtocol",
+            DeprecationWarning,
+        )
+        super().__init__(*args, **kwargs)

code/.venv/lib/python3.12/site-packages/websockets/connection.py

@@ -0,0 +1,13 @@
+from __future__ import annotations
+
+import warnings
+
+# lazy_import doesn't support this use case.
+from .protocol import SEND_EOF, Protocol as Connection, Side, State  # noqa: F401
+
+
+warnings.warn(
+    "websockets.connection was renamed to websockets.protocol "
+    "and Connection was renamed to Protocol",
+    DeprecationWarning,
+)

code/.venv/lib/python3.12/site-packages/websockets/datastructures.py

@@ -0,0 +1,194 @@
+from __future__ import annotations
+
+from typing import (
+    Any,
+    Dict,
+    Iterable,
+    Iterator,
+    List,
+    Mapping,
+    MutableMapping,
+    Protocol,
+    Tuple,
+    Union,
+)
+
+
+__all__ = ["Headers", "HeadersLike", "MultipleValuesError"]
+
+
+class MultipleValuesError(LookupError):
+    """
+    Exception raised when :class:`Headers` has more than one value for a key.
+
+    """
+
+    def __str__(self) -> str:
+        # Implement the same logic as KeyError_str in Objects/exceptions.c.
+        if len(self.args) == 1:
+            return repr(self.args[0])
+        return super().__str__()
+
+
+class Headers(MutableMapping[str, str]):
+    """
+    Efficient data structure for manipulating HTTP headers.
+
+    A :class:`list` of ``(name, values)`` is inefficient for lookups.
+
+    A :class:`dict` doesn't suffice because header names are case-insensitive
+    and multiple occurrences of headers with the same name are possible.
+
+    :class:`Headers` stores HTTP headers in a hybrid data structure to provide
+    efficient insertions and lookups while preserving the original data.
+
+    In order to account for multiple values with minimal hassle,
+    :class:`Headers` follows this logic:
+
+    - When getting a header with ``headers[name]``:
+        - if there's no value, :exc:`KeyError` is raised;
+        - if there's exactly one value, it's returned;
+        - if there's more than one value, :exc:`MultipleValuesError` is raised.
+
+    - When setting a header with ``headers[name] = value``, the value is
+      appended to the list of values for that header.
+
+    - When deleting a header with ``del headers[name]``, all values for that
+      header are removed (this is slow).
+
+    Other methods for manipulating headers are consistent with this logic.
+
+    As long as no header occurs multiple times, :class:`Headers` behaves like
+    :class:`dict`, except keys are lower-cased to provide case-insensitivity.
+
+    Two methods support manipulating multiple values explicitly:
+
+    - :meth:`get_all` returns a list of all values for a header;
+    - :meth:`raw_items` returns an iterator of ``(name, values)`` pairs.
+
+    """
+
+    __slots__ = ["_dict", "_list"]
+
+    # Like dict, Headers accepts an optional "mapping or iterable" argument.
+    def __init__(self, *args: HeadersLike, **kwargs: str) -> None:
+        self._dict: Dict[str, List[str]] = {}
+        self._list: List[Tuple[str, str]] = []
+        self.update(*args, **kwargs)
+
+    def __str__(self) -> str:
+        return "".join(f"{key}: {value}\r\n" for key, value in self._list) + "\r\n"
+
+    def __repr__(self) -> str:
+        return f"{self.__class__.__name__}({self._list!r})"
+
+    def copy(self) -> Headers:
+        copy = self.__class__()
+        copy._dict = self._dict.copy()
+        copy._list = self._list.copy()
+        return copy
+
+    def serialize(self) -> bytes:
+        # Since headers only contain ASCII characters, we can keep this simple.
+        return str(self).encode()
+
+    # Collection methods
+
+    def __contains__(self, key: object) -> bool:
+        return isinstance(key, str) and key.lower() in self._dict
+
+    def __iter__(self) -> Iterator[str]:
+        return iter(self._dict)
+
+    def __len__(self) -> int:
+        return len(self._dict)
+
+    # MutableMapping methods
+
+    def __getitem__(self, key: str) -> str:
+        value = self._dict[key.lower()]
+        if len(value) == 1:
+            return value[0]
+        else:
+            raise MultipleValuesError(key)
+
+    def __setitem__(self, key: str, value: str) -> None:
+        self._dict.setdefault(key.lower(), []).append(value)
+        self._list.append((key, value))
+
+    def __delitem__(self, key: str) -> None:
+        key_lower = key.lower()
+        self._dict.__delitem__(key_lower)
+        # This is inefficient. Fortunately deleting HTTP headers is uncommon.
+        self._list = [(k, v) for k, v in self._list if k.lower() != key_lower]
+
+    def __eq__(self, other: Any) -> bool:
+        if not isinstance(other, Headers):
+            return NotImplemented
+        return self._dict == other._dict
+
+    def clear(self) -> None:
+        """
+        Remove all headers.
+
+        """
+        self._dict = {}
+        self._list = []
+
+    def update(self, *args: HeadersLike, **kwargs: str) -> None:
+        """
+        Update from a :class:`Headers` instance and/or keyword arguments.
+
+        """
+        args = tuple(
+            arg.raw_items() if isinstance(arg, Headers) else arg for arg in args
+        )
+        super().update(*args, **kwargs)
+
+    # Methods for handling multiple values
+
+    def get_all(self, key: str) -> List[str]:
+        """
+        Return the (possibly empty) list of all values for a header.
+
+        Args:
+            key: header name.
+
+        """
+        return self._dict.get(key.lower(), [])
+
+    def raw_items(self) -> Iterator[Tuple[str, str]]:
+        """
+        Return an iterator of all values as ``(name, value)`` pairs.
+
+        """
+        return iter(self._list)
+
+
+# copy of _typeshed.SupportsKeysAndGetItem.
+class SupportsKeysAndGetItem(Protocol):  # pragma: no cover
+    """
+    Dict-like types with ``keys() -> str`` and ``__getitem__(key: str) -> str`` methods.
+
+    """
+
+    def keys(self) -> Iterable[str]:
+        ...
+
+    def __getitem__(self, key: str) -> str:
+        ...
+
+
+HeadersLike = Union[
+    Headers,
+    Mapping[str, str],
+    Iterable[Tuple[str, str]],
+    SupportsKeysAndGetItem,
+]
+"""
+Types accepted where :class:`Headers` is expected.
+
+In addition to :class:`Headers` itself, this includes dict-like types where both
+keys and values are :class:`str`.
+
+"""

code/.venv/lib/python3.12/site-packages/websockets/exceptions.py

@@ -0,0 +1,405 @@
+"""
+:mod:`websockets.exceptions` defines the following exception hierarchy:
+
+* :exc:`WebSocketException`
+    * :exc:`ConnectionClosed`
+        * :exc:`ConnectionClosedError`
+        * :exc:`ConnectionClosedOK`
+    * :exc:`InvalidHandshake`
+        * :exc:`SecurityError`
+        * :exc:`InvalidMessage`
+        * :exc:`InvalidHeader`
+            * :exc:`InvalidHeaderFormat`
+            * :exc:`InvalidHeaderValue`
+            * :exc:`InvalidOrigin`
+            * :exc:`InvalidUpgrade`
+        * :exc:`InvalidStatus`
+        * :exc:`InvalidStatusCode` (legacy)
+        * :exc:`NegotiationError`
+            * :exc:`DuplicateParameter`
+            * :exc:`InvalidParameterName`
+            * :exc:`InvalidParameterValue`
+        * :exc:`AbortHandshake`
+        * :exc:`RedirectHandshake`
+    * :exc:`InvalidState`
+    * :exc:`InvalidURI`
+    * :exc:`PayloadTooBig`
+    * :exc:`ProtocolError`
+
+"""
+
+from __future__ import annotations
+
+import http
+from typing import Optional
+
+from . import datastructures, frames, http11
+from .typing import StatusLike
+
+
+__all__ = [
+    "WebSocketException",
+    "ConnectionClosed",
+    "ConnectionClosedError",
+    "ConnectionClosedOK",
+    "InvalidHandshake",
+    "SecurityError",
+    "InvalidMessage",
+    "InvalidHeader",
+    "InvalidHeaderFormat",
+    "InvalidHeaderValue",
+    "InvalidOrigin",
+    "InvalidUpgrade",
+    "InvalidStatus",
+    "InvalidStatusCode",
+    "NegotiationError",
+    "DuplicateParameter",
+    "InvalidParameterName",
+    "InvalidParameterValue",
+    "AbortHandshake",
+    "RedirectHandshake",
+    "InvalidState",
+    "InvalidURI",
+    "PayloadTooBig",
+    "ProtocolError",
+    "WebSocketProtocolError",
+]
+
+
+class WebSocketException(Exception):
+    """
+    Base class for all exceptions defined by websockets.
+
+    """
+
+
+class ConnectionClosed(WebSocketException):
+    """
+    Raised when trying to interact with a closed connection.
+
+    Attributes:
+        rcvd (Optional[Close]): if a close frame was received, its code and
+            reason are available in ``rcvd.code`` and ``rcvd.reason``.
+        sent (Optional[Close]): if a close frame was sent, its code and reason
+            are available in ``sent.code`` and ``sent.reason``.
+        rcvd_then_sent (Optional[bool]): if close frames were received and
+            sent, this attribute tells in which order this happened, from the
+            perspective of this side of the connection.
+
+    """
+
+    def __init__(
+        self,
+        rcvd: Optional[frames.Close],
+        sent: Optional[frames.Close],
+        rcvd_then_sent: Optional[bool] = None,
+    ) -> None:
+        self.rcvd = rcvd
+        self.sent = sent
+        self.rcvd_then_sent = rcvd_then_sent
+
+    def __str__(self) -> str:
+        if self.rcvd is None:
+            if self.sent is None:
+                assert self.rcvd_then_sent is None
+                return "no close frame received or sent"
+            else:
+                assert self.rcvd_then_sent is None
+                return f"sent {self.sent}; no close frame received"
+        else:
+            if self.sent is None:
+                assert self.rcvd_then_sent is None
+                return f"received {self.rcvd}; no close frame sent"
+            else:
+                assert self.rcvd_then_sent is not None
+                if self.rcvd_then_sent:
+                    return f"received {self.rcvd}; then sent {self.sent}"
+                else:
+                    return f"sent {self.sent}; then received {self.rcvd}"
+
+    # code and reason attributes are provided for backwards-compatibility
+
+    @property
+    def code(self) -> int:
+        if self.rcvd is None:
+            return frames.CloseCode.ABNORMAL_CLOSURE
+        return self.rcvd.code
+
+    @property
+    def reason(self) -> str:
+        if self.rcvd is None:
+            return ""
+        return self.rcvd.reason
+
+
+class ConnectionClosedError(ConnectionClosed):
+    """
+    Like :exc:`ConnectionClosed`, when the connection terminated with an error.
+
+    A close frame with a code other than 1000 (OK) or 1001 (going away) was
+    received or sent, or the closing handshake didn't complete properly.
+
+    """
+
+
+class ConnectionClosedOK(ConnectionClosed):
+    """
+    Like :exc:`ConnectionClosed`, when the connection terminated properly.
+
+    A close code with code 1000 (OK) or 1001 (going away) or without a code was
+    received and sent.
+
+    """
+
+
+class InvalidHandshake(WebSocketException):
+    """
+    Raised during the handshake when the WebSocket connection fails.
+
+    """
+
+
+class SecurityError(InvalidHandshake):
+    """
+    Raised when a handshake request or response breaks a security rule.
+
+    Security limits are hard coded.
+
+    """
+
+
+class InvalidMessage(InvalidHandshake):
+    """
+    Raised when a handshake request or response is malformed.
+
+    """
+
+
+class InvalidHeader(InvalidHandshake):
+    """
+    Raised when an HTTP header doesn't have a valid format or value.
+
+    """
+
+    def __init__(self, name: str, value: Optional[str] = None) -> None:
+        self.name = name
+        self.value = value
+
+    def __str__(self) -> str:
+        if self.value is None:
+            return f"missing {self.name} header"
+        elif self.value == "":
+            return f"empty {self.name} header"
+        else:
+            return f"invalid {self.name} header: {self.value}"
+
+
+class InvalidHeaderFormat(InvalidHeader):
+    """
+    Raised when an HTTP header cannot be parsed.
+
+    The format of the header doesn't match the grammar for that header.
+
+    """
+
+    def __init__(self, name: str, error: str, header: str, pos: int) -> None:
+        super().__init__(name, f"{error} at {pos} in {header}")
+
+
+class InvalidHeaderValue(InvalidHeader):
+    """
+    Raised when an HTTP header has a wrong value.
+
+    The format of the header is correct but a value isn't acceptable.
+
+    """
+
+
+class InvalidOrigin(InvalidHeader):
+    """
+    Raised when the Origin header in a request isn't allowed.
+
+    """
+
+    def __init__(self, origin: Optional[str]) -> None:
+        super().__init__("Origin", origin)
+
+
+class InvalidUpgrade(InvalidHeader):
+    """
+    Raised when the Upgrade or Connection header isn't correct.
+
+    """
+
+
+class InvalidStatus(InvalidHandshake):
+    """
+    Raised when a handshake response rejects the WebSocket upgrade.
+
+    """
+
+    def __init__(self, response: http11.Response) -> None:
+        self.response = response
+
+    def __str__(self) -> str:
+        return (
+            "server rejected WebSocket connection: "
+            f"HTTP {self.response.status_code:d}"
+        )
+
+
+class InvalidStatusCode(InvalidHandshake):
+    """
+    Raised when a handshake response status code is invalid.
+
+    """
+
+    def __init__(self, status_code: int, headers: datastructures.Headers) -> None:
+        self.status_code = status_code
+        self.headers = headers
+
+    def __str__(self) -> str:
+        return f"server rejected WebSocket connection: HTTP {self.status_code}"
+
+
+class NegotiationError(InvalidHandshake):
+    """
+    Raised when negotiating an extension fails.
+
+    """
+
+
+class DuplicateParameter(NegotiationError):
+    """
+    Raised when a parameter name is repeated in an extension header.
+
+    """
+
+    def __init__(self, name: str) -> None:
+        self.name = name
+
+    def __str__(self) -> str:
+        return f"duplicate parameter: {self.name}"
+
+
+class InvalidParameterName(NegotiationError):
+    """
+    Raised when a parameter name in an extension header is invalid.
+
+    """
+
+    def __init__(self, name: str) -> None:
+        self.name = name
+
+    def __str__(self) -> str:
+        return f"invalid parameter name: {self.name}"
+
+
+class InvalidParameterValue(NegotiationError):
+    """
+    Raised when a parameter value in an extension header is invalid.
+
+    """
+
+    def __init__(self, name: str, value: Optional[str]) -> None:
+        self.name = name
+        self.value = value
+
+    def __str__(self) -> str:
+        if self.value is None:
+            return f"missing value for parameter {self.name}"
+        elif self.value == "":
+            return f"empty value for parameter {self.name}"
+        else:
+            return f"invalid value for parameter {self.name}: {self.value}"
+
+
+class AbortHandshake(InvalidHandshake):
+    """
+    Raised to abort the handshake on purpose and return an HTTP response.
+
+    This exception is an implementation detail.
+
+    The public API
+    is :meth:`~websockets.server.WebSocketServerProtocol.process_request`.
+
+    Attributes:
+        status (~http.HTTPStatus): HTTP status code.
+        headers (Headers): HTTP response headers.
+        body (bytes): HTTP response body.
+    """
+
+    def __init__(
+        self,
+        status: StatusLike,
+        headers: datastructures.HeadersLike,
+        body: bytes = b"",
+    ) -> None:
+        # If a user passes an int instead of a HTTPStatus, fix it automatically.
+        self.status = http.HTTPStatus(status)
+        self.headers = datastructures.Headers(headers)
+        self.body = body
+
+    def __str__(self) -> str:
+        return (
+            f"HTTP {self.status:d}, "
+            f"{len(self.headers)} headers, "
+            f"{len(self.body)} bytes"
+        )
+
+
+class RedirectHandshake(InvalidHandshake):
+    """
+    Raised when a handshake gets redirected.
+
+    This exception is an implementation detail.
+
+    """
+
+    def __init__(self, uri: str) -> None:
+        self.uri = uri
+
+    def __str__(self) -> str:
+        return f"redirect to {self.uri}"
+
+
+class InvalidState(WebSocketException, AssertionError):
+    """
+    Raised when an operation is forbidden in the current state.
+
+    This exception is an implementation detail.
+
+    It should never be raised in normal circumstances.
+
+    """
+
+
+class InvalidURI(WebSocketException):
+    """
+    Raised when connecting to a URI that isn't a valid WebSocket URI.
+
+    """
+
+    def __init__(self, uri: str, msg: str) -> None:
+        self.uri = uri
+        self.msg = msg
+
+    def __str__(self) -> str:
+        return f"{self.uri} isn't a valid URI: {self.msg}"
+
+
+class PayloadTooBig(WebSocketException):
+    """
+    Raised when receiving a frame with a payload exceeding the maximum size.
+
+    """
+
+
+class ProtocolError(WebSocketException):
+    """
+    Raised when a frame breaks the protocol.
+
+    """
+
+
+WebSocketProtocolError = ProtocolError  # for backwards compatibility

code/.venv/lib/python3.12/site-packages/websockets/extensions/__init__.py

@@ -0,0 +1,4 @@
+from .base import *
+
+
+__all__ = ["Extension", "ClientExtensionFactory", "ServerExtensionFactory"]

code/.venv/lib/python3.12/site-packages/websockets/extensions/base.py

@@ -0,0 +1,133 @@
+from __future__ import annotations
+
+from typing import List, Optional, Sequence, Tuple
+
+from .. import frames
+from ..typing import ExtensionName, ExtensionParameter
+
+
+__all__ = ["Extension", "ClientExtensionFactory", "ServerExtensionFactory"]
+
+
+class Extension:
+    """
+    Base class for extensions.
+
+    """
+
+    name: ExtensionName
+    """Extension identifier."""
+
+    def decode(
+        self,
+        frame: frames.Frame,
+        *,
+        max_size: Optional[int] = None,
+    ) -> frames.Frame:
+        """
+        Decode an incoming frame.
+
+        Args:
+            frame (Frame): incoming frame.
+            max_size: maximum payload size in bytes.
+
+        Returns:
+            Frame: Decoded frame.
+
+        Raises:
+            PayloadTooBig: if decoding the payload exceeds ``max_size``.
+
+        """
+        raise NotImplementedError
+
+    def encode(self, frame: frames.Frame) -> frames.Frame:
+        """
+        Encode an outgoing frame.
+
+        Args:
+            frame (Frame): outgoing frame.
+
+        Returns:
+            Frame: Encoded frame.
+
+        """
+        raise NotImplementedError
+
+
+class ClientExtensionFactory:
+    """
+    Base class for client-side extension factories.
+
+    """
+
+    name: ExtensionName
+    """Extension identifier."""
+
+    def get_request_params(self) -> List[ExtensionParameter]:
+        """
+        Build parameters to send to the server for this extension.
+
+        Returns:
+            List[ExtensionParameter]: Parameters to send to the server.
+
+        """
+        raise NotImplementedError
+
+    def process_response_params(
+        self,
+        params: Sequence[ExtensionParameter],
+        accepted_extensions: Sequence[Extension],
+    ) -> Extension:
+        """
+        Process parameters received from the server.
+
+        Args:
+            params (Sequence[ExtensionParameter]): parameters received from
+                the server for this extension.
+            accepted_extensions (Sequence[Extension]): list of previously
+                accepted extensions.
+
+        Returns:
+            Extension: An extension instance.
+
+        Raises:
+            NegotiationError: if parameters aren't acceptable.
+
+        """
+        raise NotImplementedError
+
+
+class ServerExtensionFactory:
+    """
+    Base class for server-side extension factories.
+
+    """
+
+    name: ExtensionName
+    """Extension identifier."""
+
+    def process_request_params(
+        self,
+        params: Sequence[ExtensionParameter],
+        accepted_extensions: Sequence[Extension],
+    ) -> Tuple[List[ExtensionParameter], Extension]:
+        """
+        Process parameters received from the client.
+
+        Args:
+            params (Sequence[ExtensionParameter]): parameters received from
+                the client for this extension.
+            accepted_extensions (Sequence[Extension]): list of previously
+                accepted extensions.
+
+        Returns:
+            Tuple[List[ExtensionParameter], Extension]: To accept the offer,
+            parameters to send to the client for this extension and an
+            extension instance.
+
+        Raises:
+            NegotiationError: to reject the offer, if parameters received from
+                the client aren't acceptable.
+
+        """
+        raise NotImplementedError

code/.venv/lib/python3.12/site-packages/websockets/extensions/permessage_deflate.py

@@ -0,0 +1,660 @@
+from __future__ import annotations
+
+import dataclasses
+import zlib
+from typing import Any, Dict, List, Optional, Sequence, Tuple, Union
+
+from .. import exceptions, frames
+from ..typing import ExtensionName, ExtensionParameter
+from .base import ClientExtensionFactory, Extension, ServerExtensionFactory
+
+
+__all__ = [
+    "PerMessageDeflate",
+    "ClientPerMessageDeflateFactory",
+    "enable_client_permessage_deflate",
+    "ServerPerMessageDeflateFactory",
+    "enable_server_permessage_deflate",
+]
+
+_EMPTY_UNCOMPRESSED_BLOCK = b"\x00\x00\xff\xff"
+
+_MAX_WINDOW_BITS_VALUES = [str(bits) for bits in range(8, 16)]
+
+
+class PerMessageDeflate(Extension):
+    """
+    Per-Message Deflate extension.
+
+    """
+
+    name = ExtensionName("permessage-deflate")
+
+    def __init__(
+        self,
+        remote_no_context_takeover: bool,
+        local_no_context_takeover: bool,
+        remote_max_window_bits: int,
+        local_max_window_bits: int,
+        compress_settings: Optional[Dict[Any, Any]] = None,
+    ) -> None:
+        """
+        Configure the Per-Message Deflate extension.
+
+        """
+        if compress_settings is None:
+            compress_settings = {}
+
+        assert remote_no_context_takeover in [False, True]
+        assert local_no_context_takeover in [False, True]
+        assert 8 <= remote_max_window_bits <= 15
+        assert 8 <= local_max_window_bits <= 15
+        assert "wbits" not in compress_settings
+
+        self.remote_no_context_takeover = remote_no_context_takeover
+        self.local_no_context_takeover = local_no_context_takeover
+        self.remote_max_window_bits = remote_max_window_bits
+        self.local_max_window_bits = local_max_window_bits
+        self.compress_settings = compress_settings
+
+        if not self.remote_no_context_takeover:
+            self.decoder = zlib.decompressobj(wbits=-self.remote_max_window_bits)
+
+        if not self.local_no_context_takeover:
+            self.encoder = zlib.compressobj(
+                wbits=-self.local_max_window_bits, **self.compress_settings
+            )
+
+        # To handle continuation frames properly, we must keep track of
+        # whether that initial frame was encoded.
+        self.decode_cont_data = False
+        # There's no need for self.encode_cont_data because we always encode
+        # outgoing frames, so it would always be True.
+
+    def __repr__(self) -> str:
+        return (
+            f"PerMessageDeflate("
+            f"remote_no_context_takeover={self.remote_no_context_takeover}, "
+            f"local_no_context_takeover={self.local_no_context_takeover}, "
+            f"remote_max_window_bits={self.remote_max_window_bits}, "
+            f"local_max_window_bits={self.local_max_window_bits})"
+        )
+
+    def decode(
+        self,
+        frame: frames.Frame,
+        *,
+        max_size: Optional[int] = None,
+    ) -> frames.Frame:
+        """
+        Decode an incoming frame.
+
+        """
+        # Skip control frames.
+        if frame.opcode in frames.CTRL_OPCODES:
+            return frame
+
+        # Handle continuation data frames:
+        # - skip if the message isn't encoded
+        # - reset "decode continuation data" flag if it's a final frame
+        if frame.opcode is frames.OP_CONT:
+            if not self.decode_cont_data:
+                return frame
+            if frame.fin:
+                self.decode_cont_data = False
+
+        # Handle text and binary data frames:
+        # - skip if the message isn't encoded
+        # - unset the rsv1 flag on the first frame of a compressed message
+        # - set "decode continuation data" flag if it's a non-final frame
+        else:
+            if not frame.rsv1:
+                return frame
+            frame = dataclasses.replace(frame, rsv1=False)
+            if not frame.fin:
+                self.decode_cont_data = True
+
+            # Re-initialize per-message decoder.
+            if self.remote_no_context_takeover:
+                self.decoder = zlib.decompressobj(wbits=-self.remote_max_window_bits)
+
+        # Uncompress data. Protect against zip bombs by preventing zlib from
+        # decompressing more than max_length bytes (except when the limit is
+        # disabled with max_size = None).
+        data = frame.data
+        if frame.fin:
+            data += _EMPTY_UNCOMPRESSED_BLOCK
+        max_length = 0 if max_size is None else max_size
+        try:
+            data = self.decoder.decompress(data, max_length)
+        except zlib.error as exc:
+            raise exceptions.ProtocolError("decompression failed") from exc
+        if self.decoder.unconsumed_tail:
+            raise exceptions.PayloadTooBig(f"over size limit (? > {max_size} bytes)")
+
+        # Allow garbage collection of the decoder if it won't be reused.
+        if frame.fin and self.remote_no_context_takeover:
+            del self.decoder
+
+        return dataclasses.replace(frame, data=data)
+
+    def encode(self, frame: frames.Frame) -> frames.Frame:
+        """
+        Encode an outgoing frame.
+
+        """
+        # Skip control frames.
+        if frame.opcode in frames.CTRL_OPCODES:
+            return frame
+
+        # Since we always encode messages, there's no "encode continuation
+        # data" flag similar to "decode continuation data" at this time.
+
+        if frame.opcode is not frames.OP_CONT:
+            # Set the rsv1 flag on the first frame of a compressed message.
+            frame = dataclasses.replace(frame, rsv1=True)
+            # Re-initialize per-message decoder.
+            if self.local_no_context_takeover:
+                self.encoder = zlib.compressobj(
+                    wbits=-self.local_max_window_bits, **self.compress_settings
+                )
+
+        # Compress data.
+        data = self.encoder.compress(frame.data) + self.encoder.flush(zlib.Z_SYNC_FLUSH)
+        if frame.fin and data.endswith(_EMPTY_UNCOMPRESSED_BLOCK):
+            data = data[:-4]
+
+        # Allow garbage collection of the encoder if it won't be reused.
+        if frame.fin and self.local_no_context_takeover:
+            del self.encoder
+
+        return dataclasses.replace(frame, data=data)
+
+
+def _build_parameters(
+    server_no_context_takeover: bool,
+    client_no_context_takeover: bool,
+    server_max_window_bits: Optional[int],
+    client_max_window_bits: Optional[Union[int, bool]],
+) -> List[ExtensionParameter]:
+    """
+    Build a list of ``(name, value)`` pairs for some compression parameters.
+
+    """
+    params: List[ExtensionParameter] = []
+    if server_no_context_takeover:
+        params.append(("server_no_context_takeover", None))
+    if client_no_context_takeover:
+        params.append(("client_no_context_takeover", None))
+    if server_max_window_bits:
+        params.append(("server_max_window_bits", str(server_max_window_bits)))
+    if client_max_window_bits is True:  # only in handshake requests
+        params.append(("client_max_window_bits", None))
+    elif client_max_window_bits:
+        params.append(("client_max_window_bits", str(client_max_window_bits)))
+    return params
+
+
+def _extract_parameters(
+    params: Sequence[ExtensionParameter], *, is_server: bool
+) -> Tuple[bool, bool, Optional[int], Optional[Union[int, bool]]]:
+    """
+    Extract compression parameters from a list of ``(name, value)`` pairs.
+
+    If ``is_server`` is :obj:`True`, ``client_max_window_bits`` may be
+    provided without a value. This is only allowed in handshake requests.
+
+    """
+    server_no_context_takeover: bool = False
+    client_no_context_takeover: bool = False
+    server_max_window_bits: Optional[int] = None
+    client_max_window_bits: Optional[Union[int, bool]] = None
+
+    for name, value in params:
+        if name == "server_no_context_takeover":
+            if server_no_context_takeover:
+                raise exceptions.DuplicateParameter(name)
+            if value is None:
+                server_no_context_takeover = True
+            else:
+                raise exceptions.InvalidParameterValue(name, value)
+
+        elif name == "client_no_context_takeover":
+            if client_no_context_takeover:
+                raise exceptions.DuplicateParameter(name)
+            if value is None:
+                client_no_context_takeover = True
+            else:
+                raise exceptions.InvalidParameterValue(name, value)
+
+        elif name == "server_max_window_bits":
+            if server_max_window_bits is not None:
+                raise exceptions.DuplicateParameter(name)
+            if value in _MAX_WINDOW_BITS_VALUES:
+                server_max_window_bits = int(value)
+            else:
+                raise exceptions.InvalidParameterValue(name, value)
+
+        elif name == "client_max_window_bits":
+            if client_max_window_bits is not None:
+                raise exceptions.DuplicateParameter(name)
+            if is_server and value is None:  # only in handshake requests
+                client_max_window_bits = True
+            elif value in _MAX_WINDOW_BITS_VALUES:
+                client_max_window_bits = int(value)
+            else:
+                raise exceptions.InvalidParameterValue(name, value)
+
+        else:
+            raise exceptions.InvalidParameterName(name)
+
+    return (
+        server_no_context_takeover,
+        client_no_context_takeover,
+        server_max_window_bits,
+        client_max_window_bits,
+    )
+
+
+class ClientPerMessageDeflateFactory(ClientExtensionFactory):
+    """
+    Client-side extension factory for the Per-Message Deflate extension.
+
+    Parameters behave as described in `section 7.1 of RFC 7692`_.
+
+    .. _section 7.1 of RFC 7692: https://www.rfc-editor.org/rfc/rfc7692.html#section-7.1
+
+    Set them to :obj:`True` to include them in the negotiation offer without a
+    value or to an integer value to include them with this value.
+
+    Args:
+        server_no_context_takeover: prevent server from using context takeover.
+        client_no_context_takeover: prevent client from using context takeover.
+        server_max_window_bits: maximum size of the server's LZ77 sliding window
+            in bits, between 8 and 15.
+        client_max_window_bits: maximum size of the client's LZ77 sliding window
+            in bits, between 8 and 15, or :obj:`True` to indicate support without
+            setting a limit.
+        compress_settings: additional keyword arguments for :func:`zlib.compressobj`,
+            excluding ``wbits``.
+
+    """
+
+    name = ExtensionName("permessage-deflate")
+
+    def __init__(
+        self,
+        server_no_context_takeover: bool = False,
+        client_no_context_takeover: bool = False,
+        server_max_window_bits: Optional[int] = None,
+        client_max_window_bits: Optional[Union[int, bool]] = True,
+        compress_settings: Optional[Dict[str, Any]] = None,
+    ) -> None:
+        """
+        Configure the Per-Message Deflate extension factory.
+
+        """
+        if not (server_max_window_bits is None or 8 <= server_max_window_bits <= 15):
+            raise ValueError("server_max_window_bits must be between 8 and 15")
+        if not (
+            client_max_window_bits is None
+            or client_max_window_bits is True
+            or 8 <= client_max_window_bits <= 15
+        ):
+            raise ValueError("client_max_window_bits must be between 8 and 15")
+        if compress_settings is not None and "wbits" in compress_settings:
+            raise ValueError(
+                "compress_settings must not include wbits, "
+                "set client_max_window_bits instead"
+            )
+
+        self.server_no_context_takeover = server_no_context_takeover
+        self.client_no_context_takeover = client_no_context_takeover
+        self.server_max_window_bits = server_max_window_bits
+        self.client_max_window_bits = client_max_window_bits
+        self.compress_settings = compress_settings
+
+    def get_request_params(self) -> List[ExtensionParameter]:
+        """
+        Build request parameters.
+
+        """
+        return _build_parameters(
+            self.server_no_context_takeover,
+            self.client_no_context_takeover,
+            self.server_max_window_bits,
+            self.client_max_window_bits,
+        )
+
+    def process_response_params(
+        self,
+        params: Sequence[ExtensionParameter],
+        accepted_extensions: Sequence[Extension],
+    ) -> PerMessageDeflate:
+        """
+        Process response parameters.
+
+        Return an extension instance.
+
+        """
+        if any(other.name == self.name for other in accepted_extensions):
+            raise exceptions.NegotiationError(f"received duplicate {self.name}")
+
+        # Request parameters are available in instance variables.
+
+        # Load response parameters in local variables.
+        (
+            server_no_context_takeover,
+            client_no_context_takeover,
+            server_max_window_bits,
+            client_max_window_bits,
+        ) = _extract_parameters(params, is_server=False)
+
+        # After comparing the request and the response, the final
+        # configuration must be available in the local variables.
+
+        # server_no_context_takeover
+        #
+        #   Req.    Resp.   Result
+        #   ------  ------  --------------------------------------------------
+        #   False   False   False
+        #   False   True    True
+        #   True    False   Error!
+        #   True    True    True
+
+        if self.server_no_context_takeover:
+            if not server_no_context_takeover:
+                raise exceptions.NegotiationError("expected server_no_context_takeover")
+
+        # client_no_context_takeover
+        #
+        #   Req.    Resp.   Result
+        #   ------  ------  --------------------------------------------------
+        #   False   False   False
+        #   False   True    True
+        #   True    False   True - must change value
+        #   True    True    True
+
+        if self.client_no_context_takeover:
+            if not client_no_context_takeover:
+                client_no_context_takeover = True
+
+        # server_max_window_bits
+
+        #   Req.    Resp.   Result
+        #   ------  ------  --------------------------------------------------
+        #   None    None    None
+        #   None    8≤M≤15  M
+        #   8≤N≤15  None    Error!
+        #   8≤N≤15  8≤M≤N   M
+        #   8≤N≤15  N<M≤15  Error!
+
+        if self.server_max_window_bits is None:
+            pass
+
+        else:
+            if server_max_window_bits is None:
+                raise exceptions.NegotiationError("expected server_max_window_bits")
+            elif server_max_window_bits > self.server_max_window_bits:
+                raise exceptions.NegotiationError("unsupported server_max_window_bits")
+
+        # client_max_window_bits
+
+        #   Req.    Resp.   Result
+        #   ------  ------  --------------------------------------------------
+        #   None    None    None
+        #   None    8≤M≤15  Error!
+        #   True    None    None
+        #   True    8≤M≤15  M
+        #   8≤N≤15  None    N - must change value
+        #   8≤N≤15  8≤M≤N   M
+        #   8≤N≤15  N<M≤15  Error!
+
+        if self.client_max_window_bits is None:
+            if client_max_window_bits is not None:
+                raise exceptions.NegotiationError("unexpected client_max_window_bits")
+
+        elif self.client_max_window_bits is True:
+            pass
+
+        else:
+            if client_max_window_bits is None:
+                client_max_window_bits = self.client_max_window_bits
+            elif client_max_window_bits > self.client_max_window_bits:
+                raise exceptions.NegotiationError("unsupported client_max_window_bits")
+
+        return PerMessageDeflate(
+            server_no_context_takeover,  # remote_no_context_takeover
+            client_no_context_takeover,  # local_no_context_takeover
+            server_max_window_bits or 15,  # remote_max_window_bits
+            client_max_window_bits or 15,  # local_max_window_bits
+            self.compress_settings,
+        )
+
+
+def enable_client_permessage_deflate(
+    extensions: Optional[Sequence[ClientExtensionFactory]],
+) -> Sequence[ClientExtensionFactory]:
+    """
+    Enable Per-Message Deflate with default settings in client extensions.
+
+    If the extension is already present, perhaps with non-default settings,
+    the configuration isn't changed.
+
+    """
+    if extensions is None:
+        extensions = []
+    if not any(
+        extension_factory.name == ClientPerMessageDeflateFactory.name
+        for extension_factory in extensions
+    ):
+        extensions = list(extensions) + [
+            ClientPerMessageDeflateFactory(
+                compress_settings={"memLevel": 5},
+            )
+        ]
+    return extensions
+
+
+class ServerPerMessageDeflateFactory(ServerExtensionFactory):
+    """
+    Server-side extension factory for the Per-Message Deflate extension.
+
+    Parameters behave as described in `section 7.1 of RFC 7692`_.
+
+    .. _section 7.1 of RFC 7692: https://www.rfc-editor.org/rfc/rfc7692.html#section-7.1
+
+    Set them to :obj:`True` to include them in the negotiation offer without a
+    value or to an integer value to include them with this value.
+
+    Args:
+        server_no_context_takeover: prevent server from using context takeover.
+        client_no_context_takeover: prevent client from using context takeover.
+        server_max_window_bits: maximum size of the server's LZ77 sliding window
+            in bits, between 8 and 15.
+        client_max_window_bits: maximum size of the client's LZ77 sliding window
+            in bits, between 8 and 15.
+        compress_settings: additional keyword arguments for :func:`zlib.compressobj`,
+            excluding ``wbits``.
+        require_client_max_window_bits: do not enable compression at all if
+            client doesn't advertise support for ``client_max_window_bits``;
+            the default behavior is to enable compression without enforcing
+            ``client_max_window_bits``.
+
+    """
+
+    name = ExtensionName("permessage-deflate")
+
+    def __init__(
+        self,
+        server_no_context_takeover: bool = False,
+        client_no_context_takeover: bool = False,
+        server_max_window_bits: Optional[int] = None,
+        client_max_window_bits: Optional[int] = None,
+        compress_settings: Optional[Dict[str, Any]] = None,
+        require_client_max_window_bits: bool = False,
+    ) -> None:
+        """
+        Configure the Per-Message Deflate extension factory.
+
+        """
+        if not (server_max_window_bits is None or 8 <= server_max_window_bits <= 15):
+            raise ValueError("server_max_window_bits must be between 8 and 15")
+        if not (client_max_window_bits is None or 8 <= client_max_window_bits <= 15):
+            raise ValueError("client_max_window_bits must be between 8 and 15")
+        if compress_settings is not None and "wbits" in compress_settings:
+            raise ValueError(
+                "compress_settings must not include wbits, "
+                "set server_max_window_bits instead"
+            )
+        if client_max_window_bits is None and require_client_max_window_bits:
+            raise ValueError(
+                "require_client_max_window_bits is enabled, "
+                "but client_max_window_bits isn't configured"
+            )
+
+        self.server_no_context_takeover = server_no_context_takeover
+        self.client_no_context_takeover = client_no_context_takeover
+        self.server_max_window_bits = server_max_window_bits
+        self.client_max_window_bits = client_max_window_bits
+        self.compress_settings = compress_settings
+        self.require_client_max_window_bits = require_client_max_window_bits
+
+    def process_request_params(
+        self,
+        params: Sequence[ExtensionParameter],
+        accepted_extensions: Sequence[Extension],
+    ) -> Tuple[List[ExtensionParameter], PerMessageDeflate]:
+        """
+        Process request parameters.
+
+        Return response params and an extension instance.
+
+        """
+        if any(other.name == self.name for other in accepted_extensions):
+            raise exceptions.NegotiationError(f"skipped duplicate {self.name}")
+
+        # Load request parameters in local variables.
+        (
+            server_no_context_takeover,
+            client_no_context_takeover,
+            server_max_window_bits,
+            client_max_window_bits,
+        ) = _extract_parameters(params, is_server=True)
+
+        # Configuration parameters are available in instance variables.
+
+        # After comparing the request and the configuration, the response must
+        # be available in the local variables.
+
+        # server_no_context_takeover
+        #
+        #   Config  Req.    Resp.
+        #   ------  ------  --------------------------------------------------
+        #   False   False   False
+        #   False   True    True
+        #   True    False   True - must change value to True
+        #   True    True    True
+
+        if self.server_no_context_takeover:
+            if not server_no_context_takeover:
+                server_no_context_takeover = True
+
+        # client_no_context_takeover
+        #
+        #   Config  Req.    Resp.
+        #   ------  ------  --------------------------------------------------
+        #   False   False   False
+        #   False   True    True (or False)
+        #   True    False   True - must change value to True
+        #   True    True    True (or False)
+
+        if self.client_no_context_takeover:
+            if not client_no_context_takeover:
+                client_no_context_takeover = True
+
+        # server_max_window_bits
+
+        #   Config  Req.    Resp.
+        #   ------  ------  --------------------------------------------------
+        #   None    None    None
+        #   None    8≤M≤15  M
+        #   8≤N≤15  None    N - must change value
+        #   8≤N≤15  8≤M≤N   M
+        #   8≤N≤15  N<M≤15  N - must change value
+
+        if self.server_max_window_bits is None:
+            pass
+
+        else:
+            if server_max_window_bits is None:
+                server_max_window_bits = self.server_max_window_bits
+            elif server_max_window_bits > self.server_max_window_bits:
+                server_max_window_bits = self.server_max_window_bits
+
+        # client_max_window_bits
+
+        #   Config  Req.    Resp.
+        #   ------  ------  --------------------------------------------------
+        #   None    None    None
+        #   None    True    None - must change value
+        #   None    8≤M≤15  M (or None)
+        #   8≤N≤15  None    None or Error!
+        #   8≤N≤15  True    N - must change value
+        #   8≤N≤15  8≤M≤N   M (or None)
+        #   8≤N≤15  N<M≤15  N
+
+        if self.client_max_window_bits is None:
+            if client_max_window_bits is True:
+                client_max_window_bits = self.client_max_window_bits
+
+        else:
+            if client_max_window_bits is None:
+                if self.require_client_max_window_bits:
+                    raise exceptions.NegotiationError("required client_max_window_bits")
+            elif client_max_window_bits is True:
+                client_max_window_bits = self.client_max_window_bits
+            elif self.client_max_window_bits < client_max_window_bits:
+                client_max_window_bits = self.client_max_window_bits
+
+        return (
+            _build_parameters(
+                server_no_context_takeover,
+                client_no_context_takeover,
+                server_max_window_bits,
+                client_max_window_bits,
+            ),
+            PerMessageDeflate(
+                client_no_context_takeover,  # remote_no_context_takeover
+                server_no_context_takeover,  # local_no_context_takeover
+                client_max_window_bits or 15,  # remote_max_window_bits
+                server_max_window_bits or 15,  # local_max_window_bits
+                self.compress_settings,
+            ),
+        )
+
+
+def enable_server_permessage_deflate(
+    extensions: Optional[Sequence[ServerExtensionFactory]],
+) -> Sequence[ServerExtensionFactory]:
+    """
+    Enable Per-Message Deflate with default settings in server extensions.
+
+    If the extension is already present, perhaps with non-default settings,
+    the configuration isn't changed.
+
+    """
+    if extensions is None:
+        extensions = []
+    if not any(
+        ext_factory.name == ServerPerMessageDeflateFactory.name
+        for ext_factory in extensions
+    ):
+        extensions = list(extensions) + [
+            ServerPerMessageDeflateFactory(
+                server_max_window_bits=12,
+                client_max_window_bits=12,
+                compress_settings={"memLevel": 5},
+            )
+        ]
+    return extensions

code/.venv/lib/python3.12/site-packages/websockets/frames.py

@@ -0,0 +1,470 @@
+from __future__ import annotations
+
+import dataclasses
+import enum
+import io
+import secrets
+import struct
+from typing import Callable, Generator, Optional, Sequence, Tuple
+
+from . import exceptions, extensions
+from .typing import Data
+
+
+try:
+    from .speedups import apply_mask
+except ImportError:
+    from .utils import apply_mask
+
+
+__all__ = [
+    "Opcode",
+    "OP_CONT",
+    "OP_TEXT",
+    "OP_BINARY",
+    "OP_CLOSE",
+    "OP_PING",
+    "OP_PONG",
+    "DATA_OPCODES",
+    "CTRL_OPCODES",
+    "Frame",
+    "prepare_data",
+    "prepare_ctrl",
+    "Close",
+]
+
+
+class Opcode(enum.IntEnum):
+    """Opcode values for WebSocket frames."""
+
+    CONT, TEXT, BINARY = 0x00, 0x01, 0x02
+    CLOSE, PING, PONG = 0x08, 0x09, 0x0A
+
+
+OP_CONT = Opcode.CONT
+OP_TEXT = Opcode.TEXT
+OP_BINARY = Opcode.BINARY
+OP_CLOSE = Opcode.CLOSE
+OP_PING = Opcode.PING
+OP_PONG = Opcode.PONG
+
+DATA_OPCODES = OP_CONT, OP_TEXT, OP_BINARY
+CTRL_OPCODES = OP_CLOSE, OP_PING, OP_PONG
+
+
+class CloseCode(enum.IntEnum):
+    """Close code values for WebSocket close frames."""
+
+    NORMAL_CLOSURE = 1000
+    GOING_AWAY = 1001
+    PROTOCOL_ERROR = 1002
+    UNSUPPORTED_DATA = 1003
+    # 1004 is reserved
+    NO_STATUS_RCVD = 1005
+    ABNORMAL_CLOSURE = 1006
+    INVALID_DATA = 1007
+    POLICY_VIOLATION = 1008
+    MESSAGE_TOO_BIG = 1009
+    MANDATORY_EXTENSION = 1010
+    INTERNAL_ERROR = 1011
+    SERVICE_RESTART = 1012
+    TRY_AGAIN_LATER = 1013
+    BAD_GATEWAY = 1014
+    TLS_HANDSHAKE = 1015
+
+
+# See https://www.iana.org/assignments/websocket/websocket.xhtml
+CLOSE_CODE_EXPLANATIONS: dict[int, str] = {
+    CloseCode.NORMAL_CLOSURE: "OK",
+    CloseCode.GOING_AWAY: "going away",
+    CloseCode.PROTOCOL_ERROR: "protocol error",
+    CloseCode.UNSUPPORTED_DATA: "unsupported data",
+    CloseCode.NO_STATUS_RCVD: "no status received [internal]",
+    CloseCode.ABNORMAL_CLOSURE: "abnormal closure [internal]",
+    CloseCode.INVALID_DATA: "invalid frame payload data",
+    CloseCode.POLICY_VIOLATION: "policy violation",
+    CloseCode.MESSAGE_TOO_BIG: "message too big",
+    CloseCode.MANDATORY_EXTENSION: "mandatory extension",
+    CloseCode.INTERNAL_ERROR: "internal error",
+    CloseCode.SERVICE_RESTART: "service restart",
+    CloseCode.TRY_AGAIN_LATER: "try again later",
+    CloseCode.BAD_GATEWAY: "bad gateway",
+    CloseCode.TLS_HANDSHAKE: "TLS handshake failure [internal]",
+}
+
+
+# Close code that are allowed in a close frame.
+# Using a set optimizes `code in EXTERNAL_CLOSE_CODES`.
+EXTERNAL_CLOSE_CODES = {
+    CloseCode.NORMAL_CLOSURE,
+    CloseCode.GOING_AWAY,
+    CloseCode.PROTOCOL_ERROR,
+    CloseCode.UNSUPPORTED_DATA,
+    CloseCode.INVALID_DATA,
+    CloseCode.POLICY_VIOLATION,
+    CloseCode.MESSAGE_TOO_BIG,
+    CloseCode.MANDATORY_EXTENSION,
+    CloseCode.INTERNAL_ERROR,
+    CloseCode.SERVICE_RESTART,
+    CloseCode.TRY_AGAIN_LATER,
+    CloseCode.BAD_GATEWAY,
+}
+
+
+OK_CLOSE_CODES = {
+    CloseCode.NORMAL_CLOSURE,
+    CloseCode.GOING_AWAY,
+    CloseCode.NO_STATUS_RCVD,
+}
+
+
+BytesLike = bytes, bytearray, memoryview
+
+
+@dataclasses.dataclass
+class Frame:
+    """
+    WebSocket frame.
+
+    Attributes:
+        opcode: Opcode.
+        data: Payload data.
+        fin: FIN bit.
+        rsv1: RSV1 bit.
+        rsv2: RSV2 bit.
+        rsv3: RSV3 bit.
+
+    Only these fields are needed. The MASK bit, payload length and masking-key
+    are handled on the fly when parsing and serializing frames.
+
+    """
+
+    opcode: Opcode
+    data: bytes
+    fin: bool = True
+    rsv1: bool = False
+    rsv2: bool = False
+    rsv3: bool = False
+
+    def __str__(self) -> str:
+        """
+        Return a human-readable representation of a frame.
+
+        """
+        coding = None
+        length = f"{len(self.data)} byte{'' if len(self.data) == 1 else 's'}"
+        non_final = "" if self.fin else "continued"
+
+        if self.opcode is OP_TEXT:
+            # Decoding only the beginning and the end is needlessly hard.
+            # Decode the entire payload then elide later if necessary.
+            data = repr(self.data.decode())
+        elif self.opcode is OP_BINARY:
+            # We'll show at most the first 16 bytes and the last 8 bytes.
+            # Encode just what we need, plus two dummy bytes to elide later.
+            binary = self.data
+            if len(binary) > 25:
+                binary = b"".join([binary[:16], b"\x00\x00", binary[-8:]])
+            data = " ".join(f"{byte:02x}" for byte in binary)
+        elif self.opcode is OP_CLOSE:
+            data = str(Close.parse(self.data))
+        elif self.data:
+            # We don't know if a Continuation frame contains text or binary.
+            # Ping and Pong frames could contain UTF-8.
+            # Attempt to decode as UTF-8 and display it as text; fallback to
+            # binary. If self.data is a memoryview, it has no decode() method,
+            # which raises AttributeError.
+            try:
+                data = repr(self.data.decode())
+                coding = "text"
+            except (UnicodeDecodeError, AttributeError):
+                binary = self.data
+                if len(binary) > 25:
+                    binary = b"".join([binary[:16], b"\x00\x00", binary[-8:]])
+                data = " ".join(f"{byte:02x}" for byte in binary)
+                coding = "binary"
+        else:
+            data = "''"
+
+        if len(data) > 75:
+            data = data[:48] + "..." + data[-24:]
+
+        metadata = ", ".join(filter(None, [coding, length, non_final]))
+
+        return f"{self.opcode.name} {data} [{metadata}]"
+
+    @classmethod
+    def parse(
+        cls,
+        read_exact: Callable[[int], Generator[None, None, bytes]],
+        *,
+        mask: bool,
+        max_size: Optional[int] = None,
+        extensions: Optional[Sequence[extensions.Extension]] = None,
+    ) -> Generator[None, None, Frame]:
+        """
+        Parse a WebSocket frame.
+
+        This is a generator-based coroutine.
+
+        Args:
+            read_exact: generator-based coroutine that reads the requested
+                bytes or raises an exception if there isn't enough data.
+            mask: whether the frame should be masked i.e. whether the read
+                happens on the server side.
+            max_size: maximum payload size in bytes.
+            extensions: list of extensions, applied in reverse order.
+
+        Raises:
+            EOFError: if the connection is closed without a full WebSocket frame.
+            UnicodeDecodeError: if the frame contains invalid UTF-8.
+            PayloadTooBig: if the frame's payload size exceeds ``max_size``.
+            ProtocolError: if the frame contains incorrect values.
+
+        """
+        # Read the header.
+        data = yield from read_exact(2)
+        head1, head2 = struct.unpack("!BB", data)
+
+        # While not Pythonic, this is marginally faster than calling bool().
+        fin = True if head1 & 0b10000000 else False
+        rsv1 = True if head1 & 0b01000000 else False
+        rsv2 = True if head1 & 0b00100000 else False
+        rsv3 = True if head1 & 0b00010000 else False
+
+        try:
+            opcode = Opcode(head1 & 0b00001111)
+        except ValueError as exc:
+            raise exceptions.ProtocolError("invalid opcode") from exc
+
+        if (True if head2 & 0b10000000 else False) != mask:
+            raise exceptions.ProtocolError("incorrect masking")
+
+        length = head2 & 0b01111111
+        if length == 126:
+            data = yield from read_exact(2)
+            (length,) = struct.unpack("!H", data)
+        elif length == 127:
+            data = yield from read_exact(8)
+            (length,) = struct.unpack("!Q", data)
+        if max_size is not None and length > max_size:
+            raise exceptions.PayloadTooBig(
+                f"over size limit ({length} > {max_size} bytes)"
+            )
+        if mask:
+            mask_bytes = yield from read_exact(4)
+
+        # Read the data.
+        data = yield from read_exact(length)
+        if mask:
+            data = apply_mask(data, mask_bytes)
+
+        frame = cls(opcode, data, fin, rsv1, rsv2, rsv3)
+
+        if extensions is None:
+            extensions = []
+        for extension in reversed(extensions):
+            frame = extension.decode(frame, max_size=max_size)
+
+        frame.check()
+
+        return frame
+
+    def serialize(
+        self,
+        *,
+        mask: bool,
+        extensions: Optional[Sequence[extensions.Extension]] = None,
+    ) -> bytes:
+        """
+        Serialize a WebSocket frame.
+
+        Args:
+            mask: whether the frame should be masked i.e. whether the write
+                happens on the client side.
+            extensions: list of extensions, applied in order.
+
+        Raises:
+            ProtocolError: if the frame contains incorrect values.
+
+        """
+        self.check()
+
+        if extensions is None:
+            extensions = []
+        for extension in extensions:
+            self = extension.encode(self)
+
+        output = io.BytesIO()
+
+        # Prepare the header.
+        head1 = (
+            (0b10000000 if self.fin else 0)
+            | (0b01000000 if self.rsv1 else 0)
+            | (0b00100000 if self.rsv2 else 0)
+            | (0b00010000 if self.rsv3 else 0)
+            | self.opcode
+        )
+
+        head2 = 0b10000000 if mask else 0
+
+        length = len(self.data)
+        if length < 126:
+            output.write(struct.pack("!BB", head1, head2 | length))
+        elif length < 65536:
+            output.write(struct.pack("!BBH", head1, head2 | 126, length))
+        else:
+            output.write(struct.pack("!BBQ", head1, head2 | 127, length))
+
+        if mask:
+            mask_bytes = secrets.token_bytes(4)
+            output.write(mask_bytes)
+
+        # Prepare the data.
+        if mask:
+            data = apply_mask(self.data, mask_bytes)
+        else:
+            data = self.data
+        output.write(data)
+
+        return output.getvalue()
+
+    def check(self) -> None:
+        """
+        Check that reserved bits and opcode have acceptable values.
+
+        Raises:
+            ProtocolError: if a reserved bit or the opcode is invalid.
+
+        """
+        if self.rsv1 or self.rsv2 or self.rsv3:
+            raise exceptions.ProtocolError("reserved bits must be 0")
+
+        if self.opcode in CTRL_OPCODES:
+            if len(self.data) > 125:
+                raise exceptions.ProtocolError("control frame too long")
+            if not self.fin:
+                raise exceptions.ProtocolError("fragmented control frame")
+
+
+def prepare_data(data: Data) -> Tuple[int, bytes]:
+    """
+    Convert a string or byte-like object to an opcode and a bytes-like object.
+
+    This function is designed for data frames.
+
+    If ``data`` is a :class:`str`, return ``OP_TEXT`` and a :class:`bytes`
+    object encoding ``data`` in UTF-8.
+
+    If ``data`` is a bytes-like object, return ``OP_BINARY`` and a bytes-like
+    object.
+
+    Raises:
+        TypeError: if ``data`` doesn't have a supported type.
+
+    """
+    if isinstance(data, str):
+        return OP_TEXT, data.encode("utf-8")
+    elif isinstance(data, BytesLike):
+        return OP_BINARY, data
+    else:
+        raise TypeError("data must be str or bytes-like")
+
+
+def prepare_ctrl(data: Data) -> bytes:
+    """
+    Convert a string or byte-like object to bytes.
+
+    This function is designed for ping and pong frames.
+
+    If ``data`` is a :class:`str`, return a :class:`bytes` object encoding
+    ``data`` in UTF-8.
+
+    If ``data`` is a bytes-like object, return a :class:`bytes` object.
+
+    Raises:
+        TypeError: if ``data`` doesn't have a supported type.
+
+    """
+    if isinstance(data, str):
+        return data.encode("utf-8")
+    elif isinstance(data, BytesLike):
+        return bytes(data)
+    else:
+        raise TypeError("data must be str or bytes-like")
+
+
+@dataclasses.dataclass
+class Close:
+    """
+    Code and reason for WebSocket close frames.
+
+    Attributes:
+        code: Close code.
+        reason: Close reason.
+
+    """
+
+    code: int
+    reason: str
+
+    def __str__(self) -> str:
+        """
+        Return a human-readable representation of a close code and reason.
+
+        """
+        if 3000 <= self.code < 4000:
+            explanation = "registered"
+        elif 4000 <= self.code < 5000:
+            explanation = "private use"
+        else:
+            explanation = CLOSE_CODE_EXPLANATIONS.get(self.code, "unknown")
+        result = f"{self.code} ({explanation})"
+
+        if self.reason:
+            result = f"{result} {self.reason}"
+
+        return result
+
+    @classmethod
+    def parse(cls, data: bytes) -> Close:
+        """
+        Parse the payload of a close frame.
+
+        Args:
+            data: payload of the close frame.
+
+        Raises:
+            ProtocolError: if data is ill-formed.
+            UnicodeDecodeError: if the reason isn't valid UTF-8.
+
+        """
+        if len(data) >= 2:
+            (code,) = struct.unpack("!H", data[:2])
+            reason = data[2:].decode("utf-8")
+            close = cls(code, reason)
+            close.check()
+            return close
+        elif len(data) == 0:
+            return cls(CloseCode.NO_STATUS_RCVD, "")
+        else:
+            raise exceptions.ProtocolError("close frame too short")
+
+    def serialize(self) -> bytes:
+        """
+        Serialize the payload of a close frame.
+
+        """
+        self.check()
+        return struct.pack("!H", self.code) + self.reason.encode("utf-8")
+
+    def check(self) -> None:
+        """
+        Check that the close code has a valid value for a close frame.
+
+        Raises:
+            ProtocolError: if the close code is invalid.
+
+        """
+        if not (self.code in EXTERNAL_CLOSE_CODES or 3000 <= self.code < 5000):
+            raise exceptions.ProtocolError("invalid status code")

code/.venv/lib/python3.12/site-packages/websockets/headers.py

@@ -0,0 +1,587 @@
+from __future__ import annotations
+
+import base64
+import binascii
+import ipaddress
+import re
+from typing import Callable, List, Optional, Sequence, Tuple, TypeVar, cast
+
+from . import exceptions
+from .typing import (
+    ConnectionOption,
+    ExtensionHeader,
+    ExtensionName,
+    ExtensionParameter,
+    Subprotocol,
+    UpgradeProtocol,
+)
+
+
+__all__ = [
+    "build_host",
+    "parse_connection",
+    "parse_upgrade",
+    "parse_extension",
+    "build_extension",
+    "parse_subprotocol",
+    "build_subprotocol",
+    "validate_subprotocols",
+    "build_www_authenticate_basic",
+    "parse_authorization_basic",
+    "build_authorization_basic",
+]
+
+
+T = TypeVar("T")
+
+
+def build_host(host: str, port: int, secure: bool) -> str:
+    """
+    Build a ``Host`` header.
+
+    """
+    # https://www.rfc-editor.org/rfc/rfc3986.html#section-3.2.2
+    # IPv6 addresses must be enclosed in brackets.
+    try:
+        address = ipaddress.ip_address(host)
+    except ValueError:
+        # host is a hostname
+        pass
+    else:
+        # host is an IP address
+        if address.version == 6:
+            host = f"[{host}]"
+
+    if port != (443 if secure else 80):
+        host = f"{host}:{port}"
+
+    return host
+
+
+# To avoid a dependency on a parsing library, we implement manually the ABNF
+# described in https://www.rfc-editor.org/rfc/rfc6455.html#section-9.1 and
+# https://www.rfc-editor.org/rfc/rfc7230.html#appendix-B.
+
+
+def peek_ahead(header: str, pos: int) -> Optional[str]:
+    """
+    Return the next character from ``header`` at the given position.
+
+    Return :obj:`None` at the end of ``header``.
+
+    We never need to peek more than one character ahead.
+
+    """
+    return None if pos == len(header) else header[pos]
+
+
+_OWS_re = re.compile(r"[\t ]*")
+
+
+def parse_OWS(header: str, pos: int) -> int:
+    """
+    Parse optional whitespace from ``header`` at the given position.
+
+    Return the new position.
+
+    The whitespace itself isn't returned because it isn't significant.
+
+    """
+    # There's always a match, possibly empty, whose content doesn't matter.
+    match = _OWS_re.match(header, pos)
+    assert match is not None
+    return match.end()
+
+
+_token_re = re.compile(r"[-!#$%&\'*+.^_`|~0-9a-zA-Z]+")
+
+
+def parse_token(header: str, pos: int, header_name: str) -> Tuple[str, int]:
+    """
+    Parse a token from ``header`` at the given position.
+
+    Return the token value and the new position.
+
+    Raises:
+        InvalidHeaderFormat: on invalid inputs.
+
+    """
+    match = _token_re.match(header, pos)
+    if match is None:
+        raise exceptions.InvalidHeaderFormat(header_name, "expected token", header, pos)
+    return match.group(), match.end()
+
+
+_quoted_string_re = re.compile(
+    r'"(?:[\x09\x20-\x21\x23-\x5b\x5d-\x7e]|\\[\x09\x20-\x7e\x80-\xff])*"'
+)
+
+
+_unquote_re = re.compile(r"\\([\x09\x20-\x7e\x80-\xff])")
+
+
+def parse_quoted_string(header: str, pos: int, header_name: str) -> Tuple[str, int]:
+    """
+    Parse a quoted string from ``header`` at the given position.
+
+    Return the unquoted value and the new position.
+
+    Raises:
+        InvalidHeaderFormat: on invalid inputs.
+
+    """
+    match = _quoted_string_re.match(header, pos)
+    if match is None:
+        raise exceptions.InvalidHeaderFormat(
+            header_name, "expected quoted string", header, pos
+        )
+    return _unquote_re.sub(r"\1", match.group()[1:-1]), match.end()
+
+
+_quotable_re = re.compile(r"[\x09\x20-\x7e\x80-\xff]*")
+
+
+_quote_re = re.compile(r"([\x22\x5c])")
+
+
+def build_quoted_string(value: str) -> str:
+    """
+    Format ``value`` as a quoted string.
+
+    This is the reverse of :func:`parse_quoted_string`.
+
+    """
+    match = _quotable_re.fullmatch(value)
+    if match is None:
+        raise ValueError("invalid characters for quoted-string encoding")
+    return '"' + _quote_re.sub(r"\\\1", value) + '"'
+
+
+def parse_list(
+    parse_item: Callable[[str, int, str], Tuple[T, int]],
+    header: str,
+    pos: int,
+    header_name: str,
+) -> List[T]:
+    """
+    Parse a comma-separated list from ``header`` at the given position.
+
+    This is appropriate for parsing values with the following grammar:
+
+        1#item
+
+    ``parse_item`` parses one item.
+
+    ``header`` is assumed not to start or end with whitespace.
+
+    (This function is designed for parsing an entire header value and
+    :func:`~websockets.http.read_headers` strips whitespace from values.)
+
+    Return a list of items.
+
+    Raises:
+        InvalidHeaderFormat: on invalid inputs.
+
+    """
+    # Per https://www.rfc-editor.org/rfc/rfc7230.html#section-7, "a recipient
+    # MUST parse and ignore a reasonable number of empty list elements";
+    # hence while loops that remove extra delimiters.
+
+    # Remove extra delimiters before the first item.
+    while peek_ahead(header, pos) == ",":
+        pos = parse_OWS(header, pos + 1)
+
+    items = []
+    while True:
+        # Loop invariant: a item starts at pos in header.
+        item, pos = parse_item(header, pos, header_name)
+        items.append(item)
+        pos = parse_OWS(header, pos)
+
+        # We may have reached the end of the header.
+        if pos == len(header):
+            break
+
+        # There must be a delimiter after each element except the last one.
+        if peek_ahead(header, pos) == ",":
+            pos = parse_OWS(header, pos + 1)
+        else:
+            raise exceptions.InvalidHeaderFormat(
+                header_name, "expected comma", header, pos
+            )
+
+        # Remove extra delimiters before the next item.
+        while peek_ahead(header, pos) == ",":
+            pos = parse_OWS(header, pos + 1)
+
+        # We may have reached the end of the header.
+        if pos == len(header):
+            break
+
+    # Since we only advance in the header by one character with peek_ahead()
+    # or with the end position of a regex match, we can't overshoot the end.
+    assert pos == len(header)
+
+    return items
+
+
+def parse_connection_option(
+    header: str, pos: int, header_name: str
+) -> Tuple[ConnectionOption, int]:
+    """
+    Parse a Connection option from ``header`` at the given position.
+
+    Return the protocol value and the new position.
+
+    Raises:
+        InvalidHeaderFormat: on invalid inputs.
+
+    """
+    item, pos = parse_token(header, pos, header_name)
+    return cast(ConnectionOption, item), pos
+
+
+def parse_connection(header: str) -> List[ConnectionOption]:
+    """
+    Parse a ``Connection`` header.
+
+    Return a list of HTTP connection options.
+
+    Args
+        header: value of the ``Connection`` header.
+
+    Raises:
+        InvalidHeaderFormat: on invalid inputs.
+
+    """
+    return parse_list(parse_connection_option, header, 0, "Connection")
+
+
+_protocol_re = re.compile(
+    r"[-!#$%&\'*+.^_`|~0-9a-zA-Z]+(?:/[-!#$%&\'*+.^_`|~0-9a-zA-Z]+)?"
+)
+
+
+def parse_upgrade_protocol(
+    header: str, pos: int, header_name: str
+) -> Tuple[UpgradeProtocol, int]:
+    """
+    Parse an Upgrade protocol from ``header`` at the given position.
+
+    Return the protocol value and the new position.
+
+    Raises:
+        InvalidHeaderFormat: on invalid inputs.
+
+    """
+    match = _protocol_re.match(header, pos)
+    if match is None:
+        raise exceptions.InvalidHeaderFormat(
+            header_name, "expected protocol", header, pos
+        )
+    return cast(UpgradeProtocol, match.group()), match.end()
+
+
+def parse_upgrade(header: str) -> List[UpgradeProtocol]:
+    """
+    Parse an ``Upgrade`` header.
+
+    Return a list of HTTP protocols.
+
+    Args:
+        header: value of the ``Upgrade`` header.
+
+    Raises:
+        InvalidHeaderFormat: on invalid inputs.
+
+    """
+    return parse_list(parse_upgrade_protocol, header, 0, "Upgrade")
+
+
+def parse_extension_item_param(
+    header: str, pos: int, header_name: str
+) -> Tuple[ExtensionParameter, int]:
+    """
+    Parse a single extension parameter from ``header`` at the given position.
+
+    Return a ``(name, value)`` pair and the new position.
+
+    Raises:
+        InvalidHeaderFormat: on invalid inputs.
+
+    """
+    # Extract parameter name.
+    name, pos = parse_token(header, pos, header_name)
+    pos = parse_OWS(header, pos)
+    # Extract parameter value, if there is one.
+    value: Optional[str] = None
+    if peek_ahead(header, pos) == "=":
+        pos = parse_OWS(header, pos + 1)
+        if peek_ahead(header, pos) == '"':
+            pos_before = pos  # for proper error reporting below
+            value, pos = parse_quoted_string(header, pos, header_name)
+            # https://www.rfc-editor.org/rfc/rfc6455.html#section-9.1 says:
+            # the value after quoted-string unescaping MUST conform to
+            # the 'token' ABNF.
+            if _token_re.fullmatch(value) is None:
+                raise exceptions.InvalidHeaderFormat(
+                    header_name, "invalid quoted header content", header, pos_before
+                )
+        else:
+            value, pos = parse_token(header, pos, header_name)
+        pos = parse_OWS(header, pos)
+
+    return (name, value), pos
+
+
+def parse_extension_item(
+    header: str, pos: int, header_name: str
+) -> Tuple[ExtensionHeader, int]:
+    """
+    Parse an extension definition from ``header`` at the given position.
+
+    Return an ``(extension name, parameters)`` pair, where ``parameters`` is a
+    list of ``(name, value)`` pairs, and the new position.
+
+    Raises:
+        InvalidHeaderFormat: on invalid inputs.
+
+    """
+    # Extract extension name.
+    name, pos = parse_token(header, pos, header_name)
+    pos = parse_OWS(header, pos)
+    # Extract all parameters.
+    parameters = []
+    while peek_ahead(header, pos) == ";":
+        pos = parse_OWS(header, pos + 1)
+        parameter, pos = parse_extension_item_param(header, pos, header_name)
+        parameters.append(parameter)
+    return (cast(ExtensionName, name), parameters), pos
+
+
+def parse_extension(header: str) -> List[ExtensionHeader]:
+    """
+    Parse a ``Sec-WebSocket-Extensions`` header.
+
+    Return a list of WebSocket extensions and their parameters in this format::
+
+        [
+            (
+                'extension name',
+                [
+                    ('parameter name', 'parameter value'),
+                    ....
+                ]
+            ),
+            ...
+        ]
+
+    Parameter values are :obj:`None` when no value is provided.
+
+    Raises:
+        InvalidHeaderFormat: on invalid inputs.
+
+    """
+    return parse_list(parse_extension_item, header, 0, "Sec-WebSocket-Extensions")
+
+
+parse_extension_list = parse_extension  # alias for backwards compatibility
+
+
+def build_extension_item(
+    name: ExtensionName, parameters: List[ExtensionParameter]
+) -> str:
+    """
+    Build an extension definition.
+
+    This is the reverse of :func:`parse_extension_item`.
+
+    """
+    return "; ".join(
+        [cast(str, name)]
+        + [
+            # Quoted strings aren't necessary because values are always tokens.
+            name if value is None else f"{name}={value}"
+            for name, value in parameters
+        ]
+    )
+
+
+def build_extension(extensions: Sequence[ExtensionHeader]) -> str:
+    """
+    Build a ``Sec-WebSocket-Extensions`` header.
+
+    This is the reverse of :func:`parse_extension`.
+
+    """
+    return ", ".join(
+        build_extension_item(name, parameters) for name, parameters in extensions
+    )
+
+
+build_extension_list = build_extension  # alias for backwards compatibility
+
+
+def parse_subprotocol_item(
+    header: str, pos: int, header_name: str
+) -> Tuple[Subprotocol, int]:
+    """
+    Parse a subprotocol from ``header`` at the given position.
+
+    Return the subprotocol value and the new position.
+
+    Raises:
+        InvalidHeaderFormat: on invalid inputs.
+
+    """
+    item, pos = parse_token(header, pos, header_name)
+    return cast(Subprotocol, item), pos
+
+
+def parse_subprotocol(header: str) -> List[Subprotocol]:
+    """
+    Parse a ``Sec-WebSocket-Protocol`` header.
+
+    Return a list of WebSocket subprotocols.
+
+    Raises:
+        InvalidHeaderFormat: on invalid inputs.
+
+    """
+    return parse_list(parse_subprotocol_item, header, 0, "Sec-WebSocket-Protocol")
+
+
+parse_subprotocol_list = parse_subprotocol  # alias for backwards compatibility
+
+
+def build_subprotocol(subprotocols: Sequence[Subprotocol]) -> str:
+    """
+    Build a ``Sec-WebSocket-Protocol`` header.
+
+    This is the reverse of :func:`parse_subprotocol`.
+
+    """
+    return ", ".join(subprotocols)
+
+
+build_subprotocol_list = build_subprotocol  # alias for backwards compatibility
+
+
+def validate_subprotocols(subprotocols: Sequence[Subprotocol]) -> None:
+    """
+    Validate that ``subprotocols`` is suitable for :func:`build_subprotocol`.
+
+    """
+    if not isinstance(subprotocols, Sequence):
+        raise TypeError("subprotocols must be a list")
+    if isinstance(subprotocols, str):
+        raise TypeError("subprotocols must be a list, not a str")
+    for subprotocol in subprotocols:
+        if not _token_re.fullmatch(subprotocol):
+            raise ValueError(f"invalid subprotocol: {subprotocol}")
+
+
+def build_www_authenticate_basic(realm: str) -> str:
+    """
+    Build a ``WWW-Authenticate`` header for HTTP Basic Auth.
+
+    Args:
+        realm: identifier of the protection space.
+
+    """
+    # https://www.rfc-editor.org/rfc/rfc7617.html#section-2
+    realm = build_quoted_string(realm)
+    charset = build_quoted_string("UTF-8")
+    return f"Basic realm={realm}, charset={charset}"
+
+
+_token68_re = re.compile(r"[A-Za-z0-9-._~+/]+=*")
+
+
+def parse_token68(header: str, pos: int, header_name: str) -> Tuple[str, int]:
+    """
+    Parse a token68 from ``header`` at the given position.
+
+    Return the token value and the new position.
+
+    Raises:
+        InvalidHeaderFormat: on invalid inputs.
+
+    """
+    match = _token68_re.match(header, pos)
+    if match is None:
+        raise exceptions.InvalidHeaderFormat(
+            header_name, "expected token68", header, pos
+        )
+    return match.group(), match.end()
+
+
+def parse_end(header: str, pos: int, header_name: str) -> None:
+    """
+    Check that parsing reached the end of header.
+
+    """
+    if pos < len(header):
+        raise exceptions.InvalidHeaderFormat(header_name, "trailing data", header, pos)
+
+
+def parse_authorization_basic(header: str) -> Tuple[str, str]:
+    """
+    Parse an ``Authorization`` header for HTTP Basic Auth.
+
+    Return a ``(username, password)`` tuple.
+
+    Args:
+        header: value of the ``Authorization`` header.
+
+    Raises:
+        InvalidHeaderFormat: on invalid inputs.
+        InvalidHeaderValue: on unsupported inputs.
+
+    """
+    # https://www.rfc-editor.org/rfc/rfc7235.html#section-2.1
+    # https://www.rfc-editor.org/rfc/rfc7617.html#section-2
+    scheme, pos = parse_token(header, 0, "Authorization")
+    if scheme.lower() != "basic":
+        raise exceptions.InvalidHeaderValue(
+            "Authorization",
+            f"unsupported scheme: {scheme}",
+        )
+    if peek_ahead(header, pos) != " ":
+        raise exceptions.InvalidHeaderFormat(
+            "Authorization", "expected space after scheme", header, pos
+        )
+    pos += 1
+    basic_credentials, pos = parse_token68(header, pos, "Authorization")
+    parse_end(header, pos, "Authorization")
+
+    try:
+        user_pass = base64.b64decode(basic_credentials.encode()).decode()
+    except binascii.Error:
+        raise exceptions.InvalidHeaderValue(
+            "Authorization",
+            "expected base64-encoded credentials",
+        ) from None
+    try:
+        username, password = user_pass.split(":", 1)
+    except ValueError:
+        raise exceptions.InvalidHeaderValue(
+            "Authorization",
+            "expected username:password credentials",
+        ) from None
+
+    return username, password
+
+
+def build_authorization_basic(username: str, password: str) -> str:
+    """
+    Build an ``Authorization`` header for HTTP Basic Auth.
+
+    This is the reverse of :func:`parse_authorization_basic`.
+
+    """
+    # https://www.rfc-editor.org/rfc/rfc7617.html#section-2
+    assert ":" not in username
+    user_pass = f"{username}:{password}"
+    basic_credentials = base64.b64encode(user_pass.encode()).decode()
+    return "Basic " + basic_credentials

code/.venv/lib/python3.12/site-packages/websockets/http.py

@@ -0,0 +1,35 @@
+from __future__ import annotations
+
+import sys
+import typing
+
+from .imports import lazy_import
+from .version import version as websockets_version
+
+
+# For backwards compatibility:
+
+
+# When type checking, import non-deprecated aliases eagerly. Else, import on demand.
+if typing.TYPE_CHECKING:
+    from .datastructures import Headers, MultipleValuesError  # noqa: F401
+else:
+    lazy_import(
+        globals(),
+        # Headers and MultipleValuesError used to be defined in this module.
+        aliases={
+            "Headers": ".datastructures",
+            "MultipleValuesError": ".datastructures",
+        },
+        deprecated_aliases={
+            "read_request": ".legacy.http",
+            "read_response": ".legacy.http",
+        },
+    )
+
+
+__all__ = ["USER_AGENT"]
+
+
+PYTHON_VERSION = "{}.{}".format(*sys.version_info)
+USER_AGENT = f"Python/{PYTHON_VERSION} websockets/{websockets_version}"

code/.venv/lib/python3.12/site-packages/websockets/http11.py

@@ -0,0 +1,364 @@
+from __future__ import annotations
+
+import dataclasses
+import re
+import warnings
+from typing import Callable, Generator, Optional
+
+from . import datastructures, exceptions
+
+
+# Maximum total size of headers is around 128 * 8 KiB = 1 MiB.
+MAX_HEADERS = 128
+
+# Limit request line and header lines. 8KiB is the most common default
+# configuration of popular HTTP servers.
+MAX_LINE = 8192
+
+# Support for HTTP response bodies is intended to read an error message
+# returned by a server. It isn't designed to perform large file transfers.
+MAX_BODY = 2**20  # 1 MiB
+
+
+def d(value: bytes) -> str:
+    """
+    Decode a bytestring for interpolating into an error message.
+
+    """
+    return value.decode(errors="backslashreplace")
+
+
+# See https://www.rfc-editor.org/rfc/rfc7230.html#appendix-B.
+
+# Regex for validating header names.
+
+_token_re = re.compile(rb"[-!#$%&\'*+.^_`|~0-9a-zA-Z]+")
+
+# Regex for validating header values.
+
+# We don't attempt to support obsolete line folding.
+
+# Include HTAB (\x09), SP (\x20), VCHAR (\x21-\x7e), obs-text (\x80-\xff).
+
+# The ABNF is complicated because it attempts to express that optional
+# whitespace is ignored. We strip whitespace and don't revalidate that.
+
+# See also https://www.rfc-editor.org/errata_search.php?rfc=7230&eid=4189
+
+_value_re = re.compile(rb"[\x09\x20-\x7e\x80-\xff]*")
+
+
+@dataclasses.dataclass
+class Request:
+    """
+    WebSocket handshake request.
+
+    Attributes:
+        path: Request path, including optional query.
+        headers: Request headers.
+    """
+
+    path: str
+    headers: datastructures.Headers
+    # body isn't useful is the context of this library.
+
+    _exception: Optional[Exception] = None
+
+    @property
+    def exception(self) -> Optional[Exception]:  # pragma: no cover
+        warnings.warn(
+            "Request.exception is deprecated; "
+            "use ServerProtocol.handshake_exc instead",
+            DeprecationWarning,
+        )
+        return self._exception
+
+    @classmethod
+    def parse(
+        cls,
+        read_line: Callable[[int], Generator[None, None, bytes]],
+    ) -> Generator[None, None, Request]:
+        """
+        Parse a WebSocket handshake request.
+
+        This is a generator-based coroutine.
+
+        The request path isn't URL-decoded or validated in any way.
+
+        The request path and headers are expected to contain only ASCII
+        characters. Other characters are represented with surrogate escapes.
+
+        :meth:`parse` doesn't attempt to read the request body because
+        WebSocket handshake requests don't have one. If the request contains a
+        body, it may be read from the data stream after :meth:`parse` returns.
+
+        Args:
+            read_line: generator-based coroutine that reads a LF-terminated
+                line or raises an exception if there isn't enough data
+
+        Raises:
+            EOFError: if the connection is closed without a full HTTP request.
+            SecurityError: if the request exceeds a security limit.
+            ValueError: if the request isn't well formatted.
+
+        """
+        # https://www.rfc-editor.org/rfc/rfc7230.html#section-3.1.1
+
+        # Parsing is simple because fixed values are expected for method and
+        # version and because path isn't checked. Since WebSocket software tends
+        # to implement HTTP/1.1 strictly, there's little need for lenient parsing.
+
+        try:
+            request_line = yield from parse_line(read_line)
+        except EOFError as exc:
+            raise EOFError("connection closed while reading HTTP request line") from exc
+
+        try:
+            method, raw_path, version = request_line.split(b" ", 2)
+        except ValueError:  # not enough values to unpack (expected 3, got 1-2)
+            raise ValueError(f"invalid HTTP request line: {d(request_line)}") from None
+
+        if method != b"GET":
+            raise ValueError(f"unsupported HTTP method: {d(method)}")
+        if version != b"HTTP/1.1":
+            raise ValueError(f"unsupported HTTP version: {d(version)}")
+        path = raw_path.decode("ascii", "surrogateescape")
+
+        headers = yield from parse_headers(read_line)
+
+        # https://www.rfc-editor.org/rfc/rfc7230.html#section-3.3.3
+
+        if "Transfer-Encoding" in headers:
+            raise NotImplementedError("transfer codings aren't supported")
+
+        if "Content-Length" in headers:
+            raise ValueError("unsupported request body")
+
+        return cls(path, headers)
+
+    def serialize(self) -> bytes:
+        """
+        Serialize a WebSocket handshake request.
+
+        """
+        # Since the request line and headers only contain ASCII characters,
+        # we can keep this simple.
+        request = f"GET {self.path} HTTP/1.1\r\n".encode()
+        request += self.headers.serialize()
+        return request
+
+
+@dataclasses.dataclass
+class Response:
+    """
+    WebSocket handshake response.
+
+    Attributes:
+        status_code: Response code.
+        reason_phrase: Response reason.
+        headers: Response headers.
+        body: Response body, if any.
+
+    """
+
+    status_code: int
+    reason_phrase: str
+    headers: datastructures.Headers
+    body: Optional[bytes] = None
+
+    _exception: Optional[Exception] = None
+
+    @property
+    def exception(self) -> Optional[Exception]:  # pragma: no cover
+        warnings.warn(
+            "Response.exception is deprecated; "
+            "use ClientProtocol.handshake_exc instead",
+            DeprecationWarning,
+        )
+        return self._exception
+
+    @classmethod
+    def parse(
+        cls,
+        read_line: Callable[[int], Generator[None, None, bytes]],
+        read_exact: Callable[[int], Generator[None, None, bytes]],
+        read_to_eof: Callable[[int], Generator[None, None, bytes]],
+    ) -> Generator[None, None, Response]:
+        """
+        Parse a WebSocket handshake response.
+
+        This is a generator-based coroutine.
+
+        The reason phrase and headers are expected to contain only ASCII
+        characters. Other characters are represented with surrogate escapes.
+
+        Args:
+            read_line: generator-based coroutine that reads a LF-terminated
+                line or raises an exception if there isn't enough data.
+            read_exact: generator-based coroutine that reads the requested
+                bytes or raises an exception if there isn't enough data.
+            read_to_eof: generator-based coroutine that reads until the end
+                of the stream.
+
+        Raises:
+            EOFError: if the connection is closed without a full HTTP response.
+            SecurityError: if the response exceeds a security limit.
+            LookupError: if the response isn't well formatted.
+            ValueError: if the response isn't well formatted.
+
+        """
+        # https://www.rfc-editor.org/rfc/rfc7230.html#section-3.1.2
+
+        try:
+            status_line = yield from parse_line(read_line)
+        except EOFError as exc:
+            raise EOFError("connection closed while reading HTTP status line") from exc
+
+        try:
+            version, raw_status_code, raw_reason = status_line.split(b" ", 2)
+        except ValueError:  # not enough values to unpack (expected 3, got 1-2)
+            raise ValueError(f"invalid HTTP status line: {d(status_line)}") from None
+
+        if version != b"HTTP/1.1":
+            raise ValueError(f"unsupported HTTP version: {d(version)}")
+        try:
+            status_code = int(raw_status_code)
+        except ValueError:  # invalid literal for int() with base 10
+            raise ValueError(
+                f"invalid HTTP status code: {d(raw_status_code)}"
+            ) from None
+        if not 100 <= status_code < 1000:
+            raise ValueError(f"unsupported HTTP status code: {d(raw_status_code)}")
+        if not _value_re.fullmatch(raw_reason):
+            raise ValueError(f"invalid HTTP reason phrase: {d(raw_reason)}")
+        reason = raw_reason.decode()
+
+        headers = yield from parse_headers(read_line)
+
+        # https://www.rfc-editor.org/rfc/rfc7230.html#section-3.3.3
+
+        if "Transfer-Encoding" in headers:
+            raise NotImplementedError("transfer codings aren't supported")
+
+        # Since websockets only does GET requests (no HEAD, no CONNECT), all
+        # responses except 1xx, 204, and 304 include a message body.
+        if 100 <= status_code < 200 or status_code == 204 or status_code == 304:
+            body = None
+        else:
+            content_length: Optional[int]
+            try:
+                # MultipleValuesError is sufficiently unlikely that we don't
+                # attempt to handle it. Instead we document that its parent
+                # class, LookupError, may be raised.
+                raw_content_length = headers["Content-Length"]
+            except KeyError:
+                content_length = None
+            else:
+                content_length = int(raw_content_length)
+
+            if content_length is None:
+                try:
+                    body = yield from read_to_eof(MAX_BODY)
+                except RuntimeError:
+                    raise exceptions.SecurityError(
+                        f"body too large: over {MAX_BODY} bytes"
+                    )
+            elif content_length > MAX_BODY:
+                raise exceptions.SecurityError(
+                    f"body too large: {content_length} bytes"
+                )
+            else:
+                body = yield from read_exact(content_length)
+
+        return cls(status_code, reason, headers, body)
+
+    def serialize(self) -> bytes:
+        """
+        Serialize a WebSocket handshake response.
+
+        """
+        # Since the status line and headers only contain ASCII characters,
+        # we can keep this simple.
+        response = f"HTTP/1.1 {self.status_code} {self.reason_phrase}\r\n".encode()
+        response += self.headers.serialize()
+        if self.body is not None:
+            response += self.body
+        return response
+
+
+def parse_headers(
+    read_line: Callable[[int], Generator[None, None, bytes]],
+) -> Generator[None, None, datastructures.Headers]:
+    """
+    Parse HTTP headers.
+
+    Non-ASCII characters are represented with surrogate escapes.
+
+    Args:
+        read_line: generator-based coroutine that reads a LF-terminated line
+            or raises an exception if there isn't enough data.
+
+    Raises:
+        EOFError: if the connection is closed without complete headers.
+        SecurityError: if the request exceeds a security limit.
+        ValueError: if the request isn't well formatted.
+
+    """
+    # https://www.rfc-editor.org/rfc/rfc7230.html#section-3.2
+
+    # We don't attempt to support obsolete line folding.
+
+    headers = datastructures.Headers()
+    for _ in range(MAX_HEADERS + 1):
+        try:
+            line = yield from parse_line(read_line)
+        except EOFError as exc:
+            raise EOFError("connection closed while reading HTTP headers") from exc
+        if line == b"":
+            break
+
+        try:
+            raw_name, raw_value = line.split(b":", 1)
+        except ValueError:  # not enough values to unpack (expected 2, got 1)
+            raise ValueError(f"invalid HTTP header line: {d(line)}") from None
+        if not _token_re.fullmatch(raw_name):
+            raise ValueError(f"invalid HTTP header name: {d(raw_name)}")
+        raw_value = raw_value.strip(b" \t")
+        if not _value_re.fullmatch(raw_value):
+            raise ValueError(f"invalid HTTP header value: {d(raw_value)}")
+
+        name = raw_name.decode("ascii")  # guaranteed to be ASCII at this point
+        value = raw_value.decode("ascii", "surrogateescape")
+        headers[name] = value
+
+    else:
+        raise exceptions.SecurityError("too many HTTP headers")
+
+    return headers
+
+
+def parse_line(
+    read_line: Callable[[int], Generator[None, None, bytes]],
+) -> Generator[None, None, bytes]:
+    """
+    Parse a single line.
+
+    CRLF is stripped from the return value.
+
+    Args:
+        read_line: generator-based coroutine that reads a LF-terminated line
+            or raises an exception if there isn't enough data.
+
+    Raises:
+        EOFError: if the connection is closed without a CRLF.
+        SecurityError: if the response exceeds a security limit.
+
+    """
+    try:
+        line = yield from read_line(MAX_LINE)
+    except RuntimeError:
+        raise exceptions.SecurityError("line too long")
+    # Not mandatory but safe - https://www.rfc-editor.org/rfc/rfc7230.html#section-3.5
+    if not line.endswith(b"\r\n"):
+        raise EOFError("line without CRLF")
+    return line[:-2]

code/.venv/lib/python3.12/site-packages/websockets/imports.py

@@ -0,0 +1,99 @@
+from __future__ import annotations
+
+import warnings
+from typing import Any, Dict, Iterable, Optional
+
+
+__all__ = ["lazy_import"]
+
+
+def import_name(name: str, source: str, namespace: Dict[str, Any]) -> Any:
+    """
+    Import ``name`` from ``source`` in ``namespace``.
+
+    There are two use cases:
+
+    - ``name`` is an object defined in ``source``;
+    - ``name`` is a submodule of ``source``.
+
+    Neither :func:`__import__` nor :func:`~importlib.import_module` does
+    exactly this. :func:`__import__` is closer to the intended behavior.
+
+    """
+    level = 0
+    while source[level] == ".":
+        level += 1
+        assert level < len(source), "importing from parent isn't supported"
+    module = __import__(source[level:], namespace, None, [name], level)
+    return getattr(module, name)
+
+
+def lazy_import(
+    namespace: Dict[str, Any],
+    aliases: Optional[Dict[str, str]] = None,
+    deprecated_aliases: Optional[Dict[str, str]] = None,
+) -> None:
+    """
+    Provide lazy, module-level imports.
+
+    Typical use::
+
+        __getattr__, __dir__ = lazy_import(
+            globals(),
+            aliases={
+                "<name>": "<source module>",
+                ...
+            },
+            deprecated_aliases={
+                ...,
+            }
+        )
+
+    This function defines ``__getattr__`` and ``__dir__`` per :pep:`562`.
+
+    """
+    if aliases is None:
+        aliases = {}
+    if deprecated_aliases is None:
+        deprecated_aliases = {}
+
+    namespace_set = set(namespace)
+    aliases_set = set(aliases)
+    deprecated_aliases_set = set(deprecated_aliases)
+
+    assert not namespace_set & aliases_set, "namespace conflict"
+    assert not namespace_set & deprecated_aliases_set, "namespace conflict"
+    assert not aliases_set & deprecated_aliases_set, "namespace conflict"
+
+    package = namespace["__name__"]
+
+    def __getattr__(name: str) -> Any:
+        assert aliases is not None  # mypy cannot figure this out
+        try:
+            source = aliases[name]
+        except KeyError:
+            pass
+        else:
+            return import_name(name, source, namespace)
+
+        assert deprecated_aliases is not None  # mypy cannot figure this out
+        try:
+            source = deprecated_aliases[name]
+        except KeyError:
+            pass
+        else:
+            warnings.warn(
+                f"{package}.{name} is deprecated",
+                DeprecationWarning,
+                stacklevel=2,
+            )
+            return import_name(name, source, namespace)
+
+        raise AttributeError(f"module {package!r} has no attribute {name!r}")
+
+    namespace["__getattr__"] = __getattr__
+
+    def __dir__() -> Iterable[str]:
+        return sorted(namespace_set | aliases_set | deprecated_aliases_set)
+
+    namespace["__dir__"] = __dir__

code/.venv/lib/python3.12/site-packages/websockets/legacy/async_timeout.py

@@ -0,0 +1,265 @@
+# From https://github.com/aio-libs/async-timeout/blob/master/async_timeout/__init__.py
+# Licensed under the Apache License (Apache-2.0)
+
+import asyncio
+import enum
+import sys
+import warnings
+from types import TracebackType
+from typing import Optional, Type
+
+
+# From https://github.com/python/typing_extensions/blob/main/src/typing_extensions.py
+# Licensed under the Python Software Foundation License (PSF-2.0)
+
+if sys.version_info >= (3, 11):
+    from typing import final
+else:
+    # @final exists in 3.8+, but we backport it for all versions
+    # before 3.11 to keep support for the __final__ attribute.
+    # See https://bugs.python.org/issue46342
+    def final(f):
+        """This decorator can be used to indicate to type checkers that
+        the decorated method cannot be overridden, and decorated class
+        cannot be subclassed. For example:
+
+            class Base:
+                @final
+                def done(self) -> None:
+                    ...
+            class Sub(Base):
+                def done(self) -> None:  # Error reported by type checker
+                    ...
+            @final
+            class Leaf:
+                ...
+            class Other(Leaf):  # Error reported by type checker
+                ...
+
+        There is no runtime checking of these properties. The decorator
+        sets the ``__final__`` attribute to ``True`` on the decorated object
+        to allow runtime introspection.
+        """
+        try:
+            f.__final__ = True
+        except (AttributeError, TypeError):
+            # Skip the attribute silently if it is not writable.
+            # AttributeError happens if the object has __slots__ or a
+            # read-only property, TypeError if it's a builtin class.
+            pass
+        return f
+
+
+# End https://github.com/aio-libs/async-timeout/blob/master/async_timeout/__init__.py
+
+__version__ = "4.0.2"
+
+
+__all__ = ("timeout", "timeout_at", "Timeout")
+
+
+def timeout(delay: Optional[float]) -> "Timeout":
+    """timeout context manager.
+
+    Useful in cases when you want to apply timeout logic around block
+    of code or in cases when asyncio.wait_for is not suitable. For example:
+
+    >>> async with timeout(0.001):
+    ...     async with aiohttp.get('https://github.com') as r:
+    ...         await r.text()
+
+
+    delay - value in seconds or None to disable timeout logic
+    """
+    loop = asyncio.get_running_loop()
+    if delay is not None:
+        deadline = loop.time() + delay  # type: Optional[float]
+    else:
+        deadline = None
+    return Timeout(deadline, loop)
+
+
+def timeout_at(deadline: Optional[float]) -> "Timeout":
+    """Schedule the timeout at absolute time.
+
+    deadline argument points on the time in the same clock system
+    as loop.time().
+
+    Please note: it is not POSIX time but a time with
+    undefined starting base, e.g. the time of the system power on.
+
+    >>> async with timeout_at(loop.time() + 10):
+    ...     async with aiohttp.get('https://github.com') as r:
+    ...         await r.text()
+
+
+    """
+    loop = asyncio.get_running_loop()
+    return Timeout(deadline, loop)
+
+
+class _State(enum.Enum):
+    INIT = "INIT"
+    ENTER = "ENTER"
+    TIMEOUT = "TIMEOUT"
+    EXIT = "EXIT"
+
+
+@final
+class Timeout:
+    # Internal class, please don't instantiate it directly
+    # Use timeout() and timeout_at() public factories instead.
+    #
+    # Implementation note: `async with timeout()` is preferred
+    # over `with timeout()`.
+    # While technically the Timeout class implementation
+    # doesn't need to be async at all,
+    # the `async with` statement explicitly points that
+    # the context manager should be used from async function context.
+    #
+    # This design allows to avoid many silly misusages.
+    #
+    # TimeoutError is raised immediately when scheduled
+    # if the deadline is passed.
+    # The purpose is to time out as soon as possible
+    # without waiting for the next await expression.
+
+    __slots__ = ("_deadline", "_loop", "_state", "_timeout_handler")
+
+    def __init__(
+        self, deadline: Optional[float], loop: asyncio.AbstractEventLoop
+    ) -> None:
+        self._loop = loop
+        self._state = _State.INIT
+
+        self._timeout_handler = None  # type: Optional[asyncio.Handle]
+        if deadline is None:
+            self._deadline = None  # type: Optional[float]
+        else:
+            self.update(deadline)
+
+    def __enter__(self) -> "Timeout":
+        warnings.warn(
+            "with timeout() is deprecated, use async with timeout() instead",
+            DeprecationWarning,
+            stacklevel=2,
+        )
+        self._do_enter()
+        return self
+
+    def __exit__(
+        self,
+        exc_type: Optional[Type[BaseException]],
+        exc_val: Optional[BaseException],
+        exc_tb: Optional[TracebackType],
+    ) -> Optional[bool]:
+        self._do_exit(exc_type)
+        return None
+
+    async def __aenter__(self) -> "Timeout":
+        self._do_enter()
+        return self
+
+    async def __aexit__(
+        self,
+        exc_type: Optional[Type[BaseException]],
+        exc_val: Optional[BaseException],
+        exc_tb: Optional[TracebackType],
+    ) -> Optional[bool]:
+        self._do_exit(exc_type)
+        return None
+
+    @property
+    def expired(self) -> bool:
+        """Is timeout expired during execution?"""
+        return self._state == _State.TIMEOUT
+
+    @property
+    def deadline(self) -> Optional[float]:
+        return self._deadline
+
+    def reject(self) -> None:
+        """Reject scheduled timeout if any."""
+        # cancel is maybe better name but
+        # task.cancel() raises CancelledError in asyncio world.
+        if self._state not in (_State.INIT, _State.ENTER):
+            raise RuntimeError(f"invalid state {self._state.value}")
+        self._reject()
+
+    def _reject(self) -> None:
+        if self._timeout_handler is not None:
+            self._timeout_handler.cancel()
+            self._timeout_handler = None
+
+    def shift(self, delay: float) -> None:
+        """Advance timeout on delay seconds.
+
+        The delay can be negative.
+
+        Raise RuntimeError if shift is called when deadline is not scheduled
+        """
+        deadline = self._deadline
+        if deadline is None:
+            raise RuntimeError("cannot shift timeout if deadline is not scheduled")
+        self.update(deadline + delay)
+
+    def update(self, deadline: float) -> None:
+        """Set deadline to absolute value.
+
+        deadline argument points on the time in the same clock system
+        as loop.time().
+
+        If new deadline is in the past the timeout is raised immediately.
+
+        Please note: it is not POSIX time but a time with
+        undefined starting base, e.g. the time of the system power on.
+        """
+        if self._state == _State.EXIT:
+            raise RuntimeError("cannot reschedule after exit from context manager")
+        if self._state == _State.TIMEOUT:
+            raise RuntimeError("cannot reschedule expired timeout")
+        if self._timeout_handler is not None:
+            self._timeout_handler.cancel()
+        self._deadline = deadline
+        if self._state != _State.INIT:
+            self._reschedule()
+
+    def _reschedule(self) -> None:
+        assert self._state == _State.ENTER
+        deadline = self._deadline
+        if deadline is None:
+            return
+
+        now = self._loop.time()
+        if self._timeout_handler is not None:
+            self._timeout_handler.cancel()
+
+        task = asyncio.current_task()
+        if deadline <= now:
+            self._timeout_handler = self._loop.call_soon(self._on_timeout, task)
+        else:
+            self._timeout_handler = self._loop.call_at(deadline, self._on_timeout, task)
+
+    def _do_enter(self) -> None:
+        if self._state != _State.INIT:
+            raise RuntimeError(f"invalid state {self._state.value}")
+        self._state = _State.ENTER
+        self._reschedule()
+
+    def _do_exit(self, exc_type: Optional[Type[BaseException]]) -> None:
+        if exc_type is asyncio.CancelledError and self._state == _State.TIMEOUT:
+            self._timeout_handler = None
+            raise asyncio.TimeoutError
+        # timeout has not expired
+        self._state = _State.EXIT
+        self._reject()
+        return None
+
+    def _on_timeout(self, task: "asyncio.Task[None]") -> None:
+        task.cancel()
+        self._state = _State.TIMEOUT
+        # drop the reference early
+        self._timeout_handler = None
+
+
+# End https://github.com/aio-libs/async-timeout/blob/master/async_timeout/__init__.py

code/.venv/lib/python3.12/site-packages/websockets/legacy/auth.py

@@ -0,0 +1,184 @@
+from __future__ import annotations
+
+import functools
+import hmac
+import http
+from typing import Any, Awaitable, Callable, Iterable, Optional, Tuple, Union, cast
+
+from ..datastructures import Headers
+from ..exceptions import InvalidHeader
+from ..headers import build_www_authenticate_basic, parse_authorization_basic
+from .server import HTTPResponse, WebSocketServerProtocol
+
+
+__all__ = ["BasicAuthWebSocketServerProtocol", "basic_auth_protocol_factory"]
+
+Credentials = Tuple[str, str]
+
+
+def is_credentials(value: Any) -> bool:
+    try:
+        username, password = value
+    except (TypeError, ValueError):
+        return False
+    else:
+        return isinstance(username, str) and isinstance(password, str)
+
+
+class BasicAuthWebSocketServerProtocol(WebSocketServerProtocol):
+    """
+    WebSocket server protocol that enforces HTTP Basic Auth.
+
+    """
+
+    realm: str = ""
+    """
+    Scope of protection.
+
+    If provided, it should contain only ASCII characters because the
+    encoding of non-ASCII characters is undefined.
+    """
+
+    username: Optional[str] = None
+    """Username of the authenticated user."""
+
+    def __init__(
+        self,
+        *args: Any,
+        realm: Optional[str] = None,
+        check_credentials: Optional[Callable[[str, str], Awaitable[bool]]] = None,
+        **kwargs: Any,
+    ) -> None:
+        if realm is not None:
+            self.realm = realm  # shadow class attribute
+        self._check_credentials = check_credentials
+        super().__init__(*args, **kwargs)
+
+    async def check_credentials(self, username: str, password: str) -> bool:
+        """
+        Check whether credentials are authorized.
+
+        This coroutine may be overridden in a subclass, for example to
+        authenticate against a database or an external service.
+
+        Args:
+            username: HTTP Basic Auth username.
+            password: HTTP Basic Auth password.
+
+        Returns:
+            bool: :obj:`True` if the handshake should continue;
+            :obj:`False` if it should fail with an HTTP 401 error.
+
+        """
+        if self._check_credentials is not None:
+            return await self._check_credentials(username, password)
+
+        return False
+
+    async def process_request(
+        self,
+        path: str,
+        request_headers: Headers,
+    ) -> Optional[HTTPResponse]:
+        """
+        Check HTTP Basic Auth and return an HTTP 401 response if needed.
+
+        """
+        try:
+            authorization = request_headers["Authorization"]
+        except KeyError:
+            return (
+                http.HTTPStatus.UNAUTHORIZED,
+                [("WWW-Authenticate", build_www_authenticate_basic(self.realm))],
+                b"Missing credentials\n",
+            )
+
+        try:
+            username, password = parse_authorization_basic(authorization)
+        except InvalidHeader:
+            return (
+                http.HTTPStatus.UNAUTHORIZED,
+                [("WWW-Authenticate", build_www_authenticate_basic(self.realm))],
+                b"Unsupported credentials\n",
+            )
+
+        if not await self.check_credentials(username, password):
+            return (
+                http.HTTPStatus.UNAUTHORIZED,
+                [("WWW-Authenticate", build_www_authenticate_basic(self.realm))],
+                b"Invalid credentials\n",
+            )
+
+        self.username = username
+
+        return await super().process_request(path, request_headers)
+
+
+def basic_auth_protocol_factory(
+    realm: Optional[str] = None,
+    credentials: Optional[Union[Credentials, Iterable[Credentials]]] = None,
+    check_credentials: Optional[Callable[[str, str], Awaitable[bool]]] = None,
+    create_protocol: Optional[Callable[..., BasicAuthWebSocketServerProtocol]] = None,
+) -> Callable[..., BasicAuthWebSocketServerProtocol]:
+    """
+    Protocol factory that enforces HTTP Basic Auth.
+
+    :func:`basic_auth_protocol_factory` is designed to integrate with
+    :func:`~websockets.server.serve` like this::
+
+        websockets.serve(
+            ...,
+            create_protocol=websockets.basic_auth_protocol_factory(
+                realm="my dev server",
+                credentials=("hello", "iloveyou"),
+            )
+        )
+
+    Args:
+        realm: Scope of protection. It should contain only ASCII characters
+            because the encoding of non-ASCII characters is undefined.
+            Refer to section 2.2 of :rfc:`7235` for details.
+        credentials: Hard coded authorized credentials. It can be a
+            ``(username, password)`` pair or a list of such pairs.
+        check_credentials: Coroutine that verifies credentials.
+            It receives ``username`` and ``password`` arguments
+            and returns a :class:`bool`. One of ``credentials`` or
+            ``check_credentials`` must be provided but not both.
+        create_protocol: Factory that creates the protocol. By default, this
+            is :class:`BasicAuthWebSocketServerProtocol`. It can be replaced
+            by a subclass.
+    Raises:
+        TypeError: If the ``credentials`` or ``check_credentials`` argument is
+            wrong.
+
+    """
+    if (credentials is None) == (check_credentials is None):
+        raise TypeError("provide either credentials or check_credentials")
+
+    if credentials is not None:
+        if is_credentials(credentials):
+            credentials_list = [cast(Credentials, credentials)]
+        elif isinstance(credentials, Iterable):
+            credentials_list = list(credentials)
+            if not all(is_credentials(item) for item in credentials_list):
+                raise TypeError(f"invalid credentials argument: {credentials}")
+        else:
+            raise TypeError(f"invalid credentials argument: {credentials}")
+
+        credentials_dict = dict(credentials_list)
+
+        async def check_credentials(username: str, password: str) -> bool:
+            try:
+                expected_password = credentials_dict[username]
+            except KeyError:
+                return False
+            return hmac.compare_digest(expected_password, password)
+
+    if create_protocol is None:
+        create_protocol = BasicAuthWebSocketServerProtocol
+
+    return functools.partial(
+        create_protocol,
+        realm=realm,
+        check_credentials=check_credentials,
+    )

code/.venv/lib/python3.12/site-packages/websockets/legacy/client.py

@@ -0,0 +1,705 @@
+from __future__ import annotations
+
+import asyncio
+import functools
+import logging
+import random
+import urllib.parse
+import warnings
+from types import TracebackType
+from typing import (
+    Any,
+    AsyncIterator,
+    Callable,
+    Generator,
+    List,
+    Optional,
+    Sequence,
+    Tuple,
+    Type,
+    cast,
+)
+
+from ..datastructures import Headers, HeadersLike
+from ..exceptions import (
+    InvalidHandshake,
+    InvalidHeader,
+    InvalidMessage,
+    InvalidStatusCode,
+    NegotiationError,
+    RedirectHandshake,
+    SecurityError,
+)
+from ..extensions import ClientExtensionFactory, Extension
+from ..extensions.permessage_deflate import enable_client_permessage_deflate
+from ..headers import (
+    build_authorization_basic,
+    build_extension,
+    build_host,
+    build_subprotocol,
+    parse_extension,
+    parse_subprotocol,
+    validate_subprotocols,
+)
+from ..http import USER_AGENT
+from ..typing import ExtensionHeader, LoggerLike, Origin, Subprotocol
+from ..uri import WebSocketURI, parse_uri
+from .compatibility import asyncio_timeout
+from .handshake import build_request, check_response
+from .http import read_response
+from .protocol import WebSocketCommonProtocol
+
+
+__all__ = ["connect", "unix_connect", "WebSocketClientProtocol"]
+
+
+class WebSocketClientProtocol(WebSocketCommonProtocol):
+    """
+    WebSocket client connection.
+
+    :class:`WebSocketClientProtocol` provides :meth:`recv` and :meth:`send`
+    coroutines for receiving and sending messages.
+
+    It supports asynchronous iteration to receive incoming messages::
+
+        async for message in websocket:
+            await process(message)
+
+    The iterator exits normally when the connection is closed with close code
+    1000 (OK) or 1001 (going away) or without a close code. It raises
+    a :exc:`~websockets.exceptions.ConnectionClosedError` when the connection
+    is closed with any other code.
+
+    See :func:`connect` for the documentation of ``logger``, ``origin``,
+    ``extensions``, ``subprotocols``, ``extra_headers``, and
+    ``user_agent_header``.
+
+    See :class:`~websockets.legacy.protocol.WebSocketCommonProtocol` for the
+    documentation of ``ping_interval``, ``ping_timeout``, ``close_timeout``,
+    ``max_size``, ``max_queue``, ``read_limit``, and ``write_limit``.
+
+    """
+
+    is_client = True
+    side = "client"
+
+    def __init__(
+        self,
+        *,
+        logger: Optional[LoggerLike] = None,
+        origin: Optional[Origin] = None,
+        extensions: Optional[Sequence[ClientExtensionFactory]] = None,
+        subprotocols: Optional[Sequence[Subprotocol]] = None,
+        extra_headers: Optional[HeadersLike] = None,
+        user_agent_header: Optional[str] = USER_AGENT,
+        **kwargs: Any,
+    ) -> None:
+        if logger is None:
+            logger = logging.getLogger("websockets.client")
+        super().__init__(logger=logger, **kwargs)
+        self.origin = origin
+        self.available_extensions = extensions
+        self.available_subprotocols = subprotocols
+        self.extra_headers = extra_headers
+        self.user_agent_header = user_agent_header
+
+    def write_http_request(self, path: str, headers: Headers) -> None:
+        """
+        Write request line and headers to the HTTP request.
+
+        """
+        self.path = path
+        self.request_headers = headers
+
+        if self.debug:
+            self.logger.debug("> GET %s HTTP/1.1", path)
+            for key, value in headers.raw_items():
+                self.logger.debug("> %s: %s", key, value)
+
+        # Since the path and headers only contain ASCII characters,
+        # we can keep this simple.
+        request = f"GET {path} HTTP/1.1\r\n"
+        request += str(headers)
+
+        self.transport.write(request.encode())
+
+    async def read_http_response(self) -> Tuple[int, Headers]:
+        """
+        Read status line and headers from the HTTP response.
+
+        If the response contains a body, it may be read from ``self.reader``
+        after this coroutine returns.
+
+        Raises:
+            InvalidMessage: If the HTTP message is malformed or isn't an
+                HTTP/1.1 GET response.
+
+        """
+        try:
+            status_code, reason, headers = await read_response(self.reader)
+        except Exception as exc:
+            raise InvalidMessage("did not receive a valid HTTP response") from exc
+
+        if self.debug:
+            self.logger.debug("< HTTP/1.1 %d %s", status_code, reason)
+            for key, value in headers.raw_items():
+                self.logger.debug("< %s: %s", key, value)
+
+        self.response_headers = headers
+
+        return status_code, self.response_headers
+
+    @staticmethod
+    def process_extensions(
+        headers: Headers,
+        available_extensions: Optional[Sequence[ClientExtensionFactory]],
+    ) -> List[Extension]:
+        """
+        Handle the Sec-WebSocket-Extensions HTTP response header.
+
+        Check that each extension is supported, as well as its parameters.
+
+        Return the list of accepted extensions.
+
+        Raise :exc:`~websockets.exceptions.InvalidHandshake` to abort the
+        connection.
+
+        :rfc:`6455` leaves the rules up to the specification of each
+        :extension.
+
+        To provide this level of flexibility, for each extension accepted by
+        the server, we check for a match with each extension available in the
+        client configuration. If no match is found, an exception is raised.
+
+        If several variants of the same extension are accepted by the server,
+        it may be configured several times, which won't make sense in general.
+        Extensions must implement their own requirements. For this purpose,
+        the list of previously accepted extensions is provided.
+
+        Other requirements, for example related to mandatory extensions or the
+        order of extensions, may be implemented by overriding this method.
+
+        """
+        accepted_extensions: List[Extension] = []
+
+        header_values = headers.get_all("Sec-WebSocket-Extensions")
+
+        if header_values:
+            if available_extensions is None:
+                raise InvalidHandshake("no extensions supported")
+
+            parsed_header_values: List[ExtensionHeader] = sum(
+                [parse_extension(header_value) for header_value in header_values], []
+            )
+
+            for name, response_params in parsed_header_values:
+                for extension_factory in available_extensions:
+                    # Skip non-matching extensions based on their name.
+                    if extension_factory.name != name:
+                        continue
+
+                    # Skip non-matching extensions based on their params.
+                    try:
+                        extension = extension_factory.process_response_params(
+                            response_params, accepted_extensions
+                        )
+                    except NegotiationError:
+                        continue
+
+                    # Add matching extension to the final list.
+                    accepted_extensions.append(extension)
+
+                    # Break out of the loop once we have a match.
+                    break
+
+                # If we didn't break from the loop, no extension in our list
+                # matched what the server sent. Fail the connection.
+                else:
+                    raise NegotiationError(
+                        f"Unsupported extension: "
+                        f"name = {name}, params = {response_params}"
+                    )
+
+        return accepted_extensions
+
+    @staticmethod
+    def process_subprotocol(
+        headers: Headers, available_subprotocols: Optional[Sequence[Subprotocol]]
+    ) -> Optional[Subprotocol]:
+        """
+        Handle the Sec-WebSocket-Protocol HTTP response header.
+
+        Check that it contains exactly one supported subprotocol.
+
+        Return the selected subprotocol.
+
+        """
+        subprotocol: Optional[Subprotocol] = None
+
+        header_values = headers.get_all("Sec-WebSocket-Protocol")
+
+        if header_values:
+            if available_subprotocols is None:
+                raise InvalidHandshake("no subprotocols supported")
+
+            parsed_header_values: Sequence[Subprotocol] = sum(
+                [parse_subprotocol(header_value) for header_value in header_values], []
+            )
+
+            if len(parsed_header_values) > 1:
+                subprotocols = ", ".join(parsed_header_values)
+                raise InvalidHandshake(f"multiple subprotocols: {subprotocols}")
+
+            subprotocol = parsed_header_values[0]
+
+            if subprotocol not in available_subprotocols:
+                raise NegotiationError(f"unsupported subprotocol: {subprotocol}")
+
+        return subprotocol
+
+    async def handshake(
+        self,
+        wsuri: WebSocketURI,
+        origin: Optional[Origin] = None,
+        available_extensions: Optional[Sequence[ClientExtensionFactory]] = None,
+        available_subprotocols: Optional[Sequence[Subprotocol]] = None,
+        extra_headers: Optional[HeadersLike] = None,
+    ) -> None:
+        """
+        Perform the client side of the opening handshake.
+
+        Args:
+            wsuri: URI of the WebSocket server.
+            origin: Value of the ``Origin`` header.
+            extensions: List of supported extensions, in order in which they
+                should be negotiated and run.
+            subprotocols: List of supported subprotocols, in order of decreasing
+                preference.
+            extra_headers: Arbitrary HTTP headers to add to the handshake request.
+
+        Raises:
+            InvalidHandshake: If the handshake fails.
+
+        """
+        request_headers = Headers()
+
+        request_headers["Host"] = build_host(wsuri.host, wsuri.port, wsuri.secure)
+
+        if wsuri.user_info:
+            request_headers["Authorization"] = build_authorization_basic(
+                *wsuri.user_info
+            )
+
+        if origin is not None:
+            request_headers["Origin"] = origin
+
+        key = build_request(request_headers)
+
+        if available_extensions is not None:
+            extensions_header = build_extension(
+                [
+                    (extension_factory.name, extension_factory.get_request_params())
+                    for extension_factory in available_extensions
+                ]
+            )
+            request_headers["Sec-WebSocket-Extensions"] = extensions_header
+
+        if available_subprotocols is not None:
+            protocol_header = build_subprotocol(available_subprotocols)
+            request_headers["Sec-WebSocket-Protocol"] = protocol_header
+
+        if self.extra_headers is not None:
+            request_headers.update(self.extra_headers)
+
+        if self.user_agent_header is not None:
+            request_headers.setdefault("User-Agent", self.user_agent_header)
+
+        self.write_http_request(wsuri.resource_name, request_headers)
+
+        status_code, response_headers = await self.read_http_response()
+        if status_code in (301, 302, 303, 307, 308):
+            if "Location" not in response_headers:
+                raise InvalidHeader("Location")
+            raise RedirectHandshake(response_headers["Location"])
+        elif status_code != 101:
+            raise InvalidStatusCode(status_code, response_headers)
+
+        check_response(response_headers, key)
+
+        self.extensions = self.process_extensions(
+            response_headers, available_extensions
+        )
+
+        self.subprotocol = self.process_subprotocol(
+            response_headers, available_subprotocols
+        )
+
+        self.connection_open()
+
+
+class Connect:
+    """
+    Connect to the WebSocket server at ``uri``.
+
+    Awaiting :func:`connect` yields a :class:`WebSocketClientProtocol` which
+    can then be used to send and receive messages.
+
+    :func:`connect` can be used as a asynchronous context manager::
+
+        async with websockets.connect(...) as websocket:
+            ...
+
+    The connection is closed automatically when exiting the context.
+
+    :func:`connect` can be used as an infinite asynchronous iterator to
+    reconnect automatically on errors::
+
+        async for websocket in websockets.connect(...):
+            try:
+                ...
+            except websockets.ConnectionClosed:
+                continue
+
+    The connection is closed automatically after each iteration of the loop.
+
+    If an error occurs while establishing the connection, :func:`connect`
+    retries with exponential backoff. The backoff delay starts at three
+    seconds and increases up to one minute.
+
+    If an error occurs in the body of the loop, you can handle the exception
+    and :func:`connect` will reconnect with the next iteration; or you can
+    let the exception bubble up and break out of the loop. This lets you
+    decide which errors trigger a reconnection and which errors are fatal.
+
+    Args:
+        uri: URI of the WebSocket server.
+        create_protocol: Factory for the :class:`asyncio.Protocol` managing
+            the connection. It defaults to :class:`WebSocketClientProtocol`.
+            Set it to a wrapper or a subclass to customize connection handling.
+        logger: Logger for this client.
+            It defaults to ``logging.getLogger("websockets.client")``.
+            See the :doc:`logging guide <../../topics/logging>` for details.
+        compression: The "permessage-deflate" extension is enabled by default.
+            Set ``compression`` to :obj:`None` to disable it. See the
+            :doc:`compression guide <../../topics/compression>` for details.
+        origin: Value of the ``Origin`` header, for servers that require it.
+        extensions: List of supported extensions, in order in which they
+            should be negotiated and run.
+        subprotocols: List of supported subprotocols, in order of decreasing
+            preference.
+        extra_headers: Arbitrary HTTP headers to add to the handshake request.
+        user_agent_header: Value of  the ``User-Agent`` request header.
+            It defaults to ``"Python/x.y.z websockets/X.Y"``.
+            Setting it to :obj:`None` removes the header.
+        open_timeout: Timeout for opening the connection in seconds.
+            :obj:`None` disables the timeout.
+
+    See :class:`~websockets.legacy.protocol.WebSocketCommonProtocol` for the
+    documentation of ``ping_interval``, ``ping_timeout``, ``close_timeout``,
+    ``max_size``, ``max_queue``, ``read_limit``, and ``write_limit``.
+
+    Any other keyword arguments are passed the event loop's
+    :meth:`~asyncio.loop.create_connection` method.
+
+    For example:
+
+    * You can set ``ssl`` to a :class:`~ssl.SSLContext` to enforce TLS
+      settings. When connecting to a ``wss://`` URI, if ``ssl`` isn't
+      provided, a TLS context is created
+      with :func:`~ssl.create_default_context`.
+
+    * You can set ``host`` and ``port`` to connect to a different host and
+      port from those found in ``uri``. This only changes the destination of
+      the TCP connection. The host name from ``uri`` is still used in the TLS
+      handshake for secure connections and in the ``Host`` header.
+
+    Raises:
+        InvalidURI: If ``uri`` isn't a valid WebSocket URI.
+        OSError: If the TCP connection fails.
+        InvalidHandshake: If the opening handshake fails.
+        ~asyncio.TimeoutError: If the opening handshake times out.
+
+    """
+
+    MAX_REDIRECTS_ALLOWED = 10
+
+    def __init__(
+        self,
+        uri: str,
+        *,
+        create_protocol: Optional[Callable[..., WebSocketClientProtocol]] = None,
+        logger: Optional[LoggerLike] = None,
+        compression: Optional[str] = "deflate",
+        origin: Optional[Origin] = None,
+        extensions: Optional[Sequence[ClientExtensionFactory]] = None,
+        subprotocols: Optional[Sequence[Subprotocol]] = None,
+        extra_headers: Optional[HeadersLike] = None,
+        user_agent_header: Optional[str] = USER_AGENT,
+        open_timeout: Optional[float] = 10,
+        ping_interval: Optional[float] = 20,
+        ping_timeout: Optional[float] = 20,
+        close_timeout: Optional[float] = None,
+        max_size: Optional[int] = 2**20,
+        max_queue: Optional[int] = 2**5,
+        read_limit: int = 2**16,
+        write_limit: int = 2**16,
+        **kwargs: Any,
+    ) -> None:
+        # Backwards compatibility: close_timeout used to be called timeout.
+        timeout: Optional[float] = kwargs.pop("timeout", None)
+        if timeout is None:
+            timeout = 10
+        else:
+            warnings.warn("rename timeout to close_timeout", DeprecationWarning)
+        # If both are specified, timeout is ignored.
+        if close_timeout is None:
+            close_timeout = timeout
+
+        # Backwards compatibility: create_protocol used to be called klass.
+        klass: Optional[Type[WebSocketClientProtocol]] = kwargs.pop("klass", None)
+        if klass is None:
+            klass = WebSocketClientProtocol
+        else:
+            warnings.warn("rename klass to create_protocol", DeprecationWarning)
+        # If both are specified, klass is ignored.
+        if create_protocol is None:
+            create_protocol = klass
+
+        # Backwards compatibility: recv() used to return None on closed connections
+        legacy_recv: bool = kwargs.pop("legacy_recv", False)
+
+        # Backwards compatibility: the loop parameter used to be supported.
+        _loop: Optional[asyncio.AbstractEventLoop] = kwargs.pop("loop", None)
+        if _loop is None:
+            loop = asyncio.get_event_loop()
+        else:
+            loop = _loop
+            warnings.warn("remove loop argument", DeprecationWarning)
+
+        wsuri = parse_uri(uri)
+        if wsuri.secure:
+            kwargs.setdefault("ssl", True)
+        elif kwargs.get("ssl") is not None:
+            raise ValueError(
+                "connect() received a ssl argument for a ws:// URI, "
+                "use a wss:// URI to enable TLS"
+            )
+
+        if compression == "deflate":
+            extensions = enable_client_permessage_deflate(extensions)
+        elif compression is not None:
+            raise ValueError(f"unsupported compression: {compression}")
+
+        if subprotocols is not None:
+            validate_subprotocols(subprotocols)
+
+        factory = functools.partial(
+            create_protocol,
+            logger=logger,
+            origin=origin,
+            extensions=extensions,
+            subprotocols=subprotocols,
+            extra_headers=extra_headers,
+            user_agent_header=user_agent_header,
+            ping_interval=ping_interval,
+            ping_timeout=ping_timeout,
+            close_timeout=close_timeout,
+            max_size=max_size,
+            max_queue=max_queue,
+            read_limit=read_limit,
+            write_limit=write_limit,
+            host=wsuri.host,
+            port=wsuri.port,
+            secure=wsuri.secure,
+            legacy_recv=legacy_recv,
+            loop=_loop,
+        )
+
+        if kwargs.pop("unix", False):
+            path: Optional[str] = kwargs.pop("path", None)
+            create_connection = functools.partial(
+                loop.create_unix_connection, factory, path, **kwargs
+            )
+        else:
+            host: Optional[str]
+            port: Optional[int]
+            if kwargs.get("sock") is None:
+                host, port = wsuri.host, wsuri.port
+            else:
+                # If sock is given, host and port shouldn't be specified.
+                host, port = None, None
+                if kwargs.get("ssl"):
+                    kwargs.setdefault("server_hostname", wsuri.host)
+            # If host and port are given, override values from the URI.
+            host = kwargs.pop("host", host)
+            port = kwargs.pop("port", port)
+            create_connection = functools.partial(
+                loop.create_connection, factory, host, port, **kwargs
+            )
+
+        self.open_timeout = open_timeout
+        if logger is None:
+            logger = logging.getLogger("websockets.client")
+        self.logger = logger
+
+        # This is a coroutine function.
+        self._create_connection = create_connection
+        self._uri = uri
+        self._wsuri = wsuri
+
+    def handle_redirect(self, uri: str) -> None:
+        # Update the state of this instance to connect to a new URI.
+        old_uri = self._uri
+        old_wsuri = self._wsuri
+        new_uri = urllib.parse.urljoin(old_uri, uri)
+        new_wsuri = parse_uri(new_uri)
+
+        # Forbid TLS downgrade.
+        if old_wsuri.secure and not new_wsuri.secure:
+            raise SecurityError("redirect from WSS to WS")
+
+        same_origin = (
+            old_wsuri.host == new_wsuri.host and old_wsuri.port == new_wsuri.port
+        )
+
+        # Rewrite the host and port arguments for cross-origin redirects.
+        # This preserves connection overrides with the host and port
+        # arguments if the redirect points to the same host and port.
+        if not same_origin:
+            # Replace the host and port argument passed to the protocol factory.
+            factory = self._create_connection.args[0]
+            factory = functools.partial(
+                factory.func,
+                *factory.args,
+                **dict(factory.keywords, host=new_wsuri.host, port=new_wsuri.port),
+            )
+            # Replace the host and port argument passed to create_connection.
+            self._create_connection = functools.partial(
+                self._create_connection.func,
+                *(factory, new_wsuri.host, new_wsuri.port),
+                **self._create_connection.keywords,
+            )
+
+        # Set the new WebSocket URI. This suffices for same-origin redirects.
+        self._uri = new_uri
+        self._wsuri = new_wsuri
+
+    # async for ... in connect(...):
+
+    BACKOFF_MIN = 1.92
+    BACKOFF_MAX = 60.0
+    BACKOFF_FACTOR = 1.618
+    BACKOFF_INITIAL = 5
+
+    async def __aiter__(self) -> AsyncIterator[WebSocketClientProtocol]:
+        backoff_delay = self.BACKOFF_MIN
+        while True:
+            try:
+                async with self as protocol:
+                    yield protocol
+            except Exception:
+                # Add a random initial delay between 0 and 5 seconds.
+                # See 7.2.3. Recovering from Abnormal Closure in RFC 6544.
+                if backoff_delay == self.BACKOFF_MIN:
+                    initial_delay = random.random() * self.BACKOFF_INITIAL
+                    self.logger.info(
+                        "! connect failed; reconnecting in %.1f seconds",
+                        initial_delay,
+                        exc_info=True,
+                    )
+                    await asyncio.sleep(initial_delay)
+                else:
+                    self.logger.info(
+                        "! connect failed again; retrying in %d seconds",
+                        int(backoff_delay),
+                        exc_info=True,
+                    )
+                    await asyncio.sleep(int(backoff_delay))
+                # Increase delay with truncated exponential backoff.
+                backoff_delay = backoff_delay * self.BACKOFF_FACTOR
+                backoff_delay = min(backoff_delay, self.BACKOFF_MAX)
+                continue
+            else:
+                # Connection succeeded - reset backoff delay
+                backoff_delay = self.BACKOFF_MIN
+
+    # async with connect(...) as ...:
+
+    async def __aenter__(self) -> WebSocketClientProtocol:
+        return await self
+
+    async def __aexit__(
+        self,
+        exc_type: Optional[Type[BaseException]],
+        exc_value: Optional[BaseException],
+        traceback: Optional[TracebackType],
+    ) -> None:
+        await self.protocol.close()
+
+    # ... = await connect(...)
+
+    def __await__(self) -> Generator[Any, None, WebSocketClientProtocol]:
+        # Create a suitable iterator by calling __await__ on a coroutine.
+        return self.__await_impl_timeout__().__await__()
+
+    async def __await_impl_timeout__(self) -> WebSocketClientProtocol:
+        async with asyncio_timeout(self.open_timeout):
+            return await self.__await_impl__()
+
+    async def __await_impl__(self) -> WebSocketClientProtocol:
+        for redirects in range(self.MAX_REDIRECTS_ALLOWED):
+            _transport, _protocol = await self._create_connection()
+            protocol = cast(WebSocketClientProtocol, _protocol)
+            try:
+                await protocol.handshake(
+                    self._wsuri,
+                    origin=protocol.origin,
+                    available_extensions=protocol.available_extensions,
+                    available_subprotocols=protocol.available_subprotocols,
+                    extra_headers=protocol.extra_headers,
+                )
+            except RedirectHandshake as exc:
+                protocol.fail_connection()
+                await protocol.wait_closed()
+                self.handle_redirect(exc.uri)
+            # Avoid leaking a connected socket when the handshake fails.
+            except (Exception, asyncio.CancelledError):
+                protocol.fail_connection()
+                await protocol.wait_closed()
+                raise
+            else:
+                self.protocol = protocol
+                return protocol
+        else:
+            raise SecurityError("too many redirects")
+
+    # ... = yield from connect(...) - remove when dropping Python < 3.10
+
+    __iter__ = __await__
+
+
+connect = Connect
+
+
+def unix_connect(
+    path: Optional[str] = None,
+    uri: str = "ws://localhost/",
+    **kwargs: Any,
+) -> Connect:
+    """
+    Similar to :func:`connect`, but for connecting to a Unix socket.
+
+    This function builds upon the event loop's
+    :meth:`~asyncio.loop.create_unix_connection` method.
+
+    It is only available on Unix.
+
+    It's mainly useful for debugging servers listening on Unix sockets.
+
+    Args:
+        path: File system path to the Unix socket.
+        uri: URI of the WebSocket server; the host is used in the TLS
+            handshake for secure connections and in the ``Host`` header.
+
+    """
+    return connect(uri=uri, path=path, unix=True, **kwargs)

code/.venv/lib/python3.12/site-packages/websockets/legacy/compatibility.py

@@ -0,0 +1,12 @@
+from __future__ import annotations
+
+import sys
+
+
+__all__ = ["asyncio_timeout"]
+
+
+if sys.version_info[:2] >= (3, 11):
+    from asyncio import timeout as asyncio_timeout  # noqa: F401
+else:
+    from .async_timeout import timeout as asyncio_timeout  # noqa: F401

code/.venv/lib/python3.12/site-packages/websockets/legacy/framing.py

@@ -0,0 +1,176 @@
+from __future__ import annotations
+
+import struct
+from typing import Any, Awaitable, Callable, NamedTuple, Optional, Sequence, Tuple
+
+from .. import extensions, frames
+from ..exceptions import PayloadTooBig, ProtocolError
+
+
+try:
+    from ..speedups import apply_mask
+except ImportError:
+    from ..utils import apply_mask
+
+
+class Frame(NamedTuple):
+    fin: bool
+    opcode: frames.Opcode
+    data: bytes
+    rsv1: bool = False
+    rsv2: bool = False
+    rsv3: bool = False
+
+    @property
+    def new_frame(self) -> frames.Frame:
+        return frames.Frame(
+            self.opcode,
+            self.data,
+            self.fin,
+            self.rsv1,
+            self.rsv2,
+            self.rsv3,
+        )
+
+    def __str__(self) -> str:
+        return str(self.new_frame)
+
+    def check(self) -> None:
+        return self.new_frame.check()
+
+    @classmethod
+    async def read(
+        cls,
+        reader: Callable[[int], Awaitable[bytes]],
+        *,
+        mask: bool,
+        max_size: Optional[int] = None,
+        extensions: Optional[Sequence[extensions.Extension]] = None,
+    ) -> Frame:
+        """
+        Read a WebSocket frame.
+
+        Args:
+            reader: Coroutine that reads exactly the requested number of
+                bytes, unless the end of file is reached.
+            mask: Whether the frame should be masked i.e. whether the read
+                happens on the server side.
+            max_size: Maximum payload size in bytes.
+            extensions: List of extensions, applied in reverse order.
+
+        Raises:
+            PayloadTooBig: If the frame exceeds ``max_size``.
+            ProtocolError: If the frame contains incorrect values.
+
+        """
+
+        # Read the header.
+        data = await reader(2)
+        head1, head2 = struct.unpack("!BB", data)
+
+        # While not Pythonic, this is marginally faster than calling bool().
+        fin = True if head1 & 0b10000000 else False
+        rsv1 = True if head1 & 0b01000000 else False
+        rsv2 = True if head1 & 0b00100000 else False
+        rsv3 = True if head1 & 0b00010000 else False
+
+        try:
+            opcode = frames.Opcode(head1 & 0b00001111)
+        except ValueError as exc:
+            raise ProtocolError("invalid opcode") from exc
+
+        if (True if head2 & 0b10000000 else False) != mask:
+            raise ProtocolError("incorrect masking")
+
+        length = head2 & 0b01111111
+        if length == 126:
+            data = await reader(2)
+            (length,) = struct.unpack("!H", data)
+        elif length == 127:
+            data = await reader(8)
+            (length,) = struct.unpack("!Q", data)
+        if max_size is not None and length > max_size:
+            raise PayloadTooBig(f"over size limit ({length} > {max_size} bytes)")
+        if mask:
+            mask_bits = await reader(4)
+
+        # Read the data.
+        data = await reader(length)
+        if mask:
+            data = apply_mask(data, mask_bits)
+
+        new_frame = frames.Frame(opcode, data, fin, rsv1, rsv2, rsv3)
+
+        if extensions is None:
+            extensions = []
+        for extension in reversed(extensions):
+            new_frame = extension.decode(new_frame, max_size=max_size)
+
+        new_frame.check()
+
+        return cls(
+            new_frame.fin,
+            new_frame.opcode,
+            new_frame.data,
+            new_frame.rsv1,
+            new_frame.rsv2,
+            new_frame.rsv3,
+        )
+
+    def write(
+        self,
+        write: Callable[[bytes], Any],
+        *,
+        mask: bool,
+        extensions: Optional[Sequence[extensions.Extension]] = None,
+    ) -> None:
+        """
+        Write a WebSocket frame.
+
+        Args:
+            frame: Frame to write.
+            write: Function that writes bytes.
+            mask: Whether the frame should be masked i.e. whether the write
+                happens on the client side.
+            extensions: List of extensions, applied in order.
+
+        Raises:
+            ProtocolError: If the frame contains incorrect values.
+
+        """
+        # The frame is written in a single call to write in order to prevent
+        # TCP fragmentation. See #68 for details. This also makes it safe to
+        # send frames concurrently from multiple coroutines.
+        write(self.new_frame.serialize(mask=mask, extensions=extensions))
+
+
+# Backwards compatibility with previously documented public APIs
+from ..frames import (  # noqa: E402, F401, I001
+    Close,
+    prepare_ctrl as encode_data,
+    prepare_data,
+)
+
+
+def parse_close(data: bytes) -> Tuple[int, str]:
+    """
+    Parse the payload from a close frame.
+
+    Returns:
+        Close code and reason.
+
+    Raises:
+        ProtocolError: If data is ill-formed.
+        UnicodeDecodeError: If the reason isn't valid UTF-8.
+
+    """
+    close = Close.parse(data)
+    return close.code, close.reason
+
+
+def serialize_close(code: int, reason: str) -> bytes:
+    """
+    Serialize the payload for a close frame.
+
+    """
+    return Close(code, reason).serialize()

code/.venv/lib/python3.12/site-packages/websockets/legacy/handshake.py

@@ -0,0 +1,165 @@
+from __future__ import annotations
+
+import base64
+import binascii
+from typing import List
+
+from ..datastructures import Headers, MultipleValuesError
+from ..exceptions import InvalidHeader, InvalidHeaderValue, InvalidUpgrade
+from ..headers import parse_connection, parse_upgrade
+from ..typing import ConnectionOption, UpgradeProtocol
+from ..utils import accept_key as accept, generate_key
+
+
+__all__ = ["build_request", "check_request", "build_response", "check_response"]
+
+
+def build_request(headers: Headers) -> str:
+    """
+    Build a handshake request to send to the server.
+
+    Update request headers passed in argument.
+
+    Args:
+        headers: Handshake request headers.
+
+    Returns:
+        str: ``key`` that must be passed to :func:`check_response`.
+
+    """
+    key = generate_key()
+    headers["Upgrade"] = "websocket"
+    headers["Connection"] = "Upgrade"
+    headers["Sec-WebSocket-Key"] = key
+    headers["Sec-WebSocket-Version"] = "13"
+    return key
+
+
+def check_request(headers: Headers) -> str:
+    """
+    Check a handshake request received from the client.
+
+    This function doesn't verify that the request is an HTTP/1.1 or higher GET
+    request and doesn't perform ``Host`` and ``Origin`` checks. These controls
+    are usually performed earlier in the HTTP request handling code. They're
+    the responsibility of the caller.
+
+    Args:
+        headers: Handshake request headers.
+
+    Returns:
+        str: ``key`` that must be passed to :func:`build_response`.
+
+    Raises:
+        InvalidHandshake: If the handshake request is invalid.
+            Then, the server must return a 400 Bad Request error.
+
+    """
+    connection: List[ConnectionOption] = sum(
+        [parse_connection(value) for value in headers.get_all("Connection")], []
+    )
+
+    if not any(value.lower() == "upgrade" for value in connection):
+        raise InvalidUpgrade("Connection", ", ".join(connection))
+
+    upgrade: List[UpgradeProtocol] = sum(
+        [parse_upgrade(value) for value in headers.get_all("Upgrade")], []
+    )
+
+    # For compatibility with non-strict implementations, ignore case when
+    # checking the Upgrade header. The RFC always uses "websocket", except
+    # in section 11.2. (IANA registration) where it uses "WebSocket".
+    if not (len(upgrade) == 1 and upgrade[0].lower() == "websocket"):
+        raise InvalidUpgrade("Upgrade", ", ".join(upgrade))
+
+    try:
+        s_w_key = headers["Sec-WebSocket-Key"]
+    except KeyError as exc:
+        raise InvalidHeader("Sec-WebSocket-Key") from exc
+    except MultipleValuesError as exc:
+        raise InvalidHeader(
+            "Sec-WebSocket-Key", "more than one Sec-WebSocket-Key header found"
+        ) from exc
+
+    try:
+        raw_key = base64.b64decode(s_w_key.encode(), validate=True)
+    except binascii.Error as exc:
+        raise InvalidHeaderValue("Sec-WebSocket-Key", s_w_key) from exc
+    if len(raw_key) != 16:
+        raise InvalidHeaderValue("Sec-WebSocket-Key", s_w_key)
+
+    try:
+        s_w_version = headers["Sec-WebSocket-Version"]
+    except KeyError as exc:
+        raise InvalidHeader("Sec-WebSocket-Version") from exc
+    except MultipleValuesError as exc:
+        raise InvalidHeader(
+            "Sec-WebSocket-Version", "more than one Sec-WebSocket-Version header found"
+        ) from exc
+
+    if s_w_version != "13":
+        raise InvalidHeaderValue("Sec-WebSocket-Version", s_w_version)
+
+    return s_w_key
+
+
+def build_response(headers: Headers, key: str) -> None:
+    """
+    Build a handshake response to send to the client.
+
+    Update response headers passed in argument.
+
+    Args:
+        headers: Handshake response headers.
+        key: Returned by :func:`check_request`.
+
+    """
+    headers["Upgrade"] = "websocket"
+    headers["Connection"] = "Upgrade"
+    headers["Sec-WebSocket-Accept"] = accept(key)
+
+
+def check_response(headers: Headers, key: str) -> None:
+    """
+    Check a handshake response received from the server.
+
+    This function doesn't verify that the response is an HTTP/1.1 or higher
+    response with a 101 status code. These controls are the responsibility of
+    the caller.
+
+    Args:
+        headers: Handshake response headers.
+        key: Returned by :func:`build_request`.
+
+    Raises:
+        InvalidHandshake: If the handshake response is invalid.
+
+    """
+    connection: List[ConnectionOption] = sum(
+        [parse_connection(value) for value in headers.get_all("Connection")], []
+    )
+
+    if not any(value.lower() == "upgrade" for value in connection):
+        raise InvalidUpgrade("Connection", " ".join(connection))
+
+    upgrade: List[UpgradeProtocol] = sum(
+        [parse_upgrade(value) for value in headers.get_all("Upgrade")], []
+    )
+
+    # For compatibility with non-strict implementations, ignore case when
+    # checking the Upgrade header. The RFC always uses "websocket", except
+    # in section 11.2. (IANA registration) where it uses "WebSocket".
+    if not (len(upgrade) == 1 and upgrade[0].lower() == "websocket"):
+        raise InvalidUpgrade("Upgrade", ", ".join(upgrade))
+
+    try:
+        s_w_accept = headers["Sec-WebSocket-Accept"]
+    except KeyError as exc:
+        raise InvalidHeader("Sec-WebSocket-Accept") from exc
+    except MultipleValuesError as exc:
+        raise InvalidHeader(
+            "Sec-WebSocket-Accept", "more than one Sec-WebSocket-Accept header found"
+        ) from exc
+
+    if s_w_accept != accept(key):
+        raise InvalidHeaderValue("Sec-WebSocket-Accept", s_w_accept)

code/.venv/lib/python3.12/site-packages/websockets/legacy/http.py

@@ -0,0 +1,201 @@
+from __future__ import annotations
+
+import asyncio
+import re
+from typing import Tuple
+
+from ..datastructures import Headers
+from ..exceptions import SecurityError
+
+
+__all__ = ["read_request", "read_response"]
+
+MAX_HEADERS = 128
+MAX_LINE = 8192
+
+
+def d(value: bytes) -> str:
+    """
+    Decode a bytestring for interpolating into an error message.
+
+    """
+    return value.decode(errors="backslashreplace")
+
+
+# See https://www.rfc-editor.org/rfc/rfc7230.html#appendix-B.
+
+# Regex for validating header names.
+
+_token_re = re.compile(rb"[-!#$%&\'*+.^_`|~0-9a-zA-Z]+")
+
+# Regex for validating header values.
+
+# We don't attempt to support obsolete line folding.
+
+# Include HTAB (\x09), SP (\x20), VCHAR (\x21-\x7e), obs-text (\x80-\xff).
+
+# The ABNF is complicated because it attempts to express that optional
+# whitespace is ignored. We strip whitespace and don't revalidate that.
+
+# See also https://www.rfc-editor.org/errata_search.php?rfc=7230&eid=4189
+
+_value_re = re.compile(rb"[\x09\x20-\x7e\x80-\xff]*")
+
+
+async def read_request(stream: asyncio.StreamReader) -> Tuple[str, Headers]:
+    """
+    Read an HTTP/1.1 GET request and return ``(path, headers)``.
+
+    ``path`` isn't URL-decoded or validated in any way.
+
+    ``path`` and ``headers`` are expected to contain only ASCII characters.
+    Other characters are represented with surrogate escapes.
+
+    :func:`read_request` doesn't attempt to read the request body because
+    WebSocket handshake requests don't have one. If the request contains a
+    body, it may be read from ``stream`` after this coroutine returns.
+
+    Args:
+        stream: Input to read the request from.
+
+    Raises:
+        EOFError: If the connection is closed without a full HTTP request.
+        SecurityError: If the request exceeds a security limit.
+        ValueError: If the request isn't well formatted.
+
+    """
+    # https://www.rfc-editor.org/rfc/rfc7230.html#section-3.1.1
+
+    # Parsing is simple because fixed values are expected for method and
+    # version and because path isn't checked. Since WebSocket software tends
+    # to implement HTTP/1.1 strictly, there's little need for lenient parsing.
+
+    try:
+        request_line = await read_line(stream)
+    except EOFError as exc:
+        raise EOFError("connection closed while reading HTTP request line") from exc
+
+    try:
+        method, raw_path, version = request_line.split(b" ", 2)
+    except ValueError:  # not enough values to unpack (expected 3, got 1-2)
+        raise ValueError(f"invalid HTTP request line: {d(request_line)}") from None
+
+    if method != b"GET":
+        raise ValueError(f"unsupported HTTP method: {d(method)}")
+    if version != b"HTTP/1.1":
+        raise ValueError(f"unsupported HTTP version: {d(version)}")
+    path = raw_path.decode("ascii", "surrogateescape")
+
+    headers = await read_headers(stream)
+
+    return path, headers
+
+
+async def read_response(stream: asyncio.StreamReader) -> Tuple[int, str, Headers]:
+    """
+    Read an HTTP/1.1 response and return ``(status_code, reason, headers)``.
+
+    ``reason`` and ``headers`` are expected to contain only ASCII characters.
+    Other characters are represented with surrogate escapes.
+
+    :func:`read_request` doesn't attempt to read the response body because
+    WebSocket handshake responses don't have one. If the response contains a
+    body, it may be read from ``stream`` after this coroutine returns.
+
+    Args:
+        stream: Input to read the response from.
+
+    Raises:
+        EOFError: If the connection is closed without a full HTTP response.
+        SecurityError: If the response exceeds a security limit.
+        ValueError: If the response isn't well formatted.
+
+    """
+    # https://www.rfc-editor.org/rfc/rfc7230.html#section-3.1.2
+
+    # As in read_request, parsing is simple because a fixed value is expected
+    # for version, status_code is a 3-digit number, and reason can be ignored.
+
+    try:
+        status_line = await read_line(stream)
+    except EOFError as exc:
+        raise EOFError("connection closed while reading HTTP status line") from exc
+
+    try:
+        version, raw_status_code, raw_reason = status_line.split(b" ", 2)
+    except ValueError:  # not enough values to unpack (expected 3, got 1-2)
+        raise ValueError(f"invalid HTTP status line: {d(status_line)}") from None
+
+    if version != b"HTTP/1.1":
+        raise ValueError(f"unsupported HTTP version: {d(version)}")
+    try:
+        status_code = int(raw_status_code)
+    except ValueError:  # invalid literal for int() with base 10
+        raise ValueError(f"invalid HTTP status code: {d(raw_status_code)}") from None
+    if not 100 <= status_code < 1000:
+        raise ValueError(f"unsupported HTTP status code: {d(raw_status_code)}")
+    if not _value_re.fullmatch(raw_reason):
+        raise ValueError(f"invalid HTTP reason phrase: {d(raw_reason)}")
+    reason = raw_reason.decode()
+
+    headers = await read_headers(stream)
+
+    return status_code, reason, headers
+
+
+async def read_headers(stream: asyncio.StreamReader) -> Headers:
+    """
+    Read HTTP headers from ``stream``.
+
+    Non-ASCII characters are represented with surrogate escapes.
+
+    """
+    # https://www.rfc-editor.org/rfc/rfc7230.html#section-3.2
+
+    # We don't attempt to support obsolete line folding.
+
+    headers = Headers()
+    for _ in range(MAX_HEADERS + 1):
+        try:
+            line = await read_line(stream)
+        except EOFError as exc:
+            raise EOFError("connection closed while reading HTTP headers") from exc
+        if line == b"":
+            break
+
+        try:
+            raw_name, raw_value = line.split(b":", 1)
+        except ValueError:  # not enough values to unpack (expected 2, got 1)
+            raise ValueError(f"invalid HTTP header line: {d(line)}") from None
+        if not _token_re.fullmatch(raw_name):
+            raise ValueError(f"invalid HTTP header name: {d(raw_name)}")
+        raw_value = raw_value.strip(b" \t")
+        if not _value_re.fullmatch(raw_value):
+            raise ValueError(f"invalid HTTP header value: {d(raw_value)}")
+
+        name = raw_name.decode("ascii")  # guaranteed to be ASCII at this point
+        value = raw_value.decode("ascii", "surrogateescape")
+        headers[name] = value
+
+    else:
+        raise SecurityError("too many HTTP headers")
+
+    return headers
+
+
+async def read_line(stream: asyncio.StreamReader) -> bytes:
+    """
+    Read a single line from ``stream``.
+
+    CRLF is stripped from the return value.
+
+    """
+    # Security: this is bounded by the StreamReader's limit (default = 32 KiB).
+    line = await stream.readline()
+    # Security: this guarantees header values are small (hard-coded = 8 KiB)
+    if len(line) > MAX_LINE:
+        raise SecurityError("line too long")
+    # Not mandatory but safe - https://www.rfc-editor.org/rfc/rfc7230.html#section-3.5
+    if not line.endswith(b"\r\n"):
+        raise EOFError("line without CRLF")
+    return line[:-2]

code/.venv/lib/python3.12/site-packages/websockets/protocol.py

@@ -0,0 +1,708 @@
+from __future__ import annotations
+
+import enum
+import logging
+import uuid
+from typing import Generator, List, Optional, Type, Union
+
+from .exceptions import (
+    ConnectionClosed,
+    ConnectionClosedError,
+    ConnectionClosedOK,
+    InvalidState,
+    PayloadTooBig,
+    ProtocolError,
+)
+from .extensions import Extension
+from .frames import (
+    OK_CLOSE_CODES,
+    OP_BINARY,
+    OP_CLOSE,
+    OP_CONT,
+    OP_PING,
+    OP_PONG,
+    OP_TEXT,
+    Close,
+    CloseCode,
+    Frame,
+)
+from .http11 import Request, Response
+from .streams import StreamReader
+from .typing import LoggerLike, Origin, Subprotocol
+
+
+__all__ = [
+    "Protocol",
+    "Side",
+    "State",
+    "SEND_EOF",
+]
+
+Event = Union[Request, Response, Frame]
+"""Events that :meth:`~Protocol.events_received` may return."""
+
+
+class Side(enum.IntEnum):
+    """A WebSocket connection is either a server or a client."""
+
+    SERVER, CLIENT = range(2)
+
+
+SERVER = Side.SERVER
+CLIENT = Side.CLIENT
+
+
+class State(enum.IntEnum):
+    """A WebSocket connection is in one of these four states."""
+
+    CONNECTING, OPEN, CLOSING, CLOSED = range(4)
+
+
+CONNECTING = State.CONNECTING
+OPEN = State.OPEN
+CLOSING = State.CLOSING
+CLOSED = State.CLOSED
+
+
+SEND_EOF = b""
+"""Sentinel signaling that the TCP connection must be half-closed."""
+
+
+class Protocol:
+    """
+    Sans-I/O implementation of a WebSocket connection.
+
+    Args:
+        side: :attr:`~Side.CLIENT` or :attr:`~Side.SERVER`.
+        state: initial state of the WebSocket connection.
+        max_size: maximum size of incoming messages in bytes;
+            :obj:`None` disables the limit.
+        logger: logger for this connection; depending on ``side``,
+            defaults to ``logging.getLogger("websockets.client")``
+            or ``logging.getLogger("websockets.server")``;
+            see the :doc:`logging guide <../../topics/logging>` for details.
+
+    """
+
+    def __init__(
+        self,
+        side: Side,
+        *,
+        state: State = OPEN,
+        max_size: Optional[int] = 2**20,
+        logger: Optional[LoggerLike] = None,
+    ) -> None:
+        # Unique identifier. For logs.
+        self.id: uuid.UUID = uuid.uuid4()
+        """Unique identifier of the connection. Useful in logs."""
+
+        # Logger or LoggerAdapter for this connection.
+        if logger is None:
+            logger = logging.getLogger(f"websockets.{side.name.lower()}")
+        self.logger: LoggerLike = logger
+        """Logger for this connection."""
+
+        # Track if DEBUG is enabled. Shortcut logging calls if it isn't.
+        self.debug = logger.isEnabledFor(logging.DEBUG)
+
+        # Connection side. CLIENT or SERVER.
+        self.side = side
+
+        # Connection state. Initially OPEN because subclasses handle CONNECTING.
+        self.state = state
+
+        # Maximum size of incoming messages in bytes.
+        self.max_size = max_size
+
+        # Current size of incoming message in bytes. Only set while reading a
+        # fragmented message i.e. a data frames with the FIN bit not set.
+        self.cur_size: Optional[int] = None
+
+        # True while sending a fragmented message i.e. a data frames with the
+        # FIN bit not set.
+        self.expect_continuation_frame = False
+
+        # WebSocket protocol parameters.
+        self.origin: Optional[Origin] = None
+        self.extensions: List[Extension] = []
+        self.subprotocol: Optional[Subprotocol] = None
+
+        # Close code and reason, set when a close frame is sent or received.
+        self.close_rcvd: Optional[Close] = None
+        self.close_sent: Optional[Close] = None
+        self.close_rcvd_then_sent: Optional[bool] = None
+
+        # Track if an exception happened during the handshake.
+        self.handshake_exc: Optional[Exception] = None
+        """
+        Exception to raise if the opening handshake failed.
+
+        :obj:`None` if the opening handshake succeeded.
+
+        """
+
+        # Track if send_eof() was called.
+        self.eof_sent = False
+
+        # Parser state.
+        self.reader = StreamReader()
+        self.events: List[Event] = []
+        self.writes: List[bytes] = []
+        self.parser = self.parse()
+        next(self.parser)  # start coroutine
+        self.parser_exc: Optional[Exception] = None
+
+    @property
+    def state(self) -> State:
+        """
+        WebSocket connection state.
+
+        Defined in 4.1, 4.2, 7.1.3, and 7.1.4 of :rfc:`6455`.
+
+        """
+        return self._state
+
+    @state.setter
+    def state(self, state: State) -> None:
+        if self.debug:
+            self.logger.debug("= connection is %s", state.name)
+        self._state = state
+
+    @property
+    def close_code(self) -> Optional[int]:
+        """
+        `WebSocket close code`_.
+
+        .. _WebSocket close code:
+            https://www.rfc-editor.org/rfc/rfc6455.html#section-7.1.5
+
+        :obj:`None` if the connection isn't closed yet.
+
+        """
+        if self.state is not CLOSED:
+            return None
+        elif self.close_rcvd is None:
+            return CloseCode.ABNORMAL_CLOSURE
+        else:
+            return self.close_rcvd.code
+
+    @property
+    def close_reason(self) -> Optional[str]:
+        """
+        `WebSocket close reason`_.
+
+        .. _WebSocket close reason:
+            https://www.rfc-editor.org/rfc/rfc6455.html#section-7.1.6
+
+        :obj:`None` if the connection isn't closed yet.
+
+        """
+        if self.state is not CLOSED:
+            return None
+        elif self.close_rcvd is None:
+            return ""
+        else:
+            return self.close_rcvd.reason
+
+    @property
+    def close_exc(self) -> ConnectionClosed:
+        """
+        Exception to raise when trying to interact with a closed connection.
+
+        Don't raise this exception while the connection :attr:`state`
+        is :attr:`~websockets.protocol.State.CLOSING`; wait until
+        it's :attr:`~websockets.protocol.State.CLOSED`.
+
+        Indeed, the exception includes the close code and reason, which are
+        known only once the connection is closed.
+
+        Raises:
+            AssertionError: if the connection isn't closed yet.
+
+        """
+        assert self.state is CLOSED, "connection isn't closed yet"
+        exc_type: Type[ConnectionClosed]
+        if (
+            self.close_rcvd is not None
+            and self.close_sent is not None
+            and self.close_rcvd.code in OK_CLOSE_CODES
+            and self.close_sent.code in OK_CLOSE_CODES
+        ):
+            exc_type = ConnectionClosedOK
+        else:
+            exc_type = ConnectionClosedError
+        exc: ConnectionClosed = exc_type(
+            self.close_rcvd,
+            self.close_sent,
+            self.close_rcvd_then_sent,
+        )
+        # Chain to the exception raised in the parser, if any.
+        exc.__cause__ = self.parser_exc
+        return exc
+
+    # Public methods for receiving data.
+
+    def receive_data(self, data: bytes) -> None:
+        """
+        Receive data from the network.
+
+        After calling this method:
+
+        - You must call :meth:`data_to_send` and send this data to the network.
+        - You should call :meth:`events_received` and process resulting events.
+
+        Raises:
+            EOFError: if :meth:`receive_eof` was called earlier.
+
+        """
+        self.reader.feed_data(data)
+        next(self.parser)
+
+    def receive_eof(self) -> None:
+        """
+        Receive the end of the data stream from the network.
+
+        After calling this method:
+
+        - You must call :meth:`data_to_send` and send this data to the network;
+          it will return ``[b""]``, signaling the end of the stream, or ``[]``.
+        - You aren't expected to call :meth:`events_received`; it won't return
+          any new events.
+
+        Raises:
+            EOFError: if :meth:`receive_eof` was called earlier.
+
+        """
+        self.reader.feed_eof()
+        next(self.parser)
+
+    # Public methods for sending events.
+
+    def send_continuation(self, data: bytes, fin: bool) -> None:
+        """
+        Send a `Continuation frame`_.
+
+        .. _Continuation frame:
+            https://datatracker.ietf.org/doc/html/rfc6455#section-5.6
+
+        Parameters:
+            data: payload containing the same kind of data
+                as the initial frame.
+            fin: FIN bit; set it to :obj:`True` if this is the last frame
+                of a fragmented message and to :obj:`False` otherwise.
+
+        Raises:
+            ProtocolError: if a fragmented message isn't in progress.
+
+        """
+        if not self.expect_continuation_frame:
+            raise ProtocolError("unexpected continuation frame")
+        self.expect_continuation_frame = not fin
+        self.send_frame(Frame(OP_CONT, data, fin))
+
+    def send_text(self, data: bytes, fin: bool = True) -> None:
+        """
+        Send a `Text frame`_.
+
+        .. _Text frame:
+            https://datatracker.ietf.org/doc/html/rfc6455#section-5.6
+
+        Parameters:
+            data: payload containing text encoded with UTF-8.
+            fin: FIN bit; set it to :obj:`False` if this is the first frame of
+                a fragmented message.
+
+        Raises:
+            ProtocolError: if a fragmented message is in progress.
+
+        """
+        if self.expect_continuation_frame:
+            raise ProtocolError("expected a continuation frame")
+        self.expect_continuation_frame = not fin
+        self.send_frame(Frame(OP_TEXT, data, fin))
+
+    def send_binary(self, data: bytes, fin: bool = True) -> None:
+        """
+        Send a `Binary frame`_.
+
+        .. _Binary frame:
+            https://datatracker.ietf.org/doc/html/rfc6455#section-5.6
+
+        Parameters:
+            data: payload containing arbitrary binary data.
+            fin: FIN bit; set it to :obj:`False` if this is the first frame of
+                a fragmented message.
+
+        Raises:
+            ProtocolError: if a fragmented message is in progress.
+
+        """
+        if self.expect_continuation_frame:
+            raise ProtocolError("expected a continuation frame")
+        self.expect_continuation_frame = not fin
+        self.send_frame(Frame(OP_BINARY, data, fin))
+
+    def send_close(self, code: Optional[int] = None, reason: str = "") -> None:
+        """
+        Send a `Close frame`_.
+
+        .. _Close frame:
+            https://datatracker.ietf.org/doc/html/rfc6455#section-5.5.1
+
+        Parameters:
+            code: close code.
+            reason: close reason.
+
+        Raises:
+            ProtocolError: if a fragmented message is being sent, if the code
+                isn't valid, or if a reason is provided without a code
+
+        """
+        if self.expect_continuation_frame:
+            raise ProtocolError("expected a continuation frame")
+        if code is None:
+            if reason != "":
+                raise ProtocolError("cannot send a reason without a code")
+            close = Close(CloseCode.NO_STATUS_RCVD, "")
+            data = b""
+        else:
+            close = Close(code, reason)
+            data = close.serialize()
+        # send_frame() guarantees that self.state is OPEN at this point.
+        # 7.1.3. The WebSocket Closing Handshake is Started
+        self.send_frame(Frame(OP_CLOSE, data))
+        self.close_sent = close
+        self.state = CLOSING
+
+    def send_ping(self, data: bytes) -> None:
+        """
+        Send a `Ping frame`_.
+
+        .. _Ping frame:
+            https://datatracker.ietf.org/doc/html/rfc6455#section-5.5.2
+
+        Parameters:
+            data: payload containing arbitrary binary data.
+
+        """
+        self.send_frame(Frame(OP_PING, data))
+
+    def send_pong(self, data: bytes) -> None:
+        """
+        Send a `Pong frame`_.
+
+        .. _Pong frame:
+            https://datatracker.ietf.org/doc/html/rfc6455#section-5.5.3
+
+        Parameters:
+            data: payload containing arbitrary binary data.
+
+        """
+        self.send_frame(Frame(OP_PONG, data))
+
+    def fail(self, code: int, reason: str = "") -> None:
+        """
+        `Fail the WebSocket connection`_.
+
+        .. _Fail the WebSocket connection:
+            https://datatracker.ietf.org/doc/html/rfc6455#section-7.1.7
+
+        Parameters:
+            code: close code
+            reason: close reason
+
+        Raises:
+            ProtocolError: if the code isn't valid.
+        """
+        # 7.1.7. Fail the WebSocket Connection
+
+        # Send a close frame when the state is OPEN (a close frame was already
+        # sent if it's CLOSING), except when failing the connection because
+        # of an error reading from or writing to the network.
+        if self.state is OPEN:
+            if code != CloseCode.ABNORMAL_CLOSURE:
+                close = Close(code, reason)
+                data = close.serialize()
+                self.send_frame(Frame(OP_CLOSE, data))
+                self.close_sent = close
+                self.state = CLOSING
+
+        # When failing the connection, a server closes the TCP connection
+        # without waiting for the client to complete the handshake, while a
+        # client waits for the server to close the TCP connection, possibly
+        # after sending a close frame that the client will ignore.
+        if self.side is SERVER and not self.eof_sent:
+            self.send_eof()
+
+        # 7.1.7. Fail the WebSocket Connection "An endpoint MUST NOT continue
+        # to attempt to process data(including a responding Close frame) from
+        # the remote endpoint after being instructed to _Fail the WebSocket
+        # Connection_."
+        self.parser = self.discard()
+        next(self.parser)  # start coroutine
+
+    # Public method for getting incoming events after receiving data.
+
+    def events_received(self) -> List[Event]:
+        """
+        Fetch events generated from data received from the network.
+
+        Call this method immediately after any of the ``receive_*()`` methods.
+
+        Process resulting events, likely by passing them to the application.
+
+        Returns:
+            List[Event]: Events read from the connection.
+        """
+        events, self.events = self.events, []
+        return events
+
+    # Public method for getting outgoing data after receiving data or sending events.
+
+    def data_to_send(self) -> List[bytes]:
+        """
+        Obtain data to send to the network.
+
+        Call this method immediately after any of the ``receive_*()``,
+        ``send_*()``, or :meth:`fail` methods.
+
+        Write resulting data to the connection.
+
+        The empty bytestring :data:`~websockets.protocol.SEND_EOF` signals
+        the end of the data stream. When you receive it, half-close the TCP
+        connection.
+
+        Returns:
+            List[bytes]: Data to write to the connection.
+
+        """
+        writes, self.writes = self.writes, []
+        return writes
+
+    def close_expected(self) -> bool:
+        """
+        Tell if the TCP connection is expected to close soon.
+
+        Call this method immediately after any of the ``receive_*()``,
+        ``send_close()``, or :meth:`fail` methods.
+
+        If it returns :obj:`True`, schedule closing the TCP connection after a
+        short timeout if the other side hasn't already closed it.
+
+        Returns:
+            bool: Whether the TCP connection is expected to close soon.
+
+        """
+        # We expect a TCP close if and only if we sent a close frame:
+        # * Normal closure: once we send a close frame, we expect a TCP close:
+        #   server waits for client to complete the TCP closing handshake;
+        #   client waits for server to initiate the TCP closing handshake.
+        # * Abnormal closure: we always send a close frame and the same logic
+        #   applies, except on EOFError where we don't send a close frame
+        #   because we already received the TCP close, so we don't expect it.
+        # We already got a TCP Close if and only if the state is CLOSED.
+        return self.state is CLOSING or self.handshake_exc is not None
+
+    # Private methods for receiving data.
+
+    def parse(self) -> Generator[None, None, None]:
+        """
+        Parse incoming data into frames.
+
+        :meth:`receive_data` and :meth:`receive_eof` run this generator
+        coroutine until it needs more data or reaches EOF.
+
+        :meth:`parse` never raises an exception. Instead, it sets the
+        :attr:`parser_exc` and yields control.
+
+        """
+        try:
+            while True:
+                if (yield from self.reader.at_eof()):
+                    if self.debug:
+                        self.logger.debug("< EOF")
+                    # If the WebSocket connection is closed cleanly, with a
+                    # closing handhshake, recv_frame() substitutes parse()
+                    # with discard(). This branch is reached only when the
+                    # connection isn't closed cleanly.
+                    raise EOFError("unexpected end of stream")
+
+                if self.max_size is None:
+                    max_size = None
+                elif self.cur_size is None:
+                    max_size = self.max_size
+                else:
+                    max_size = self.max_size - self.cur_size
+
+                # During a normal closure, execution ends here on the next
+                # iteration of the loop after receiving a close frame. At
+                # this point, recv_frame() replaced parse() by discard().
+                frame = yield from Frame.parse(
+                    self.reader.read_exact,
+                    mask=self.side is SERVER,
+                    max_size=max_size,
+                    extensions=self.extensions,
+                )
+
+                if self.debug:
+                    self.logger.debug("< %s", frame)
+
+                self.recv_frame(frame)
+
+        except ProtocolError as exc:
+            self.fail(CloseCode.PROTOCOL_ERROR, str(exc))
+            self.parser_exc = exc
+
+        except EOFError as exc:
+            self.fail(CloseCode.ABNORMAL_CLOSURE, str(exc))
+            self.parser_exc = exc
+
+        except UnicodeDecodeError as exc:
+            self.fail(CloseCode.INVALID_DATA, f"{exc.reason} at position {exc.start}")
+            self.parser_exc = exc
+
+        except PayloadTooBig as exc:
+            self.fail(CloseCode.MESSAGE_TOO_BIG, str(exc))
+            self.parser_exc = exc
+
+        except Exception as exc:
+            self.logger.error("parser failed", exc_info=True)
+            # Don't include exception details, which may be security-sensitive.
+            self.fail(CloseCode.INTERNAL_ERROR)
+            self.parser_exc = exc
+
+        # During an abnormal closure, execution ends here after catching an
+        # exception. At this point, fail() replaced parse() by discard().
+        yield
+        raise AssertionError("parse() shouldn't step after error")
+
+    def discard(self) -> Generator[None, None, None]:
+        """
+        Discard incoming data.
+
+        This coroutine replaces :meth:`parse`:
+
+        - after receiving a close frame, during a normal closure (1.4);
+        - after sending a close frame, during an abnormal closure (7.1.7).
+
+        """
+        # The server close the TCP connection in the same circumstances where
+        # discard() replaces parse(). The client closes the connection later,
+        # after the server closes the connection or a timeout elapses.
+        # (The latter case cannot be handled in this Sans-I/O layer.)
+        assert (self.side is SERVER) == (self.eof_sent)
+        while not (yield from self.reader.at_eof()):
+            self.reader.discard()
+        if self.debug:
+            self.logger.debug("< EOF")
+        # A server closes the TCP connection immediately, while a client
+        # waits for the server to close the TCP connection.
+        if self.side is CLIENT:
+            self.send_eof()
+        self.state = CLOSED
+        # If discard() completes normally, execution ends here.
+        yield
+        # Once the reader reaches EOF, its feed_data/eof() methods raise an
+        # error, so our receive_data/eof() methods don't step the generator.
+        raise AssertionError("discard() shouldn't step after EOF")
+
+    def recv_frame(self, frame: Frame) -> None:
+        """
+        Process an incoming frame.
+
+        """
+        if frame.opcode is OP_TEXT or frame.opcode is OP_BINARY:
+            if self.cur_size is not None:
+                raise ProtocolError("expected a continuation frame")
+            if frame.fin:
+                self.cur_size = None
+            else:
+                self.cur_size = len(frame.data)
+
+        elif frame.opcode is OP_CONT:
+            if self.cur_size is None:
+                raise ProtocolError("unexpected continuation frame")
+            if frame.fin:
+                self.cur_size = None
+            else:
+                self.cur_size += len(frame.data)
+
+        elif frame.opcode is OP_PING:
+            # 5.5.2. Ping: "Upon receipt of a Ping frame, an endpoint MUST
+            # send a Pong frame in response"
+            pong_frame = Frame(OP_PONG, frame.data)
+            self.send_frame(pong_frame)
+
+        elif frame.opcode is OP_PONG:
+            # 5.5.3 Pong: "A response to an unsolicited Pong frame is not
+            # expected."
+            pass
+
+        elif frame.opcode is OP_CLOSE:
+            # 7.1.5.  The WebSocket Connection Close Code
+            # 7.1.6.  The WebSocket Connection Close Reason
+            self.close_rcvd = Close.parse(frame.data)
+            if self.state is CLOSING:
+                assert self.close_sent is not None
+                self.close_rcvd_then_sent = False
+
+            if self.cur_size is not None:
+                raise ProtocolError("incomplete fragmented message")
+
+            # 5.5.1 Close: "If an endpoint receives a Close frame and did
+            # not previously send a Close frame, the endpoint MUST send a
+            # Close frame in response. (When sending a Close frame in
+            # response, the endpoint typically echos the status code it
+            # received.)"
+
+            if self.state is OPEN:
+                # Echo the original data instead of re-serializing it with
+                # Close.serialize() because that fails when the close frame
+                # is empty and Close.parse() synthesizes a 1005 close code.
+                # The rest is identical to send_close().
+                self.send_frame(Frame(OP_CLOSE, frame.data))
+                self.close_sent = self.close_rcvd
+                self.close_rcvd_then_sent = True
+                self.state = CLOSING
+
+            # 7.1.2. Start the WebSocket Closing Handshake: "Once an
+            # endpoint has both sent and received a Close control frame,
+            # that endpoint SHOULD _Close the WebSocket Connection_"
+
+            # A server closes the TCP connection immediately, while a client
+            # waits for the server to close the TCP connection.
+            if self.side is SERVER:
+                self.send_eof()
+
+            # 1.4. Closing Handshake: "after receiving a control frame
+            # indicating the connection should be closed, a peer discards
+            # any further data received."
+            self.parser = self.discard()
+            next(self.parser)  # start coroutine
+
+        else:
+            # This can't happen because Frame.parse() validates opcodes.
+            raise AssertionError(f"unexpected opcode: {frame.opcode:02x}")
+
+        self.events.append(frame)
+
+    # Private methods for sending events.
+
+    def send_frame(self, frame: Frame) -> None:
+        if self.state is not OPEN:
+            raise InvalidState(
+                f"cannot write to a WebSocket in the {self.state.name} state"
+            )
+
+        if self.debug:
+            self.logger.debug("> %s", frame)
+        self.writes.append(
+            frame.serialize(mask=self.side is CLIENT, extensions=self.extensions)
+        )
+
+    def send_eof(self) -> None:
+        assert not self.eof_sent
+        self.eof_sent = True
+        if self.debug:
+            self.logger.debug("> EOF")
+        self.writes.append(SEND_EOF)

code/.venv/lib/python3.12/site-packages/websockets/server.py

@@ -0,0 +1,580 @@
+from __future__ import annotations
+
+import base64
+import binascii
+import email.utils
+import http
+import warnings
+from typing import Any, Callable, Generator, List, Optional, Sequence, Tuple, cast
+
+from .datastructures import Headers, MultipleValuesError
+from .exceptions import (
+    InvalidHandshake,
+    InvalidHeader,
+    InvalidHeaderValue,
+    InvalidOrigin,
+    InvalidStatus,
+    InvalidUpgrade,
+    NegotiationError,
+)
+from .extensions import Extension, ServerExtensionFactory
+from .headers import (
+    build_extension,
+    parse_connection,
+    parse_extension,
+    parse_subprotocol,
+    parse_upgrade,
+)
+from .http11 import Request, Response
+from .protocol import CONNECTING, OPEN, SERVER, Protocol, State
+from .typing import (
+    ConnectionOption,
+    ExtensionHeader,
+    LoggerLike,
+    Origin,
+    StatusLike,
+    Subprotocol,
+    UpgradeProtocol,
+)
+from .utils import accept_key
+
+
+# See #940 for why lazy_import isn't used here for backwards compatibility.
+# See #1400 for why listing compatibility imports in __all__ helps PyCharm.
+from .legacy.server import *  # isort:skip  # noqa: I001
+from .legacy.server import __all__ as legacy__all__
+
+
+__all__ = ["ServerProtocol"] + legacy__all__
+
+
+class ServerProtocol(Protocol):
+    """
+    Sans-I/O implementation of a WebSocket server connection.
+
+    Args:
+        origins: acceptable values of the ``Origin`` header; include
+            :obj:`None` in the list if the lack of an origin is acceptable.
+            This is useful for defending against Cross-Site WebSocket
+            Hijacking attacks.
+        extensions: list of supported extensions, in order in which they
+            should be tried.
+        subprotocols: list of supported subprotocols, in order of decreasing
+            preference.
+        select_subprotocol: Callback for selecting a subprotocol among
+            those supported by the client and the server. It has the same
+            signature as the :meth:`select_subprotocol` method, including a
+            :class:`ServerProtocol` instance as first argument.
+        state: initial state of the WebSocket connection.
+        max_size: maximum size of incoming messages in bytes;
+            :obj:`None` disables the limit.
+        logger: logger for this connection;
+            defaults to ``logging.getLogger("websockets.client")``;
+            see the :doc:`logging guide <../../topics/logging>` for details.
+
+    """
+
+    def __init__(
+        self,
+        *,
+        origins: Optional[Sequence[Optional[Origin]]] = None,
+        extensions: Optional[Sequence[ServerExtensionFactory]] = None,
+        subprotocols: Optional[Sequence[Subprotocol]] = None,
+        select_subprotocol: Optional[
+            Callable[
+                [ServerProtocol, Sequence[Subprotocol]],
+                Optional[Subprotocol],
+            ]
+        ] = None,
+        state: State = CONNECTING,
+        max_size: Optional[int] = 2**20,
+        logger: Optional[LoggerLike] = None,
+    ):
+        super().__init__(
+            side=SERVER,
+            state=state,
+            max_size=max_size,
+            logger=logger,
+        )
+        self.origins = origins
+        self.available_extensions = extensions
+        self.available_subprotocols = subprotocols
+        if select_subprotocol is not None:
+            # Bind select_subprotocol then shadow self.select_subprotocol.
+            # Use setattr to work around https://github.com/python/mypy/issues/2427.
+            setattr(
+                self,
+                "select_subprotocol",
+                select_subprotocol.__get__(self, self.__class__),
+            )
+
+    def accept(self, request: Request) -> Response:
+        """
+        Create a handshake response to accept the connection.
+
+        If the connection cannot be established, the handshake response
+        actually rejects the handshake.
+
+        You must send the handshake response with :meth:`send_response`.
+
+        You may modify it before sending it, for example to add HTTP headers.
+
+        Args:
+            request: WebSocket handshake request event received from the client.
+
+        Returns:
+            WebSocket handshake response event to send to the client.
+
+        """
+        try:
+            (
+                accept_header,
+                extensions_header,
+                protocol_header,
+            ) = self.process_request(request)
+        except InvalidOrigin as exc:
+            request._exception = exc
+            self.handshake_exc = exc
+            if self.debug:
+                self.logger.debug("! invalid origin", exc_info=True)
+            return self.reject(
+                http.HTTPStatus.FORBIDDEN,
+                f"Failed to open a WebSocket connection: {exc}.\n",
+            )
+        except InvalidUpgrade as exc:
+            request._exception = exc
+            self.handshake_exc = exc
+            if self.debug:
+                self.logger.debug("! invalid upgrade", exc_info=True)
+            response = self.reject(
+                http.HTTPStatus.UPGRADE_REQUIRED,
+                (
+                    f"Failed to open a WebSocket connection: {exc}.\n"
+                    f"\n"
+                    f"You cannot access a WebSocket server directly "
+                    f"with a browser. You need a WebSocket client.\n"
+                ),
+            )
+            response.headers["Upgrade"] = "websocket"
+            return response
+        except InvalidHandshake as exc:
+            request._exception = exc
+            self.handshake_exc = exc
+            if self.debug:
+                self.logger.debug("! invalid handshake", exc_info=True)
+            return self.reject(
+                http.HTTPStatus.BAD_REQUEST,
+                f"Failed to open a WebSocket connection: {exc}.\n",
+            )
+        except Exception as exc:
+            # Handle exceptions raised by user-provided select_subprotocol and
+            # unexpected errors.
+            request._exception = exc
+            self.handshake_exc = exc
+            self.logger.error("opening handshake failed", exc_info=True)
+            return self.reject(
+                http.HTTPStatus.INTERNAL_SERVER_ERROR,
+                (
+                    "Failed to open a WebSocket connection.\n"
+                    "See server log for more information.\n"
+                ),
+            )
+
+        headers = Headers()
+
+        headers["Date"] = email.utils.formatdate(usegmt=True)
+
+        headers["Upgrade"] = "websocket"
+        headers["Connection"] = "Upgrade"
+        headers["Sec-WebSocket-Accept"] = accept_header
+
+        if extensions_header is not None:
+            headers["Sec-WebSocket-Extensions"] = extensions_header
+
+        if protocol_header is not None:
+            headers["Sec-WebSocket-Protocol"] = protocol_header
+
+        self.logger.info("connection open")
+        return Response(101, "Switching Protocols", headers)
+
+    def process_request(
+        self,
+        request: Request,
+    ) -> Tuple[str, Optional[str], Optional[str]]:
+        """
+        Check a handshake request and negotiate extensions and subprotocol.
+
+        This function doesn't verify that the request is an HTTP/1.1 or higher
+        GET request and doesn't check the ``Host`` header. These controls are
+        usually performed earlier in the HTTP request handling code. They're
+        the responsibility of the caller.
+
+        Args:
+            request: WebSocket handshake request received from the client.
+
+        Returns:
+            Tuple[str, Optional[str], Optional[str]]:
+            ``Sec-WebSocket-Accept``, ``Sec-WebSocket-Extensions``, and
+            ``Sec-WebSocket-Protocol`` headers for the handshake response.
+
+        Raises:
+            InvalidHandshake: if the handshake request is invalid;
+                then the server must return 400 Bad Request error.
+
+        """
+        headers = request.headers
+
+        connection: List[ConnectionOption] = sum(
+            [parse_connection(value) for value in headers.get_all("Connection")], []
+        )
+
+        if not any(value.lower() == "upgrade" for value in connection):
+            raise InvalidUpgrade(
+                "Connection", ", ".join(connection) if connection else None
+            )
+
+        upgrade: List[UpgradeProtocol] = sum(
+            [parse_upgrade(value) for value in headers.get_all("Upgrade")], []
+        )
+
+        # For compatibility with non-strict implementations, ignore case when
+        # checking the Upgrade header. The RFC always uses "websocket", except
+        # in section 11.2. (IANA registration) where it uses "WebSocket".
+        if not (len(upgrade) == 1 and upgrade[0].lower() == "websocket"):
+            raise InvalidUpgrade("Upgrade", ", ".join(upgrade) if upgrade else None)
+
+        try:
+            key = headers["Sec-WebSocket-Key"]
+        except KeyError as exc:
+            raise InvalidHeader("Sec-WebSocket-Key") from exc
+        except MultipleValuesError as exc:
+            raise InvalidHeader(
+                "Sec-WebSocket-Key", "more than one Sec-WebSocket-Key header found"
+            ) from exc
+
+        try:
+            raw_key = base64.b64decode(key.encode(), validate=True)
+        except binascii.Error as exc:
+            raise InvalidHeaderValue("Sec-WebSocket-Key", key) from exc
+        if len(raw_key) != 16:
+            raise InvalidHeaderValue("Sec-WebSocket-Key", key)
+
+        try:
+            version = headers["Sec-WebSocket-Version"]
+        except KeyError as exc:
+            raise InvalidHeader("Sec-WebSocket-Version") from exc
+        except MultipleValuesError as exc:
+            raise InvalidHeader(
+                "Sec-WebSocket-Version",
+                "more than one Sec-WebSocket-Version header found",
+            ) from exc
+
+        if version != "13":
+            raise InvalidHeaderValue("Sec-WebSocket-Version", version)
+
+        accept_header = accept_key(key)
+
+        self.origin = self.process_origin(headers)
+
+        extensions_header, self.extensions = self.process_extensions(headers)
+
+        protocol_header = self.subprotocol = self.process_subprotocol(headers)
+
+        return (
+            accept_header,
+            extensions_header,
+            protocol_header,
+        )
+
+    def process_origin(self, headers: Headers) -> Optional[Origin]:
+        """
+        Handle the Origin HTTP request header.
+
+        Args:
+            headers: WebSocket handshake request headers.
+
+        Returns:
+           Optional[Origin]: origin, if it is acceptable.
+
+        Raises:
+            InvalidHandshake: if the Origin header is invalid.
+            InvalidOrigin: if the origin isn't acceptable.
+
+        """
+        # "The user agent MUST NOT include more than one Origin header field"
+        # per https://www.rfc-editor.org/rfc/rfc6454.html#section-7.3.
+        try:
+            origin = cast(Optional[Origin], headers.get("Origin"))
+        except MultipleValuesError as exc:
+            raise InvalidHeader("Origin", "more than one Origin header found") from exc
+        if self.origins is not None:
+            if origin not in self.origins:
+                raise InvalidOrigin(origin)
+        return origin
+
+    def process_extensions(
+        self,
+        headers: Headers,
+    ) -> Tuple[Optional[str], List[Extension]]:
+        """
+        Handle the Sec-WebSocket-Extensions HTTP request header.
+
+        Accept or reject each extension proposed in the client request.
+        Negotiate parameters for accepted extensions.
+
+        Per :rfc:`6455`, negotiation rules are defined by the specification of
+        each extension.
+
+        To provide this level of flexibility, for each extension proposed by
+        the client, we check for a match with each extension available in the
+        server configuration. If no match is found, the extension is ignored.
+
+        If several variants of the same extension are proposed by the client,
+        it may be accepted several times, which won't make sense in general.
+        Extensions must implement their own requirements. For this purpose,
+        the list of previously accepted extensions is provided.
+
+        This process doesn't allow the server to reorder extensions. It can
+        only select a subset of the extensions proposed by the client.
+
+        Other requirements, for example related to mandatory extensions or the
+        order of extensions, may be implemented by overriding this method.
+
+        Args:
+            headers: WebSocket handshake request headers.
+
+        Returns:
+            Tuple[Optional[str], List[Extension]]: ``Sec-WebSocket-Extensions``
+            HTTP response header and list of accepted extensions.
+
+        Raises:
+            InvalidHandshake: if the Sec-WebSocket-Extensions header is invalid.
+
+        """
+        response_header_value: Optional[str] = None
+
+        extension_headers: List[ExtensionHeader] = []
+        accepted_extensions: List[Extension] = []
+
+        header_values = headers.get_all("Sec-WebSocket-Extensions")
+
+        if header_values and self.available_extensions:
+            parsed_header_values: List[ExtensionHeader] = sum(
+                [parse_extension(header_value) for header_value in header_values], []
+            )
+
+            for name, request_params in parsed_header_values:
+                for ext_factory in self.available_extensions:
+                    # Skip non-matching extensions based on their name.
+                    if ext_factory.name != name:
+                        continue
+
+                    # Skip non-matching extensions based on their params.
+                    try:
+                        response_params, extension = ext_factory.process_request_params(
+                            request_params, accepted_extensions
+                        )
+                    except NegotiationError:
+                        continue
+
+                    # Add matching extension to the final list.
+                    extension_headers.append((name, response_params))
+                    accepted_extensions.append(extension)
+
+                    # Break out of the loop once we have a match.
+                    break
+
+                # If we didn't break from the loop, no extension in our list
+                # matched what the client sent. The extension is declined.
+
+        # Serialize extension header.
+        if extension_headers:
+            response_header_value = build_extension(extension_headers)
+
+        return response_header_value, accepted_extensions
+
+    def process_subprotocol(self, headers: Headers) -> Optional[Subprotocol]:
+        """
+        Handle the Sec-WebSocket-Protocol HTTP request header.
+
+        Args:
+            headers: WebSocket handshake request headers.
+
+        Returns:
+           Optional[Subprotocol]: Subprotocol, if one was selected; this is
+           also the value of the ``Sec-WebSocket-Protocol`` response header.
+
+        Raises:
+            InvalidHandshake: if the Sec-WebSocket-Subprotocol header is invalid.
+
+        """
+        subprotocols: Sequence[Subprotocol] = sum(
+            [
+                parse_subprotocol(header_value)
+                for header_value in headers.get_all("Sec-WebSocket-Protocol")
+            ],
+            [],
+        )
+
+        return self.select_subprotocol(subprotocols)
+
+    def select_subprotocol(
+        self,
+        subprotocols: Sequence[Subprotocol],
+    ) -> Optional[Subprotocol]:
+        """
+        Pick a subprotocol among those offered by the client.
+
+        If several subprotocols are supported by both the client and the server,
+        pick the first one in the list declared the server.
+
+        If the server doesn't support any subprotocols, continue without a
+        subprotocol, regardless of what the client offers.
+
+        If the server supports at least one subprotocol and the client doesn't
+        offer any, abort the handshake with an HTTP 400 error.
+
+        You provide a ``select_subprotocol`` argument to :class:`ServerProtocol`
+        to override this logic. For example, you could accept the connection
+        even if client doesn't offer a subprotocol, rather than reject it.
+
+        Here's how to negotiate the ``chat`` subprotocol if the client supports
+        it and continue without a subprotocol otherwise::
+
+            def select_subprotocol(protocol, subprotocols):
+                if "chat" in subprotocols:
+                    return "chat"
+
+        Args:
+            subprotocols: list of subprotocols offered by the client.
+
+        Returns:
+            Optional[Subprotocol]: Selected subprotocol, if a common subprotocol
+            was found.
+
+            :obj:`None` to continue without a subprotocol.
+
+        Raises:
+            NegotiationError: custom implementations may raise this exception
+                to abort the handshake with an HTTP 400 error.
+
+        """
+        # Server doesn't offer any subprotocols.
+        if not self.available_subprotocols:  # None or empty list
+            return None
+
+        # Server offers at least one subprotocol but client doesn't offer any.
+        if not subprotocols:
+            raise NegotiationError("missing subprotocol")
+
+        # Server and client both offer subprotocols. Look for a shared one.
+        proposed_subprotocols = set(subprotocols)
+        for subprotocol in self.available_subprotocols:
+            if subprotocol in proposed_subprotocols:
+                return subprotocol
+
+        # No common subprotocol was found.
+        raise NegotiationError(
+            "invalid subprotocol; expected one of "
+            + ", ".join(self.available_subprotocols)
+        )
+
+    def reject(
+        self,
+        status: StatusLike,
+        text: str,
+    ) -> Response:
+        """
+        Create a handshake response to reject the connection.
+
+        A short plain text response is the best fallback when failing to
+        establish a WebSocket connection.
+
+        You must send the handshake response with :meth:`send_response`.
+
+        You can modify it before sending it, for example to alter HTTP headers.
+
+        Args:
+            status: HTTP status code.
+            text: HTTP response body; will be encoded to UTF-8.
+
+        Returns:
+            Response: WebSocket handshake response event to send to the client.
+
+        """
+        # If a user passes an int instead of a HTTPStatus, fix it automatically.
+        status = http.HTTPStatus(status)
+        body = text.encode()
+        headers = Headers(
+            [
+                ("Date", email.utils.formatdate(usegmt=True)),
+                ("Connection", "close"),
+                ("Content-Length", str(len(body))),
+                ("Content-Type", "text/plain; charset=utf-8"),
+            ]
+        )
+        response = Response(status.value, status.phrase, headers, body)
+        # When reject() is called from accept(), handshake_exc is already set.
+        # If a user calls reject(), set handshake_exc to guarantee invariant:
+        # "handshake_exc is None if and only if opening handshake succeeded."
+        if self.handshake_exc is None:
+            self.handshake_exc = InvalidStatus(response)
+        self.logger.info("connection rejected (%d %s)", status.value, status.phrase)
+        return response
+
+    def send_response(self, response: Response) -> None:
+        """
+        Send a handshake response to the client.
+
+        Args:
+            response: WebSocket handshake response event to send.
+
+        """
+        if self.debug:
+            code, phrase = response.status_code, response.reason_phrase
+            self.logger.debug("> HTTP/1.1 %d %s", code, phrase)
+            for key, value in response.headers.raw_items():
+                self.logger.debug("> %s: %s", key, value)
+            if response.body is not None:
+                self.logger.debug("> [body] (%d bytes)", len(response.body))
+
+        self.writes.append(response.serialize())
+
+        if response.status_code == 101:
+            assert self.state is CONNECTING
+            self.state = OPEN
+        else:
+            self.send_eof()
+            self.parser = self.discard()
+            next(self.parser)  # start coroutine
+
+    def parse(self) -> Generator[None, None, None]:
+        if self.state is CONNECTING:
+            try:
+                request = yield from Request.parse(
+                    self.reader.read_line,
+                )
+            except Exception as exc:
+                self.handshake_exc = exc
+                self.send_eof()
+                self.parser = self.discard()
+                next(self.parser)  # start coroutine
+                yield
+
+            if self.debug:
+                self.logger.debug("< GET %s HTTP/1.1", request.path)
+                for key, value in request.headers.raw_items():
+                    self.logger.debug("< %s: %s", key, value)
+
+            self.events.append(request)
+
+        yield from super().parse()
+
+
+class ServerConnection(ServerProtocol):
+    def __init__(self, *args: Any, **kwargs: Any) -> None:
+        warnings.warn(
+            "ServerConnection was renamed to ServerProtocol",
+            DeprecationWarning,
+        )
+        super().__init__(*args, **kwargs)

code/.venv/lib/python3.12/site-packages/websockets/speedups.c

@@ -0,0 +1,223 @@
+/* C implementation of performance sensitive functions. */
+
+#define PY_SSIZE_T_CLEAN
+#include <Python.h>
+#include <stdint.h> /* uint8_t, uint32_t, uint64_t */
+
+#if __ARM_NEON
+#include <arm_neon.h>
+#elif __SSE2__
+#include <emmintrin.h>
+#endif
+
+static const Py_ssize_t MASK_LEN = 4;
+
+/* Similar to PyBytes_AsStringAndSize, but accepts more types */
+
+static int
+_PyBytesLike_AsStringAndSize(PyObject *obj, PyObject **tmp, char **buffer, Py_ssize_t *length)
+{
+    // This supports bytes, bytearrays, and memoryview objects,
+    // which are common data structures for handling byte streams.
+    // websockets.framing.prepare_data() returns only these types.
+    // If *tmp isn't NULL, the caller gets a new reference.
+    if (PyBytes_Check(obj))
+    {
+        *tmp = NULL;
+        *buffer = PyBytes_AS_STRING(obj);
+        *length = PyBytes_GET_SIZE(obj);
+    }
+    else if (PyByteArray_Check(obj))
+    {
+        *tmp = NULL;
+        *buffer = PyByteArray_AS_STRING(obj);
+        *length = PyByteArray_GET_SIZE(obj);
+    }
+    else if (PyMemoryView_Check(obj))
+    {
+        *tmp = PyMemoryView_GetContiguous(obj, PyBUF_READ, 'C');
+        if (*tmp == NULL)
+        {
+            return -1;
+        }
+        Py_buffer *mv_buf;
+        mv_buf = PyMemoryView_GET_BUFFER(*tmp);
+        *buffer = mv_buf->buf;
+        *length = mv_buf->len;
+    }
+    else
+    {
+        PyErr_Format(
+            PyExc_TypeError,
+            "expected a bytes-like object, %.200s found",
+            Py_TYPE(obj)->tp_name);
+        return -1;
+    }
+
+    return 0;
+}
+
+/* C implementation of websockets.utils.apply_mask */
+
+static PyObject *
+apply_mask(PyObject *self, PyObject *args, PyObject *kwds)
+{
+
+    // In order to support various bytes-like types, accept any Python object.
+
+    static char *kwlist[] = {"data", "mask", NULL};
+    PyObject *input_obj;
+    PyObject *mask_obj;
+
+    // A pointer to a char * + length will be extracted from the data and mask
+    // arguments, possibly via a Py_buffer.
+
+    PyObject *input_tmp = NULL;
+    char *input;
+    Py_ssize_t input_len;
+    PyObject *mask_tmp = NULL;
+    char *mask;
+    Py_ssize_t mask_len;
+
+    // Initialize a PyBytesObject then get a pointer to the underlying char *
+    // in order to avoid an extra memory copy in PyBytes_FromStringAndSize.
+
+    PyObject *result = NULL;
+    char *output;
+
+    // Other variables.
+
+    Py_ssize_t i = 0;
+
+    // Parse inputs.
+
+    if (!PyArg_ParseTupleAndKeywords(
+            args, kwds, "OO", kwlist, &input_obj, &mask_obj))
+    {
+        goto exit;
+    }
+
+    if (_PyBytesLike_AsStringAndSize(input_obj, &input_tmp, &input, &input_len) == -1)
+    {
+        goto exit;
+    }
+
+    if (_PyBytesLike_AsStringAndSize(mask_obj, &mask_tmp, &mask, &mask_len) == -1)
+    {
+        goto exit;
+    }
+
+    if (mask_len != MASK_LEN)
+    {
+        PyErr_SetString(PyExc_ValueError, "mask must contain 4 bytes");
+        goto exit;
+    }
+
+    // Create output.
+
+    result = PyBytes_FromStringAndSize(NULL, input_len);
+    if (result == NULL)
+    {
+        goto exit;
+    }
+
+    // Since we just created result, we don't need error checks.
+    output = PyBytes_AS_STRING(result);
+
+    // Perform the masking operation.
+
+    // Apparently GCC cannot figure out the following optimizations by itself.
+
+    // We need a new scope for MSVC 2010 (non C99 friendly)
+    {
+#if __ARM_NEON
+
+        // With NEON support, XOR by blocks of 16 bytes = 128 bits.
+
+        Py_ssize_t input_len_128 = input_len & ~15;
+        uint8x16_t mask_128 = vreinterpretq_u8_u32(vdupq_n_u32(*(uint32_t *)mask));
+
+        for (; i < input_len_128; i += 16)
+        {
+            uint8x16_t in_128 = vld1q_u8((uint8_t *)(input + i));
+            uint8x16_t out_128 = veorq_u8(in_128, mask_128);
+            vst1q_u8((uint8_t *)(output + i), out_128);
+        }
+
+#elif __SSE2__
+
+        // With SSE2 support, XOR by blocks of 16 bytes = 128 bits.
+
+        // Since we cannot control the 16-bytes alignment of input and output
+        // buffers, we rely on loadu/storeu rather than load/store.
+
+        Py_ssize_t input_len_128 = input_len & ~15;
+        __m128i mask_128 = _mm_set1_epi32(*(uint32_t *)mask);
+
+        for (; i < input_len_128; i += 16)
+        {
+            __m128i in_128 = _mm_loadu_si128((__m128i *)(input + i));
+            __m128i out_128 = _mm_xor_si128(in_128, mask_128);
+            _mm_storeu_si128((__m128i *)(output + i), out_128);
+        }
+
+#else
+
+        // Without SSE2 support, XOR by blocks of 8 bytes = 64 bits.
+
+        // We assume the memory allocator aligns everything on 8 bytes boundaries.
+
+        Py_ssize_t input_len_64 = input_len & ~7;
+        uint32_t mask_32 = *(uint32_t *)mask;
+        uint64_t mask_64 = ((uint64_t)mask_32 << 32) | (uint64_t)mask_32;
+
+        for (; i < input_len_64; i += 8)
+        {
+            *(uint64_t *)(output + i) = *(uint64_t *)(input + i) ^ mask_64;
+        }
+
+#endif
+    }
+
+    // XOR the remainder of the input byte by byte.
+
+    for (; i < input_len; i++)
+    {
+        output[i] = input[i] ^ mask[i & (MASK_LEN - 1)];
+    }
+
+exit:
+    Py_XDECREF(input_tmp);
+    Py_XDECREF(mask_tmp);
+    return result;
+
+}
+
+static PyMethodDef speedups_methods[] = {
+    {
+        "apply_mask",
+        (PyCFunction)apply_mask,
+        METH_VARARGS | METH_KEYWORDS,
+        "Apply masking to the data of a WebSocket message.",
+    },
+    {NULL, NULL, 0, NULL},      /* Sentinel */
+};
+
+static struct PyModuleDef speedups_module = {
+    PyModuleDef_HEAD_INIT,
+    "websocket.speedups",       /* m_name */
+    "C implementation of performance sensitive functions.",
+                                /* m_doc */
+    -1,                         /* m_size */
+    speedups_methods,           /* m_methods */
+    NULL,
+    NULL,
+    NULL,
+    NULL
+};
+
+PyMODINIT_FUNC
+PyInit_speedups(void)
+{
+    return PyModule_Create(&speedups_module);
+}

code/.venv/lib/python3.12/site-packages/websockets/streams.py

@@ -0,0 +1,151 @@
+from __future__ import annotations
+
+from typing import Generator
+
+
+class StreamReader:
+    """
+    Generator-based stream reader.
+
+    This class doesn't support concurrent calls to :meth:`read_line`,
+    :meth:`read_exact`, or :meth:`read_to_eof`. Make sure calls are
+    serialized.
+
+    """
+
+    def __init__(self) -> None:
+        self.buffer = bytearray()
+        self.eof = False
+
+    def read_line(self, m: int) -> Generator[None, None, bytes]:
+        """
+        Read a LF-terminated line from the stream.
+
+        This is a generator-based coroutine.
+
+        The return value includes the LF character.
+
+        Args:
+            m: maximum number bytes to read; this is a security limit.
+
+        Raises:
+            EOFError: if the stream ends without a LF.
+            RuntimeError: if the stream ends in more than ``m`` bytes.
+
+        """
+        n = 0  # number of bytes to read
+        p = 0  # number of bytes without a newline
+        while True:
+            n = self.buffer.find(b"\n", p) + 1
+            if n > 0:
+                break
+            p = len(self.buffer)
+            if p > m:
+                raise RuntimeError(f"read {p} bytes, expected no more than {m} bytes")
+            if self.eof:
+                raise EOFError(f"stream ends after {p} bytes, before end of line")
+            yield
+        if n > m:
+            raise RuntimeError(f"read {n} bytes, expected no more than {m} bytes")
+        r = self.buffer[:n]
+        del self.buffer[:n]
+        return r
+
+    def read_exact(self, n: int) -> Generator[None, None, bytes]:
+        """
+        Read a given number of bytes from the stream.
+
+        This is a generator-based coroutine.
+
+        Args:
+            n: how many bytes to read.
+
+        Raises:
+            EOFError: if the stream ends in less than ``n`` bytes.
+
+        """
+        assert n >= 0
+        while len(self.buffer) < n:
+            if self.eof:
+                p = len(self.buffer)
+                raise EOFError(f"stream ends after {p} bytes, expected {n} bytes")
+            yield
+        r = self.buffer[:n]
+        del self.buffer[:n]
+        return r
+
+    def read_to_eof(self, m: int) -> Generator[None, None, bytes]:
+        """
+        Read all bytes from the stream.
+
+        This is a generator-based coroutine.
+
+        Args:
+            m: maximum number bytes to read; this is a security limit.
+
+        Raises:
+            RuntimeError: if the stream ends in more than ``m`` bytes.
+
+        """
+        while not self.eof:
+            p = len(self.buffer)
+            if p > m:
+                raise RuntimeError(f"read {p} bytes, expected no more than {m} bytes")
+            yield
+        r = self.buffer[:]
+        del self.buffer[:]
+        return r
+
+    def at_eof(self) -> Generator[None, None, bool]:
+        """
+        Tell whether the stream has ended and all data was read.
+
+        This is a generator-based coroutine.
+
+        """
+        while True:
+            if self.buffer:
+                return False
+            if self.eof:
+                return True
+            # When all data was read but the stream hasn't ended, we can't
+            # tell if until either feed_data() or feed_eof() is called.
+            yield
+
+    def feed_data(self, data: bytes) -> None:
+        """
+        Write data to the stream.
+
+        :meth:`feed_data` cannot be called after :meth:`feed_eof`.
+
+        Args:
+            data: data to write.
+
+        Raises:
+            EOFError: if the stream has ended.
+
+        """
+        if self.eof:
+            raise EOFError("stream ended")
+        self.buffer += data
+
+    def feed_eof(self) -> None:
+        """
+        End the stream.
+
+        :meth:`feed_eof` cannot be called more than once.
+
+        Raises:
+            EOFError: if the stream has ended.
+
+        """
+        if self.eof:
+            raise EOFError("stream ended")
+        self.eof = True
+
+    def discard(self) -> None:
+        """
+        Discard all buffered data, but don't end the stream.
+
+        """
+        del self.buffer[:]

code/.venv/lib/python3.12/site-packages/websockets/sync/client.py

@@ -0,0 +1,328 @@
+from __future__ import annotations
+
+import socket
+import ssl
+import threading
+from typing import Any, Optional, Sequence, Type
+
+from ..client import ClientProtocol
+from ..datastructures import HeadersLike
+from ..extensions.base import ClientExtensionFactory
+from ..extensions.permessage_deflate import enable_client_permessage_deflate
+from ..headers import validate_subprotocols
+from ..http import USER_AGENT
+from ..http11 import Response
+from ..protocol import CONNECTING, OPEN, Event
+from ..typing import LoggerLike, Origin, Subprotocol
+from ..uri import parse_uri
+from .connection import Connection
+from .utils import Deadline
+
+
+__all__ = ["connect", "unix_connect", "ClientConnection"]
+
+
+class ClientConnection(Connection):
+    """
+    Threaded implementation of a WebSocket client connection.
+
+    :class:`ClientConnection` provides :meth:`recv` and :meth:`send` methods for
+    receiving and sending messages.
+
+    It supports iteration to receive messages::
+
+        for message in websocket:
+            process(message)
+
+    The iterator exits normally when the connection is closed with close code
+    1000 (OK) or 1001 (going away) or without a close code. It raises a
+    :exc:`~websockets.exceptions.ConnectionClosedError` when the connection is
+    closed with any other code.
+
+    Args:
+        socket: Socket connected to a WebSocket server.
+        protocol: Sans-I/O connection.
+        close_timeout: Timeout for closing the connection in seconds.
+
+    """
+
+    def __init__(
+        self,
+        socket: socket.socket,
+        protocol: ClientProtocol,
+        *,
+        close_timeout: Optional[float] = 10,
+    ) -> None:
+        self.protocol: ClientProtocol
+        self.response_rcvd = threading.Event()
+        super().__init__(
+            socket,
+            protocol,
+            close_timeout=close_timeout,
+        )
+
+    def handshake(
+        self,
+        additional_headers: Optional[HeadersLike] = None,
+        user_agent_header: Optional[str] = USER_AGENT,
+        timeout: Optional[float] = None,
+    ) -> None:
+        """
+        Perform the opening handshake.
+
+        """
+        with self.send_context(expected_state=CONNECTING):
+            self.request = self.protocol.connect()
+            if additional_headers is not None:
+                self.request.headers.update(additional_headers)
+            if user_agent_header is not None:
+                self.request.headers["User-Agent"] = user_agent_header
+            self.protocol.send_request(self.request)
+
+        if not self.response_rcvd.wait(timeout):
+            self.close_socket()
+            self.recv_events_thread.join()
+            raise TimeoutError("timed out during handshake")
+
+        if self.response is None:
+            self.close_socket()
+            self.recv_events_thread.join()
+            raise ConnectionError("connection closed during handshake")
+
+        if self.protocol.state is not OPEN:
+            self.recv_events_thread.join(self.close_timeout)
+            self.close_socket()
+            self.recv_events_thread.join()
+
+        if self.protocol.handshake_exc is not None:
+            raise self.protocol.handshake_exc
+
+    def process_event(self, event: Event) -> None:
+        """
+        Process one incoming event.
+
+        """
+        # First event - handshake response.
+        if self.response is None:
+            assert isinstance(event, Response)
+            self.response = event
+            self.response_rcvd.set()
+        # Later events - frames.
+        else:
+            super().process_event(event)
+
+    def recv_events(self) -> None:
+        """
+        Read incoming data from the socket and process events.
+
+        """
+        try:
+            super().recv_events()
+        finally:
+            # If the connection is closed during the handshake, unblock it.
+            self.response_rcvd.set()
+
+
+def connect(
+    uri: str,
+    *,
+    # TCP/TLS — unix and path are only for unix_connect()
+    sock: Optional[socket.socket] = None,
+    ssl_context: Optional[ssl.SSLContext] = None,
+    server_hostname: Optional[str] = None,
+    unix: bool = False,
+    path: Optional[str] = None,
+    # WebSocket
+    origin: Optional[Origin] = None,
+    extensions: Optional[Sequence[ClientExtensionFactory]] = None,
+    subprotocols: Optional[Sequence[Subprotocol]] = None,
+    additional_headers: Optional[HeadersLike] = None,
+    user_agent_header: Optional[str] = USER_AGENT,
+    compression: Optional[str] = "deflate",
+    # Timeouts
+    open_timeout: Optional[float] = 10,
+    close_timeout: Optional[float] = 10,
+    # Limits
+    max_size: Optional[int] = 2**20,
+    # Logging
+    logger: Optional[LoggerLike] = None,
+    # Escape hatch for advanced customization
+    create_connection: Optional[Type[ClientConnection]] = None,
+) -> ClientConnection:
+    """
+    Connect to the WebSocket server at ``uri``.
+
+    This function returns a :class:`ClientConnection` instance, which you can
+    use to send and receive messages.
+
+    :func:`connect` may be used as a context manager::
+
+        async with websockets.sync.client.connect(...) as websocket:
+            ...
+
+    The connection is closed automatically when exiting the context.
+
+    Args:
+        uri: URI of the WebSocket server.
+        sock: Preexisting TCP socket. ``sock`` overrides the host and port
+            from ``uri``. You may call :func:`socket.create_connection` to
+            create a suitable TCP socket.
+        ssl_context: Configuration for enabling TLS on the connection.
+        server_hostname: Host name for the TLS handshake. ``server_hostname``
+            overrides the host name from ``uri``.
+        origin: Value of the ``Origin`` header, for servers that require it.
+        extensions: List of supported extensions, in order in which they
+            should be negotiated and run.
+        subprotocols: List of supported subprotocols, in order of decreasing
+            preference.
+        additional_headers (HeadersLike | None): Arbitrary HTTP headers to add
+            to the handshake request.
+        user_agent_header: Value of  the ``User-Agent`` request header.
+            It defaults to ``"Python/x.y.z websockets/X.Y"``.
+            Setting it to :obj:`None` removes the header.
+        compression: The "permessage-deflate" extension is enabled by default.
+            Set ``compression`` to :obj:`None` to disable it. See the
+            :doc:`compression guide <../../topics/compression>` for details.
+        open_timeout: Timeout for opening the connection in seconds.
+            :obj:`None` disables the timeout.
+        close_timeout: Timeout for closing the connection in seconds.
+            :obj:`None` disables the timeout.
+        max_size: Maximum size of incoming messages in bytes.
+            :obj:`None` disables the limit.
+        logger: Logger for this client.
+            It defaults to ``logging.getLogger("websockets.client")``.
+            See the :doc:`logging guide <../../topics/logging>` for details.
+        create_connection: Factory for the :class:`ClientConnection` managing
+            the connection. Set it to a wrapper or a subclass to customize
+            connection handling.
+
+    Raises:
+        InvalidURI: If ``uri`` isn't a valid WebSocket URI.
+        OSError: If the TCP connection fails.
+        InvalidHandshake: If the opening handshake fails.
+        TimeoutError: If the opening handshake times out.
+
+    """
+
+    # Process parameters
+
+    wsuri = parse_uri(uri)
+    if not wsuri.secure and ssl_context is not None:
+        raise TypeError("ssl_context argument is incompatible with a ws:// URI")
+
+    if unix:
+        if path is None and sock is None:
+            raise TypeError("missing path argument")
+        elif path is not None and sock is not None:
+            raise TypeError("path and sock arguments are incompatible")
+    else:
+        assert path is None  # private argument, only set by unix_connect()
+
+    if subprotocols is not None:
+        validate_subprotocols(subprotocols)
+
+    if compression == "deflate":
+        extensions = enable_client_permessage_deflate(extensions)
+    elif compression is not None:
+        raise ValueError(f"unsupported compression: {compression}")
+
+    # Calculate timeouts on the TCP, TLS, and WebSocket handshakes.
+    # The TCP and TLS timeouts must be set on the socket, then removed
+    # to avoid conflicting with the WebSocket timeout in handshake().
+    deadline = Deadline(open_timeout)
+
+    if create_connection is None:
+        create_connection = ClientConnection
+
+    try:
+        # Connect socket
+
+        if sock is None:
+            if unix:
+                sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
+                sock.settimeout(deadline.timeout())
+                assert path is not None  # validated above -- this is for mpypy
+                sock.connect(path)
+            else:
+                sock = socket.create_connection(
+                    (wsuri.host, wsuri.port),
+                    deadline.timeout(),
+                )
+            sock.settimeout(None)
+
+        # Disable Nagle algorithm
+
+        if not unix:
+            sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, True)
+
+        # Initialize TLS wrapper and perform TLS handshake
+
+        if wsuri.secure:
+            if ssl_context is None:
+                ssl_context = ssl.create_default_context()
+            if server_hostname is None:
+                server_hostname = wsuri.host
+            sock.settimeout(deadline.timeout())
+            sock = ssl_context.wrap_socket(sock, server_hostname=server_hostname)
+            sock.settimeout(None)
+
+        # Initialize WebSocket connection
+
+        protocol = ClientProtocol(
+            wsuri,
+            origin=origin,
+            extensions=extensions,
+            subprotocols=subprotocols,
+            state=CONNECTING,
+            max_size=max_size,
+            logger=logger,
+        )
+
+        # Initialize WebSocket protocol
+
+        connection = create_connection(
+            sock,
+            protocol,
+            close_timeout=close_timeout,
+        )
+        # On failure, handshake() closes the socket and raises an exception.
+        connection.handshake(
+            additional_headers,
+            user_agent_header,
+            deadline.timeout(),
+        )
+
+    except Exception:
+        if sock is not None:
+            sock.close()
+        raise
+
+    return connection
+
+
+def unix_connect(
+    path: Optional[str] = None,
+    uri: Optional[str] = None,
+    **kwargs: Any,
+) -> ClientConnection:
+    """
+    Connect to a WebSocket server listening on a Unix socket.
+
+    This function is identical to :func:`connect`, except for the additional
+    ``path`` argument. It's only available on Unix.
+
+    It's mainly useful for debugging servers listening on Unix sockets.
+
+    Args:
+        path: File system path to the Unix socket.
+        uri: URI of the WebSocket server. ``uri`` defaults to
+            ``ws://localhost/`` or, when a ``ssl_context`` is provided, to
+            ``wss://localhost/``.
+
+    """
+    if uri is None:
+        if kwargs.get("ssl_context") is None:
+            uri = "ws://localhost/"
+        else:
+            uri = "wss://localhost/"
+    return connect(uri=uri, unix=True, path=path, **kwargs)

code/.venv/lib/python3.12/site-packages/websockets/sync/connection.py

@@ -0,0 +1,773 @@
+from __future__ import annotations
+
+import contextlib
+import logging
+import random
+import socket
+import struct
+import threading
+import uuid
+from types import TracebackType
+from typing import Any, Dict, Iterable, Iterator, Mapping, Optional, Type, Union
+
+from ..exceptions import ConnectionClosed, ConnectionClosedOK, ProtocolError
+from ..frames import DATA_OPCODES, BytesLike, CloseCode, Frame, Opcode, prepare_ctrl
+from ..http11 import Request, Response
+from ..protocol import CLOSED, OPEN, Event, Protocol, State
+from ..typing import Data, LoggerLike, Subprotocol
+from .messages import Assembler
+from .utils import Deadline
+
+
+__all__ = ["Connection"]
+
+logger = logging.getLogger(__name__)
+
+
+class Connection:
+    """
+    Threaded implementation of a WebSocket connection.
+
+    :class:`Connection` provides APIs shared between WebSocket servers and
+    clients.
+
+    You shouldn't use it directly. Instead, use
+    :class:`~websockets.sync.client.ClientConnection` or
+    :class:`~websockets.sync.server.ServerConnection`.
+
+    """
+
+    recv_bufsize = 65536
+
+    def __init__(
+        self,
+        socket: socket.socket,
+        protocol: Protocol,
+        *,
+        close_timeout: Optional[float] = 10,
+    ) -> None:
+        self.socket = socket
+        self.protocol = protocol
+        self.close_timeout = close_timeout
+
+        # Inject reference to this instance in the protocol's logger.
+        self.protocol.logger = logging.LoggerAdapter(
+            self.protocol.logger,
+            {"websocket": self},
+        )
+
+        # Copy attributes from the protocol for convenience.
+        self.id: uuid.UUID = self.protocol.id
+        """Unique identifier of the connection. Useful in logs."""
+        self.logger: LoggerLike = self.protocol.logger
+        """Logger for this connection."""
+        self.debug = self.protocol.debug
+
+        # HTTP handshake request and response.
+        self.request: Optional[Request] = None
+        """Opening handshake request."""
+        self.response: Optional[Response] = None
+        """Opening handshake response."""
+
+        # Mutex serializing interactions with the protocol.
+        self.protocol_mutex = threading.Lock()
+
+        # Assembler turning frames into messages and serializing reads.
+        self.recv_messages = Assembler()
+
+        # Whether we are busy sending a fragmented message.
+        self.send_in_progress = False
+
+        # Deadline for the closing handshake.
+        self.close_deadline: Optional[Deadline] = None
+
+        # Mapping of ping IDs to pong waiters, in chronological order.
+        self.pings: Dict[bytes, threading.Event] = {}
+
+        # Receiving events from the socket.
+        self.recv_events_thread = threading.Thread(target=self.recv_events)
+        self.recv_events_thread.start()
+
+        # Exception raised in recv_events, to be chained to ConnectionClosed
+        # in the user thread in order to show why the TCP connection dropped.
+        self.recv_events_exc: Optional[BaseException] = None
+
+    # Public attributes
+
+    @property
+    def local_address(self) -> Any:
+        """
+        Local address of the connection.
+
+        For IPv4 connections, this is a ``(host, port)`` tuple.
+
+        The format of the address depends on the address family.
+        See :meth:`~socket.socket.getsockname`.
+
+        """
+        return self.socket.getsockname()
+
+    @property
+    def remote_address(self) -> Any:
+        """
+        Remote address of the connection.
+
+        For IPv4 connections, this is a ``(host, port)`` tuple.
+
+        The format of the address depends on the address family.
+        See :meth:`~socket.socket.getpeername`.
+
+        """
+        return self.socket.getpeername()
+
+    @property
+    def subprotocol(self) -> Optional[Subprotocol]:
+        """
+        Subprotocol negotiated during the opening handshake.
+
+        :obj:`None` if no subprotocol was negotiated.
+
+        """
+        return self.protocol.subprotocol
+
+    # Public methods
+
+    def __enter__(self) -> Connection:
+        return self
+
+    def __exit__(
+        self,
+        exc_type: Optional[Type[BaseException]],
+        exc_value: Optional[BaseException],
+        traceback: Optional[TracebackType],
+    ) -> None:
+        if exc_type is None:
+            self.close()
+        else:
+            self.close(CloseCode.INTERNAL_ERROR)
+
+    def __iter__(self) -> Iterator[Data]:
+        """
+        Iterate on incoming messages.
+
+        The iterator calls :meth:`recv` and yields messages in an infinite loop.
+
+        It exits when the connection is closed normally. It raises a
+        :exc:`~websockets.exceptions.ConnectionClosedError` exception after a
+        protocol error or a network failure.
+
+        """
+        try:
+            while True:
+                yield self.recv()
+        except ConnectionClosedOK:
+            return
+
+    def recv(self, timeout: Optional[float] = None) -> Data:
+        """
+        Receive the next message.
+
+        When the connection is closed, :meth:`recv` raises
+        :exc:`~websockets.exceptions.ConnectionClosed`. Specifically, it raises
+        :exc:`~websockets.exceptions.ConnectionClosedOK` after a normal closure
+        and :exc:`~websockets.exceptions.ConnectionClosedError` after a protocol
+        error or a network failure. This is how you detect the end of the
+        message stream.
+
+        If ``timeout`` is :obj:`None`, block until a message is received. If
+        ``timeout`` is set and no message is received within ``timeout``
+        seconds, raise :exc:`TimeoutError`. Set ``timeout`` to ``0`` to check if
+        a message was already received.
+
+        If the message is fragmented, wait until all fragments are received,
+        reassemble them, and return the whole message.
+
+        Returns:
+            A string (:class:`str`) for a Text_ frame or a bytestring
+            (:class:`bytes`) for a Binary_ frame.
+
+            .. _Text: https://www.rfc-editor.org/rfc/rfc6455.html#section-5.6
+            .. _Binary: https://www.rfc-editor.org/rfc/rfc6455.html#section-5.6
+
+        Raises:
+            ConnectionClosed: When the connection is closed.
+            RuntimeError: If two threads call :meth:`recv` or
+                :meth:`recv_streaming` concurrently.
+
+        """
+        try:
+            return self.recv_messages.get(timeout)
+        except EOFError:
+            raise self.protocol.close_exc from self.recv_events_exc
+        except RuntimeError:
+            raise RuntimeError(
+                "cannot call recv while another thread "
+                "is already running recv or recv_streaming"
+            ) from None
+
+    def recv_streaming(self) -> Iterator[Data]:
+        """
+        Receive the next message frame by frame.
+
+        If the message is fragmented, yield each fragment as it is received.
+        The iterator must be fully consumed, or else the connection will become
+        unusable.
+
+        :meth:`recv_streaming` raises the same exceptions as :meth:`recv`.
+
+        Returns:
+            An iterator of strings (:class:`str`) for a Text_ frame or
+            bytestrings (:class:`bytes`) for a Binary_ frame.
+
+            .. _Text: https://www.rfc-editor.org/rfc/rfc6455.html#section-5.6
+            .. _Binary: https://www.rfc-editor.org/rfc/rfc6455.html#section-5.6
+
+        Raises:
+            ConnectionClosed: When the connection is closed.
+            RuntimeError: If two threads call :meth:`recv` or
+                :meth:`recv_streaming` concurrently.
+
+        """
+        try:
+            yield from self.recv_messages.get_iter()
+        except EOFError:
+            raise self.protocol.close_exc from self.recv_events_exc
+        except RuntimeError:
+            raise RuntimeError(
+                "cannot call recv_streaming while another thread "
+                "is already running recv or recv_streaming"
+            ) from None
+
+    def send(self, message: Union[Data, Iterable[Data]]) -> None:
+        """
+        Send a message.
+
+        A string (:class:`str`) is sent as a Text_ frame. A bytestring or
+        bytes-like object (:class:`bytes`, :class:`bytearray`, or
+        :class:`memoryview`) is sent as a Binary_ frame.
+
+        .. _Text: https://www.rfc-editor.org/rfc/rfc6455.html#section-5.6
+        .. _Binary: https://www.rfc-editor.org/rfc/rfc6455.html#section-5.6
+
+        :meth:`send` also accepts an iterable of strings, bytestrings, or
+        bytes-like objects to enable fragmentation_. Each item is treated as a
+        message fragment and sent in its own frame. All items must be of the
+        same type, or else :meth:`send` will raise a :exc:`TypeError` and the
+        connection will be closed.
+
+        .. _fragmentation: https://www.rfc-editor.org/rfc/rfc6455.html#section-5.4
+
+        :meth:`send` rejects dict-like objects because this is often an error.
+        (If you really want to send the keys of a dict-like object as fragments,
+        call its :meth:`~dict.keys` method and pass the result to :meth:`send`.)
+
+        When the connection is closed, :meth:`send` raises
+        :exc:`~websockets.exceptions.ConnectionClosed`. Specifically, it
+        raises :exc:`~websockets.exceptions.ConnectionClosedOK` after a normal
+        connection closure and
+        :exc:`~websockets.exceptions.ConnectionClosedError` after a protocol
+        error or a network failure.
+
+        Args:
+            message: Message to send.
+
+        Raises:
+            ConnectionClosed: When the connection is closed.
+            RuntimeError: If a connection is busy sending a fragmented message.
+            TypeError: If ``message`` doesn't have a supported type.
+
+        """
+        # Unfragmented message -- this case must be handled first because
+        # strings and bytes-like objects are iterable.
+
+        if isinstance(message, str):
+            with self.send_context():
+                if self.send_in_progress:
+                    raise RuntimeError(
+                        "cannot call send while another thread "
+                        "is already running send"
+                    )
+                self.protocol.send_text(message.encode("utf-8"))
+
+        elif isinstance(message, BytesLike):
+            with self.send_context():
+                if self.send_in_progress:
+                    raise RuntimeError(
+                        "cannot call send while another thread "
+                        "is already running send"
+                    )
+                self.protocol.send_binary(message)
+
+        # Catch a common mistake -- passing a dict to send().
+
+        elif isinstance(message, Mapping):
+            raise TypeError("data is a dict-like object")
+
+        # Fragmented message -- regular iterator.
+
+        elif isinstance(message, Iterable):
+            chunks = iter(message)
+            try:
+                chunk = next(chunks)
+            except StopIteration:
+                return
+
+            try:
+                # First fragment.
+                if isinstance(chunk, str):
+                    text = True
+                    with self.send_context():
+                        if self.send_in_progress:
+                            raise RuntimeError(
+                                "cannot call send while another thread "
+                                "is already running send"
+                            )
+                        self.send_in_progress = True
+                        self.protocol.send_text(
+                            chunk.encode("utf-8"),
+                            fin=False,
+                        )
+                elif isinstance(chunk, BytesLike):
+                    text = False
+                    with self.send_context():
+                        if self.send_in_progress:
+                            raise RuntimeError(
+                                "cannot call send while another thread "
+                                "is already running send"
+                            )
+                        self.send_in_progress = True
+                        self.protocol.send_binary(
+                            chunk,
+                            fin=False,
+                        )
+                else:
+                    raise TypeError("data iterable must contain bytes or str")
+
+                # Other fragments
+                for chunk in chunks:
+                    if isinstance(chunk, str) and text:
+                        with self.send_context():
+                            assert self.send_in_progress
+                            self.protocol.send_continuation(
+                                chunk.encode("utf-8"),
+                                fin=False,
+                            )
+                    elif isinstance(chunk, BytesLike) and not text:
+                        with self.send_context():
+                            assert self.send_in_progress
+                            self.protocol.send_continuation(
+                                chunk,
+                                fin=False,
+                            )
+                    else:
+                        raise TypeError("data iterable must contain uniform types")
+
+                # Final fragment.
+                with self.send_context():
+                    self.protocol.send_continuation(b"", fin=True)
+                    self.send_in_progress = False
+
+            except RuntimeError:
+                # We didn't start sending a fragmented message.
+                raise
+
+            except Exception:
+                # We're half-way through a fragmented message and we can't
+                # complete it. This makes the connection unusable.
+                with self.send_context():
+                    self.protocol.fail(
+                        CloseCode.INTERNAL_ERROR,
+                        "error in fragmented message",
+                    )
+                raise
+
+        else:
+            raise TypeError("data must be bytes, str, or iterable")
+
+    def close(self, code: int = CloseCode.NORMAL_CLOSURE, reason: str = "") -> None:
+        """
+        Perform the closing handshake.
+
+        :meth:`close` waits for the other end to complete the handshake, for the
+        TCP connection to terminate, and for all incoming messages to be read
+        with :meth:`recv`.
+
+        :meth:`close` is idempotent: it doesn't do anything once the
+        connection is closed.
+
+        Args:
+            code: WebSocket close code.
+            reason: WebSocket close reason.
+
+        """
+        try:
+            # The context manager takes care of waiting for the TCP connection
+            # to terminate after calling a method that sends a close frame.
+            with self.send_context():
+                if self.send_in_progress:
+                    self.protocol.fail(
+                        CloseCode.INTERNAL_ERROR,
+                        "close during fragmented message",
+                    )
+                else:
+                    self.protocol.send_close(code, reason)
+        except ConnectionClosed:
+            # Ignore ConnectionClosed exceptions raised from send_context().
+            # They mean that the connection is closed, which was the goal.
+            pass
+
+    def ping(self, data: Optional[Data] = None) -> threading.Event:
+        """
+        Send a Ping_.
+
+        .. _Ping: https://www.rfc-editor.org/rfc/rfc6455.html#section-5.5.2
+
+        A ping may serve as a keepalive or as a check that the remote endpoint
+        received all messages up to this point
+
+        Args:
+            data: Payload of the ping. A :class:`str` will be encoded to UTF-8.
+                If ``data`` is :obj:`None`, the payload is four random bytes.
+
+        Returns:
+            An event that will be set when the corresponding pong is received.
+            You can ignore it if you don't intend to wait.
+
+            ::
+
+                pong_event = ws.ping()
+                pong_event.wait()  # only if you want to wait for the pong
+
+        Raises:
+            ConnectionClosed: When the connection is closed.
+            RuntimeError: If another ping was sent with the same data and
+                the corresponding pong wasn't received yet.
+
+        """
+        if data is not None:
+            data = prepare_ctrl(data)
+
+        with self.send_context():
+            # Protect against duplicates if a payload is explicitly set.
+            if data in self.pings:
+                raise RuntimeError("already waiting for a pong with the same data")
+
+            # Generate a unique random payload otherwise.
+            while data is None or data in self.pings:
+                data = struct.pack("!I", random.getrandbits(32))
+
+            pong_waiter = threading.Event()
+            self.pings[data] = pong_waiter
+            self.protocol.send_ping(data)
+            return pong_waiter
+
+    def pong(self, data: Data = b"") -> None:
+        """
+        Send a Pong_.
+
+        .. _Pong: https://www.rfc-editor.org/rfc/rfc6455.html#section-5.5.3
+
+        An unsolicited pong may serve as a unidirectional heartbeat.
+
+        Args:
+            data: Payload of the pong. A :class:`str` will be encoded to UTF-8.
+
+        Raises:
+            ConnectionClosed: When the connection is closed.
+
+        """
+        data = prepare_ctrl(data)
+
+        with self.send_context():
+            self.protocol.send_pong(data)
+
+    # Private methods
+
+    def process_event(self, event: Event) -> None:
+        """
+        Process one incoming event.
+
+        This method is overridden in subclasses to handle the handshake.
+
+        """
+        assert isinstance(event, Frame)
+        if event.opcode in DATA_OPCODES:
+            self.recv_messages.put(event)
+
+        if event.opcode is Opcode.PONG:
+            self.acknowledge_pings(bytes(event.data))
+
+    def acknowledge_pings(self, data: bytes) -> None:
+        """
+        Acknowledge pings when receiving a pong.
+
+        """
+        with self.protocol_mutex:
+            # Ignore unsolicited pong.
+            if data not in self.pings:
+                return
+            # Sending a pong for only the most recent ping is legal.
+            # Acknowledge all previous pings too in that case.
+            ping_id = None
+            ping_ids = []
+            for ping_id, ping in self.pings.items():
+                ping_ids.append(ping_id)
+                ping.set()
+                if ping_id == data:
+                    break
+            else:
+                raise AssertionError("solicited pong not found in pings")
+            # Remove acknowledged pings from self.pings.
+            for ping_id in ping_ids:
+                del self.pings[ping_id]
+
+    def recv_events(self) -> None:
+        """
+        Read incoming data from the socket and process events.
+
+        Run this method in a thread as long as the connection is alive.
+
+        ``recv_events()`` exits immediately when the ``self.socket`` is closed.
+
+        """
+        try:
+            while True:
+                try:
+                    if self.close_deadline is not None:
+                        self.socket.settimeout(self.close_deadline.timeout())
+                    data = self.socket.recv(self.recv_bufsize)
+                except Exception as exc:
+                    if self.debug:
+                        self.logger.debug("error while receiving data", exc_info=True)
+                    # When the closing handshake is initiated by our side,
+                    # recv() may block until send_context() closes the socket.
+                    # In that case, send_context() already set recv_events_exc.
+                    # Calling set_recv_events_exc() avoids overwriting it.
+                    with self.protocol_mutex:
+                        self.set_recv_events_exc(exc)
+                    break
+
+                if data == b"":
+                    break
+
+                # Acquire the connection lock.
+                with self.protocol_mutex:
+                    # Feed incoming data to the connection.
+                    self.protocol.receive_data(data)
+
+                    # This isn't expected to raise an exception.
+                    events = self.protocol.events_received()
+
+                    # Write outgoing data to the socket.
+                    try:
+                        self.send_data()
+                    except Exception as exc:
+                        if self.debug:
+                            self.logger.debug("error while sending data", exc_info=True)
+                        # Similarly to the above, avoid overriding an exception
+                        # set by send_context(), in case of a race condition
+                        # i.e. send_context() closes the socket after recv()
+                        # returns above but before send_data() calls send().
+                        self.set_recv_events_exc(exc)
+                        break
+
+                    if self.protocol.close_expected():
+                        # If the connection is expected to close soon, set the
+                        # close deadline based on the close timeout.
+                        if self.close_deadline is None:
+                            self.close_deadline = Deadline(self.close_timeout)
+
+                # Unlock conn_mutex before processing events. Else, the
+                # application can't send messages in response to events.
+
+                # If self.send_data raised an exception, then events are lost.
+                # Given that automatic responses write small amounts of data,
+                # this should be uncommon, so we don't handle the edge case.
+
+                try:
+                    for event in events:
+                        # This may raise EOFError if the closing handshake
+                        # times out while a message is waiting to be read.
+                        self.process_event(event)
+                except EOFError:
+                    break
+
+            # Breaking out of the while True: ... loop means that we believe
+            # that the socket doesn't work anymore.
+            with self.protocol_mutex:
+                # Feed the end of the data stream to the connection.
+                self.protocol.receive_eof()
+
+                # This isn't expected to generate events.
+                assert not self.protocol.events_received()
+
+                # There is no error handling because send_data() can only write
+                # the end of the data stream here and it handles errors itself.
+                self.send_data()
+
+        except Exception as exc:
+            # This branch should never run. It's a safety net in case of bugs.
+            self.logger.error("unexpected internal error", exc_info=True)
+            with self.protocol_mutex:
+                self.set_recv_events_exc(exc)
+            # We don't know where we crashed. Force protocol state to CLOSED.
+            self.protocol.state = CLOSED
+        finally:
+            # This isn't expected to raise an exception.
+            self.close_socket()
+
+    @contextlib.contextmanager
+    def send_context(
+        self,
+        *,
+        expected_state: State = OPEN,  # CONNECTING during the opening handshake
+    ) -> Iterator[None]:
+        """
+        Create a context for writing to the connection from user code.
+
+        On entry, :meth:`send_context` acquires the connection lock and checks
+        that the connection is open; on exit, it writes outgoing data to the
+        socket::
+
+            with self.send_context():
+                self.protocol.send_text(message.encode("utf-8"))
+
+        When the connection isn't open on entry, when the connection is expected
+        to close on exit, or when an unexpected error happens, terminating the
+        connection, :meth:`send_context` waits until the connection is closed
+        then raises :exc:`~websockets.exceptions.ConnectionClosed`.
+
+        """
+        # Should we wait until the connection is closed?
+        wait_for_close = False
+        # Should we close the socket and raise ConnectionClosed?
+        raise_close_exc = False
+        # What exception should we chain ConnectionClosed to?
+        original_exc: Optional[BaseException] = None
+
+        # Acquire the protocol lock.
+        with self.protocol_mutex:
+            if self.protocol.state is expected_state:
+                # Let the caller interact with the protocol.
+                try:
+                    yield
+                except (ProtocolError, RuntimeError):
+                    # The protocol state wasn't changed. Exit immediately.
+                    raise
+                except Exception as exc:
+                    self.logger.error("unexpected internal error", exc_info=True)
+                    # This branch should never run. It's a safety net in case of
+                    # bugs. Since we don't know what happened, we will close the
+                    # connection and raise the exception to the caller.
+                    wait_for_close = False
+                    raise_close_exc = True
+                    original_exc = exc
+                else:
+                    # Check if the connection is expected to close soon.
+                    if self.protocol.close_expected():
+                        wait_for_close = True
+                        # If the connection is expected to close soon, set the
+                        # close deadline based on the close timeout.
+
+                        # Since we tested earlier that protocol.state was OPEN
+                        # (or CONNECTING) and we didn't release protocol_mutex,
+                        # it is certain that self.close_deadline is still None.
+                        assert self.close_deadline is None
+                        self.close_deadline = Deadline(self.close_timeout)
+                    # Write outgoing data to the socket.
+                    try:
+                        self.send_data()
+                    except Exception as exc:
+                        if self.debug:
+                            self.logger.debug("error while sending data", exc_info=True)
+                        # While the only expected exception here is OSError,
+                        # other exceptions would be treated identically.
+                        wait_for_close = False
+                        raise_close_exc = True
+                        original_exc = exc
+
+            else:  # self.protocol.state is not expected_state
+                # Minor layering violation: we assume that the connection
+                # will be closing soon if it isn't in the expected state.
+                wait_for_close = True
+                raise_close_exc = True
+
+        # To avoid a deadlock, release the connection lock by exiting the
+        # context manager before waiting for recv_events() to terminate.
+
+        # If the connection is expected to close soon and the close timeout
+        # elapses, close the socket to terminate the connection.
+        if wait_for_close:
+            if self.close_deadline is None:
+                timeout = self.close_timeout
+            else:
+                # Thread.join() returns immediately if timeout is negative.
+                timeout = self.close_deadline.timeout(raise_if_elapsed=False)
+            self.recv_events_thread.join(timeout)
+
+            if self.recv_events_thread.is_alive():
+                # There's no risk to overwrite another error because
+                # original_exc is never set when wait_for_close is True.
+                assert original_exc is None
+                original_exc = TimeoutError("timed out while closing connection")
+                # Set recv_events_exc before closing the socket in order to get
+                # proper exception reporting.
+                raise_close_exc = True
+                with self.protocol_mutex:
+                    self.set_recv_events_exc(original_exc)
+
+        # If an error occurred, close the socket to terminate the connection and
+        # raise an exception.
+        if raise_close_exc:
+            self.close_socket()
+            self.recv_events_thread.join()
+            raise self.protocol.close_exc from original_exc
+
+    def send_data(self) -> None:
+        """
+        Send outgoing data.
+
+        This method requires holding protocol_mutex.
+
+        Raises:
+            OSError: When a socket operations fails.
+
+        """
+        assert self.protocol_mutex.locked()
+        for data in self.protocol.data_to_send():
+            if data:
+                if self.close_deadline is not None:
+                    self.socket.settimeout(self.close_deadline.timeout())
+                self.socket.sendall(data)
+            else:
+                try:
+                    self.socket.shutdown(socket.SHUT_WR)
+                except OSError:  # socket already closed
+                    pass
+
+    def set_recv_events_exc(self, exc: Optional[BaseException]) -> None:
+        """
+        Set recv_events_exc, if not set yet.
+
+        This method requires holding protocol_mutex.
+
+        """
+        assert self.protocol_mutex.locked()
+        if self.recv_events_exc is None:
+            self.recv_events_exc = exc
+
+    def close_socket(self) -> None:
+        """
+        Shutdown and close socket. Close message assembler.
+
+        Calling close_socket() guarantees that recv_events() terminates. Indeed,
+        recv_events() may block only on socket.recv() or on recv_messages.put().
+
+        """
+        # shutdown() is required to interrupt recv() on Linux.
+        try:
+            self.socket.shutdown(socket.SHUT_RDWR)
+        except OSError:
+            pass  # socket is already closed
+        self.socket.close()
+        self.recv_messages.close()

code/.venv/lib/python3.12/site-packages/websockets/sync/messages.py

@@ -0,0 +1,281 @@
+from __future__ import annotations
+
+import codecs
+import queue
+import threading
+from typing import Iterator, List, Optional, cast
+
+from ..frames import Frame, Opcode
+from ..typing import Data
+
+
+__all__ = ["Assembler"]
+
+UTF8Decoder = codecs.getincrementaldecoder("utf-8")
+
+
+class Assembler:
+    """
+    Assemble messages from frames.
+
+    """
+
+    def __init__(self) -> None:
+        # Serialize reads and writes -- except for reads via synchronization
+        # primitives provided by the threading and queue modules.
+        self.mutex = threading.Lock()
+
+        # We create a latch with two events to ensure proper interleaving of
+        # writing and reading messages.
+        # put() sets this event to tell get() that a message can be fetched.
+        self.message_complete = threading.Event()
+        # get() sets this event to let put() that the message was fetched.
+        self.message_fetched = threading.Event()
+
+        # This flag prevents concurrent calls to get() by user code.
+        self.get_in_progress = False
+        # This flag prevents concurrent calls to put() by library code.
+        self.put_in_progress = False
+
+        # Decoder for text frames, None for binary frames.
+        self.decoder: Optional[codecs.IncrementalDecoder] = None
+
+        # Buffer of frames belonging to the same message.
+        self.chunks: List[Data] = []
+
+        # When switching from "buffering" to "streaming", we use a thread-safe
+        # queue for transferring frames from the writing thread (library code)
+        # to the reading thread (user code). We're buffering when chunks_queue
+        # is None and streaming when it's a SimpleQueue. None is a sentinel
+        # value marking the end of the stream, superseding message_complete.
+
+        # Stream data from frames belonging to the same message.
+        # Remove quotes around type when dropping Python < 3.9.
+        self.chunks_queue: Optional["queue.SimpleQueue[Optional[Data]]"] = None
+
+        # This flag marks the end of the stream.
+        self.closed = False
+
+    def get(self, timeout: Optional[float] = None) -> Data:
+        """
+        Read the next message.
+
+        :meth:`get` returns a single :class:`str` or :class:`bytes`.
+
+        If the message is fragmented, :meth:`get` waits until the last frame is
+        received, then it reassembles the message and returns it. To receive
+        messages frame by frame, use :meth:`get_iter` instead.
+
+        Args:
+            timeout: If a timeout is provided and elapses before a complete
+                message is received, :meth:`get` raises :exc:`TimeoutError`.
+
+        Raises:
+            EOFError: If the stream of frames has ended.
+            RuntimeError: If two threads run :meth:`get` or :meth:``get_iter`
+                concurrently.
+
+        """
+        with self.mutex:
+            if self.closed:
+                raise EOFError("stream of frames ended")
+
+            if self.get_in_progress:
+                raise RuntimeError("get or get_iter is already running")
+
+            self.get_in_progress = True
+
+        # If the message_complete event isn't set yet, release the lock to
+        # allow put() to run and eventually set it.
+        # Locking with get_in_progress ensures only one thread can get here.
+        completed = self.message_complete.wait(timeout)
+
+        with self.mutex:
+            self.get_in_progress = False
+
+            # Waiting for a complete message timed out.
+            if not completed:
+                raise TimeoutError(f"timed out in {timeout:.1f}s")
+
+            # get() was unblocked by close() rather than put().
+            if self.closed:
+                raise EOFError("stream of frames ended")
+
+            assert self.message_complete.is_set()
+            self.message_complete.clear()
+
+            joiner: Data = b"" if self.decoder is None else ""
+            # mypy cannot figure out that chunks have the proper type.
+            message: Data = joiner.join(self.chunks)  # type: ignore
+
+            assert not self.message_fetched.is_set()
+            self.message_fetched.set()
+
+            self.chunks = []
+            assert self.chunks_queue is None
+
+            return message
+
+    def get_iter(self) -> Iterator[Data]:
+        """
+        Stream the next message.
+
+        Iterating the return value of :meth:`get_iter` yields a :class:`str` or
+        :class:`bytes` for each frame in the message.
+
+        The iterator must be fully consumed before calling :meth:`get_iter` or
+        :meth:`get` again. Else, :exc:`RuntimeError` is raised.
+
+        This method only makes sense for fragmented messages. If messages aren't
+        fragmented, use :meth:`get` instead.
+
+        Raises:
+            EOFError: If the stream of frames has ended.
+            RuntimeError: If two threads run :meth:`get` or :meth:``get_iter`
+                concurrently.
+
+        """
+        with self.mutex:
+            if self.closed:
+                raise EOFError("stream of frames ended")
+
+            if self.get_in_progress:
+                raise RuntimeError("get or get_iter is already running")
+
+            chunks = self.chunks
+            self.chunks = []
+            self.chunks_queue = cast(
+                # Remove quotes around type when dropping Python < 3.9.
+                "queue.SimpleQueue[Optional[Data]]",
+                queue.SimpleQueue(),
+            )
+
+            # Sending None in chunk_queue supersedes setting message_complete
+            # when switching to "streaming". If message is already complete
+            # when the switch happens, put() didn't send None, so we have to.
+            if self.message_complete.is_set():
+                self.chunks_queue.put(None)
+
+            self.get_in_progress = True
+
+        # Locking with get_in_progress ensures only one thread can get here.
+        yield from chunks
+        while True:
+            chunk = self.chunks_queue.get()
+            if chunk is None:
+                break
+            yield chunk
+
+        with self.mutex:
+            self.get_in_progress = False
+
+            assert self.message_complete.is_set()
+            self.message_complete.clear()
+
+            # get_iter() was unblocked by close() rather than put().
+            if self.closed:
+                raise EOFError("stream of frames ended")
+
+            assert not self.message_fetched.is_set()
+            self.message_fetched.set()
+
+            assert self.chunks == []
+            self.chunks_queue = None
+
+    def put(self, frame: Frame) -> None:
+        """
+        Add ``frame`` to the next message.
+
+        When ``frame`` is the final frame in a message, :meth:`put` waits until
+        the message is fetched, either by calling :meth:`get` or by fully
+        consuming the return value of :meth:`get_iter`.
+
+        :meth:`put` assumes that the stream of frames respects the protocol. If
+        it doesn't, the behavior is undefined.
+
+        Raises:
+            EOFError: If the stream of frames has ended.
+            RuntimeError: If two threads run :meth:`put` concurrently.
+
+        """
+        with self.mutex:
+            if self.closed:
+                raise EOFError("stream of frames ended")
+
+            if self.put_in_progress:
+                raise RuntimeError("put is already running")
+
+            if frame.opcode is Opcode.TEXT:
+                self.decoder = UTF8Decoder(errors="strict")
+            elif frame.opcode is Opcode.BINARY:
+                self.decoder = None
+            elif frame.opcode is Opcode.CONT:
+                pass
+            else:
+                # Ignore control frames.
+                return
+
+            data: Data
+            if self.decoder is not None:
+                data = self.decoder.decode(frame.data, frame.fin)
+            else:
+                data = frame.data
+
+            if self.chunks_queue is None:
+                self.chunks.append(data)
+            else:
+                self.chunks_queue.put(data)
+
+            if not frame.fin:
+                return
+
+            # Message is complete. Wait until it's fetched to return.
+
+            assert not self.message_complete.is_set()
+            self.message_complete.set()
+
+            if self.chunks_queue is not None:
+                self.chunks_queue.put(None)
+
+            assert not self.message_fetched.is_set()
+
+            self.put_in_progress = True
+
+        # Release the lock to allow get() to run and eventually set the event.
+        self.message_fetched.wait()
+
+        with self.mutex:
+            self.put_in_progress = False
+
+            assert self.message_fetched.is_set()
+            self.message_fetched.clear()
+
+            # put() was unblocked by close() rather than get() or get_iter().
+            if self.closed:
+                raise EOFError("stream of frames ended")
+
+            self.decoder = None
+
+    def close(self) -> None:
+        """
+        End the stream of frames.
+
+        Callling :meth:`close` concurrently with :meth:`get`, :meth:`get_iter`,
+        or :meth:`put` is safe. They will raise :exc:`EOFError`.
+
+        """
+        with self.mutex:
+            if self.closed:
+                return
+
+            self.closed = True
+
+            # Unblock get or get_iter.
+            if self.get_in_progress:
+                self.message_complete.set()
+                if self.chunks_queue is not None:
+                    self.chunks_queue.put(None)
+
+            # Unblock put().
+            if self.put_in_progress:
+                self.message_fetched.set()

code/.venv/lib/python3.12/site-packages/websockets/sync/server.py

@@ -0,0 +1,530 @@
+from __future__ import annotations
+
+import http
+import logging
+import os
+import selectors
+import socket
+import ssl
+import sys
+import threading
+from types import TracebackType
+from typing import Any, Callable, Optional, Sequence, Type
+
+from websockets.frames import CloseCode
+
+from ..extensions.base import ServerExtensionFactory
+from ..extensions.permessage_deflate import enable_server_permessage_deflate
+from ..headers import validate_subprotocols
+from ..http import USER_AGENT
+from ..http11 import Request, Response
+from ..protocol import CONNECTING, OPEN, Event
+from ..server import ServerProtocol
+from ..typing import LoggerLike, Origin, Subprotocol
+from .connection import Connection
+from .utils import Deadline
+
+
+__all__ = ["serve", "unix_serve", "ServerConnection", "WebSocketServer"]
+
+
+class ServerConnection(Connection):
+    """
+    Threaded implementation of a WebSocket server connection.
+
+    :class:`ServerConnection` provides :meth:`recv` and :meth:`send` methods for
+    receiving and sending messages.
+
+    It supports iteration to receive messages::
+
+        for message in websocket:
+            process(message)
+
+    The iterator exits normally when the connection is closed with close code
+    1000 (OK) or 1001 (going away) or without a close code. It raises a
+    :exc:`~websockets.exceptions.ConnectionClosedError` when the connection is
+    closed with any other code.
+
+    Args:
+        socket: Socket connected to a WebSocket client.
+        protocol: Sans-I/O connection.
+        close_timeout: Timeout for closing the connection in seconds.
+
+    """
+
+    def __init__(
+        self,
+        socket: socket.socket,
+        protocol: ServerProtocol,
+        *,
+        close_timeout: Optional[float] = 10,
+    ) -> None:
+        self.protocol: ServerProtocol
+        self.request_rcvd = threading.Event()
+        super().__init__(
+            socket,
+            protocol,
+            close_timeout=close_timeout,
+        )
+
+    def handshake(
+        self,
+        process_request: Optional[
+            Callable[
+                [ServerConnection, Request],
+                Optional[Response],
+            ]
+        ] = None,
+        process_response: Optional[
+            Callable[
+                [ServerConnection, Request, Response],
+                Optional[Response],
+            ]
+        ] = None,
+        server_header: Optional[str] = USER_AGENT,
+        timeout: Optional[float] = None,
+    ) -> None:
+        """
+        Perform the opening handshake.
+
+        """
+        if not self.request_rcvd.wait(timeout):
+            self.close_socket()
+            self.recv_events_thread.join()
+            raise TimeoutError("timed out during handshake")
+
+        if self.request is None:
+            self.close_socket()
+            self.recv_events_thread.join()
+            raise ConnectionError("connection closed during handshake")
+
+        with self.send_context(expected_state=CONNECTING):
+            self.response = None
+
+            if process_request is not None:
+                try:
+                    self.response = process_request(self, self.request)
+                except Exception as exc:
+                    self.protocol.handshake_exc = exc
+                    self.logger.error("opening handshake failed", exc_info=True)
+                    self.response = self.protocol.reject(
+                        http.HTTPStatus.INTERNAL_SERVER_ERROR,
+                        (
+                            "Failed to open a WebSocket connection.\n"
+                            "See server log for more information.\n"
+                        ),
+                    )
+
+            if self.response is None:
+                self.response = self.protocol.accept(self.request)
+
+            if server_header is not None:
+                self.response.headers["Server"] = server_header
+
+            if process_response is not None:
+                try:
+                    response = process_response(self, self.request, self.response)
+                except Exception as exc:
+                    self.protocol.handshake_exc = exc
+                    self.logger.error("opening handshake failed", exc_info=True)
+                    self.response = self.protocol.reject(
+                        http.HTTPStatus.INTERNAL_SERVER_ERROR,
+                        (
+                            "Failed to open a WebSocket connection.\n"
+                            "See server log for more information.\n"
+                        ),
+                    )
+                else:
+                    if response is not None:
+                        self.response = response
+
+            self.protocol.send_response(self.response)
+
+        if self.protocol.state is not OPEN:
+            self.recv_events_thread.join(self.close_timeout)
+            self.close_socket()
+            self.recv_events_thread.join()
+
+        if self.protocol.handshake_exc is not None:
+            raise self.protocol.handshake_exc
+
+    def process_event(self, event: Event) -> None:
+        """
+        Process one incoming event.
+
+        """
+        # First event - handshake request.
+        if self.request is None:
+            assert isinstance(event, Request)
+            self.request = event
+            self.request_rcvd.set()
+        # Later events - frames.
+        else:
+            super().process_event(event)
+
+    def recv_events(self) -> None:
+        """
+        Read incoming data from the socket and process events.
+
+        """
+        try:
+            super().recv_events()
+        finally:
+            # If the connection is closed during the handshake, unblock it.
+            self.request_rcvd.set()
+
+
+class WebSocketServer:
+    """
+    WebSocket server returned by :func:`serve`.
+
+    This class mirrors the API of :class:`~socketserver.BaseServer`, notably the
+    :meth:`~socketserver.BaseServer.serve_forever` and
+    :meth:`~socketserver.BaseServer.shutdown` methods, as well as the context
+    manager protocol.
+
+    Args:
+        socket: Server socket listening for new connections.
+        handler: Handler for one connection. Receives the socket and address
+            returned by :meth:`~socket.socket.accept`.
+        logger: Logger for this server.
+
+    """
+
+    def __init__(
+        self,
+        socket: socket.socket,
+        handler: Callable[[socket.socket, Any], None],
+        logger: Optional[LoggerLike] = None,
+    ):
+        self.socket = socket
+        self.handler = handler
+        if logger is None:
+            logger = logging.getLogger("websockets.server")
+        self.logger = logger
+        if sys.platform != "win32":
+            self.shutdown_watcher, self.shutdown_notifier = os.pipe()
+
+    def serve_forever(self) -> None:
+        """
+        See :meth:`socketserver.BaseServer.serve_forever`.
+
+        This method doesn't return. Calling :meth:`shutdown` from another thread
+        stops the server.
+
+        Typical use::
+
+            with serve(...) as server:
+                server.serve_forever()
+
+        """
+        poller = selectors.DefaultSelector()
+        poller.register(self.socket, selectors.EVENT_READ)
+        if sys.platform != "win32":
+            poller.register(self.shutdown_watcher, selectors.EVENT_READ)
+
+        while True:
+            poller.select()
+            try:
+                # If the socket is closed, this will raise an exception and exit
+                # the loop. So we don't need to check the return value of select().
+                sock, addr = self.socket.accept()
+            except OSError:
+                break
+            thread = threading.Thread(target=self.handler, args=(sock, addr))
+            thread.start()
+
+    def shutdown(self) -> None:
+        """
+        See :meth:`socketserver.BaseServer.shutdown`.
+
+        """
+        self.socket.close()
+        if sys.platform != "win32":
+            os.write(self.shutdown_notifier, b"x")
+
+    def fileno(self) -> int:
+        """
+        See :meth:`socketserver.BaseServer.fileno`.
+
+        """
+        return self.socket.fileno()
+
+    def __enter__(self) -> WebSocketServer:
+        return self
+
+    def __exit__(
+        self,
+        exc_type: Optional[Type[BaseException]],
+        exc_value: Optional[BaseException],
+        traceback: Optional[TracebackType],
+    ) -> None:
+        self.shutdown()
+
+
+def serve(
+    handler: Callable[[ServerConnection], None],
+    host: Optional[str] = None,
+    port: Optional[int] = None,
+    *,
+    # TCP/TLS — unix and path are only for unix_serve()
+    sock: Optional[socket.socket] = None,
+    ssl_context: Optional[ssl.SSLContext] = None,
+    unix: bool = False,
+    path: Optional[str] = None,
+    # WebSocket
+    origins: Optional[Sequence[Optional[Origin]]] = None,
+    extensions: Optional[Sequence[ServerExtensionFactory]] = None,
+    subprotocols: Optional[Sequence[Subprotocol]] = None,
+    select_subprotocol: Optional[
+        Callable[
+            [ServerConnection, Sequence[Subprotocol]],
+            Optional[Subprotocol],
+        ]
+    ] = None,
+    process_request: Optional[
+        Callable[
+            [ServerConnection, Request],
+            Optional[Response],
+        ]
+    ] = None,
+    process_response: Optional[
+        Callable[
+            [ServerConnection, Request, Response],
+            Optional[Response],
+        ]
+    ] = None,
+    server_header: Optional[str] = USER_AGENT,
+    compression: Optional[str] = "deflate",
+    # Timeouts
+    open_timeout: Optional[float] = 10,
+    close_timeout: Optional[float] = 10,
+    # Limits
+    max_size: Optional[int] = 2**20,
+    # Logging
+    logger: Optional[LoggerLike] = None,
+    # Escape hatch for advanced customization
+    create_connection: Optional[Type[ServerConnection]] = None,
+) -> WebSocketServer:
+    """
+    Create a WebSocket server listening on ``host`` and ``port``.
+
+    Whenever a client connects, the server creates a :class:`ServerConnection`,
+    performs the opening handshake, and delegates to the ``handler``.
+
+    The handler receives a :class:`ServerConnection` instance, which you can use
+    to send and receive messages.
+
+    Once the handler completes, either normally or with an exception, the server
+    performs the closing handshake and closes the connection.
+
+    :class:`WebSocketServer` mirrors the API of
+    :class:`~socketserver.BaseServer`. Treat it as a context manager to ensure
+    that it will be closed and call the :meth:`~WebSocketServer.serve_forever`
+    method to serve requests::
+
+        def handler(websocket):
+            ...
+
+        with websockets.sync.server.serve(handler, ...) as server:
+            server.serve_forever()
+
+    Args:
+        handler: Connection handler. It receives the WebSocket connection,
+            which is a :class:`ServerConnection`, in argument.
+        host: Network interfaces the server binds to.
+            See :func:`~socket.create_server` for details.
+        port: TCP port the server listens on.
+            See :func:`~socket.create_server` for details.
+        sock: Preexisting TCP socket. ``sock`` replaces ``host`` and ``port``.
+            You may call :func:`socket.create_server` to create a suitable TCP
+            socket.
+        ssl_context: Configuration for enabling TLS on the connection.
+        origins: Acceptable values of the ``Origin`` header, for defending
+            against Cross-Site WebSocket Hijacking attacks. Include :obj:`None`
+            in the list if the lack of an origin is acceptable.
+        extensions: List of supported extensions, in order in which they
+            should be negotiated and run.
+        subprotocols: List of supported subprotocols, in order of decreasing
+            preference.
+        select_subprotocol: Callback for selecting a subprotocol among
+            those supported by the client and the server. It receives a
+            :class:`ServerConnection` (not a
+            :class:`~websockets.server.ServerProtocol`!) instance and a list of
+            subprotocols offered by the client. Other than the first argument,
+            it has the same behavior as the
+            :meth:`ServerProtocol.select_subprotocol
+            <websockets.server.ServerProtocol.select_subprotocol>` method.
+        process_request: Intercept the request during the opening handshake.
+            Return an HTTP response to force the response or :obj:`None` to
+            continue normally. When you force an HTTP 101 Continue response,
+            the handshake is successful. Else, the connection is aborted.
+        process_response: Intercept the response during the opening handshake.
+            Return an HTTP response to force the response or :obj:`None` to
+            continue normally. When you force an HTTP 101 Continue response,
+            the handshake is successful. Else, the connection is aborted.
+        server_header: Value of  the ``Server`` response header.
+            It defaults to ``"Python/x.y.z websockets/X.Y"``. Setting it to
+            :obj:`None` removes the header.
+        compression: The "permessage-deflate" extension is enabled by default.
+            Set ``compression`` to :obj:`None` to disable it. See the
+            :doc:`compression guide <../../topics/compression>` for details.
+        open_timeout: Timeout for opening connections in seconds.
+            :obj:`None` disables the timeout.
+        close_timeout: Timeout for closing connections in seconds.
+            :obj:`None` disables the timeout.
+        max_size: Maximum size of incoming messages in bytes.
+            :obj:`None` disables the limit.
+        logger: Logger for this server.
+            It defaults to ``logging.getLogger("websockets.server")``. See the
+            :doc:`logging guide <../../topics/logging>` for details.
+        create_connection: Factory for the :class:`ServerConnection` managing
+            the connection. Set it to a wrapper or a subclass to customize
+            connection handling.
+    """
+
+    # Process parameters
+
+    if subprotocols is not None:
+        validate_subprotocols(subprotocols)
+
+    if compression == "deflate":
+        extensions = enable_server_permessage_deflate(extensions)
+    elif compression is not None:
+        raise ValueError(f"unsupported compression: {compression}")
+
+    if create_connection is None:
+        create_connection = ServerConnection
+
+    # Bind socket and listen
+
+    if sock is None:
+        if unix:
+            if path is None:
+                raise TypeError("missing path argument")
+            sock = socket.create_server(path, family=socket.AF_UNIX)
+        else:
+            sock = socket.create_server((host, port))
+    else:
+        if path is not None:
+            raise TypeError("path and sock arguments are incompatible")
+
+    # Initialize TLS wrapper
+
+    if ssl_context is not None:
+        sock = ssl_context.wrap_socket(
+            sock,
+            server_side=True,
+            # Delay TLS handshake until after we set a timeout on the socket.
+            do_handshake_on_connect=False,
+        )
+
+    # Define request handler
+
+    def conn_handler(sock: socket.socket, addr: Any) -> None:
+        # Calculate timeouts on the TLS and WebSocket handshakes.
+        # The TLS timeout must be set on the socket, then removed
+        # to avoid conflicting with the WebSocket timeout in handshake().
+        deadline = Deadline(open_timeout)
+
+        try:
+            # Disable Nagle algorithm
+
+            if not unix:
+                sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, True)
+
+            # Perform TLS handshake
+
+            if ssl_context is not None:
+                sock.settimeout(deadline.timeout())
+                assert isinstance(sock, ssl.SSLSocket)  # mypy cannot figure this out
+                sock.do_handshake()
+                sock.settimeout(None)
+
+            # Create a closure so that select_subprotocol has access to self.
+
+            protocol_select_subprotocol: Optional[
+                Callable[
+                    [ServerProtocol, Sequence[Subprotocol]],
+                    Optional[Subprotocol],
+                ]
+            ] = None
+
+            if select_subprotocol is not None:
+
+                def protocol_select_subprotocol(
+                    protocol: ServerProtocol,
+                    subprotocols: Sequence[Subprotocol],
+                ) -> Optional[Subprotocol]:
+                    # mypy doesn't know that select_subprotocol is immutable.
+                    assert select_subprotocol is not None
+                    # Ensure this function is only used in the intended context.
+                    assert protocol is connection.protocol
+                    return select_subprotocol(connection, subprotocols)
+
+            # Initialize WebSocket connection
+
+            protocol = ServerProtocol(
+                origins=origins,
+                extensions=extensions,
+                subprotocols=subprotocols,
+                select_subprotocol=protocol_select_subprotocol,
+                state=CONNECTING,
+                max_size=max_size,
+                logger=logger,
+            )
+
+            # Initialize WebSocket protocol
+
+            assert create_connection is not None  # help mypy
+            connection = create_connection(
+                sock,
+                protocol,
+                close_timeout=close_timeout,
+            )
+            # On failure, handshake() closes the socket, raises an exception, and
+            # logs it.
+            connection.handshake(
+                process_request,
+                process_response,
+                server_header,
+                deadline.timeout(),
+            )
+
+        except Exception:
+            sock.close()
+            return
+
+        try:
+            handler(connection)
+        except Exception:
+            protocol.logger.error("connection handler failed", exc_info=True)
+            connection.close(CloseCode.INTERNAL_ERROR)
+        else:
+            connection.close()
+
+    # Initialize server
+
+    return WebSocketServer(sock, conn_handler, logger)
+
+
+def unix_serve(
+    handler: Callable[[ServerConnection], Any],
+    path: Optional[str] = None,
+    **kwargs: Any,
+) -> WebSocketServer:
+    """
+    Create a WebSocket server listening on a Unix socket.
+
+    This function is identical to :func:`serve`, except the ``host`` and
+    ``port`` arguments are replaced by ``path``. It's only available on Unix.
+
+    It's useful for deploying a server behind a reverse proxy such as nginx.
+
+    Args:
+        handler: Connection handler. It receives the WebSocket connection,
+            which is a :class:`ServerConnection`, in argument.
+        path: File system path to the Unix socket.
+
+    """
+    return serve(handler, path=path, unix=True, **kwargs)

code/.venv/lib/python3.12/site-packages/websockets/sync/utils.py

@@ -0,0 +1,46 @@
+from __future__ import annotations
+
+import time
+from typing import Optional
+
+
+__all__ = ["Deadline"]
+
+
+class Deadline:
+    """
+    Manage timeouts across multiple steps.
+
+    Args:
+        timeout: Time available in seconds or :obj:`None` if there is no limit.
+
+    """
+
+    def __init__(self, timeout: Optional[float]) -> None:
+        self.deadline: Optional[float]
+        if timeout is None:
+            self.deadline = None
+        else:
+            self.deadline = time.monotonic() + timeout
+
+    def timeout(self, *, raise_if_elapsed: bool = True) -> Optional[float]:
+        """
+        Calculate a timeout from a deadline.
+
+        Args:
+            raise_if_elapsed (bool): Whether to raise :exc:`TimeoutError`
+                if the deadline lapsed.
+
+        Raises:
+            TimeoutError: If the deadline lapsed.
+
+        Returns:
+            Time left in seconds or :obj:`None` if there is no limit.
+
+        """
+        if self.deadline is None:
+            return None
+        timeout = self.deadline - time.monotonic()
+        if raise_if_elapsed and timeout <= 0:
+            raise TimeoutError("timed out")
+        return timeout

code/.venv/lib/python3.12/site-packages/websockets/typing.py

@@ -0,0 +1,67 @@
+from __future__ import annotations
+
+import http
+import logging
+from typing import List, NewType, Optional, Tuple, Union
+
+
+__all__ = [
+    "Data",
+    "LoggerLike",
+    "StatusLike",
+    "Origin",
+    "Subprotocol",
+    "ExtensionName",
+    "ExtensionParameter",
+]
+
+
+# Public types used in the signature of public APIs
+
+Data = Union[str, bytes]
+"""Types supported in a WebSocket message:
+:class:`str` for a Text_ frame, :class:`bytes` for a Binary_.
+
+.. _Text: https://www.rfc-editor.org/rfc/rfc6455.html#section-5.6
+.. _Binary : https://www.rfc-editor.org/rfc/rfc6455.html#section-5.6
+
+"""
+
+
+LoggerLike = Union[logging.Logger, logging.LoggerAdapter]
+"""Types accepted where a :class:`~logging.Logger` is expected."""
+
+
+StatusLike = Union[http.HTTPStatus, int]
+"""
+Types accepted where an :class:`~http.HTTPStatus` is expected."""
+
+
+Origin = NewType("Origin", str)
+"""Value of a ``Origin`` header."""
+
+
+Subprotocol = NewType("Subprotocol", str)
+"""Subprotocol in a ``Sec-WebSocket-Protocol`` header."""
+
+
+ExtensionName = NewType("ExtensionName", str)
+"""Name of a WebSocket extension."""
+
+
+ExtensionParameter = Tuple[str, Optional[str]]
+"""Parameter of a WebSocket extension."""
+
+
+# Private types
+
+ExtensionHeader = Tuple[ExtensionName, List[ExtensionParameter]]
+"""Extension in a ``Sec-WebSocket-Extensions`` header."""
+
+
+ConnectionOption = NewType("ConnectionOption", str)
+"""Connection option in a ``Connection`` header."""
+
+
+UpgradeProtocol = NewType("UpgradeProtocol", str)
+"""Upgrade protocol in an ``Upgrade`` header."""

code/.venv/lib/python3.12/site-packages/websockets/uri.py

@@ -0,0 +1,108 @@
+from __future__ import annotations
+
+import dataclasses
+import urllib.parse
+from typing import Optional, Tuple
+
+from . import exceptions
+
+
+__all__ = ["parse_uri", "WebSocketURI"]
+
+
+@dataclasses.dataclass
+class WebSocketURI:
+    """
+    WebSocket URI.
+
+    Attributes:
+        secure: :obj:`True` for a ``wss`` URI, :obj:`False` for a ``ws`` URI.
+        host: Normalized to lower case.
+        port: Always set even if it's the default.
+        path: May be empty.
+        query: May be empty if the URI doesn't include a query component.
+        username: Available when the URI contains `User Information`_.
+        password: Available when the URI contains `User Information`_.
+
+    .. _User Information: https://www.rfc-editor.org/rfc/rfc3986.html#section-3.2.1
+
+    """
+
+    secure: bool
+    host: str
+    port: int
+    path: str
+    query: str
+    username: Optional[str] = None
+    password: Optional[str] = None
+
+    @property
+    def resource_name(self) -> str:
+        if self.path:
+            resource_name = self.path
+        else:
+            resource_name = "/"
+        if self.query:
+            resource_name += "?" + self.query
+        return resource_name
+
+    @property
+    def user_info(self) -> Optional[Tuple[str, str]]:
+        if self.username is None:
+            return None
+        assert self.password is not None
+        return (self.username, self.password)
+
+
+# All characters from the gen-delims and sub-delims sets in RFC 3987.
+DELIMS = ":/?#[]@!$&'()*+,;="
+
+
+def parse_uri(uri: str) -> WebSocketURI:
+    """
+    Parse and validate a WebSocket URI.
+
+    Args:
+        uri: WebSocket URI.
+
+    Returns:
+        WebSocketURI: Parsed WebSocket URI.
+
+    Raises:
+        InvalidURI: if ``uri`` isn't a valid WebSocket URI.
+
+    """
+    parsed = urllib.parse.urlparse(uri)
+    if parsed.scheme not in ["ws", "wss"]:
+        raise exceptions.InvalidURI(uri, "scheme isn't ws or wss")
+    if parsed.hostname is None:
+        raise exceptions.InvalidURI(uri, "hostname isn't provided")
+    if parsed.fragment != "":
+        raise exceptions.InvalidURI(uri, "fragment identifier is meaningless")
+
+    secure = parsed.scheme == "wss"
+    host = parsed.hostname
+    port = parsed.port or (443 if secure else 80)
+    path = parsed.path
+    query = parsed.query
+    username = parsed.username
+    password = parsed.password
+    # urllib.parse.urlparse accepts URLs with a username but without a
+    # password. This doesn't make sense for HTTP Basic Auth credentials.
+    if username is not None and password is None:
+        raise exceptions.InvalidURI(uri, "username provided without password")
+
+    try:
+        uri.encode("ascii")
+    except UnicodeEncodeError:
+        # Input contains non-ASCII characters.
+        # It must be an IRI. Convert it to a URI.
+        host = host.encode("idna").decode()
+        path = urllib.parse.quote(path, safe=DELIMS)
+        query = urllib.parse.quote(query, safe=DELIMS)
+        if username is not None:
+            assert password is not None
+            username = urllib.parse.quote(username, safe=DELIMS)
+            password = urllib.parse.quote(password, safe=DELIMS)
+
+    return WebSocketURI(secure, host, port, path, query, username, password)

code/.venv/lib/python3.12/site-packages/websockets/utils.py

@@ -0,0 +1,51 @@
+from __future__ import annotations
+
+import base64
+import hashlib
+import secrets
+import sys
+
+
+__all__ = ["accept_key", "apply_mask"]
+
+
+GUID = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"
+
+
+def generate_key() -> str:
+    """
+    Generate a random key for the Sec-WebSocket-Key header.
+
+    """
+    key = secrets.token_bytes(16)
+    return base64.b64encode(key).decode()
+
+
+def accept_key(key: str) -> str:
+    """
+    Compute the value of the Sec-WebSocket-Accept header.
+
+    Args:
+        key: value of the Sec-WebSocket-Key header.
+
+    """
+    sha1 = hashlib.sha1((key + GUID).encode()).digest()
+    return base64.b64encode(sha1).decode()
+
+
+def apply_mask(data: bytes, mask: bytes) -> bytes:
+    """
+    Apply masking to the data of a WebSocket message.
+
+    Args:
+        data: data to mask.
+        mask: 4-bytes mask.
+
+    """
+    if len(mask) != 4:
+        raise ValueError("mask must contain 4 bytes")
+
+    data_int = int.from_bytes(data, sys.byteorder)
+    mask_repeated = mask * (len(data) // 4) + mask[: len(data) % 4]
+    mask_int = int.from_bytes(mask_repeated, sys.byteorder)
+    return (data_int ^ mask_int).to_bytes(len(data), sys.byteorder)

code/.venv/lib/python3.12/site-packages/websockets/version.py

@@ -0,0 +1,82 @@
+from __future__ import annotations
+
+import importlib.metadata
+
+
+__all__ = ["tag", "version", "commit"]
+
+
+# ========= =========== ===================
+#           release     development
+# ========= =========== ===================
+# tag       X.Y         X.Y (upcoming)
+# version   X.Y         X.Y.dev1+g5678cde
+# commit    X.Y         5678cde
+# ========= =========== ===================
+
+
+# When tagging a release, set `released = True`.
+# After tagging a release, set `released = False` and increment `tag`.
+
+released = True
+
+tag = version = commit = "12.0"
+
+
+if not released:  # pragma: no cover
+    import pathlib
+    import re
+    import subprocess
+
+    def get_version(tag: str) -> str:
+        # Since setup.py executes the contents of src/websockets/version.py,
+        # __file__ can point to either of these two files.
+        file_path = pathlib.Path(__file__)
+        root_dir = file_path.parents[0 if file_path.name == "setup.py" else 2]
+
+        # Read version from git if available. This prevents reading stale
+        # information from src/websockets.egg-info after building a sdist.
+        try:
+            description = subprocess.run(
+                ["git", "describe", "--dirty", "--tags", "--long"],
+                capture_output=True,
+                cwd=root_dir,
+                timeout=1,
+                check=True,
+                text=True,
+            ).stdout.strip()
+        # subprocess.run raises FileNotFoundError if git isn't on $PATH.
+        except (
+            FileNotFoundError,
+            subprocess.CalledProcessError,
+            subprocess.TimeoutExpired,
+        ):
+            pass
+        else:
+            description_re = r"[0-9.]+-([0-9]+)-(g[0-9a-f]{7,}(?:-dirty)?)"
+            match = re.fullmatch(description_re, description)
+            assert match is not None
+            distance, remainder = match.groups()
+            remainder = remainder.replace("-", ".")  # required by PEP 440
+            return f"{tag}.dev{distance}+{remainder}"
+
+        # Read version from package metadata if it is installed.
+        try:
+            return importlib.metadata.version("websockets")
+        except ImportError:
+            pass
+
+        # Avoid crashing if the development version cannot be determined.
+        return f"{tag}.dev0+gunknown"
+
+    version = get_version(tag)
+
+    def get_commit(tag: str, version: str) -> str:
+        # Extract commit from version, falling back to tag if not available.
+        version_re = r"[0-9.]+\.dev[0-9]+\+g([0-9a-f]{7,}|unknown)(?:\.dirty)?"
+        match = re.fullmatch(version_re, version)
+        assert match is not None
+        (commit,) = match.groups()
+        return tag if commit == "unknown" else commit
+
+    commit = get_commit(tag, version)