two version of R2R are here HEAD master

1 files changed, 747 insertions, 0 deletions

diff --git a/.venv/lib/python3.12/site-packages/websockets/sync/server.py b/.venv/lib/python3.12/site-packages/websockets/sync/server.py
new file mode 100644
index 00000000..50a2f3c0
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+++ b/.venv/lib/python3.12/site-packages/websockets/sync/server.py
@@ -0,0 +1,747 @@
+from __future__ import annotations
+
+import hmac
+import http
+import logging
+import os
+import re
+import selectors
+import socket
+import ssl as ssl_module
+import sys
+import threading
+import warnings
+from collections.abc import Iterable, Sequence
+from types import TracebackType
+from typing import Any, Callable, cast
+
+from ..exceptions import InvalidHeader
+from ..extensions.base import ServerExtensionFactory
+from ..extensions.permessage_deflate import enable_server_permessage_deflate
+from ..frames import CloseCode
+from ..headers import (
+    build_www_authenticate_basic,
+    parse_authorization_basic,
+    validate_subprotocols,
+)
+from ..http11 import SERVER, Request, Response
+from ..protocol import CONNECTING, OPEN, Event
+from ..server import ServerProtocol
+from ..typing import LoggerLike, Origin, StatusLike, Subprotocol
+from .connection import Connection
+from .utils import Deadline
+
+
+__all__ = ["serve", "unix_serve", "ServerConnection", "Server", "basic_auth"]
+
+
+class ServerConnection(Connection):
+    """
+    :mod:`threading` 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.
+
+    The ``close_timeout`` and ``max_queue`` arguments have the same meaning as
+    in :func:`serve`.
+
+    Args:
+        socket: Socket connected to a WebSocket client.
+        protocol: Sans-I/O connection.
+
+    """
+
+    def __init__(
+        self,
+        socket: socket.socket,
+        protocol: ServerProtocol,
+        *,
+        close_timeout: float | None = 10,
+        max_queue: int | None | tuple[int | None, int | None] = 16,
+    ) -> None:
+        self.protocol: ServerProtocol
+        self.request_rcvd = threading.Event()
+        super().__init__(
+            socket,
+            protocol,
+            close_timeout=close_timeout,
+            max_queue=max_queue,
+        )
+        self.username: str  # see basic_auth()
+
+    def respond(self, status: StatusLike, text: str) -> Response:
+        """
+        Create a plain text HTTP response.
+
+        ``process_request`` and ``process_response`` may call this method to
+        return an HTTP response instead of performing the WebSocket opening
+        handshake.
+
+        You can modify the response before returning it, for example by changing
+        HTTP headers.
+
+        Args:
+            status: HTTP status code.
+            text: HTTP response body; it will be encoded to UTF-8.
+
+        Returns:
+            HTTP response to send to the client.
+
+        """
+        return self.protocol.reject(status, text)
+
+    def handshake(
+        self,
+        process_request: (
+            Callable[
+                [ServerConnection, Request],
+                Response | None,
+            ]
+            | None
+        ) = None,
+        process_response: (
+            Callable[
+                [ServerConnection, Request, Response],
+                Response | None,
+            ]
+            | None
+        ) = None,
+        server_header: str | None = SERVER,
+        timeout: float | None = None,
+    ) -> None:
+        """
+        Perform the opening handshake.
+
+        """
+        if not self.request_rcvd.wait(timeout):
+            raise TimeoutError("timed out during handshake")
+
+        if self.request is not None:
+            with self.send_context(expected_state=CONNECTING):
+                response = None
+
+                if process_request is not None:
+                    try:
+                        response = process_request(self, self.request)
+                    except Exception as exc:
+                        self.protocol.handshake_exc = exc
+                        response = self.protocol.reject(
+                            http.HTTPStatus.INTERNAL_SERVER_ERROR,
+                            (
+                                "Failed to open a WebSocket connection.\n"
+                                "See server log for more information.\n"
+                            ),
+                        )
+
+                if response is None:
+                    self.response = self.protocol.accept(self.request)
+                else:
+                    self.response = response
+
+                if server_header:
+                    self.response.headers["Server"] = server_header
+
+                response = None
+
+                if process_response is not None:
+                    try:
+                        response = process_response(self, self.request, self.response)
+                    except Exception as exc:
+                        self.protocol.handshake_exc = exc
+                        response = self.protocol.reject(
+                            http.HTTPStatus.INTERNAL_SERVER_ERROR,
+                            (
+                                "Failed to open a WebSocket connection.\n"
+                                "See server log for more information.\n"
+                            ),
+                        )
+
+                    if response is not None:
+                        self.response = response
+
+                self.protocol.send_response(self.response)
+
+        # self.protocol.handshake_exc is set when the connection is lost before
+        # receiving a request, when the request cannot be parsed, or when the
+        # handshake fails, including when process_request or process_response
+        # raises an exception.
+
+        # It isn't set when process_request or process_response sends an HTTP
+        # response that rejects the handshake.
+
+        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 Server:
+    """
+    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.
+            It defaults to ``logging.getLogger("websockets.server")``.
+            See the :doc:`logging guide <../../topics/logging>` for details.
+
+    """
+
+    def __init__(
+        self,
+        socket: socket.socket,
+        handler: Callable[[socket.socket, Any], None],
+        logger: LoggerLike | None = None,
+    ) -> 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()
+        try:
+            poller.register(self.socket, selectors.EVENT_READ)
+        except ValueError:  # pragma: no cover
+            # If shutdown() is called before poller.register(),
+            # the socket is closed and poller.register() raises
+            # ValueError: Invalid file descriptor: -1
+            return
+        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
+            # Since there isn't a mechanism for tracking connections and waiting
+            # for them to terminate, we cannot use daemon threads, or else all
+            # connections would be terminate brutally when closing the server.
+            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) -> Server:
+        return self
+
+    def __exit__(
+        self,
+        exc_type: type[BaseException] | None,
+        exc_value: BaseException | None,
+        traceback: TracebackType | None,
+    ) -> None:
+        self.shutdown()
+
+
+def __getattr__(name: str) -> Any:
+    if name == "WebSocketServer":
+        warnings.warn(  # deprecated in 13.0 - 2024-08-20
+            "WebSocketServer was renamed to Server",
+            DeprecationWarning,
+        )
+        return Server
+    raise AttributeError(f"module {__name__!r} has no attribute {name!r}")
+
+
+def serve(
+    handler: Callable[[ServerConnection], None],
+    host: str | None = None,
+    port: int | None = None,
+    *,
+    # TCP/TLS
+    sock: socket.socket | None = None,
+    ssl: ssl_module.SSLContext | None = None,
+    # WebSocket
+    origins: Sequence[Origin | re.Pattern[str] | None] | None = None,
+    extensions: Sequence[ServerExtensionFactory] | None = None,
+    subprotocols: Sequence[Subprotocol] | None = None,
+    select_subprotocol: (
+        Callable[
+            [ServerConnection, Sequence[Subprotocol]],
+            Subprotocol | None,
+        ]
+        | None
+    ) = None,
+    process_request: (
+        Callable[
+            [ServerConnection, Request],
+            Response | None,
+        ]
+        | None
+    ) = None,
+    process_response: (
+        Callable[
+            [ServerConnection, Request, Response],
+            Response | None,
+        ]
+        | None
+    ) = None,
+    server_header: str | None = SERVER,
+    compression: str | None = "deflate",
+    # Timeouts
+    open_timeout: float | None = 10,
+    close_timeout: float | None = 10,
+    # Limits
+    max_size: int | None = 2**20,
+    max_queue: int | None | tuple[int | None, int | None] = 16,
+    # Logging
+    logger: LoggerLike | None = None,
+    # Escape hatch for advanced customization
+    create_connection: type[ServerConnection] | None = None,
+    **kwargs: Any,
+) -> Server:
+    """
+    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 the :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.
+
+    This function returns a :class:`Server` whose API mirrors
+    :class:`~socketserver.BaseServer`. Treat it as a context manager to ensure
+    that it will be closed and call :meth:`~Server.serve_forever` to serve
+    requests::
+
+        from websockets.sync.server import serve
+
+        def handler(websocket):
+            ...
+
+        with 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: Configuration for enabling TLS on the connection.
+        origins: Acceptable values of the ``Origin`` header, for defending
+            against Cross-Site WebSocket Hijacking attacks. Values can be
+            :class:`str` to test for an exact match or regular expressions
+            compiled by :func:`re.compile` to test against a pattern. 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. Return :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.
+            Modify the response or return a new HTTP response to force the
+            response. Return :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.
+        max_queue: High-water mark of the buffer where frames are received.
+            It defaults to 16 frames. The low-water mark defaults to ``max_queue
+            // 4``. You may pass a ``(high, low)`` tuple to set the high-water
+            and low-water marks. If you want to disable flow control entirely,
+            you may set it to ``None``, although that's a bad idea.
+        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.
+
+    Any other keyword arguments are passed to :func:`~socket.create_server`.
+
+    """
+
+    # Process parameters
+
+    # Backwards compatibility: ssl used to be called ssl_context.
+    if ssl is None and "ssl_context" in kwargs:
+        ssl = kwargs.pop("ssl_context")
+        warnings.warn(  # deprecated in 13.0 - 2024-08-20
+            "ssl_context was renamed to ssl",
+            DeprecationWarning,
+        )
+
+    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
+
+    # Private APIs for unix_connect()
+    unix: bool = kwargs.pop("unix", False)
+    path: str | None = kwargs.pop("path", None)
+
+    if sock is None:
+        if unix:
+            if path is None:
+                raise ValueError("missing path argument")
+            kwargs.setdefault("family", socket.AF_UNIX)
+            sock = socket.create_server(path, **kwargs)
+        else:
+            sock = socket.create_server((host, port), **kwargs)
+    else:
+        if path is not None:
+            raise ValueError("path and sock arguments are incompatible")
+
+    # Initialize TLS wrapper
+
+    if ssl is not None:
+        sock = ssl.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 is not None:
+                sock.settimeout(deadline.timeout())
+                # mypy cannot figure this out
+                assert isinstance(sock, ssl_module.SSLSocket)
+                sock.do_handshake()
+                sock.settimeout(None)
+
+            # Create a closure to give select_subprotocol access to connection.
+            protocol_select_subprotocol: (
+                Callable[
+                    [ServerProtocol, Sequence[Subprotocol]],
+                    Subprotocol | None,
+                ]
+                | None
+            ) = None
+            if select_subprotocol is not None:
+
+                def protocol_select_subprotocol(
+                    protocol: ServerProtocol,
+                    subprotocols: Sequence[Subprotocol],
+                ) -> Subprotocol | None:
+                    # 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 protocol
+
+            protocol = ServerProtocol(
+                origins=origins,
+                extensions=extensions,
+                subprotocols=subprotocols,
+                select_subprotocol=protocol_select_subprotocol,
+                max_size=max_size,
+                logger=logger,
+            )
+
+            # Initialize WebSocket connection
+
+            assert create_connection is not None  # help mypy
+            connection = create_connection(
+                sock,
+                protocol,
+                close_timeout=close_timeout,
+                max_queue=max_queue,
+            )
+        except Exception:
+            sock.close()
+            return
+
+        try:
+            try:
+                connection.handshake(
+                    process_request,
+                    process_response,
+                    server_header,
+                    deadline.timeout(),
+                )
+            except TimeoutError:
+                connection.close_socket()
+                connection.recv_events_thread.join()
+                return
+            except Exception:
+                connection.logger.error("opening handshake failed", exc_info=True)
+                connection.close_socket()
+                connection.recv_events_thread.join()
+                return
+
+            assert connection.protocol.state is OPEN
+            try:
+                handler(connection)
+            except Exception:
+                connection.logger.error("connection handler failed", exc_info=True)
+                connection.close(CloseCode.INTERNAL_ERROR)
+            else:
+                connection.close()
+
+        except Exception:  # pragma: no cover
+            # Don't leak sockets on unexpected errors.
+            sock.close()
+
+    # Initialize server
+
+    return Server(sock, conn_handler, logger)
+
+
+def unix_serve(
+    handler: Callable[[ServerConnection], None],
+    path: str | None = None,
+    **kwargs: Any,
+) -> Server:
+    """
+    Create a WebSocket server listening on a Unix socket.
+
+    This function accepts the same keyword arguments as :func:`serve`.
+
+    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, unix=True, path=path, **kwargs)
+
+
+def is_credentials(credentials: Any) -> bool:
+    try:
+        username, password = credentials
+    except (TypeError, ValueError):
+        return False
+    else:
+        return isinstance(username, str) and isinstance(password, str)
+
+
+def basic_auth(
+    realm: str = "",
+    credentials: tuple[str, str] | Iterable[tuple[str, str]] | None = None,
+    check_credentials: Callable[[str, str], bool] | None = None,
+) -> Callable[[ServerConnection, Request], Response | None]:
+    """
+    Factory for ``process_request`` to enforce HTTP Basic Authentication.
+
+    :func:`basic_auth` is designed to integrate with :func:`serve` as follows::
+
+        from websockets.sync.server import basic_auth, serve
+
+        with serve(
+            ...,
+            process_request=basic_auth(
+                realm="my dev server",
+                credentials=("hello", "iloveyou"),
+            ),
+        ):
+
+    If authentication succeeds, the connection's ``username`` attribute is set.
+    If it fails, the server responds with an HTTP 401 Unauthorized status.
+
+    One of ``credentials`` or ``check_credentials`` must be provided; not both.
+
+    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: Function that verifies credentials.
+            It receives ``username`` and ``password`` arguments and returns
+            whether they're valid.
+    Raises:
+        TypeError: If ``credentials`` or ``check_credentials`` is wrong.
+        ValueError: If ``credentials`` and ``check_credentials`` are both
+            provided or both not provided.
+
+    """
+    if (credentials is None) == (check_credentials is None):
+        raise ValueError("provide either credentials or check_credentials")
+
+    if credentials is not None:
+        if is_credentials(credentials):
+            credentials_list = [cast(tuple[str, str], credentials)]
+        elif isinstance(credentials, Iterable):
+            credentials_list = list(cast(Iterable[tuple[str, str]], 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)
+
+        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)
+
+    assert check_credentials is not None  # help mypy
+
+    def process_request(
+        connection: ServerConnection,
+        request: Request,
+    ) -> Response | None:
+        """
+        Perform HTTP Basic Authentication.
+
+        If it succeeds, set the connection's ``username`` attribute and return
+        :obj:`None`. If it fails, return an HTTP 401 Unauthorized responss.
+
+        """
+        try:
+            authorization = request.headers["Authorization"]
+        except KeyError:
+            response = connection.respond(
+                http.HTTPStatus.UNAUTHORIZED,
+                "Missing credentials\n",
+            )
+            response.headers["WWW-Authenticate"] = build_www_authenticate_basic(realm)
+            return response
+
+        try:
+            username, password = parse_authorization_basic(authorization)
+        except InvalidHeader:
+            response = connection.respond(
+                http.HTTPStatus.UNAUTHORIZED,
+                "Unsupported credentials\n",
+            )
+            response.headers["WWW-Authenticate"] = build_www_authenticate_basic(realm)
+            return response
+
+        if not check_credentials(username, password):
+            response = connection.respond(
+                http.HTTPStatus.UNAUTHORIZED,
+                "Invalid credentials\n",
+            )
+            response.headers["WWW-Authenticate"] = build_www_authenticate_basic(realm)
+            return response
+
+        connection.username = username
+        return None
+
+    return process_request