bbf6d9b026
Bugfix for feeds
- removed categories related and up
- load new books now working
- category random now working
login page is free of non accessible elements
boolean custom column is vivible in UI
books with only with certain languages can be shown
book shelfs can be deleted from UI
Anonymous user view is more resticted
Added browse of series in sidebar
Dependencys in vendor folder are updated to newer versions (licencs files are now present)
Bugfix editing Authors names
Made upload on windows working
1041 lines
39 KiB
Python
1041 lines
39 KiB
Python
"""Implementation of the WebSocket protocol.
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`WebSockets <http://dev.w3.org/html5/websockets/>`_ allow for bidirectional
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communication between the browser and server.
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WebSockets are supported in the current versions of all major browsers,
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although older versions that do not support WebSockets are still in use
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(refer to http://caniuse.com/websockets for details).
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This module implements the final version of the WebSocket protocol as
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defined in `RFC 6455 <http://tools.ietf.org/html/rfc6455>`_. Certain
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browser versions (notably Safari 5.x) implemented an earlier draft of
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the protocol (known as "draft 76") and are not compatible with this module.
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.. versionchanged:: 4.0
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Removed support for the draft 76 protocol version.
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"""
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from __future__ import absolute_import, division, print_function, with_statement
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# Author: Jacob Kristhammar, 2010
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import base64
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import collections
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import hashlib
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import os
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import struct
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import tornado.escape
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import tornado.web
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import zlib
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from tornado.concurrent import TracebackFuture
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from tornado.escape import utf8, native_str, to_unicode
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from tornado import httpclient, httputil
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from tornado.ioloop import IOLoop
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from tornado.iostream import StreamClosedError
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from tornado.log import gen_log, app_log
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from tornado import simple_httpclient
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from tornado.tcpclient import TCPClient
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from tornado.util import _websocket_mask
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try:
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from urllib.parse import urlparse # py2
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except ImportError:
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from urlparse import urlparse # py3
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try:
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xrange # py2
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except NameError:
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xrange = range # py3
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class WebSocketError(Exception):
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pass
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class WebSocketClosedError(WebSocketError):
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"""Raised by operations on a closed connection.
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.. versionadded:: 3.2
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"""
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pass
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class WebSocketHandler(tornado.web.RequestHandler):
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"""Subclass this class to create a basic WebSocket handler.
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Override `on_message` to handle incoming messages, and use
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`write_message` to send messages to the client. You can also
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override `open` and `on_close` to handle opened and closed
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connections.
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See http://dev.w3.org/html5/websockets/ for details on the
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JavaScript interface. The protocol is specified at
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http://tools.ietf.org/html/rfc6455.
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Here is an example WebSocket handler that echos back all received messages
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back to the client::
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class EchoWebSocket(websocket.WebSocketHandler):
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def open(self):
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print "WebSocket opened"
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def on_message(self, message):
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self.write_message(u"You said: " + message)
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def on_close(self):
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print "WebSocket closed"
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WebSockets are not standard HTTP connections. The "handshake" is
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HTTP, but after the handshake, the protocol is
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message-based. Consequently, most of the Tornado HTTP facilities
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are not available in handlers of this type. The only communication
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methods available to you are `write_message()`, `ping()`, and
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`close()`. Likewise, your request handler class should implement
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`open()` method rather than ``get()`` or ``post()``.
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If you map the handler above to ``/websocket`` in your application, you can
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invoke it in JavaScript with::
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var ws = new WebSocket("ws://localhost:8888/websocket");
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ws.onopen = function() {
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ws.send("Hello, world");
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};
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ws.onmessage = function (evt) {
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alert(evt.data);
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};
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This script pops up an alert box that says "You said: Hello, world".
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Web browsers allow any site to open a websocket connection to any other,
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instead of using the same-origin policy that governs other network
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access from javascript. This can be surprising and is a potential
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security hole, so since Tornado 4.0 `WebSocketHandler` requires
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applications that wish to receive cross-origin websockets to opt in
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by overriding the `~WebSocketHandler.check_origin` method (see that
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method's docs for details). Failure to do so is the most likely
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cause of 403 errors when making a websocket connection.
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When using a secure websocket connection (``wss://``) with a self-signed
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certificate, the connection from a browser may fail because it wants
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to show the "accept this certificate" dialog but has nowhere to show it.
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You must first visit a regular HTML page using the same certificate
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to accept it before the websocket connection will succeed.
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"""
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def __init__(self, application, request, **kwargs):
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tornado.web.RequestHandler.__init__(self, application, request,
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**kwargs)
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self.ws_connection = None
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self.close_code = None
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self.close_reason = None
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self.stream = None
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self._on_close_called = False
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@tornado.web.asynchronous
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def get(self, *args, **kwargs):
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self.open_args = args
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self.open_kwargs = kwargs
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# Upgrade header should be present and should be equal to WebSocket
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if self.request.headers.get("Upgrade", "").lower() != 'websocket':
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self.set_status(400)
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self.finish("Can \"Upgrade\" only to \"WebSocket\".")
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return
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# Connection header should be upgrade. Some proxy servers/load balancers
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# might mess with it.
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headers = self.request.headers
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connection = map(lambda s: s.strip().lower(), headers.get("Connection", "").split(","))
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if 'upgrade' not in connection:
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self.set_status(400)
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self.finish("\"Connection\" must be \"Upgrade\".")
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return
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# Handle WebSocket Origin naming convention differences
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# The difference between version 8 and 13 is that in 8 the
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# client sends a "Sec-Websocket-Origin" header and in 13 it's
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# simply "Origin".
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if "Origin" in self.request.headers:
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origin = self.request.headers.get("Origin")
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else:
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origin = self.request.headers.get("Sec-Websocket-Origin", None)
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# If there was an origin header, check to make sure it matches
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# according to check_origin. When the origin is None, we assume it
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# did not come from a browser and that it can be passed on.
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if origin is not None and not self.check_origin(origin):
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self.set_status(403)
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self.finish("Cross origin websockets not allowed")
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return
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self.stream = self.request.connection.detach()
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self.stream.set_close_callback(self.on_connection_close)
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self.ws_connection = self.get_websocket_protocol()
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if self.ws_connection:
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self.ws_connection.accept_connection()
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else:
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if not self.stream.closed():
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self.stream.write(tornado.escape.utf8(
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"HTTP/1.1 426 Upgrade Required\r\n"
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"Sec-WebSocket-Version: 7, 8, 13\r\n\r\n"))
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self.stream.close()
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def write_message(self, message, binary=False):
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"""Sends the given message to the client of this Web Socket.
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The message may be either a string or a dict (which will be
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encoded as json). If the ``binary`` argument is false, the
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message will be sent as utf8; in binary mode any byte string
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is allowed.
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If the connection is already closed, raises `WebSocketClosedError`.
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.. versionchanged:: 3.2
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`WebSocketClosedError` was added (previously a closed connection
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would raise an `AttributeError`)
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"""
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if self.ws_connection is None:
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raise WebSocketClosedError()
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if isinstance(message, dict):
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message = tornado.escape.json_encode(message)
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self.ws_connection.write_message(message, binary=binary)
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def select_subprotocol(self, subprotocols):
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"""Invoked when a new WebSocket requests specific subprotocols.
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``subprotocols`` is a list of strings identifying the
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subprotocols proposed by the client. This method may be
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overridden to return one of those strings to select it, or
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``None`` to not select a subprotocol. Failure to select a
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subprotocol does not automatically abort the connection,
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although clients may close the connection if none of their
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proposed subprotocols was selected.
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"""
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return None
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def get_compression_options(self):
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"""Override to return compression options for the connection.
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If this method returns None (the default), compression will
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be disabled. If it returns a dict (even an empty one), it
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will be enabled. The contents of the dict may be used to
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control the memory and CPU usage of the compression,
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but no such options are currently implemented.
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.. versionadded:: 4.1
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"""
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return None
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def open(self, *args, **kwargs):
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"""Invoked when a new WebSocket is opened.
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The arguments to `open` are extracted from the `tornado.web.URLSpec`
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regular expression, just like the arguments to
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`tornado.web.RequestHandler.get`.
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"""
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pass
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def on_message(self, message):
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"""Handle incoming messages on the WebSocket
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This method must be overridden.
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"""
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raise NotImplementedError
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def ping(self, data):
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"""Send ping frame to the remote end."""
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if self.ws_connection is None:
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raise WebSocketClosedError()
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self.ws_connection.write_ping(data)
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def on_pong(self, data):
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"""Invoked when the response to a ping frame is received."""
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pass
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def on_close(self):
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"""Invoked when the WebSocket is closed.
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If the connection was closed cleanly and a status code or reason
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phrase was supplied, these values will be available as the attributes
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``self.close_code`` and ``self.close_reason``.
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.. versionchanged:: 4.0
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Added ``close_code`` and ``close_reason`` attributes.
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"""
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pass
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def close(self, code=None, reason=None):
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"""Closes this Web Socket.
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Once the close handshake is successful the socket will be closed.
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``code`` may be a numeric status code, taken from the values
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defined in `RFC 6455 section 7.4.1
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<https://tools.ietf.org/html/rfc6455#section-7.4.1>`_.
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``reason`` may be a textual message about why the connection is
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closing. These values are made available to the client, but are
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not otherwise interpreted by the websocket protocol.
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.. versionchanged:: 4.0
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Added the ``code`` and ``reason`` arguments.
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"""
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if self.ws_connection:
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self.ws_connection.close(code, reason)
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self.ws_connection = None
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def check_origin(self, origin):
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"""Override to enable support for allowing alternate origins.
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The ``origin`` argument is the value of the ``Origin`` HTTP
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header, the url responsible for initiating this request. This
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method is not called for clients that do not send this header;
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such requests are always allowed (because all browsers that
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implement WebSockets support this header, and non-browser
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clients do not have the same cross-site security concerns).
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Should return True to accept the request or False to reject it.
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By default, rejects all requests with an origin on a host other
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than this one.
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This is a security protection against cross site scripting attacks on
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browsers, since WebSockets are allowed to bypass the usual same-origin
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policies and don't use CORS headers.
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To accept all cross-origin traffic (which was the default prior to
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Tornado 4.0), simply override this method to always return true::
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def check_origin(self, origin):
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return True
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To allow connections from any subdomain of your site, you might
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do something like::
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def check_origin(self, origin):
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parsed_origin = urllib.parse.urlparse(origin)
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return parsed_origin.netloc.endswith(".mydomain.com")
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.. versionadded:: 4.0
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"""
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parsed_origin = urlparse(origin)
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origin = parsed_origin.netloc
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origin = origin.lower()
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host = self.request.headers.get("Host")
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# Check to see that origin matches host directly, including ports
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return origin == host
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def set_nodelay(self, value):
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"""Set the no-delay flag for this stream.
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By default, small messages may be delayed and/or combined to minimize
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the number of packets sent. This can sometimes cause 200-500ms delays
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due to the interaction between Nagle's algorithm and TCP delayed
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ACKs. To reduce this delay (at the expense of possibly increasing
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bandwidth usage), call ``self.set_nodelay(True)`` once the websocket
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connection is established.
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See `.BaseIOStream.set_nodelay` for additional details.
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.. versionadded:: 3.1
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"""
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self.stream.set_nodelay(value)
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def on_connection_close(self):
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if self.ws_connection:
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self.ws_connection.on_connection_close()
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self.ws_connection = None
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if not self._on_close_called:
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self._on_close_called
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self.on_close()
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def send_error(self, *args, **kwargs):
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if self.stream is None:
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super(WebSocketHandler, self).send_error(*args, **kwargs)
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else:
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# If we get an uncaught exception during the handshake,
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# we have no choice but to abruptly close the connection.
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# TODO: for uncaught exceptions after the handshake,
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# we can close the connection more gracefully.
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self.stream.close()
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def get_websocket_protocol(self):
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websocket_version = self.request.headers.get("Sec-WebSocket-Version")
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if websocket_version in ("7", "8", "13"):
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return WebSocketProtocol13(
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self, compression_options=self.get_compression_options())
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def _wrap_method(method):
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def _disallow_for_websocket(self, *args, **kwargs):
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if self.stream is None:
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method(self, *args, **kwargs)
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else:
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raise RuntimeError("Method not supported for Web Sockets")
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return _disallow_for_websocket
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for method in ["write", "redirect", "set_header", "set_cookie",
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"set_status", "flush", "finish"]:
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setattr(WebSocketHandler, method,
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_wrap_method(getattr(WebSocketHandler, method)))
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class WebSocketProtocol(object):
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"""Base class for WebSocket protocol versions.
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"""
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def __init__(self, handler):
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self.handler = handler
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self.request = handler.request
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self.stream = handler.stream
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self.client_terminated = False
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self.server_terminated = False
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def _run_callback(self, callback, *args, **kwargs):
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"""Runs the given callback with exception handling.
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On error, aborts the websocket connection and returns False.
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"""
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try:
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callback(*args, **kwargs)
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except Exception:
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app_log.error("Uncaught exception in %s",
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self.request.path, exc_info=True)
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self._abort()
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def on_connection_close(self):
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self._abort()
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def _abort(self):
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"""Instantly aborts the WebSocket connection by closing the socket"""
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self.client_terminated = True
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self.server_terminated = True
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self.stream.close() # forcibly tear down the connection
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self.close() # let the subclass cleanup
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|
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class _PerMessageDeflateCompressor(object):
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def __init__(self, persistent, max_wbits):
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if max_wbits is None:
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max_wbits = zlib.MAX_WBITS
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# There is no symbolic constant for the minimum wbits value.
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if not (8 <= max_wbits <= zlib.MAX_WBITS):
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raise ValueError("Invalid max_wbits value %r; allowed range 8-%d",
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max_wbits, zlib.MAX_WBITS)
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self._max_wbits = max_wbits
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if persistent:
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self._compressor = self._create_compressor()
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else:
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self._compressor = None
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|
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def _create_compressor(self):
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return zlib.compressobj(-1, zlib.DEFLATED, -self._max_wbits)
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|
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def compress(self, data):
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compressor = self._compressor or self._create_compressor()
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data = (compressor.compress(data) +
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compressor.flush(zlib.Z_SYNC_FLUSH))
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assert data.endswith(b'\x00\x00\xff\xff')
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return data[:-4]
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|
|
|
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class _PerMessageDeflateDecompressor(object):
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def __init__(self, persistent, max_wbits):
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if max_wbits is None:
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max_wbits = zlib.MAX_WBITS
|
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if not (8 <= max_wbits <= zlib.MAX_WBITS):
|
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raise ValueError("Invalid max_wbits value %r; allowed range 8-%d",
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max_wbits, zlib.MAX_WBITS)
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self._max_wbits = max_wbits
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if persistent:
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self._decompressor = self._create_decompressor()
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else:
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self._decompressor = None
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|
|
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def _create_decompressor(self):
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return zlib.decompressobj(-self._max_wbits)
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|
|
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def decompress(self, data):
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decompressor = self._decompressor or self._create_decompressor()
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return decompressor.decompress(data + b'\x00\x00\xff\xff')
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|
|
|
|
class WebSocketProtocol13(WebSocketProtocol):
|
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"""Implementation of the WebSocket protocol from RFC 6455.
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|
|
|
This class supports versions 7 and 8 of the protocol in addition to the
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final version 13.
|
|
"""
|
|
# Bit masks for the first byte of a frame.
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|
FIN = 0x80
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RSV1 = 0x40
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RSV2 = 0x20
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RSV3 = 0x10
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RSV_MASK = RSV1 | RSV2 | RSV3
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OPCODE_MASK = 0x0f
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|
|
def __init__(self, handler, mask_outgoing=False,
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compression_options=None):
|
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WebSocketProtocol.__init__(self, handler)
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self.mask_outgoing = mask_outgoing
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self._final_frame = False
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self._frame_opcode = None
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|
self._masked_frame = None
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|
self._frame_mask = None
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|
self._frame_length = None
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self._fragmented_message_buffer = None
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self._fragmented_message_opcode = None
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self._waiting = None
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|
self._compression_options = compression_options
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self._decompressor = None
|
|
self._compressor = None
|
|
self._frame_compressed = None
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# The total uncompressed size of all messages received or sent.
|
|
# Unicode messages are encoded to utf8.
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|
# Only for testing; subject to change.
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|
self._message_bytes_in = 0
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self._message_bytes_out = 0
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# The total size of all packets received or sent. Includes
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# the effect of compression, frame overhead, and control frames.
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|
self._wire_bytes_in = 0
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self._wire_bytes_out = 0
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|
|
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def accept_connection(self):
|
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try:
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self._handle_websocket_headers()
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|
self._accept_connection()
|
|
except ValueError:
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|
gen_log.debug("Malformed WebSocket request received", exc_info=True)
|
|
self._abort()
|
|
return
|
|
|
|
def _handle_websocket_headers(self):
|
|
"""Verifies all invariant- and required headers
|
|
|
|
If a header is missing or have an incorrect value ValueError will be
|
|
raised
|
|
"""
|
|
fields = ("Host", "Sec-Websocket-Key", "Sec-Websocket-Version")
|
|
if not all(map(lambda f: self.request.headers.get(f), fields)):
|
|
raise ValueError("Missing/Invalid WebSocket headers")
|
|
|
|
@staticmethod
|
|
def compute_accept_value(key):
|
|
"""Computes the value for the Sec-WebSocket-Accept header,
|
|
given the value for Sec-WebSocket-Key.
|
|
"""
|
|
sha1 = hashlib.sha1()
|
|
sha1.update(utf8(key))
|
|
sha1.update(b"258EAFA5-E914-47DA-95CA-C5AB0DC85B11") # Magic value
|
|
return native_str(base64.b64encode(sha1.digest()))
|
|
|
|
def _challenge_response(self):
|
|
return WebSocketProtocol13.compute_accept_value(
|
|
self.request.headers.get("Sec-Websocket-Key"))
|
|
|
|
def _accept_connection(self):
|
|
subprotocol_header = ''
|
|
subprotocols = self.request.headers.get("Sec-WebSocket-Protocol", '')
|
|
subprotocols = [s.strip() for s in subprotocols.split(',')]
|
|
if subprotocols:
|
|
selected = self.handler.select_subprotocol(subprotocols)
|
|
if selected:
|
|
assert selected in subprotocols
|
|
subprotocol_header = "Sec-WebSocket-Protocol: %s\r\n" % selected
|
|
|
|
extension_header = ''
|
|
extensions = self._parse_extensions_header(self.request.headers)
|
|
for ext in extensions:
|
|
if (ext[0] == 'permessage-deflate' and
|
|
self._compression_options is not None):
|
|
# TODO: negotiate parameters if compression_options
|
|
# specifies limits.
|
|
self._create_compressors('server', ext[1])
|
|
if ('client_max_window_bits' in ext[1] and
|
|
ext[1]['client_max_window_bits'] is None):
|
|
# Don't echo an offered client_max_window_bits
|
|
# parameter with no value.
|
|
del ext[1]['client_max_window_bits']
|
|
extension_header = ('Sec-WebSocket-Extensions: %s\r\n' %
|
|
httputil._encode_header(
|
|
'permessage-deflate', ext[1]))
|
|
break
|
|
|
|
if self.stream.closed():
|
|
self._abort()
|
|
return
|
|
self.stream.write(tornado.escape.utf8(
|
|
"HTTP/1.1 101 Switching Protocols\r\n"
|
|
"Upgrade: websocket\r\n"
|
|
"Connection: Upgrade\r\n"
|
|
"Sec-WebSocket-Accept: %s\r\n"
|
|
"%s%s"
|
|
"\r\n" % (self._challenge_response(),
|
|
subprotocol_header, extension_header)))
|
|
|
|
self._run_callback(self.handler.open, *self.handler.open_args,
|
|
**self.handler.open_kwargs)
|
|
self._receive_frame()
|
|
|
|
def _parse_extensions_header(self, headers):
|
|
extensions = headers.get("Sec-WebSocket-Extensions", '')
|
|
if extensions:
|
|
return [httputil._parse_header(e.strip())
|
|
for e in extensions.split(',')]
|
|
return []
|
|
|
|
def _process_server_headers(self, key, headers):
|
|
"""Process the headers sent by the server to this client connection.
|
|
|
|
'key' is the websocket handshake challenge/response key.
|
|
"""
|
|
assert headers['Upgrade'].lower() == 'websocket'
|
|
assert headers['Connection'].lower() == 'upgrade'
|
|
accept = self.compute_accept_value(key)
|
|
assert headers['Sec-Websocket-Accept'] == accept
|
|
|
|
extensions = self._parse_extensions_header(headers)
|
|
for ext in extensions:
|
|
if (ext[0] == 'permessage-deflate' and
|
|
self._compression_options is not None):
|
|
self._create_compressors('client', ext[1])
|
|
else:
|
|
raise ValueError("unsupported extension %r", ext)
|
|
|
|
def _get_compressor_options(self, side, agreed_parameters):
|
|
"""Converts a websocket agreed_parameters set to keyword arguments
|
|
for our compressor objects.
|
|
"""
|
|
options = dict(
|
|
persistent=(side + '_no_context_takeover') not in agreed_parameters)
|
|
wbits_header = agreed_parameters.get(side + '_max_window_bits', None)
|
|
if wbits_header is None:
|
|
options['max_wbits'] = zlib.MAX_WBITS
|
|
else:
|
|
options['max_wbits'] = int(wbits_header)
|
|
return options
|
|
|
|
def _create_compressors(self, side, agreed_parameters):
|
|
# TODO: handle invalid parameters gracefully
|
|
allowed_keys = set(['server_no_context_takeover',
|
|
'client_no_context_takeover',
|
|
'server_max_window_bits',
|
|
'client_max_window_bits'])
|
|
for key in agreed_parameters:
|
|
if key not in allowed_keys:
|
|
raise ValueError("unsupported compression parameter %r" % key)
|
|
other_side = 'client' if (side == 'server') else 'server'
|
|
self._compressor = _PerMessageDeflateCompressor(
|
|
**self._get_compressor_options(side, agreed_parameters))
|
|
self._decompressor = _PerMessageDeflateDecompressor(
|
|
**self._get_compressor_options(other_side, agreed_parameters))
|
|
|
|
def _write_frame(self, fin, opcode, data, flags=0):
|
|
if fin:
|
|
finbit = self.FIN
|
|
else:
|
|
finbit = 0
|
|
frame = struct.pack("B", finbit | opcode | flags)
|
|
l = len(data)
|
|
if self.mask_outgoing:
|
|
mask_bit = 0x80
|
|
else:
|
|
mask_bit = 0
|
|
if l < 126:
|
|
frame += struct.pack("B", l | mask_bit)
|
|
elif l <= 0xFFFF:
|
|
frame += struct.pack("!BH", 126 | mask_bit, l)
|
|
else:
|
|
frame += struct.pack("!BQ", 127 | mask_bit, l)
|
|
if self.mask_outgoing:
|
|
mask = os.urandom(4)
|
|
data = mask + _websocket_mask(mask, data)
|
|
frame += data
|
|
self._wire_bytes_out += len(frame)
|
|
try:
|
|
self.stream.write(frame)
|
|
except StreamClosedError:
|
|
self._abort()
|
|
|
|
def write_message(self, message, binary=False):
|
|
"""Sends the given message to the client of this Web Socket."""
|
|
if binary:
|
|
opcode = 0x2
|
|
else:
|
|
opcode = 0x1
|
|
message = tornado.escape.utf8(message)
|
|
assert isinstance(message, bytes)
|
|
self._message_bytes_out += len(message)
|
|
flags = 0
|
|
if self._compressor:
|
|
message = self._compressor.compress(message)
|
|
flags |= self.RSV1
|
|
self._write_frame(True, opcode, message, flags=flags)
|
|
|
|
def write_ping(self, data):
|
|
"""Send ping frame."""
|
|
assert isinstance(data, bytes)
|
|
self._write_frame(True, 0x9, data)
|
|
|
|
def _receive_frame(self):
|
|
try:
|
|
self.stream.read_bytes(2, self._on_frame_start)
|
|
except StreamClosedError:
|
|
self._abort()
|
|
|
|
def _on_frame_start(self, data):
|
|
self._wire_bytes_in += len(data)
|
|
header, payloadlen = struct.unpack("BB", data)
|
|
self._final_frame = header & self.FIN
|
|
reserved_bits = header & self.RSV_MASK
|
|
self._frame_opcode = header & self.OPCODE_MASK
|
|
self._frame_opcode_is_control = self._frame_opcode & 0x8
|
|
if self._decompressor is not None:
|
|
self._frame_compressed = bool(reserved_bits & self.RSV1)
|
|
reserved_bits &= ~self.RSV1
|
|
if reserved_bits:
|
|
# client is using as-yet-undefined extensions; abort
|
|
self._abort()
|
|
return
|
|
self._masked_frame = bool(payloadlen & 0x80)
|
|
payloadlen = payloadlen & 0x7f
|
|
if self._frame_opcode_is_control and payloadlen >= 126:
|
|
# control frames must have payload < 126
|
|
self._abort()
|
|
return
|
|
try:
|
|
if payloadlen < 126:
|
|
self._frame_length = payloadlen
|
|
if self._masked_frame:
|
|
self.stream.read_bytes(4, self._on_masking_key)
|
|
else:
|
|
self.stream.read_bytes(self._frame_length, self._on_frame_data)
|
|
elif payloadlen == 126:
|
|
self.stream.read_bytes(2, self._on_frame_length_16)
|
|
elif payloadlen == 127:
|
|
self.stream.read_bytes(8, self._on_frame_length_64)
|
|
except StreamClosedError:
|
|
self._abort()
|
|
|
|
def _on_frame_length_16(self, data):
|
|
self._wire_bytes_in += len(data)
|
|
self._frame_length = struct.unpack("!H", data)[0]
|
|
try:
|
|
if self._masked_frame:
|
|
self.stream.read_bytes(4, self._on_masking_key)
|
|
else:
|
|
self.stream.read_bytes(self._frame_length, self._on_frame_data)
|
|
except StreamClosedError:
|
|
self._abort()
|
|
|
|
def _on_frame_length_64(self, data):
|
|
self._wire_bytes_in += len(data)
|
|
self._frame_length = struct.unpack("!Q", data)[0]
|
|
try:
|
|
if self._masked_frame:
|
|
self.stream.read_bytes(4, self._on_masking_key)
|
|
else:
|
|
self.stream.read_bytes(self._frame_length, self._on_frame_data)
|
|
except StreamClosedError:
|
|
self._abort()
|
|
|
|
def _on_masking_key(self, data):
|
|
self._wire_bytes_in += len(data)
|
|
self._frame_mask = data
|
|
try:
|
|
self.stream.read_bytes(self._frame_length, self._on_masked_frame_data)
|
|
except StreamClosedError:
|
|
self._abort()
|
|
|
|
def _on_masked_frame_data(self, data):
|
|
# Don't touch _wire_bytes_in; we'll do it in _on_frame_data.
|
|
self._on_frame_data(_websocket_mask(self._frame_mask, data))
|
|
|
|
def _on_frame_data(self, data):
|
|
self._wire_bytes_in += len(data)
|
|
if self._frame_opcode_is_control:
|
|
# control frames may be interleaved with a series of fragmented
|
|
# data frames, so control frames must not interact with
|
|
# self._fragmented_*
|
|
if not self._final_frame:
|
|
# control frames must not be fragmented
|
|
self._abort()
|
|
return
|
|
opcode = self._frame_opcode
|
|
elif self._frame_opcode == 0: # continuation frame
|
|
if self._fragmented_message_buffer is None:
|
|
# nothing to continue
|
|
self._abort()
|
|
return
|
|
self._fragmented_message_buffer += data
|
|
if self._final_frame:
|
|
opcode = self._fragmented_message_opcode
|
|
data = self._fragmented_message_buffer
|
|
self._fragmented_message_buffer = None
|
|
else: # start of new data message
|
|
if self._fragmented_message_buffer is not None:
|
|
# can't start new message until the old one is finished
|
|
self._abort()
|
|
return
|
|
if self._final_frame:
|
|
opcode = self._frame_opcode
|
|
else:
|
|
self._fragmented_message_opcode = self._frame_opcode
|
|
self._fragmented_message_buffer = data
|
|
|
|
if self._final_frame:
|
|
self._handle_message(opcode, data)
|
|
|
|
if not self.client_terminated:
|
|
self._receive_frame()
|
|
|
|
def _handle_message(self, opcode, data):
|
|
if self.client_terminated:
|
|
return
|
|
|
|
if self._frame_compressed:
|
|
data = self._decompressor.decompress(data)
|
|
|
|
if opcode == 0x1:
|
|
# UTF-8 data
|
|
self._message_bytes_in += len(data)
|
|
try:
|
|
decoded = data.decode("utf-8")
|
|
except UnicodeDecodeError:
|
|
self._abort()
|
|
return
|
|
self._run_callback(self.handler.on_message, decoded)
|
|
elif opcode == 0x2:
|
|
# Binary data
|
|
self._message_bytes_in += len(data)
|
|
self._run_callback(self.handler.on_message, data)
|
|
elif opcode == 0x8:
|
|
# Close
|
|
self.client_terminated = True
|
|
if len(data) >= 2:
|
|
self.handler.close_code = struct.unpack('>H', data[:2])[0]
|
|
if len(data) > 2:
|
|
self.handler.close_reason = to_unicode(data[2:])
|
|
self.close()
|
|
elif opcode == 0x9:
|
|
# Ping
|
|
self._write_frame(True, 0xA, data)
|
|
elif opcode == 0xA:
|
|
# Pong
|
|
self._run_callback(self.handler.on_pong, data)
|
|
else:
|
|
self._abort()
|
|
|
|
def close(self, code=None, reason=None):
|
|
"""Closes the WebSocket connection."""
|
|
if not self.server_terminated:
|
|
if not self.stream.closed():
|
|
if code is None and reason is not None:
|
|
code = 1000 # "normal closure" status code
|
|
if code is None:
|
|
close_data = b''
|
|
else:
|
|
close_data = struct.pack('>H', code)
|
|
if reason is not None:
|
|
close_data += utf8(reason)
|
|
self._write_frame(True, 0x8, close_data)
|
|
self.server_terminated = True
|
|
if self.client_terminated:
|
|
if self._waiting is not None:
|
|
self.stream.io_loop.remove_timeout(self._waiting)
|
|
self._waiting = None
|
|
self.stream.close()
|
|
elif self._waiting is None:
|
|
# Give the client a few seconds to complete a clean shutdown,
|
|
# otherwise just close the connection.
|
|
self._waiting = self.stream.io_loop.add_timeout(
|
|
self.stream.io_loop.time() + 5, self._abort)
|
|
|
|
|
|
class WebSocketClientConnection(simple_httpclient._HTTPConnection):
|
|
"""WebSocket client connection.
|
|
|
|
This class should not be instantiated directly; use the
|
|
`websocket_connect` function instead.
|
|
"""
|
|
def __init__(self, io_loop, request, on_message_callback=None,
|
|
compression_options=None):
|
|
self.compression_options = compression_options
|
|
self.connect_future = TracebackFuture()
|
|
self.protocol = None
|
|
self.read_future = None
|
|
self.read_queue = collections.deque()
|
|
self.key = base64.b64encode(os.urandom(16))
|
|
self._on_message_callback = on_message_callback
|
|
|
|
scheme, sep, rest = request.url.partition(':')
|
|
scheme = {'ws': 'http', 'wss': 'https'}[scheme]
|
|
request.url = scheme + sep + rest
|
|
request.headers.update({
|
|
'Upgrade': 'websocket',
|
|
'Connection': 'Upgrade',
|
|
'Sec-WebSocket-Key': self.key,
|
|
'Sec-WebSocket-Version': '13',
|
|
})
|
|
if self.compression_options is not None:
|
|
# Always offer to let the server set our max_wbits (and even though
|
|
# we don't offer it, we will accept a client_no_context_takeover
|
|
# from the server).
|
|
# TODO: set server parameters for deflate extension
|
|
# if requested in self.compression_options.
|
|
request.headers['Sec-WebSocket-Extensions'] = (
|
|
'permessage-deflate; client_max_window_bits')
|
|
|
|
self.tcp_client = TCPClient(io_loop=io_loop)
|
|
super(WebSocketClientConnection, self).__init__(
|
|
io_loop, None, request, lambda: None, self._on_http_response,
|
|
104857600, self.tcp_client, 65536)
|
|
|
|
def close(self, code=None, reason=None):
|
|
"""Closes the websocket connection.
|
|
|
|
``code`` and ``reason`` are documented under
|
|
`WebSocketHandler.close`.
|
|
|
|
.. versionadded:: 3.2
|
|
|
|
.. versionchanged:: 4.0
|
|
|
|
Added the ``code`` and ``reason`` arguments.
|
|
"""
|
|
if self.protocol is not None:
|
|
self.protocol.close(code, reason)
|
|
self.protocol = None
|
|
|
|
def on_connection_close(self):
|
|
if not self.connect_future.done():
|
|
self.connect_future.set_exception(StreamClosedError())
|
|
self.on_message(None)
|
|
self.tcp_client.close()
|
|
super(WebSocketClientConnection, self).on_connection_close()
|
|
|
|
def _on_http_response(self, response):
|
|
if not self.connect_future.done():
|
|
if response.error:
|
|
self.connect_future.set_exception(response.error)
|
|
else:
|
|
self.connect_future.set_exception(WebSocketError(
|
|
"Non-websocket response"))
|
|
|
|
def headers_received(self, start_line, headers):
|
|
if start_line.code != 101:
|
|
return super(WebSocketClientConnection, self).headers_received(
|
|
start_line, headers)
|
|
|
|
self.headers = headers
|
|
self.protocol = self.get_websocket_protocol()
|
|
self.protocol._process_server_headers(self.key, self.headers)
|
|
self.protocol._receive_frame()
|
|
|
|
if self._timeout is not None:
|
|
self.io_loop.remove_timeout(self._timeout)
|
|
self._timeout = None
|
|
|
|
self.stream = self.connection.detach()
|
|
self.stream.set_close_callback(self.on_connection_close)
|
|
# Once we've taken over the connection, clear the final callback
|
|
# we set on the http request. This deactivates the error handling
|
|
# in simple_httpclient that would otherwise interfere with our
|
|
# ability to see exceptions.
|
|
self.final_callback = None
|
|
|
|
self.connect_future.set_result(self)
|
|
|
|
def write_message(self, message, binary=False):
|
|
"""Sends a message to the WebSocket server."""
|
|
self.protocol.write_message(message, binary)
|
|
|
|
def read_message(self, callback=None):
|
|
"""Reads a message from the WebSocket server.
|
|
|
|
If on_message_callback was specified at WebSocket
|
|
initialization, this function will never return messages
|
|
|
|
Returns a future whose result is the message, or None
|
|
if the connection is closed. If a callback argument
|
|
is given it will be called with the future when it is
|
|
ready.
|
|
"""
|
|
assert self.read_future is None
|
|
future = TracebackFuture()
|
|
if self.read_queue:
|
|
future.set_result(self.read_queue.popleft())
|
|
else:
|
|
self.read_future = future
|
|
if callback is not None:
|
|
self.io_loop.add_future(future, callback)
|
|
return future
|
|
|
|
def on_message(self, message):
|
|
if self._on_message_callback:
|
|
self._on_message_callback(message)
|
|
elif self.read_future is not None:
|
|
self.read_future.set_result(message)
|
|
self.read_future = None
|
|
else:
|
|
self.read_queue.append(message)
|
|
|
|
def on_pong(self, data):
|
|
pass
|
|
|
|
def get_websocket_protocol(self):
|
|
return WebSocketProtocol13(self, mask_outgoing=True,
|
|
compression_options=self.compression_options)
|
|
|
|
|
|
def websocket_connect(url, io_loop=None, callback=None, connect_timeout=None,
|
|
on_message_callback=None, compression_options=None):
|
|
"""Client-side websocket support.
|
|
|
|
Takes a url and returns a Future whose result is a
|
|
`WebSocketClientConnection`.
|
|
|
|
``compression_options`` is interpreted in the same way as the
|
|
return value of `.WebSocketHandler.get_compression_options`.
|
|
|
|
The connection supports two styles of operation. In the coroutine
|
|
style, the application typically calls
|
|
`~.WebSocketClientConnection.read_message` in a loop::
|
|
|
|
conn = yield websocket_connection(loop)
|
|
while True:
|
|
msg = yield conn.read_message()
|
|
if msg is None: break
|
|
# Do something with msg
|
|
|
|
In the callback style, pass an ``on_message_callback`` to
|
|
``websocket_connect``. In both styles, a message of ``None``
|
|
indicates that the connection has been closed.
|
|
|
|
.. versionchanged:: 3.2
|
|
Also accepts ``HTTPRequest`` objects in place of urls.
|
|
|
|
.. versionchanged:: 4.1
|
|
Added ``compression_options`` and ``on_message_callback``.
|
|
The ``io_loop`` argument is deprecated.
|
|
"""
|
|
if io_loop is None:
|
|
io_loop = IOLoop.current()
|
|
if isinstance(url, httpclient.HTTPRequest):
|
|
assert connect_timeout is None
|
|
request = url
|
|
# Copy and convert the headers dict/object (see comments in
|
|
# AsyncHTTPClient.fetch)
|
|
request.headers = httputil.HTTPHeaders(request.headers)
|
|
else:
|
|
request = httpclient.HTTPRequest(url, connect_timeout=connect_timeout)
|
|
request = httpclient._RequestProxy(
|
|
request, httpclient.HTTPRequest._DEFAULTS)
|
|
conn = WebSocketClientConnection(io_loop, request,
|
|
on_message_callback=on_message_callback,
|
|
compression_options=compression_options)
|
|
if callback is not None:
|
|
io_loop.add_future(conn.connect_future, callback)
|
|
return conn.connect_future
|