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96 lines
3.8 KiB
Python
96 lines
3.8 KiB
Python
# Copyright 2010, Google Inc.
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are
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# met:
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#
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# * Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# * Redistributions in binary form must reproduce the above
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# copyright notice, this list of conditions and the following disclaimer
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# in the documentation and/or other materials provided with the
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# distribution.
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# * Neither the name of Google Inc. nor the names of its
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# contributors may be used to endorse or promote products derived from
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# this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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"""Web Socket handshaking.
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Note: request.connection.write/read are used in this module, even though
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mod_python document says that they should be used only in connection handlers.
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Unfortunately, we have no other options. For example, request.write/read are
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not suitable because they don't allow direct raw bytes writing/reading.
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"""
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import logging
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import re
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from mod_pywebsocket.handshake import draft75
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from mod_pywebsocket.handshake import handshake
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from mod_pywebsocket.handshake._base import DEFAULT_WEB_SOCKET_PORT
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from mod_pywebsocket.handshake._base import DEFAULT_WEB_SOCKET_SECURE_PORT
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from mod_pywebsocket.handshake._base import WEB_SOCKET_SCHEME
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from mod_pywebsocket.handshake._base import WEB_SOCKET_SECURE_SCHEME
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from mod_pywebsocket.handshake._base import HandshakeError
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from mod_pywebsocket.handshake._base import validate_protocol
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class Handshaker(object):
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"""This class performs Web Socket handshake."""
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def __init__(self, request, dispatcher, allowDraft75=False, strict=False):
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"""Construct an instance.
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Args:
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request: mod_python request.
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dispatcher: Dispatcher (dispatch.Dispatcher).
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allowDraft75: allow draft 75 handshake protocol.
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strict: Strictly check handshake request in draft 75.
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Default: False. If True, request.connection must provide
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get_memorized_lines method.
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Handshaker will add attributes such as ws_resource in performing
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handshake.
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"""
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self._logger = logging.getLogger("mod_pywebsocket.handshake")
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self._request = request
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self._dispatcher = dispatcher
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self._strict = strict
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self._handshaker = handshake.Handshaker(request, dispatcher)
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self._fallbackHandshaker = None
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if allowDraft75:
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self._fallbackHandshaker = draft75.Handshaker(
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request, dispatcher, strict)
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def do_handshake(self):
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"""Perform Web Socket Handshake."""
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try:
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self._handshaker.do_handshake()
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except HandshakeError, e:
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self._logger.error('Handshake error: %s' % e)
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if self._fallbackHandshaker:
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self._logger.warning('fallback to old protocol')
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self._fallbackHandshaker.do_handshake()
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return
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raise e
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# vi:sts=4 sw=4 et
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