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117 lines
4.8 KiB
Python
117 lines
4.8 KiB
Python
# Copyright 2011, 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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"""WebSocket opening handshake processor. This class try to apply available
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opening handshake processors for each protocol version until a connection is
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successfully established.
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"""
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import logging
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from mod_pywebsocket import util
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from mod_pywebsocket.handshake import draft75
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from mod_pywebsocket.handshake import hybi00
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from mod_pywebsocket.handshake import hybi06
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# Export Extension symbol from this module.
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from mod_pywebsocket.handshake._base import Extension
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# Export HandshakeError symbol from this module.
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from mod_pywebsocket.handshake._base import HandshakeError
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class Handshaker(object):
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"""This class performs WebSocket 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 = util.get_class_logger(self)
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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._hybi07Handshaker = hybi06.Handshaker(request, dispatcher)
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self._hybi00Handshaker = hybi00.Handshaker(request, dispatcher)
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self._hixie75Handshaker = None
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if allowDraft75:
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self._hixie75Handshaker = draft75.Handshaker(
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request, dispatcher, strict)
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def do_handshake(self):
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"""Perform WebSocket Handshake."""
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self._logger.debug('Opening handshake resource: %r', self._request.uri)
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# To print mimetools.Message as escaped one-line string, we converts
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# headers_in to dict object. Without conversion, if we use %r, it just
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# prints the type and address, and if we use %s, it prints the original
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# header string as multiple lines.
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#
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# Both mimetools.Message and MpTable_Type of mod_python can be
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# converted to dict.
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#
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# mimetools.Message.__str__ returns the original header string.
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# dict(mimetools.Message object) returns the map from header names to
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# header values. While MpTable_Type doesn't have such __str__ but just
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# __repr__ which formats itself as well as dictionary object.
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self._logger.debug(
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'Opening handshake request headers: %r',
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dict(self._request.headers_in))
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handshakers = [
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('HyBi 07', self._hybi07Handshaker),
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('HyBi 00', self._hybi00Handshaker),
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('Hixie 75', self._hixie75Handshaker)]
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last_error = HandshakeError('No handshaker available')
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for name, handshaker in handshakers:
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if handshaker:
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self._logger.info('Trying %s protocol', name)
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try:
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handshaker.do_handshake()
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return
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except HandshakeError, e:
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self._logger.info('%s handshake failed: %s', name, e)
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last_error = e
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raise last_error
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# vi:sts=4 sw=4 et
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