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102 lines
3.5 KiB
Python
102 lines
3.5 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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DEFAULT_WEB_SOCKET_PORT = 80
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DEFAULT_WEB_SOCKET_SECURE_PORT = 443
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WEB_SOCKET_SCHEME = 'ws'
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WEB_SOCKET_SECURE_SCHEME = 'wss'
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class HandshakeError(Exception):
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"""Exception in Web Socket Handshake."""
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pass
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def default_port(is_secure):
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if is_secure:
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return DEFAULT_WEB_SOCKET_SECURE_PORT
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else:
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return DEFAULT_WEB_SOCKET_PORT
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def validate_protocol(protocol):
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"""Validate WebSocket-Protocol string."""
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if not protocol:
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raise HandshakeError('Invalid WebSocket-Protocol: empty')
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for c in protocol:
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if not 0x20 <= ord(c) <= 0x7e:
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raise HandshakeError('Illegal character in protocol: %r' % c)
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def parse_host_header(request):
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fields = request.headers_in['Host'].split(':', 1)
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if len(fields) == 1:
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return fields[0], default_port(request.is_https())
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try:
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return fields[0], int(fields[1])
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except ValueError, e:
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raise HandshakeError('Invalid port number format: %r' % e)
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def build_location(request):
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"""Build WebSocket location for request."""
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location_parts = []
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if request.is_https():
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location_parts.append(WEB_SOCKET_SECURE_SCHEME)
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else:
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location_parts.append(WEB_SOCKET_SCHEME)
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location_parts.append('://')
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host, port = parse_host_header(request)
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connection_port = request.connection.local_addr[1]
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if port != connection_port:
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raise HandshakeError('Header/connection port mismatch: %d/%d' %
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(port, connection_port))
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location_parts.append(host)
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if (port != default_port(request.is_https())):
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location_parts.append(':')
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location_parts.append(str(port))
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location_parts.append(request.uri)
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return ''.join(location_parts)
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# vi:sts=4 sw=4 et
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