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https://gitlab.winehq.org/wine/wine-gecko.git
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127 lines
4.5 KiB
Python
127 lines
4.5 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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"""Common functions and exceptions used by WebSocket opening handshake
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processors.
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"""
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from mod_pywebsocket import common
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class HandshakeError(Exception):
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"""This exception will be raised when an error occurred while processing
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WebSocket initial handshake.
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"""
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pass
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def get_default_port(is_secure):
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if is_secure:
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return common.DEFAULT_WEB_SOCKET_SECURE_PORT
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else:
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return common.DEFAULT_WEB_SOCKET_PORT
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# TODO(tyoshino): Have stricter validator for HyBi 07.
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def validate_subprotocol(subprotocol):
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"""Validate a value in subprotocol fields such as WebSocket-Protocol,
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Sec-WebSocket-Protocol.
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See
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- HyBi 06: Section 5.2.2.
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- HyBi 00: Section 4.1. Opening handshake
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- Hixie 75: Section 4.1. Handshake
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"""
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if not subprotocol:
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raise HandshakeError('Invalid subprotocol name: empty')
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for c in subprotocol:
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if not 0x20 <= ord(c) <= 0x7e:
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raise HandshakeError(
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'Illegal character in subprotocol name: %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], get_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(common.WEB_SOCKET_SECURE_SCHEME)
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else:
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location_parts.append(common.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 != get_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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def get_mandatory_header(request, key, expected_value=None):
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value = request.headers_in.get(key)
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if value is None:
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raise HandshakeError('Header %s is not defined' % key)
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if expected_value is not None and expected_value != value:
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raise HandshakeError(
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'Illegal value for header %s: %s (expected: %s)' %
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(key, value, expected_value))
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return value
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def check_header_lines(request, mandatory_headers):
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# 5.1 1. The three character UTF-8 string "GET".
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# 5.1 2. A UTF-8-encoded U+0020 SPACE character (0x20 byte).
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if request.method != 'GET':
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raise HandshakeError('Method is not GET')
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# The expected field names, and the meaning of their corresponding
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# values, are as follows.
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# |Upgrade| and |Connection|
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for key, expected_value in mandatory_headers:
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get_mandatory_header(request, key, expected_value)
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# vi:sts=4 sw=4 et
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