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+# Copyright 2012, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+# * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+# * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+# * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+"""Common functions and exceptions used by WebSocket opening handshake
+processors.
+"""
+
+from __future__ import absolute_import
+from mod_pywebsocket import common
+from mod_pywebsocket import http_header_util
+
+
+class AbortedByUserException(Exception):
+ """Exception for aborting a connection intentionally.
+
+ If this exception is raised in do_extra_handshake handler, the connection
+ will be abandoned. No other WebSocket or HTTP(S) handler will be invoked.
+
+ If this exception is raised in transfer_data_handler, the connection will
+ be closed without closing handshake. No other WebSocket or HTTP(S) handler
+ will be invoked.
+ """
+
+ pass
+
+
+class HandshakeException(Exception):
+ """This exception will be raised when an error occurred while processing
+ WebSocket initial handshake.
+ """
+ def __init__(self, name, status=None):
+ super(HandshakeException, self).__init__(name)
+ self.status = status
+
+
+class VersionException(Exception):
+ """This exception will be raised when a version of client request does not
+ match with version the server supports.
+ """
+ def __init__(self, name, supported_versions=''):
+ """Construct an instance.
+
+ Args:
+ supported_version: a str object to show supported hybi versions.
+ (e.g. '13')
+ """
+ super(VersionException, self).__init__(name)
+ self.supported_versions = supported_versions
+
+
+def get_default_port(is_secure):
+ if is_secure:
+ return common.DEFAULT_WEB_SOCKET_SECURE_PORT
+ else:
+ return common.DEFAULT_WEB_SOCKET_PORT
+
+
+def validate_subprotocol(subprotocol):
+ """Validate a value in the Sec-WebSocket-Protocol field.
+
+ See the Section 4.1., 4.2.2., and 4.3. of RFC 6455.
+ """
+
+ if not subprotocol:
+ raise HandshakeException('Invalid subprotocol name: empty')
+
+ # Parameter should be encoded HTTP token.
+ state = http_header_util.ParsingState(subprotocol)
+ token = http_header_util.consume_token(state)
+ rest = http_header_util.peek(state)
+ # If |rest| is not None, |subprotocol| is not one token or invalid. If
+ # |rest| is None, |token| must not be None because |subprotocol| is
+ # concatenation of |token| and |rest| and is not None.
+ if rest is not None:
+ raise HandshakeException('Invalid non-token string in subprotocol '
+ 'name: %r' % rest)
+
+
+def parse_host_header(request):
+ fields = request.headers_in[common.HOST_HEADER].split(':', 1)
+ if len(fields) == 1:
+ return fields[0], get_default_port(request.is_https())
+ try:
+ return fields[0], int(fields[1])
+ except ValueError as e:
+ raise HandshakeException('Invalid port number format: %r' % e)
+
+
+def format_header(name, value):
+ return u'%s: %s\r\n' % (name, value)
+
+
+def get_mandatory_header(request, key):
+ value = request.headers_in.get(key)
+ if value is None:
+ raise HandshakeException('Header %s is not defined' % key)
+ return value
+
+
+def validate_mandatory_header(request, key, expected_value, fail_status=None):
+ value = get_mandatory_header(request, key)
+
+ if value.lower() != expected_value.lower():
+ raise HandshakeException(
+ 'Expected %r for header %s but found %r (case-insensitive)' %
+ (expected_value, key, value),
+ status=fail_status)
+
+
+def check_request_line(request):
+ # 5.1 1. The three character UTF-8 string "GET".
+ # 5.1 2. A UTF-8-encoded U+0020 SPACE character (0x20 byte).
+ if request.method != u'GET':
+ raise HandshakeException('Method is not GET: %r' % request.method)
+
+ if request.protocol != u'HTTP/1.1':
+ raise HandshakeException('Version is not HTTP/1.1: %r' %
+ request.protocol)
+
+
+def parse_token_list(data):
+ """Parses a header value which follows 1#token and returns parsed elements
+ as a list of strings.
+
+ Leading LWSes must be trimmed.
+ """
+
+ state = http_header_util.ParsingState(data)
+
+ token_list = []
+
+ while True:
+ token = http_header_util.consume_token(state)
+ if token is not None:
+ token_list.append(token)
+
+ http_header_util.consume_lwses(state)
+
+ if http_header_util.peek(state) is None:
+ break
+
+ if not http_header_util.consume_string(state, ','):
+ raise HandshakeException('Expected a comma but found %r' %
+ http_header_util.peek(state))
+
+ http_header_util.consume_lwses(state)
+
+ if len(token_list) == 0:
+ raise HandshakeException('No valid token found')
+
+ return token_list
+
+
+# vi:sts=4 sw=4 et