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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
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tree10027f336435511475e392454359edea8e25895d /testing/mochitest/pywebsocket/mod_pywebsocket/headerparserhandler.py
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+# Copyright 2011, 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.
+
+
+"""PythonHeaderParserHandler for mod_pywebsocket.
+
+Apache HTTP Server and mod_python must be configured such that this
+function is called to handle WebSocket request.
+"""
+
+
+import logging
+
+from mod_python import apache
+
+from mod_pywebsocket import common
+from mod_pywebsocket import dispatch
+from mod_pywebsocket import handshake
+from mod_pywebsocket import util
+
+
+# PythonOption to specify the handler root directory.
+_PYOPT_HANDLER_ROOT = 'mod_pywebsocket.handler_root'
+
+# PythonOption to specify the handler scan directory.
+# This must be a directory under the root directory.
+# The default is the root directory.
+_PYOPT_HANDLER_SCAN = 'mod_pywebsocket.handler_scan'
+
+# PythonOption to allow handlers whose canonical path is
+# not under the root directory. It's disallowed by default.
+# Set this option with value of 'yes' to allow.
+_PYOPT_ALLOW_HANDLERS_OUTSIDE_ROOT = (
+ 'mod_pywebsocket.allow_handlers_outside_root_dir')
+# Map from values to their meanings. 'Yes' and 'No' are allowed just for
+# compatibility.
+_PYOPT_ALLOW_HANDLERS_OUTSIDE_ROOT_DEFINITION = {
+ 'off': False, 'no': False, 'on': True, 'yes': True}
+
+# (Obsolete option. Ignored.)
+# PythonOption to specify to allow handshake defined in Hixie 75 version
+# protocol. The default is None (Off)
+_PYOPT_ALLOW_DRAFT75 = 'mod_pywebsocket.allow_draft75'
+# Map from values to their meanings.
+_PYOPT_ALLOW_DRAFT75_DEFINITION = {'off': False, 'on': True}
+
+
+class ApacheLogHandler(logging.Handler):
+ """Wrapper logging.Handler to emit log message to apache's error.log."""
+
+ _LEVELS = {
+ logging.DEBUG: apache.APLOG_DEBUG,
+ logging.INFO: apache.APLOG_INFO,
+ logging.WARNING: apache.APLOG_WARNING,
+ logging.ERROR: apache.APLOG_ERR,
+ logging.CRITICAL: apache.APLOG_CRIT,
+ }
+
+ def __init__(self, request=None):
+ logging.Handler.__init__(self)
+ self._log_error = apache.log_error
+ if request is not None:
+ self._log_error = request.log_error
+
+ # Time and level will be printed by Apache.
+ self._formatter = logging.Formatter('%(name)s: %(message)s')
+
+ def emit(self, record):
+ apache_level = apache.APLOG_DEBUG
+ if record.levelno in ApacheLogHandler._LEVELS:
+ apache_level = ApacheLogHandler._LEVELS[record.levelno]
+
+ msg = self._formatter.format(record)
+
+ # "server" parameter must be passed to have "level" parameter work.
+ # If only "level" parameter is passed, nothing shows up on Apache's
+ # log. However, at this point, we cannot get the server object of the
+ # virtual host which will process WebSocket requests. The only server
+ # object we can get here is apache.main_server. But Wherever (server
+ # configuration context or virtual host context) we put
+ # PythonHeaderParserHandler directive, apache.main_server just points
+ # the main server instance (not any of virtual server instance). Then,
+ # Apache follows LogLevel directive in the server configuration context
+ # to filter logs. So, we need to specify LogLevel in the server
+ # configuration context. Even if we specify "LogLevel debug" in the
+ # virtual host context which actually handles WebSocket connections,
+ # DEBUG level logs never show up unless "LogLevel debug" is specified
+ # in the server configuration context.
+ #
+ # TODO(tyoshino): Provide logging methods on request object. When
+ # request is mp_request object (when used together with Apache), the
+ # methods call request.log_error indirectly. When request is
+ # _StandaloneRequest, the methods call Python's logging facility which
+ # we create in standalone.py.
+ self._log_error(msg, apache_level, apache.main_server)
+
+
+def _configure_logging():
+ logger = logging.getLogger()
+ # Logs are filtered by Apache based on LogLevel directive in Apache
+ # configuration file. We must just pass logs for all levels to
+ # ApacheLogHandler.
+ logger.setLevel(logging.DEBUG)
+ logger.addHandler(ApacheLogHandler())
+
+
+_configure_logging()
+
+_LOGGER = logging.getLogger(__name__)
+
+
+def _parse_option(name, value, definition):
+ if value is None:
+ return False
+
+ meaning = definition.get(value.lower())
+ if meaning is None:
+ raise Exception('Invalid value for PythonOption %s: %r' %
+ (name, value))
+ return meaning
+
+
+def _create_dispatcher():
+ _LOGGER.info('Initializing Dispatcher')
+
+ options = apache.main_server.get_options()
+
+ handler_root = options.get(_PYOPT_HANDLER_ROOT, None)
+ if not handler_root:
+ raise Exception('PythonOption %s is not defined' % _PYOPT_HANDLER_ROOT,
+ apache.APLOG_ERR)
+
+ handler_scan = options.get(_PYOPT_HANDLER_SCAN, handler_root)
+
+ allow_handlers_outside_root = _parse_option(
+ _PYOPT_ALLOW_HANDLERS_OUTSIDE_ROOT,
+ options.get(_PYOPT_ALLOW_HANDLERS_OUTSIDE_ROOT),
+ _PYOPT_ALLOW_HANDLERS_OUTSIDE_ROOT_DEFINITION)
+
+ dispatcher = dispatch.Dispatcher(
+ handler_root, handler_scan, allow_handlers_outside_root)
+
+ for warning in dispatcher.source_warnings():
+ apache.log_error(
+ 'mod_pywebsocket: Warning in source loading: %s' % warning,
+ apache.APLOG_WARNING)
+
+ return dispatcher
+
+
+# Initialize
+_dispatcher = _create_dispatcher()
+
+
+def headerparserhandler(request):
+ """Handle request.
+
+ Args:
+ request: mod_python request.
+
+ This function is named headerparserhandler because it is the default
+ name for a PythonHeaderParserHandler.
+ """
+
+ handshake_is_done = False
+ try:
+ # Fallback to default http handler for request paths for which
+ # we don't have request handlers.
+ if not _dispatcher.get_handler_suite(request.uri):
+ request.log_error(
+ 'mod_pywebsocket: No handler for resource: %r' % request.uri,
+ apache.APLOG_INFO)
+ request.log_error(
+ 'mod_pywebsocket: Fallback to Apache', apache.APLOG_INFO)
+ return apache.DECLINED
+ except dispatch.DispatchException, e:
+ request.log_error(
+ 'mod_pywebsocket: Dispatch failed for error: %s' % e,
+ apache.APLOG_INFO)
+ if not handshake_is_done:
+ return e.status
+
+ try:
+ allow_draft75 = _parse_option(
+ _PYOPT_ALLOW_DRAFT75,
+ apache.main_server.get_options().get(_PYOPT_ALLOW_DRAFT75),
+ _PYOPT_ALLOW_DRAFT75_DEFINITION)
+
+ try:
+ handshake.do_handshake(
+ request, _dispatcher, allowDraft75=allow_draft75)
+ except handshake.VersionException, e:
+ request.log_error(
+ 'mod_pywebsocket: Handshake failed for version error: %s' % e,
+ apache.APLOG_INFO)
+ request.err_headers_out.add(common.SEC_WEBSOCKET_VERSION_HEADER,
+ e.supported_versions)
+ return apache.HTTP_BAD_REQUEST
+ except handshake.HandshakeException, e:
+ # Handshake for ws/wss failed.
+ # Send http response with error status.
+ request.log_error(
+ 'mod_pywebsocket: Handshake failed for error: %s' % e,
+ apache.APLOG_INFO)
+ return e.status
+
+ handshake_is_done = True
+ request._dispatcher = _dispatcher
+ _dispatcher.transfer_data(request)
+ except handshake.AbortedByUserException, e:
+ request.log_error('mod_pywebsocket: Aborted: %s' % e, apache.APLOG_INFO)
+ except Exception, e:
+ # DispatchException can also be thrown if something is wrong in
+ # pywebsocket code. It's caught here, then.
+
+ request.log_error('mod_pywebsocket: Exception occurred: %s\n%s' %
+ (e, util.get_stack_trace()),
+ apache.APLOG_ERR)
+ # Unknown exceptions before handshake mean Apache must handle its
+ # request with another handler.
+ if not handshake_is_done:
+ return apache.DECLINED
+ # Set assbackwards to suppress response header generation by Apache.
+ request.assbackwards = 1
+ return apache.DONE # Return DONE such that no other handlers are invoked.
+
+
+# vi:sts=4 sw=4 et