#!/usr/bin/env python
#
# Copyright 2011, Google Inc.
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"""Tests for handshake module."""
import unittest
import set_sys_path # Update sys.path to locate mod_pywebsocket module.
from mod_pywebsocket import common
from mod_pywebsocket.handshake._base import AbortedByUserException
from mod_pywebsocket.handshake._base import HandshakeException
from mod_pywebsocket.handshake._base import VersionException
from mod_pywebsocket.handshake.hybi import Handshaker
from test_handshake_hybi import _create_request
from test_handshake_hybi import _create_handshaker
from test_handshake_hybi import AbortedByUserDispatcher
from test_handshake_hybi import AbortingDispatcher
from test_handshake_hybi import HandshakeAbortedException
from test_handshake_hybi import RequestDefinition
from test_handshake_hybi import SubprotocolChoosingDispatcher
import mock
def _create_good_request_def():
return RequestDefinition(
'GET', '/demo',
{'Host': 'server.example.com',
'Upgrade': 'websocket',
'Connection': 'Upgrade',
'Sec-WebSocket-Key': 'dGhlIHNhbXBsZSBub25jZQ==',
'Sec-WebSocket-Origin': 'http://example.com',
'Sec-WebSocket-Version': '8'})
_EXPECTED_RESPONSE = (
'HTTP/1.1 101 Switching Protocols\r\n'
'Upgrade: websocket\r\n'
'Connection: Upgrade\r\n'
'Sec-WebSocket-Accept: s3pPLMBiTxaQ9kYGzzhZRbK+xOo=\r\n\r\n')
class HandshakerTest(unittest.TestCase):
"""A unittest for draft-ietf-hybi-thewebsocketprotocol-06 and later
handshake processor.
"""
def test_do_handshake(self):
request = _create_request(_create_good_request_def())
dispatcher = mock.MockDispatcher()
handshaker = Handshaker(request, dispatcher)
handshaker.do_handshake()
self.assertTrue(dispatcher.do_extra_handshake_called)
self.assertEqual(
_EXPECTED_RESPONSE, request.connection.written_data())
self.assertEqual('/demo', request.ws_resource)
self.assertEqual('http://example.com', request.ws_origin)
self.assertEqual(None, request.ws_protocol)
self.assertEqual(None, request.ws_extensions)
self.assertEqual(common.VERSION_HYBI08, request.ws_version)
def test_do_handshake_with_capitalized_value(self):
request_def = _create_good_request_def()
request_def.headers['upgrade'] = 'WEBSOCKET'
request = _create_request(request_def)
handshaker = _create_handshaker(request)
handshaker.do_handshake()
self.assertEqual(
_EXPECTED_RESPONSE, request.connection.written_data())
request_def = _create_good_request_def()
request_def.headers['Connection'] = 'UPGRADE'
request = _create_request(request_def)
handshaker = _create_handshaker(request)
handshaker.do_handshake()
self.assertEqual(
_EXPECTED_RESPONSE, request.connection.written_data())
def test_do_handshake_with_multiple_connection_values(self):
request_def = _create_good_request_def()
request_def.headers['Connection'] = 'Upgrade, keep-alive, , '
request = _create_request(request_def)
handshaker = _create_handshaker(request)
handshaker.do_handshake()
self.assertEqual(
_EXPECTED_RESPONSE, request.connection.written_data())
def test_aborting_handshake(self):
handshaker = Handshaker(
_create_request(_create_good_request_def()),
AbortingDispatcher())
# do_extra_handshake raises an exception. Check that it's not caught by
# do_handshake.
self.assertRaises(HandshakeAbortedException, handshaker.do_handshake)
def test_do_handshake_with_protocol(self):
request_def = _create_good_request_def()
request_def.headers['Sec-WebSocket-Protocol'] = 'chat, superchat'
request = _create_request(request_def)
handshaker = Handshaker(request, SubprotocolChoosingDispatcher(0))
handshaker.do_handshake()
EXPECTED_RESPONSE = (
'HTTP/1.1 101 Switching Protocols\r\n'
'Upgrade: websocket\r\n'
'Connection: Upgrade\r\n'
'Sec-WebSocket-Accept: s3pPLMBiTxaQ9kYGzzhZRbK+xOo=\r\n'
'Sec-WebSocket-Protocol: chat\r\n\r\n')
self.assertEqual(EXPECTED_RESPONSE, request.connection.written_data())
self.assertEqual('chat', request.ws_protocol)
def test_do_handshake_protocol_not_in_request_but_in_response(self):
request_def = _create_good_request_def()
request = _create_request(request_def)
handshaker = Handshaker(
request, SubprotocolChoosingDispatcher(-1, 'foobar'))
# No request has been made but ws_protocol is set. HandshakeException
# must be raised.
self.assertRaises(HandshakeException, handshaker.do_handshake)
def test_do_handshake_with_protocol_no_protocol_selection(self):
request_def = _create_good_request_def()
request_def.headers['Sec-WebSocket-Protocol'] = 'chat, superchat'
request = _create_request(request_def)
handshaker = _create_handshaker(request)
# ws_protocol is not set. HandshakeException must be raised.
self.assertRaises(HandshakeException, handshaker.do_handshake)
def test_do_handshake_with_extensions(self):
request_def = _create_good_request_def()
request_def.headers['Sec-WebSocket-Extensions'] = (
'permessage-compress; method=deflate, unknown')
EXPECTED_RESPONSE = (
'HTTP/1.1 101 Switching Protocols\r\n'
'Upgrade: websocket\r\n'
'Connection: Upgrade\r\n'
'Sec-WebSocket-Accept: s3pPLMBiTxaQ9kYGzzhZRbK+xOo=\r\n'
'Sec-WebSocket-Extensions: permessage-compress; method=deflate\r\n'
'\r\n')
request = _create_request(request_def)
handshaker = _create_handshaker(request)
handshaker.do_handshake()
self.assertEqual(EXPECTED_RESPONSE, request.connection.written_data())
self.assertEqual(1, len(request.ws_extensions))
extension = request.ws_extensions[0]
self.assertEqual(common.PERMESSAGE_COMPRESSION_EXTENSION,
extension.name())
self.assertEqual(['method'], extension.get_parameter_names())
self.assertEqual('deflate', extension.get_parameter_value('method'))
def test_do_handshake_with_quoted_extensions(self):
request_def = _create_good_request_def()
request_def.headers['Sec-WebSocket-Extensions'] = (
'permessage-compress; method=deflate, , '
'unknown; e = "mc^2"; ma="\r\n \\\rf "; pv=nrt')
request = _create_request(request_def)
handshaker = _create_handshaker(request)
self.assertRaises(HandshakeException, handshaker.do_handshake)
def test_do_handshake_with_optional_headers(self):
request_def = _create_good_request_def()
request_def.headers['EmptyValue'] = ''
request_def.headers['AKey'] = 'AValue'
request = _create_request(request_def)
handshaker = _create_handshaker(request)
handshaker.do_handshake()
self.assertEqual(
'AValue', request.headers_in['AKey'])
self.assertEqual(
'', request.headers_in['EmptyValue'])
def test_abort_extra_handshake(self):
handshaker = Handshaker(
_create_request(_create_good_request_def()),
AbortedByUserDispatcher())
# do_extra_handshake raises an AbortedByUserException. Check that it's
# not caught by do_handshake.
self.assertRaises(AbortedByUserException, handshaker.do_handshake)
def test_bad_requests(self):
bad_cases = [
('HTTP request',
RequestDefinition(
'GET', '/demo',
{'Host': 'www.google.com',
'User-Agent':
'Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5;'
' en-US; rv:1.9.1.3) Gecko/20090824 Firefox/3.5.3'
' GTB6 GTBA',
'Accept':
'text/html,application/xhtml+xml,application/xml;q=0.9,'
'*/*;q=0.8',
'Accept-Language': 'en-us,en;q=0.5',
'Accept-Encoding': 'gzip,deflate',
'Accept-Charset': 'ISO-8859-1,utf-8;q=0.7,*;q=0.7',
'Keep-Alive': '300',
'Connection': 'keep-alive'}), None, True)]
request_def = _create_good_request_def()
request_def.method = 'POST'
bad_cases.append(('Wrong method', request_def, None, True))
request_def = _create_good_request_def()
del request_def.headers['Host']
bad_cases.append(('Missing Host', request_def, None, True))
request_def = _create_good_request_def()
del request_def.headers['Upgrade']
bad_cases.append(('Missing Upgrade', request_def, None, True))
request_def = _create_good_request_def()
request_def.headers['Upgrade'] = 'nonwebsocket'
bad_cases.append(('Wrong Upgrade', request_def, None, True))
request_def = _create_good_request_def()
del request_def.headers['Connection']
bad_cases.append(('Missing Connection', request_def, None, True))
request_def = _create_good_request_def()
request_def.headers['Connection'] = 'Downgrade'
bad_cases.append(('Wrong Connection', request_def, None, True))
request_def = _create_good_request_def()
del request_def.headers['Sec-WebSocket-Key']
bad_cases.append(('Missing Sec-WebSocket-Key', request_def, 400, True))
request_def = _create_good_request_def()
request_def.headers['Sec-WebSocket-Key'] = (
'dGhlIHNhbXBsZSBub25jZQ==garbage')
bad_cases.append(('Wrong Sec-WebSocket-Key (with garbage on the tail)',
request_def, 400, True))
request_def = _create_good_request_def()
request_def.headers['Sec-WebSocket-Key'] = 'YQ==' # BASE64 of 'a'
bad_cases.append(
('Wrong Sec-WebSocket-Key (decoded value is not 16 octets long)',
request_def, 400, True))
request_def = _create_good_request_def()
del request_def.headers['Sec-WebSocket-Version']
bad_cases.append(('Missing Sec-WebSocket-Version', request_def, None,
True))
request_def = _create_good_request_def()
request_def.headers['Sec-WebSocket-Version'] = '3'
bad_cases.append(('Wrong Sec-WebSocket-Version', request_def, None,
False))
for (case_name, request_def, expected_status,
expect_handshake_exception) in bad_cases:
request = _create_request(request_def)
handshaker = Handshaker(request, mock.MockDispatcher())
try:
handshaker.do_handshake()
self.fail('No exception thrown for \'%s\' case' % case_name)
except HandshakeException, e:
self.assertTrue(expect_handshake_exception)
self.assertEqual(expected_status, e.status)
except VersionException, e:
self.assertFalse(expect_handshake_exception)
if __name__ == '__main__':
unittest.main()
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