#!/usr/bin/env python
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"""Tests for dispatch module."""


import os
import unittest

import set_sys_path  # Update sys.path to locate mod_pywebsocket module.

from mod_pywebsocket import dispatch
from mod_pywebsocket import handshake
from test import mock


_TEST_HANDLERS_DIR = os.path.join(
        os.path.split(__file__)[0], 'testdata', 'handlers')

_TEST_HANDLERS_SUB_DIR = os.path.join(_TEST_HANDLERS_DIR, 'sub')


class DispatcherTest(unittest.TestCase):
    """A unittest for dispatch module."""

    def test_normalize_path(self):
        self.assertEqual(os.path.abspath('/a/b').replace('\\', '/'),
                         dispatch._normalize_path('/a/b'))
        self.assertEqual(os.path.abspath('/a/b').replace('\\', '/'),
                         dispatch._normalize_path('\\a\\b'))
        self.assertEqual(os.path.abspath('/a/b').replace('\\', '/'),
                         dispatch._normalize_path('/a/c/../b'))
        self.assertEqual(os.path.abspath('abc').replace('\\', '/'),
                         dispatch._normalize_path('abc'))

    def test_converter(self):
        converter = dispatch._create_path_to_resource_converter('/a/b')
        # Python built by MSC inserts a drive name like 'C:\' via realpath().
        # Converter Generator expands provided path using realpath() and uses
        # the path including a drive name to verify the prefix.
        os_root = os.path.realpath('/')
        self.assertEqual('/h', converter(os_root + 'a/b/h_wsh.py'))
        self.assertEqual('/c/h', converter(os_root + 'a/b/c/h_wsh.py'))
        self.assertEqual(None, converter(os_root + 'a/b/h.py'))
        self.assertEqual(None, converter('a/b/h_wsh.py'))

        converter = dispatch._create_path_to_resource_converter('a/b')
        self.assertEqual('/h', converter(dispatch._normalize_path(
            'a/b/h_wsh.py')))

        converter = dispatch._create_path_to_resource_converter('/a/b///')
        self.assertEqual('/h', converter(os_root + 'a/b/h_wsh.py'))
        self.assertEqual('/h', converter(dispatch._normalize_path(
            '/a/b/../b/h_wsh.py')))

        converter = dispatch._create_path_to_resource_converter(
            '/a/../a/b/../b/')
        self.assertEqual('/h', converter(os_root + 'a/b/h_wsh.py'))

        converter = dispatch._create_path_to_resource_converter(r'\a\b')
        self.assertEqual('/h', converter(os_root + r'a\b\h_wsh.py'))
        self.assertEqual('/h', converter(os_root + r'a/b/h_wsh.py'))

    def test_enumerate_handler_file_paths(self):
        paths = list(
            dispatch._enumerate_handler_file_paths(_TEST_HANDLERS_DIR))
        paths.sort()
        self.assertEqual(8, len(paths))
        expected_paths = [
                os.path.join(_TEST_HANDLERS_DIR, 'abort_by_user_wsh.py'),
                os.path.join(_TEST_HANDLERS_DIR, 'blank_wsh.py'),
                os.path.join(_TEST_HANDLERS_DIR, 'origin_check_wsh.py'),
                os.path.join(_TEST_HANDLERS_DIR, 'sub',
                             'exception_in_transfer_wsh.py'),
                os.path.join(_TEST_HANDLERS_DIR, 'sub', 'non_callable_wsh.py'),
                os.path.join(_TEST_HANDLERS_DIR, 'sub', 'plain_wsh.py'),
                os.path.join(_TEST_HANDLERS_DIR, 'sub',
                             'wrong_handshake_sig_wsh.py'),
                os.path.join(_TEST_HANDLERS_DIR, 'sub',
                             'wrong_transfer_sig_wsh.py'),
                ]
        for expected, actual in zip(expected_paths, paths):
            self.assertEqual(expected, actual)

    def test_source_handler_file(self):
        self.assertRaises(
            dispatch.DispatchException, dispatch._source_handler_file, '')
        self.assertRaises(
            dispatch.DispatchException, dispatch._source_handler_file, 'def')
        self.assertRaises(
            dispatch.DispatchException, dispatch._source_handler_file, '1/0')
        self.failUnless(dispatch._source_handler_file(
                'def web_socket_do_extra_handshake(request):pass\n'
                'def web_socket_transfer_data(request):pass\n'))

    def test_source_warnings(self):
        dispatcher = dispatch.Dispatcher(_TEST_HANDLERS_DIR, None)
        warnings = dispatcher.source_warnings()
        warnings.sort()
        expected_warnings = [
                (os.path.realpath(os.path.join(
                    _TEST_HANDLERS_DIR, 'blank_wsh.py')) +
                 ': web_socket_do_extra_handshake is not defined.'),
                (os.path.realpath(os.path.join(
                    _TEST_HANDLERS_DIR, 'sub', 'non_callable_wsh.py')) +
                 ': web_socket_do_extra_handshake is not callable.'),
                (os.path.realpath(os.path.join(
                    _TEST_HANDLERS_DIR, 'sub', 'wrong_handshake_sig_wsh.py')) +
                 ': web_socket_do_extra_handshake is not defined.'),
                (os.path.realpath(os.path.join(
                    _TEST_HANDLERS_DIR, 'sub', 'wrong_transfer_sig_wsh.py')) +
                 ': web_socket_transfer_data is not defined.'),
                ]
        self.assertEquals(4, len(warnings))
        for expected, actual in zip(expected_warnings, warnings):
            self.assertEquals(expected, actual)

    def test_do_extra_handshake(self):
        dispatcher = dispatch.Dispatcher(_TEST_HANDLERS_DIR, None)
        request = mock.MockRequest()
        request.ws_resource = '/origin_check'
        request.ws_origin = 'http://example.com'
        dispatcher.do_extra_handshake(request)  # Must not raise exception.

        request.ws_origin = 'http://bad.example.com'
        try:
            dispatcher.do_extra_handshake(request)
            self.fail('Could not catch HandshakeException with 403 status')
        except handshake.HandshakeException, e:
            self.assertEquals(403, e.status)
        except Exception, e:
            self.fail('Unexpected exception: %r' % e)

    def test_abort_extra_handshake(self):
        dispatcher = dispatch.Dispatcher(_TEST_HANDLERS_DIR, None)
        request = mock.MockRequest()
        request.ws_resource = '/abort_by_user'
        self.assertRaises(handshake.AbortedByUserException,
                          dispatcher.do_extra_handshake, request)

    def test_transfer_data(self):
        dispatcher = dispatch.Dispatcher(_TEST_HANDLERS_DIR, None)

        request = mock.MockRequest(connection=mock.MockConn('\xff\x00'))
        request.ws_resource = '/origin_check'
        request.ws_protocol = 'p1'
        dispatcher.transfer_data(request)
        self.assertEqual('origin_check_wsh.py is called for /origin_check, p1'
                         '\xff\x00',
                         request.connection.written_data())

        request = mock.MockRequest(connection=mock.MockConn('\xff\x00'))
        request.ws_resource = '/sub/plain'
        request.ws_protocol = None
        dispatcher.transfer_data(request)
        self.assertEqual('sub/plain_wsh.py is called for /sub/plain, None'
                         '\xff\x00',
                         request.connection.written_data())

        request = mock.MockRequest(connection=mock.MockConn('\xff\x00'))
        request.ws_resource = '/sub/plain?'
        request.ws_protocol = None
        dispatcher.transfer_data(request)
        self.assertEqual('sub/plain_wsh.py is called for /sub/plain?, None'
                         '\xff\x00',
                         request.connection.written_data())

        request = mock.MockRequest(connection=mock.MockConn('\xff\x00'))
        request.ws_resource = '/sub/plain?q=v'
        request.ws_protocol = None
        dispatcher.transfer_data(request)
        self.assertEqual('sub/plain_wsh.py is called for /sub/plain?q=v, None'
                         '\xff\x00',
                         request.connection.written_data())

    def test_transfer_data_no_handler(self):
        dispatcher = dispatch.Dispatcher(_TEST_HANDLERS_DIR, None)
        for resource in ['/blank', '/sub/non_callable',
                         '/sub/no_wsh_at_the_end', '/does/not/exist']:
            request = mock.MockRequest(connection=mock.MockConn(''))
            request.ws_resource = resource
            request.ws_protocol = 'p2'
            try:
                dispatcher.transfer_data(request)
                self.fail()
            except dispatch.DispatchException, e:
                self.failUnless(str(e).find('No handler') != -1)
            except Exception:
                self.fail()

    def test_transfer_data_handler_exception(self):
        dispatcher = dispatch.Dispatcher(_TEST_HANDLERS_DIR, None)
        request = mock.MockRequest(connection=mock.MockConn(''))
        request.ws_resource = '/sub/exception_in_transfer'
        request.ws_protocol = 'p3'
        try:
            dispatcher.transfer_data(request)
            self.fail()
        except Exception, e:
            self.failUnless(str(e).find('Intentional') != -1,
                            'Unexpected exception: %s' % e)

    def test_abort_transfer_data(self):
        dispatcher = dispatch.Dispatcher(_TEST_HANDLERS_DIR, None)
        request = mock.MockRequest()
        request.ws_resource = '/abort_by_user'
        self.assertRaises(handshake.AbortedByUserException,
                          dispatcher.transfer_data, request)

    def test_scan_dir(self):
        disp = dispatch.Dispatcher(_TEST_HANDLERS_DIR, None)
        self.assertEqual(4, len(disp._handler_suite_map))
        self.failUnless('/origin_check' in disp._handler_suite_map)
        self.failUnless(
            '/sub/exception_in_transfer' in disp._handler_suite_map)
        self.failUnless('/sub/plain' in disp._handler_suite_map)

    def test_scan_sub_dir(self):
        disp = dispatch.Dispatcher(_TEST_HANDLERS_DIR, _TEST_HANDLERS_SUB_DIR)
        self.assertEqual(2, len(disp._handler_suite_map))
        self.failIf('/origin_check' in disp._handler_suite_map)
        self.failUnless(
            '/sub/exception_in_transfer' in disp._handler_suite_map)
        self.failUnless('/sub/plain' in disp._handler_suite_map)

    def test_scan_sub_dir_as_root(self):
        disp = dispatch.Dispatcher(_TEST_HANDLERS_SUB_DIR,
                                   _TEST_HANDLERS_SUB_DIR)
        self.assertEqual(2, len(disp._handler_suite_map))
        self.failIf('/origin_check' in disp._handler_suite_map)
        self.failIf('/sub/exception_in_transfer' in disp._handler_suite_map)
        self.failIf('/sub/plain' in disp._handler_suite_map)
        self.failUnless('/exception_in_transfer' in disp._handler_suite_map)
        self.failUnless('/plain' in disp._handler_suite_map)

    def test_scan_dir_must_under_root(self):
        dispatch.Dispatcher('a/b', 'a/b/c')  # OK
        dispatch.Dispatcher('a/b///', 'a/b')  # OK
        self.assertRaises(dispatch.DispatchException,
                          dispatch.Dispatcher, 'a/b/c', 'a/b')

    def test_resource_path_alias(self):
        disp = dispatch.Dispatcher(_TEST_HANDLERS_DIR, None)
        disp.add_resource_path_alias('/', '/origin_check')
        self.assertEqual(5, len(disp._handler_suite_map))
        self.failUnless('/origin_check' in disp._handler_suite_map)
        self.failUnless(
            '/sub/exception_in_transfer' in disp._handler_suite_map)
        self.failUnless('/sub/plain' in disp._handler_suite_map)
        self.failUnless('/' in disp._handler_suite_map)
        self.assertRaises(dispatch.DispatchException,
                          disp.add_resource_path_alias, '/alias', '/not-exist')


if __name__ == '__main__':
    unittest.main()


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