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launchpadlib
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tests
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test_http.py
# Copyright 2010 Canonical Ltd. # This file is part of launchpadlib. # # launchpadlib is free software: you can redistribute it and/or modify it # under the terms of the GNU Lesser General Public License as published by the # Free Software Foundation, version 3 of the License. # # launchpadlib is distributed in the hope that it will be useful, but WITHOUT # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or # FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License # for more details. # # You should have received a copy of the GNU Lesser General Public License # along with launchpadlib. If not, see <http://www.gnu.org/licenses/>. """Tests for the LaunchpadOAuthAwareHTTP class.""" from collections import deque from json import dumps import tempfile import unittest try: from json import JSONDecodeError except ImportError: JSONDecodeError = ValueError from launchpadlib.errors import Unauthorized from launchpadlib.credentials import UnencryptedFileCredentialStore from launchpadlib.launchpad import ( Launchpad, LaunchpadOAuthAwareHttp, ) from launchpadlib.testing.helpers import NoNetworkAuthorizationEngine # The simplest WADL that looks like a representation of the service root. SIMPLE_WADL = b"""<?xml version="1.0"?> <application xmlns="http://research.sun.com/wadl/2006/10"> <resources base="http://www.example.com/"> <resource path="" type="#service-root"/> </resources> <resource_type id="service-root"> <method name="GET" id="service-root-get"> <response> <representation href="#service-root-json"/> </response> </method> </resource_type> <representation id="service-root-json" mediaType="application/json"/> </application> """ # The simplest JSON that looks like a representation of the service root. SIMPLE_JSON = dumps({}).encode("utf-8") class Response: """A fake HTTP response object.""" def __init__(self, status, content): self.status = status self.content = content class SimulatedResponsesHttp(LaunchpadOAuthAwareHttp): """Responds to HTTP requests by shifting responses off a stack.""" def __init__(self, responses, *args): """Constructor. :param responses: A list of HttpResponse objects to use in response to requests. """ super(SimulatedResponsesHttp, self).__init__(*args) self.sent_responses = [] self.unsent_responses = responses self.cache = None def _request(self, *args): response = self.unsent_responses.popleft() self.sent_responses.append(response) return self.retry_on_bad_token(response, response.content, *args) class SimulatedResponsesLaunchpad(Launchpad): # Every Http object generated by this class will return these # responses, in order. responses = [] def httpFactory(self, *args): return SimulatedResponsesHttp( deque(self.responses), self, self.authorization_engine, *args ) @classmethod def credential_store_factory(cls, credential_save_failed): return UnencryptedFileCredentialStore( tempfile.mkstemp()[1], credential_save_failed ) class SimulatedResponsesTestCase(unittest.TestCase): """Test cases that give fake responses to launchpad's HTTP requests.""" def setUp(self): """Clear out the list of simulated responses.""" SimulatedResponsesLaunchpad.responses = [] self.engine = NoNetworkAuthorizationEngine( "http://api.example.com/", "application name" ) def launchpad_with_responses(self, *responses): """Use simulated HTTP responses to get a Launchpad object. The given Response objects will be sent, in order, in response to launchpadlib's requests. :param responses: Some number of Response objects. :return: The Launchpad object, assuming that errors in the simulated requests didn't prevent one from being created. """ SimulatedResponsesLaunchpad.responses = responses return SimulatedResponsesLaunchpad.login_with( "application name", authorization_engine=self.engine ) class TestAbilityToParseData(SimulatedResponsesTestCase): """Test launchpadlib's ability to handle the sample data. To create a Launchpad object, two HTTP requests must succeed and return usable data: the requests for the WADL and JSON representations of the service root. This test shows that the minimal data in SIMPLE_WADL and SIMPLE_JSON is good enough to create a Launchpad object. """ def test_minimal_data(self): """Make sure that launchpadlib can use the minimal data.""" self.launchpad_with_responses( Response(200, SIMPLE_WADL), Response(200, SIMPLE_JSON) ) def test_bad_wadl(self): """Show that bad WADL causes an exception.""" self.assertRaises( SyntaxError, self.launchpad_with_responses, Response(200, b"This is not WADL."), Response(200, SIMPLE_JSON), ) def test_bad_json(self): """Show that bad JSON causes an exception.""" self.assertRaises( JSONDecodeError, self.launchpad_with_responses, Response(200, SIMPLE_WADL), Response(200, b"This is not JSON."), ) class TestTokenFailureDuringRequest(SimulatedResponsesTestCase): """Test access token failures during a request. launchpadlib makes two HTTP requests on startup, to get the WADL and JSON representations of the service root. If Launchpad receives a 401 error during this process, it will acquire a fresh access token and try again. """ def test_good_token(self): """If our token is good, we never get another one.""" SimulatedResponsesLaunchpad.responses = [ Response(200, SIMPLE_WADL), Response(200, SIMPLE_JSON), ] self.assertEqual(self.engine.access_tokens_obtained, 0) SimulatedResponsesLaunchpad.login_with( "application name", authorization_engine=self.engine ) self.assertEqual(self.engine.access_tokens_obtained, 1) def test_bad_token(self): """If our token is bad, we get another one.""" SimulatedResponsesLaunchpad.responses = [ Response(401, b"Invalid token."), Response(200, SIMPLE_WADL), Response(200, SIMPLE_JSON), ] self.assertEqual(self.engine.access_tokens_obtained, 0) SimulatedResponsesLaunchpad.login_with( "application name", authorization_engine=self.engine ) self.assertEqual(self.engine.access_tokens_obtained, 2) def test_expired_token(self): """If our token is expired, we get another one.""" SimulatedResponsesLaunchpad.responses = [ Response(401, b"Expired token."), Response(200, SIMPLE_WADL), Response(200, SIMPLE_JSON), ] self.assertEqual(self.engine.access_tokens_obtained, 0) SimulatedResponsesLaunchpad.login_with( "application name", authorization_engine=self.engine ) self.assertEqual(self.engine.access_tokens_obtained, 2) def test_unknown_token(self): """If our token is unknown, we get another one.""" SimulatedResponsesLaunchpad.responses = [ Response(401, b"Unknown access token."), Response(200, SIMPLE_WADL), Response(200, SIMPLE_JSON), ] self.assertEqual(self.engine.access_tokens_obtained, 0) SimulatedResponsesLaunchpad.login_with( "application name", authorization_engine=self.engine ) self.assertEqual(self.engine.access_tokens_obtained, 2) def test_delayed_error(self): """We get another token no matter when the error happens.""" SimulatedResponsesLaunchpad.responses = [ Response(200, SIMPLE_WADL), Response(401, b"Expired token."), Response(200, SIMPLE_JSON), ] self.assertEqual(self.engine.access_tokens_obtained, 0) SimulatedResponsesLaunchpad.login_with( "application name", authorization_engine=self.engine ) self.assertEqual(self.engine.access_tokens_obtained, 2) def test_many_errors(self): """We'll keep getting new tokens as long as tokens are the problem.""" SimulatedResponsesLaunchpad.responses = [ Response(401, b"Invalid token."), Response(200, SIMPLE_WADL), Response(401, b"Expired token."), Response(401, b"Invalid token."), Response(200, SIMPLE_JSON), ] self.assertEqual(self.engine.access_tokens_obtained, 0) SimulatedResponsesLaunchpad.login_with( "application name", authorization_engine=self.engine ) self.assertEqual(self.engine.access_tokens_obtained, 4) def test_other_unauthorized(self): """If the token is not at fault, a 401 error raises an exception.""" SimulatedResponsesLaunchpad.responses = [ Response(401, b"Some other error.") ] self.assertRaises( Unauthorized, SimulatedResponsesLaunchpad.login_with, "application name", authorization_engine=self.engine, )
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