122 lines
4.1 KiB
Python
122 lines
4.1 KiB
Python
# Copyright 2021 The Matrix.org Foundation C.I.C.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from io import BytesIO
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from mock import Mock
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from twisted.python.failure import Failure
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from twisted.web.client import ResponseDone
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from twisted.web.iweb import UNKNOWN_LENGTH
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from synapse.http.client import BodyExceededMaxSize, read_body_with_max_size
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from tests.unittest import TestCase
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class ReadBodyWithMaxSizeTests(TestCase):
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def _build_response(self, length=UNKNOWN_LENGTH):
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"""Start reading the body, returns the response, result and proto"""
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response = Mock(length=length)
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result = BytesIO()
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deferred = read_body_with_max_size(response, result, 6)
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# Fish the protocol out of the response.
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protocol = response.deliverBody.call_args[0][0]
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protocol.transport = Mock()
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return result, deferred, protocol
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def _assert_error(self, deferred, protocol):
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"""Ensure that the expected error is received."""
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self.assertIsInstance(deferred.result, Failure)
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self.assertIsInstance(deferred.result.value, BodyExceededMaxSize)
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protocol.transport.abortConnection.assert_called_once()
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def _cleanup_error(self, deferred):
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"""Ensure that the error in the Deferred is handled gracefully."""
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called = [False]
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def errback(f):
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called[0] = True
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deferred.addErrback(errback)
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self.assertTrue(called[0])
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def test_no_error(self):
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"""A response that is NOT too large."""
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result, deferred, protocol = self._build_response()
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# Start sending data.
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protocol.dataReceived(b"12345")
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# Close the connection.
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protocol.connectionLost(Failure(ResponseDone()))
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self.assertEqual(result.getvalue(), b"12345")
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self.assertEqual(deferred.result, 5)
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def test_too_large(self):
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"""A response which is too large raises an exception."""
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result, deferred, protocol = self._build_response()
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# Start sending data.
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protocol.dataReceived(b"1234567890")
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self.assertEqual(result.getvalue(), b"1234567890")
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self._assert_error(deferred, protocol)
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self._cleanup_error(deferred)
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def test_multiple_packets(self):
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"""Data should be accumulated through mutliple packets."""
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result, deferred, protocol = self._build_response()
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# Start sending data.
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protocol.dataReceived(b"12")
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protocol.dataReceived(b"34")
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# Close the connection.
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protocol.connectionLost(Failure(ResponseDone()))
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self.assertEqual(result.getvalue(), b"1234")
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self.assertEqual(deferred.result, 4)
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def test_additional_data(self):
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"""A connection can receive data after being closed."""
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result, deferred, protocol = self._build_response()
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# Start sending data.
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protocol.dataReceived(b"1234567890")
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self._assert_error(deferred, protocol)
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# More data might have come in.
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protocol.dataReceived(b"1234567890")
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self.assertEqual(result.getvalue(), b"1234567890")
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self._assert_error(deferred, protocol)
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self._cleanup_error(deferred)
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def test_content_length(self):
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"""The body shouldn't be read (at all) if the Content-Length header is too large."""
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result, deferred, protocol = self._build_response(length=10)
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# Deferred shouldn't be called yet.
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self.assertFalse(deferred.called)
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# Start sending data.
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protocol.dataReceived(b"12345")
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self._assert_error(deferred, protocol)
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self._cleanup_error(deferred)
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# The data is never consumed.
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self.assertEqual(result.getvalue(), b"")
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