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+# -*- coding: utf-8 -*-
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+# Copyright 2019 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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+
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+from synapse.rest import admin
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+from synapse.rest.client.v1 import login, room
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+from synapse.rest.client.v2_alpha import sync
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+
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+from tests.unittest import HomeserverTestCase
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+
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+
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+class RedactionsTestCase(HomeserverTestCase):
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+ """Tests that various redaction events are handled correctly"""
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+
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+ servlets = [
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+ admin.register_servlets,
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+ room.register_servlets,
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+ login.register_servlets,
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+ sync.register_servlets,
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+ ]
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+
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+ def prepare(self, reactor, clock, hs):
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+ # register a couple of users
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+ self.mod_user_id = self.register_user("user1", "pass")
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+ self.mod_access_token = self.login("user1", "pass")
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+ self.other_user_id = self.register_user("otheruser", "pass")
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+ self.other_access_token = self.login("otheruser", "pass")
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+
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+ # Create a room
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+ self.room_id = self.helper.create_room_as(
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+ self.mod_user_id, tok=self.mod_access_token
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+ )
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+
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+ # Invite the other user
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+ self.helper.invite(
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+ room=self.room_id,
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+ src=self.mod_user_id,
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+ tok=self.mod_access_token,
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+ targ=self.other_user_id,
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+ )
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+ # The other user joins
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+ self.helper.join(
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+ room=self.room_id, user=self.other_user_id, tok=self.other_access_token
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+ )
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+
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+ def _redact_event(self, access_token, room_id, event_id, expect_code=200):
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+ """Helper function to send a redaction event.
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+
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+ Returns the json body.
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+ """
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+ path = "/_matrix/client/r0/rooms/%s/redact/%s" % (room_id, event_id)
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+
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+ request, channel = self.make_request(
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+ "POST", path, content={}, access_token=access_token
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+ )
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+ self.render(request)
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+ self.assertEqual(int(channel.result["code"]), expect_code)
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+ return channel.json_body
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+
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+ def _sync_room_timeline(self, access_token, room_id):
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+ request, channel = self.make_request(
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+ "GET", "sync", access_token=self.mod_access_token
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+ )
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+ self.render(request)
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+ self.assertEqual(channel.result["code"], b"200")
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+ room_sync = channel.json_body["rooms"]["join"][room_id]
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+ return room_sync["timeline"]["events"]
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+
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+ def test_redact_event_as_moderator(self):
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+ # as a regular user, send a message to redact
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+ b = self.helper.send(room_id=self.room_id, tok=self.other_access_token)
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+ msg_id = b["event_id"]
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+
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+ # as the moderator, send a redaction
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+ b = self._redact_event(self.mod_access_token, self.room_id, msg_id)
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+ redaction_id = b["event_id"]
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+
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+ # now sync
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+ timeline = self._sync_room_timeline(self.mod_access_token, self.room_id)
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+
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+ # the last event should be the redaction
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+ self.assertEqual(timeline[-1]["event_id"], redaction_id)
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+ self.assertEqual(timeline[-1]["redacts"], msg_id)
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+
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+ # and the penultimate should be the redacted original
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+ self.assertEqual(timeline[-2]["event_id"], msg_id)
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+ self.assertEqual(timeline[-2]["unsigned"]["redacted_by"], redaction_id)
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+ self.assertEqual(timeline[-2]["content"], {})
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+
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+ def test_redact_event_as_normal(self):
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+ # as a regular user, send a message to redact
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+ b = self.helper.send(room_id=self.room_id, tok=self.other_access_token)
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+ normal_msg_id = b["event_id"]
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+
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+ # also send one as the admin
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+ b = self.helper.send(room_id=self.room_id, tok=self.mod_access_token)
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+ admin_msg_id = b["event_id"]
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+
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+ # as a normal, try to redact the admin's event
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+ self._redact_event(
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+ self.other_access_token, self.room_id, admin_msg_id, expect_code=403
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+ )
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+
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+ # now try to redact our own event
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+ b = self._redact_event(self.other_access_token, self.room_id, normal_msg_id)
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+ redaction_id = b["event_id"]
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+
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+ # now sync
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+ timeline = self._sync_room_timeline(self.other_access_token, self.room_id)
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+
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+ # the last event should be the redaction of the normal event
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+ self.assertEqual(timeline[-1]["event_id"], redaction_id)
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+ self.assertEqual(timeline[-1]["redacts"], normal_msg_id)
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+
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+ # the penultimate should be the unredacted one from the admin
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+ self.assertEqual(timeline[-2]["event_id"], admin_msg_id)
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+ self.assertNotIn("redacted_by", timeline[-2]["unsigned"])
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+ self.assertTrue(timeline[-2]["content"]["body"], {})
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+
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+ # and the antepenultimate should be the redacted normal
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+ self.assertEqual(timeline[-3]["event_id"], normal_msg_id)
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+ self.assertEqual(timeline[-3]["unsigned"]["redacted_by"], redaction_id)
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+ self.assertEqual(timeline[-3]["content"], {})
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+
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+ def test_redact_nonexistent_event(self):
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+ # control case: an existing event
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+ b = self.helper.send(room_id=self.room_id, tok=self.other_access_token)
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+ msg_id = b["event_id"]
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+ b = self._redact_event(self.other_access_token, self.room_id, msg_id)
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+ redaction_id = b["event_id"]
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+
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+ # room moderators can send redactions for non-existent events
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+ self._redact_event(self.mod_access_token, self.room_id, "$zzz")
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+
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+ # ... but normals cannot
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+ self._redact_event(
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+ self.other_access_token, self.room_id, "$zzz", expect_code=404
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+ )
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+
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+ # when we sync, we should see only the valid redaction
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+ timeline = self._sync_room_timeline(self.other_access_token, self.room_id)
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+ self.assertEqual(timeline[-1]["event_id"], redaction_id)
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+ self.assertEqual(timeline[-1]["redacts"], msg_id)
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+
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+ # and the penultimate should be the redacted original
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+ self.assertEqual(timeline[-2]["event_id"], msg_id)
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+ self.assertEqual(timeline[-2]["unsigned"]["redacted_by"], redaction_id)
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+ self.assertEqual(timeline[-2]["content"], {})
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