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  • # -*- coding: utf-8 -*-
    # Copyright 2019 New Vector Ltd
    #
    # Licensed under the Apache License, Version 2.0 (the "License");
    # you may not use this file except in compliance with the License.
    # You may obtain a copy of the License at
    #
    #     http://www.apache.org/licenses/LICENSE-2.0
    #
    # Unless required by applicable law or agreed to in writing, software
    # distributed under the License is distributed on an "AS IS" BASIS,
    # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    # See the License for the specific language governing permissions and
    # limitations under the License.
    from mock import Mock
    
    from synapse.api.constants import EventTypes
    from synapse.rest import admin
    from synapse.rest.client.v1 import login, room
    from synapse.visibility import filter_events_for_client
    
    from tests import unittest
    
    one_hour_ms = 3600000
    one_day_ms = one_hour_ms * 24
    
    
    class RetentionTestCase(unittest.HomeserverTestCase):
        servlets = [
            admin.register_servlets,
            login.register_servlets,
            room.register_servlets,
        ]
    
        def make_homeserver(self, reactor, clock):
            config = self.default_config()
            config["retention"] = {
                "enabled": True,
                "default_policy": {
                    "min_lifetime": one_day_ms,
                    "max_lifetime": one_day_ms * 3,
                },
                "allowed_lifetime_min": one_day_ms,
                "allowed_lifetime_max": one_day_ms * 3,
            }
    
            self.hs = self.setup_test_homeserver(config=config)
            return self.hs
    
        def prepare(self, reactor, clock, homeserver):
            self.user_id = self.register_user("user", "password")
            self.token = self.login("user", "password")
    
        def test_retention_state_event(self):
            """Tests that the server configuration can limit the values a user can set to the
            room's retention policy.
            """
            room_id = self.helper.create_room_as(self.user_id, tok=self.token)
    
            self.helper.send_state(
                room_id=room_id,
                event_type=EventTypes.Retention,
    
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                body={"max_lifetime": one_day_ms * 4},
    
                tok=self.token,
                expect_code=400,
            )
    
            self.helper.send_state(
                room_id=room_id,
                event_type=EventTypes.Retention,
    
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                body={"max_lifetime": one_hour_ms},
    
                tok=self.token,
                expect_code=400,
            )
    
        def test_retention_event_purged_with_state_event(self):
            """Tests that expired events are correctly purged when the room's retention policy
            is defined by a state event.
            """
            room_id = self.helper.create_room_as(self.user_id, tok=self.token)
    
            # Set the room's retention period to 2 days.
            lifetime = one_day_ms * 2
            self.helper.send_state(
                room_id=room_id,
                event_type=EventTypes.Retention,
    
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                body={"max_lifetime": lifetime},
    
                tok=self.token,
            )
    
            self._test_retention_event_purged(room_id, one_day_ms * 1.5)
    
        def test_retention_event_purged_without_state_event(self):
            """Tests that expired events are correctly purged when the room's retention policy
            is defined by the server's configuration's default retention policy.
            """
            room_id = self.helper.create_room_as(self.user_id, tok=self.token)
    
            self._test_retention_event_purged(room_id, one_day_ms * 2)
    
        def test_visibility(self):
            """Tests that synapse.visibility.filter_events_for_client correctly filters out
            outdated events
            """
            store = self.hs.get_datastore()
            storage = self.hs.get_storage()
            room_id = self.helper.create_room_as(self.user_id, tok=self.token)
            events = []
    
            # Send a first event, which should be filtered out at the end of the test.
    
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            resp = self.helper.send(room_id=room_id, body="1", tok=self.token)
    
    
            # Get the event from the store so that we end up with a FrozenEvent that we can
            # give to filter_events_for_client. We need to do this now because the event won't
            # be in the database anymore after it has expired.
    
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            events.append(self.get_success(store.get_event(resp.get("event_id"))))
    
    
            # Advance the time by 2 days. We're using the default retention policy, therefore
            # after this the first event will still be valid.
            self.reactor.advance(one_day_ms * 2 / 1000)
    
            # Send another event, which shouldn't get filtered out.
    
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            resp = self.helper.send(room_id=room_id, body="2", tok=self.token)
    
    
            valid_event_id = resp.get("event_id")
    
    
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            events.append(self.get_success(store.get_event(valid_event_id)))
    
    
            # Advance the time by anothe 2 days. After this, the first event should be
            # outdated but not the second one.
            self.reactor.advance(one_day_ms * 2 / 1000)
    
            # Run filter_events_for_client with our list of FrozenEvents.
    
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            filtered_events = self.get_success(
                filter_events_for_client(storage, self.user_id, events)
            )
    
    
            # We should only get one event back.
            self.assertEqual(len(filtered_events), 1, filtered_events)
            # That event should be the second, not outdated event.
            self.assertEqual(filtered_events[0].event_id, valid_event_id, filtered_events)
    
        def _test_retention_event_purged(self, room_id, increment):
    
            # Get the create event to, later, check that we can still access it.
            message_handler = self.hs.get_message_handler()
            create_event = self.get_success(
                message_handler.get_room_data(self.user_id, room_id, EventTypes.Create)
            )
    
    
            # Send a first event to the room. This is the event we'll want to be purged at the
            # end of the test.
    
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            resp = self.helper.send(room_id=room_id, body="1", tok=self.token)
    
    
            expired_event_id = resp.get("event_id")
    
            # Check that we can retrieve the event.
            expired_event = self.get_event(room_id, expired_event_id)
    
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            self.assertEqual(
                expired_event.get("content", {}).get("body"), "1", expired_event
            )
    
    
            # Advance the time.
            self.reactor.advance(increment / 1000)
    
            # Send another event. We need this because the purge job won't purge the most
            # recent event in the room.
    
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            resp = self.helper.send(room_id=room_id, body="2", tok=self.token)
    
    
            valid_event_id = resp.get("event_id")
    
            # Advance the time again. Now our first event should have expired but our second
            # one should still be kept.
            self.reactor.advance(increment / 1000)
    
            # Check that the event has been purged from the database.
            self.get_event(room_id, expired_event_id, expected_code=404)
    
            # Check that the event that hasn't been purged can still be retrieved.
            valid_event = self.get_event(room_id, valid_event_id)
            self.assertEqual(valid_event.get("content", {}).get("body"), "2", valid_event)
    
    
            # Check that we can still access state events that were sent before the event that
            # has been purged.
            self.get_event(room_id, create_event.event_id)
    
    
        def get_event(self, room_id, event_id, expected_code=200):
            url = "/_matrix/client/r0/rooms/%s/event/%s" % (room_id, event_id)
    
            request, channel = self.make_request("GET", url, access_token=self.token)
            self.render(request)
    
            self.assertEqual(channel.code, expected_code, channel.result)
    
            return channel.json_body
    
    
    class RetentionNoDefaultPolicyTestCase(unittest.HomeserverTestCase):
        servlets = [
            admin.register_servlets,
            login.register_servlets,
            room.register_servlets,
        ]
    
        def make_homeserver(self, reactor, clock):
            config = self.default_config()
            config["retention"] = {
                "enabled": True,
            }
    
            mock_federation_client = Mock(spec=["backfill"])
    
            self.hs = self.setup_test_homeserver(
    
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                config=config, federation_client=mock_federation_client,
    
            )
            return self.hs
    
        def prepare(self, reactor, clock, homeserver):
            self.user_id = self.register_user("user", "password")
            self.token = self.login("user", "password")
    
        def test_no_default_policy(self):
            """Tests that an event doesn't get expired if there is neither a default retention
            policy nor a policy specific to the room.
            """
            room_id = self.helper.create_room_as(self.user_id, tok=self.token)
    
            self._test_retention(room_id)
    
        def test_state_policy(self):
            """Tests that an event gets correctly expired if there is no default retention
            policy but there's a policy specific to the room.
            """
            room_id = self.helper.create_room_as(self.user_id, tok=self.token)
    
            # Set the maximum lifetime to 35 days so that the first event gets expired but not
            # the second one.
            self.helper.send_state(
                room_id=room_id,
                event_type=EventTypes.Retention,
    
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                body={"max_lifetime": one_day_ms * 35},
    
                tok=self.token,
            )
    
            self._test_retention(room_id, expected_code_for_first_event=404)
    
        def _test_retention(self, room_id, expected_code_for_first_event=200):
            # Send a first event to the room. This is the event we'll want to be purged at the
            # end of the test.
    
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            resp = self.helper.send(room_id=room_id, body="1", tok=self.token)
    
    
            first_event_id = resp.get("event_id")
    
            # Check that we can retrieve the event.
            expired_event = self.get_event(room_id, first_event_id)
    
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            self.assertEqual(
                expired_event.get("content", {}).get("body"), "1", expired_event
            )
    
    
            # Advance the time by a month.
            self.reactor.advance(one_day_ms * 30 / 1000)
    
            # Send another event. We need this because the purge job won't purge the most
            # recent event in the room.
    
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            resp = self.helper.send(room_id=room_id, body="2", tok=self.token)
    
    
            second_event_id = resp.get("event_id")
    
            # Advance the time by another month.
            self.reactor.advance(one_day_ms * 30 / 1000)
    
            # Check if the event has been purged from the database.
            first_event = self.get_event(
                room_id, first_event_id, expected_code=expected_code_for_first_event
            )
    
            if expected_code_for_first_event == 200:
    
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                self.assertEqual(
                    first_event.get("content", {}).get("body"), "1", first_event
                )
    
    
            # Check that the event that hasn't been purged can still be retrieved.
            second_event = self.get_event(room_id, second_event_id)
            self.assertEqual(second_event.get("content", {}).get("body"), "2", second_event)
    
        def get_event(self, room_id, event_id, expected_code=200):
            url = "/_matrix/client/r0/rooms/%s/event/%s" % (room_id, event_id)
    
            request, channel = self.make_request("GET", url, access_token=self.token)
            self.render(request)
    
            self.assertEqual(channel.code, expected_code, channel.result)
    
            return channel.json_body