diff options
| -rw-r--r-- | synapse/events/utils.py | 37 | ||||
| -rw-r--r-- | synapse/handlers/room.py | 23 | ||||
| -rw-r--r-- | tests/events/test_utils.py | 45 |
3 files changed, 90 insertions, 15 deletions
diff --git a/synapse/events/utils.py b/synapse/events/utils.py index 07d1c5bcf0..be57c6d9be 100644 --- a/synapse/events/utils.py +++ b/synapse/events/utils.py @@ -12,8 +12,9 @@ # 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. - +import collections import re +from typing import Mapping, Union from six import string_types @@ -422,3 +423,37 @@ class EventClientSerializer(object): return yieldable_gather_results( self.serialize_event, events, time_now=time_now, **kwargs ) + + +def copy_power_levels_contents( + old_power_levels: Mapping[str, Union[int, Mapping[str, int]]] +): + """Copy the content of a power_levels event, unfreezing frozendicts along the way + + Raises: + TypeError if the input does not look like a valid power levels event content + """ + if not isinstance(old_power_levels, collections.Mapping): + raise TypeError("Not a valid power-levels content: %r" % (old_power_levels,)) + + power_levels = {} + for k, v in old_power_levels.items(): + + if isinstance(v, int): + power_levels[k] = v + continue + + if isinstance(v, collections.Mapping): + power_levels[k] = h = {} + for k1, v1 in v.items(): + # we should only have one level of nesting + if not isinstance(v1, int): + raise TypeError( + "Invalid power_levels value for %s.%s: %r" % (k, k1, v) + ) + h[k1] = v1 + continue + + raise TypeError("Invalid power_levels value for %s: %r" % (k, v)) + + return power_levels diff --git a/synapse/handlers/room.py b/synapse/handlers/room.py index a9490782b7..532ee22fa4 100644 --- a/synapse/handlers/room.py +++ b/synapse/handlers/room.py @@ -30,6 +30,7 @@ from twisted.internet import defer from synapse.api.constants import EventTypes, JoinRules, RoomCreationPreset from synapse.api.errors import AuthError, Codes, NotFoundError, StoreError, SynapseError from synapse.api.room_versions import KNOWN_ROOM_VERSIONS, RoomVersion +from synapse.events.utils import copy_power_levels_contents from synapse.http.endpoint import parse_and_validate_server_name from synapse.storage.state import StateFilter from synapse.types import ( @@ -367,6 +368,15 @@ class RoomCreationHandler(BaseHandler): if old_event: initial_state[k] = old_event.content + # deep-copy the power-levels event before we start modifying it + # note that if frozen_dicts are enabled, `power_levels` will be a frozen + # dict so we can't just copy.deepcopy it. + initial_state[ + (EventTypes.PowerLevels, "") + ] = power_levels = copy_power_levels_contents( + initial_state[(EventTypes.PowerLevels, "")] + ) + # Resolve the minimum power level required to send any state event # We will give the upgrading user this power level temporarily (if necessary) such that # they are able to copy all of the state events over, then revert them back to their @@ -375,8 +385,6 @@ class RoomCreationHandler(BaseHandler): # Copy over user power levels now as this will not be possible with >100PL users once # the room has been created - power_levels = initial_state[(EventTypes.PowerLevels, "")] - # Calculate the minimum power level needed to clone the room event_power_levels = power_levels.get("events", {}) state_default = power_levels.get("state_default", 0) @@ -386,16 +394,7 @@ class RoomCreationHandler(BaseHandler): # Raise the requester's power level in the new room if necessary current_power_level = power_levels["users"][user_id] if current_power_level < needed_power_level: - # make sure we copy the event content rather than overwriting it. - # note that if frozen_dicts are enabled, `power_levels` will be a frozen - # dict so we can't just copy.deepcopy it. - - new_power_levels = {k: v for k, v in power_levels.items() if k != "users"} - new_power_levels["users"] = { - k: v for k, v in power_levels.get("users", {}).items() if k != user_id - } - new_power_levels["users"][user_id] = needed_power_level - initial_state[(EventTypes.PowerLevels, "")] = new_power_levels + power_levels["users"][user_id] = needed_power_level yield self._send_events_for_new_room( requester, diff --git a/tests/events/test_utils.py b/tests/events/test_utils.py index 9e3d4d0f47..2b13980dfd 100644 --- a/tests/events/test_utils.py +++ b/tests/events/test_utils.py @@ -15,9 +15,14 @@ from synapse.events import FrozenEvent -from synapse.events.utils import prune_event, serialize_event +from synapse.events.utils import ( + copy_power_levels_contents, + prune_event, + serialize_event, +) +from synapse.util.frozenutils import freeze -from .. import unittest +from tests import unittest def MockEvent(**kwargs): @@ -241,3 +246,39 @@ class SerializeEventTestCase(unittest.TestCase): self.serialize( MockEvent(room_id="!foo:bar", content={"foo": "bar"}), ["room_id", 4] ) + + +class CopyPowerLevelsContentTestCase(unittest.TestCase): + def setUp(self) -> None: + self.test_content = { + "ban": 50, + "events": {"m.room.name": 100, "m.room.power_levels": 100}, + "events_default": 0, + "invite": 50, + "kick": 50, + "notifications": {"room": 20}, + "redact": 50, + "state_default": 50, + "users": {"@example:localhost": 100}, + "users_default": 0, + } + + def _test(self, input): + a = copy_power_levels_contents(input) + + self.assertEqual(a["ban"], 50) + self.assertEqual(a["events"]["m.room.name"], 100) + + # make sure that changing the copy changes the copy and not the orig + a["ban"] = 10 + a["events"]["m.room.power_levels"] = 20 + + self.assertEqual(input["ban"], 50) + self.assertEqual(input["events"]["m.room.power_levels"], 100) + + def test_unfrozen(self): + self._test(self.test_content) + + def test_frozen(self): + input = freeze(self.test_content) + self._test(input) |