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Merge pull request #6790 from matrix-org/rav/msc2260.1 

MSC2260: change the default power level for m.room.aliases events
This commit is contained in:
Richard van der Hoff 2020-01-29 11:53:11 +00:00 committed by GitHub
parent 6b9e1014cf 750d4d7599
commit 281551f720
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GPG Key ID: 4AEE18F83AFDEB23
5 changed files with 112 additions and 18 deletions
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1
changelog.d/6790.feature Normal file
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@ -0,0 +1 @@
Implement updated authorization rules for aliases events, from [MSC2260](https://github.com/matrix-org/matrix-doc/pull/2260).

37
synapse/events/utils.py
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@ -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, v1)
)
h[k1] = v1
continue
raise TypeError("Invalid power_levels value for %s: %r" % (k, v))
return power_levels

7
synapse/handlers/directory.py
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@ -151,7 +151,12 @@ class DirectoryHandler(BaseHandler):
yield self._create_association(room_alias, room_id, servers, creator=user_id)
if send_event:
yield self.send_room_alias_update_event(requester, room_id)
try:
yield self.send_room_alias_update_event(requester, room_id)
except AuthError as e:
# sending the aliases event may fail due to the user not having
# permission in the room; this is permitted.
logger.info("Skipping updating aliases event due to auth error %s", e)
@defer.inlineCallbacks
def delete_association(self, requester, room_alias, send_event=True):

40
synapse/handlers/room.py
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@ -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 (
@ -286,7 +287,16 @@ class RoomCreationHandler(BaseHandler):
except AuthError as e:
logger.warning("Unable to update PLs in old room: %s", e)
logger.info("Setting correct PLs in new room to %s", old_room_pl_state.content)
new_pl_content = copy_power_levels_contents(old_room_pl_state.content)
# pre-msc2260 rooms may not have the right setting for aliases. If no other
# value is set, set it now.
events_default = new_pl_content.get("events_default", 0)
new_pl_content.setdefault("events", {}).setdefault(
EventTypes.Aliases, events_default
)
logger.info("Setting correct PLs in new room to %s", new_pl_content)
yield self.event_creation_handler.create_and_send_nonmember_event(
requester,
{
@ -294,7 +304,7 @@ class RoomCreationHandler(BaseHandler):
"state_key": "",
"room_id": new_room_id,
"sender": requester.user.to_string(),
"content": old_room_pl_state.content,
"content": new_pl_content,
},
ratelimit=False,
)
@ -367,6 +377,15 @@ 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 +394,6 @@ 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 +403,7 @@ 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,
@ -813,6 +821,10 @@ class RoomCreationHandler(BaseHandler):
EventTypes.RoomHistoryVisibility: 100,
EventTypes.CanonicalAlias: 50,
EventTypes.RoomAvatar: 50,
# MSC2260: Allow everybody to send alias events by default
# This will be reudundant on pre-MSC2260 rooms, since the
# aliases event is special-cased.
EventTypes.Aliases: 0,
},
"events_default": 0,
"state_default": 50,

45
tests/events/test_utils.py
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@ -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)