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Move `maybe_kick_guest_users` out of `BaseHandler` (#10744) 

This is part of my ongoing war against BaseHandler. I've moved kick_guest_users into RoomMemberHandler (since it calls out to that handler anyway), and split maybe_kick_guest_users into the two places it is called.
This commit is contained in:
Richard van der Hoff 2021-09-06 12:17:16 +01:00 committed by GitHub
parent 5e9b382505
commit 56e2a30634
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9 changed files with 125 additions and 85 deletions
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1
changelog.d/10744.misc Normal file
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@ -0,0 +1 @@
Move `kick_guest_users` into `RoomMemberHandler`.

9
synapse/api/constants.py
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@ -201,6 +201,9 @@ class EventContentFields:
# The creator of the room, as used in `m.room.create` events.
ROOM_CREATOR = "creator"
# Used in m.room.guest_access events.
GUEST_ACCESS = "guest_access"
# Used on normal messages to indicate they were historically imported after the fact
MSC2716_HISTORICAL = "org.matrix.msc2716.historical"
# For "insertion" events to indicate what the next chunk ID should be in
@ -235,5 +238,11 @@ class HistoryVisibility:
WORLD_READABLE = "world_readable"
class GuestAccess:
CAN_JOIN = "can_join"
# anything that is not "can_join" is considered "forbidden", but for completeness:
FORBIDDEN = "forbidden"
class ReadReceiptEventFields:
MSC2285_HIDDEN = "org.matrix.msc2285.hidden"

68
synapse/handlers/_base.py
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@ -15,10 +15,7 @@
import logging
from typing import TYPE_CHECKING, Optional
import synapse.types
from synapse.api.constants import EventTypes, Membership
from synapse.api.ratelimiting import Ratelimiter
from synapse.types import UserID
if TYPE_CHECKING:
from synapse.server import HomeServer
@ -115,68 +112,3 @@ class BaseHandler:
burst_count=burst_count,
update=update,
)
async def maybe_kick_guest_users(self, event, context=None):
# Technically this function invalidates current_state by changing it.
# Hopefully this isn't that important to the caller.
if event.type == EventTypes.GuestAccess:
guest_access = event.content.get("guest_access", "forbidden")
if guest_access != "can_join":
if context:
current_state_ids = await context.get_current_state_ids()
current_state_dict = await self.store.get_events(
list(current_state_ids.values())
)
current_state = list(current_state_dict.values())
else:
current_state_map = await self.state_handler.get_current_state(
event.room_id
)
current_state = list(current_state_map.values())
logger.info("maybe_kick_guest_users %r", current_state)
await self.kick_guest_users(current_state)
async def kick_guest_users(self, current_state):
for member_event in current_state:
try:
if member_event.type != EventTypes.Member:
continue
target_user = UserID.from_string(member_event.state_key)
if not self.hs.is_mine(target_user):
continue
if member_event.content["membership"] not in {
Membership.JOIN,
Membership.INVITE,
}:
continue
if (
"kind" not in member_event.content
or member_event.content["kind"] != "guest"
):
continue
# We make the user choose to leave, rather than have the
# event-sender kick them. This is partially because we don't
# need to worry about power levels, and partially because guest
# users are a concept which doesn't hugely work over federation,
# and having homeservers have their own users leave keeps more
# of that decision-making and control local to the guest-having
# homeserver.
requester = synapse.types.create_requester(
target_user, is_guest=True, authenticated_entity=self.server_name
)
handler = self.hs.get_room_member_handler()
await handler.update_membership(
requester,
target_user,
member_event.room_id,
"leave",
ratelimit=False,
require_consent=False,
)
except Exception as e:
logger.exception("Error kicking guest user: %s" % (e,))

17
synapse/handlers/federation_event.py
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@ -36,6 +36,7 @@ from synapse import event_auth
from synapse.api.constants import (
EventContentFields,
EventTypes,
GuestAccess,
Membership,
RejectedReason,
RoomEncryptionAlgorithms,
@ -1327,9 +1328,7 @@ class FederationEventHandler(BaseHandler):
if not context.rejected:
await self._check_for_soft_fail(event, state, backfilled, origin=origin)
if event.type == EventTypes.GuestAccess and not context.rejected:
await self.maybe_kick_guest_users(event)
await self._maybe_kick_guest_users(event)
# If we are going to send this event over federation we precaclculate
# the joined hosts.
@ -1340,6 +1339,18 @@ class FederationEventHandler(BaseHandler):
return context
async def _maybe_kick_guest_users(self, event: EventBase) -> None:
if event.type != EventTypes.GuestAccess:
return
guest_access = event.content.get(EventContentFields.GUEST_ACCESS)
if guest_access == GuestAccess.CAN_JOIN:
return
current_state_map = await self.state_handler.get_current_state(event.room_id)
current_state = list(current_state_map.values())
await self.hs.get_room_member_handler().kick_guest_users(current_state)
async def _check_for_soft_fail(
self,
event: EventBase,

27
synapse/handlers/message.py
View File

@ -27,6 +27,7 @@ from synapse import event_auth
from synapse.api.constants import (
EventContentFields,
EventTypes,
GuestAccess,
Membership,
RelationTypes,
UserTypes,
@ -426,7 +427,7 @@ class EventCreationHandler:
self.send_event = ReplicationSendEventRestServlet.make_client(hs)
# This is only used to get at ratelimit function, and maybe_kick_guest_users
# This is only used to get at ratelimit function
self.base_handler = BaseHandler(hs)
# We arbitrarily limit concurrent event creation for a room to 5.
@ -1306,7 +1307,7 @@ class EventCreationHandler:
requester, is_admin_redaction=is_admin_redaction
)
await self.base_handler.maybe_kick_guest_users(event, context)
await self._maybe_kick_guest_users(event, context)
if event.type == EventTypes.CanonicalAlias:
# Validate a newly added alias or newly added alt_aliases.
@ -1493,6 +1494,28 @@ class EventCreationHandler:
return event
async def _maybe_kick_guest_users(
self, event: EventBase, context: EventContext
) -> None:
if event.type != EventTypes.GuestAccess:
return
guest_access = event.content.get(EventContentFields.GUEST_ACCESS)
if guest_access == GuestAccess.CAN_JOIN:
return
current_state_ids = await context.get_current_state_ids()
# since this is a client-generated event, it cannot be an outlier and we must
# therefore have the state ids.
assert current_state_ids is not None
current_state_dict = await self.store.get_events(
list(current_state_ids.values())
)
current_state = list(current_state_dict.values())
logger.info("maybe_kick_guest_users %r", current_state)
await self.hs.get_room_member_handler().kick_guest_users(current_state)
async def _bump_active_time(self, user: UserID) -> None:
try:
presence = self.hs.get_presence_handler()

5
synapse/handlers/room.py
View File

@ -25,7 +25,9 @@ from collections import OrderedDict
from typing import TYPE_CHECKING, Any, Awaitable, Dict, List, Optional, Tuple
from synapse.api.constants import (
EventContentFields,
EventTypes,
GuestAccess,
HistoryVisibility,
JoinRules,
Membership,
@ -993,7 +995,8 @@ class RoomCreationHandler(BaseHandler):
if config["guest_can_join"]:
if (EventTypes.GuestAccess, "") not in initial_state:
last_sent_stream_id = await send(
etype=EventTypes.GuestAccess, content={"guest_access": "can_join"}
etype=EventTypes.GuestAccess,
content={EventContentFields.GUEST_ACCESS: GuestAccess.CAN_JOIN},
)
for (etype, state_key), content in initial_state.items():

12
synapse/handlers/room_list.py
View File

@ -19,7 +19,13 @@ from typing import TYPE_CHECKING, Optional, Tuple
import msgpack
from unpaddedbase64 import decode_base64, encode_base64
from synapse.api.constants import EventTypes, HistoryVisibility, JoinRules
from synapse.api.constants import (
EventContentFields,
EventTypes,
GuestAccess,
HistoryVisibility,
JoinRules,
)
from synapse.api.errors import (
Codes,
HttpResponseException,
@ -336,8 +342,8 @@ class RoomListHandler(BaseHandler):
guest_event = current_state.get((EventTypes.GuestAccess, ""))
guest = None
if guest_event:
guest = guest_event.content.get("guest_access", None)
result["guest_can_join"] = guest == "can_join"
guest = guest_event.content.get(EventContentFields.GUEST_ACCESS)
result["guest_can_join"] = guest == GuestAccess.CAN_JOIN
avatar_event = current_state.get(("m.room.avatar", ""))
if avatar_event:

65
synapse/handlers/room_member.py
View File

@ -23,6 +23,7 @@ from synapse.api.constants import (
AccountDataTypes,
EventContentFields,
EventTypes,
GuestAccess,
Membership,
)
from synapse.api.errors import (
@ -44,6 +45,7 @@ from synapse.types import (
RoomID,
StateMap,
UserID,
create_requester,
get_domain_from_id,
)
from synapse.util.async_helpers import Linearizer
@ -70,6 +72,7 @@ class RoomMemberHandler(metaclass=abc.ABCMeta):
self.auth = hs.get_auth()
self.state_handler = hs.get_state_handler()
self.config = hs.config
self._server_name = hs.hostname
self.federation_handler = hs.get_federation_handler()
self.directory_handler = hs.get_directory_handler()
@ -115,9 +118,8 @@ class RoomMemberHandler(metaclass=abc.ABCMeta):
burst_count=hs.config.ratelimiting.rc_invites_per_user.burst_count,
)
# This is only used to get at ratelimit function, and
# maybe_kick_guest_users. It's fine there are multiple of these as
# it doesn't store state.
# This is only used to get at the ratelimit function. It's fine there are
# multiple of these as it doesn't store state.
self.base_handler = BaseHandler(hs)
@abc.abstractmethod
@ -1095,10 +1097,62 @@ class RoomMemberHandler(metaclass=abc.ABCMeta):
return bool(
guest_access
and guest_access.content
and "guest_access" in guest_access.content
and guest_access.content["guest_access"] == "can_join"
and guest_access.content.get(EventContentFields.GUEST_ACCESS)
== GuestAccess.CAN_JOIN
)
async def kick_guest_users(self, current_state: Iterable[EventBase]) -> None:
"""Kick any local guest users from the room.
This is called when the room state changes from guests allowed to not-allowed.
Params:
current_state: the current state of the room. We will iterate this to look
for guest users to kick.
"""
for member_event in current_state:
try:
if member_event.type != EventTypes.Member:
continue
if not self.hs.is_mine_id(member_event.state_key):
continue
if member_event.content["membership"] not in {
Membership.JOIN,
Membership.INVITE,
}:
continue
if (
"kind" not in member_event.content
or member_event.content["kind"] != "guest"
):
continue
# We make the user choose to leave, rather than have the
# event-sender kick them. This is partially because we don't
# need to worry about power levels, and partially because guest
# users are a concept which doesn't hugely work over federation,
# and having homeservers have their own users leave keeps more
# of that decision-making and control local to the guest-having
# homeserver.
target_user = UserID.from_string(member_event.state_key)
requester = create_requester(
target_user, is_guest=True, authenticated_entity=self._server_name
)
handler = self.hs.get_room_member_handler()
await handler.update_membership(
requester,
target_user,
member_event.room_id,
"leave",
ratelimit=False,
require_consent=False,
)
except Exception as e:
logger.exception("Error kicking guest user: %s" % (e,))
async def lookup_room_alias(
self, room_alias: RoomAlias
) -> Tuple[RoomID, List[str]]:
@ -1352,7 +1406,6 @@ class RoomMemberMasterHandler(RoomMemberHandler):
self.distributor = hs.get_distributor()
self.distributor.declare("user_left_room")
self._server_name = hs.hostname
async def _is_remote_room_too_complex(
self, room_id: str, remote_room_hosts: List[str]

6
synapse/handlers/stats.py
View File

@ -18,7 +18,7 @@ from typing import TYPE_CHECKING, Any, Dict, Iterable, Optional, Tuple
from typing_extensions import Counter as CounterType
from synapse.api.constants import EventTypes, Membership
from synapse.api.constants import EventContentFields, EventTypes, Membership
from synapse.metrics import event_processing_positions
from synapse.metrics.background_process_metrics import run_as_background_process
from synapse.types import JsonDict
@ -273,7 +273,9 @@ class StatsHandler:
elif typ == EventTypes.CanonicalAlias:
room_state["canonical_alias"] = event_content.get("alias")
elif typ == EventTypes.GuestAccess:
room_state["guest_access"] = event_content.get("guest_access")
room_state["guest_access"] = event_content.get(
EventContentFields.GUEST_ACCESS
)
for room_id, state in room_to_state_updates.items():
logger.debug("Updating room_stats_state for %s: %s", room_id, state)