590 lines
18 KiB
Python
590 lines
18 KiB
Python
# -*- coding: utf-8 -*-
|
|
# Copyright 2014 OpenMarket 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.
|
|
|
|
"""Contains handlers for federation events."""
|
|
|
|
from ._base import BaseHandler
|
|
|
|
from synapse.api.events.utils import prune_event
|
|
from synapse.api.errors import AuthError, FederationError, SynapseError
|
|
from synapse.api.events.room import RoomMemberEvent
|
|
from synapse.api.constants import Membership
|
|
from synapse.util.logutils import log_function
|
|
from synapse.federation.pdu_codec import PduCodec
|
|
from synapse.util.async import run_on_reactor
|
|
from synapse.crypto.event_signing import (
|
|
compute_event_signature, check_event_content_hash
|
|
)
|
|
from syutil.jsonutil import encode_canonical_json
|
|
|
|
from twisted.internet import defer
|
|
|
|
import logging
|
|
|
|
|
|
logger = logging.getLogger(__name__)
|
|
|
|
|
|
class FederationHandler(BaseHandler):
|
|
"""Handles events that originated from federation.
|
|
Responsible for:
|
|
a) handling received Pdus before handing them on as Events to the rest
|
|
of the home server (including auth and state conflict resoultion)
|
|
b) converting events that were produced by local clients that may need
|
|
to be sent to remote home servers.
|
|
c) doing the necessary dances to invite remote users and join remote
|
|
rooms.
|
|
"""
|
|
|
|
def __init__(self, hs):
|
|
super(FederationHandler, self).__init__(hs)
|
|
|
|
self.distributor.observe(
|
|
"user_joined_room",
|
|
self._on_user_joined
|
|
)
|
|
|
|
self.waiting_for_join_list = {}
|
|
|
|
self.store = hs.get_datastore()
|
|
self.replication_layer = hs.get_replication_layer()
|
|
self.state_handler = hs.get_state_handler()
|
|
# self.auth_handler = gs.get_auth_handler()
|
|
self.server_name = hs.hostname
|
|
self.keyring = hs.get_keyring()
|
|
|
|
self.lock_manager = hs.get_room_lock_manager()
|
|
|
|
self.replication_layer.set_handler(self)
|
|
|
|
self.pdu_codec = PduCodec(hs)
|
|
|
|
# When joining a room we need to queue any events for that room up
|
|
self.room_queues = {}
|
|
|
|
@log_function
|
|
@defer.inlineCallbacks
|
|
def handle_new_event(self, event, snapshot):
|
|
""" Takes in an event from the client to server side, that has already
|
|
been authed and handled by the state module, and sends it to any
|
|
remote home servers that may be interested.
|
|
|
|
Args:
|
|
event
|
|
snapshot (.storage.Snapshot): THe snapshot the event happened after
|
|
|
|
Returns:
|
|
Deferred: Resolved when it has successfully been queued for
|
|
processing.
|
|
"""
|
|
|
|
yield run_on_reactor()
|
|
|
|
pdu = self.pdu_codec.pdu_from_event(event)
|
|
|
|
if not hasattr(pdu, "destinations") or not pdu.destinations:
|
|
pdu.destinations = []
|
|
|
|
yield self.replication_layer.send_pdu(pdu)
|
|
|
|
@log_function
|
|
@defer.inlineCallbacks
|
|
def on_receive_pdu(self, pdu, backfilled, state=None):
|
|
""" Called by the ReplicationLayer when we have a new pdu. We need to
|
|
do auth checks and put it through the StateHandler.
|
|
"""
|
|
event = self.pdu_codec.event_from_pdu(pdu)
|
|
|
|
logger.debug("Got event: %s", event.event_id)
|
|
|
|
# If we are currently in the process of joining this room, then we
|
|
# queue up events for later processing.
|
|
if event.room_id in self.room_queues:
|
|
self.room_queues[event.room_id].append(pdu)
|
|
return
|
|
|
|
logger.debug("Processing event: %s", event.event_id)
|
|
|
|
redacted_event = prune_event(event)
|
|
redacted_event.origin = pdu.origin
|
|
redacted_event.origin_server_ts = pdu.origin_server_ts
|
|
redacted_pdu = self.pdu_codec.pdu_from_event(redacted_event)
|
|
|
|
redacted_pdu_json = redacted_pdu.get_dict()
|
|
try:
|
|
yield self.keyring.verify_json_for_server(
|
|
event.origin, redacted_pdu_json
|
|
)
|
|
except SynapseError as e:
|
|
logger.warn("Signature check failed for %s redacted to %s",
|
|
encode_canonical_json(pdu.get_dict()),
|
|
encode_canonical_json(redacted_pdu_json),
|
|
)
|
|
raise FederationError(
|
|
"ERROR",
|
|
e.code,
|
|
e.msg,
|
|
affected=event.event_id,
|
|
)
|
|
|
|
if not check_event_content_hash(pdu):
|
|
logger.warn(
|
|
"Event content has been tampered, redacting %s", event.event_id
|
|
)
|
|
event = redacted_event
|
|
|
|
if state:
|
|
state = [self.pdu_codec.event_from_pdu(p) for p in state]
|
|
|
|
is_new_state = yield self.state_handler.annotate_event_with_state(
|
|
event,
|
|
old_state=state
|
|
)
|
|
|
|
logger.debug("Event: %s", event)
|
|
|
|
try:
|
|
self.auth.check(event, raises=True)
|
|
except AuthError as e:
|
|
raise FederationError(
|
|
"ERROR",
|
|
e.code,
|
|
e.msg,
|
|
affected=event.event_id,
|
|
)
|
|
|
|
is_new_state = is_new_state and not backfilled
|
|
|
|
# TODO: Implement something in federation that allows us to
|
|
# respond to PDU.
|
|
|
|
yield self.store.persist_event(
|
|
event,
|
|
backfilled,
|
|
is_new_state=is_new_state
|
|
)
|
|
|
|
room = yield self.store.get_room(event.room_id)
|
|
|
|
if not room:
|
|
# Huh, let's try and get the current state
|
|
try:
|
|
yield self.replication_layer.get_state_for_context(
|
|
event.origin, event.room_id, event.event_id,
|
|
)
|
|
|
|
hosts = yield self.store.get_joined_hosts_for_room(
|
|
event.room_id
|
|
)
|
|
if self.hs.hostname in hosts:
|
|
try:
|
|
yield self.store.store_room(
|
|
room_id=event.room_id,
|
|
room_creator_user_id="",
|
|
is_public=False,
|
|
)
|
|
except:
|
|
pass
|
|
except:
|
|
logger.exception(
|
|
"Failed to get current state for room %s",
|
|
event.room_id
|
|
)
|
|
|
|
if not backfilled:
|
|
extra_users = []
|
|
if event.type == RoomMemberEvent.TYPE:
|
|
target_user_id = event.state_key
|
|
target_user = self.hs.parse_userid(target_user_id)
|
|
extra_users.append(target_user)
|
|
|
|
yield self.notifier.on_new_room_event(
|
|
event, extra_users=extra_users
|
|
)
|
|
|
|
if event.type == RoomMemberEvent.TYPE:
|
|
if event.membership == Membership.JOIN:
|
|
user = self.hs.parse_userid(event.state_key)
|
|
self.distributor.fire(
|
|
"user_joined_room", user=user, room_id=event.room_id
|
|
)
|
|
|
|
@log_function
|
|
@defer.inlineCallbacks
|
|
def backfill(self, dest, room_id, limit):
|
|
""" Trigger a backfill request to `dest` for the given `room_id`
|
|
"""
|
|
extremities = yield self.store.get_oldest_events_in_room(room_id)
|
|
|
|
pdus = yield self.replication_layer.backfill(
|
|
dest,
|
|
room_id,
|
|
limit,
|
|
extremities=extremities,
|
|
)
|
|
|
|
events = []
|
|
|
|
for pdu in pdus:
|
|
event = self.pdu_codec.event_from_pdu(pdu)
|
|
|
|
# FIXME (erikj): Not sure this actually works :/
|
|
yield self.state_handler.annotate_event_with_state(event)
|
|
|
|
events.append(event)
|
|
|
|
yield self.store.persist_event(event, backfilled=True)
|
|
|
|
defer.returnValue(events)
|
|
|
|
@defer.inlineCallbacks
|
|
def send_invite(self, target_host, event):
|
|
""" Sends the invite to the remote server for signing.
|
|
|
|
Invites must be signed by the invitee's server before distribution.
|
|
"""
|
|
pdu = yield self.replication_layer.send_invite(
|
|
destination=target_host,
|
|
context=event.room_id,
|
|
event_id=event.event_id,
|
|
pdu=self.pdu_codec.pdu_from_event(event)
|
|
)
|
|
|
|
defer.returnValue(self.pdu_codec.event_from_pdu(pdu))
|
|
|
|
@defer.inlineCallbacks
|
|
def on_event_auth(self, event_id):
|
|
auth = yield self.store.get_auth_chain(event_id)
|
|
defer.returnValue([self.pdu_codec.pdu_from_event(e) for e in auth])
|
|
|
|
@log_function
|
|
@defer.inlineCallbacks
|
|
def do_invite_join(self, target_host, room_id, joinee, content, snapshot):
|
|
""" Attempts to join the `joinee` to the room `room_id` via the
|
|
server `target_host`.
|
|
|
|
This first triggers a /make_join/ request that returns a partial
|
|
event that we can fill out and sign. This is then sent to the
|
|
remote server via /send_join/ which responds with the state at that
|
|
event and the auth_chains.
|
|
|
|
We suspend processing of any received events from this room until we
|
|
have finished processing the join.
|
|
"""
|
|
pdu = yield self.replication_layer.make_join(
|
|
target_host,
|
|
room_id,
|
|
joinee
|
|
)
|
|
|
|
logger.debug("Got response to make_join: %s", pdu)
|
|
|
|
event = self.pdu_codec.event_from_pdu(pdu)
|
|
|
|
# We should assert some things.
|
|
assert(event.type == RoomMemberEvent.TYPE)
|
|
assert(event.user_id == joinee)
|
|
assert(event.state_key == joinee)
|
|
assert(event.room_id == room_id)
|
|
|
|
event.outlier = False
|
|
|
|
self.room_queues[room_id] = []
|
|
|
|
try:
|
|
event.event_id = self.event_factory.create_event_id()
|
|
event.content = content
|
|
|
|
state = yield self.replication_layer.send_join(
|
|
target_host,
|
|
self.pdu_codec.pdu_from_event(event)
|
|
)
|
|
|
|
state = [self.pdu_codec.event_from_pdu(p) for p in state]
|
|
|
|
logger.debug("do_invite_join state: %s", state)
|
|
|
|
yield self.state_handler.annotate_event_with_state(
|
|
event,
|
|
old_state=state
|
|
)
|
|
|
|
logger.debug("do_invite_join event: %s", event)
|
|
|
|
try:
|
|
yield self.store.store_room(
|
|
room_id=room_id,
|
|
room_creator_user_id="",
|
|
is_public=False
|
|
)
|
|
except:
|
|
# FIXME
|
|
pass
|
|
|
|
for e in state:
|
|
# FIXME: Auth these.
|
|
e.outlier = True
|
|
|
|
yield self.state_handler.annotate_event_with_state(
|
|
e,
|
|
)
|
|
|
|
yield self.store.persist_event(
|
|
e,
|
|
backfilled=False,
|
|
is_new_state=True
|
|
)
|
|
|
|
yield self.store.persist_event(
|
|
event,
|
|
backfilled=False,
|
|
is_new_state=True
|
|
)
|
|
finally:
|
|
room_queue = self.room_queues[room_id]
|
|
del self.room_queues[room_id]
|
|
|
|
for p in room_queue:
|
|
try:
|
|
yield self.on_receive_pdu(p, backfilled=False)
|
|
except:
|
|
pass
|
|
|
|
defer.returnValue(True)
|
|
|
|
@defer.inlineCallbacks
|
|
@log_function
|
|
def on_make_join_request(self, context, user_id):
|
|
""" We've received a /make_join/ request, so we create a partial
|
|
join event for the room and return that. We don *not* persist or
|
|
process it until the other server has signed it and sent it back.
|
|
"""
|
|
event = self.event_factory.create_event(
|
|
etype=RoomMemberEvent.TYPE,
|
|
content={"membership": Membership.JOIN},
|
|
room_id=context,
|
|
user_id=user_id,
|
|
state_key=user_id,
|
|
)
|
|
|
|
snapshot = yield self.store.snapshot_room(event)
|
|
snapshot.fill_out_prev_events(event)
|
|
|
|
yield self.state_handler.annotate_event_with_state(event)
|
|
yield self.auth.add_auth_events(event)
|
|
self.auth.check(event, raises=True)
|
|
|
|
pdu = self.pdu_codec.pdu_from_event(event)
|
|
|
|
defer.returnValue(pdu)
|
|
|
|
@defer.inlineCallbacks
|
|
@log_function
|
|
def on_send_join_request(self, origin, pdu):
|
|
""" We have received a join event for a room. Fully process it and
|
|
respond with the current state and auth chains.
|
|
"""
|
|
event = self.pdu_codec.event_from_pdu(pdu)
|
|
|
|
event.outlier = False
|
|
|
|
is_new_state = yield self.state_handler.annotate_event_with_state(event)
|
|
self.auth.check(event, raises=True)
|
|
|
|
# FIXME (erikj): All this is duplicated above :(
|
|
|
|
yield self.store.persist_event(
|
|
event,
|
|
backfilled=False,
|
|
is_new_state=is_new_state
|
|
)
|
|
|
|
extra_users = []
|
|
if event.type == RoomMemberEvent.TYPE:
|
|
target_user_id = event.state_key
|
|
target_user = self.hs.parse_userid(target_user_id)
|
|
extra_users.append(target_user)
|
|
|
|
yield self.notifier.on_new_room_event(
|
|
event, extra_users=extra_users
|
|
)
|
|
|
|
if event.type == RoomMemberEvent.TYPE:
|
|
if event.membership == Membership.JOIN:
|
|
user = self.hs.parse_userid(event.state_key)
|
|
self.distributor.fire(
|
|
"user_joined_room", user=user, room_id=event.room_id
|
|
)
|
|
|
|
new_pdu = self.pdu_codec.pdu_from_event(event)
|
|
|
|
destinations = set()
|
|
|
|
for k, s in event.state_events.items():
|
|
try:
|
|
if k[0] == RoomMemberEvent.TYPE:
|
|
if s.content["membership"] == Membership.JOIN:
|
|
destinations.add(
|
|
self.hs.parse_userid(s.state_key).domain
|
|
)
|
|
except:
|
|
logger.warn(
|
|
"Failed to get destination from event %s", s.event_id
|
|
)
|
|
|
|
new_pdu.destinations = list(destinations)
|
|
|
|
yield self.replication_layer.send_pdu(new_pdu)
|
|
|
|
auth_chain = yield self.store.get_auth_chain(event.event_id)
|
|
pdu_auth_chain = [
|
|
self.pdu_codec.pdu_from_event(e)
|
|
for e in auth_chain
|
|
]
|
|
|
|
defer.returnValue({
|
|
"state": [
|
|
self.pdu_codec.pdu_from_event(e)
|
|
for e in event.state_events.values()
|
|
],
|
|
"auth_chain": pdu_auth_chain,
|
|
})
|
|
|
|
@defer.inlineCallbacks
|
|
def on_invite_request(self, origin, pdu):
|
|
""" We've got an invite event. Process and persist it. Sign it.
|
|
|
|
Respond with the now signed event.
|
|
"""
|
|
event = self.pdu_codec.event_from_pdu(pdu)
|
|
|
|
event.outlier = True
|
|
|
|
event.signatures.update(
|
|
compute_event_signature(
|
|
event,
|
|
self.hs.hostname,
|
|
self.hs.config.signing_key[0]
|
|
)
|
|
)
|
|
|
|
yield self.state_handler.annotate_event_with_state(event)
|
|
|
|
yield self.store.persist_event(
|
|
event,
|
|
backfilled=False,
|
|
)
|
|
|
|
target_user = self.hs.parse_userid(event.state_key)
|
|
yield self.notifier.on_new_room_event(
|
|
event, extra_users=[target_user],
|
|
)
|
|
|
|
defer.returnValue(self.pdu_codec.pdu_from_event(event))
|
|
|
|
@defer.inlineCallbacks
|
|
def get_state_for_pdu(self, origin, room_id, event_id):
|
|
yield run_on_reactor()
|
|
|
|
in_room = yield self.auth.check_host_in_room(room_id, origin)
|
|
if not in_room:
|
|
raise AuthError(403, "Host not in room.")
|
|
|
|
state_groups = yield self.store.get_state_groups(
|
|
[event_id]
|
|
)
|
|
|
|
if state_groups:
|
|
_, state = state_groups.items().pop()
|
|
results = {
|
|
(e.type, e.state_key): e for e in state
|
|
}
|
|
|
|
event = yield self.store.get_event(event_id)
|
|
if hasattr(event, "state_key"):
|
|
# Get previous state
|
|
if hasattr(event, "replaces_state") and event.replaces_state:
|
|
prev_event = yield self.store.get_event(
|
|
event.replaces_state
|
|
)
|
|
results[(event.type, event.state_key)] = prev_event
|
|
else:
|
|
del results[(event.type, event.state_key)]
|
|
|
|
defer.returnValue(
|
|
[
|
|
self.pdu_codec.pdu_from_event(s)
|
|
for s in results.values()
|
|
]
|
|
)
|
|
else:
|
|
defer.returnValue([])
|
|
|
|
@defer.inlineCallbacks
|
|
@log_function
|
|
def on_backfill_request(self, origin, context, pdu_list, limit):
|
|
in_room = yield self.auth.check_host_in_room(context, origin)
|
|
if not in_room:
|
|
raise AuthError(403, "Host not in room.")
|
|
|
|
events = yield self.store.get_backfill_events(
|
|
context,
|
|
pdu_list,
|
|
limit
|
|
)
|
|
|
|
defer.returnValue([
|
|
self.pdu_codec.pdu_from_event(e)
|
|
for e in events
|
|
])
|
|
|
|
@defer.inlineCallbacks
|
|
@log_function
|
|
def get_persisted_pdu(self, origin, event_id):
|
|
""" Get a PDU from the database with given origin and id.
|
|
|
|
Returns:
|
|
Deferred: Results in a `Pdu`.
|
|
"""
|
|
event = yield self.store.get_event(
|
|
event_id,
|
|
allow_none=True,
|
|
)
|
|
|
|
if event:
|
|
in_room = yield self.auth.check_host_in_room(
|
|
event.room_id,
|
|
origin
|
|
)
|
|
if not in_room:
|
|
raise AuthError(403, "Host not in room.")
|
|
|
|
defer.returnValue(self.pdu_codec.pdu_from_event(event))
|
|
else:
|
|
defer.returnValue(None)
|
|
|
|
@log_function
|
|
def get_min_depth_for_context(self, context):
|
|
return self.store.get_min_depth(context)
|
|
|
|
@log_function
|
|
def _on_user_joined(self, user, room_id):
|
|
waiters = self.waiting_for_join_list.get(
|
|
(user.to_string(), room_id),
|
|
[]
|
|
)
|
|
while waiters:
|
|
waiters.pop().callback(None)
|