1075 lines
35 KiB
Python
1075 lines
35 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014, 2015 OpenMarket Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Contains handlers for federation events."""
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from ._base import BaseHandler
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from synapse.api.errors import (
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AuthError, FederationError, StoreError,
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)
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from synapse.api.constants import EventTypes, Membership, RejectedReason
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from synapse.util.logutils import log_function
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from synapse.util.async import run_on_reactor
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from synapse.crypto.event_signing import (
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compute_event_signature, add_hashes_and_signatures,
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)
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from synapse.types import UserID
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from twisted.internet import defer
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import itertools
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import logging
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logger = logging.getLogger(__name__)
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class FederationHandler(BaseHandler):
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"""Handles events that originated from federation.
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Responsible for:
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a) handling received Pdus before handing them on as Events to the rest
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of the home server (including auth and state conflict resoultion)
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b) converting events that were produced by local clients that may need
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to be sent to remote home servers.
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c) doing the necessary dances to invite remote users and join remote
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rooms.
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"""
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def __init__(self, hs):
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super(FederationHandler, self).__init__(hs)
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self.distributor.observe(
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"user_joined_room",
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self._on_user_joined
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)
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self.waiting_for_join_list = {}
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self.store = hs.get_datastore()
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self.replication_layer = hs.get_replication_layer()
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self.state_handler = hs.get_state_handler()
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# self.auth_handler = gs.get_auth_handler()
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self.server_name = hs.hostname
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self.keyring = hs.get_keyring()
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self.lock_manager = hs.get_room_lock_manager()
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self.replication_layer.set_handler(self)
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# When joining a room we need to queue any events for that room up
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self.room_queues = {}
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@log_function
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@defer.inlineCallbacks
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def handle_new_event(self, event, destinations):
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""" Takes in an event from the client to server side, that has already
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been authed and handled by the state module, and sends it to any
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remote home servers that may be interested.
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Args:
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event: The event to send
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destinations: A list of destinations to send it to
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Returns:
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Deferred: Resolved when it has successfully been queued for
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processing.
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"""
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yield run_on_reactor()
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self.replication_layer.send_pdu(event, destinations)
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@log_function
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@defer.inlineCallbacks
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def on_receive_pdu(self, origin, pdu, backfilled, state=None,
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auth_chain=None):
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""" Called by the ReplicationLayer when we have a new pdu. We need to
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do auth checks and put it through the StateHandler.
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"""
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event = pdu
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logger.debug("Got event: %s", event.event_id)
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# If we are currently in the process of joining this room, then we
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# queue up events for later processing.
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if event.room_id in self.room_queues:
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self.room_queues[event.room_id].append((pdu, origin))
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return
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logger.debug("Processing event: %s", event.event_id)
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logger.debug("Event: %s", event)
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# FIXME (erikj): Awful hack to make the case where we are not currently
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# in the room work
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current_state = None
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is_in_room = yield self.auth.check_host_in_room(
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event.room_id,
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self.server_name
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)
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if not is_in_room and not event.internal_metadata.is_outlier():
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logger.debug("Got event for room we're not in.")
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current_state = state
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event_ids = set()
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if state:
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event_ids |= {e.event_id for e in state}
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if auth_chain:
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event_ids |= {e.event_id for e in auth_chain}
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seen_ids = set(
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(yield self.store.have_events(event_ids)).keys()
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)
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if state and auth_chain is not None:
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# If we have any state or auth_chain given to us by the replication
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# layer, then we should handle them (if we haven't before.)
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for e in itertools.chain(auth_chain, state):
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if e.event_id in seen_ids:
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continue
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e.internal_metadata.outlier = True
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try:
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auth_ids = [e_id for e_id, _ in e.auth_events]
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auth = {
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(e.type, e.state_key): e for e in auth_chain
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if e.event_id in auth_ids
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}
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yield self._handle_new_event(
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origin, e, auth_events=auth
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)
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seen_ids.add(e.event_id)
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except:
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logger.exception(
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"Failed to handle state event %s",
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e.event_id,
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)
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try:
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yield self._handle_new_event(
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origin,
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event,
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state=state,
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backfilled=backfilled,
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current_state=current_state,
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)
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except AuthError as e:
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raise FederationError(
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"ERROR",
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e.code,
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e.msg,
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affected=event.event_id,
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)
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# if we're receiving valid events from an origin,
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# it's probably a good idea to mark it as not in retry-state
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# for sending (although this is a bit of a leap)
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retry_timings = yield self.store.get_destination_retry_timings(origin)
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if (retry_timings and retry_timings.retry_last_ts):
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self.store.set_destination_retry_timings(origin, 0, 0)
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room = yield self.store.get_room(event.room_id)
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if not room:
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try:
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yield self.store.store_room(
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room_id=event.room_id,
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room_creator_user_id="",
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is_public=False,
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)
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except StoreError:
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logger.exception("Failed to store room.")
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if not backfilled:
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extra_users = []
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if event.type == EventTypes.Member:
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target_user_id = event.state_key
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target_user = UserID.from_string(target_user_id)
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extra_users.append(target_user)
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yield self.notifier.on_new_room_event(
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event, extra_users=extra_users
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)
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if event.type == EventTypes.Member:
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if event.membership == Membership.JOIN:
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user = UserID.from_string(event.state_key)
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yield self.distributor.fire(
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"user_joined_room", user=user, room_id=event.room_id
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)
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@log_function
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@defer.inlineCallbacks
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def backfill(self, dest, room_id, limit):
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""" Trigger a backfill request to `dest` for the given `room_id`
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"""
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extremities = yield self.store.get_oldest_events_in_room(room_id)
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pdus = yield self.replication_layer.backfill(
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dest,
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room_id,
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limit,
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extremities=extremities,
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)
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events = []
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for pdu in pdus:
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event = pdu
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# FIXME (erikj): Not sure this actually works :/
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context = yield self.state_handler.compute_event_context(event)
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events.append((event, context))
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yield self.store.persist_event(
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event,
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context=context,
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backfilled=True
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)
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defer.returnValue(events)
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@defer.inlineCallbacks
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def send_invite(self, target_host, event):
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""" Sends the invite to the remote server for signing.
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Invites must be signed by the invitee's server before distribution.
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"""
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pdu = yield self.replication_layer.send_invite(
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destination=target_host,
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room_id=event.room_id,
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event_id=event.event_id,
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pdu=event
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)
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defer.returnValue(pdu)
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@defer.inlineCallbacks
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def on_event_auth(self, event_id):
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auth = yield self.store.get_auth_chain([event_id])
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for event in auth:
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event.signatures.update(
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compute_event_signature(
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event,
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self.hs.hostname,
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self.hs.config.signing_key[0]
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)
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)
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defer.returnValue([e for e in auth])
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@log_function
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@defer.inlineCallbacks
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def do_invite_join(self, target_hosts, room_id, joinee, content, snapshot):
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""" Attempts to join the `joinee` to the room `room_id` via the
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server `target_host`.
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This first triggers a /make_join/ request that returns a partial
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event that we can fill out and sign. This is then sent to the
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remote server via /send_join/ which responds with the state at that
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event and the auth_chains.
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We suspend processing of any received events from this room until we
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have finished processing the join.
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"""
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logger.debug("Joining %s to %s", joinee, room_id)
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origin, pdu = yield self.replication_layer.make_join(
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target_hosts,
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room_id,
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joinee
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)
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logger.debug("Got response to make_join: %s", pdu)
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event = pdu
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# We should assert some things.
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# FIXME: Do this in a nicer way
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assert(event.type == EventTypes.Member)
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assert(event.user_id == joinee)
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assert(event.state_key == joinee)
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assert(event.room_id == room_id)
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event.internal_metadata.outlier = False
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self.room_queues[room_id] = []
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builder = self.event_builder_factory.new(
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event.get_pdu_json()
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)
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handled_events = set()
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try:
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builder.event_id = self.event_builder_factory.create_event_id()
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builder.origin = self.hs.hostname
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builder.content = content
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if not hasattr(event, "signatures"):
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builder.signatures = {}
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add_hashes_and_signatures(
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builder,
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self.hs.hostname,
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self.hs.config.signing_key[0],
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)
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new_event = builder.build()
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# Try the host we successfully got a response to /make_join/
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# request first.
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try:
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target_hosts.remove(origin)
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target_hosts.insert(0, origin)
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except ValueError:
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pass
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ret = yield self.replication_layer.send_join(
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target_hosts,
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new_event
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)
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origin = ret["origin"]
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state = ret["state"]
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auth_chain = ret["auth_chain"]
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auth_chain.sort(key=lambda e: e.depth)
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handled_events.update([s.event_id for s in state])
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handled_events.update([a.event_id for a in auth_chain])
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handled_events.add(new_event.event_id)
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logger.debug("do_invite_join auth_chain: %s", auth_chain)
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logger.debug("do_invite_join state: %s", state)
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logger.debug("do_invite_join event: %s", new_event)
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try:
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yield self.store.store_room(
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room_id=room_id,
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room_creator_user_id="",
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is_public=False
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)
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except:
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# FIXME
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pass
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for e in auth_chain:
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e.internal_metadata.outlier = True
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if e.event_id == event.event_id:
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continue
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try:
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auth_ids = [e_id for e_id, _ in e.auth_events]
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auth = {
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(e.type, e.state_key): e for e in auth_chain
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if e.event_id in auth_ids
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}
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yield self._handle_new_event(
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origin, e, auth_events=auth
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)
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except:
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logger.exception(
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"Failed to handle auth event %s",
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e.event_id,
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)
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for e in state:
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if e.event_id == event.event_id:
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continue
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e.internal_metadata.outlier = True
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try:
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auth_ids = [e_id for e_id, _ in e.auth_events]
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auth = {
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(e.type, e.state_key): e for e in auth_chain
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if e.event_id in auth_ids
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}
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yield self._handle_new_event(
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origin, e, auth_events=auth
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)
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except:
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logger.exception(
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"Failed to handle state event %s",
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e.event_id,
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)
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auth_ids = [e_id for e_id, _ in event.auth_events]
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auth_events = {
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(e.type, e.state_key): e for e in auth_chain
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if e.event_id in auth_ids
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}
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yield self._handle_new_event(
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origin,
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new_event,
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state=state,
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current_state=state,
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auth_events=auth_events,
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)
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yield self.notifier.on_new_room_event(
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new_event, extra_users=[joinee]
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)
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logger.debug("Finished joining %s to %s", joinee, room_id)
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finally:
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room_queue = self.room_queues[room_id]
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del self.room_queues[room_id]
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for p, origin in room_queue:
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if p.event_id in handled_events:
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continue
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try:
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self.on_receive_pdu(origin, p, backfilled=False)
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except:
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logger.exception("Couldn't handle pdu")
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defer.returnValue(True)
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@defer.inlineCallbacks
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@log_function
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def on_make_join_request(self, room_id, user_id):
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""" We've received a /make_join/ request, so we create a partial
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join event for the room and return that. We don *not* persist or
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process it until the other server has signed it and sent it back.
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"""
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builder = self.event_builder_factory.new({
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"type": EventTypes.Member,
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"content": {"membership": Membership.JOIN},
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"room_id": room_id,
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"sender": user_id,
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"state_key": user_id,
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})
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event, context = yield self._create_new_client_event(
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builder=builder,
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)
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self.auth.check(event, auth_events=context.auth_events)
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pdu = event
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defer.returnValue(pdu)
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@defer.inlineCallbacks
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@log_function
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def on_send_join_request(self, origin, pdu):
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""" We have received a join event for a room. Fully process it and
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respond with the current state and auth chains.
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"""
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event = pdu
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logger.debug(
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"on_send_join_request: Got event: %s, signatures: %s",
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event.event_id,
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event.signatures,
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)
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event.internal_metadata.outlier = False
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context = yield self._handle_new_event(origin, event)
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logger.debug(
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"on_send_join_request: After _handle_new_event: %s, sigs: %s",
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event.event_id,
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event.signatures,
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)
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extra_users = []
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if event.type == EventTypes.Member:
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target_user_id = event.state_key
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target_user = UserID.from_string(target_user_id)
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extra_users.append(target_user)
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yield self.notifier.on_new_room_event(
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event, extra_users=extra_users
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)
|
|
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if event.type == EventTypes.Member:
|
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if event.content["membership"] == Membership.JOIN:
|
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user = UserID.from_string(event.state_key)
|
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yield self.distributor.fire(
|
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"user_joined_room", user=user, room_id=event.room_id
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)
|
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new_pdu = event
|
|
|
|
destinations = set()
|
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for k, s in context.current_state.items():
|
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try:
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if k[0] == EventTypes.Member:
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if s.content["membership"] == Membership.JOIN:
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destinations.add(
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UserID.from_string(s.state_key).domain
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)
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except:
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logger.warn(
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"Failed to get destination from event %s", s.event_id
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)
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destinations.discard(origin)
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|
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logger.debug(
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"on_send_join_request: Sending event: %s, signatures: %s",
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event.event_id,
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event.signatures,
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)
|
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self.replication_layer.send_pdu(new_pdu, destinations)
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state_ids = [e.event_id for e in context.current_state.values()]
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auth_chain = yield self.store.get_auth_chain(set(
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[event.event_id] + state_ids
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))
|
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defer.returnValue({
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"state": context.current_state.values(),
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"auth_chain": auth_chain,
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})
|
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|
|
@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 = pdu
|
|
|
|
event.internal_metadata.outlier = True
|
|
|
|
event.signatures.update(
|
|
compute_event_signature(
|
|
event,
|
|
self.hs.hostname,
|
|
self.hs.config.signing_key[0]
|
|
)
|
|
)
|
|
|
|
context = yield self.state_handler.compute_event_context(event)
|
|
|
|
yield self.store.persist_event(
|
|
event,
|
|
context=context,
|
|
backfilled=False,
|
|
)
|
|
|
|
target_user = UserID.from_string(event.state_key)
|
|
yield self.notifier.on_new_room_event(
|
|
event, extra_users=[target_user],
|
|
)
|
|
|
|
defer.returnValue(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 event and event.is_state():
|
|
# Get previous state
|
|
if "replaces_state" in event.unsigned:
|
|
prev_id = event.unsigned["replaces_state"]
|
|
if prev_id != event.event_id:
|
|
prev_event = yield self.store.get_event(prev_id)
|
|
results[(event.type, event.state_key)] = prev_event
|
|
else:
|
|
del results[(event.type, event.state_key)]
|
|
|
|
res = results.values()
|
|
for event in res:
|
|
event.signatures.update(
|
|
compute_event_signature(
|
|
event,
|
|
self.hs.hostname,
|
|
self.hs.config.signing_key[0]
|
|
)
|
|
)
|
|
|
|
defer.returnValue(res)
|
|
else:
|
|
defer.returnValue([])
|
|
|
|
@defer.inlineCallbacks
|
|
@log_function
|
|
def on_backfill_request(self, origin, room_id, pdu_list, limit):
|
|
in_room = yield self.auth.check_host_in_room(room_id, origin)
|
|
if not in_room:
|
|
raise AuthError(403, "Host not in room.")
|
|
|
|
events = yield self.store.get_backfill_events(
|
|
room_id,
|
|
pdu_list,
|
|
limit
|
|
)
|
|
|
|
defer.returnValue(events)
|
|
|
|
@defer.inlineCallbacks
|
|
@log_function
|
|
def get_persisted_pdu(self, origin, event_id, do_auth=True):
|
|
""" 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,
|
|
allow_rejected=True,
|
|
)
|
|
|
|
if event:
|
|
# FIXME: This is a temporary work around where we occasionally
|
|
# return events slightly differently than when they were
|
|
# originally signed
|
|
event.signatures.update(
|
|
compute_event_signature(
|
|
event,
|
|
self.hs.hostname,
|
|
self.hs.config.signing_key[0]
|
|
)
|
|
)
|
|
|
|
if do_auth:
|
|
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(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)
|
|
|
|
@defer.inlineCallbacks
|
|
@log_function
|
|
def _handle_new_event(self, origin, event, state=None, backfilled=False,
|
|
current_state=None, auth_events=None):
|
|
|
|
logger.debug(
|
|
"_handle_new_event: %s, sigs: %s",
|
|
event.event_id, event.signatures,
|
|
)
|
|
|
|
context = yield self.state_handler.compute_event_context(
|
|
event, old_state=state
|
|
)
|
|
|
|
if not auth_events:
|
|
auth_events = context.auth_events
|
|
|
|
logger.debug(
|
|
"_handle_new_event: %s, auth_events: %s",
|
|
event.event_id, auth_events,
|
|
)
|
|
|
|
is_new_state = not event.internal_metadata.is_outlier()
|
|
|
|
# This is a hack to fix some old rooms where the initial join event
|
|
# didn't reference the create event in its auth events.
|
|
if event.type == EventTypes.Member and not event.auth_events:
|
|
if len(event.prev_events) == 1:
|
|
c = yield self.store.get_event(event.prev_events[0][0])
|
|
if c.type == EventTypes.Create:
|
|
auth_events[(c.type, c.state_key)] = c
|
|
|
|
try:
|
|
yield self.do_auth(
|
|
origin, event, context, auth_events=auth_events
|
|
)
|
|
except AuthError as e:
|
|
logger.warn(
|
|
"Rejecting %s because %s",
|
|
event.event_id, e.msg
|
|
)
|
|
|
|
context.rejected = RejectedReason.AUTH_ERROR
|
|
|
|
# FIXME: Don't store as rejected with AUTH_ERROR if we haven't
|
|
# seen all the auth events.
|
|
yield self.store.persist_event(
|
|
event,
|
|
context=context,
|
|
backfilled=backfilled,
|
|
is_new_state=False,
|
|
current_state=current_state,
|
|
)
|
|
raise
|
|
|
|
yield self.store.persist_event(
|
|
event,
|
|
context=context,
|
|
backfilled=backfilled,
|
|
is_new_state=(is_new_state and not backfilled),
|
|
current_state=current_state,
|
|
)
|
|
|
|
defer.returnValue(context)
|
|
|
|
@defer.inlineCallbacks
|
|
def on_query_auth(self, origin, event_id, remote_auth_chain, rejects,
|
|
missing):
|
|
# Just go through and process each event in `remote_auth_chain`. We
|
|
# don't want to fall into the trap of `missing` being wrong.
|
|
for e in remote_auth_chain:
|
|
try:
|
|
yield self._handle_new_event(origin, e)
|
|
except AuthError:
|
|
pass
|
|
|
|
# Now get the current auth_chain for the event.
|
|
local_auth_chain = yield self.store.get_auth_chain([event_id])
|
|
|
|
# TODO: Check if we would now reject event_id. If so we need to tell
|
|
# everyone.
|
|
|
|
ret = yield self.construct_auth_difference(
|
|
local_auth_chain, remote_auth_chain
|
|
)
|
|
|
|
for event in ret["auth_chain"]:
|
|
event.signatures.update(
|
|
compute_event_signature(
|
|
event,
|
|
self.hs.hostname,
|
|
self.hs.config.signing_key[0]
|
|
)
|
|
)
|
|
|
|
logger.debug("on_query_auth returning: %s", ret)
|
|
|
|
defer.returnValue(ret)
|
|
|
|
@defer.inlineCallbacks
|
|
@log_function
|
|
def do_auth(self, origin, event, context, auth_events):
|
|
# Check if we have all the auth events.
|
|
have_events = yield self.store.have_events(
|
|
[e_id for e_id, _ in event.auth_events]
|
|
)
|
|
|
|
event_auth_events = set(e_id for e_id, _ in event.auth_events)
|
|
seen_events = set(have_events.keys())
|
|
|
|
missing_auth = event_auth_events - seen_events
|
|
|
|
if missing_auth:
|
|
logger.debug("Missing auth: %s", missing_auth)
|
|
# If we don't have all the auth events, we need to get them.
|
|
try:
|
|
remote_auth_chain = yield self.replication_layer.get_event_auth(
|
|
origin, event.room_id, event.event_id
|
|
)
|
|
|
|
seen_remotes = yield self.store.have_events(
|
|
[e.event_id for e in remote_auth_chain]
|
|
)
|
|
|
|
for e in remote_auth_chain:
|
|
if e.event_id in seen_remotes.keys():
|
|
continue
|
|
|
|
if e.event_id == event.event_id:
|
|
continue
|
|
|
|
try:
|
|
auth_ids = [e_id for e_id, _ in e.auth_events]
|
|
auth = {
|
|
(e.type, e.state_key): e for e in remote_auth_chain
|
|
if e.event_id in auth_ids
|
|
}
|
|
e.internal_metadata.outlier = True
|
|
|
|
logger.debug(
|
|
"do_auth %s missing_auth: %s",
|
|
event.event_id, e.event_id
|
|
)
|
|
yield self._handle_new_event(
|
|
origin, e, auth_events=auth
|
|
)
|
|
|
|
if e.event_id in event_auth_events:
|
|
auth_events[(e.type, e.state_key)] = e
|
|
except AuthError:
|
|
pass
|
|
|
|
have_events = yield self.store.have_events(
|
|
[e_id for e_id, _ in event.auth_events]
|
|
)
|
|
seen_events = set(have_events.keys())
|
|
except:
|
|
# FIXME:
|
|
logger.exception("Failed to get auth chain")
|
|
|
|
# FIXME: Assumes we have and stored all the state for all the
|
|
# prev_events
|
|
current_state = set(e.event_id for e in auth_events.values())
|
|
different_auth = event_auth_events - current_state
|
|
|
|
if different_auth and not event.internal_metadata.is_outlier():
|
|
# Do auth conflict res.
|
|
logger.debug("Different auth: %s", different_auth)
|
|
|
|
# Only do auth resolution if we have something new to say.
|
|
# We can't rove an auth failure.
|
|
do_resolution = False
|
|
for e_id in different_auth:
|
|
if e_id in have_events:
|
|
if have_events[e_id] != RejectedReason.AUTH_ERROR:
|
|
do_resolution = True
|
|
break
|
|
|
|
if do_resolution:
|
|
# 1. Get what we think is the auth chain.
|
|
auth_ids = self.auth.compute_auth_events(
|
|
event, context.current_state
|
|
)
|
|
local_auth_chain = yield self.store.get_auth_chain(auth_ids)
|
|
|
|
try:
|
|
# 2. Get remote difference.
|
|
result = yield self.replication_layer.query_auth(
|
|
origin,
|
|
event.room_id,
|
|
event.event_id,
|
|
local_auth_chain,
|
|
)
|
|
|
|
seen_remotes = yield self.store.have_events(
|
|
[e.event_id for e in result["auth_chain"]]
|
|
)
|
|
|
|
# 3. Process any remote auth chain events we haven't seen.
|
|
for ev in result["auth_chain"]:
|
|
if ev.event_id in seen_remotes.keys():
|
|
continue
|
|
|
|
if ev.event_id == event.event_id:
|
|
continue
|
|
|
|
try:
|
|
auth_ids = [e_id for e_id, _ in ev.auth_events]
|
|
auth = {
|
|
(e.type, e.state_key): e
|
|
for e in result["auth_chain"]
|
|
if e.event_id in auth_ids
|
|
}
|
|
ev.internal_metadata.outlier = True
|
|
|
|
logger.debug(
|
|
"do_auth %s different_auth: %s",
|
|
event.event_id, e.event_id
|
|
)
|
|
|
|
yield self._handle_new_event(
|
|
origin, ev, auth_events=auth
|
|
)
|
|
|
|
if ev.event_id in event_auth_events:
|
|
auth_events[(ev.type, ev.state_key)] = ev
|
|
except AuthError:
|
|
pass
|
|
|
|
except:
|
|
# FIXME:
|
|
logger.exception("Failed to query auth chain")
|
|
|
|
# 4. Look at rejects and their proofs.
|
|
# TODO.
|
|
|
|
context.current_state.update(auth_events)
|
|
context.state_group = None
|
|
|
|
try:
|
|
self.auth.check(event, auth_events=auth_events)
|
|
except AuthError:
|
|
raise
|
|
|
|
@defer.inlineCallbacks
|
|
def construct_auth_difference(self, local_auth, remote_auth):
|
|
""" Given a local and remote auth chain, find the differences. This
|
|
assumes that we have already processed all events in remote_auth
|
|
|
|
Params:
|
|
local_auth (list)
|
|
remote_auth (list)
|
|
|
|
Returns:
|
|
dict
|
|
"""
|
|
|
|
logger.debug("construct_auth_difference Start!")
|
|
|
|
# TODO: Make sure we are OK with local_auth or remote_auth having more
|
|
# auth events in them than strictly necessary.
|
|
|
|
def sort_fun(ev):
|
|
return ev.depth, ev.event_id
|
|
|
|
logger.debug("construct_auth_difference after sort_fun!")
|
|
|
|
# We find the differences by starting at the "bottom" of each list
|
|
# and iterating up on both lists. The lists are ordered by depth and
|
|
# then event_id, we iterate up both lists until we find the event ids
|
|
# don't match. Then we look at depth/event_id to see which side is
|
|
# missing that event, and iterate only up that list. Repeat.
|
|
|
|
remote_list = list(remote_auth)
|
|
remote_list.sort(key=sort_fun)
|
|
|
|
local_list = list(local_auth)
|
|
local_list.sort(key=sort_fun)
|
|
|
|
local_iter = iter(local_list)
|
|
remote_iter = iter(remote_list)
|
|
|
|
logger.debug("construct_auth_difference before get_next!")
|
|
|
|
def get_next(it, opt=None):
|
|
try:
|
|
return it.next()
|
|
except:
|
|
return opt
|
|
|
|
current_local = get_next(local_iter)
|
|
current_remote = get_next(remote_iter)
|
|
|
|
logger.debug("construct_auth_difference before while")
|
|
|
|
missing_remotes = []
|
|
missing_locals = []
|
|
while current_local or current_remote:
|
|
if current_remote is None:
|
|
missing_locals.append(current_local)
|
|
current_local = get_next(local_iter)
|
|
continue
|
|
|
|
if current_local is None:
|
|
missing_remotes.append(current_remote)
|
|
current_remote = get_next(remote_iter)
|
|
continue
|
|
|
|
if current_local.event_id == current_remote.event_id:
|
|
current_local = get_next(local_iter)
|
|
current_remote = get_next(remote_iter)
|
|
continue
|
|
|
|
if current_local.depth < current_remote.depth:
|
|
missing_locals.append(current_local)
|
|
current_local = get_next(local_iter)
|
|
continue
|
|
|
|
if current_local.depth > current_remote.depth:
|
|
missing_remotes.append(current_remote)
|
|
current_remote = get_next(remote_iter)
|
|
continue
|
|
|
|
# They have the same depth, so we fall back to the event_id order
|
|
if current_local.event_id < current_remote.event_id:
|
|
missing_locals.append(current_local)
|
|
current_local = get_next(local_iter)
|
|
|
|
if current_local.event_id > current_remote.event_id:
|
|
missing_remotes.append(current_remote)
|
|
current_remote = get_next(remote_iter)
|
|
continue
|
|
|
|
logger.debug("construct_auth_difference after while")
|
|
|
|
# missing locals should be sent to the server
|
|
# We should find why we are missing remotes, as they will have been
|
|
# rejected.
|
|
|
|
# Remove events from missing_remotes if they are referencing a missing
|
|
# remote. We only care about the "root" rejected ones.
|
|
missing_remote_ids = [e.event_id for e in missing_remotes]
|
|
base_remote_rejected = list(missing_remotes)
|
|
for e in missing_remotes:
|
|
for e_id, _ in e.auth_events:
|
|
if e_id in missing_remote_ids:
|
|
try:
|
|
base_remote_rejected.remove(e)
|
|
except ValueError:
|
|
pass
|
|
|
|
reason_map = {}
|
|
|
|
for e in base_remote_rejected:
|
|
reason = yield self.store.get_rejection_reason(e.event_id)
|
|
if reason is None:
|
|
# TODO: e is not in the current state, so we should
|
|
# construct some proof of that.
|
|
continue
|
|
|
|
reason_map[e.event_id] = reason
|
|
|
|
if reason == RejectedReason.AUTH_ERROR:
|
|
pass
|
|
elif reason == RejectedReason.REPLACED:
|
|
# TODO: Get proof
|
|
pass
|
|
elif reason == RejectedReason.NOT_ANCESTOR:
|
|
# TODO: Get proof.
|
|
pass
|
|
|
|
logger.debug("construct_auth_difference returning")
|
|
|
|
defer.returnValue({
|
|
"auth_chain": local_auth,
|
|
"rejects": {
|
|
e.event_id: {
|
|
"reason": reason_map[e.event_id],
|
|
"proof": None,
|
|
}
|
|
for e in base_remote_rejected
|
|
},
|
|
"missing": [e.event_id for e in missing_locals],
|
|
})
|