# Copyright 2015, 2016 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.
import logging
from typing import TYPE_CHECKING, Iterable, List, Optional, Tuple
from synapse.api.constants import ReadReceiptEventFields
from synapse.appservice import ApplicationService
from synapse.streams import EventSource
from synapse.types import JsonDict, ReadReceipt, UserID, get_domain_from_id
if TYPE_CHECKING:
from synapse.server import HomeServer
logger = logging.getLogger(__name__)
class ReceiptsHandler:
def __init__(self, hs: "HomeServer"):
self.notifier = hs.get_notifier()
self.server_name = hs.config.server.server_name
self.store = hs.get_datastore()
self.event_auth_handler = hs.get_event_auth_handler()
self.hs = hs
# We only need to poke the federation sender explicitly if its on the
# same instance. Other federation sender instances will get notified by
# `synapse.app.generic_worker.FederationSenderHandler` when it sees it
# in the receipts stream.
self.federation_sender = None
if hs.should_send_federation():
self.federation_sender = hs.get_federation_sender()
# If we can handle the receipt EDUs we do so, otherwise we route them
# to the appropriate worker.
if hs.get_instance_name() in hs.config.worker.writers.receipts:
hs.get_federation_registry().register_edu_handler(
"m.receipt", self._received_remote_receipt
)
else:
hs.get_federation_registry().register_instances_for_edu(
"m.receipt",
hs.config.worker.writers.receipts,
)
self.clock = self.hs.get_clock()
self.state = hs.get_state_handler()
async def _received_remote_receipt(self, origin: str, content: JsonDict) -> None:
"""Called when we receive an EDU of type m.receipt from a remote HS."""
receipts = []
for room_id, room_values in content.items():
# If we're not in the room just ditch the event entirely. This is
# probably an old server that has come back and thinks we're still in
# the room (or we've been rejoined to the room by a state reset).
is_in_room = await self.event_auth_handler.check_host_in_room(
room_id, self.server_name
)
if not is_in_room:
logger.info(
"Ignoring receipt for room %r from server %s as we're not in the room",
room_id,
origin,
)
continue
for receipt_type, users in room_values.items():
for user_id, user_values in users.items():
if get_domain_from_id(user_id) != origin:
logger.info(
"Received receipt for user %r from server %s, ignoring",
user_id,
origin,
)
continue
receipts.append(
ReadReceipt(
room_id=room_id,
receipt_type=receipt_type,
user_id=user_id,
event_ids=user_values["event_ids"],
data=user_values.get("data", {}),
)
)
await self._handle_new_receipts(receipts)
async def _handle_new_receipts(self, receipts: List[ReadReceipt]) -> bool:
"""Takes a list of receipts, stores them and informs the notifier."""
min_batch_id: Optional[int] = None
max_batch_id: Optional[int] = None
for receipt in receipts:
res = await self.store.insert_receipt(
receipt.room_id,
receipt.receipt_type,
receipt.user_id,
receipt.event_ids,
receipt.data,
)
if not res:
# res will be None if this read receipt is 'old'
continue
stream_id, max_persisted_id = res
if min_batch_id is None or stream_id < min_batch_id:
min_batch_id = stream_id
if max_batch_id is None or max_persisted_id > max_batch_id:
max_batch_id = max_persisted_id
# Either both of these should be None or neither.
if min_batch_id is None or max_batch_id is None:
# no new receipts
return False
affected_room_ids = list({r.room_id for r in receipts})
self.notifier.on_new_event("receipt_key", max_batch_id, rooms=affected_room_ids)
# Note that the min here shouldn't be relied upon to be accurate.
await self.hs.get_pusherpool().on_new_receipts(
min_batch_id, max_batch_id, affected_room_ids
)
return True
async def received_client_receipt(
self, room_id: str, receipt_type: str, user_id: str, event_id: str, hidden: bool
) -> None:
"""Called when a client tells us a local user has read up to the given
event_id in the room.
"""
receipt = ReadReceipt(
room_id=room_id,
receipt_type=receipt_type,
user_id=user_id,
event_ids=[event_id],
data={"ts": int(self.clock.time_msec()), "hidden": hidden},
)
is_new = await self._handle_new_receipts([receipt])
if not is_new:
return
if self.federation_sender and not (
self.hs.config.experimental.msc2285_enabled and hidden
):
await self.federation_sender.send_read_receipt(receipt)
class ReceiptEventSource(EventSource[int, JsonDict]):
def __init__(self, hs: "HomeServer"):
self.store = hs.get_datastore()
self.config = hs.config
@staticmethod
def filter_out_hidden(events: List[JsonDict], user_id: str) -> List[JsonDict]:
visible_events = []
# filter out hidden receipts the user shouldn't see
for event in events:
content = event.get("content", {})
new_event = event.copy()
new_event["content"] = {}
for event_id in content.keys():
event_content = content.get(event_id, {})
m_read = event_content.get("m.read", {})
# If m_read is missing copy over the original event_content as there is nothing to process here
if not m_read:
new_event["content"][event_id] = event_content.copy()
continue
new_users = {}
for rr_user_id, user_rr in m_read.items():
try:
hidden = user_rr.get("hidden")
except AttributeError:
# Due to https://github.com/matrix-org/synapse/issues/10376
# there are cases where user_rr is a string, in those cases
# we just ignore the read receipt
continue
if hidden is not True or rr_user_id == user_id:
new_users[rr_user_id] = user_rr.copy()
# If hidden has a value replace hidden with the correct prefixed key
if hidden is not None:
new_users[rr_user_id].pop("hidden")
new_users[rr_user_id][
ReadReceiptEventFields.MSC2285_HIDDEN
] = hidden
# Set new users unless empty
if len(new_users.keys()) > 0:
new_event["content"][event_id] = {"m.read": new_users}
# Append new_event to visible_events unless empty
if len(new_event["content"].keys()) > 0:
visible_events.append(new_event)
return visible_events
async def get_new_events(
self,
user: UserID,
from_key: int,
limit: Optional[int],
room_ids: Iterable[str],
is_guest: bool,
explicit_room_id: Optional[str] = None,
) -> Tuple[List[JsonDict], int]:
from_key = int(from_key)
to_key = self.get_current_key()
if from_key == to_key:
return [], to_key
events = await self.store.get_linearized_receipts_for_rooms(
room_ids, from_key=from_key, to_key=to_key
)
if self.config.experimental.msc2285_enabled:
events = ReceiptEventSource.filter_out_hidden(events, user.to_string())
return events, to_key
async def get_new_events_as(
self, from_key: int, service: ApplicationService
) -> Tuple[List[JsonDict], int]:
"""Returns a set of new read receipt events that an appservice
may be interested in.
Args:
from_key: the stream position at which events should be fetched from
service: The appservice which may be interested
Returns:
A two-tuple containing the following:
* A list of json dictionaries derived from read receipts that the
appservice may be interested in.
* The current read receipt stream token.
"""
from_key = int(from_key)
to_key = self.get_current_key()
if from_key == to_key:
return [], to_key
# Fetch all read receipts for all rooms, up to a limit of 100. This is ordered
# by most recent.
rooms_to_events = await self.store.get_linearized_receipts_for_all_rooms(
from_key=from_key, to_key=to_key
)
# Then filter down to rooms that the AS can read
events = []
for room_id, event in rooms_to_events.items():
if not await service.matches_user_in_member_list(room_id, self.store):
continue
events.append(event)
return events, to_key
def get_current_key(self, direction: str = "f") -> int:
return self.store.get_max_receipt_stream_id()