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Merge pull request #9150 from Yoric/develop-context 

New API /_synapse/admin/rooms/{roomId}/context/{eventId}
This commit is contained in:
David Teller 2021-02-08 15:53:44 +01:00 committed by GitHub
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1
changelog.d/9150.feature Normal file
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@ -0,0 +1 @@
New API /_synapse/admin/rooms/{roomId}/context/{eventId}.

119
docs/admin_api/rooms.md
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@ -10,6 +10,7 @@
* [Undoing room shutdowns](#undoing-room-shutdowns)
- [Make Room Admin API](#make-room-admin-api)
- [Forward Extremities Admin API](#forward-extremities-admin-api)
- [Event Context API](#event-context-api)
# List Room API
@ -594,3 +595,121 @@ that were deleted.
"deleted": 1
}
```
# Event Context API
This API lets a client find the context of an event. This is designed primarily to investigate abuse reports.
```
GET /_synapse/admin/v1/rooms/<room_id>/context/<event_id>
```
This API mimmicks [GET /_matrix/client/r0/rooms/{roomId}/context/{eventId}](https://matrix.org/docs/spec/client_server/r0.6.1#get-matrix-client-r0-rooms-roomid-context-eventid). Please refer to the link for all details on parameters and reseponse.
Example response:
```json
{
"end": "t29-57_2_0_2",
"events_after": [
{
"content": {
"body": "This is an example text message",
"msgtype": "m.text",
"format": "org.matrix.custom.html",
"formatted_body": "<b>This is an example text message</b>"
},
"type": "m.room.message",
"event_id": "$143273582443PhrSn:example.org",
"room_id": "!636q39766251:example.com",
"sender": "@example:example.org",
"origin_server_ts": 1432735824653,
"unsigned": {
"age": 1234
}
}
],
"event": {
"content": {
"body": "filename.jpg",
"info": {
"h": 398,
"w": 394,
"mimetype": "image/jpeg",
"size": 31037
},
"url": "mxc://example.org/JWEIFJgwEIhweiWJE",
"msgtype": "m.image"
},
"type": "m.room.message",
"event_id": "$f3h4d129462ha:example.com",
"room_id": "!636q39766251:example.com",
"sender": "@example:example.org",
"origin_server_ts": 1432735824653,
"unsigned": {
"age": 1234
}
},
"events_before": [
{
"content": {
"body": "something-important.doc",
"filename": "something-important.doc",
"info": {
"mimetype": "application/msword",
"size": 46144
},
"msgtype": "m.file",
"url": "mxc://example.org/FHyPlCeYUSFFxlgbQYZmoEoe"
},
"type": "m.room.message",
"event_id": "$143273582443PhrSn:example.org",
"room_id": "!636q39766251:example.com",
"sender": "@example:example.org",
"origin_server_ts": 1432735824653,
"unsigned": {
"age": 1234
}
}
],
"start": "t27-54_2_0_2",
"state": [
{
"content": {
"creator": "@example:example.org",
"room_version": "1",
"m.federate": true,
"predecessor": {
"event_id": "$something:example.org",
"room_id": "!oldroom:example.org"
}
},
"type": "m.room.create",
"event_id": "$143273582443PhrSn:example.org",
"room_id": "!636q39766251:example.com",
"sender": "@example:example.org",
"origin_server_ts": 1432735824653,
"unsigned": {
"age": 1234
},
"state_key": ""
},
{
"content": {
"membership": "join",
"avatar_url": "mxc://example.org/SEsfnsuifSDFSSEF",
"displayname": "Alice Margatroid"
},
"type": "m.room.member",
"event_id": "$143273582443PhrSn:example.org",
"room_id": "!636q39766251:example.com",
"sender": "@example:example.org",
"origin_server_ts": 1432735824653,
"unsigned": {
"age": 1234
},
"state_key": "@alice:example.org"
}
]
}
```

21
synapse/handlers/room.py
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@ -38,6 +38,7 @@ from synapse.api.filtering import Filter
from synapse.api.room_versions import KNOWN_ROOM_VERSIONS, RoomVersion
from synapse.events import EventBase
from synapse.events.utils import copy_power_levels_contents
from synapse.rest.admin._base import assert_user_is_admin
from synapse.storage.state import StateFilter
from synapse.types import (
JsonDict,
@ -1004,41 +1005,51 @@ class RoomCreationHandler(BaseHandler):
class RoomContextHandler:
def __init__(self, hs: "HomeServer"):
self.hs = hs
self.auth = hs.get_auth()
self.store = hs.get_datastore()
self.storage = hs.get_storage()
self.state_store = self.storage.state
async def get_event_context(
self,
user: UserID,
requester: Requester,
room_id: str,
event_id: str,
limit: int,
event_filter: Optional[Filter],
use_admin_priviledge: bool = False,
) -> Optional[JsonDict]:
"""Retrieves events, pagination tokens and state around a given event
in a room.
Args:
user
requester
room_id
event_id
limit: The maximum number of events to return in total
(excluding state).
event_filter: the filter to apply to the events returned
(excluding the target event_id)
use_admin_priviledge: if `True`, return all events, regardless
of whether `user` has access to them. To be used **ONLY**
from the admin API.
Returns:
dict, or None if the event isn't found
"""
user = requester.user
if use_admin_priviledge:
await assert_user_is_admin(self.auth, requester.user)
before_limit = math.floor(limit / 2.0)
after_limit = limit - before_limit
users = await self.store.get_users_in_room(room_id)
is_peeking = user.to_string() not in users
def filter_evts(events):
return filter_events_for_client(
async def filter_evts(events):
if use_admin_priviledge:
return events
return await filter_events_for_client(
self.storage, user.to_string(), events, is_peeking=is_peeking
)

2
synapse/rest/admin/__init__.py
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@ -42,6 +42,7 @@ from synapse.rest.admin.rooms import (
JoinRoomAliasServlet,
ListRoomRestServlet,
MakeRoomAdminRestServlet,
RoomEventContextServlet,
RoomMembersRestServlet,
RoomRestServlet,
RoomStateRestServlet,
@ -238,6 +239,7 @@ def register_servlets(hs, http_server):
MakeRoomAdminRestServlet(hs).register(http_server)
ShadowBanRestServlet(hs).register(http_server)
ForwardExtremitiesRestServlet(hs).register(http_server)
RoomEventContextServlet(hs).register(http_server)
def register_servlets_for_client_rest_resource(hs, http_server):

65
synapse/rest/admin/rooms.py
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@ -15,9 +15,11 @@
import logging
from http import HTTPStatus
from typing import TYPE_CHECKING, List, Optional, Tuple
from urllib import parse as urlparse
from synapse.api.constants import EventTypes, JoinRules, Membership
from synapse.api.errors import AuthError, Codes, NotFoundError, SynapseError
from synapse.api.filtering import Filter
from synapse.http.servlet import (
RestServlet,
assert_params_in_dict,
@ -33,6 +35,7 @@ from synapse.rest.admin._base import (
)
from synapse.storage.databases.main.room import RoomSortOrder
from synapse.types import JsonDict, RoomAlias, RoomID, UserID, create_requester
from synapse.util import json_decoder
if TYPE_CHECKING:
from synapse.server import HomeServer
@ -605,3 +608,65 @@ class ForwardExtremitiesRestServlet(RestServlet):
extremities = await self.store.get_forward_extremities_for_room(room_id)
return 200, {"count": len(extremities), "results": extremities}
class RoomEventContextServlet(RestServlet):
"""
Provide the context for an event.
This API is designed to be used when system administrators wish to look at
an abuse report and understand what happened during and immediately prior
to this event.
"""
PATTERNS = admin_patterns("/rooms/(?P<room_id>[^/]*)/context/(?P<event_id>[^/]*)$")
def __init__(self, hs):
super().__init__()
self.clock = hs.get_clock()
self.room_context_handler = hs.get_room_context_handler()
self._event_serializer = hs.get_event_client_serializer()
self.auth = hs.get_auth()
async def on_GET(self, request, room_id, event_id):
requester = await self.auth.get_user_by_req(request, allow_guest=False)
await assert_user_is_admin(self.auth, requester.user)
limit = parse_integer(request, "limit", default=10)
# picking the API shape for symmetry with /messages
filter_str = parse_string(request, b"filter", encoding="utf-8")
if filter_str:
filter_json = urlparse.unquote(filter_str)
event_filter = Filter(
json_decoder.decode(filter_json)
) # type: Optional[Filter]
else:
event_filter = None
results = await self.room_context_handler.get_event_context(
requester,
room_id,
event_id,
limit,
event_filter,
use_admin_priviledge=True,
)
if not results:
raise SynapseError(404, "Event not found.", errcode=Codes.NOT_FOUND)
time_now = self.clock.time_msec()
results["events_before"] = await self._event_serializer.serialize_events(
results["events_before"], time_now
)
results["event"] = await self._event_serializer.serialize_event(
results["event"], time_now
)
results["events_after"] = await self._event_serializer.serialize_events(
results["events_after"], time_now
)
results["state"] = await self._event_serializer.serialize_events(
results["state"], time_now
)
return 200, results

2
synapse/rest/client/v1/room.py
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@ -650,7 +650,7 @@ class RoomEventContextServlet(RestServlet):
event_filter = None
results = await self.room_context_handler.get_event_context(
requester.user, room_id, event_id, limit, event_filter
requester, room_id, event_id, limit, event_filter
)
if not results:

1
synapse/visibility.py
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@ -80,6 +80,7 @@ async def filter_events_for_client(
events = [e for e in events if not e.internal_metadata.is_soft_failed()]
types = ((EventTypes.RoomHistoryVisibility, ""), (EventTypes.Member, user_id))
event_id_to_state = await storage.state.get_state_for_events(
frozenset(e.event_id for e in events),
state_filter=StateFilter.from_types(types),

84
tests/rest/admin/test_room.py
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@ -1445,6 +1445,90 @@ class JoinAliasRoomTestCase(unittest.HomeserverTestCase):
self.assertEquals(200, int(channel.result["code"]), msg=channel.result["body"])
self.assertEqual(private_room_id, channel.json_body["joined_rooms"][0])
def test_context_as_non_admin(self):
"""
Test that, without being admin, one cannot use the context admin API
"""
# Create a room.
user_id = self.register_user("test", "test")
user_tok = self.login("test", "test")
self.register_user("test_2", "test")
user_tok_2 = self.login("test_2", "test")
room_id = self.helper.create_room_as(user_id, tok=user_tok)
# Populate the room with events.
events = []
for i in range(30):
events.append(
self.helper.send_event(
room_id, "com.example.test", content={"index": i}, tok=user_tok
)
)
# Now attempt to find the context using the admin API without being admin.
midway = (len(events) - 1) // 2
for tok in [user_tok, user_tok_2]:
channel = self.make_request(
"GET",
"/_synapse/admin/v1/rooms/%s/context/%s"
% (room_id, events[midway]["event_id"]),
access_token=tok,
)
self.assertEquals(
403, int(channel.result["code"]), msg=channel.result["body"]
)
self.assertEqual(Codes.FORBIDDEN, channel.json_body["errcode"])
def test_context_as_admin(self):
"""
Test that, as admin, we can find the context of an event without having joined the room.
"""
# Create a room. We're not part of it.
user_id = self.register_user("test", "test")
user_tok = self.login("test", "test")
room_id = self.helper.create_room_as(user_id, tok=user_tok)
# Populate the room with events.
events = []
for i in range(30):
events.append(
self.helper.send_event(
room_id, "com.example.test", content={"index": i}, tok=user_tok
)
)
# Now let's fetch the context for this room.
midway = (len(events) - 1) // 2
channel = self.make_request(
"GET",
"/_synapse/admin/v1/rooms/%s/context/%s"
% (room_id, events[midway]["event_id"]),
access_token=self.admin_user_tok,
)
self.assertEquals(200, int(channel.result["code"]), msg=channel.result["body"])
self.assertEquals(
channel.json_body["event"]["event_id"], events[midway]["event_id"]
)
for i, found_event in enumerate(channel.json_body["events_before"]):
for j, posted_event in enumerate(events):
if found_event["event_id"] == posted_event["event_id"]:
self.assertTrue(j < midway)
break
else:
self.fail("Event %s from events_before not found" % j)
for i, found_event in enumerate(channel.json_body["events_after"]):
for j, posted_event in enumerate(events):
if found_event["event_id"] == posted_event["event_id"]:
self.assertTrue(j > midway)
break
else:
self.fail("Event %s from events_after not found" % j)
class MakeRoomAdminTestCase(unittest.HomeserverTestCase):
servlets = [