1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
|
# 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, Tuple
from synapse.api.constants import MAIN_TIMELINE, ReceiptTypes
from synapse.api.errors import Codes, SynapseError
from synapse.http.server import HttpServer
from synapse.http.servlet import RestServlet, parse_json_object_from_request
from synapse.http.site import SynapseRequest
from synapse.types import EventID, JsonDict, RoomID
from ._base import client_patterns
if TYPE_CHECKING:
from synapse.server import HomeServer
logger = logging.getLogger(__name__)
class ReceiptRestServlet(RestServlet):
PATTERNS = client_patterns(
"/rooms/(?P<room_id>[^/]*)"
"/receipt/(?P<receipt_type>[^/]*)"
"/(?P<event_id>[^/]*)$"
)
CATEGORY = "Receipts requests"
def __init__(self, hs: "HomeServer"):
super().__init__()
self.auth = hs.get_auth()
self.receipts_handler = hs.get_receipts_handler()
self.read_marker_handler = hs.get_read_marker_handler()
self.presence_handler = hs.get_presence_handler()
self._main_store = hs.get_datastores().main
self._known_receipt_types = {
ReceiptTypes.READ,
ReceiptTypes.READ_PRIVATE,
ReceiptTypes.FULLY_READ,
}
async def on_POST(
self, request: SynapseRequest, room_id: str, receipt_type: str, event_id: str
) -> Tuple[int, JsonDict]:
requester = await self.auth.get_user_by_req(request)
if not RoomID.is_valid(room_id) or not event_id.startswith(EventID.SIGIL):
raise SynapseError(400, "A valid room ID and event ID must be specified")
if receipt_type not in self._known_receipt_types:
raise SynapseError(
400,
f"Receipt type must be {', '.join(self._known_receipt_types)}",
)
body = parse_json_object_from_request(request)
# Pull the thread ID, if one exists.
thread_id = None
if "thread_id" in body:
thread_id = body.get("thread_id")
if not thread_id or not isinstance(thread_id, str):
raise SynapseError(
400,
"thread_id field must be a non-empty string",
Codes.INVALID_PARAM,
)
if receipt_type == ReceiptTypes.FULLY_READ:
raise SynapseError(
400,
f"thread_id is not compatible with {ReceiptTypes.FULLY_READ} receipts.",
Codes.INVALID_PARAM,
)
# Ensure the event ID roughly correlates to the thread ID.
if not await self._is_event_in_thread(event_id, thread_id):
raise SynapseError(
400,
f"event_id {event_id} is not related to thread {thread_id}",
Codes.INVALID_PARAM,
)
await self.presence_handler.bump_presence_active_time(requester.user)
if receipt_type == ReceiptTypes.FULLY_READ:
await self.read_marker_handler.received_client_read_marker(
room_id,
user_id=requester.user.to_string(),
event_id=event_id,
)
else:
await self.receipts_handler.received_client_receipt(
room_id,
receipt_type,
user_id=requester.user.to_string(),
event_id=event_id,
thread_id=thread_id,
)
return 200, {}
async def _is_event_in_thread(self, event_id: str, thread_id: str) -> bool:
"""
The event must be related to the thread ID (in a vague sense) to ensure
clients aren't sending bogus receipts.
A thread ID is considered valid for a given event E if:
1. E has a thread relation which matches the thread ID;
2. E has another event which has a thread relation to E matching the
thread ID; or
3. E is recursively related (via any rel_type) to an event which
satisfies 1 or 2.
Given the following DAG:
A <---[m.thread]-- B <--[m.annotation]-- C
^
|--[m.reference]-- D <--[m.annotation]-- E
It is valid to send a receipt for thread A on A, B, C, D, or E.
It is valid to send a receipt for the main timeline on A, D, and E.
Args:
event_id: The event ID to check.
thread_id: The thread ID the event is potentially part of.
Returns:
True if the event belongs to the given thread, otherwise False.
"""
# If the receipt is on the main timeline, it is enough to check whether
# the event is directly related to a thread.
if thread_id == MAIN_TIMELINE:
return MAIN_TIMELINE == await self._main_store.get_thread_id(event_id)
# Otherwise, check if the event is directly part of a thread, or is the
# root message (or related to the root message) of a thread.
return thread_id == await self._main_store.get_thread_id_for_receipts(event_id)
def register_servlets(hs: "HomeServer", http_server: HttpServer) -> None:
ReceiptRestServlet(hs).register(http_server)
|
