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
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
|
// Copyright 2020 The Matrix.org Foundation C.I.C.
//
// 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.
package routing
import (
"context"
"errors"
"net/http"
"time"
"github.com/matrix-org/gomatrixserverlib"
"github.com/matrix-org/gomatrixserverlib/spec"
"github.com/matrix-org/util"
"github.com/matrix-org/dendrite/clientapi/httputil"
"github.com/matrix-org/dendrite/internal/eventutil"
"github.com/matrix-org/dendrite/internal/transactions"
roomserverAPI "github.com/matrix-org/dendrite/roomserver/api"
"github.com/matrix-org/dendrite/roomserver/types"
"github.com/matrix-org/dendrite/setup/config"
userapi "github.com/matrix-org/dendrite/userapi/api"
)
type redactionContent struct {
Reason string `json:"reason"`
}
type redactionResponse struct {
EventID string `json:"event_id"`
}
func SendRedaction(
req *http.Request, device *userapi.Device, roomID, eventID string, cfg *config.ClientAPI,
rsAPI roomserverAPI.ClientRoomserverAPI,
txnID *string,
txnCache *transactions.Cache,
) util.JSONResponse {
resErr := checkMemberInRoom(req.Context(), rsAPI, device.UserID, roomID)
if resErr != nil {
return *resErr
}
if txnID != nil {
// Try to fetch response from transactionsCache
if res, ok := txnCache.FetchTransaction(device.AccessToken, *txnID, req.URL); ok {
return *res
}
}
ev := roomserverAPI.GetEvent(req.Context(), rsAPI, roomID, eventID)
if ev == nil {
return util.JSONResponse{
Code: 400,
JSON: spec.NotFound("unknown event ID"), // TODO: is it ok to leak existence?
}
}
if ev.RoomID() != roomID {
return util.JSONResponse{
Code: 400,
JSON: spec.NotFound("cannot redact event in another room"),
}
}
fullUserID, userIDErr := spec.NewUserID(device.UserID, true)
if userIDErr != nil {
return util.JSONResponse{
Code: http.StatusForbidden,
JSON: spec.Forbidden("userID doesn't have power level to redact"),
}
}
senderID, queryErr := rsAPI.QuerySenderIDForUser(req.Context(), roomID, *fullUserID)
if queryErr != nil {
return util.JSONResponse{
Code: http.StatusForbidden,
JSON: spec.Forbidden("userID doesn't have power level to redact"),
}
}
// "Users may redact their own events, and any user with a power level greater than or equal
// to the redact power level of the room may redact events there"
// https://matrix.org/docs/spec/client_server/r0.6.1#put-matrix-client-r0-rooms-roomid-redact-eventid-txnid
allowedToRedact := ev.SenderID() == senderID // TODO: Should replace device.UserID with device...PerRoomKey
if !allowedToRedact {
plEvent := roomserverAPI.GetStateEvent(req.Context(), rsAPI, roomID, gomatrixserverlib.StateKeyTuple{
EventType: spec.MRoomPowerLevels,
StateKey: "",
})
if plEvent == nil {
return util.JSONResponse{
Code: 403,
JSON: spec.Forbidden("You don't have permission to redact this event, no power_levels event in this room."),
}
}
pl, err := plEvent.PowerLevels()
if err != nil {
return util.JSONResponse{
Code: 403,
JSON: spec.Forbidden(
"You don't have permission to redact this event, the power_levels event for this room is malformed so auth checks cannot be performed.",
),
}
}
allowedToRedact = pl.UserLevel(senderID) >= pl.Redact
}
if !allowedToRedact {
return util.JSONResponse{
Code: 403,
JSON: spec.Forbidden("You don't have permission to redact this event, power level too low."),
}
}
var r redactionContent
resErr = httputil.UnmarshalJSONRequest(req, &r)
if resErr != nil {
return *resErr
}
// create the new event and set all the fields we can
proto := gomatrixserverlib.ProtoEvent{
SenderID: string(senderID),
RoomID: roomID,
Type: spec.MRoomRedaction,
Redacts: eventID,
}
err := proto.SetContent(r)
if err != nil {
util.GetLogger(req.Context()).WithError(err).Error("proto.SetContent failed")
return util.JSONResponse{
Code: http.StatusInternalServerError,
JSON: spec.InternalServerError{},
}
}
identity, err := cfg.Matrix.SigningIdentityFor(device.UserDomain())
if err != nil {
return util.JSONResponse{
Code: http.StatusInternalServerError,
JSON: spec.InternalServerError{},
}
}
var queryRes roomserverAPI.QueryLatestEventsAndStateResponse
e, err := eventutil.QueryAndBuildEvent(req.Context(), &proto, identity, time.Now(), rsAPI, &queryRes)
if errors.Is(err, eventutil.ErrRoomNoExists{}) {
return util.JSONResponse{
Code: http.StatusNotFound,
JSON: spec.NotFound("Room does not exist"),
}
}
domain := device.UserDomain()
if err = roomserverAPI.SendEvents(context.Background(), rsAPI, roomserverAPI.KindNew, []*types.HeaderedEvent{e}, device.UserDomain(), domain, domain, nil, false); err != nil {
util.GetLogger(req.Context()).WithError(err).Errorf("failed to SendEvents")
return util.JSONResponse{
Code: http.StatusInternalServerError,
JSON: spec.InternalServerError{},
}
}
res := util.JSONResponse{
Code: 200,
JSON: redactionResponse{
EventID: e.EventID(),
},
}
// Add response to transactionsCache
if txnID != nil {
txnCache.AddTransaction(device.AccessToken, *txnID, req.URL, &res)
}
return res
}
|
