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// Copyright 2022 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 (
"database/sql"
"encoding/json"
"fmt"
"net/http"
"strconv"
"github.com/matrix-org/dendrite/clientapi/jsonerror"
"github.com/matrix-org/dendrite/internal/caching"
roomserver "github.com/matrix-org/dendrite/roomserver/api"
"github.com/matrix-org/dendrite/syncapi/storage"
userapi "github.com/matrix-org/dendrite/userapi/api"
"github.com/matrix-org/gomatrixserverlib"
"github.com/matrix-org/util"
"github.com/sirupsen/logrus"
)
type ContextRespsonse struct {
End string `json:"end"`
Event gomatrixserverlib.ClientEvent `json:"event"`
EventsAfter []gomatrixserverlib.ClientEvent `json:"events_after,omitempty"`
EventsBefore []gomatrixserverlib.ClientEvent `json:"events_before,omitempty"`
Start string `json:"start"`
State []gomatrixserverlib.ClientEvent `json:"state"`
}
func Context(
req *http.Request, device *userapi.Device,
rsAPI roomserver.SyncRoomserverAPI,
syncDB storage.Database,
roomID, eventID string,
lazyLoadCache caching.LazyLoadCache,
) util.JSONResponse {
filter, err := parseRoomEventFilter(req)
if err != nil {
errMsg := ""
switch err.(type) {
case *json.InvalidUnmarshalError:
errMsg = "unable to parse filter"
case *strconv.NumError:
errMsg = "unable to parse limit"
}
return util.JSONResponse{
Code: http.StatusBadRequest,
JSON: jsonerror.InvalidParam(errMsg),
Headers: nil,
}
}
if filter.Rooms != nil {
*filter.Rooms = append(*filter.Rooms, roomID)
}
ctx := req.Context()
membershipRes := roomserver.QueryMembershipForUserResponse{}
membershipReq := roomserver.QueryMembershipForUserRequest{UserID: device.UserID, RoomID: roomID}
if err = rsAPI.QueryMembershipForUser(ctx, &membershipReq, &membershipRes); err != nil {
logrus.WithError(err).Error("unable to query membership")
return jsonerror.InternalServerError()
}
if !membershipRes.RoomExists {
return util.JSONResponse{
Code: http.StatusForbidden,
JSON: jsonerror.Forbidden("room does not exist"),
}
}
stateFilter := gomatrixserverlib.StateFilter{
Limit: 100,
NotSenders: filter.NotSenders,
NotTypes: filter.NotTypes,
Senders: filter.Senders,
Types: filter.Types,
LazyLoadMembers: filter.LazyLoadMembers,
IncludeRedundantMembers: filter.IncludeRedundantMembers,
NotRooms: filter.NotRooms,
Rooms: filter.Rooms,
ContainsURL: filter.ContainsURL,
}
// TODO: Get the actual state at the last event returned by SelectContextAfterEvent
state, _ := syncDB.CurrentState(ctx, roomID, &stateFilter, nil)
// verify the user is allowed to see the context for this room/event
for _, x := range state {
var hisVis string
hisVis, err = x.HistoryVisibility()
if err != nil {
continue
}
allowed := hisVis == gomatrixserverlib.WorldReadable || membershipRes.Membership == gomatrixserverlib.Join
if !allowed {
return util.JSONResponse{
Code: http.StatusForbidden,
JSON: jsonerror.Forbidden("User is not allowed to query context"),
}
}
}
id, requestedEvent, err := syncDB.SelectContextEvent(ctx, roomID, eventID)
if err != nil {
if err == sql.ErrNoRows {
return util.JSONResponse{
Code: http.StatusNotFound,
JSON: jsonerror.NotFound(fmt.Sprintf("Event %s not found", eventID)),
}
}
logrus.WithError(err).WithField("eventID", eventID).Error("unable to find requested event")
return jsonerror.InternalServerError()
}
eventsBefore, err := syncDB.SelectContextBeforeEvent(ctx, id, roomID, filter)
if err != nil && err != sql.ErrNoRows {
logrus.WithError(err).Error("unable to fetch before events")
return jsonerror.InternalServerError()
}
_, eventsAfter, err := syncDB.SelectContextAfterEvent(ctx, id, roomID, filter)
if err != nil && err != sql.ErrNoRows {
logrus.WithError(err).Error("unable to fetch after events")
return jsonerror.InternalServerError()
}
eventsBeforeClient := gomatrixserverlib.HeaderedToClientEvents(eventsBefore, gomatrixserverlib.FormatAll)
eventsAfterClient := gomatrixserverlib.HeaderedToClientEvents(eventsAfter, gomatrixserverlib.FormatAll)
newState := applyLazyLoadMembers(device, filter, eventsAfterClient, eventsBeforeClient, state, lazyLoadCache)
response := ContextRespsonse{
Event: gomatrixserverlib.HeaderedToClientEvent(&requestedEvent, gomatrixserverlib.FormatAll),
EventsAfter: eventsAfterClient,
EventsBefore: eventsBeforeClient,
State: gomatrixserverlib.HeaderedToClientEvents(newState, gomatrixserverlib.FormatAll),
}
if len(response.State) > filter.Limit {
response.State = response.State[len(response.State)-filter.Limit:]
}
return util.JSONResponse{
Code: http.StatusOK,
JSON: response,
}
}
func applyLazyLoadMembers(
device *userapi.Device,
filter *gomatrixserverlib.RoomEventFilter,
eventsAfter, eventsBefore []gomatrixserverlib.ClientEvent,
state []*gomatrixserverlib.HeaderedEvent,
lazyLoadCache caching.LazyLoadCache,
) []*gomatrixserverlib.HeaderedEvent {
if filter == nil || !filter.LazyLoadMembers {
return state
}
allEvents := append(eventsBefore, eventsAfter...)
x := make(map[string]struct{})
// get members who actually send an event
for _, e := range allEvents {
// Don't add membership events the client should already know about
if _, cached := lazyLoadCache.IsLazyLoadedUserCached(device, e.RoomID, e.Sender); cached {
continue
}
x[e.Sender] = struct{}{}
}
newState := []*gomatrixserverlib.HeaderedEvent{}
membershipEvents := []*gomatrixserverlib.HeaderedEvent{}
for _, event := range state {
if event.Type() != gomatrixserverlib.MRoomMember {
newState = append(newState, event)
} else {
// did the user send an event?
if _, ok := x[event.Sender()]; ok {
membershipEvents = append(membershipEvents, event)
lazyLoadCache.StoreLazyLoadedUser(device, event.RoomID(), event.Sender(), event.EventID())
}
}
}
// Add the membershipEvents to the end of the list, to make Sytest happy
return append(newState, membershipEvents...)
}
func parseRoomEventFilter(req *http.Request) (*gomatrixserverlib.RoomEventFilter, error) {
// Default room filter
filter := &gomatrixserverlib.RoomEventFilter{Limit: 10}
l := req.URL.Query().Get("limit")
f := req.URL.Query().Get("filter")
if l != "" {
limit, err := strconv.Atoi(l)
if err != nil {
return nil, err
}
// NOTSPEC: feels like a good idea to have an upper bound limit
if limit > 100 {
limit = 100
}
filter.Limit = limit
}
if f != "" {
if err := json.Unmarshal([]byte(f), &filter); err != nil {
return nil, err
}
}
return filter, nil
}
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