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// Copyright 2017 Vector Creations 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.
package routing
import (
"net/http"
"sync"
"github.com/matrix-org/dendrite/clientapi/httputil"
"github.com/matrix-org/dendrite/clientapi/jsonerror"
"github.com/matrix-org/dendrite/internal/config"
"github.com/matrix-org/dendrite/internal/eventutil"
"github.com/matrix-org/dendrite/internal/transactions"
"github.com/matrix-org/dendrite/roomserver/api"
userapi "github.com/matrix-org/dendrite/userapi/api"
"github.com/matrix-org/gomatrixserverlib"
"github.com/matrix-org/util"
"github.com/sirupsen/logrus"
)
// http://matrix.org/docs/spec/client_server/r0.2.0.html#put-matrix-client-r0-rooms-roomid-send-eventtype-txnid
// http://matrix.org/docs/spec/client_server/r0.2.0.html#put-matrix-client-r0-rooms-roomid-state-eventtype-statekey
type sendEventResponse struct {
EventID string `json:"event_id"`
}
var (
userRoomSendMutexes sync.Map // (roomID+userID) -> mutex. mutexes to ensure correct ordering of sendEvents
)
// SendEvent implements:
// /rooms/{roomID}/send/{eventType}
// /rooms/{roomID}/send/{eventType}/{txnID}
// /rooms/{roomID}/state/{eventType}/{stateKey}
func SendEvent(
req *http.Request,
device *userapi.Device,
roomID, eventType string, txnID, stateKey *string,
cfg *config.ClientAPI,
rsAPI api.RoomserverInternalAPI,
txnCache *transactions.Cache,
) util.JSONResponse {
verReq := api.QueryRoomVersionForRoomRequest{RoomID: roomID}
verRes := api.QueryRoomVersionForRoomResponse{}
if err := rsAPI.QueryRoomVersionForRoom(req.Context(), &verReq, &verRes); err != nil {
return util.JSONResponse{
Code: http.StatusBadRequest,
JSON: jsonerror.UnsupportedRoomVersion(err.Error()),
}
}
if txnID != nil {
// Try to fetch response from transactionsCache
if res, ok := txnCache.FetchTransaction(device.AccessToken, *txnID); ok {
return *res
}
}
// create a mutex for the specific user in the specific room
// this avoids a situation where events that are received in quick succession are sent to the roomserver in a jumbled order
userID := device.UserID
mutex, _ := userRoomSendMutexes.LoadOrStore(roomID+userID, &sync.Mutex{})
mutex.(*sync.Mutex).Lock()
defer mutex.(*sync.Mutex).Unlock()
e, resErr := generateSendEvent(req, device, roomID, eventType, stateKey, cfg, rsAPI)
if resErr != nil {
return *resErr
}
var txnAndSessionID *api.TransactionID
if txnID != nil {
txnAndSessionID = &api.TransactionID{
TransactionID: *txnID,
SessionID: device.SessionID,
}
}
// pass the new event to the roomserver and receive the correct event ID
// event ID in case of duplicate transaction is discarded
if err := api.SendEvents(
req.Context(), rsAPI,
api.KindNew,
[]gomatrixserverlib.HeaderedEvent{
e.Headered(verRes.RoomVersion),
},
cfg.Matrix.ServerName,
txnAndSessionID,
); err != nil {
util.GetLogger(req.Context()).WithError(err).Error("SendEvents failed")
return jsonerror.InternalServerError()
}
util.GetLogger(req.Context()).WithFields(logrus.Fields{
"event_id": e.EventID(),
"room_id": roomID,
"room_version": verRes.RoomVersion,
}).Info("Sent event to roomserver")
res := util.JSONResponse{
Code: http.StatusOK,
JSON: sendEventResponse{e.EventID()},
}
// Add response to transactionsCache
if txnID != nil {
txnCache.AddTransaction(device.AccessToken, *txnID, &res)
}
return res
}
func generateSendEvent(
req *http.Request,
device *userapi.Device,
roomID, eventType string, stateKey *string,
cfg *config.ClientAPI,
rsAPI api.RoomserverInternalAPI,
) (*gomatrixserverlib.Event, *util.JSONResponse) {
// parse the incoming http request
userID := device.UserID
var r map[string]interface{} // must be a JSON object
resErr := httputil.UnmarshalJSONRequest(req, &r)
if resErr != nil {
return nil, resErr
}
evTime, err := httputil.ParseTSParam(req)
if err != nil {
return nil, &util.JSONResponse{
Code: http.StatusBadRequest,
JSON: jsonerror.InvalidArgumentValue(err.Error()),
}
}
// create the new event and set all the fields we can
builder := gomatrixserverlib.EventBuilder{
Sender: userID,
RoomID: roomID,
Type: eventType,
StateKey: stateKey,
}
err = builder.SetContent(r)
if err != nil {
util.GetLogger(req.Context()).WithError(err).Error("builder.SetContent failed")
resErr := jsonerror.InternalServerError()
return nil, &resErr
}
var queryRes api.QueryLatestEventsAndStateResponse
e, err := eventutil.QueryAndBuildEvent(req.Context(), &builder, cfg.Matrix, evTime, rsAPI, &queryRes)
if err == eventutil.ErrRoomNoExists {
return nil, &util.JSONResponse{
Code: http.StatusNotFound,
JSON: jsonerror.NotFound("Room does not exist"),
}
} else if e, ok := err.(gomatrixserverlib.BadJSONError); ok {
return nil, &util.JSONResponse{
Code: http.StatusBadRequest,
JSON: jsonerror.BadJSON(e.Error()),
}
} else if e, ok := err.(gomatrixserverlib.EventValidationError); ok {
if e.Code == gomatrixserverlib.EventValidationTooLarge {
return nil, &util.JSONResponse{
Code: http.StatusRequestEntityTooLarge,
JSON: jsonerror.BadJSON(e.Error()),
}
}
return nil, &util.JSONResponse{
Code: http.StatusBadRequest,
JSON: jsonerror.BadJSON(e.Error()),
}
} else if err != nil {
util.GetLogger(req.Context()).WithError(err).Error("eventutil.BuildEvent failed")
resErr := jsonerror.InternalServerError()
return nil, &resErr
}
// check to see if this user can perform this operation
stateEvents := make([]*gomatrixserverlib.Event, len(queryRes.StateEvents))
for i := range queryRes.StateEvents {
stateEvents[i] = &queryRes.StateEvents[i].Event
}
provider := gomatrixserverlib.NewAuthEvents(stateEvents)
if err = gomatrixserverlib.Allowed(e.Event, &provider); err != nil {
return nil, &util.JSONResponse{
Code: http.StatusForbidden,
JSON: jsonerror.Forbidden(err.Error()), // TODO: Is this error string comprehensible to the client?
}
}
return &e.Event, nil
}
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