diff --git a/src/github.com/matrix-org/dendrite/federationapi/routing/leave.go b/src/github.com/matrix-org/dendrite/federationapi/routing/leave.go new file mode 100644 index 000000000..d9527a4c7 --- /dev/null +++ b/src/github.com/matrix-org/dendrite/federationapi/routing/leave.go @@ -0,0 +1,174 @@ +// 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 ( + "encoding/json" + "net/http" + + "github.com/matrix-org/dendrite/clientapi/httputil" + "github.com/matrix-org/dendrite/clientapi/jsonerror" + "github.com/matrix-org/dendrite/clientapi/producers" + "github.com/matrix-org/dendrite/common" + "github.com/matrix-org/dendrite/common/config" + "github.com/matrix-org/dendrite/roomserver/api" + "github.com/matrix-org/gomatrixserverlib" + "github.com/matrix-org/util" +) + +// MakeLeave implements the /make_leave API +func MakeLeave( + httpReq *http.Request, + request *gomatrixserverlib.FederationRequest, + cfg config.Dendrite, + query api.RoomserverQueryAPI, + roomID, userID string, +) util.JSONResponse { + _, domain, err := gomatrixserverlib.SplitID('@', userID) + if err != nil { + return util.JSONResponse{ + Code: http.StatusBadRequest, + JSON: jsonerror.BadJSON("Invalid UserID"), + } + } + if domain != request.Origin() { + return util.JSONResponse{ + Code: http.StatusForbidden, + JSON: jsonerror.Forbidden("The leave must be sent by the server of the user"), + } + } + + // Try building an event for the server + builder := gomatrixserverlib.EventBuilder{ + Sender: userID, + RoomID: roomID, + Type: "m.room.member", + StateKey: &userID, + } + err = builder.SetContent(map[string]interface{}{"membership": "leave"}) + if err != nil { + return httputil.LogThenError(httpReq, err) + } + + var queryRes api.QueryLatestEventsAndStateResponse + event, err := common.BuildEvent(httpReq.Context(), &builder, cfg, query, &queryRes) + if err == common.ErrRoomNoExists { + return util.JSONResponse{ + Code: http.StatusNotFound, + JSON: jsonerror.NotFound("Room does not exist"), + } + } else if err != nil { + return httputil.LogThenError(httpReq, err) + } + + // Check that the leave is allowed or not + stateEvents := make([]*gomatrixserverlib.Event, len(queryRes.StateEvents)) + for i := range queryRes.StateEvents { + stateEvents[i] = &queryRes.StateEvents[i] + } + provider := gomatrixserverlib.NewAuthEvents(stateEvents) + if err = gomatrixserverlib.Allowed(*event, &provider); err != nil { + return util.JSONResponse{ + Code: http.StatusForbidden, + JSON: jsonerror.Forbidden(err.Error()), + } + } + + return util.JSONResponse{ + Code: http.StatusOK, + JSON: map[string]interface{}{"event": builder}, + } +} + +// SendLeave implements the /send_leave API +func SendLeave( + httpReq *http.Request, + request *gomatrixserverlib.FederationRequest, + cfg config.Dendrite, + producer *producers.RoomserverProducer, + keys gomatrixserverlib.KeyRing, + roomID, eventID string, +) util.JSONResponse { + var event gomatrixserverlib.Event + if err := json.Unmarshal(request.Content(), &event); err != nil { + return util.JSONResponse{ + Code: http.StatusBadRequest, + JSON: jsonerror.NotJSON("The request body could not be decoded into valid JSON. " + err.Error()), + } + } + + // Check that the room ID is correct. + if event.RoomID() != roomID { + return util.JSONResponse{ + Code: http.StatusBadRequest, + JSON: jsonerror.BadJSON("The room ID in the request path must match the room ID in the leave event JSON"), + } + } + + // Check that the event ID is correct. + if event.EventID() != eventID { + return util.JSONResponse{ + Code: http.StatusBadRequest, + JSON: jsonerror.BadJSON("The event ID in the request path must match the event ID in the leave event JSON"), + } + } + + // Check that the event is from the server sending the request. + if event.Origin() != request.Origin() { + return util.JSONResponse{ + Code: http.StatusForbidden, + JSON: jsonerror.Forbidden("The leave must be sent by the server it originated on"), + } + } + + // Check that the event is signed by the server sending the request. + verifyRequests := []gomatrixserverlib.VerifyJSONRequest{{ + ServerName: event.Origin(), + Message: event.Redact().JSON(), + AtTS: event.OriginServerTS(), + }} + verifyResults, err := keys.VerifyJSONs(httpReq.Context(), verifyRequests) + if err != nil { + return httputil.LogThenError(httpReq, err) + } + if verifyResults[0].Error != nil { + return util.JSONResponse{ + Code: http.StatusForbidden, + JSON: jsonerror.Forbidden("The leave must be signed by the server it originated on"), + } + } + + // check membership is set to leave + mem, err := event.Membership() + if err != nil { + return httputil.LogThenError(httpReq, err) + } else if mem != "leave" { + return util.JSONResponse{ + Code: http.StatusBadRequest, + JSON: jsonerror.BadJSON("The membership in the event content must be set to leave"), + } + } + + // Send the events to the room server. + // We are responsible for notifying other servers that the user has left + // the room, so set SendAsServer to cfg.Matrix.ServerName + _, err = producer.SendEvents(httpReq.Context(), []gomatrixserverlib.Event{event}, cfg.Matrix.ServerName, nil) + if err != nil { + return httputil.LogThenError(httpReq, err) + } + + return util.JSONResponse{ + Code: http.StatusOK, + JSON: struct{}{}, + } +} diff --git a/src/github.com/matrix-org/dendrite/federationapi/routing/routing.go b/src/github.com/matrix-org/dendrite/federationapi/routing/routing.go index 910698952..d52f3e63c 100644 --- a/src/github.com/matrix-org/dendrite/federationapi/routing/routing.go +++ b/src/github.com/matrix-org/dendrite/federationapi/routing/routing.go @@ -182,6 +182,30 @@ func Setup( }, )).Methods(http.MethodPut) + v1fedmux.Handle("/make_leave/{roomID}/{userID}", common.MakeFedAPI( + "federation_make_leave", cfg.Matrix.ServerName, keys, + func(httpReq *http.Request, request *gomatrixserverlib.FederationRequest) util.JSONResponse { + vars := mux.Vars(httpReq) + roomID := vars["roomID"] + userID := vars["userID"] + return MakeLeave( + httpReq, request, cfg, query, roomID, userID, + ) + }, + )).Methods(http.MethodGet) + + v1fedmux.Handle("/send_leave/{roomID}/{userID}", common.MakeFedAPI( + "federation_send_leave", cfg.Matrix.ServerName, keys, + func(httpReq *http.Request, request *gomatrixserverlib.FederationRequest) util.JSONResponse { + vars := mux.Vars(httpReq) + roomID := vars["roomID"] + userID := vars["userID"] + return SendLeave( + httpReq, request, cfg, producer, keys, roomID, userID, + ) + }, + )).Methods(http.MethodPut) + v1fedmux.Handle("/version", common.MakeExternalAPI( "federation_version", func(httpReq *http.Request) util.JSONResponse {