Implement client single event retrieval
ADD
clientapi/routing/getevent.go
+// Copyright 2019 Alex Chen
+//
+// 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"
+
+ "github.com/matrix-org/dendrite/clientapi/auth/authtypes"
+ "github.com/matrix-org/dendrite/clientapi/httputil"
+ "github.com/matrix-org/dendrite/clientapi/jsonerror"
+ "github.com/matrix-org/dendrite/common/config"
+ "github.com/matrix-org/dendrite/roomserver/api"
+ "github.com/matrix-org/gomatrixserverlib"
+ "github.com/matrix-org/util"
+)
+
+type getEventRequest struct {
+ req *http.Request
+ device *authtypes.Device
+ roomID string
+ eventID string
+ cfg config.Dendrite
+ federation *gomatrixserverlib.FederationClient
+ keyRing gomatrixserverlib.KeyRing
+ requestedEvent gomatrixserverlib.Event
+}
+
+// GetEvent implements GET /_matrix/client/r0/rooms/{roomId}/event/{eventId}
+// https://matrix.org/docs/spec/client_server/r0.4.0.html#get-matrix-client-r0-rooms-roomid-event-eventid
+func GetEvent(
+ req *http.Request,
+ device *authtypes.Device,
+ roomID string,
+ eventID string,
+ cfg config.Dendrite,
+ queryAPI api.RoomserverQueryAPI,
+ federation *gomatrixserverlib.FederationClient,
+ keyRing gomatrixserverlib.KeyRing,
+) util.JSONResponse {
+ eventsReq := api.QueryEventsByIDRequest{
+ EventIDs: []string{eventID},
+ }
+ var eventsResp api.QueryEventsByIDResponse
+ err := queryAPI.QueryEventsByID(req.Context(), &eventsReq, &eventsResp)
+ if err != nil {
+ return httputil.LogThenError(req, err)
+ }
+
+ if len(eventsResp.Events) == 0 {
+ // Event not found locally
+ return util.JSONResponse{
+ Code: http.StatusNotFound,
+ JSON: jsonerror.NotFound("The event was not found or you do not have permission to read this event"),
+ }
+ }
+
+ requestedEvent := eventsResp.Events[0]
+
+ r := getEventRequest{
+ req: req,
+ device: device,
+ roomID: roomID,
+ eventID: eventID,
+ cfg: cfg,
+ federation: federation,
+ keyRing: keyRing,
+ requestedEvent: requestedEvent,
+ }
+
+ stateReq := api.QueryStateAfterEventsRequest{
+ RoomID: r.requestedEvent.RoomID(),
+ PrevEventIDs: r.requestedEvent.PrevEventIDs(),
+ StateToFetch: []gomatrixserverlib.StateKeyTuple{{
+ EventType: gomatrixserverlib.MRoomMember,
+ StateKey: device.UserID,
+ }},
+ }
+ var stateResp api.QueryStateAfterEventsResponse
+ if err := queryAPI.QueryStateAfterEvents(req.Context(), &stateReq, &stateResp); err != nil {
+ return httputil.LogThenError(req, err)
+ }
+
+ if !stateResp.RoomExists {
+ util.GetLogger(req.Context()).Errorf("Expected to find room for event %s but failed", r.requestedEvent.EventID())
+ return jsonerror.InternalServerError()
+ }
+
+ if !stateResp.PrevEventsExist {
+ // Missing some events locally; stateResp.StateEvents unavailable.
+ return util.JSONResponse{
+ Code: http.StatusNotFound,
+ JSON: jsonerror.NotFound("The event was not found or you do not have permission to read this event"),
+ }
+ }
+
+ for _, stateEvent := range stateResp.StateEvents {
+ if stateEvent.StateKeyEquals(r.device.UserID) {
+ membership, err := stateEvent.Membership()
+ if err != nil {
+ return httputil.LogThenError(req, err)
+ }
+ if membership == gomatrixserverlib.Join {
+ return util.JSONResponse{
+ Code: http.StatusOK,
+ JSON: gomatrixserverlib.ToClientEvent(r.requestedEvent, gomatrixserverlib.FormatAll),
+ }
+ }
+ }
+ }
+
+ return util.JSONResponse{
+ Code: http.StatusNotFound,
+ JSON: jsonerror.NotFound("The event was not found or you do not have permission to read this event"),
+ }
+}

MODIFY
clientapi/routing/routing.go
clientapi/routing/routing.go
@@ -132,6 +132,15 @@ func Setup(
nil, cfg, queryAPI, producer, transactionsCache)
}),
).Methods(http.MethodPut, http.MethodOptions)
+ r0mux.Handle("/rooms/{roomID}/event/{eventID}",
+ common.MakeAuthAPI("rooms_get_event", authData, func(req *http.Request, device *authtypes.Device) util.JSONResponse {
+ vars, err := common.URLDecodeMapValues(mux.Vars(req))
+ if err != nil {
+ return util.ErrorResponse(err)
+ }
+ return GetEvent(req, device, vars["roomID"], vars["eventID"], cfg, queryAPI, federation, keyRing)
+ }),
+ ).Methods(http.MethodGet, http.MethodOptions)
r0mux.Handle("/rooms/{roomID}/state/{eventType:[^/]+/?}",
common.MakeAuthAPI("send_message", authData, func(req *http.Request, device *authtypes.Device) util.JSONResponse {
vars, err := common.URLDecodeMapValues(mux.Vars(req))

MODIFY
testfile
testfile
@@ -168,3 +168,5 @@ Newly updated tags appear in an incremental v2 /sync
Deleted tags appear in an incremental v2 /sync
/event/ on non world readable room does not work
Outbound federation can query profile data
+/event/ on joined room works
+/event/ does not allow access to events before the user joined

Implement client single event retrieval (#693)