Add aliases endpoint to client API

clientapi/routing/aliases.go

@@ -0,0 +1,89 @@
+// 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 (
+	"fmt"
+	"net/http"
+
+	"github.com/matrix-org/dendrite/clientapi/jsonerror"
+	"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"
+)
+
+// GetAliases implements GET /_matrix/client/r0/rooms/{roomId}/aliases
+func GetAliases(
+	req *http.Request, rsAPI api.RoomserverInternalAPI, device *userapi.Device, roomID string,
+) util.JSONResponse {
+	stateTuple := gomatrixserverlib.StateKeyTuple{
+		EventType: gomatrixserverlib.MRoomHistoryVisibility,
+		StateKey:  "",
+	}
+	stateReq := &api.QueryCurrentStateRequest{
+		RoomID:      roomID,
+		StateTuples: []gomatrixserverlib.StateKeyTuple{stateTuple},
+	}
+	stateRes := &api.QueryCurrentStateResponse{}
+	if err := rsAPI.QueryCurrentState(req.Context(), stateReq, stateRes); err != nil {
+		util.GetLogger(req.Context()).WithError(err).Error("rsAPI.QueryCurrentState failed")
+		return util.ErrorResponse(fmt.Errorf("rsAPI.QueryCurrentState: %w", err))
+	}
+
+	if historyVisEvent, ok := stateRes.StateEvents[stateTuple]; ok {
+		visibility, err := historyVisEvent.HistoryVisibility()
+		if err != nil {
+			util.GetLogger(req.Context()).WithError(err).Error("historyVisEvent.HistoryVisibility failed")
+			return util.ErrorResponse(fmt.Errorf("historyVisEvent.HistoryVisibility: %w", err))
+		}
+		if visibility != "world_readable" {
+			queryReq := api.QueryMembershipForUserRequest{
+				RoomID: roomID,
+				UserID: device.UserID,
+			}
+			var queryRes api.QueryMembershipForUserResponse
+			if err := rsAPI.QueryMembershipForUser(req.Context(), &queryReq, &queryRes); err != nil {
+				util.GetLogger(req.Context()).WithError(err).Error("rsAPI.QueryMembershipsForRoom failed")
+				return jsonerror.InternalServerError()
+			}
+			if !queryRes.IsInRoom {
+				return util.JSONResponse{
+					Code: http.StatusForbidden,
+					JSON: jsonerror.Forbidden("You aren't a member of this room."),
+				}
+			}
+		}
+	}
+
+	aliasesReq := api.GetAliasesForRoomIDRequest{
+		RoomID: roomID,
+	}
+	aliasesRes := api.GetAliasesForRoomIDResponse{}
+	if err := rsAPI.GetAliasesForRoomID(req.Context(), &aliasesReq, &aliasesRes); err != nil {
+		util.GetLogger(req.Context()).WithError(err).Error("rsAPI.GetAliasesForRoomID failed")
+		return util.ErrorResponse(fmt.Errorf("rsAPI.GetAliasesForRoomID: %w", err))
+	}
+
+	return util.JSONResponse{
+		Code: 200,
+		JSON: struct {
+			Aliases []string `json:"aliases"`
+		}{
+			Aliases: aliasesRes.Aliases,
+		},
+	}
+}

clientapi/routing/routing.go

@@ -275,6 +275,14 @@ func Setup(
 		return OnIncomingStateRequest(req.Context(), device, rsAPI, vars["roomID"])
 	})).Methods(http.MethodGet, http.MethodOptions)
 
+	r0mux.Handle("/rooms/{roomID}/aliases", httputil.MakeAuthAPI("aliases", userAPI, func(req *http.Request, device *userapi.Device) util.JSONResponse {
+		vars, err := httputil.URLDecodeMapValues(mux.Vars(req))
+		if err != nil {
+			return util.ErrorResponse(err)
+		}
+		return GetAliases(req, rsAPI, device, vars["roomID"])
+	})).Methods(http.MethodGet, http.MethodOptions)
+
 	r0mux.Handle("/rooms/{roomID}/state/{type:[^/]+/?}", httputil.MakeAuthAPI("room_state", userAPI, func(req *http.Request, device *userapi.Device) util.JSONResponse {
 		vars, err := httputil.URLDecodeMapValues(mux.Vars(req))
 		if err != nil {