Implement leaving room method

STATUS.md

@@ -11,6 +11,7 @@ Implemented from [Client-Server API](https://matrix.org/docs/spec/client_server/
 - [x] [5.7.1 GET /_matrix/client/r0/account/whoami](https://matrix.org/docs/spec/client_server/latest#get-matrix-client-r0-account-whoami)
 - [x] [6.1 GET /_matrix/client/r0/capabilities](https://matrix.org/docs/spec/client_server/latest#get-matrix-client-r0-capabilities)
 - [x] [10.4.1 GET /_matrix/client/r0/joined_rooms](https://matrix.org/docs/spec/client_server/latest#get-matrix-client-r0-joined-rooms)
+- [x] [10.4.3.1 POST /_matrix/client/r0/rooms/{roomId}/leave](https://matrix.org/docs/spec/client_server/latest#post-matrix-client-r0-rooms-roomid-leave)
 - [x] [10.5.1 GET /_matrix/client/r0/directory/list/room/{roomId}](https://matrix.org/docs/spec/client_server/latest#get-matrix-client-r0-directory-list-room-roomid)
 - [x] [10.5.2 PUT /_matrix/client/r0/directory/list/room/{roomId}](https://matrix.org/docs/spec/client_server/latest#put-matrix-client-r0-directory-list-room-roomid)
 - [x] [13.10.1.1 GET /_matrix/client/r0/devices](https://matrix.org/docs/spec/client_server/latest#get-matrix-client-r0-devices)

internal/handlers.go

@@ -82,6 +82,41 @@ func LoginHandler(w http.ResponseWriter, r *http.Request) {
 	}
 }
 
+// https://matrix.org/docs/spec/client_server/latest#post-matrix-client-r0-rooms-roomid-leave
+func leaveRoomHandler(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodPost {
+		errorResponse(w, models.M_UNKNOWN, http.StatusBadRequest, "wrong method: "+r.Method)
+		return
+	}
+
+	token := getTokenFromResponse(r)
+
+	if token == "" {
+		errorResponse(w, models.M_MISSING_TOKEN, http.StatusBadRequest, "")
+		return
+	}
+
+	user := currServer.Backend.GetUserByToken(token)
+	if user == nil {
+		errorResponse(w, models.M_UNKNOWN_TOKEN, http.StatusBadRequest, "")
+		return
+	}
+
+	room := currServer.Backend.GetRoomByID(mux.Vars(r)["roomID"]) // TODO: can ["roomID"] throw panic?
+	if room == nil {
+		errorResponse(w, models.M_NOT_FOUND, http.StatusBadRequest, "room not found")
+		return
+	}
+
+	err := user.LeaveRoom(room)
+	if err != nil {
+		errorResponse(w, *err, http.StatusBadRequest, "")
+		return
+	}
+
+	sendJsonResponse(w, http.StatusOK, struct{}{})
+}
+
 // https://models.org/docs/spec/client_server/latest#post-models-client-r0-logout
 func LogoutHandler(w http.ResponseWriter, r *http.Request) {
 	if r.Method != http.MethodPost {

internal/server.go

@@ -37,6 +37,7 @@ func NewServer(port int) (*Server, error) {
 	router.HandleFunc("/_matrix/client/r0/capabilities", CapabilitiesHandler)
 	router.HandleFunc("/_matrix/client/r0/devices", DevicesHandler)
 	router.HandleFunc("/_matrix/client/r0/directory/list/room/{roomID}", listRoomHandler)
+	router.HandleFunc("/_matrix/client/r0/rooms/{roomId}/leave", leaveRoomHandler)
 	router.HandleFunc("/", RootHandler)
 
 	if port <= 0 || port > 65535 {