Allow short names

frontend/src/components/loginForm.tsx

@@ -32,6 +32,7 @@ export interface LoginFormProps {
     errorMessage?: string;
 }
 
+// Sync rules with protocol.go.
 export function LoginForm(props: LoginFormProps) {
     const classes = useStyles();
     const { control, handleSubmit, errors, setValue, register } = useForm<LoginFormData>({});
@@ -54,7 +55,7 @@ export function LoginForm(props: LoginFormProps) {
                     label="Nickname"
                     defaultValue=""
                     error={!!errors.nickname}
-                    rules={{ required: true, minLength: 3, maxLength: 16 }}
+                    rules={{ required: true, minLength: 1, maxLength: 16 }}
                     fullWidth={true}
                     inputProps={noComplete}
                     autoFocus
@@ -71,7 +72,7 @@ export function LoginForm(props: LoginFormProps) {
                             label="Room name"
                             defaultValue=""
                             error={!!errors.roomName}
-                            rules={{ required: true, minLength: 3, maxLength: 16 }}
+                            rules={{ required: true, minLength: 1, maxLength: 20 }}
                             fullWidth={true}
                             inputProps={noComplete}
                         />

internal/protocol/protocol.go

@@ -23,16 +23,20 @@ type RoomRequest struct {
 	Create   bool   `json:"create"`
 }
 
-func (r *RoomRequest) Valid() bool {
-	if len(r.RoomName) < 3 || len(r.RoomName) > 16 {
-		return false
+func (r *RoomRequest) Valid() (msg string, valid bool) {
+	if len(r.RoomName) == 0 {
+		return "Room name cannot be empty.", false
+	}
+
+	if len(r.RoomName) > 20 {
+		return "Room name too long.", false
 	}
 
 	if len(r.RoomPass) == 0 {
-		return false
+		return "Room pass cannot be empty.", false
 	}
 
-	return true
+	return "", true
 }
 
 //easyjson:json
@@ -58,20 +62,24 @@ type WSQuery struct {
 	Nickname string    `queryparam:"nickname"`
 }
 
-func (w *WSQuery) Valid() bool {
+func (w *WSQuery) Valid() (msg string, valid bool) {
 	if w.RoomID == "" {
-		return false
+		return "Room ID cannot be empty.", false
 	}
 
 	if w.PlayerID == uuid.Nil {
-		return false
+		return "Player ID cannot be empty", false
 	}
 
-	if len(w.Nickname) < 3 || len(w.Nickname) > 16 {
-		return false
+	if len(w.Nickname) == 0 {
+		return "Nickname cannot be empty.", false
 	}
 
-	return true
+	if len(w.Nickname) > 16 {
+		return "Nickname too long.", false
+	}
+
+	return "", true
 }
 
 //easyjson:json

internal/server/server.go

@@ -370,7 +370,7 @@ func (r *Room) handleNote(playerID game.PlayerID, note *protocol.ClientNote) err
 		}
 
 		// Sync with protocol.go's validation method.
-		if len(params.Nickname) < 3 || len(params.Nickname) > 16 {
+		if len(params.Nickname) == 0 || len(params.Nickname) > 16 {
 			return nil
 		}
 

main.go

@@ -128,15 +128,19 @@ func main() {
 					return
 				}
 
-				if !req.Valid() {
-					httpErr(w, http.StatusBadRequest)
+				w.Header().Add("Content-Type", "application/json")
+
+				if msg, valid := req.Valid(); !valid {
+					resp := &protocol.RoomResponse{
+						Error: stringPtr(msg),
+					}
+					w.WriteHeader(http.StatusBadRequest)
+					_ = json.NewEncoder(w).Encode(resp)
 					return
 				}
 
 				resp := &protocol.RoomResponse{}
 
-				w.Header().Add("Content-Type", "application/json")
-
 				if req.Create {
 					room, err := srv.CreateRoom(req.RoomName, req.RoomPass)
 					if err != nil {
@@ -176,7 +180,7 @@ func main() {
 					return
 				}
 
-				if !query.Valid() {
+				if _, valid := query.Valid(); !valid {
 					httpErr(w, http.StatusBadRequest)
 					return
 				}