[feature/backend] update put /users/me endpoint, allow setting username and display name

backend/internal/handler/user.go

@@ -11,6 +11,7 @@ import (
 )
 
 type UpdateCurrentUserRequest struct {
+	Username        string `json:"username,omitempty" binding:"omitempty,min=3,max=32"`
 	Email           string `json:"email,omitempty" binding:"omitempty,email"`
 	CurrentPassword string `json:"current_password,omitempty"`
 	NewPassword     string `json:"new_password,omitempty" binding:"omitempty,min=8"`
@@ -211,12 +212,20 @@ func (h *Handler) GetCurrentUser(c *gin.Context) {
 // UpdateCurrentUser updates the current user's information
 func (h *Handler) UpdateCurrentUser(c *gin.Context) {
 	// 从上下文中获取用户ID（由认证中间件设置）
-	userID, exists := c.Get("user_id")
+	userIDStr, exists := c.Get("user_id")
 	if !exists {
 		c.JSON(http.StatusUnauthorized, gin.H{"error": "Unauthorized"})
 		return
 	}
 
+	// 将用户ID转换为整数
+	userID, err := strconv.Atoi(userIDStr.(string))
+	if err != nil {
+		log.Error().Err(err).Msg("Failed to convert user ID to integer")
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "Invalid user ID format"})
+		return
+	}
+
 	var req UpdateCurrentUserRequest
 	if err := c.ShouldBindJSON(&req); err != nil {
 		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
@@ -231,20 +240,25 @@ func (h *Handler) UpdateCurrentUser(c *gin.Context) {
 		}
 
 		// 验证当前密码
-		if err := h.service.VerifyPassword(c.Request.Context(), userID.(int), req.CurrentPassword); err != nil {
+		if err := h.service.VerifyPassword(c.Request.Context(), userID, req.CurrentPassword); err != nil {
 			c.JSON(http.StatusUnauthorized, gin.H{"error": "Invalid current password"})
 			return
 		}
 	}
 
 	// 更新用户信息
-	user, err := h.service.UpdateUser(c.Request.Context(), userID.(int), &types.UpdateUserInput{
+	user, err := h.service.UpdateUser(c.Request.Context(), userID, &types.UpdateUserInput{
+		Username:    req.Username,
 		Email:       req.Email,
 		Password:    req.NewPassword,
 		DisplayName: req.DisplayName,
 	})
 	if err != nil {
 		log.Error().Err(err).Msg("Failed to update user")
+		if err.Error() == "username already taken" {
+			c.JSON(http.StatusConflict, gin.H{"error": "Username already taken"})
+			return
+		}
 		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to update user information"})
 		return
 	}