feat: add check username endpoint

Author: ainunns

controller/user_controller.go

@@ -16,6 +16,7 @@ type (
 		Me(ctx *gin.Context)
 		GetUserByUsername(ctx *gin.Context)
 		UpdateUser(ctx *gin.Context)
+		CheckUsername(ctx *gin.Context)
 	}
 
 	userController struct {
@@ -119,3 +120,22 @@ func (c *userController) UpdateUser(ctx *gin.Context) {
 	res := utils.BuildResponseSuccess(dto.MESSAGE_SUCCESS_UPDATE_USER, result)
 	ctx.JSON(http.StatusOK, res)
 }
+
+func (c *userController) CheckUsername(ctx *gin.Context) {
+	var username dto.CheckUsernameRequest
+	if err := ctx.ShouldBind(&username); err != nil {
+		res := utils.BuildResponseFailed(dto.MESSAGE_FAILED_GET_USER_DATA_FROM_BODY, err.Error(), nil)
+		ctx.AbortWithStatusJSON(http.StatusBadRequest, res)
+		return
+	}
+
+	_, err := c.userService.GetUserByUsername(ctx.Request.Context(), username.UserName)
+	if err != nil && err.Error() == dto.ErrUsernameNotFound.Error() {
+		res := utils.BuildResponseSuccess(dto.MESSAGE_SUCCESS_USERNAME_AVAILABLE, nil)
+		ctx.JSON(http.StatusOK, res)
+		return
+	}
+
+	res := utils.BuildResponseFailed(dto.MESSAGE_FAILED_USERNAME_EXISTS, dto.ErrUsernameAlreadyExists.Error(), nil)
+	ctx.JSON(http.StatusBadRequest, res)
+}

dto/user_dto.go

@@ -16,12 +16,14 @@ const (
 	MESSAGE_FAILED_PROSES_REQUEST          = "failed proses request"
 	MESSAGE_FAILED_DENIED_ACCESS           = "denied access"
 	MESSAGE_FAILED_UPDATE_USER             = "failed update user"
+	MESSAGE_FAILED_USERNAME_EXISTS         = "failed get username"
 
 	// Success
-	MESSAGE_SUCCESS_REGISTER_USER = "success create user"
-	MESSAGE_SUCCESS_GET_USER      = "success get user"
-	MESSAGE_SUCCESS_LOGIN         = "success login"
-	MESSAGE_SUCCESS_UPDATE_USER   = "success update user"
+	MESSAGE_SUCCESS_REGISTER_USER      = "success create user"
+	MESSAGE_SUCCESS_GET_USER           = "success get user"
+	MESSAGE_SUCCESS_LOGIN              = "success login"
+	MESSAGE_SUCCESS_UPDATE_USER        = "success update user"
+	MESSAGE_SUCCESS_USERNAME_AVAILABLE = "username available"
 )
 
 var (
@@ -62,4 +64,8 @@ type (
 	UserLoginResponse struct {
 		Token string `json:"token"`
 	}
+
+	CheckUsernameRequest struct {
+		UserName string `json:"username" form:"username" binding:"required"`
+	}
 )

routes/user_route.go

@@ -18,6 +18,7 @@ func User(route *gin.Engine, injector *do.Injector) {
 		// User
 		routes.POST("/register", userController.Register)
 		routes.POST("/login", userController.Login)
+		routes.POST("/check-username", userController.CheckUsername)
 		routes.GET("/me", middleware.Authenticate(jwtService), userController.Me)
 		routes.GET("/:username", userController.GetUserByUsername)
 		routes.PATCH("/update", middleware.Authenticate(jwtService), userController.UpdateUser)

service/user_service.go

@@ -98,7 +98,7 @@ func (s *userService) Verify(ctx context.Context, req dto.UserLoginRequest) (dto
 func (s *userService) GetUserByUsername(ctx context.Context, username string) (dto.UserResponse, error) {
 	user, _, err := s.userRepo.CheckUsername(ctx, nil, username)
 	if err != nil {
-		return dto.UserResponse{}, dto.ErrGetUserById
+		return dto.UserResponse{}, dto.ErrUsernameNotFound
 	}
 
 	return dto.UserResponse{