refactor: use dtos in controllers

backend/internal/utils/controller_error_util.go

@@ -0,0 +1,75 @@
+package utils
+
+import (
+	"errors"
+	"github.com/gin-gonic/gin"
+	"github.com/go-playground/validator/v10"
+	"gorm.io/gorm"
+	"log"
+	"net/http"
+	"strings"
+)
+
+import (
+	"fmt"
+)
+
+func ControllerError(c *gin.Context, err error) {
+	// Check for record not found errors
+	if errors.Is(err, gorm.ErrRecordNotFound) {
+		CustomControllerError(c, http.StatusNotFound, "Record not found")
+		return
+	}
+
+	// Check for validation errors
+	var validationErrors validator.ValidationErrors
+	if errors.As(err, &validationErrors) {
+		message := handleValidationError(validationErrors)
+		CustomControllerError(c, http.StatusBadRequest, message)
+		return
+
+	}
+
+	log.Println(err)
+	c.JSON(http.StatusInternalServerError, gin.H{"error": "Something went wrong"})
+}
+
+func handleValidationError(validationErrors validator.ValidationErrors) string {
+	var errorMessages []string
+
+	for _, ve := range validationErrors {
+		fieldName := ve.Field()
+		var errorMessage string
+		switch ve.Tag() {
+		case "required":
+			errorMessage = fmt.Sprintf("%s is required", fieldName)
+		case "email":
+			errorMessage = fmt.Sprintf("%s must be a valid email address", fieldName)
+		case "username":
+			errorMessage = fmt.Sprintf("%s must contain only lowercase letters, numbers, and underscores", fieldName)
+		case "url":
+			errorMessage = fmt.Sprintf("%s must be a valid URL", fieldName)
+		case "min":
+			errorMessage = fmt.Sprintf("%s must be at least %s characters long", fieldName, ve.Param())
+		case "max":
+			errorMessage = fmt.Sprintf("%s must be at most %s characters long", fieldName, ve.Param())
+		case "urlList":
+			errorMessage = fmt.Sprintf("%s must be a list of valid URLs", fieldName)
+		default:
+			errorMessage = fmt.Sprintf("%s is invalid", fieldName)
+		}
+		
+		errorMessages = append(errorMessages, errorMessage)
+	}
+
+	// Join all the error messages into a single string
+	combinedErrors := strings.Join(errorMessages, ", ")
+
+	return combinedErrors
+}
+
+func CustomControllerError(c *gin.Context, statusCode int, message string) {
+	// Capitalize the first letter of the message
+	message = strings.ToUpper(message[:1]) + message[1:]
+	c.JSON(statusCode, gin.H{"error": message})
+}

backend/internal/utils/handler_error_util.go

@@ -1,27 +0,0 @@
-package utils
-
-import (
-	"errors"
-	"github.com/gin-gonic/gin"
-	"gorm.io/gorm"
-	"log"
-	"net/http"
-	"strings"
-)
-
-func UnknownHandlerError(c *gin.Context, err error) {
-	if errors.Is(err, gorm.ErrRecordNotFound) {
-		HandlerError(c, http.StatusNotFound, "Record not found")
-		return
-	} else {
-		log.Println(err)
-		c.JSON(http.StatusInternalServerError, gin.H{"error": "Something went wrong"})
-	}
-
-}
-
-func HandlerError(c *gin.Context, statusCode int, message string) {
-	// Capitalize the first letter of the message
-	message = strings.ToUpper(message[:1]) + message[1:]
-	c.JSON(statusCode, gin.H{"error": message})
-}