chore: custom validation error messages

internal/api/validator.go

@@ -1,6 +1,7 @@
 package api
 
 import (
+	"fmt"
 	"net/http"
 	"regexp"
 
@@ -12,10 +13,40 @@ type CustomValidator struct {
 	validator *validator.Validate
 }
 
-func (validator *CustomValidator) Validate(i any) error {
-	if err := validator.validator.Struct(i); err != nil {
-		return echo.NewHTTPError(http.StatusBadRequest, err.Error())
+func (v *CustomValidator) Validate(i any) error {
+	if err := v.validator.Struct(i); err != nil {
+		if validationErrors, ok := err.(validator.ValidationErrors); ok {
+			errors := make(map[string]string)
+
+			for _, ve := range validationErrors {
+				field := ve.Field()
+				tag := ve.Tag()
+
+				var msg string
+
+				switch tag {
+				case "required":
+					msg = fmt.Sprintf("%s is required!", field)
+				case "email":
+					msg = fmt.Sprintf("%s must be a valid email!", field)
+				case "alpha":
+					msg = fmt.Sprintf("%s must only contain alphabetic characters!", field)
+				case "e164":
+					msg = fmt.Sprintf("%s must be a valid phone number in e164 format!", field)
+				case "password":
+					msg = fmt.Sprintf("%s must have at lease one uppercase, one lowercase, one number and one special character!", field)
+				case "eqcsfield":
+					msg = fmt.Sprintf("%s must be the same as %s!", field, ve.Param())
+				default:
+					msg = fmt.Sprintf("%s is not valid!", field)
+				}
+
+				errors[field] = msg
+			}
+			return echo.NewHTTPError(http.StatusBadRequest, errors)
+		}
 	}
+
 	return nil
 }