Update backend

internal/handlers/request/validator.go

@@ -0,0 +1,50 @@
+package request
+
+import (
+	errors2 "errors"
+	"github.com/go-playground/validator/v10"
+	"reflect"
+)
+
+var validate *validator.Validate
+
+func ValidateAndHandleError(req interface{}) error {
+	validate = validator.New()
+
+	if err := validate.Struct(req); err != nil {
+		formattedError := formatValidationError(err)
+		return errors2.New(formattedError)
+	}
+	return nil
+}
+
+func formatValidationError(err error) string {
+	if _, ok := err.(*validator.InvalidValidationError); ok {
+		return err.Error()
+	}
+
+	var errorMessage string
+	for _, err := range err.(validator.ValidationErrors) {
+		switch err.Tag() {
+		case "required":
+			errorMessage += "The field '" + err.Field() + "' is required."
+		case "min":
+			if err.Kind() == reflect.Slice {
+				errorMessage += "The field '" + err.Field() + "' must contain at least " + err.Param() + " items."
+			} else {
+				errorMessage += "The field '" + err.Field() + "' must be at least " + err.Param() + "."
+			}
+		case "oneof":
+			errorMessage += "The field '" + err.Field() + "' must be one of [" + err.Param() + "]."
+		case "email":
+			errorMessage += "The field '" + err.Field() + "' must be a valid email address."
+		case "len":
+			errorMessage += "The field '" + err.Field() + "' must be exactly " + err.Param() + " characters long."
+		default:
+			errorMessage += "The field '" + err.Field() + "' is invalid."
+		}
+		errorMessage += " "
+	}
+
+	return errorMessage
+}