Init

pkg/validator/validator.go

@@ -0,0 +1,82 @@
+package validator
+
+import (
+	"errors"
+	"reflect"
+	"strings"
+
+	"github.com/go-playground/validator/v10"
+	"github.com/gofiber/fiber/v3"
+)
+
+var validate = validator.New()
+
+func init() {
+	validate.RegisterTagNameFunc(func(fld reflect.StructField) string {
+		name := strings.SplitN(fld.Tag.Get("json"), ",", 2)[0]
+		if name == "-" {
+			return ""
+		}
+		if name == "" {
+			name = strings.SplitN(fld.Tag.Get("query"), ",", 2)[0]
+		}
+		return name
+	})
+}
+
+type ErrorResponse struct {
+	FailedField string `json:"failed_field"`
+	Tag         string `json:"tag"`
+	Value       string `json:"value"`
+	Message     string `json:"message"`
+}
+
+func formatValidationError(err error) []ErrorResponse {
+	var validationErrors validator.ValidationErrors
+	var errorsList []ErrorResponse
+
+	if errors.As(err, &validationErrors) {
+		for _, fieldError := range validationErrors {
+			var element ErrorResponse
+			element.FailedField = fieldError.Field()
+			element.Tag = fieldError.Tag()
+			element.Value = fieldError.Param()
+			element.Message = "Field " + fieldError.Field() + " failed validation on tag '" + fieldError.Tag() + "'"
+			
+			errorsList = append(errorsList, element)
+		}
+	}
+	return errorsList
+}
+
+func ValidateQueryDto(c fiber.Ctx, dto any) error {
+	if err := c.Bind().Query(dto); err != nil {
+		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{
+			"error": "Failed to parse query parameters: " + err.Error(),
+		})
+	}
+
+	if err := validate.Struct(dto); err != nil {
+		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{
+			"errors": formatValidationError(err),
+		})
+	}
+
+	return nil
+}
+
+func ValidateBodyDto(c fiber.Ctx, dto any) error {
+	if err := c.Bind().Body(dto); err != nil {
+		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{
+			"error": "Invalid request body: " + err.Error(),
+		})
+	}
+
+	if err := validate.Struct(dto); err != nil {
+		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{
+			"errors": formatValidationError(err),
+		})
+	}
+
+	return nil
+}