echo_validation.go

package validation

import (
	"fmt"
	"reflect"
	"strings"

	validatorP "gopkg.in/go-playground/validator.v9"
)

// CustomValidator to validate request
type CustomValidator struct {
	ValidatorX *validatorP.Validate
}

//NewValidator add more func
func NewValidator() *validatorP.Validate {
	validate := validatorP.New()
	validate.RegisterTagNameFunc(func(fld reflect.StructField) string {
		name := strings.SplitN(fld.Tag.Get("json"), ",", 2)[0]
		if name == "-" {
			return ""
		}
		return name
	})
	return validate
}

//Validate run validate request
func (cv *CustomValidator) Validate(i interface{}) error {
	errV := cv.ValidatorX.Struct(i)
	if errV != nil {
		var tmpErr []string
		for _, err := range errV.(validatorP.ValidationErrors) {
			tmpErr = append(tmpErr, fmt.Sprintf("Field validation for '%s' failed on the '%s'", err.Field(), err.ActualTag()))
		}
		return (fmt.Errorf("%s", strings.Join(tmpErr, "\n")))
	}

	return errV
}