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validation.go
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validation.go
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package goutil
import (
"reflect"
"regexp"
"strings"
"github.com/go-playground/locales/en"
ut "github.com/go-playground/universal-translator"
"github.com/go-playground/validator/v10"
en_translations "github.com/go-playground/validator/v10/translations/en"
)
type Validation struct {
v *validator.Validate
trans *ut.Translator
}
func NewValidation() (Validation, error) {
// translator
en := en.New()
uni := ut.New(en, en)
// register translator
trans, _ := uni.GetTranslator("en")
validate := validator.New()
en_translations.RegisterDefaultTranslations(validate, trans)
// send validate connection
return Validation{validate, &trans}, nil
}
type ValidationErrors struct {
Errors []ValidationError `json:"errors"`
}
type ValidationError struct {
Field string `json:"field"`
Message string `json:"message"`
}
func (v ValidationErrors) IsErrorExists() bool {
return len(v.Errors) > 0
}
func (vt *Validation) ValidationStruct(req interface{}) (validationError ValidationErrors) {
if err := vt.v.Struct(req); err != nil {
for _, errs := range err.(validator.ValidationErrors) {
field, _ := reflect.TypeOf(req).FieldByName(errs.Field())
filedJSONName, _ := field.Tag.Lookup("json")
validationError.Errors = append(validationError.Errors, ValidationError{
Field: filedJSONName,
Message: strings.Replace(errs.Translate(*vt.trans), errs.Field(), filedJSONName, -1),
})
}
}
return
}
func (vt *Validation) ValidationVariable(req interface{}, tag string, msgErr string) (validationError ValidationErrors) {
if err := vt.v.Var(req, tag); err != nil {
validationError.Errors = append(validationError.Errors, ValidationError{
Field: tag,
Message: msgErr,
})
}
return
}
type RegisterTranslation func(v *validator.Validate, trans *ut.Translator) error
func (vt *Validation) RegisterTranslation(translations ...RegisterTranslation) (err error) {
registerJPG := func(ut ut.Translator) error { return ut.Add("jpg", "{0} must be a valid format", true) }
translationJPG := func(ut ut.Translator, fe validator.FieldError) string {
t, _ := ut.T("jpg", fe.Field())
return t
}
err = vt.v.RegisterTranslation("jpg", *vt.trans, registerJPG, translationJPG)
if err != nil {
return err
}
registerPNG := func(ut ut.Translator) error { return ut.Add("png", "{0} must be a valid format", true) }
translationPNG := func(ut ut.Translator, fe validator.FieldError) string {
t, _ := ut.T("png", fe.Field())
return t
}
err = vt.v.RegisterTranslation("png", *vt.trans, registerPNG, translationPNG)
if err != nil {
return err
}
registerPDF := func(ut ut.Translator) error { return ut.Add("pdf", "{0} must be a valid format", true) }
translationPDF := func(ut ut.Translator, fe validator.FieldError) string {
t, _ := ut.T("pdf", fe.Field())
return t
}
err = vt.v.RegisterTranslation("pdf", *vt.trans, registerPDF, translationPDF)
if err != nil {
return err
}
for _, transFunc := range translations {
err = transFunc(vt.v, vt.trans)
if err != nil {
return err
}
}
return nil
}
type RegisterValidation func(v *validator.Validate) error
func (vt *Validation) RegisterValidation(validations ...RegisterValidation) (err error) {
validatorJPG := func(fl validator.FieldLevel) bool {
charValidation := regexp.MustCompile(`^.(jpg|jpeg|JPG|JPEG)$`)
return charValidation.MatchString(fl.Field().String())
}
err = vt.v.RegisterValidation("jpg", validatorJPG)
if err != nil {
return err
}
validatorPNG := func(fl validator.FieldLevel) bool {
charValidation := regexp.MustCompile(`^.(png|PNG)$`)
return charValidation.MatchString(fl.Field().String())
}
err = vt.v.RegisterValidation("png", validatorPNG)
if err != nil {
return err
}
validatorPDF := func(fl validator.FieldLevel) bool {
charValidation := regexp.MustCompile(`^.(pdf|PDF)$`)
return charValidation.MatchString(fl.Field().String())
}
err = vt.v.RegisterValidation("pdf", validatorPDF)
if err != nil {
return err
}
for _, validateFunc := range validations {
err = validateFunc(vt.v)
if err != nil {
return err
}
}
return nil
}