/
validator.go
240 lines (198 loc) · 6.56 KB
/
validator.go
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package validator
import (
"fmt"
"reflect"
"strings"
"github.com/go-playground/validator/v10"
"go.uber.org/zap"
ut "github.com/go-playground/universal-translator"
"github.com/go-playground/validator/v10/translations/en"
"github.com/go-playground/validator/v10/translations/ru"
"github.com/pkg/errors"
)
type registrar struct {
validator *validator.Validate
translator *ut.UniversalTranslator
}
func (r *registrar) configure(logger *zap.Logger) error {
r.validator.RegisterTagNameFunc(func(fld reflect.StructField) string {
name := strings.SplitN(fld.Tag.Get("json"), ",", 2)[0]
if name == "-" {
return ""
}
return name
})
if err := r.registerDefaultTranslations(logger); err != nil {
return errors.Wrapf(err, "failed to register default translations")
}
if err := r.overrideDefaultTranslations(logger); err != nil {
return errors.Wrapf(err, "failed to override default translations")
}
if err := r.registerCustomValidations(logger); err != nil {
return errors.Wrapf(err, "failed to register custom validations")
}
if err := r.registerAliases(logger); err != nil {
return errors.Wrapf(err, "failed to register aliases")
}
return nil
}
type translation struct {
translation string
customRegisFunc validator.RegisterTranslationsFunc
customTransFunc validator.TranslationFunc
override bool
}
type translations map[string]translation
type TranslatorNotFoundError struct {
Locale string
}
func (e *TranslatorNotFoundError) Error() string {
return fmt.Sprintf("translator for %q locale not found", e.Locale)
}
func (r *registrar) registerDefaultTranslations(logger *zap.Logger) error {
for locale, recorder := range map[string]func(validator *validator.Validate, translator ut.Translator) error{
"en": en.RegisterDefaultTranslations,
"ru": ru.RegisterDefaultTranslations,
} {
logger.Debug("registering default translations",
zap.String("locale", locale),
)
translator, found := unitrans.GetTranslator(locale)
if !found {
return &TranslatorNotFoundError{Locale: locale}
}
if err := recorder(r.validator, translator); err != nil {
return errors.Wrapf(err, "failed to register %q locale default translations", locale)
}
}
return nil
}
func (r *registrar) overrideDefaultTranslations(logger *zap.Logger) error {
for tag, translations := range map[string]translations{} {
logger.Debug("overriding default translations",
zap.String("tag", tag),
)
if err := r.registerTranslations(logger, tag, translations); err != nil {
return errors.Wrapf(err, "failed to override %q tag translations", tag)
}
}
return nil
}
func (r *registrar) registerCustomValidations(logger *zap.Logger) error {
for tag, st := range map[string]struct {
validationFn validator.Func
translations translations
}{
"username": {
validationFn: usernameValidation,
translations: translations{
"en": {
translation: "{0} must begin with a letter and contain only letters, underscores, numbers and has length 5 to 32 characters",
override: false,
},
"ru": {
translation: "{0} должно начинаться с буквы и содержать только буквы, нижние подчеркивания, цифры и иметь длину от 5 до 32 символов",
override: false,
},
},
},
"password": {
validationFn: passwordValidation,
translations: translations{
"en": {
translation: "{0} must contain uppercase and lowercase letters, digits, special characters and has length 8 to 64 characters",
override: false,
},
"ru": {
translation: "{0} должен содержать заглавные и строчные буквы, цифры, специальные символы и иметь длину от 8 до 64 символов",
override: false,
},
},
},
} {
logger.Debug("registering custom validation",
zap.String("tag", tag),
)
if err := r.validator.RegisterValidation(tag, st.validationFn); err != nil {
return errors.Wrapf(err, "failed to register custom %q tag validation", tag)
}
logger.Debug("registering translations",
zap.String("tag", tag),
)
if err := r.registerTranslations(logger, tag, st.translations); err != nil {
return errors.Wrapf(err, "failed to register custom %q tag translations", tag)
}
}
return nil
}
func (r *registrar) registerAliases(logger *zap.Logger) error {
for alias, st := range map[string]struct {
tags string
translations translations
}{
"login": {
tags: "username|email",
translations: translations{
"en": {
translation: "{0} must be a valid username or email address",
override: false,
},
"ru": {
translation: "{0} должен быть действительным именем пользователя или адресом электронной почты",
override: false,
},
},
},
} {
logger.Debug("registering alias",
zap.String("alias", alias),
zap.String("tags", st.tags),
)
r.validator.RegisterAlias(alias, st.tags)
logger.Debug("registering translations",
zap.String("tag", alias),
)
if err := r.registerTranslations(logger, alias, st.translations); err != nil {
return errors.Wrapf(err, "failed to register %q alias translations", alias)
}
}
return nil
}
func (r *registrar) registerTranslations(logger *zap.Logger, tag string, translations translations) error {
for locale, t := range translations {
translator, found := unitrans.GetTranslator(locale)
if !found {
return &TranslatorNotFoundError{Locale: locale}
}
regisFunc := t.customRegisFunc
if t.customRegisFunc == nil {
regisFunc = registrationFunc(tag, t.translation, t.override)
}
transFunc := t.customTransFunc
if t.customTransFunc == nil {
transFunc = translateFunc(logger)
}
err := r.validator.RegisterTranslation(tag, translator, regisFunc, transFunc)
if err != nil {
return errors.Wrapf(err, "failed to register %q tag translation in %q locale", tag, locale)
}
}
return nil
}
func registrationFunc(tag, translation string, override bool) validator.RegisterTranslationsFunc {
return func(translator ut.Translator) error {
return translator.Add(tag, translation, override)
}
}
func translateFunc(logger *zap.Logger) func(ut.Translator, validator.FieldError) string {
return func(translator ut.Translator, fieldError validator.FieldError) string {
translation, err := translator.T(fieldError.Tag(), fieldError.Field())
if err != nil {
logger.Warn("failed to translate FieldError",
zap.Error(fieldError),
)
return fieldError.(error).Error()
}
return translation
}
}