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validation.go
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validation.go
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// SPDX-License-Identifier: AGPL-3.0-only
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published
// by the Free Software Foundation, version 3.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
// See the GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>
package common
import (
"errors"
"net/http"
"reflect"
"strings"
"github.com/go-playground/locales/en"
"github.com/go-playground/locales/zh"
ut "github.com/go-playground/universal-translator"
"github.com/go-playground/validator/v10"
zhTranslations "github.com/go-playground/validator/v10/translations/zh"
"github.com/gofiber/fiber/v2"
"github.com/bangumi/server/internal/pkg/errgo"
"github.com/bangumi/server/internal/web/res"
)
func (h Common) ValidationError(c *fiber.Ctx, err error) error {
return res.JSON(c.Status(http.StatusBadRequest), res.Error{
Title: "Bad Request",
Description: "can't validate request body",
Details: h.translationValidationError(err),
})
}
func (h Common) translationValidationError(err error) []string {
var validationErrors validator.ValidationErrors
if ok := errors.As(err, &validationErrors); ok {
var details = make([]string, len(validationErrors))
for i, e := range validationErrors {
// can translate each error one at a time.
details[i] = e.Translate(h.validatorTranslation)
}
return details
}
return []string{err.Error()}
}
var errTranslationNotFound = errors.New("failed to find translation for zh")
func getValidator() (*validator.Validate, ut.Translator, error) {
validate := validator.New()
uni := ut.New(en.New(), zh.New())
// this is usually know or extracted from http 'Accept-Language' header
// also see uni.FindTranslator(...)
trans, found := uni.GetTranslator(zh.New().Locale())
if !found {
return nil, nil, errTranslationNotFound
}
err := zhTranslations.RegisterDefaultTranslations(validate, trans)
if err != nil {
return nil, nil, errgo.Wrap(err, "failed to register translation")
}
validate.RegisterTagNameFunc(func(field reflect.StructField) string {
docName := field.Tag.Get("validateName")
if docName != "" {
return docName
}
tag := field.Tag.Get("json")
if tag == "" {
return field.Name
}
name := strings.SplitN(tag, ",", 2)[0]
if name == "-" {
return ""
}
return name
})
return validate, trans, nil
}