96 lines
2.9 KiB
Go
96 lines
2.9 KiB
Go
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package validator
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import (
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"errors"
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"fmt"
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"reflect"
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"strings"
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"github.com/gin-gonic/gin/binding"
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validatorlib "github.com/go-playground/validator/v10"
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)
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// FieldError merepresentasikan 1 field DTO yang gagal validasi.
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// Field mengikuti nama di tag `json` DTO (bukan nama struct Go), supaya konsisten
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// dengan nama yang dikirim client di body request.
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type FieldError struct {
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Field string `json:"field"`
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Message string `json:"message"`
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}
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// RegisterJSONTagNameFunc membuat validator Gin melaporkan error pakai nama tag `json`
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// dari DTO (misal "email", "password"), bukan nama struct Go (misal "Email", "Password").
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// WAJIB dipanggil sekali saat startup aplikasi (lihat internal/router/router.go),
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// sebelum ada request yang divalidasi.
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func RegisterJSONTagNameFunc() {
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v, ok := binding.Validator.Engine().(*validatorlib.Validate)
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if !ok {
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return
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}
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v.RegisterTagNameFunc(func(field reflect.StructField) string {
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name := strings.SplitN(field.Tag.Get("json"), ",", 2)[0]
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if name == "-" || name == "" {
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return field.Name
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}
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return name
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})
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}
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func TranslateError(err error) []FieldError {
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var validationErrs validatorlib.ValidationErrors
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if !errors.As(err, &validationErrs) {
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return []FieldError{{
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Field: "body",
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Message: "format request tidak valid, pastikan body berupa JSON yang benar",
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}}
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}
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fieldErrors := make([]FieldError, 0, len(validationErrs))
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for _, fe := range validationErrs {
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fieldErrors = append(fieldErrors, FieldError{
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Field: fe.Field(),
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Message: buildMessage(fe),
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})
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}
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return fieldErrors
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}
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// buildMessage menerjemahkan tag validasi (required, email, min, dst) jadi kalimat
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// Bahasa Indonesia yang jelas. Tambahkan case baru di sini kalau ada tag validasi baru
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// yang dipakai di DTO tapi belum ada terjemahannya.
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func buildMessage(fe validatorlib.FieldError) string {
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field := fe.Field()
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switch fe.Tag() {
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case "required":
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return fmt.Sprintf("%s wajib diisi", field)
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case "email":
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return fmt.Sprintf("%s harus berupa alamat email yang valid", field)
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case "min":
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if fe.Kind() == reflect.String {
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return fmt.Sprintf("%s minimal %s karakter", field, fe.Param())
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}
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return fmt.Sprintf("%s minimal bernilai %s", field, fe.Param())
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case "max":
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if fe.Kind() == reflect.String {
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return fmt.Sprintf("%s maksimal %s karakter", field, fe.Param())
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}
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return fmt.Sprintf("%s maksimal bernilai %s", field, fe.Param())
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case "gte":
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return fmt.Sprintf("%s minimal bernilai %s", field, fe.Param())
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case "lte":
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return fmt.Sprintf("%s maksimal bernilai %s", field, fe.Param())
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case "oneof":
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return fmt.Sprintf("%s harus salah satu dari: %s", field, fe.Param())
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case "len":
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return fmt.Sprintf("%s harus tepat %s karakter", field, fe.Param())
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case "numeric":
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return fmt.Sprintf("%s harus berupa angka", field)
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case "alphanum":
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return fmt.Sprintf("%s hanya boleh berisi huruf dan angka", field)
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default:
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return fmt.Sprintf("%s tidak valid", field)
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}
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}
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