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validate.go
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validate.go
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// Package validate contains the support for validating models.
package validate
import (
"reflect"
"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"
)
// validate holds the settings and caches for validating request struct values.
var validate *validator.Validate
// translator is a cache of locale and translation information.
var translator ut.Translator
func init() {
// Instantiate a validator.
validate = validator.New()
// Create a translator for english so the error messages are
// more human-readable than technical.
translator, _ = ut.New(en.New(), en.New()).GetTranslator("en")
// Register the english error messages for use.
en_translations.RegisterDefaultTranslations(validate, translator)
// Use JSON tag names for errors instead of Go struct names.
validate.RegisterTagNameFunc(func(fld reflect.StructField) string {
name := strings.SplitN(fld.Tag.Get("json"), ",", 2)[0]
if name == "-" {
return ""
}
return name
})
}
// Check validates the provided model against it's declared tags.
func Check(val any) error {
if err := validate.Struct(val); err != nil {
// Use a type assertion to get the real error value.
verrors, ok := err.(validator.ValidationErrors)
if !ok {
return err
}
var fields FieldErrors
for _, verror := range verrors {
field := FieldError{
Field: verror.Field(),
Err: verror.Translate(translator),
}
fields = append(fields, field)
}
return fields
}
return nil
}