98 lines
2.3 KiB
Go
98 lines
2.3 KiB
Go
// Copyright 2017 Manu Martinez-Almeida. All rights reserved.
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// Use of this source code is governed by a MIT style
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// license that can be found in the LICENSE file.
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package binding
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import (
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"fmt"
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"reflect"
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"strings"
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"sync"
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"github.com/go-playground/validator/v10"
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)
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type defaultValidator struct {
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once sync.Once
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validate *validator.Validate
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}
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type SliceValidationError []error
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// Error concatenates all error elements in SliceValidationError into a single string separated by \n.
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func (err SliceValidationError) Error() string {
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n := len(err)
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switch n {
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case 0:
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return ""
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default:
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var b strings.Builder
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if err[0] != nil {
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fmt.Fprintf(&b, "[%d]: %s", 0, err[0].Error())
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}
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if n > 1 {
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for i := 1; i < n; i++ {
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if err[i] != nil {
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b.WriteString("\n")
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fmt.Fprintf(&b, "[%d]: %s", i, err[i].Error())
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}
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}
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}
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return b.String()
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}
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}
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var _ StructValidator = &defaultValidator{}
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// ValidateStruct receives any kind of type, but only performed struct or pointer to struct type.
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func (v *defaultValidator) ValidateStruct(obj interface{}) error {
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if obj == nil {
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return nil
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}
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value := reflect.ValueOf(obj)
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switch value.Kind() {
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case reflect.Ptr:
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return v.ValidateStruct(value.Elem().Interface())
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case reflect.Struct:
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return v.validateStruct(obj)
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case reflect.Slice, reflect.Array:
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count := value.Len()
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validateRet := make(SliceValidationError, 0)
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for i := 0; i < count; i++ {
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if err := v.ValidateStruct(value.Index(i).Interface()); err != nil {
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validateRet = append(validateRet, err)
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}
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}
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if len(validateRet) == 0 {
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return nil
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}
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return validateRet
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default:
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return nil
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}
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}
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// validateStruct receives struct type
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func (v *defaultValidator) validateStruct(obj interface{}) error {
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v.lazyinit()
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return v.validate.Struct(obj)
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}
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// Engine returns the underlying validator engine which powers the default
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// Validator instance. This is useful if you want to register custom validations
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// or struct level validations. See validator GoDoc for more info -
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// https://pkg.go.dev/github.com/go-playground/validator/v10
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func (v *defaultValidator) Engine() interface{} {
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v.lazyinit()
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return v.validate
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}
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func (v *defaultValidator) lazyinit() {
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v.once.Do(func() {
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v.validate = validator.New()
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v.validate.SetTagName("binding")
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})
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}
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