forked from mirror/gin
80 lines
1.9 KiB
Go
80 lines
1.9 KiB
Go
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// Copyright 2014 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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"errors"
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"reflect"
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"strings"
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)
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func Validate(obj interface{}) error {
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return validate(obj, "{{ROOT}}")
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}
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func validate(obj interface{}, parent string) error {
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typ, val := inspectObject(obj)
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switch typ.Kind() {
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case reflect.Struct:
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return validateStruct(typ, val, parent)
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case reflect.Slice:
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return validateSlice(typ, val, parent)
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default:
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return errors.New("The object is not a slice or struct.")
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}
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}
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func inspectObject(obj interface{}) (typ reflect.Type, val reflect.Value) {
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typ = reflect.TypeOf(obj)
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val = reflect.ValueOf(obj)
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if typ.Kind() == reflect.Ptr {
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typ = typ.Elem()
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val = val.Elem()
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}
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return
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}
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func validateSlice(typ reflect.Type, val reflect.Value, parent string) error {
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if typ.Elem().Kind() == reflect.Struct {
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for i := 0; i < val.Len(); i++ {
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itemValue := val.Index(i).Interface()
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if err := validate(itemValue, parent); err != nil {
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return err
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}
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}
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}
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return nil
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}
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func validateStruct(typ reflect.Type, val reflect.Value, parent string) error {
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for i := 0; i < typ.NumField(); i++ {
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field := typ.Field(i)
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// Allow ignored and unexported fields in the struct
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// TODO should include || field.Tag.Get("form") == "-"
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if len(field.PkgPath) > 0 {
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continue
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}
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fieldValue := val.Field(i).Interface()
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requiredField := strings.Index(field.Tag.Get("binding"), "required") > -1
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if requiredField {
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zero := reflect.Zero(field.Type).Interface()
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if reflect.DeepEqual(zero, fieldValue) {
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return errors.New("Required " + field.Name + " in " + parent)
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}
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}
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fieldType := field.Type.Kind()
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if fieldType == reflect.Struct || fieldType == reflect.Slice {
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if err := validate(fieldValue, field.Name); err != nil {
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return err
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}
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}
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}
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return nil
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}
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