80 lines
1.9 KiB
Go
80 lines
1.9 KiB
Go
// Copyright 2014 Manu Martinez-Almeida. All rights reserved.
|
|
// Use of this source code is governed by a MIT style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package binding
|
|
|
|
import (
|
|
"errors"
|
|
"reflect"
|
|
"strings"
|
|
)
|
|
|
|
func Validate(obj interface{}) error {
|
|
return validate(obj, "{{ROOT}}")
|
|
}
|
|
|
|
func validate(obj interface{}, parent string) error {
|
|
typ, val := inspectObject(obj)
|
|
switch typ.Kind() {
|
|
case reflect.Struct:
|
|
return validateStruct(typ, val, parent)
|
|
|
|
case reflect.Slice:
|
|
return validateSlice(typ, val, parent)
|
|
|
|
default:
|
|
return errors.New("The object is not a slice or struct.")
|
|
}
|
|
}
|
|
|
|
func inspectObject(obj interface{}) (typ reflect.Type, val reflect.Value) {
|
|
typ = reflect.TypeOf(obj)
|
|
val = reflect.ValueOf(obj)
|
|
if typ.Kind() == reflect.Ptr {
|
|
typ = typ.Elem()
|
|
val = val.Elem()
|
|
}
|
|
return
|
|
}
|
|
|
|
func validateSlice(typ reflect.Type, val reflect.Value, parent string) error {
|
|
if typ.Elem().Kind() == reflect.Struct {
|
|
for i := 0; i < val.Len(); i++ {
|
|
itemValue := val.Index(i).Interface()
|
|
if err := validate(itemValue, parent); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func validateStruct(typ reflect.Type, val reflect.Value, parent string) error {
|
|
for i := 0; i < typ.NumField(); i++ {
|
|
field := typ.Field(i)
|
|
// Allow ignored and unexported fields in the struct
|
|
// TODO should include || field.Tag.Get("form") == "-"
|
|
if len(field.PkgPath) > 0 {
|
|
continue
|
|
}
|
|
|
|
fieldValue := val.Field(i).Interface()
|
|
requiredField := strings.Index(field.Tag.Get("binding"), "required") > -1
|
|
|
|
if requiredField {
|
|
zero := reflect.Zero(field.Type).Interface()
|
|
if reflect.DeepEqual(zero, fieldValue) {
|
|
return errors.New("Required " + field.Name + " in " + parent)
|
|
}
|
|
}
|
|
fieldType := field.Type.Kind()
|
|
if fieldType == reflect.Struct || fieldType == reflect.Slice {
|
|
if err := validate(fieldValue, field.Name); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
}
|
|
return nil
|
|
}
|