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validator.go
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validator.go
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/*
Copyright 2016 Wenhui Shen <www.webx.top>
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package echo
import (
"errors"
"github.com/webx-top/validation"
)
// Validator is the interface that wraps the Validate method.
type Validator interface {
Validate(i interface{}, args ...string) ValidateResult
}
type ValidateResult interface {
Ok() bool
Error() error
Field() string
Raw() interface{}
//setter
SetError(error) ValidateResult
SetField(string) ValidateResult
SetRaw(interface{}) ValidateResult
}
func NewValidateResult() ValidateResult {
return &ValidatorResult{}
}
type ValidatorResult struct {
error
field string
raw interface{}
}
func (v *ValidatorResult) Ok() bool {
return v.error == nil
}
func (v *ValidatorResult) Error() error {
return v.error
}
func (v *ValidatorResult) Field() string {
return v.field
}
func (v *ValidatorResult) Raw() interface{} {
return v.raw
}
func (v *ValidatorResult) SetError(err error) ValidateResult {
v.error = err
return v
}
func (v *ValidatorResult) SetField(field string) ValidateResult {
v.field = field
return v
}
func (v *ValidatorResult) SetRaw(raw interface{}) ValidateResult {
v.raw = raw
return v
}
var (
DefaultNopValidate Validator = &NopValidation{}
defaultValidatorResult = NewValidateResult()
ErrNoSetValidator = errors.New(`The validator is not set`)
)
type NopValidation struct {
}
func (v *NopValidation) Validate(_ interface{}, _ ...string) ValidateResult {
return defaultValidatorResult
}
func NewValidation() Validator {
return &Validation{
validator: validation.New(),
}
}
type Validation struct {
validator *validation.Validation
}
// Validate 此处支持两种用法:
// 1. Validate(表单字段名, 表单值, 验证规则名)
// 2. Validate(结构体实例, 要验证的结构体字段1,要验证的结构体字段2)
// Validate(结构体实例) 代表验证所有带“valid”标签的字段
func (v *Validation) Validate(i interface{}, args ...string) ValidateResult {
e := NewValidateResult()
var err error
switch m := i.(type) {
case string:
field := m
var value, rule string
switch len(args) {
case 2:
rule = args[1]
fallthrough
case 1:
value = args[0]
}
if len(rule) == 0 {
return e
}
_, err = v.validator.ValidSimple(field, value, rule)
default:
_, err = v.validator.Valid(i, args...)
}
if err != nil {
return e.SetError(err)
}
if v.validator.HasError() {
vErr := v.validator.Errors[0]
e.SetError(vErr)
e.SetField(vErr.Field)
e.SetRaw(v.validator.Errors)
v.validator.Errors = nil
}
return e
}