validator

一个有**特色的数据格式验证库

安装

go get github.com/liuhengloveyou/validator

然后在自己的代码中引用:

import (
	"github.com/liuhengloveyou/validator"
)

用法：

一个简单的示例：

type NewUserRequest struct {
	Username string `validate:"min=3,max=40,regexp=^[a-zA-Z]$"`
	Name string     `validate:"nonone"`
	Age int         `validate:"min=21"`
	Password string `validate:"min=8"`
	Email string    `validate:"email"`
	IdCard string   `validate:"idcard"`
}

nur := NewUserRequest{Username: "something", Age: 20}
if err := validator.Validate(nur); err != nil {
	// values not valid, deal with errors here
}

内置数据验证格式：

-
	略过该字段, 不做验证

noneor
	字段可以为空, 当它不为空的时候...配合别的规则验证, 不能单独使用
	
nonone
	验证字段不可为空

len
	For numeric numbers, max will simply make sure that the
	value is equal to the parameter given. For strings, it
	checks that the string length is exactly that number of
	characters. For slices,	arrays, and maps, validates the
	number of items. (Usage: len=10)

max
	For numeric numbers, max will simply make sure that the
	value is lesser or equal to the parameter given. For strings,
	it checks that the string length is at most that number of
	characters. For slices,	arrays, and maps, validates the
	number of items. (Usage: max=10)

min
	For numeric numbers, min will simply make sure that the value
	is greater or equal to the parameter given. For strings, it
	checks that the string length is at least that number of
	characters. For slices, arrays, and maps, validates the
	number of items. (Usage: min=10)

regexp
	Only valid for string types, it will validator that the
	value matches the regular expression provided as parameter.
	(Usage: regexp=^a.*b$)
	
email
	验证是否为合法的email字符串格式
	
phone
	验证是否为合法的**座机电话号码字符串格式
	
cellphone
	验证是否为合法的**手机号码字符串格式
	
idcard
	验证是否为合法的**身份证号字符串格式
	
unicn
	验证是否只包含中文Unicode字符

自定义格式验证

用户也可以用 SetValidationFunc 实现自定义的验证. 首先要实现自己的验证函数：

// Very simple validator
func notZZ(v interface{}, param string) error {
	st := reflect.ValueOf(v)
	if st.Kind() != reflect.String {
		return errors.New("notZZ only validates strings")
	}
	if st.String() == "ZZ" {
		return errors.New("value cannot be ZZ")
	}
	return nil
}

然后添加到Validator.cn构架：

validator.SetValidationFunc("notzz", notZZ)

就可以用"noZZ"标签做验证了：

type T struct {
	A string  `validate:"nonone,notzz"`
}
t := T{"ZZ"}
if valid, errs := validator.Validate(t); !valid {
	fmt.Printf("Field A error: %s\n", errs["A"][0])
}