Tag Validate

The ultimate way to validate your data. All you need is add some info on tags with some simple description!

Install

`go get github.com/sadnoodles/tagvalidate`

Example:

package main

import (
	"fmt"

	"github.com/sadnoodles/tagvalidate"
)

type Common struct {
	Id   int64  `zero:"true" max:"20" min:"7" neq:"11"` // Add tags here
	Uuid string `empty:"true" type:"uuid"` // Add tags here
}

func main() {
	c := new(Common)
	c.Id = 4         //Validate error. @Field:Id tag:min wanted:7, Got: 4
	c.Uuid = "ssasd" //Validate error. @Field:Uuid tag:type wanted:uuid, Got: "ssasd"
	err := tagvalidate.Check(c) // Check a instance of Common struct
	if err != nil {
		fmt.Println(err)
	}
}

Usage:

Syntax: {option name}:"{option value}" [{option name2}:"{option value2}"...]

For string field you can use those:

Option	Value	Meaning
empty	false/true	Allow this field empty or not
eq	any string (s)	Strictly equal to s
neq	any string	Strictly not equal to s
starts	any string	Starts with s
ends	any string	Ends with s
contains	any string	Contains s
ncontains	any string	Note contains s
upper	false/true
lower	false/true
len	int	Must be this long
max_len	int	Max length
min_len	int	Min length
regx	reg exp	re check
type	See type table	Frequency types
func	Func name	Custom functions under your struct
		func (string) bool

Type is a quick access to some frequency data type, most of then is validated by regx. Use type tag like this:

type LoginLog struct{
    User string `empty:"false" type:"email"`
    IP string `type:"ipv4"` 
}

For type, allow those values. To add extra value (if this type allowed extra value) use , after type name like: type:"date,2006-01-02":

Type name	meaning	examples	Extra value
int		1, +123, -3, 0	-
float			-
hex			-
ipv4	ipv4 only		-
ip	ipv4 or ipv6		-
email			-
url			-
hexcolor	color use hex		-
fullpath	windows or unix full path		-
uuid3			-
uuid4			-
uuid5			-
uuid			-
num	number		-
alpha	alpha table		-
md5	MD5 checksum (length 32)		-
md5(16)	MD5 checksum (length 16)		-
base64	base64 encoded string		-
date	date format		date formating string
json	json dumped string
*domain	domain of a web site
*map
*list

* Those are not done yet.

To check if data is a LAN IP:

InnerIP string `type:"ip" regx:"^(127|192|172|10[\\D])"`

NOTE: dot(".") in tag will cause tag parse error. Also you should use two \\ to escape slash.

For integers:

Option	Value	Meaning
zero	false/true	Allow zero or not
eq	any int (i)	Strictly equal to i
neq	any int	Strictly not equal to i
max	int	Max value
min	int	Min value
func	Func name	Custom functions under your struct
		func (int64) bool

TODO

Float field.
Struct field.
Map field.
Array field.
Child struct check.
Set to default value when empty.