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.