alseiitov/validator

Struct values validator for Golang

validator

Struct values validator for Golang

Install

$ go get -u github.com/alseiitov/validator

Usage

Flag	Description
required	string length must be more than zero and it must contain not only spaces, tabs or newlines int value must not be zero
password	string must contain at least one lowercase, one uppercase, one number and one symbol
email	string must be a valid email address
username	string must contain only letters, digits, dots, underscores and dashes
min=value	string length must be greater than or equal to given value int value must be greater than or equal to given value
max=value	string length must be less than or equal to given value int value must be less than or equal to given value

If array have required flag it must contain at least one element. Other flags works for elements in array, but not for array itself.

Example

package main

import (
	"fmt"

	"github.com/alseiitov/validator"
)

type user struct {
	Username  string   `validator:"required,username,min=3,max=32"`
	Password  string   `validator:"required,password,min=7,max=32"`
	Email     string   `validator:"required,email"`
	Age       int      `validator:"required,min=18"`
	Interests []string `validator:"required,min=2, max=32"`
}

func main() {
	users := []user{
		user{
			Username:  "johndoe",
			Password:  "Password123@",
			Email:     "john_doe@protonmail.com",
			Age:       18,
			Interests: []string{"IT", "Music"},
		},
		user{
			Username:  "",
			Password:  "Password123@",
			Email:     "john_doe@protonmail.com",
			Age:       18,
			Interests: []string{"IT", "Music"},
		},
		user{
			Username:  "johndoe",
			Password:  "Password@",
			Email:     "john_doe@protonmail.com",
			Age:       18,
			Interests: []string{"IT", "Music"},
		},
		user{
			Username:  "johndoe",
			Password:  "Password123@",
			Email:     "john_doeprotonmail.com",
			Age:       18,
			Interests: []string{"IT", "Music"},
		},
		user{
			Username:  "johndoe",
			Password:  "Password123@",
			Email:     "john_doe@protonmail.com",
			Age:       17,
			Interests: []string{"IT", "Music"},
		},
		user{
			Username:  "johndoe",
			Password:  "Password123@",
			Email:     "john_doe@protonmail.com",
			Age:       18,
			Interests: []string{},
		},
		user{
			Username:  "johndoe",
			Password:  "Password123@",
			Email:     "john_doe@protonmail.com",
			Age:       18,
			Interests: []string{"A"},
		},
	}

	for _, u := range users {
		if err := validator.Validate(u); err != nil {
			fmt.Printf("%s\n\n", err.Error())
		} else {
			fmt.Printf("OK!\n\n")
		}
	}
}

$ go run main.go
OK!

Username is required

Password must contain at least one number

e-mail is invalid

Age value (17) is lower than minimum value (18)

Interests is required

Interests length (1) is lower than minimum length (2)