urlegit

URLegit is a library for validating URLs.

Summary

URL validation is complex and very specific to the task at hand. This library's goal is to provide a toolkit for making pre-flight checks against a URL easier.

Usage

package main

import (
	"fmt"

	"github.com/xmidt-org/urlegit"
)

func main() {
	c, err := urlegit.New(
		urlegit.OnlyScheme("https"),
		urlegit.ForbidSpecialUseDomains(),
	)

	if err != nil {
		panic(err)
	}

	url := "https://github.com"
	fmt.Printf("Is %q allowed? %t\n", url, c.Legit(url))

	// Output:
	// Is "https://github.com" allowed? true
}

Go Playground

Resources

• https://www.w3.org/Addressing/URL/5_BNF.html
• https://datatracker.ietf.org/doc/html/rfc1738
• https://www.iana.org/assignments/special-use-domain-names/special-use-domain-names.xhtml
• https://www.iana.org/assignments/iana-ipv4-special-registry/iana-ipv4-special-registry.xhtml
• https://www.iana.org/assignments/iana-ipv6-special-registry/iana-ipv6-special-registry.xhtml

Footnotes

This library originally started of in xmidt-org/ancla as webhook URL validation code. Here is a perma link to that code.