verify that my repo it's in fact a github repo URL in Go

Issue

Is there a method in Go to verify that a repo type string is in fact an actual Github repo URL?

I’m running this code that clones a repo, but before I run exec.Command("git", "clone", repo) and i want to make sure that repo is valid.

    package utils

    import (
        "os/exec"
    )

    //CloneRepo clones a repo lol
    func CloneRepo(args []string) {

        //repo URL
        repo := args[0]

        //verify that is an actual github repo URL

        //Clones Repo
        exec.Command("git", "clone", repo).Run()

    }

Solution

Here’s a simple approach using the net, net/url, and strings packages.

package main

import (
    "fmt"
    "net"
    "net/url"
    "strings"
)

func isGitHubURL(input string) bool {
    u, err := url.Parse(input)
    if err != nil {
        return false
    }
    host := u.Host
    if strings.Contains(host, ":") { 
        host, _, err = net.SplitHostPort(host)
        if err != nil {
            return false
        }
    }
    return host == "github.com"
}

func main() {
    urls := []string{
        "https://github.com/foo/bar",
        "http://github.com/bar/foo",
        "http://github.com.evil.com",
        "http://github.com:8080/nonstandard/port",
        "http://other.com",
        "not a valid URL",
    }
    for _, url := range urls {
        fmt.Printf("URL: \"%s\", is GitHub URL: %v\n", url, isGitHubURL(url))
    }
}

Output:

URL: "https://github.com/foo/bar", is GitHub URL: true
URL: "http://github.com/bar/foo", is GitHub URL: true
URL: "http://github.com.evil.com", is GitHub URL: false
URL: "http://github.com:8080/nonstandard/port", is GitHub URL: true
URL: "http://other.com", is GitHub URL: false
URL: "not a valid URL", is GitHub URL: false

Go Playground

Answered By – chuckx

Answer Checked By – Marie Seifert (GoLangFix Admin)