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---
title: "Library"
date: 2019-03-03T16:39:46+01:00
draft: false
---
Lego can be use as a Go Library.
<!--more-->
## GoDoc
The GoDoc can be found here: [GoDoc](https://pkg.go.dev/mod/github.com/go-acme/lego/v4).
## Usage
A valid, but bare-bones example use of the acme package:
```go
package main
import (
"crypto"
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"fmt"
"log"
"github.com/go-acme/lego/v4/certcrypto"
"github.com/go-acme/lego/v4/certificate"
"github.com/go-acme/lego/v4/challenge/http01"
"github.com/go-acme/lego/v4/challenge/tlsalpn01"
"github.com/go-acme/lego/v4/lego"
"github.com/go-acme/lego/v4/registration"
)
// You'll need a user or account type that implements acme.User
type MyUser struct {
Email string
Registration *registration.Resource
key crypto.PrivateKey
}
func (u *MyUser) GetEmail() string {
return u.Email
}
func (u MyUser) GetRegistration() *registration.Resource {
return u.Registration
}
func (u *MyUser) GetPrivateKey() crypto.PrivateKey {
return u.key
}
func main() {
// Create a user. New accounts need an email and private key to start.
privateKey, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
if err != nil {
log.Fatal(err)
}
myUser := MyUser{
Email: "you@yours.com",
key: privateKey,
}
config := lego.NewConfig(&myUser)
// This CA URL is configured for a local dev instance of Boulder running in Docker in a VM.
config.CADirURL = "http://192.168.99.100:4000/directory"
config.Certificate.KeyType = certcrypto.RSA2048
// A client facilitates communication with the CA server.
client, err := lego.NewClient(config)
if err != nil {
log.Fatal(err)
}
// We specify an HTTP port of 5002 and an TLS port of 5001 on all interfaces
// because we aren't running as root and can't bind a listener to port 80 and 443
// (used later when we attempt to pass challenges). Keep in mind that you still
// need to proxy challenge traffic to port 5002 and 5001.
err = client.Challenge.SetHTTP01Provider(http01.NewProviderServer("", "5002"))
if err != nil {
log.Fatal(err)
}
err = client.Challenge.SetTLSALPN01Provider(tlsalpn01.NewProviderServer("", "5001"))
if err != nil {
log.Fatal(err)
}
// New users will need to register
reg, err := client.Registration.Register(registration.RegisterOptions{TermsOfServiceAgreed: true})
if err != nil {
log.Fatal(err)
}
myUser.Registration = reg
request := certificate.ObtainRequest{
Domains: []string{"mydomain.com"},
Bundle: true,
}
certificates, err := client.Certificate.Obtain(request)
if err != nil {
log.Fatal(err)
}
// Each certificate comes back with the cert bytes, the bytes of the client's
// private key, and a certificate URL. SAVE THESE TO DISK.
fmt.Printf("%#v\n", certificates)
// ... all done.
}
```
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