node-letsencrypt-client

Implementation of the ACME protocol to request certificates from Let's Encrypt.

Installation

npm install letsencrypt-client

Usage

constructor(acccountKey)

Create a client by providing the PEM encoded account private key.

'use strict'

const fs = require("fs");
const LEClient = require("letsencrypt-client");

let accountKey = fs.readFileSync("account.key");

let client = new LEClient(accountKey);

To create a new private key, use the following OpenSSL command:

openssl genrsa 4096 > account.key

register()

To register with Let's Encrypt, use the register() method.

client.register().then(() => {
    console.log("Registered successfully");
}, (error) => {
    console.log("An error occured", error);
});

This method returns a standard ES6 Promise.

requestAuthorization(domain)

To request a domain verification challenge, use the requestAuthorization(domain) method, by providing the domain that needs to be verified.

let domain = "example.com";
client.requestAuthorization(domain).then((challenge) => {
    console.log("Domain verification challenge requested successfully");
    console.log(challenge);
}, (error) => {
    console.log("An error occured", error);
});

This method returns a standard ES6 Promise.

The resulting challenge object will contain a path key with the path that the Let's Encrypt server will request, and a keyAuthorization key with the value that should be returned to the Let's Encrypt request.

triggerChallenge(challenge)

Once the HTTP server has been configured to respond with the correct value, use the triggerChallenge(challenge) method to trigger the challenge. Pass the challenge object from the requestAuthorization(domain) method.

client.triggerChallenge(challenge).then(() => {
    console.log("Challenge triggered successfully");
}, (error) => {
    console.log("An error occured", error);
});

This method returns a standard ES6 Promise.

checkChallenge(challenge)

You can check the status of a challenge with the checkChallenge(challenge) method. Pass the challenge object from the requestAuthorization(domain) method.

client.checkChallenge(challenge).then((status) => {
    console.log("Challenge checked successfully");
    console.log(status);
}, (error) => {
    console.log("An error occured", error);
});

This method returns a standard ES6 Promise.

The status value can be pending, valid (domain ownership confirmed) or invalid (domain ownership failed).

requestCertificate(csr)

Once all the domains of the certificate signing request (CSR) have been validated, use the requestCertificate(csr) method to request the certificate. The PEM encoded CSR needs to be provided.

let csr = fs.readFileSync("domain.csr");
client.requestCertificate(csr).then((certificate) => {
    console.log("Certificate requested successfully");
    console.log(certificate);
}, (error) => {
    console.log("An error occured", error);
});

This method returns a standard ES6 Promise.

The resulting certificate will contain the PEM encoded certificate string.

To create a new certificate signing request, use the following OpenSSL command (from diafygi/acme-tiny):

#for a single domain
openssl req -new -sha256 -key domain.key -subj "/CN=yoursite.com" > domain.csr

#for multiple domains (use this one if you want both www.yoursite.com and yoursite.com)
openssl req -new -sha256 -key domain.key -subj "/" -reqexts SAN -config <(cat /etc/ssl/openssl.cnf <(printf "[SAN]\nsubjectAltName=DNS:yoursite.com,DNS:www.yoursite.com")) > domain.csr