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# letsencrypt-koa

[![Join the chat at https://gitter.im/Daplie/letsencrypt-express](https://badges.gitter.im/Daplie/letsencrypt-express.svg)](https://gitter.im/Daplie/letsencrypt-express?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)

| [letsencrypt (lib)](https://github.com/Daplie/node-letsencrypt)
| [letsencrypt-cli](https://github.com/Daplie/letsencrypt-cli) 
| [letsencrypt-express](https://github.com/Daplie/letsencrypt-express)
| [letsencrypt-cluster](https://github.com/Daplie/letsencrypt-cluster)
| **letsencrypt-koa**
| [letsencrypt-hapi](https://github.com/Daplie/letsencrypt-hapi)
|

Free SSL and Automatic HTTPS for node.js with KOA and other middleware systems via Let's Encrypt

* Automatic Registration via SNI (`httpsOptions.SNICallback`)
  * **registrations** require an **approval callback** in *production*
* Automatic Renewal (around 80 days)
  * **renewals** are *fully automatic* and happen in the *background*, with **no downtime**
* Automatic vhost / virtual hosting

All you have to do is start the webserver and then visit it at it's domain name.

## Install

```
npm install --save letsencrypt-express@2.x
```

*Pay no attention to the man behind the curtain.* (just ignore that the name of the module is letsencrypt-express)

### Part 1: Setup

```javascript
'use strict';

var le = require('letsencrypt-express').create({
  server: 'staging' // in production use 'https://acme-v01.api.letsencrypt.org/directory'
  
, configDir: require('os').homedir() + '/letsencrypt/etc'

, approveDomains: function (opts, certs, cb) {
    opts.domains = certs && certs.altnames || opts.domains;
    opts.email = 'john.doe@example.com' // CHANGE ME
    opts.agreeTos = true;

    cb(null, { options: opts, certs: certs });
  }

 , debug: true
});
```

WARNING: If you don't do any checks and simply complete `approveRegistration` callback, an attacker will spoof SNI packets with bad hostnames and that will cause you to be rate-limited and or blocked from the ACME server. Alternatively, You can run registration *manually*:

```bash
npm install -g letsencrypt-cli

letsencrypt certonly --standalone \
  --server 'https://acme-v01.api.letsencrypt.org/directory' \
  --config-dir ~/letsencrypt/etc \
  --agree-tos --domains example.com --email user@example.com
  
# Note: the '--webrootPath' option is also available if you don't want to shut down your webserver to get the cert.
```

### Part 2: Just add Koa

```javascript
var http = require('http');
var https = require('spdy');
var koa = require('koa');
var app = koa();

app.use(function *() {
  this.body = 'Hello World';
});

var server = https.createServer(le.httpsOptions, le.middleware(app.callback()));

server.listen(443, function () {
 console.log('Listening at https://localhost:' + this.address().port);
});


var http = require('http');
var redirectHttps = koa().use(require('koa-sslify')()).callback();
http.createServer(le.middleware(redirectHttps)).listen(80, function () {
  console.log('handle ACME http-01 challenge and redirect to https');
});
```