greenlock-koa.js/README.md

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# letsencrypt-koa

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
```

*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';

/* Note: using staging server url, remove .testing() for production
Using .testing() will overwrite the debug flag with true */ 
var LEX = require('letsencrypt-express').testing();

var lex = LEX.create({
  configDir: require('os').homedir() + '/letsencrypt/etc'
, approveRegistration: function (hostname, cb) { // leave `null` to disable automatic registration
    // Note: this is the place to check your database to get the user associated with this domain
    cb(null, {
      domains: [hostname]
    , email: 'CHANGE_ME' // user@example.com
    , agreeTos: 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 \
  --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();
var redirectHttps = koa().use(require('koa-force-ssl').callback();

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

var server = https.createServer(lex.httpsOptions, LEX.createAcmeResponder(lex, app.callback()));
var redirectServer = http.createServer(LEX.createAcmeResponder(lex, redirectHttps)));

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

redirectServer.listen(80, function () {
  console.log('Redirecting insecure traffic from http://localhost:' + this.address().port + ' to https');
});
```