add express example

examples/express.js

@@ -0,0 +1,44 @@
+'use strict';
+
+// allow node.js to bind to port 80 and 443 without root:
+//
+//   sudo setcap 'cap_net_bind_service=+ep' `which node`
+
+/* Note: using staging server url, remove .testing() for production
+Using .testing() will overwrite the debug flag with true */
+var LEX = require('../').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: 'aj@daplie.com' // user@example.com
+    , agreeTos: true
+    });
+  }
+});
+var http = require('http');
+var https = require('spdy');
+// NOTE: you could use the old https module if for some reason you don't want to support modern browsers
+
+function redirectHttp() {
+  http.createServer(LEX.createAcmeResponder(lex, function redirectHttps(req, res) {
+    res.setHeader('Location', 'https://' + req.headers.host + req.url);
+    res.statusCode = 302;
+    res.end('<!-- Hello Developer Person! Please use HTTPS instead -->');
+  })).listen(80);
+}
+
+function serveHttps() {
+  var app = require('express')();
+
+  app.use('/', function (req, res) {
+    res.end('Hello!');
+  });
+
+  https.createServer(lex.httpsOptions, LEX.createAcmeResponder(lex, app)).listen(443);
+}
+
+redirectHttp();
+serveHttps();