Make lib/app.js a factory for lamassu-server

Extract all command line parsing to `bin/lamassu-server`.

This will effectively make it easier to write tests for
`lamassu-server`.

bin/lamassu-server

@@ -0,0 +1,26 @@
+#!/usr/bin/env node
+var createServer = require('../lib/app.js');
+var argv = require('optimist').argv;
+
+var options = {
+  postgres: process.env.DATABASE_URL
+};
+
+var port = process.env.PORT || 3000;
+
+if (!argv.http) {
+  if (!argv.key || !argv.cert) {
+    console.error('--key and --cert are required');
+    process.exit(1);
+  }
+
+  options.https = {
+    key: fs.readFileSync(argv.key),
+    cert: fs.readFileSync(argv.cert)
+  };
+}
+
+var server = createServer(options);
+server.listen(port, function () {
+  console.log('lamassu-server listening on port ' + port + ' ' + argv.http ? '(http)' : '(https)');
+});

lib/app.js

@@ -21,62 +21,64 @@ var http = require('http');
 var https = require('https');
 var path = require('path');
 var express = require('express');
-var argv = require('optimist').argv;
-var app = express();
 var fs = require('fs');
 var LamassuConfig = require('lamassu-config');
 var routes = require('./routes');
 
-var conString, dbConfig, config;
+module.exports = function (options) {
+  var connectionString = options.postgres;
+  var app = express();
+  var server;
+  var config;
 
-conString = process.env.DATABASE_URL || 'postgres://lamassu:lamassu@localhost/lamassu';
+  connectionString = connectionString ||
+                     'postgres://lamassu:lamassu@localhost/lamassu';
 
-config = new LamassuConfig(conString);
+  config = new LamassuConfig(connectionString);
 
-var port = process.env.PORT || 3000;
-app.use(express.logger());
-app.use(express.favicon());
-app.use(express.bodyParser());
-app.use(express.methodOverride());
+  app.use(express.logger());
+  app.use(express.favicon());
+  app.use(express.bodyParser());
+  app.use(express.methodOverride());
 
-config.load(function(err, conf) {
-  if (err) { console.log(err); process.exit(1); }
-
-  var authMiddleware = function (req, res, next) { return next(); };
-
-  if (argv.http) {
-    http.createServer(app).listen(port, function () {
-      console.log('Express server listening on port ' + port + ' (http)');
-    });
+  if (!options.https) {
+    server = http.createServer(app);
   }
   else {
-    authMiddleware = function(req, res, next) {
-      var fingerprint = req.connection.getPeerCertificate().fingerprint;
-      var e = new Error('Unauthorized');
-      e.status = 401;
-
-      config.isAuthorized(fingerprint, function (err, device) {
-        if (err) { return next(e); }
-        if (!device) { return next(e); }
-        req.device = device;
-        next();
-      });
-    };
-
-    var options = {
-      key: fs.readFileSync(argv.key),
-      cert: fs.readFileSync(argv.cert),
+    var serverOptions = {
+      key: options.https.key,
+      cert: options.https.cert,
       requestCert: true,
       secureProtocol: 'TLSv1_method',
       ciphers: 'AES128-GCM-SHA256:RC4:HIGH:!MD5:!aNULL:!EDH',
       honorCipherOrder: true
     };
 
-    https.createServer(options, app).listen(port, function () {
-      console.log('Express server listening on port ' + port + ' (https)');
-    });
+    server = https.createServer(options, app);
   }
 
-  routes.init(app, conf, config, authMiddleware);
+  config.load(function(err, conf) {
+    if (err) { console.log(err); process.exit(1); }
 
-});
+    var authMiddleware = function (req, res, next) { return next(); };
+
+    if (options.https) {
+      authMiddleware = function(req, res, next) {
+        var fingerprint = req.connection.getPeerCertificate().fingerprint;
+        var e = new Error('Unauthorized');
+        e.status = 401;
+
+        config.isAuthorized(fingerprint, function (err, device) {
+          if (err) { return next(e); }
+          if (!device) { return next(e); }
+          req.device = device;
+          next();
+        });
+      };
+    }
+
+    routes.init(app, conf, config, authMiddleware);
+  });
+
+  return server;
+};