Added HTTPS support

Author: Miel Vander Sande

lib/LinkedDataFragmentsServer.js

@@ -1,15 +1,38 @@
 /*! @license MIT ©2014-2016 Ruben Verborgh - Ghent University / iMinds */
 /* LinkedDataFragmentsServer is an HTTP server that provides access to Linked Data Fragments */
 
-var http = require('http'),
-    _ = require('lodash'),
+var _ = require('lodash'),
+    fs = require('fs'),
+    path = require('path'),
     Util = require('./Util'),
     ErrorController = require('./controllers/ErrorController');
 
 // Creates a new LinkedDataFragmentsServer
 function LinkedDataFragmentsServer(options) {
-  // Create the HTTP server
-  var server = http.createServer(), sockets = 0;
+  // Create the HTTP(S) server
+  var server, sockets = 0,
+      protocol = options.protocol || 'http';
+
+  switch (protocol) {
+  case 'https':
+    var ssl = options.ssl || {};
+    _.assign(ssl,
+      _.mapValues(_.defaults(ssl.keys || {}, {
+        key: path.join(__dirname, '../localhost.key'),
+        cert: path.join(__dirname, '../localhost.crt'),
+      }),
+      function (v) {
+        return _.isArray(v) ? _.map(v, function (w) { return fs.readFileSync(w, 'ascii'); }) :  fs.readFileSync(v, 'ascii');
+      })
+      );
+
+    server = require('https').createServer(ssl);
+    break;
+  default:
+    server = require('http').createServer();
+  }
+  server._protocol = protocol;
+
   for (var member in LinkedDataFragmentsServer.prototype)
     server[member] = LinkedDataFragmentsServer.prototype[member];