Make protocol configurable

examples/login/app.js

@@ -39,7 +39,8 @@ passport.use(new SamlStrategy(
   {
     path: '/login/callback',
     entryPoint: 'https://openidp.feide.no/simplesaml/saml2/idp/SSOService.php',
-    issuer: 'passport-saml'
+    issuer: 'passport-saml',
+    protocol: 'http://'
   },
   function(profile, done) {
     if (!profile.email) {

lib/passport-saml/saml.js

@@ -9,6 +9,11 @@ SAML.prototype.initialize = function (options) {
   if (!options) {
     options = {};
   }
+
+  if (!options.protocol) {
+    options.protocol = 'https://';
+  }
+
   if (!options.path) {
     options.path = '/saml/consume';
   }
@@ -39,13 +44,11 @@ SAML.prototype.generateInstant = function () {
 };
 
 SAML.prototype.generateRequest = function (req) {
-  var http = "http://";
-  var https = "https://";
   var id = "_" + this.generateUniqueID();
   var instant = this.generateInstant();
 
   // Post-auth destination
-  var callbackUrl = https + req.headers.host + this.options.path;
+  var callbackUrl = this.options.protocol + req.headers.host + this.options.path;
 
   var request =
    "<samlp:AuthnRequest xmlns:samlp=\"urn:oasis:names:tc:SAML:2.0:protocol\" ID=\"" + id + "\" Version=\"2.0\" IssueInstant=\"" + instant + "\" ProtocolBinding=\"urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST\" AssertionConsumerServiceURL=\"" + callbackUrl + "\">" +