Fixing issues 71, 78, 80

This is a fix for issues #71, #78 , and #80

Author: Ashish Mishra

lib/self-signed-jwt.js

@@ -124,7 +124,15 @@ SelfSignedJwt.prototype._throwOnInvalidJwtSignature = function(jwt) {
 };
 
 SelfSignedJwt.prototype._signJwt = function(header, payload, certificate) {
-  var jwt = jws.sign({ header : header, payload : payload, secret : certificate});
+  var jwt;
+  try {
+     jwt = jws.sign({ header : header, payload : payload, secret : certificate });
+  }
+  catch (err) {
+     this._log.error(err);
+     throw this._log.createError('Failed to sign JWT.This is most likely due to an invalid certificate.');   
+  }
+  
   this._throwOnInvalidJwtSignature(jwt);
   return jwt;
 };

lib/token-request.js

@@ -354,11 +354,12 @@ TokenRequest.prototype._getTokenUsernamePasswordFederated = function(username, p
     var mex = this._createMex(mexEndpoint);
     mex.discover(function(mexErr) {
       var wstrustEndpoint;
-      var wstrustVersion = WSTrustVersion.UNDEFINED;
+      wstrustVersion = WSTrustVersion.UNDEFINED;
       if (mexErr) {
         self._log.warn('MEX exchange failed.  Attempting fallback to AAD supplied endpoint.');
 
         wstrustEndpoint = self._userRealm.federationActiveAuthUrl;
+        wstrustVersion = self._parseWStrustVersionFromFederationActiveAuthUrl(self._userRealm.federationActiveAuthUrl);
         if (!wstrustEndpoint) {
           callback(self._createADWSTrustEndpointError());
           return;

sample/package.json

@@ -4,7 +4,7 @@
   , "private": true
   , "dependencies": {
       "adal-node": ">= 0.1.3",
-      "express": "2.x",
+      "express": "3.x",
       "connect-logger": "0.x",
       "cookie-parser": "1.x",
       "cookie-session": "1.x"