Unable to show flash message from Passport.js - node.js

Question

I'm having problem with sending a flash if authentication fails. Except that everything is OK. When I'm copying example (https://github.com/jaredhanson/connect-flash) to my app flash messages are working fine...
Here is my code:
//routes
app.get('/login', function (req,res){
res.render('login', {
authMessage: req.flash('authMessage')
});
});
app.post('/login', passport.authenticate('local', {
failureRedirect: '/login',
failureFlash: true
}), function(req,res){
res.send('ok');
});
//local strategy
passport.use(new LocalStrategy(
function(username, password, authCheckDone) {
UserDetails.findOne({username : username}).then(
function(user){
if (!user) {
console.log('bad username');
return authCheckDone(null, false, {authMessage: 'Wrong name'});
}
if (user.password !== password) {
console.log('bad password');
return authCheckDone(null, false, {authMessage: 'Wrong password'});
}
return authCheckDone(null, user);
}),
function(error){
return authCheckDone(error);
};
}
));
//ejs
<% if (authMessage.length > 0) { %>
<p>test</p>
<%= authMessage %>
<% } %>
I've read somewhere this problem may be related with security and not using https, but if that would be the case example from github wouldn't work either...

Answer 1

If I am not wrong, the callback you pass to LocalStrategy should have as first parameter the request object. So your function would look like this:
function(req, username, password, authCheckDone) {
// your code
After that, according to an example that I have, you should return the result of authCheckDone in the following way:
return authCheckDone(null, false, req.flash('authMessage', "your message"));
But make sure you create the LocalStrategy object in the following way:
new LocalStrategy({
passReqToCallback: true // don't forget this
}, function(req, username, password, authCheckDone) {