How to passing data in TwitterStrategy, PassportJS? - node.js

Question

I have three kind of user:
Viewer (link to sign in: auth/v/twitter)
Creator (link to sign in: auth/c/twitter)
Admin (link to sign in: auth/a/twitter)
And also I have 3 different db/collection
c_viewer
c_creator
c_admin
Where each kind of user have a different link to sign in.
Now let's take a look at the codes
var passport = require('passport')
,TwitterStrategy = require('passport-twitter').Strategy;
passport.use(new TwitterStrategy({
consumerKey: config.development.tw.consumerKey,
consumerSecret: config.development.tw.consumerSecret,
callbackURL: config.development.tw.callbackURL
},
function(token, tokenSecret, profile, done) {
process.nextTick(function(req, res) {
var query = User.findOne({ 'twId': profile.id});
query.exec(function(err, oldUser){
if(oldUser) {
done(null, oldUser);
} else {
var newUser = new User();
newUser.twId = profile.id;
newUser.twUsername = profile.username;
newUser.name = profile.displayName;
newUser.avatar = profile.photos[0].value;
-> newUser.age = req.body.creator.age; ???
newUser.save(function(err) {
if(err) throw err;
done(null, newUser);
});
};
});
});
}));
app.get('/auth/c/twitter', passport.authenticate('twitter'),
function(req, res) {
var userUrl = req.url;
// codes to pass the userUrl to TwitterStrategy
});
app.get('/auth/twitter/callback',
passportForCreator.authenticate('twitter', { successRedirect: '/dashboard', failureRedirect: '/' }));
And this is my form
<input type="text" name="creator[age]" placeholder="How old are you?">
<a id="si" class="btn" href="/auth/c/twitter">Sign in</a>
My questions:
1. Can We pass <input> data to the login process? so We can read the input data in TwitterStrategy, and save to the db
2. Can We get "c" from login url (auth/ c /twitter) and pass it to TwitterStrategy? so we can simply check in different db/collection and change the query.

Answer 1

The idea is to store your values before redirecting user on twitter for authentication, and re-use these values once the user came back.
OAuth2 includes the scope parameter, which perfectly suits that case. Unfortunately, TwitterStrategy is based on OAuth1. But we can tackle it !
The next trick is about when creating the user.
You should not do it when declaring strategy (because you cannot access input data), but a little later, in the last authentication callback
see here the callback arguments.
Declaring your strategy:
passport.use(new TwitterStrategy({
consumerKey: config.development.tw.consumerKey,
consumerSecret: config.development.tw.consumerSecret,
callbackURL: config.development.tw.callbackURL
}, function(token, tokenSecret, profile, done) {
// send profile for further db access
done(null, profile);
}));
When declaring your authentication url (repeat for a/twitter and v/twitter):
// declare states where it's accessible inside the clusre functions
var states={};
app.get("/auth/c/twitter", function (req, res, next) {
// save here your values: database and input
var reqId = "req"+_.uniqueId();
states[reqId] = {
database: 'c',
age: $('input[name="creator[age]"]').val()
};
// creates an unic id for this authentication and stores it.
req.session.state = reqId;
// in Oauth2, its more like : args.scope = reqId, and args as authenticate() second params
passport.authenticate('twitter')(req, res, next)
}, function() {});
Then when declaring the callback:
app.get("/auth/twitter/callback", function (req, res, next) {
var reqId = req.session.state;
// reuse your previously saved state
var state = states[reqId]
passport.authenticate('twitter', function(err, token) {
var end = function(err) {
// remove session created during authentication
req.session.destroy()
// authentication failed: you should redirect to the proper error page
if (err) {
return res.redirect("/");
}
// and eventually redirect to success url
res.redirect("/dashboard");
}
if (err) {
return end(err);
}
// now you can write into database:
var query = User.findOne({ 'twId': profile.id});
query.exec(function(err, oldUser){
if(oldUser) {
return end()
}
// here, choose the right database depending on state
var newUser = new User();
newUser.twId = profile.id;
newUser.twUsername = profile.username;
newUser.name = profile.displayName;
newUser.avatar = profile.photos[0].value;
// reuse the state variable
newUser.age = state.age
newUser.save(end);
});
})(req, res, next)
});