How to dynamically configure Passportjs strategies?

Question

I am playing around with passport, and configuring my twitter login this way:

passport.use(new TwitterStrategy({
    consumerKey: '*****',
    consumerSecret: '*****',
    callbackURL: "http://blabla/callback"
  },
  function(token, tokenSecret, profile, done) {
    done(null, profile)
  }
));

I want to be able to configure this values: (consumerKey, consumerSecret, callbackURL) on runtime, based on the logged user. That is, each user will have their on Twitter app that they need to register with Twitter.

Any advice?

Answer 1

Instead of registering a strategy ahead-of-time with passport.use(), the strategy can be passed directly to authenticate() (as opposed to passing the strategy name).

For example:

function login(req, res, next) {
  var user = req.user;
  var consumerKey = getConsumerKeyForUser(user);
  // Create a strategy instance specifically for this user.
  var strategy = new TwitterStrategy({ consumerKey: consumerKey }, ...);
  // Authenticate using the user-specific strategy
  passport.authenticate(strategy)(req, res, next);
}

More information on this technique can be found here: https://medium.com/passportjs/authenticate-using-strategy-instances-49e58d96ec8c