Declare authorizationParams in Strategy configuration

[bencmbrook]

I noticed authorizationParams are always declared in the call to passport.authorize in the route handler. Is it possible to declare them in the Strategy options object? It doesn't work today, but if it makes sense, then is this a reasonable feature?

For example, instead of declaring them here:

app.get('/auth/reddit', function(req, res, next){
  passport.authenticate('reddit', {
    state: 'exampleState',     // this
    duration: 'permanent',    // and this
  })(req, res, next);
});

Declare them here:

passport.use(new RedditStrategy({
    clientID: REDDIT_CONSUMER_KEY,
    clientSecret: REDDIT_CONSUMER_SECRET,
    callbackURL: "http://127.0.0.1:3000/auth/reddit/callback",
    state: 'exampleState',    // here (this works anyway because state is built in)
    duration: 'permanent'    // and here (doesn't work because it's an authorizationParam)
  },
  function(accessToken, refreshToken, profile, done) {