Mittwoch, 18. Mai, 2016

MongoDB CRUD the MVC way with Passport Authentication 79
14 User.findUniqueUsername(possibleUsername, null, function(ava\
15 ilableUsername) {
16 profile.username = availableUsername;
17 user = new User(profile);
18
19 user.save(function(err) {
20 if (err) {
21 var message = _this.getErrorMessage(err);
22 req.flash('error', message);
23 return res.redirect('/signup');
24 }
25
26 return done(err, user);
27 });
28 });
29 }
30 else {
31 return done(err, user);
32 }
33 }
34 }
35 );
36 };
This method accepts a user profile, and then looks for an existing user with providerId and provider
properties. If the user is found, it calls the done() callback method with the user’s MongoDB
document. However, if an existing user isn’t found, it will find a unique username using the _User
_model’s findUniqueUsername() static method and save a new user instance. If an error occurs, the
saveOAuthUserProfile() method will use the req.flash() and getErrorMessage() methods to report
the error; otherwise, it will pass the user object to the done() callback method.
Now, install the Facebook strategy module:
1 npm install passport-facebook --save
Create a Facebook application
Before you can configure your Facebook strategy, you have to go to Facebook’s developer home
page at https://developers.facebook.com/¹³⁵ and create a new Facebook application:
¹³⁵https://developers.facebook.com/