How to use Firebase Auth in App inventor?

Hrichik_Mazumder · October 3, 2020, 6:00am

I have created a external auth system to work with appinventor but the problem is that we are unable to connect it with the builder. As firebase only returns the username it is difficult to easily connect it with app inventor because app inventor requires hashed (and salted) passwords. But firebase only returns email and UID. We have to edit the LoginServlet.java but what to edit I am unable to understand...

ewpatton · October 5, 2020, 4:06pm

We use email addresses for lookups in App Inventor. If an account doesn't exist for a given email address, it will create a new User object. The salted and hashed passwords are only used for local auth.

Hrichik_Mazumder · October 7, 2020, 5:18am

Thanks for the answer, can you please tell me what data is returned from Google to appinventor system, I mean what data Google returns after authentication. And the format also.

Regards

ewpatton · October 7, 2020, 6:45pm

All we get is the email address and the Google user ID. The code is in LoginServlet.java.

github.com

mit-cml/appinventor-sources/blob/cc121a481d7edd75878f24c3ccac70fa8584daa8/appinventor/appengine/src/com/google/appinventor/server/LoginServlet.java#L122


}


if (page.equals("google")) {
  // We get here after we have gone through the Google Login page
  // This is arranged via a security-constraint setup in web.xml
  com.google.appengine.api.users.User apiUser = userService.getCurrentUser();
  if (apiUser == null) {  // Hmmm. I don't think this should happen
    fail(req, resp, "Google Authentication Failed"); // Not sure what else to do
    return;
  }
  String email = apiUser.getEmail();
  String userId = apiUser.getUserId();
  User user = storageIo.getUser(userId, email);


  userInfo = new OdeAuthFilter.UserInfo(); // Create a new userInfo object


  userInfo.setUserId(user.getUserId()); // This effectively logs us in!
  userInfo.setIsAdmin(user.getIsAdmin());
  if (userService.isUserAdmin()) { // If we are a developer, we are always an admin
    userInfo.setIsAdmin(true);
  }