Checking Group Membership of UID

[alexschomb]

We're currently building our own authentication plugin and are now stuck at checking the group membership of a user.

Snippet that doesn't work so far:
var Groups = Groups = module.parent.require('./groups');
var isAdmin = Groups.isMember(uid, 'administrators', function() {});
if (isAdmin) { ... }

Another not-working idea:
var isAdmin = Groups.isMember(uid, 'administrators', function(err, isMember) {
if (isMember) { return true; }
});

Any ideas how to solve this?

[baris]

You can't return values from async functions like that you need to check the isMember value inside the callback.

Groups.isMember(uid, 'administrators', function(err, isAdmin) {
      if (err) {
          return console.error(err);
      }

      if (isAdmin) {
           console.log('user ' + uid + ' is an admin');
      } else {
           console.log('user ' + uid + ' is not an admin');
      } 
});

[pichalite]

@alexschomb Does it throw an error?

If you want to check if a user is an admin then you can probably use User.isAdministrator

[alexschomb]

Thanks to both of you for your quick help!

Both solution do work indeed. As baris pointed out, my failure was returning values from async functions.

Here is a working example for each solution:

var Groups = module.parent.require('./groups');
Groups.isMember(uid, 'administrators', function(err, isMember) {
  if (err) { next(err); }
  if (isMember) {
    winston.info('user is an administrator');
    Groups.join('administrators', uid);
  } else  {
     winston.info('user is no administrator');
     Groups.leave('administrators', uid);
  }
});

var User = module.parent.require('./user');
var Groups = module.parent.require('./groups');
User.isAdministrator(uid, function(err, isAdmin) {
  if (err) { next(err); }
  if (isAdmin) {
    winston.info('user is an administrator');
    Groups.join('administrators', uid);
  } else  {
     winston.info('user is no administrator');
     Groups.leave('administrators', uid);
  }
});