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);
  }
});