User Signup in Multisite - Need Plugin or Advice

Question

I'm trying to make some modifications to a wordpress multisite and i could use some help from someone more experienced. I want to restrict the acces to my blogs unless the user has an account. In detail : i have a series of blogs, each one with an admin/autor. If a user wants to read posts from a blog, he should first go on the main site, to wp-signup.php and create an account. I'm planning on creating a plugin, active on all subsites. Is this possible? if yes, could someone give me some directions - wich hooks, filters and functions i would need ?

Thank you!

Answer 1

Test if the current visitor is logged in and registered as user

// If the user's not registered & logged in, abort
if ( ! is_user_logged_in() )
    return;

Test if the currently logged in user has a capability for the specific blog

$blog_id = ''; // You need to retrieve and set that here
// If the currently logged in user hasn't got the 'manage_options' cap - which is assigned to admins and above - abort
if ( ! current_user_can_for_blog( $blog_id, 'manage_options' ) )
    return;

If it's not necessary to check for a specific blog, we can test just the capability.

// If the currently logged in user hasn't got the 'manage_options' cap - which is assigned to admins and above - abort
if ( ! current_user_can( 'manage_options' ) )
    return;

This (old and not maintained) plugin gives you better in-depth look at what users deliver.