User Signup in Multisite – Need Plugin or Advice

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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!

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  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.