AddToAclHandler.php

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<?php

namespace Elgg\Friends;

class AddToAclHandler {
    
    public function __invoke(\Elgg\Event $event) {
        $relationship_object = $event->getObject();
        if (!$relationship_object instanceof \ElggRelationship) {
            return;
        }
        
        if ($relationship_object->relationship !== 'friend') {
            return;
        }
        
        $user = get_user($relationship_object->guid_one);
        $friend = get_user($relationship_object->guid_two);
        
        if (!$user || !$friend) {
            return;
        }
        
        $acl = $user->getOwnedAccessCollection('friends');
        if (empty($acl)) {
            return;
        }
        
        $acl->addMember($friend->guid);
    }
}