gistfile1

<?php
$events->attach(
    'EdpUser\Authentication\Adapter\AdapterChain', 
    'authenticate', 
    function($e) use ($request, $config) {
        $chain = $e->getTarget();
        $adapter = new My\Custom\Adapter($config['auth']);
        $adapter->setCredentialsFromRequest($request);
        $chain->register($adapter);
    }
);