bootstrap.php

<?php

// Load configuration from APP/config/Bakeoff/Checkpoint.php
\Cake\Core\Configure::load($this->getName(), 'default');

// Ensure we get plugin name in PHP namespace format, i.e. with backslashes
$pluginNamespace = str_replace('/', '\\', $this->getName());

// Get configured adapter, either just name, or in full and with namespace
$adapter = \Cake\Core\Configure::read($this->getName().'.adapter');

// Default to built-in example adapter
if (empty($adapter)) {
    $adapter = 'Honeypot';
}

// Ensure full adapter class path including namespace
if (strpos($adapter, '\\') === false) {
    $adapter = $pluginNamespace . '\\Controller\\Adapter\\' . $adapter . 'Controller';
}

// Alias virtual ChallengeController to currently configured adapter
if (\class_exists($adapter)) {
    $controllerPath = sprintf('%s\Controller\ChallengeController', $pluginNamespace);
    \class_alias($adapter, $controllerPath);
} else {
    throw new \Cake\Http\Exception\InternalErrorException(sprintf("Adapter '%s' does not exist", $adapter));
}