silverstripe-framework/src/Control/RequestProcessor.php

<?php

namespace SilverStripe\Control;

use SilverStripe\Core\Injector\Injectable;
use SilverStripe\ORM\DataModel;

/**
 * Represents a request processer that delegates pre and post request handling to nested request filters
 */
class RequestProcessor implements RequestFilter {
	use Injectable;

	/**
	 * List of currently assigned request filters
	 *
	 * @var array
	 */
	private $filters = array();

	public function __construct($filters = array()) {
		$this->filters = $filters;
	}

	/**
	 * Assign a list of request filters
	 *
	 * @param array $filters
	 */
	public function setFilters($filters) {
		$this->filters = $filters;
	}

	public function preRequest(HTTPRequest $request, Session $session, DataModel $model) {
		foreach ($this->filters as $filter) {
			$res = $filter->preRequest($request, $session, $model);
			if ($res === false) {
				return false;
			}
		}
		return null;
	}

	public function postRequest(HTTPRequest $request, HTTPResponse $response, DataModel $model) {
		foreach ($this->filters as $filter) {
			$res = $filter->postRequest($request, $response, $model);
			if ($res === false) {
				return false;
			}
		}
		return null;
	}
}