AggregatorTestRssController.php

<?php

namespace Drupal\aggregator_test\Controller;

use Drupal\Component\Datetime\DateTimePlus;
use Drupal\Core\Controller\ControllerBase;
use Drupal\Component\Utility\Crypt;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\HttpFoundation\Request;

/**
 * Controller for the aggregator_test module.
 */
class AggregatorTestRssController extends ControllerBase {
    
    /**
     * Generates a test feed and simulates last-modified and etags.
     *
     * @param bool $use_last_modified
     *   Set TRUE to send a last modified header.
     * @param bool $use_etag
     *   Set TRUE to send an etag.
     * @param \Symfony\Component\HttpFoundation\Request $request
     *   Information about the current HTTP request.
     *
     * @return \Symfony\Component\HttpFoundation\Response
     *   A feed that forces cache validation.
     */
    public function testFeed($use_last_modified, $use_etag, Request $request) {
        $response = new Response();
        $last_modified = strtotime('Sun, 19 Nov 1978 05:00:00 GMT');
        $etag = Crypt::hashBase64($last_modified);
        $if_modified_since = strtotime($request->server
            ->get('HTTP_IF_MODIFIED_SINCE', ''));
        $if_none_match = stripslashes($request->server
            ->get('HTTP_IF_NONE_MATCH', ''));
        // Send appropriate response. We respond with a 304 not modified on either
        // etag or on last modified.
        if ($use_last_modified) {
            $response->headers
                ->set('Last-Modified', gmdate(DateTimePlus::RFC7231, $last_modified));
        }
        if ($use_etag) {
            $response->headers
                ->set('ETag', $etag);
        }
        // Return 304 not modified if either last modified or etag match.
        if ($last_modified == $if_modified_since || $etag == $if_none_match) {
            $response->setStatusCode(304);
            return $response;
        }
        // The following headers force validation of cache.
        $response->headers
            ->set('Expires', 'Sun, 19 Nov 1978 05:00:00 GMT');
        $response->headers
            ->set('Cache-Control', 'must-revalidate');
        $response->headers
            ->set('Content-Type', 'application/rss+xml; charset=utf-8');
        // Read actual feed from file.
        $file_name = __DIR__ . '/../../aggregator_test_rss091.xml';
        $handle = fopen($file_name, 'r');
        $feed = fread($handle, filesize($file_name));
        fclose($handle);
        $response->setContent($feed);
        return $response;
    }
    
    /**
     * Generates a rest redirect to the test feed.
     *
     * @return \Symfony\Component\HttpFoundation\RedirectResponse
     *   A response that redirects users to the test feed.
     */
    public function testRedirect() {
        return $this->redirect('aggregator_test.feed', [], [], 301);
    }

}