--- /dev/null
+<?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);
+ }
+
+}