143 lines
3.5 KiB
PHP
143 lines
3.5 KiB
PHP
<?php
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/**
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* The Legend of Z
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*
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* @author Oliver Hanraths <oliver.hanraths@uni-duesseldorf.de>
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* @copyright 2014 Heinrich-Heine-Universität Düsseldorf
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* @license http://www.gnu.org/licenses/gpl.html
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* @link https://bitbucket.org/coderkun/the-legend-of-z
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*/
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namespace hhu\z\controllers;
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/**
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* Controller of the MediaAgent to process and show Media.
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*
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* @author Oliver Hanraths <oliver.hanraths@uni-duesseldorf.de>
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*/
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class MediaController extends \hhu\z\controllers\SeminaryRoleController
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{
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/**
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* User permissions
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*
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* @var array
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*/
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public $permissions = array(
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'index' => array('admin', 'moderator', 'user')
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);
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/**
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* User seminary permissions
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*
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* @var array
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*/
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public $seminaryPermissions = array(
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'index' => array('admin', 'moderator', 'user')
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);
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/**
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* Required models
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*
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* @var array
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*/
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public $models = array('seminaries', 'media');
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/**
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* Prefilter.
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*
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* @param Request $request Current request
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* @param Response $response Current response
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*/
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public function preFilter(\nre\core\Request $request, \nre\core\Response $response)
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{
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parent::preFilter($request, $response);
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// Set headers for caching control
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$response->addHeader("Pragma: public");
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$response->addHeader("Cache-control: public, max-age=".(60*60*24));
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$response->addHeader("Expires: ".gmdate('r', time()+(60*60*24)));
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$response->addHeader("Date: ".gmdate(\DateTime::RFC822));
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}
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/**
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* Action: index.
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*
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* Display a medium without processing.
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*
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* @throws IdNotFoundException
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* @param string $seminaryUrl URL-title of the Seminary
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* @param string $mediaUrl URL-name of the medium
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*/
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public function index($seminaryUrl, $mediaUrl)
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{
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// Get Seminary
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$seminary = $this->Seminaries->getSeminaryByUrl($seminaryUrl);
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// Get Media
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$media = $this->Media->getMediaByUrl($seminary['id'], $mediaUrl);
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// Set content-type
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$this->response->addHeader("Content-type: ".$media['mimetype']."");
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// Set filename
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$media['filename'] = ROOT.DS.\nre\configs\AppConfig::$dirs['media'].DS.$media['id'];
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if(!file_exists($media['filename'])) {
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throw new \nre\exceptions\IdNotFoundException($mediaUrl);
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}
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// Cache
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if($this->setCacheHeaders($media['filename'])) {
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return;
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}
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// Pass data to view
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$this->set('media', $media);
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}
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/**
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* Determine file information and set the HTTP-header for
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* caching accordingly.
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*
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* @param string $fileName Filename
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* @return boolean HTTP-status 304 was set (in cache)
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*/
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private function setCacheHeaders($fileName)
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{
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// Determine last change of file
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$fileLastModified = gmdate('r', filemtime($fileName));
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// Generate E-Tag
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$fileEtag = hash('sha256', $fileLastModified.$fileName);
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// Set header
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$this->response->addHeader("Last-Modified: ".$fileLastModified);
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$this->response->addHeader("Etag: ".$fileEtag);
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// HTTP-status
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$headerModifiedSince = $this->request->getServerParam('HTTP_IF_MODIFIED_SINCE');
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$headerNoneMatch = $this->request->getServerParam('HTTP_IF_NONE_MATCH');
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if(
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!is_null($headerModifiedSince) && $fileLastModified < strtotime($headerModifiedSince) &&
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!is_null($headerNoneMatch) && $headerNoneMatch == $fileEtag
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) {
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$this->response->setExit(true);
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$this->response->addHeader(\nre\core\WebUtils::getHttpHeader(304));
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return true;
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}
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return false;
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}
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}
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?>
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