1: <?php
  2: /**
  3:  * CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
  4:  * Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
  5:  *
  6:  * Licensed under The MIT License
  7:  * For full copyright and license information, please see the LICENSE.txt
  8:  * Redistributions of files must retain the above copyright notice.
  9:  *
 10:  * @copyright     Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
 11:  * @link          http://cakephp.org CakePHP(tm) Project
 12:  * @package       Cake.Routing
 13:  * @since         CakePHP(tm) v 2.2
 14:  * @license       http://www.opensource.org/licenses/mit-license.php MIT License
 15:  */
 16: 
 17: App::uses('DispatcherFilter', 'Routing');
 18: 
 19: /**
 20:  * Filters a request and tests whether it is a file in the webroot folder or not and
 21:  * serves the file to the client if appropriate.
 22:  *
 23:  * @package Cake.Routing.Filter
 24:  */
 25: class AssetDispatcher extends DispatcherFilter {
 26: 
 27: /**
 28:  * Default priority for all methods in this filter
 29:  * This filter should run before the request gets parsed by router
 30:  *
 31:  * @var int
 32:  */
 33:     public $priority = 9;
 34: 
 35: /**
 36:  * Checks if a requested asset exists and sends it to the browser
 37:  *
 38:  * @param CakeEvent $event containing the request and response object
 39:  * @return mixed The resulting response.
 40:  * @throws NotFoundException When asset not found
 41:  */
 42:     public function beforeDispatch(CakeEvent $event) {
 43:         $url = urldecode($event->data['request']->url);
 44:         if (strpos($url, '..') !== false || strpos($url, '.') === false) {
 45:             return;
 46:         }
 47: 
 48:         if ($result = $this->_filterAsset($event)) {
 49:             $event->stopPropagation();
 50:             return $result;
 51:         }
 52: 
 53:         $assetFile = $this->_getAssetFile($url);
 54:         if ($assetFile === null || !file_exists($assetFile)) {
 55:             return null;
 56:         }
 57:         $response = $event->data['response'];
 58:         $event->stopPropagation();
 59: 
 60:         $response->modified(filemtime($assetFile));
 61:         if ($response->checkNotModified($event->data['request'])) {
 62:             return $response;
 63:         }
 64: 
 65:         $pathSegments = explode('.', $url);
 66:         $ext = array_pop($pathSegments);
 67: 
 68:         $this->_deliverAsset($response, $assetFile, $ext);
 69:         return $response;
 70:     }
 71: 
 72: /**
 73:  * Checks if the client is requesting a filtered asset and runs the corresponding
 74:  * filter if any is configured
 75:  *
 76:  * @param CakeEvent $event containing the request and response object
 77:  * @return CakeResponse if the client is requesting a recognized asset, null otherwise
 78:  */
 79:     protected function _filterAsset(CakeEvent $event) {
 80:         $url = $event->data['request']->url;
 81:         $response = $event->data['response'];
 82:         $filters = Configure::read('Asset.filter');
 83:         $isCss = (
 84:             strpos($url, 'ccss/') === 0 ||
 85:             preg_match('#^(theme/([^/]+)/ccss/)|(([^/]+)(?<!css)/ccss)/#i', $url)
 86:         );
 87:         $isJs = (
 88:             strpos($url, 'cjs/') === 0 ||
 89:             preg_match('#^/((theme/[^/]+)/cjs/)|(([^/]+)(?<!js)/cjs)/#i', $url)
 90:         );
 91: 
 92:         if (($isCss && empty($filters['css'])) || ($isJs && empty($filters['js']))) {
 93:             $response->statusCode(404);
 94:             return $response;
 95:         }
 96: 
 97:         if ($isCss) {
 98:             include WWW_ROOT . DS . $filters['css'];
 99:             return $response;
100:         }
101: 
102:         if ($isJs) {
103:             include WWW_ROOT . DS . $filters['js'];
104:             return $response;
105:         }
106:     }
107: 
108: /**
109:  * Builds asset file path based off url
110:  *
111:  * @param string $url URL
112:  * @return string Absolute path for asset file
113:  */
114:     protected function _getAssetFile($url) {
115:         $parts = explode('/', $url);
116:         if ($parts[0] === 'theme') {
117:             $themeName = $parts[1];
118:             unset($parts[0], $parts[1]);
119:             $fileFragment = implode(DS, $parts);
120:             $path = App::themePath($themeName) . 'webroot' . DS;
121:             return $path . $fileFragment;
122:         }
123: 
124:         $plugin = Inflector::camelize($parts[0]);
125:         if ($plugin && CakePlugin::loaded($plugin)) {
126:             unset($parts[0]);
127:             $fileFragment = implode(DS, $parts);
128:             $pluginWebroot = CakePlugin::path($plugin) . 'webroot' . DS;
129:             return $pluginWebroot . $fileFragment;
130:         }
131:     }
132: 
133: /**
134:  * Sends an asset file to the client
135:  *
136:  * @param CakeResponse $response The response object to use.
137:  * @param string $assetFile Path to the asset file in the file system
138:  * @param string $ext The extension of the file to determine its mime type
139:  * @return void
140:  */
141:     protected function _deliverAsset(CakeResponse $response, $assetFile, $ext) {
142:         ob_start();
143:         $compressionEnabled = Configure::read('Asset.compress') && $response->compress();
144:         if ($response->type($ext) === $ext) {
145:             $contentType = 'application/octet-stream';
146:             $agent = env('HTTP_USER_AGENT');
147:             if (preg_match('%Opera(/| )([0-9].[0-9]{1,2})%', $agent) || preg_match('/MSIE ([0-9].[0-9]{1,2})/', $agent)) {
148:                 $contentType = 'application/octetstream';
149:             }
150:             $response->type($contentType);
151:         }
152:         if (!$compressionEnabled) {
153:             $response->header('Content-Length', filesize($assetFile));
154:         }
155:         $response->cache(filemtime($assetFile));
156:         $response->send();
157:         ob_clean();
158:         if ($ext === 'css' || $ext === 'js') {
159:             include $assetFile;
160:         } else {
161:             readfile($assetFile);
162:         }
163: 
164:         if ($compressionEnabled) {
165:             ob_end_flush();
166:         }
167:     }
168: 
169: }
170: