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  1: <?php
  2: 
  3: /**
  4:  * This file is part of the Nette Framework (http://nette.org)
  5:  *
  6:  * Copyright (c) 2004 David Grudl (http://davidgrudl.com)
  7:  *
  8:  * For the full copyright and license information, please view
  9:  * the file license.txt that was distributed with this source code.
 10:  */
 11: 
 12: namespace Nette\Http;
 13: 
 14: use Nette;
 15: 
 16: 
 17: /**
 18:  * HTTP-specific tasks.
 19:  *
 20:  * @author     David Grudl
 21:  *
 22:  * @property-read bool $modified
 23:  * @property-read IRequest $request
 24:  * @property-read IResponse $response
 25:  */
 26: class Context extends Nette\Object
 27: {
 28:     /** @var IRequest */
 29:     private $request;
 30: 
 31:     /** @var IResponse */
 32:     private $response;
 33: 
 34: 
 35:     public function __construct(IRequest $request, IResponse $response)
 36:     {
 37:         $this->request = $request;
 38:         $this->response = $response;
 39:     }
 40: 
 41: 
 42:     /**
 43:      * Attempts to cache the sent entity by its last modification date.
 44:      * @param  string|int|DateTime  last modified time
 45:      * @param  string  strong entity tag validator
 46:      * @return bool
 47:      */
 48:     public function isModified($lastModified = NULL, $etag = NULL)
 49:     {
 50:         if ($lastModified) {
 51:             $this->response->setHeader('Last-Modified', $this->response->date($lastModified));
 52:         }
 53:         if ($etag) {
 54:             $this->response->setHeader('ETag', '"' . addslashes($etag) . '"');
 55:         }
 56: 
 57:         $ifNoneMatch = $this->request->getHeader('If-None-Match');
 58:         if ($ifNoneMatch === '*') {
 59:             $match = TRUE; // match, check if-modified-since
 60: 
 61:         } elseif ($ifNoneMatch !== NULL) {
 62:             $etag = $this->response->getHeader('ETag');
 63: 
 64:             if ($etag == NULL || strpos(' ' . strtr($ifNoneMatch, ",\t", '  '), ' ' . $etag) === FALSE) {
 65:                 return TRUE;
 66: 
 67:             } else {
 68:                 $match = TRUE; // match, check if-modified-since
 69:             }
 70:         }
 71: 
 72:         $ifModifiedSince = $this->request->getHeader('If-Modified-Since');
 73:         if ($ifModifiedSince !== NULL) {
 74:             $lastModified = $this->response->getHeader('Last-Modified');
 75:             if ($lastModified != NULL && strtotime($lastModified) <= strtotime($ifModifiedSince)) {
 76:                 $match = TRUE;
 77: 
 78:             } else {
 79:                 return TRUE;
 80:             }
 81:         }
 82: 
 83:         if (empty($match)) {
 84:             return TRUE;
 85:         }
 86: 
 87:         $this->response->setCode(IResponse::S304_NOT_MODIFIED);
 88:         return FALSE;
 89:     }
 90: 
 91: 
 92:     /**
 93:      * @return IRequest
 94:      */
 95:     public function getRequest()
 96:     {
 97:         return $this->request;
 98:     }
 99: 
100: 
101:     /**
102:      * @return IResponse
103:      */
104:     public function getResponse()
105:     {
106:         return $this->response;
107:     }
108: 
109: }
110: 
Nette Framework 2.0.12 API API documentation generated by ApiGen 2.8.0