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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:  * @package Nette\Http
 11:  */
 12: 
 13: 
 14: 
 15: /**
 16:  * HTTP-specific tasks.
 17:  *
 18:  * @author     David Grudl
 19:  *
 20:  * @property-read bool $modified
 21:  * @property-read IHttpRequest $request
 22:  * @property-read IHttpResponse $response
 23:  * @package Nette\Http
 24:  */
 25: class NHttpContext extends NObject
 26: {
 27:     /** @var IHttpRequest */
 28:     private $request;
 29: 
 30:     /** @var IHttpResponse */
 31:     private $response;
 32: 
 33: 
 34: 
 35:     public function __construct(IHttpRequest $request, IHttpResponse $response)
 36:     {
 37:         $this->request = $request;
 38:         $this->response = $response;
 39:     }
 40: 
 41: 
 42: 
 43:     /**
 44:      * Attempts to cache the sent entity by its last modification date.
 45:      * @param  string|int|DateTime  last modified time
 46:      * @param  string  strong entity tag validator
 47:      * @return bool
 48:      */
 49:     public function isModified($lastModified = NULL, $etag = NULL)
 50:     {
 51:         if ($lastModified) {
 52:             $this->response->setHeader('Last-Modified', $this->response->date($lastModified));
 53:         }
 54:         if ($etag) {
 55:             $this->response->setHeader('ETag', '"' . addslashes($etag) . '"');
 56:         }
 57: 
 58:         $ifNoneMatch = $this->request->getHeader('If-None-Match');
 59:         if ($ifNoneMatch === '*') {
 60:             $match = TRUE; // match, check if-modified-since
 61: 
 62:         } elseif ($ifNoneMatch !== NULL) {
 63:             $etag = $this->response->getHeader('ETag');
 64: 
 65:             if ($etag == NULL || strpos(' ' . strtr($ifNoneMatch, ",\t", '  '), ' ' . $etag) === FALSE) {
 66:                 return TRUE;
 67: 
 68:             } else {
 69:                 $match = TRUE; // match, check if-modified-since
 70:             }
 71:         }
 72: 
 73:         $ifModifiedSince = $this->request->getHeader('If-Modified-Since');
 74:         if ($ifModifiedSince !== NULL) {
 75:             $lastModified = $this->response->getHeader('Last-Modified');
 76:             if ($lastModified != NULL && strtotime($lastModified) <= strtotime($ifModifiedSince)) {
 77:                 $match = TRUE;
 78: 
 79:             } else {
 80:                 return TRUE;
 81:             }
 82:         }
 83: 
 84:         if (empty($match)) {
 85:             return TRUE;
 86:         }
 87: 
 88:         $this->response->setCode(IHttpResponse::S304_NOT_MODIFIED);
 89:         return FALSE;
 90:     }
 91: 
 92: 
 93: 
 94:     /**
 95:      * @return IHttpRequest
 96:      */
 97:     public function getRequest()
 98:     {
 99:         return $this->request;
100:     }
101: 
102: 
103: 
104:     /**
105:      * @return IHttpResponse
106:      */
107:     public function getResponse()
108:     {
109:         return $this->response;
110:     }
111: 
112: }
113: 
Nette Framework 2.0.10 (for PHP 5.2, prefixed) API API documentation generated by ApiGen 2.8.0