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