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  1: <?php
  2: 
  3: /**
  4:  * This file is part of the Nette Framework (http://nette.org)
  5:  * Copyright (c) 2004 David Grudl (http://davidgrudl.com)
  6:  */
  7: 
  8: namespace Nette\Http;
  9: 
 10: use Nette;
 11: 
 12: 
 13: /**
 14:  * HTTP-specific tasks.
 15:  *
 16:  * @property-read bool $modified
 17:  * @property-read IRequest $request
 18:  * @property-read IResponse $response
 19:  */
 20: class Context extends Nette\Object
 21: {
 22:     /** @var IRequest */
 23:     private $request;
 24: 
 25:     /** @var IResponse */
 26:     private $response;
 27: 
 28: 
 29:     public function __construct(IRequest $request, IResponse $response)
 30:     {
 31:         $this->request = $request;
 32:         $this->response = $response;
 33:     }
 34: 
 35: 
 36:     /**
 37:      * Attempts to cache the sent entity by its last modification date.
 38:      * @param  string|int|\DateTime  last modified time
 39:      * @param  string  strong entity tag validator
 40:      * @return bool
 41:      */
 42:     public function isModified($lastModified = NULL, $etag = NULL)
 43:     {
 44:         if ($lastModified) {
 45:             $this->response->setHeader('Last-Modified', Helpers::formatDate($lastModified));
 46:         }
 47:         if ($etag) {
 48:             $this->response->setHeader('ETag', '"' . addslashes($etag) . '"');
 49:         }
 50: 
 51:         $ifNoneMatch = $this->request->getHeader('If-None-Match');
 52:         if ($ifNoneMatch === '*') {
 53:             $match = TRUE; // match, check if-modified-since
 54: 
 55:         } elseif ($ifNoneMatch !== NULL) {
 56:             $etag = $this->response->getHeader('ETag');
 57: 
 58:             if ($etag == NULL || strpos(' ' . strtr($ifNoneMatch, ",\t", '  '), ' ' . $etag) === FALSE) {
 59:                 return TRUE;
 60: 
 61:             } else {
 62:                 $match = TRUE; // match, check if-modified-since
 63:             }
 64:         }
 65: 
 66:         $ifModifiedSince = $this->request->getHeader('If-Modified-Since');
 67:         if ($ifModifiedSince !== NULL) {
 68:             $lastModified = $this->response->getHeader('Last-Modified');
 69:             if ($lastModified != NULL && strtotime($lastModified) <= strtotime($ifModifiedSince)) {
 70:                 $match = TRUE;
 71: 
 72:             } else {
 73:                 return TRUE;
 74:             }
 75:         }
 76: 
 77:         if (empty($match)) {
 78:             return TRUE;
 79:         }
 80: 
 81:         $this->response->setCode(IResponse::S304_NOT_MODIFIED);
 82:         return FALSE;
 83:     }
 84: 
 85: 
 86:     /**
 87:      * @return IRequest
 88:      */
 89:     public function getRequest()
 90:     {
 91:         return $this->request;
 92:     }
 93: 
 94: 
 95:     /**
 96:      * @return IResponse
 97:      */
 98:     public function getResponse()
 99:     {
100:         return $this->response;
101:     }
102: 
103: }
104: 
Nette 2.3.8 API API documentation generated by ApiGen 2.8.0