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Mise à jour de la librairie http-conditional

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Ajout d'un entête Expires qui ne devrait pas être nécessaire d'après la
spécification mais qui semble aider certains navigateurs
pull/322/head
Alexandre Alapetite 11 years ago
parent 123f8dd164
commit 665d22be76
1 changed files with 139 additions and 134 deletions
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  1. 273
      lib/http-conditional.php

273
lib/http-conditional.php
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@ -35,12 +35,12 @@
... //Rest of the script, just as you would do normally.
?>
Version 1.6.2a, 2008-03-06, http://alexandre.alapetite.fr/doc-alex/php-http-304/
Version 1.7 beta, 2013-11-03, http://alexandre.alapetite.fr/doc-alex/php-http-304/
------------------------------------------------------------------
Written by Alexandre Alapetite, http://alexandre.alapetite.fr/cv/
Copyright 2004-2008, Licence: Creative Commons "Attribution-ShareAlike 2.0 France" BY-SA (FR),
Copyright 2004-2013, Licence: Creative Commons "Attribution-ShareAlike 2.0 France" BY-SA (FR),
http://creativecommons.org/licenses/by-sa/2.0/fr/
http://alexandre.alapetite.fr/divers/apropos/#by-sa
- Attribution. You must give the original author credit
@ -57,151 +57,156 @@
*/
//In RSS/ATOM feedMode, contains the date of the clients last update.
$clientCacheDate=0; //Global public variable because PHP4 does not allow conditional arguments by reference
$_sessionMode=false; //Global private variable
$clientCacheDate=0; //Global public variable because PHP4 does not allow conditional arguments by reference
$_sessionMode=false; //Global private variable
function httpConditional($UnixTimeStamp,$cacheSeconds=0,$cachePrivacy=0,$feedMode=false,$compression=false,$session=false)
{//Credits: http://alexandre.alapetite.fr/doc-alex/php-http-304/
//RFC2616 HTTP/1.1: http://www.w3.org/Protocols/rfc2616/rfc2616.html
//RFC1945 HTTP/1.0: http://www.w3.org/Protocols/rfc1945/rfc1945.txt
if (headers_sent()) return false;
if (isset($_SERVER['SCRIPT_FILENAME'])) $scriptName=$_SERVER['SCRIPT_FILENAME'];
elseif (isset($_SERVER['PATH_TRANSLATED'])) $scriptName=$_SERVER['PATH_TRANSLATED'];
else return false;
if ((!$feedMode)&&(($modifScript=filemtime($scriptName))>$UnixTimeStamp))
$UnixTimeStamp=$modifScript;
$UnixTimeStamp=min($UnixTimeStamp,time());
$is304=true;
$is412=false;
$nbCond=0;
//rfc2616-sec3.html#sec3.3.1
$dateLastModif=gmdate('D, d M Y H:i:s \G\M\T',$UnixTimeStamp);
$dateCacheClient='Thu, 10 Jan 1980 20:30:40 GMT';
//rfc2616-sec14.html#sec14.19 //='"0123456789abcdef0123456789abcdef"'
if (isset($_SERVER['QUERY_STRING'])) $myQuery='?'.$_SERVER['QUERY_STRING'];
else $myQuery='';
if ($session&&isset($_SESSION))
{
global $_sessionMode;
$_sessionMode=$session;
$myQuery.=print_r($_SESSION,true).session_name().'='.session_id();
}
$etagServer='"'.md5($scriptName.$myQuery.'#'.$dateLastModif).'"';
if ((!$is412)&&isset($_SERVER['HTTP_IF_MATCH']))
{//rfc2616-sec14.html#sec14.24
$etagsClient=stripslashes($_SERVER['HTTP_IF_MATCH']);
$is412=(($etagClient!='*')&&(strpos($etagsClient,$etagServer)===false));
}
if ($is304&&isset($_SERVER['HTTP_IF_MODIFIED_SINCE']))
{//rfc2616-sec14.html#sec14.25 //rfc1945.txt
$nbCond++;
$dateCacheClient=$_SERVER['HTTP_IF_MODIFIED_SINCE'];
$p=strpos($dateCacheClient,';');
if ($p!==false)
$dateCacheClient=substr($dateCacheClient,0,$p);
$is304=($dateCacheClient==$dateLastModif);
}
if ($is304&&isset($_SERVER['HTTP_IF_NONE_MATCH']))
{//rfc2616-sec14.html#sec14.26
$nbCond++;
$etagClient=stripslashes($_SERVER['HTTP_IF_NONE_MATCH']);
$is304=(($etagClient==$etagServer)||($etagClient=='*'));
}
if ((!$is412)&&isset($_SERVER['HTTP_IF_UNMODIFIED_SINCE']))
{//rfc2616-sec14.html#sec14.28
$dateCacheClient=$_SERVER['HTTP_IF_UNMODIFIED_SINCE'];
$p=strpos($dateCacheClient,';');
if ($p!==false)
$dateCacheClient=substr($dateCacheClient,0,$p);
$is412=($dateCacheClient!=$dateLastModif);
}
if ($feedMode)
{//Special RSS/ATOM
global $clientCacheDate;
$clientCacheDate=strtotime($dateCacheClient);
$cachePrivacy=0;
}
if ($is412)
{//rfc2616-sec10.html#sec10.4.13
header('HTTP/1.1 412 Precondition Failed');
header('Cache-Control: private, max-age=0, must-revalidate');
header('Content-Type: text/plain');
echo "HTTP/1.1 Error 412 Precondition Failed: Precondition request failed positive evaluation\n";
return true;
}
elseif ($is304&&($nbCond>0))
{//rfc2616-sec10.html#sec10.3.5
header('HTTP/1.0 304 Not Modified');
header('Etag: '.$etagServer);
if ($feedMode) header('Connection: close'); //Comment this line under IIS
return true;
}
else
{//rfc2616-sec10.html#sec10.2.1
//rfc2616-sec14.html#sec14.3
if ($compression) ob_start('_httpConditionalCallBack'); //Will check HTTP_ACCEPT_ENCODING
//header('HTTP/1.0 200 OK');
if ($cacheSeconds<0)
{
$cache='private, no-cache, no-store, must-revalidate';
header('Pragma: no-cache');
}
else
{
if ($cacheSeconds==0) $cache='private, must-revalidate, ';
elseif ($cachePrivacy==0) $cache='private, ';
elseif ($cachePrivacy==2) $cache='public, ';
else $cache='';
$cache.='max-age='.floor($cacheSeconds);
}
//header('Expires: '.gmdate('D, d M Y H:i:s \G\M\T',time()+$cacheSeconds)); //HTTP/1.0 //rfc2616-sec14.html#sec14.21
header('Cache-Control: '.$cache); //rfc2616-sec14.html#sec14.9
header('Last-Modified: '.$dateLastModif);
header('Etag: '.$etagServer);
if ($feedMode) header('Connection: close'); //rfc2616-sec14.html#sec14.10 //Comment this line under IIS
return $_SERVER['REQUEST_METHOD']=='HEAD'; //rfc2616-sec9.html#sec9.4
}
//RFC2616 HTTP/1.1: http://www.w3.org/Protocols/rfc2616/rfc2616.html
//RFC1945 HTTP/1.0: http://www.w3.org/Protocols/rfc1945/rfc1945.txt
if (headers_sent()) return false;
if (isset($_SERVER['SCRIPT_FILENAME'])) $scriptName=$_SERVER['SCRIPT_FILENAME'];
elseif (isset($_SERVER['PATH_TRANSLATED'])) $scriptName=$_SERVER['PATH_TRANSLATED'];
else return false;
if ((!$feedMode)&&(($modifScript=filemtime($scriptName))>$UnixTimeStamp))
$UnixTimeStamp=$modifScript;
$UnixTimeStamp=min($UnixTimeStamp,time());
$is304=true;
$is412=false;
$nbCond=0;
//rfc2616-sec3.html#sec3.3.1
$dateLastModif=gmdate('D, d M Y H:i:s \G\M\T',$UnixTimeStamp);
$dateCacheClient='Thu, 10 Jan 1980 20:30:40 GMT';
//rfc2616-sec14.html#sec14.19 //='"0123456789abcdef0123456789abcdef"'
if (isset($_SERVER['QUERY_STRING'])) $myQuery='?'.$_SERVER['QUERY_STRING'];
else $myQuery='';
if ($session&&isset($_SESSION))
{
global $_sessionMode;
$_sessionMode=$session;
$myQuery.=print_r($_SESSION,true).session_name().'='.session_id();
}
$etagServer='"'.md5($scriptName.$myQuery.'#'.$dateLastModif).'"';
if ((!$is412)&&isset($_SERVER['HTTP_IF_MATCH']))
{//rfc2616-sec14.html#sec14.24
$etagsClient=stripslashes($_SERVER['HTTP_IF_MATCH']);
$is412=(($etagClient!=='*')&&(strpos($etagsClient,$etagServer)===false));
}
if ($is304&&isset($_SERVER['HTTP_IF_MODIFIED_SINCE']))
{//rfc2616-sec14.html#sec14.25 //rfc1945.txt
$nbCond++;
$dateCacheClient=$_SERVER['HTTP_IF_MODIFIED_SINCE'];
$p=strpos($dateCacheClient,';');
if ($p!==false)
$dateCacheClient=substr($dateCacheClient,0,$p);
$is304=($dateCacheClient==$dateLastModif);
}
if ($is304&&isset($_SERVER['HTTP_IF_NONE_MATCH']))
{//rfc2616-sec14.html#sec14.26
$nbCond++;
$etagClient=stripslashes($_SERVER['HTTP_IF_NONE_MATCH']);
$is304=(($etagClient===$etagServer)||($etagClient==='*'));
}
if ((!$is412)&&isset($_SERVER['HTTP_IF_UNMODIFIED_SINCE']))
{//rfc2616-sec14.html#sec14.28
$dateCacheClient=$_SERVER['HTTP_IF_UNMODIFIED_SINCE'];
$p=strpos($dateCacheClient,';');
if ($p!==false)
$dateCacheClient=substr($dateCacheClient,0,$p);
$is412=($dateCacheClient!==$dateLastModif);
}
if ($feedMode)
{//Special RSS/ATOM
global $clientCacheDate;
$clientCacheDate=strtotime($dateCacheClient);
$cachePrivacy=0;
}
if ($is412)
{//rfc2616-sec10.html#sec10.4.13
header('HTTP/1.1 412 Precondition Failed');
header('Cache-Control: private, max-age=0, must-revalidate');
header('Content-Type: text/plain');
echo "HTTP/1.1 Error 412 Precondition Failed: Precondition request failed positive evaluation\n";
return true;
}
elseif ($is304&&($nbCond>0))
{//rfc2616-sec10.html#sec10.3.5
header('HTTP/1.0 304 Not Modified');
header('Etag: '.$etagServer);
if ($feedMode) header('Connection: close'); //Comment this line under IIS
return true;
}
else
{//rfc2616-sec10.html#sec10.2.1
//rfc2616-sec14.html#sec14.3
if ($compression) ob_start('_httpConditionalCallBack'); //Will check HTTP_ACCEPT_ENCODING
//header('HTTP/1.0 200 OK');
if ($cacheSeconds<0)
{
$cache='private, no-cache, no-store, must-revalidate';
header('Expires: 0');
header('Pragma: no-cache');
}
else
{
if ($cacheSeconds===0)
{
$cache='private, must-revalidate, ';
header('Expires: 0');
}
elseif ($cachePrivacy===0) $cache='private, ';
elseif ($cachePrivacy===2) $cache='public, ';
else $cache='';
$cache.='max-age='.floor($cacheSeconds);
}
//header('Expires: '.gmdate('D, d M Y H:i:s \G\M\T',time()+$cacheSeconds)); //HTTP/1.0 //rfc2616-sec14.html#sec14.21
header('Cache-Control: '.$cache); //rfc2616-sec14.html#sec14.9
header('Last-Modified: '.$dateLastModif);
header('Etag: '.$etagServer);
if ($feedMode) header('Connection: close'); //rfc2616-sec14.html#sec14.10 //Comment this line under IIS
return $_SERVER['REQUEST_METHOD']==='HEAD'; //rfc2616-sec9.html#sec9.4
}
}
function _httpConditionalCallBack($buffer,$mode=5)
{//Private function automatically called at the end of the script when compression is enabled
//rfc2616-sec14.html#sec14.11
//You can adjust the level of compression with zlib.output_compression_level in php.ini
if (extension_loaded('zlib')&&(!ini_get('zlib.output_compression')))
{
$buffer2=ob_gzhandler($buffer,$mode); //Will check HTTP_ACCEPT_ENCODING and put correct headers such as Vary //rfc2616-sec14.html#sec14.44
if (strlen($buffer2)>1) //When ob_gzhandler succeeded
$buffer=$buffer2;
}
header('Content-Length: '.strlen($buffer)); //Allows persistant connections //rfc2616-sec14.html#sec14.13
return $buffer;
//rfc2616-sec14.html#sec14.11
//You can adjust the level of compression with zlib.output_compression_level in php.ini
if (extension_loaded('zlib')&&(!ini_get('zlib.output_compression')))
{
$buffer2=ob_gzhandler($buffer,$mode); //Will check HTTP_ACCEPT_ENCODING and put correct headers such as Vary //rfc2616-sec14.html#sec14.44
if (strlen($buffer2)>1) //When ob_gzhandler succeeded
$buffer=$buffer2;
}
header('Content-Length: '.strlen($buffer)); //Allows persistant connections //rfc2616-sec14.html#sec14.13
return $buffer;
}
function httpConditionalRefresh($UnixTimeStamp)
{//Update HTTP headers if the content has just been modified by the client's request
//See an example on http://alexandre.alapetite.fr/doc-alex/compteur/
if (headers_sent()) return false;
//See an example on http://alexandre.alapetite.fr/doc-alex/compteur/
if (headers_sent()) return false;
if (isset($_SERVER['SCRIPT_FILENAME'])) $scriptName=$_SERVER['SCRIPT_FILENAME'];
elseif (isset($_SERVER['PATH_TRANSLATED'])) $scriptName=$_SERVER['PATH_TRANSLATED'];
else return false;
if (isset($_SERVER['SCRIPT_FILENAME'])) $scriptName=$_SERVER['SCRIPT_FILENAME'];
elseif (isset($_SERVER['PATH_TRANSLATED'])) $scriptName=$_SERVER['PATH_TRANSLATED'];
else return false;
$dateLastModif=gmdate('D, d M Y H:i:s \G\M\T',$UnixTimeStamp);
$dateLastModif=gmdate('D, d M Y H:i:s \G\M\T',$UnixTimeStamp);
if (isset($_SERVER['QUERY_STRING'])) $myQuery='?'.$_SERVER['QUERY_STRING'];
else $myQuery='';
global $_sessionMode;
if ($_sessionMode&&isset($_SESSION))
$myQuery.=print_r($_SESSION,true).session_name().'='.session_id();
$etagServer='"'.md5($scriptName.$myQuery.'#'.$dateLastModif).'"';
if (isset($_SERVER['QUERY_STRING'])) $myQuery='?'.$_SERVER['QUERY_STRING'];
else $myQuery='';
global $_sessionMode;
if ($_sessionMode&&isset($_SESSION))
$myQuery.=print_r($_SESSION,true).session_name().'='.session_id();
$etagServer='"'.md5($scriptName.$myQuery.'#'.$dateLastModif).'"';
header('Last-Modified: '.$dateLastModif);
header('Etag: '.$etagServer);
header('Last-Modified: '.$dateLastModif);
header('Etag: '.$etagServer);
}

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