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<?php
/**
* DokuWiki media passthrough file
*
* @license GPL 2 (http://www.gnu.org/licenses/gpl.html)
* @author Andreas Gohr <andi@splitbrain.org>
*/
if(!defined('DOKU_INC')) define('DOKU_INC',realpath(dirname(__FILE__)).'/');
require_once(DOKU_INC.'inc/init.php');
require_once(DOKU_INC.'inc/common.php');
require_once(DOKU_INC.'inc/auth.php');
//get input
$MEDIA = $_REQUEST['media'];
$CACHE = calc_cache($_REQUEST['cache']);
$WIDTH = $_REQUEST['w'];
$HEIGHT = $_REQUEST['h'];
$EXT = media_extension($MEDIA);
//media to local file
if(preg_match('#^(https?|ftp)://#i',$MEDIA)){
//handle external media
$FILE = get_from_URL($MEDIA,$EXT,$CACHE);
if(!$FILE){
//download failed - redirect to original URL
header('Location: '.$MEDIA);
exit;
}
}else{
$MEDIA = cleanID($MEDIA);
if(empty($MEDIA)){
header("HTTP/1.0 400 Bad Request");
print 'Bad request';
exit;
}
//check permissions (namespace only)
if(auth_quickaclcheck(getNS($MEDIA).':X') < AUTH_READ){
header("HTTP/1.0 401 Unauthorized");
//fixme add some image for imagefiles else display login message
exit;
}
$FILE = mediaFN($MEDIA);
}
//check file existance
if(!@file_exists($FILE)){
header("HTTP/1.0 404 Not Found");
//FIXME add some default broken image or display message
exit;
}
//FIXME handle image resizing
//FIXME add correct mimetype
//FIXME send Size header
//FIXME send Lastmod Handler
//FIXME cache headers??
//FIXME handle conditional and partial requests
//send file
passthru($FILE) ;
/* ----------- */
/**
* Returns the wanted cachetime in seconds
*
* Resolves named constants
*
* @author Andreas Gohr <andi@splitbrain.org>
*/
function calc_cache($cache){
global $conf;
if(strtolower($cache) == 'nocache') return 0; //never cache
if(strtolower($cache) == 'recache') return $conf['cachetime']; //use standard cache
return -1; //cache endless
}
/**
* Download a remote file and return local filename
*
* returns false if download fails. Uses cached file if available and
* wanted
*
* @author Andreas Gohr <andi@splitbrain.org>
*/
function get_from_URL($url,$ext,$cache){
global $conf;
$url = strtolower($url);
$md5 = md5($url);
$local = $conf['mediadir']."/_cache/$md5.$ext";
$mtime = @filemtime($local); // 0 if not exists
//decide if download needed:
// never cache exists but no endless cache not exists or expired
if( $cache == 0 || ($mtime != 0 && $cache != -1) || $mtime < time()-$cache ){
if(download($url,$local)){
return $local;
}else{
return false;
}
}
//if cache exists use it else
if($mtime) return $local;
//else return false
return false;
}
//Setup VIM: ex: et ts=2 enc=utf-8 :
?>
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