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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',dirname(__FILE__).'/../../');
define('DOKU_DISABLE_GZIP_OUTPUT', 1);
require_once(DOKU_INC.'inc/init.php');
require_once(DOKU_INC.'inc/common.php');
require_once(DOKU_INC.'inc/media.php');
require_once(DOKU_INC.'inc/pageutils.php');
require_once(DOKU_INC.'inc/confutils.php');
require_once(DOKU_INC.'inc/auth.php');
//close sesseion
session_write_close();
if(!defined('CHUNK_SIZE')) define('CHUNK_SIZE',16*1024);
$mimetypes = getMimeTypes();
//get input
$MEDIA = stripctl(getID('media',false)); // no cleaning except control chars - maybe external
$CACHE = calc_cache($_REQUEST['cache']);
$WIDTH = (int) $_REQUEST['w'];
$HEIGHT = (int) $_REQUEST['h'];
list($EXT,$MIME,$DL) = mimetype($MEDIA);
if($EXT === false){
$EXT = 'unknown';
$MIME = 'application/octet-stream';
$DL = true;
}
//media to local file
if(preg_match('#^(https?)://#i',$MEDIA)){
//handle external images
if(strncmp($MIME,'image/',6) == 0) $FILE = media_get_from_URL($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
print 'Unauthorized';
exit;
}
$FILE = mediaFN($MEDIA);
}
//check file existance
if(!@file_exists($FILE)){
header("HTTP/1.0 404 Not Found");
//FIXME add some default broken image
print 'Not Found';
exit;
}
$ORIG = $FILE;
//handle image resizing/cropping
if((substr($MIME,0,5) == 'image') && $WIDTH){
if($HEIGHT){
$FILE = media_crop_image($FILE,$EXT,$WIDTH,$HEIGHT);
}else{
$FILE = media_resize_image($FILE,$EXT,$WIDTH,$HEIGHT);
}
}
// finally send the file to the client
$data = array('file' => $FILE,
'mime' => $MIME,
'download' => $DL,
'cache' => $CACHE,
'orig' => $ORIG,
'ext' => $EXT,
'width' => $WIDTH,
'height' => $HEIGHT);
$evt = new Doku_Event('MEDIA_SENDFILE', $data);
if ($evt->advise_before()) {
sendFile($data['file'],$data['mime'],$data['download'],$data['cache']);
}
/* ------------------------------------------------------------------------ */
/**
* Set headers and send the file to the client
*
* @author Andreas Gohr <andi@splitbrain.org>
* @author Ben Coburn <btcoburn@silicodon.net>
*/
function sendFile($file,$mime,$dl,$cache){
global $conf;
$fmtime = @filemtime($file);
// send headers
header("Content-Type: $mime");
// smart http caching headers
if ($cache==-1) {
// cache
// cachetime or one hour
header('Expires: '.gmdate("D, d M Y H:i:s", time()+max($conf['cachetime'], 3600)).' GMT');
header('Cache-Control: public, proxy-revalidate, no-transform, max-age='.max($conf['cachetime'], 3600));
header('Pragma: public');
} else if ($cache>0) {
// recache
// remaining cachetime + 10 seconds so the newly recached media is used
header('Expires: '.gmdate("D, d M Y H:i:s", $fmtime+$conf['cachetime']+10).' GMT');
header('Cache-Control: public, proxy-revalidate, no-transform, max-age='.max($fmtime-time()+$conf['cachetime']+10, 0));
header('Pragma: public');
} else if ($cache==0) {
// nocache
header('Cache-Control: must-revalidate, no-transform, post-check=0, pre-check=0');
header('Pragma: public');
}
//send important headers first, script stops here if '304 Not Modified' response
http_conditionalRequest($fmtime);
//download or display?
if($dl){
header('Content-Disposition: attachment; filename="'.basename($file).'";');
}else{
header('Content-Disposition: inline; filename="'.basename($file).'";');
}
//use x-sendfile header to pass the delivery to compatible webservers
if($conf['xsendfile'] == 1){
header("X-LIGHTTPD-send-file: $file");
exit;
}elseif($conf['xsendfile'] == 2){
header("X-Sendfile: $file");
exit;
}elseif($conf['xsendfile'] == 3){
header("X-Accel-Redirect: $file");
exit;
}
//support download continueing
header('Accept-Ranges: bytes');
list($start,$len) = http_rangeRequest(filesize($file));
// send file contents
$fp = @fopen($file,"rb");
if($fp){
fseek($fp,$start); //seek to start of range
$chunk = ($len > CHUNK_SIZE) ? CHUNK_SIZE : $len;
while (!feof($fp) && $chunk > 0) {
@set_time_limit(30); // large files can take a lot of time
print fread($fp, $chunk);
flush();
$len -= $chunk;
$chunk = ($len > CHUNK_SIZE) ? CHUNK_SIZE : $len;
}
fclose($fp);
}else{
header("HTTP/1.0 500 Internal Server Error");
print "Could not read $file - bad permissions?";
}
}
/**
* Checks and sets headers to handle range requets
*
* @author Andreas Gohr <andi@splitbrain.org>
* @returns array The start byte and the amount of bytes to send
*/
function http_rangeRequest($size){
if(!isset($_SERVER['HTTP_RANGE'])){
// no range requested - send the whole file
header("Content-Length: $size");
return array(0,$size);
}
$t = explode('=', $_SERVER['HTTP_RANGE']);
if (!$t[0]=='bytes') {
// we only understand byte ranges - send the whole file
header("Content-Length: $size");
return array(0,$size);
}
$r = explode('-', $t[1]);
$start = (int)$r[0];
$end = (int)$r[1];
if (!$end) $end = $size - 1;
if ($start > $end || $start > $size || $end > $size){
header('HTTP/1.1 416 Requested Range Not Satisfiable');
print 'Bad Range Request!';
exit;
}
$tot = $end - $start + 1;
header('HTTP/1.1 206 Partial Content');
header("Content-Range: bytes {$start}-{$end}/{$size}");
header("Content-Length: $tot");
return array($start,$tot);
}
/**
* Returns the wanted cachetime in seconds
*
* Resolves named constants
*
* @author Andreas Gohr <andi@splitbrain.org>
*/
function calc_cache($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
}
//Setup VIM: ex: et ts=2 enc=utf-8 :
?>
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