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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');
//close session
session_write_close();
$mimetypes = getMimeTypes();
//get input
$MEDIA = stripctl(getID('media',false)); // no cleaning except control chars - maybe external
$CACHE = calc_cache($INPUT->str('cache'));
$WIDTH = $INPUT->int('w');
$HEIGHT = $INPUT->int('h');
$REV = &$INPUT->ref('rev');
//sanitize revision
$REV = preg_replace('/[^0-9]/','',$REV);
list($EXT,$MIME,$DL) = mimetype($MEDIA,false);
if($EXT === false){
$EXT = 'unknown';
$MIME = 'application/octet-stream';
$DL = true;
}
// check for permissions, preconditions and cache external files
list($STATUS, $STATUSMESSAGE) = checkFileStatus($MEDIA, $FILE, $REV);
// prepare data for plugin events
$data = array('media' => $MEDIA,
'file' => $FILE,
'orig' => $FILE,
'mime' => $MIME,
'download' => $DL,
'cache' => $CACHE,
'ext' => $EXT,
'width' => $WIDTH,
'height' => $HEIGHT,
'status' => $STATUS,
'statusmessage' => $STATUSMESSAGE,
);
// handle the file status
$evt = new Doku_Event('FETCH_MEDIA_STATUS', $data);
if ( $evt->advise_before() ) {
// redirects
if($data['status'] > 300 && $data['status'] <= 304){
send_redirect($data['statusmessage']);
}
// send any non 200 status
if($data['status'] != 200){
header('HTTP/1.0 ' . $data['status'] . ' ' . $data['statusmessage']);
}
// die on errors
if($data['status'] > 203){
print $data['statusmessage'];
exit;
}
}
$evt->advise_after();
unset($evt);
//handle image resizing/cropping
if((substr($MIME,0,5) == 'image') && $WIDTH){
if($HEIGHT){
$data['file'] = $FILE = media_crop_image($data['file'],$EXT,$WIDTH,$HEIGHT);
}else{
$data['file'] = $FILE = media_resize_image($data['file'],$EXT,$WIDTH,$HEIGHT);
}
}
// finally send the file to the client
$evt = new Doku_Event('MEDIA_SENDFILE', $data);
if ($evt->advise_before()) {
sendFile($data['file'],$data['mime'],$data['download'],$data['cache']);
}
// Do something after the download finished.
$evt->advise_after();
/* ------------------------------------------------------------------------ */
/**
* Set headers and send the file to the client
*
* @author Andreas Gohr <andi@splitbrain.org>
* @author Ben Coburn <btcoburn@silicodon.net>
*/
function sendFile($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($dl){
header('Content-Disposition: attachment; filename="'.utf8_basename($file).'";');
}else{
header('Content-Disposition: inline; filename="'.utf8_basename($file).'";');
}
//use x-sendfile header to pass the delivery to compatible webservers
if (http_sendfile($file)) exit;
// send file contents
$fp = @fopen($file,"rb");
if($fp){
http_rangeRequest($fp,filesize($file),$mime);
}else{
header("HTTP/1.0 500 Internal Server Error");
print "Could not read $file - bad permissions?";
}
}
/**
* Check for media for preconditions and return correct status code
*
* READ: MEDIA, MIME, EXT, CACHE
* WRITE: MEDIA, FILE, array( STATUS, STATUSMESSAGE )
*
* @author Gerry Weissbach <gerry.w@gammaproduction.de>
* @param $media reference to the media id
* @param $file reference to the file variable
* @returns array(STATUS, STATUSMESSAGE)
*/
function checkFileStatus(&$media, &$file, $rev='') {
global $MIME, $EXT, $CACHE, $INPUT;
//media to local file
if(preg_match('#^(https?)://#i',$media)){
//check hash
if(substr(md5(auth_cookiesalt().$media),0,6) != $INPUT->str('hash')){
return array( 412, 'Precondition Failed');
}
//handle external images
if(strncmp($MIME,'image/',6) == 0) $file = media_get_from_URL($media,$EXT,$CACHE);
if(!$file){
//download failed - redirect to original URL
return array( 302, $media );
}
}else{
$media = cleanID($media);
if(empty($media)){
return array( 400, 'Bad request' );
}
//check permissions (namespace only)
if(auth_quickaclcheck(getNS($media).':X') < AUTH_READ){
return array( 403, 'Forbidden' );
}
$file = mediaFN($media, $rev);
}
//check file existance
if(!@file_exists($file)){
return array( 404, 'Not Found' );
}
return array(200, null);
}
/**
* 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 :
|
