232 lines
6.0 KiB
PHP
232 lines
6.0 KiB
PHP
<?php
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/**
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* DokuWiki media passthrough file
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*
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* @license GPL 2 (http://www.gnu.org/licenses/gpl.html)
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* @author Andreas Gohr <andi@splitbrain.org>
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*/
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if(!defined('DOKU_INC')) define('DOKU_INC',realpath(dirname(__FILE__).'/../../').'/');
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require_once(DOKU_INC.'inc/init.php');
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require_once(DOKU_INC.'inc/common.php');
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require_once(DOKU_INC.'inc/pageutils.php');
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require_once(DOKU_INC.'inc/confutils.php');
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require_once(DOKU_INC.'inc/auth.php');
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//close sesseion
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session_write_close();
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$mimetypes = getMimeTypes();
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//get input
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$MEDIA = $_REQUEST['media'];
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$CACHE = calc_cache($_REQUEST['cache']);
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$WIDTH = $_REQUEST['w'];
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$HEIGHT = $_REQUEST['h'];
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list($EXT,$MIME) = mimetype($MEDIA);
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if($EXT === false){
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$EXT = 'unknown';
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$MIME = 'application/octet-stream';
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}
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//media to local file
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if(preg_match('#^(https?|ftp)://#i',$MEDIA)){
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//handle external media
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$FILE = get_from_URL($MEDIA,$EXT,$CACHE);
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if(!$FILE){
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//download failed - redirect to original URL
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header('Location: '.$MEDIA);
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exit;
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}
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}else{
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$MEDIA = cleanID($MEDIA);
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if(empty($MEDIA)){
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header("HTTP/1.0 400 Bad Request");
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print 'Bad request';
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exit;
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}
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//check permissions (namespace only)
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if(auth_quickaclcheck(getNS($MEDIA).':X') < AUTH_READ){
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header("HTTP/1.0 401 Unauthorized");
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//fixme add some image for imagefiles
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print 'Unauthorized';
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exit;
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}
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$FILE = mediaFN($MEDIA);
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}
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//check file existance
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if(!@file_exists($FILE)){
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header("HTTP/1.0 404 Not Found");
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//FIXME add some default broken image
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print 'Not Found';
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exit;
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}
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//handle image resizing
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if((substr($MIME,0,5) == 'image') && $WIDTH){
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$FILE = get_resized($FILE,$EXT,$WIDTH,$HEIGHT);
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}
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//FIXME set sane cachecontrol headers
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//FIXME handle conditional and partial requests
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//send file
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header("Content-Type: $MIME");
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header('Last-Modified: '.date('r',filemtime($FILE)));
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header('Content-Length: '.filesize($FILE));
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header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
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//application mime type is downloadable
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if(substr($MIME,0,11) == 'application'){
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header('Content-Disposition: attachment; filename="'.basename($FILE).'"');
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}
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$fp = @fopen($FILE,"rb");
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if($fp){
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fpassthru($fp); //does a close itself
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}else{
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header("HTTP/1.0 500 Internal Server Error");
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print "Could not read $FILE - bad permissions?";
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}
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/* ------------------------------------------------------------------------ */
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/**
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* Resizes the given image to the given size
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*
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* @author Andreas Gohr <andi@splitbrain.org>
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*/
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function get_resized($file, $ext, $w, $h=0){
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global $conf;
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$info = getimagesize($file);
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if(!$h) $h = round(($w * $info[1]) / $info[0]);
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//cache
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$local = getCacheName($file,'.media.'.$w.'x'.$h.'.'.$ext);
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$mtime = @filemtime($local); // 0 if not exists
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if( $mtime > filemtime($file) || resize_image($ext,$file,$info[0],$info[1],$local,$w,$h) ){
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return $local;
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}
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//still here? resizing failed
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return $file;
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}
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/**
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* Returns the wanted cachetime in seconds
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*
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* Resolves named constants
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*
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* @author Andreas Gohr <andi@splitbrain.org>
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*/
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function calc_cache($cache){
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global $conf;
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if(strtolower($cache) == 'nocache') return 0; //never cache
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if(strtolower($cache) == 'recache') return $conf['cachetime']; //use standard cache
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return -1; //cache endless
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}
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/**
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* Download a remote file and return local filename
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*
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* returns false if download fails. Uses cached file if available and
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* wanted
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*
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* @author Andreas Gohr <andi@splitbrain.org>
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*/
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function get_from_URL($url,$ext,$cache){
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global $conf;
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$url = strtolower($url);
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$local = getCacheName($url,".media.$ext");
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$mtime = @filemtime($local); // 0 if not exists
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//decide if download needed:
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// never cache exists but no endless cache not exists or expired
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if( $cache == 0 || ($mtime != 0 && $cache != -1) || $mtime < time()-$cache ){
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if(io_download($url,$local)){
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return $local;
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}else{
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return false;
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}
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}
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//if cache exists use it else
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if($mtime) return $local;
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//else return false
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return false;
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}
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/**
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* resize images
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*
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* @author Andreas Gohr <andi@splitbrain.org>
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*/
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function resize_image($ext,$from,$from_w,$from_h,$to,$to_w,$to_h){
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global $conf;
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if($conf['gdlib'] < 1) return false; //no GDlib available or wanted
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// create an image of the given filetype
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if ($ext == 'jpg' || $ext == 'jpeg'){
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if(!function_exists("imagecreatefromjpeg")) return false;
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$image = @imagecreatefromjpeg($from);
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}elseif($ext == 'png') {
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if(!function_exists("imagecreatefrompng")) return false;
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$image = @imagecreatefrompng($from);
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}elseif($ext == 'gif') {
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if(!function_exists("imagecreatefromgif")) return false;
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$image = @imagecreatefromgif($from);
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}
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if(!$image) return false;
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if(($conf['gdlib']>1) && function_exists("imagecreatetruecolor")){
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$newimg = @imagecreatetruecolor ($to_w, $to_h);
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}
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if(!$newimg) $newimg = @imagecreate($to_w, $to_h);
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if(!$newimg) return false;
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//keep png alpha channel if possible
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if($ext == 'png' && $conf['gdlib']>1 && function_exists('imagesavealpha')){
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imagealphablending($newimg, false);
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imagesavealpha($newimg,true);
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}
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// create cachedir
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//io_makeFileDir($to); // not needed anymore, should exist
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//try resampling first
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if(function_exists("imagecopyresampled")){
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if(!@imagecopyresampled($newimg, $image, 0, 0, 0, 0, $to_w, $to_h, $from_w, $from_h)) {
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imagecopyresized($newimg, $image, 0, 0, 0, 0, $to_w, $to_h, $from_w, $from_h);
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}
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}else{
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imagecopyresized($newimg, $image, 0, 0, 0, 0, $to_w, $to_h, $from_w, $from_h);
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}
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if ($ext == 'jpg' || $ext == 'jpeg'){
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if(!function_exists("imagejpeg")) return false;
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return imagejpeg($newimg, $to, 70);
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}elseif($ext == 'png') {
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if(!function_exists("imagepng")) return false;
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return imagepng($newimg, $to);
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}elseif($ext == 'gif') {
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if(!function_exists("imagegif")) return false;
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return imagegif($newimg, $to);
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}
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return false;
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}
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//Setup VIM: ex: et ts=2 enc=utf-8 :
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?>
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