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-rw-r--r--plugins/dokuwiki/lib/exe/fetch.php433
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diff --git a/plugins/dokuwiki/lib/exe/fetch.php b/plugins/dokuwiki/lib/exe/fetch.php
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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>
+ */
+
+# security hotfix
+die();
+
+ if(!defined('DOKU_INC')) define('DOKU_INC',realpath(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/pageutils.php');
+ require_once(DOKU_INC.'inc/confutils.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,$MIME) = mimetype($MEDIA);
+ if($EXT === false){
+ $EXT = 'unknown';
+ $MIME = 'application/octet-stream';
+ }
+
+ //media to local file
+ if(preg_match('#^(https?)://#i',$MEDIA)){
+ //handle external images
+ if(strncmp($MIME,'image/',6) == 0) $FILE = get_from_URL($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;
+ }
+
+ $FILE = mediaFN($MEDIA);
+ }
+
+ //check file existance
+ if(!@file_exists($FILE)){
+ header("HTTP/1.0 404 Not Found");
+ //FIXME add some default broken image
+ print 'Not Found';
+ exit;
+ }
+
+ //handle image resizing
+ if((substr($MIME,0,5) == 'image') && $WIDTH){
+ $FILE = get_resized($FILE,$EXT,$WIDTH,$HEIGHT);
+ }
+
+ // finally send the file to the client
+ sendFile($FILE,$MIME,$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,$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 ($cache==0) {
+ // nocache
+ header('Cache-Control: must-revalidate, no-transform, post-check=0, pre-check=0');
+ header('Pragma: public');
+ }
+ header('Accept-Ranges: bytes');
+ //send important headers first, script stops here if '304 Not Modified' response
+ http_conditionalRequest($fmtime);
+ list($start,$len) = http_rangeRequest(filesize($file));
+
+ //application mime type is downloadable
+ if(substr($mime,0,11) == 'application'){
+ header('Content-Disposition: attachment; filename="'.basename($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) && $chunk > 0) {
+ @set_time_limit(); // large files can take a lot of time
+ print fread($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,$tot);
+}
+
+/**
+ * Resizes the given image to the given size
+ *
+ * @author Andreas Gohr <andi@splitbrain.org>
+ */
+function get_resized($file, $ext, $w, $h=0){
+ global $conf;
+
+ $info = getimagesize($file);
+ if(!$h) $h = round(($w * $info[1]) / $info[0]);
+
+ // we wont scale up to infinity
+ if($w > 2000 || $h > 2000) return $file;
+
+ //cache
+ $local = getCacheName($file,'.media.'.$w.'x'.$h.'.'.$ext);
+ $mtime = @filemtime($local); // 0 if not exists
+
+ if( $mtime > filemtime($file) ||
+ resize_imageIM($ext,$file,$info[0],$info[1],$local,$w,$h) ||
+ resize_imageGD($ext,$file,$info[0],$info[1],$local,$w,$h) ){
+ return $local;
+ }
+ //still here? resizing failed
+ return $file;
+}
+
+/**
+ * Returns the wanted cachetime in seconds
+ *
+ * Resolves named constants
+ *
+ * @author Andreas Gohr <andi@splitbrain.org>
+ */
+function calc_cache($cache){
+ global $conf;
+
+ if(strtolower($cache) == 'nocache') return 0; //never cache
+ if(strtolower($cache) == 'recache') return $conf['cachetime']; //use standard cache
+ return -1; //cache endless
+}
+
+/**
+ * Download a remote file and return local filename
+ *
+ * returns false if download fails. Uses cached file if available and
+ * wanted
+ *
+ * @author Andreas Gohr <andi@splitbrain.org>
+ * @author Pavel Vitis <Pavel.Vitis@seznam.cz>
+ */
+function get_from_URL($url,$ext,$cache){
+ global $conf;
+
+ // if no cache or fetchsize just redirect
+ if ($cache==0) return false;
+ if (!$conf['fetchsize']) return false;
+
+ $local = getCacheName(strtolower($url),".media.$ext");
+ $mtime = @filemtime($local); // 0 if not exists
+
+ //decide if download needed:
+ if( ($mtime == 0) || // cache does not exist
+ ($cache != -1 && $mtime < time()-$cache) // 'recache' and cache has expired
+ ){
+ if(image_download($url,$local)){
+ return $local;
+ }else{
+ return false;
+ }
+ }
+
+ //if cache exists use it else
+ if($mtime) return $local;
+
+ //else return false
+ return false;
+}
+
+/**
+ * Download image files
+ *
+ * @author Andreas Gohr <andi@splitbrain.org>
+ */
+function image_download($url,$file){
+ global $conf;
+ $http = new DokuHTTPClient();
+ $http->max_bodysize = $conf['fetchsize'];
+ $http->timeout = 25; //max. 25 sec
+ $http->header_regexp = '!\r\nContent-Type: image/(jpe?g|gif|png)!i';
+
+ $data = $http->get($url);
+ if(!$data) return false;
+
+ $fileexists = @file_exists($file);
+ $fp = @fopen($file,"w");
+ if(!$fp) return false;
+ fwrite($fp,$data);
+ fclose($fp);
+ if(!$fileexists and $conf['fperm']) chmod($file, $conf['fperm']);
+
+ // check if it is really an image
+ $info = @getimagesize($file);
+ if(!$info){
+ @unlink($file);
+ return false;
+ }
+
+ return true;
+}
+
+/**
+ * resize images using external ImageMagick convert program
+ *
+ * @author Pavel Vitis <Pavel.Vitis@seznam.cz>
+ * @author Andreas Gohr <andi@splitbrain.org>
+ */
+function resize_imageIM($ext,$from,$from_w,$from_h,$to,$to_w,$to_h){
+ global $conf;
+
+ // check if convert is configured
+ if(!$conf['im_convert']) return false;
+
+ // prepare command
+ $cmd = $conf['im_convert'];
+ $cmd .= ' -resize '.$to_w.'x'.$to_h.'!';
+ if ($ext == 'jpg' || $ext == 'jpeg') {
+ $cmd .= ' -quality '.$conf['jpg_quality'];
+ }
+ $cmd .= " $from $to";
+
+ @exec($cmd,$out,$retval);
+ if ($retval == 0) return true;
+ return false;
+}
+
+/**
+ * resize images using PHP's libGD support
+ *
+ * @author Andreas Gohr <andi@splitbrain.org>
+ */
+function resize_imageGD($ext,$from,$from_w,$from_h,$to,$to_w,$to_h){
+ global $conf;
+
+ if($conf['gdlib'] < 1) return false; //no GDlib available or wanted
+
+ // check available memory
+ if(!is_mem_available(($from_w * $from_h * 4) + ($to_w * $to_h * 4))){
+ return false;
+ }
+
+ // create an image of the given filetype
+ if ($ext == 'jpg' || $ext == 'jpeg'){
+ if(!function_exists("imagecreatefromjpeg")) return false;
+ $image = @imagecreatefromjpeg($from);
+ }elseif($ext == 'png') {
+ if(!function_exists("imagecreatefrompng")) return false;
+ $image = @imagecreatefrompng($from);
+
+ }elseif($ext == 'gif') {
+ if(!function_exists("imagecreatefromgif")) return false;
+ $image = @imagecreatefromgif($from);
+ }
+ if(!$image) return false;
+
+ if(($conf['gdlib']>1) && function_exists("imagecreatetruecolor")){
+ $newimg = @imagecreatetruecolor ($to_w, $to_h);
+ }
+ if(!$newimg) $newimg = @imagecreate($to_w, $to_h);
+ if(!$newimg){
+ imagedestroy($image);
+ return false;
+ }
+
+ //keep png alpha channel if possible
+ if($ext == 'png' && $conf['gdlib']>1 && function_exists('imagesavealpha')){
+ imagealphablending($newimg, false);
+ imagesavealpha($newimg,true);
+ }
+
+ //try resampling first
+ if(function_exists("imagecopyresampled")){
+ if(!@imagecopyresampled($newimg, $image, 0, 0, 0, 0, $to_w, $to_h, $from_w, $from_h)) {
+ imagecopyresized($newimg, $image, 0, 0, 0, 0, $to_w, $to_h, $from_w, $from_h);
+ }
+ }else{
+ imagecopyresized($newimg, $image, 0, 0, 0, 0, $to_w, $to_h, $from_w, $from_h);
+ }
+
+ $okay = false;
+ if ($ext == 'jpg' || $ext == 'jpeg'){
+ if(!function_exists('imagejpeg')){
+ $okay = false;
+ }else{
+ $okay = imagejpeg($newimg, $to, $conf['jpg_quality']);
+ }
+ }elseif($ext == 'png') {
+ if(!function_exists('imagepng')){
+ $okay = false;
+ }else{
+ $okay = imagepng($newimg, $to);
+ }
+ }elseif($ext == 'gif') {
+ if(!function_exists('imagegif')){
+ $okay = false;
+ }else{
+ $okay = imagegif($newimg, $to);
+ }
+ }
+
+ // destroy GD image ressources
+ if($image) imagedestroy($image);
+ if($newimg) imagedestroy($newimg);
+
+ return $okay;
+}
+
+/**
+ * Checks if the given amount of memory is available
+ *
+ * If the memory_get_usage() function is not available the
+ * function just assumes $used bytes of already allocated memory
+ *
+ * @param int $mem Size of memory you want to allocate in bytes
+ * @param int $used already allocated memory (see above)
+ * @author Filip Oscadal <webmaster@illusionsoftworks.cz>
+ * @author Andreas Gohr <andi@splitbrain.org>
+ */
+function is_mem_available($mem,$bytes=1048576){
+ $limit = trim(ini_get('memory_limit'));
+ if(empty($limit)) return true; // no limit set!
+
+ // parse limit to bytes
+ $unit = strtolower(substr($limit,-1));
+ switch($unit){
+ case 'g':
+ $limit = substr($limit,0,-1);
+ $limit *= 1024*1024*1024;
+ break;
+ case 'm':
+ $limit = substr($limit,0,-1);
+ $limit *= 1024*1024;
+ break;
+ case 'k':
+ $limit = substr($limit,0,-1);
+ $limit *= 1024;
+ break;
+ }
+
+ // get used memory if possible
+ if(function_exists('memory_get_usage')){
+ $used = memory_get_usage();
+ }
+
+
+ if($used+$mem > $limit){
+ return false;
+ }
+
+ return true;
+}
+
+//Setup VIM: ex: et ts=2 enc=utf-8 :
+?>
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-26 15:07:06 +0000