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-rw-r--r--lib/exe/fetch.php230
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diff --git a/lib/exe/fetch.php b/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>
+ */
+
+ 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/pageutils.php');
+ require_once(DOKU_INC.'inc/confutils.php');
+ require_once(DOKU_INC.'inc/auth.php');
+ $mimetypes = getMimeTypes();
+
+ //get input
+ $MEDIA = $_REQUEST['media'];
+ $CACHE = calc_cache($_REQUEST['cache']);
+ $WIDTH = $_REQUEST['w'];
+ $HEIGHT = $_REQUEST['h'];
+ list($EXT,$MIME) = mimetype($MEDIA);
+ if($EXT === false){
+ $EXT = 'unknown';
+ $MIME = 'application/octet-stream';
+ }
+
+ //media to local file
+ if(preg_match('#^(https?|ftp)://#i',$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
+ print 'Unauthorized';
+ exit;
+ }
+ $FILE = mediaFN($MEDIA);
+ }
+
+ //check file existance
+ if(!@file_exists($FILE)){
+ header("HTTP/1.0 404 Not Found");
+ //FIXME add some default broken image
+ print 'Not Found';
+ exit;
+ }
+
+ //handle image resizing
+ if((substr($MIME,0,5) == 'image') && $WIDTH){
+ $FILE = get_resized($FILE,$EXT,$WIDTH,$HEIGHT);
+ }
+
+
+ //FIXME set sane cachecontrol headers
+ //FIXME handle conditional and partial requests
+
+ //send file
+ header("Content-Type: $MIME");
+ header('Last-Modified: '.date('r',filemtime($FILE)));
+ header('Content-Length: '.filesize($FILE));
+
+ //application mime type is downloadable
+ if(substr($MIME,0,11) == 'application'){
+ header('Content-Disposition: attachment; filename="'.basename($FILE).'"');
+ }
+
+ $fp = @fopen($FILE,"rb");
+ if($fp){
+ fpassthru($fp); //does a close itself
+ }else{
+ header("HTTP/1.0 500 Internal Server Error");
+ print "Could not read $FILE - bad permissions?";
+ }
+
+/* ------------------------------------------------------------------------ */
+
+/**
+ * Resizes the given image to the given size
+ *
+ * @author Andreas Gohr <andi@splitbrain.org>
+ */
+function get_resized($file, $ext, $w, $h=0){
+ global $conf;
+
+ $md5 = md5($file);
+ $info = getimagesize($file);
+ if(!$h) $h = round(($w * $info[1]) / $info[0]);
+
+
+ //cache
+ $local = $conf['mediadir'].'/_cache/'.$md5.'.'.$w.'x'.$h.'.'.$ext;
+ $mtime = @filemtime($local); // 0 if not exists
+
+ if( $mtime > filemtime($file) || resize_image($ext,$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 $conf['cachetime']; //use standard cache
+ return -1; //cache endless
+}
+
+/**
+ * Download a remote file and return local filename
+ *
+ * returns false if download fails. Uses cached file if available and
+ * wanted
+ *
+ * @author Andreas Gohr <andi@splitbrain.org>
+ */
+function get_from_URL($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(io_download($url,$local)){
+ return $local;
+ }else{
+ return false;
+ }
+ }
+
+ //if cache exists use it else
+ if($mtime) return $local;
+
+ //else return false
+ return false;
+}
+
+/**
+ * resize images
+ *
+ * @author Andreas Gohr <andi@splitbrain.org>
+ */
+function resize_image($ext,$from,$from_w,$from_h,$to,$to_w,$to_h){
+ global $conf;
+
+ if($conf['gdlib'] < 1) return false; //no GDlib available or wanted
+
+ // 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) return false;
+
+ //keep png alpha channel if possible
+ if($ext == 'png' && $conf['gdlib']>1 && function_exists('imagesavealpha')){
+ imagealphablending($newimg, false);
+ imagesavealpha($newimg,true);
+ }
+
+ // create cachedir
+ io_makeFileDir($to);
+
+ //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, $from_h);
+ }
+
+ if ($ext == 'jpg' || $ext == 'jpeg'){
+ if(!function_exists("imagejpeg")) return false;
+ return imagejpeg($newimg, $to, 70);
+ }elseif($ext == 'png') {
+ if(!function_exists("imagepng")) return false;
+ return imagepng($newimg, $to);
+ }elseif($ext == 'gif') {
+ if(!function_exists("imagegif")) return false;
+ return imagegif($newimg, $to);
+ }
+
+ return false;
+}
+
+
+//Setup VIM: ex: et ts=2 enc=utf-8 :
+?>
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