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| -rw-r--r-- | plugins/dokuwiki/lib/exe/fetch.php | 433 |
diff --git a/plugins/dokuwiki/lib/exe/fetch.php b/plugins/dokuwiki/lib/exe/fetch.php new file mode 100644 index 0000000..59e59ca --- /dev/null +++ b/plugins/dokuwiki/lib/exe/fetch.php @@ -0,0 +1,433 @@ +<?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 : +?> |