1<?php 2/** 3 * DokuWiki media passthrough file 4 * 5 * @license GPL 2 (http://www.gnu.org/licenses/gpl.html) 6 * @author Andreas Gohr <andi@splitbrain.org> 7 */ 8 9 if(!defined('DOKU_INC')) define('DOKU_INC',realpath(dirname(__FILE__).'/../../').'/'); 10 require_once(DOKU_INC.'inc/init.php'); 11 require_once(DOKU_INC.'inc/common.php'); 12 require_once(DOKU_INC.'inc/pageutils.php'); 13 require_once(DOKU_INC.'inc/confutils.php'); 14 require_once(DOKU_INC.'inc/auth.php'); 15 //close sesseion 16 session_write_close(); 17 18 $mimetypes = getMimeTypes(); 19 20 //get input 21 $MEDIA = $_REQUEST['media']; 22 $CACHE = calc_cache($_REQUEST['cache']); 23 $WIDTH = $_REQUEST['w']; 24 $HEIGHT = $_REQUEST['h']; 25 list($EXT,$MIME) = mimetype($MEDIA); 26 if($EXT === false){ 27 $EXT = 'unknown'; 28 $MIME = 'application/octet-stream'; 29 } 30 31 //media to local file 32 if(preg_match('#^(https?|ftp)://#i',$MEDIA)){ 33 //handle external media 34 $FILE = get_from_URL($MEDIA,$EXT,$CACHE); 35 if(!$FILE){ 36 //download failed - redirect to original URL 37 header('Location: '.$MEDIA); 38 exit; 39 } 40 }else{ 41 $MEDIA = cleanID($MEDIA); 42 if(empty($MEDIA)){ 43 header("HTTP/1.0 400 Bad Request"); 44 print 'Bad request'; 45 exit; 46 } 47 48 //check permissions (namespace only) 49 if(auth_quickaclcheck(getNS($MEDIA).':X') < AUTH_READ){ 50 header("HTTP/1.0 401 Unauthorized"); 51 //fixme add some image for imagefiles 52 print 'Unauthorized'; 53 exit; 54 } 55 $FILE = mediaFN($MEDIA); 56 } 57 58 //check file existance 59 if(!@file_exists($FILE)){ 60 header("HTTP/1.0 404 Not Found"); 61 //FIXME add some default broken image 62 print 'Not Found'; 63 exit; 64 } 65 66 //handle image resizing 67 if((substr($MIME,0,5) == 'image') && $WIDTH){ 68 $FILE = get_resized($FILE,$EXT,$WIDTH,$HEIGHT); 69 } 70 71 72 //FIXME set sane cachecontrol headers 73 //FIXME handle conditional and partial requests 74 75 //send file 76 header("Content-Type: $MIME"); 77 header('Last-Modified: '.date('r',filemtime($FILE))); 78 header('Content-Length: '.filesize($FILE)); 79 header('Cache-Control: must-revalidate, post-check=0, pre-check=0'); 80 81 //application mime type is downloadable 82 if(substr($MIME,0,11) == 'application'){ 83 header('Content-Disposition: attachment; filename="'.basename($FILE).'"'); 84 } 85 86 $fp = @fopen($FILE,"rb"); 87 if($fp){ 88 fpassthru($fp); //does a close itself 89 }else{ 90 header("HTTP/1.0 500 Internal Server Error"); 91 print "Could not read $FILE - bad permissions?"; 92 } 93 94/* ------------------------------------------------------------------------ */ 95 96/** 97 * Resizes the given image to the given size 98 * 99 * @author Andreas Gohr <andi@splitbrain.org> 100 */ 101function get_resized($file, $ext, $w, $h=0){ 102 global $conf; 103 104 $md5 = md5($file); 105 $info = getimagesize($file); 106 if(!$h) $h = round(($w * $info[1]) / $info[0]); 107 108 109 //cache 110 $local = $conf['mediadir'].'/_cache/'.$md5.'.'.$w.'x'.$h.'.'.$ext; 111 $mtime = @filemtime($local); // 0 if not exists 112 113 if( $mtime > filemtime($file) || resize_image($ext,$file,$info[0],$info[1],$local,$w,$h) ){ 114 return $local; 115 } 116 //still here? resizing failed 117 return $file; 118} 119 120/** 121 * Returns the wanted cachetime in seconds 122 * 123 * Resolves named constants 124 * 125 * @author Andreas Gohr <andi@splitbrain.org> 126 */ 127function calc_cache($cache){ 128 global $conf; 129 130 if(strtolower($cache) == 'nocache') return 0; //never cache 131 if(strtolower($cache) == 'recache') return $conf['cachetime']; //use standard cache 132 return -1; //cache endless 133} 134 135/** 136 * Download a remote file and return local filename 137 * 138 * returns false if download fails. Uses cached file if available and 139 * wanted 140 * 141 * @author Andreas Gohr <andi@splitbrain.org> 142 */ 143function get_from_URL($url,$ext,$cache){ 144 global $conf; 145 146 $url = strtolower($url); 147 $md5 = md5($url); 148 149 $local = $conf['mediadir']."/_cache/$md5.$ext"; 150 $mtime = @filemtime($local); // 0 if not exists 151 152 //decide if download needed: 153 154 // never cache exists but no endless cache not exists or expired 155 if( $cache == 0 || ($mtime != 0 && $cache != -1) || $mtime < time()-$cache ){ 156 if(io_download($url,$local)){ 157 return $local; 158 }else{ 159 return false; 160 } 161 } 162 163 //if cache exists use it else 164 if($mtime) return $local; 165 166 //else return false 167 return false; 168} 169 170/** 171 * resize images 172 * 173 * @author Andreas Gohr <andi@splitbrain.org> 174 */ 175function resize_image($ext,$from,$from_w,$from_h,$to,$to_w,$to_h){ 176 global $conf; 177 178 if($conf['gdlib'] < 1) return false; //no GDlib available or wanted 179 180 // create an image of the given filetype 181 if ($ext == 'jpg' || $ext == 'jpeg'){ 182 if(!function_exists("imagecreatefromjpeg")) return false; 183 $image = @imagecreatefromjpeg($from); 184 }elseif($ext == 'png') { 185 if(!function_exists("imagecreatefrompng")) return false; 186 $image = @imagecreatefrompng($from); 187 188 }elseif($ext == 'gif') { 189 if(!function_exists("imagecreatefromgif")) return false; 190 $image = @imagecreatefromgif($from); 191 } 192 if(!$image) return false; 193 194 if(($conf['gdlib']>1) && function_exists("imagecreatetruecolor")){ 195 $newimg = @imagecreatetruecolor ($to_w, $to_h); 196 } 197 if(!$newimg) $newimg = @imagecreate($to_w, $to_h); 198 if(!$newimg) return false; 199 200 //keep png alpha channel if possible 201 if($ext == 'png' && $conf['gdlib']>1 && function_exists('imagesavealpha')){ 202 imagealphablending($newimg, false); 203 imagesavealpha($newimg,true); 204 } 205 206 // create cachedir 207 io_makeFileDir($to); 208 209 //try resampling first 210 if(function_exists("imagecopyresampled")){ 211 if(!@imagecopyresampled($newimg, $image, 0, 0, 0, 0, $to_w, $to_h, $from_w, $from_h)) { 212 imagecopyresized($newimg, $image, 0, 0, 0, 0, $to_w, $to_h, $from_w, $from_h); 213 } 214 }else{ 215 imagecopyresized($newimg, $image, 0, 0, 0, 0, $to_w, $to_h, $from_w, $from_h); 216 } 217 218 if ($ext == 'jpg' || $ext == 'jpeg'){ 219 if(!function_exists("imagejpeg")) return false; 220 return imagejpeg($newimg, $to, 70); 221 }elseif($ext == 'png') { 222 if(!function_exists("imagepng")) return false; 223 return imagepng($newimg, $to); 224 }elseif($ext == 'gif') { 225 if(!function_exists("imagegif")) return false; 226 return imagegif($newimg, $to); 227 } 228 229 return false; 230} 231 232 233//Setup VIM: ex: et ts=2 enc=utf-8 : 234?> 235