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