xref: /dokuwiki/lib/exe/fetch.php (revision 58b6f612a14a40fc14fffa363d6f272b36cd9f30) 
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  = getID('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($FILE));
79  header('Cache-Control: private, must-revalidate, post-check=0, pre-check=0');
80
81  //application mime type is downloadable
82  if(substr($MIME,0,11) == 'application'){
83    header('Content-Disposition: attachment; filename="'.basename($FILE).'"');
84  }
85
86  $fp = @fopen($FILE,"rb");
87  if($fp){
88    while (!feof($fp)) {
89      @set_time_limit(); // large files can take a lot of time
90      print fread($fp, 16*1024);
91      flush();
92    }
93    fclose($fp);
94  }else{
95    header("HTTP/1.0 500 Internal Server Error");
96    print "Could not read $FILE - bad permissions?";
97  }
98
99/* ------------------------------------------------------------------------ */
100
101/**
102 * Resizes the given image to the given size
103 *
104 * @author  Andreas Gohr <andi@splitbrain.org>
105 */
106function get_resized($file, $ext, $w, $h=0){
107  global $conf;
108
109  $info  = getimagesize($file);
110  if(!$h) $h = round(($w * $info[1]) / $info[0]);
111
112
113  //cache
114  $local = getCacheName($file,'.media.'.$w.'x'.$h.'.'.$ext);
115  $mtime = @filemtime($local); // 0 if not exists
116
117  if( $mtime > filemtime($file) || resize_image($ext,$file,$info[0],$info[1],$local,$w,$h) ){
118    return $local;
119  }
120  //still here? resizing failed
121  return $file;
122}
123
124/**
125 * Returns the wanted cachetime in seconds
126 *
127 * Resolves named constants
128 *
129 * @author  Andreas Gohr <andi@splitbrain.org>
130 */
131function calc_cache($cache){
132  global $conf;
133
134  if(strtolower($cache) == 'nocache') return 0; //never cache
135  if(strtolower($cache) == 'recache') return $conf['cachetime']; //use standard cache
136  return -1; //cache endless
137}
138
139/**
140 * Download a remote file and return local filename
141 *
142 * returns false if download fails. Uses cached file if available and
143 * wanted
144 *
145 * @author  Andreas Gohr <andi@splitbrain.org>
146 */
147function get_from_URL($url,$ext,$cache){
148  global $conf;
149
150  $url = strtolower($url);
151  $local = getCacheName($url,".media.$ext");
152  $mtime = @filemtime($local); // 0 if not exists
153
154  //decide if download needed:
155
156  //  never cache     exists but no endless cache     not exists or expired
157  if( $cache == 0 || ($mtime != 0 && $cache != -1) || $mtime < time()-$cache ){
158    if(io_download($url,$local)){
159      return $local;
160    }else{
161      return false;
162    }
163  }
164
165  //if cache exists use it else
166  if($mtime) return $local;
167
168  //else return false
169  return false;
170}
171
172/**
173 * resize images
174 *
175 * @author Andreas Gohr <andi@splitbrain.org>
176 */
177function resize_image($ext,$from,$from_w,$from_h,$to,$to_w,$to_h){
178  global $conf;
179
180  if($conf['gdlib'] < 1) return false; //no GDlib available or wanted
181
182  // create an image of the given filetype
183  if ($ext == 'jpg' || $ext == 'jpeg'){
184    if(!function_exists("imagecreatefromjpeg")) return false;
185    $image = @imagecreatefromjpeg($from);
186  }elseif($ext == 'png') {
187    if(!function_exists("imagecreatefrompng")) return false;
188    $image = @imagecreatefrompng($from);
189
190  }elseif($ext == 'gif') {
191    if(!function_exists("imagecreatefromgif")) return false;
192    $image = @imagecreatefromgif($from);
193  }
194  if(!$image) return false;
195
196  if(($conf['gdlib']>1) && function_exists("imagecreatetruecolor")){
197    $newimg = @imagecreatetruecolor ($to_w, $to_h);
198  }
199  if(!$newimg) $newimg = @imagecreate($to_w, $to_h);
200  if(!$newimg) return false;
201
202  //keep png alpha channel if possible
203  if($ext == 'png' && $conf['gdlib']>1 && function_exists('imagesavealpha')){
204    imagealphablending($newimg, false);
205    imagesavealpha($newimg,true);
206  }
207
208  // create cachedir
209  //io_makeFileDir($to); // not needed anymore, should exist
210
211  //try resampling first
212  if(function_exists("imagecopyresampled")){
213    if(!@imagecopyresampled($newimg, $image, 0, 0, 0, 0, $to_w, $to_h, $from_w, $from_h)) {
214      imagecopyresized($newimg, $image, 0, 0, 0, 0, $to_w, $to_h, $from_w, $from_h);
215    }
216  }else{
217    imagecopyresized($newimg, $image, 0, 0, 0, 0, $to_w, $to_h, $from_w, $from_h);
218  }
219
220  if ($ext == 'jpg' || $ext == 'jpeg'){
221    if(!function_exists("imagejpeg")) return false;
222    return imagejpeg($newimg, $to, 70);
223  }elseif($ext == 'png') {
224    if(!function_exists("imagepng")) return false;
225    return imagepng($newimg, $to);
226  }elseif($ext == 'gif') {
227    if(!function_exists("imagegif")) return false;
228    return imagegif($newimg, $to);
229  }
230
231  return false;
232}
233
234
235//Setup VIM: ex: et ts=2 enc=utf-8 :
236?>
237