<?php
/*
Plugin Name: Upload/download frontend
Plugin URI: http://enano.homelinux.org/
Description: Provides the pages Special:UploadFile and Special:DownloadFile. UploadFile is used to upload files to the site, and DownloadFile fetches the file from the database, creates thumbnails if necessary, and sends the file to the user.
Author: Dan Fuhry
Version: 1.0
Author URI: http://enano.homelinux.org/
*/
/*
* Enano - an open-source CMS capable of wiki functions, Drupal-like sidebar blocks, and everything in between
* Version 1.0 release candidate 2
* Copyright (C) 2006-2007 Dan Fuhry
* SpecialUpdownload.php - handles uploading and downloading of user-uploaded files - possibly the most rigorously security-enforcing script in all of Enano, although sessions.php comes in a close second
*
* This program is Free Software; you can redistribute and/or modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for details.
*/
global $db, $session, $paths, $template, $plugins; // Common objects
$plugins->attachHook('base_classes_initted', '
global $paths;
$paths->add_page(Array(
\'name\'=>\'Upload file\',
\'urlname\'=>\'UploadFile\',
\'namespace\'=>\'Special\',
\'special\'=>0,\'visible\'=>1,\'comments_on\'=>0,\'protected\'=>1,\'delvotes\'=>0,\'delvote_ips\'=>\'\',
));
$paths->add_page(Array(
\'name\'=>\'Download file\',
\'urlname\'=>\'DownloadFile\',
\'namespace\'=>\'Special\',
\'special\'=>0,\'visible\'=>0,\'comments_on\'=>0,\'protected\'=>1,\'delvotes\'=>0,\'delvote_ips\'=>\'\',
));
');
function page_Special_UploadFile()
{
global $db, $session, $paths, $template, $plugins; // Common objects
global $mime_types;
if(getConfig('enable_uploads')!='1') { die_friendly('Access denied', '<p>File uploads are disabled this website.</p>'); }
if ( !$session->get_permissions('upload_files') )
{
die_friendly('Access denied', '<p>File uploads are disabled for your user account or group.<p>');
}
if(isset($_POST['doit']))
{
if(isset($_FILES['data']))
{
$file =& $_FILES['data'];
}
else
{
$file = false;
}
if(!is_array($file)) die_friendly('Upload failed', '<p>The server could not retrieve the array $_FILES[\'data\'].</p>');
if($file['size'] == 0 || $file['size'] > (int)getConfig('max_file_size')) die_friendly('Upload failed', '<p>The file you uploaded is either too large or 0 bytes in length.</p>');
/*
$allowed_mime_types = Array(
'text/plain',
'image/png',
'image/jpeg',
'image/tiff',
'image/gif',
'text/html', // Safe because the file is stashed in the database
'application/x-bzip2',
'application/x-gzip',
'text/x-c++'
);
if(function_exists('finfo_open') && $fi = finfo_open(FILEINFO_MIME, ENANO_ROOT.'/includes/magic')) // First try to use the fileinfo extension, this is the best way to determine the mimetype
{
if(!$fi) die_friendly('Upload failed', '<p>Enano was unable to determine the format of the uploaded file.</p><p>'.@finfo_file($fi, $file['tmp_name']).'</p>');
$type = @finfo_file($fi, $file['tmp_name']);
@finfo_close($fi);
}
elseif(function_exists('mime_content_type'))
$type = mime_content_type($file['tmp_name']); // OK, no fileinfo function. Use a (usually) built-in PHP function
elseif(isset($file['type']))
$type = $file['type']; // LAST RESORT: use the mimetype the browser sent us, though this is likely to be spoofed
else // DANG! Not even the browser told us. Bail out.
die_friendly('Upload failed', '<p>Enano was unable to determine the format of the uploaded file.</p>');
*/
$types = fetch_allowed_extensions();
$ext = substr($file['name'], strrpos($file['name'], '.')+1, strlen($file['name']));
if(!isset($types[$ext]) || ( isset($types[$ext]) && !$types[$ext] ) )
{
die_friendly('Upload failed', '<p>The file type ".'.$ext.'" is not allowed.</p>');
}
$type = $mime_types[$ext];
//$type = explode(';', $type); $type = $type[0];
//if(!in_array($type, $allowed_mime_types)) die_friendly('Upload failed', '<p>The file type "'.$type.'" is not allowed.</p>');
if($_POST['rename'] != '')
{
$filename = $_POST['rename'];
}
else
{
$filename = $file['name'];
}
$bad_chars = Array(':', '\\', '/', '<', '>', '|', '*', '?', '"', '#', '+');
foreach($bad_chars as $ch)
{
if(strstr($filename, $ch) || preg_match('/^([ ]+)$/is', $filename)) die_friendly('Upload failed', '<p>The filename contains invalid characters.</p>');
}
if ( isset ( $paths->pages[ $paths->nslist['File'] . $filename ] ) && !isset ( $_POST['update'] ) )
{
die_friendly('Upload failed', '<p>The file already exists. You can <a href="'.makeUrlNS('Special', 'UploadFile/'.$filename).'">upload a new version of this file</a>.</p>');
}
else if ( isset($_POST['update']) &&
( !isset($paths->pages[$paths->nslist['File'].$filename]) ||
(isset($paths->pages[$paths->nslist['File'].$filename]) &&
$paths->pages[$paths->nslist['File'].$filename]['protected'] == 1 )
)
)
{
die_friendly('Upload failed', '<p>Either the file does not exist (and therefore cannot be updated) or the file is protected.</p>');
}
$utime = time();
$filename = $db->escape($filename);
$ext = substr($filename, strrpos($filename, '.'), strlen($filename));
$flen = filesize($file['tmp_name']);
$comments = $db->escape(RenderMan::strip_php($_POST['comments']));
$chartag = sha1(microtime());
$urln = str_replace(' ', '_', $filename);
$key = md5($filename . '_' . file_get_contents($file['tmp_name']));
$targetname = ENANO_ROOT . '/files/' . $key . '_' . $utime . $ext;
if(!@move_uploaded_file($file['tmp_name'], $targetname))
{
die_friendly('Upload failed', '<p>Could not move uploaded file to the new location.</p>');
}
if(getConfig('file_history') != '1')
{
if(!$db->sql_query('DELETE FROM '.table_prefix.'files WHERE filename=\''.$filename.'\' LIMIT 1;')) $db->_die('The old file data could not be deleted.');
}
if(!$db->sql_query('INSERT INTO '.table_prefix.'files(time_id,page_id,filename,size,mimetype,file_extension,file_key) VALUES('.$utime.', \''.$urln.'\', \''.$filename.'\', '.$flen.', \''.$type.'\', \''.$ext.'\', \''.$key.'\')')) $db->_die('The file data entry could not be inserted.');
if(!isset($_POST['update']))
{
if(!$db->sql_query('INSERT INTO '.table_prefix.'logs(time_id,date_string,log_type,action,author,page_id,namespace) VALUES('.$utime.', \''.date('d M Y h:i a').'\', \'page\', \'create\', \''.$session->username.'\', \''.$filename.'\', \''.'File'.'\');')) $db->_die('The page log could not be updated.');
if(!$db->sql_query('INSERT INTO '.table_prefix.'pages(name,urlname,namespace,protected,delvotes,delvote_ips) VALUES(\''.$filename.'\', \''.$urln.'\', \'File\', 0, 0, \'\')')) $db->_die('The page listing entry could not be inserted.');
if(!$db->sql_query('INSERT INTO '.table_prefix.'page_text(page_id,namespace,page_text,char_tag) VALUES(\''.$urln.'\', \'File\', \''.$comments.'\', \''.$chartag.'\')')) $db->_die('The page text entry could not be inserted.');
}
else
{
if(!$db->sql_query('INSERT INTO '.table_prefix.'logs(time_id,date_string,log_type,action,author,page_id,namespace,edit_summary) VALUES('.$utime.', \''.date('d M Y h:i a').'\', \'page\', \'reupload\', \''.$session->username.'\', \''.$filename.'\', \''.'File'.'\', \''.$comments.'\');')) $db->_die('The page log could not be updated.');
}
die_friendly('Upload complete', '<p>Your file has been uploaded successfully. View the <a href="'.makeUrlNS('File', $filename).'">file\'s page</a>.</p>');
}
else
{
$template->header();
$fn = $paths->getParam(0);
if ( $fn && !$session->get_permissions('upload_new_version') )
{
die_friendly('Access denied', '<p>Uploading new versions of files has been disabled for your user account or group.<p>');
}
?>
<p>Using this form you can upload a file to the <?php echo getConfig('site_name'); ?> site.</p>
<p>The maximum file size is <?php
// Get the max file size, and format it in a way that is user-friendly
$fs = getConfig('max_file_size');
echo commatize($fs).' bytes';
$fs = (int)$fs;
if($fs >= 1048576)
{
$fs = round($fs / 1048576, 1);
echo ' ('.$fs.' MB)';
}
elseif($fs >= 1024)
{
$fs = round($fs / 1024, 1);
echo ' ('.$fs.' KB)';
}
?>.</p>
<form action="<?php echo makeUrl($paths->page); ?>" method="post" enctype="multipart/form-data">
<table border="0" cellspacing="1" cellpadding="4">
<tr><td>File:</td><td><input name="data" type="file" size="40" /></td></tr>
<tr><td>Rename to:</td><td><input name="rename" type="text" size="40"<?php if($fn) echo ' value="'.$fn.'" readonly="readonly"'; ?> /></td></tr>
<?php
if(!$fn) echo '<tr><td>Comments:<br />(can be wiki-formatted)</td><td><textarea name="comments" rows="20" cols="60"></textarea></td></tr>';
else echo '<tr><td>Reason for uploading the new version: </td><td><input name="comments" size="50" /></td></tr>';
?>
<tr><td colspan="2" style="text-align: center">
<?php
if($fn)
echo '<input type="hidden" name="update" value="true" />';
?>
<input type="submit" name="doit" value="Upload file" />
</td></tr>
</table>
</form>
<?php
$template->footer();
}
}
function page_Special_DownloadFile()
{
global $db, $session, $paths, $template, $plugins; // Common objects
global $do_gzip;
$filename = rawurldecode($paths->getParam(0));
$timeid = $paths->getParam(1);
if($timeid && preg_match('#^([0-9]+)$#', (string)$timeid)) $tid = ' AND time_id='.$timeid;
else $tid = '';
$filename = $db->escape($filename);
$q = $db->sql_query('SELECT page_id,size,mimetype,time_id,file_extension,file_key FROM '.table_prefix.'files WHERE filename=\''.$filename.'\''.$tid.' ORDER BY time_id DESC;');
if(!$q) $db->_die('The file data could not be selected.');
if($db->numrows() < 1) { header('HTTP/1.1 404 Not Found'); die_friendly('File not found', '<p>The file "'.$filename.'" cannot be found.</p>'); }
$row = $db->fetchrow();
$db->free_result();
// Check permissions
$perms = $session->fetch_page_acl($row['page_id'], 'File');
if ( !$perms->get_permissions('read') )
{
die_friendly('Access denied', '<p>Access to the specified file is denied.</p>');
}
$fname = ENANO_ROOT . '/files/' . $row['file_key'] . '_' . $row['time_id'] . $row['file_extension'];
$data = file_get_contents($fname);
if(isset($_GET['preview']) && getConfig('enable_imagemagick')=='1' && file_exists(getConfig('imagemagick_path')) && substr($row['mimetype'], 0, 6) == 'image/')
{
$nam = tempnam('/tmp', $filename);
$h = @fopen($nam, 'w');
if(!$h) die('Error opening '.$nam.' for writing');
fwrite($h, $data);
fclose($h);
/* Make sure the request doesn't contain commandline injection - yow! */
if(!isset($_GET['width' ]) || (isset($_GET['width'] ) && !preg_match('#^([0-9]+)$#', $_GET['width'] ))) $width = '320'; else $width = $_GET['width' ];
if(!isset($_GET['height']) || (isset($_GET['height']) && !preg_match('#^([0-9]+)$#', $_GET['height'] ))) $height = '240'; else $height = $_GET['height'];
$cache_filename=ENANO_ROOT.'/cache/'.$filename.'-'.$row['time_id'].'-'.$width.'x'.$height.$row['file_extension'];
if(getConfig('cache_thumbs')=='1' && file_exists($cache_filename) && is_writable(ENANO_ROOT.'/cache')) {
$data = file_get_contents($cache_filename);
} elseif(getConfig('enable_imagemagick')=='1' && file_exists(getConfig('imagemagick_path'))) {
// Use ImageMagick to convert the image
//unlink($nam);
error_reporting(E_ALL);
$cmd = ''.getConfig('imagemagick_path').' "'.$nam.'" -resize "'.$width.'x'.$height.'>" "'.$nam.'.scaled'.$row['file_extension'].'"';
system($cmd, $stat);
if(!file_exists($nam.'.scaled'.$row['file_extension'])) die('Failed to call ImageMagick (return value '.$stat.'), command line was:<br />'.$cmd);
$data = file_get_contents($nam.'.scaled'.$row['file_extension']);
// Be stingy about it - better to re-generate the image hundreds of times than to fail completely
if(getConfig('cache_thumbs')=='1' && !file_exists($cache_filename)) {
// Write the generated thumbnail to the cache directory
$h = @fopen($cache_filename, 'w');
if(!$h) die('Error opening cache file "'.$cache_filename.'" for writing.');
fwrite($h, $data);
fclose($h);
}
}
unlink($nam);
}
$len = strlen($data);
header('Content-type: '.$row['mimetype']);
if(isset($_GET['download'])) header('Content-disposition: attachment, filename="'.$filename.'";');
header('Content-length: '.$len);
header('Last-Modified: '.date('r', $row['time_id']));
echo($data);
//
// Compress buffered output if required and send to browser
//
if ( $do_gzip )
{
//
// Copied from phpBB, which was in turn borrowed from php.net
//
$gzip_contents = ob_get_contents();
ob_end_clean();
$gzip_size = strlen($gzip_contents);
$gzip_crc = crc32($gzip_contents);
$gzip_contents = gzcompress($gzip_contents, 9);
$gzip_contents = substr($gzip_contents, 0, strlen($gzip_contents) - 4);
header('Content-encoding: gzip');
echo "\x1f\x8b\x08\x00\x00\x00\x00\x00";
echo $gzip_contents;
echo pack('V', $gzip_crc);
echo pack('V', $gzip_size);
}
exit;
}
?>