plugins/SpecialUpdownload.php
author Dan
Sun, 02 Dec 2007 16:00:10 -0500
changeset 304 e2cb5f1432c8
parent 242 78a94f7bb5e3
parent 292 b3cfaf0a505c
child 326 ab66d6d1f1f4
permissions -rw-r--r--
Merging in the newly stable Coblynau
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<?php
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/*
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Plugin Name: Upload/download frontend
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Plugin URI: http://enanocms.org/
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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.
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Author: Dan Fuhry
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Version: 1.0.2
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Author URI: http://enanocms.org/
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*/
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/*
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 * Enano - an open-source CMS capable of wiki functions, Drupal-like sidebar blocks, and everything in between
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 * Version 1.0.2
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 * Copyright (C) 2006-2007 Dan Fuhry
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 * 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
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 *
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 * This program is Free Software; you can redistribute and/or modify it under the terms of the GNU General Public License
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 * as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
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 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for details.
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 */
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global $db, $session, $paths, $template, $plugins; // Common objects
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$plugins->attachHook('base_classes_initted', '
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  global $paths;
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    $paths->add_page(Array(
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      \'name\'=>\'Upload file\',
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      \'urlname\'=>\'UploadFile\',
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      \'namespace\'=>\'Special\',
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      \'special\'=>0,\'visible\'=>1,\'comments_on\'=>0,\'protected\'=>1,\'delvotes\'=>0,\'delvote_ips\'=>\'\',
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      ));
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    $paths->add_page(Array(
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      \'name\'=>\'Download file\',
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      \'urlname\'=>\'DownloadFile\',
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      \'namespace\'=>\'Special\',
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      \'special\'=>0,\'visible\'=>1,\'comments_on\'=>0,\'protected\'=>1,\'delvotes\'=>0,\'delvote_ips\'=>\'\',
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      ));
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    ');
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function page_Special_UploadFile()
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{
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  global $db, $session, $paths, $template, $plugins; // Common objects
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  global $mime_types;
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  if(getConfig('enable_uploads')!='1') { die_friendly('Access denied', '<p>File uploads are disabled this website.</p>'); }
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  if ( !$session->get_permissions('upload_files') )
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  {
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    die_friendly('Access denied', '<p>File uploads are disabled for your user account or group.<p>');
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  }
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  if(isset($_POST['doit']))
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  {
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    if(isset($_FILES['data']))
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    {
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      $file =& $_FILES['data'];
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    }
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    else
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    {
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      $file = false;
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    }
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    if ( !is_array($file) )
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    {
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      die_friendly('Upload failed', '<p>The server could not retrieve the array $_FILES[\'data\'].</p>');
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    }
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    if ( $file['size'] == 0 || $file['size'] > (int)getConfig('max_file_size') )
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    {
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      die_friendly('Upload failed', '<p>The file you uploaded is either too large or 0 bytes in length.</p>');
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    }
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    /*
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    $allowed_mime_types = Array(
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        'text/plain',
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        'image/png',
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        'image/jpeg',
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        'image/tiff',
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        'image/gif',
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        'text/html', // Safe because the file is stashed in the database
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        'application/x-bzip2',
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        'application/x-gzip',
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        'text/x-c++'
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      );
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    if(function_exists('finfo_open') && $fi = finfo_open(FILEINFO_MIME, ENANO_ROOT.'/includes/magic')) // First try to use the fileinfo extension, this is the best way to determine the mimetype
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    {
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      if(!$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>');
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      $type = @finfo_file($fi, $file['tmp_name']);
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      @finfo_close($fi);
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    }
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    elseif(function_exists('mime_content_type'))
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      $type = mime_content_type($file['tmp_name']); // OK, no fileinfo function. Use a (usually) built-in PHP function
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    elseif(isset($file['type']))
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      $type = $file['type']; // LAST RESORT: use the mimetype the browser sent us, though this is likely to be spoofed
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    else // DANG! Not even the browser told us. Bail out.
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      die_friendly('Upload failed', '<p>Enano was unable to determine the format of the uploaded file.</p>');
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    */
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    $types = fetch_allowed_extensions();
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    $ext = substr($file['name'], strrpos($file['name'], '.')+1, strlen($file['name']));
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    if ( !isset($types[$ext]) || ( isset($types[$ext]) && !$types[$ext] ) )
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    {
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      die_friendly('Upload failed', '<p>The file type ".'.$ext.'" is not allowed.</p>');
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    }
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    $type = $mime_types[$ext];
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    //$type = explode(';', $type); $type = $type[0];
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    //if(!in_array($type, $allowed_mime_types)) die_friendly('Upload failed', '<p>The file type "'.$type.'" is not allowed.</p>');
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    if($_POST['rename'] != '')
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    {
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      $filename = $_POST['rename'];
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    }
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    else
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    {
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      $filename = $file['name'];
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    }
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    $bad_chars = Array(':', '\\', '/', '<', '>', '|', '*', '?', '"', '#', '+');
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    foreach($bad_chars as $ch)
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    {
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      if(strstr($filename, $ch) || preg_match('/^([ ]+)$/is', $filename)) die_friendly('Upload failed', '<p>The filename contains invalid characters.</p>');
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    }
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    if ( isset ( $paths->pages[ $paths->nslist['File'] . $filename ] ) && !isset ( $_POST['update'] ) )
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    {
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      die_friendly('Upload failed', '<p>The file already exists. You can <a href="'.makeUrlNS('Special', 'UploadFile/'.$filename).'">upload a new version of this file</a>.</p>');
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    }
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    else if ( isset($_POST['update']) && 
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            ( !isset($paths->pages[$paths->nslist['File'].$filename]) ||
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             (isset($paths->pages[$paths->nslist['File'].$filename]) &&
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               $paths->pages[$paths->nslist['File'].$filename]['protected'] == 1 )
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             )
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           )
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    {
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      die_friendly('Upload failed', '<p>Either the file does not exist (and therefore cannot be updated) or the file is protected.</p>');
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    }
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    $utime = time();
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    $filename = $db->escape($filename);
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    $ext = substr($filename, strrpos($filename, '.'), strlen($filename));
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    $flen = filesize($file['tmp_name']);
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    $comments = ( isset($_POST['update']) ) ? $db->escape($_POST['comments']) : $db->escape(RenderMan::preprocess_text($_POST['comments'], false, false));
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    $chartag = sha1(microtime());
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    $urln = str_replace(' ', '_', $filename);
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    $key = md5($filename . '_' . file_get_contents($file['tmp_name']));
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    $targetname = ENANO_ROOT . '/files/' . $key . '_' . $utime . $ext;
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    if(!@move_uploaded_file($file['tmp_name'], $targetname))
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    {
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      die_friendly('Upload failed', '<p>Could not move uploaded file to the new location.</p>');
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    }
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    if(getConfig('file_history') != '1')
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    {
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      if(!$db->sql_query('DELETE FROM  '.table_prefix.'files WHERE filename=\''.$filename.'\' LIMIT 1;')) $db->_die('The old file data could not be deleted.');
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    }
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    if(!$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.'\')')) $db->_die('The file data entry could not be inserted.');
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    if(!isset($_POST['update']))
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    {
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      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'.'\');')) $db->_die('The page log could not be updated.');
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      if(!$db->sql_query('INSERT INTO '.table_prefix.'pages(name,urlname,namespace,protected,delvotes,delvote_ips) VALUES(\''.$filename.'\', \''.$urln.'\', \'File\', 0, 0, \'\')')) $db->_die('The page listing entry could not be inserted.');
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      if(!$db->sql_query('INSERT INTO '.table_prefix.'page_text(page_id,namespace,page_text,char_tag) VALUES(\''.$urln.'\', \'File\', \''.$comments.'\', \''.$chartag.'\')')) $db->_die('The page text entry could not be inserted.');
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    }
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    else
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    {
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      if(!$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.');
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    }
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    die_friendly('Upload complete', '<p>Your file has been uploaded successfully. View the <a href="'.makeUrlNS('File', $filename).'">file\'s page</a>.</p>');
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  }
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  else
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  {
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    $template->header();
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    $fn = $paths->getParam(0);
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    if ( $fn && !$session->get_permissions('upload_new_version') )
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    {
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      die_friendly('Access denied', '<p>Uploading new versions of files has been disabled for your user account or group.<p>');
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    }
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    ?>
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    <p>Using this form you can upload a file to the <?php echo getConfig('site_name'); ?> site.</p>
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    <p>The maximum file size is <?php 
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      // Get the max file size, and format it in a way that is user-friendly
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      $fs = getConfig('max_file_size');
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      echo commatize($fs).' bytes';
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      $fs = (int)$fs;
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      if($fs >= 1048576)
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      {
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        $fs = round($fs / 1048576, 1);
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        echo ' ('.$fs.' MB)';
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      }
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      elseif($fs >= 1024)
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      {
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        $fs = round($fs / 1024, 1);
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        echo ' ('.$fs.' KB)';
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parents:
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      }
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    ?>.</p>
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    <form action="<?php echo makeUrl($paths->page); ?>" method="post" enctype="multipart/form-data">
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      <table border="0" cellspacing="1" cellpadding="4">
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        <tr><td>File:</td><td><input name="data" type="file" size="40" /></td></tr>
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        <tr><td>Rename to:</td><td><input name="rename" type="text" size="40"<?php if($fn) echo ' value="'.$fn.'" readonly="readonly"'; ?> /></td></tr>
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parents:
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        <?php
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        if(!$fn) echo '<tr><td>Comments:<br />(can be wiki-formatted)</td><td><textarea name="comments" rows="20" cols="60"></textarea></td></tr>';
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parents:
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        else echo '<tr><td>Reason for uploading the new version: </td><td><input name="comments" size="50" /></td></tr>';
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        ?>
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        <tr><td colspan="2" style="text-align: center">
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          <?php
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   203
          if($fn)
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   204
            echo '<input type="hidden" name="update" value="true" />';
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diff changeset
   205
          ?>
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          <input type="submit" name="doit" value="Upload file" />
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        </td></tr>
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      </table>
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   209
    </form>
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    <?php
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   211
    $template->footer();
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  }
242
78a94f7bb5e3 Merge changes back from Nighthawk
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}                                                     
0
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   215
function page_Special_DownloadFile()
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   216
{
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   217
  global $db, $session, $paths, $template, $plugins; // Common objects
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   218
  global $do_gzip;
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  $filename = rawurldecode($paths->getParam(0));
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  $timeid = $paths->getParam(1);
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b3cfaf0a505c Fixed highlighting in search results; changed search algorithm to give more score for terms found in page title; hopefully (hackishly) fixed login_key_cache getting too long
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  if ( $timeid && preg_match('#^([0-9]+)$#', (string)$timeid) )
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  {
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diff changeset
   223
    $tid = ' AND time_id='.$timeid;
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diff changeset
   224
  }
b3cfaf0a505c Fixed highlighting in search results; changed search algorithm to give more score for terms found in page title; hopefully (hackishly) fixed login_key_cache getting too long
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diff changeset
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  else
b3cfaf0a505c Fixed highlighting in search results; changed search algorithm to give more score for terms found in page title; hopefully (hackishly) fixed login_key_cache getting too long
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  {
b3cfaf0a505c Fixed highlighting in search results; changed search algorithm to give more score for terms found in page title; hopefully (hackishly) fixed login_key_cache getting too long
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   227
    $tid = '';
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diff changeset
   228
  }
0
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parents:
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   229
  $filename = $db->escape($filename);
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   230
  $q = $db->sql_query('SELECT page_id,size,mimetype,time_id,file_extension,file_key FROM '.table_prefix.'files WHERE filename=\''.$filename.'\''.$tid.' ORDER BY time_id DESC;');
292
b3cfaf0a505c Fixed highlighting in search results; changed search algorithm to give more score for terms found in page title; hopefully (hackishly) fixed login_key_cache getting too long
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parents: 230
diff changeset
   231
  if ( !$q )
b3cfaf0a505c Fixed highlighting in search results; changed search algorithm to give more score for terms found in page title; hopefully (hackishly) fixed login_key_cache getting too long
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   232
  {
b3cfaf0a505c Fixed highlighting in search results; changed search algorithm to give more score for terms found in page title; hopefully (hackishly) fixed login_key_cache getting too long
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   233
    $db->_die('The file data could not be selected.');
b3cfaf0a505c Fixed highlighting in search results; changed search algorithm to give more score for terms found in page title; hopefully (hackishly) fixed login_key_cache getting too long
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diff changeset
   234
  }
b3cfaf0a505c Fixed highlighting in search results; changed search algorithm to give more score for terms found in page title; hopefully (hackishly) fixed login_key_cache getting too long
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diff changeset
   235
  if ( $db->numrows() < 1 )
b3cfaf0a505c Fixed highlighting in search results; changed search algorithm to give more score for terms found in page title; hopefully (hackishly) fixed login_key_cache getting too long
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  {
b3cfaf0a505c Fixed highlighting in search results; changed search algorithm to give more score for terms found in page title; hopefully (hackishly) fixed login_key_cache getting too long
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    header('HTTP/1.1 404 Not Found');
b3cfaf0a505c Fixed highlighting in search results; changed search algorithm to give more score for terms found in page title; hopefully (hackishly) fixed login_key_cache getting too long
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diff changeset
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    die_friendly('File not found', '<p>The file "'.$filename.'" cannot be found.</p>');
b3cfaf0a505c Fixed highlighting in search results; changed search algorithm to give more score for terms found in page title; hopefully (hackishly) fixed login_key_cache getting too long
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diff changeset
   239
  }
0
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  $row = $db->fetchrow();
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   241
  $db->free_result();
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diff changeset
   242
  
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diff changeset
   243
  // Check permissions
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   244
  $perms = $session->fetch_page_acl($row['page_id'], 'File');
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diff changeset
   245
  if ( !$perms->get_permissions('read') )
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diff changeset
   246
  {
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   247
    die_friendly('Access denied', '<p>Access to the specified file is denied.</p>');
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diff changeset
   248
  }
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diff changeset
   249
  
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  $fname = ENANO_ROOT . '/files/' . $row['file_key'] . '_' . $row['time_id'] . $row['file_extension'];
230
3daa715e0f69 Alternate scaling using GD is implemented now; images will be scaled with ImageMagick if enabled and working; else, GD will be used. No UI changes to speak of, but a check in the installer will be added in a later commit
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3daa715e0f69 Alternate scaling using GD is implemented now; images will be scaled with ImageMagick if enabled and working; else, GD will be used. No UI changes to speak of, but a check in the installer will be added in a later commit
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   252
  if ( isset($_GET['preview']) && substr($row['mimetype'], 0, 6) == 'image/' )
0
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parents:
diff changeset
   253
  {
230
3daa715e0f69 Alternate scaling using GD is implemented now; images will be scaled with ImageMagick if enabled and working; else, GD will be used. No UI changes to speak of, but a check in the installer will be added in a later commit
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    // Determine appropriate width and height
3daa715e0f69 Alternate scaling using GD is implemented now; images will be scaled with ImageMagick if enabled and working; else, GD will be used. No UI changes to speak of, but a check in the installer will be added in a later commit
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diff changeset
   255
    $width  = ( isset($_GET['width'])  ) ? intval($_GET['width'] ) : 320;
3daa715e0f69 Alternate scaling using GD is implemented now; images will be scaled with ImageMagick if enabled and working; else, GD will be used. No UI changes to speak of, but a check in the installer will be added in a later commit
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diff changeset
   256
    $height = ( isset($_GET['height']) ) ? intval($_GET['height']) : 320;
3daa715e0f69 Alternate scaling using GD is implemented now; images will be scaled with ImageMagick if enabled and working; else, GD will be used. No UI changes to speak of, but a check in the installer will be added in a later commit
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diff changeset
   257
    $cache_filename = ENANO_ROOT . "/cache/{$filename}-{$row['time_id']}-{$width}x{$height}{$row['file_extension']}";
3daa715e0f69 Alternate scaling using GD is implemented now; images will be scaled with ImageMagick if enabled and working; else, GD will be used. No UI changes to speak of, but a check in the installer will be added in a later commit
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diff changeset
   258
    if ( file_exists($cache_filename) )
3daa715e0f69 Alternate scaling using GD is implemented now; images will be scaled with ImageMagick if enabled and working; else, GD will be used. No UI changes to speak of, but a check in the installer will be added in a later commit
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   259
    {
3daa715e0f69 Alternate scaling using GD is implemented now; images will be scaled with ImageMagick if enabled and working; else, GD will be used. No UI changes to speak of, but a check in the installer will be added in a later commit
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parents: 192
diff changeset
   260
      $fname = $cache_filename;
3daa715e0f69 Alternate scaling using GD is implemented now; images will be scaled with ImageMagick if enabled and working; else, GD will be used. No UI changes to speak of, but a check in the installer will be added in a later commit
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parents: 192
diff changeset
   261
    }
3daa715e0f69 Alternate scaling using GD is implemented now; images will be scaled with ImageMagick if enabled and working; else, GD will be used. No UI changes to speak of, but a check in the installer will be added in a later commit
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diff changeset
   262
    else
3daa715e0f69 Alternate scaling using GD is implemented now; images will be scaled with ImageMagick if enabled and working; else, GD will be used. No UI changes to speak of, but a check in the installer will be added in a later commit
Dan
parents: 192
diff changeset
   263
    {
3daa715e0f69 Alternate scaling using GD is implemented now; images will be scaled with ImageMagick if enabled and working; else, GD will be used. No UI changes to speak of, but a check in the installer will be added in a later commit
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parents: 192
diff changeset
   264
      $allow_scale = false;
3daa715e0f69 Alternate scaling using GD is implemented now; images will be scaled with ImageMagick if enabled and working; else, GD will be used. No UI changes to speak of, but a check in the installer will be added in a later commit
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parents: 192
diff changeset
   265
      $orig_fname = $fname;
3daa715e0f69 Alternate scaling using GD is implemented now; images will be scaled with ImageMagick if enabled and working; else, GD will be used. No UI changes to speak of, but a check in the installer will be added in a later commit
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      // is caching enabled?
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      if ( getConfig('cache_thumbs') == '1' )
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      {
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        $fname = $cache_filename;
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        if ( is_writeable(dirname($fname)) )
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        {
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          $allow_scale = true;
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        }
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      }
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      else
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      {
3daa715e0f69 Alternate scaling using GD is implemented now; images will be scaled with ImageMagick if enabled and working; else, GD will be used. No UI changes to speak of, but a check in the installer will be added in a later commit
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        // Get a temporary file
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        // In this case, the file will not be cached and will be scaled each time it's requested
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        $temp_dir = ( is_dir('/tmp') ) ? '/tmp' : ( isset($_ENV['TEMP']) ) ? $_ENV['TEMP'] : 'SOME RANDOM NAME';
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        // if tempnam() cannot use the specified directory name, it will fall back on the system default
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        $tempname = tempnam($temp_dir, $filename);
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        if ( $tempname && is_writeable($tempname) )
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        {
3daa715e0f69 Alternate scaling using GD is implemented now; images will be scaled with ImageMagick if enabled and working; else, GD will be used. No UI changes to speak of, but a check in the installer will be added in a later commit
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          $allow_scale = true;
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        }
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      }
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      if ( $allow_scale )
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      {
3daa715e0f69 Alternate scaling using GD is implemented now; images will be scaled with ImageMagick if enabled and working; else, GD will be used. No UI changes to speak of, but a check in the installer will be added in a later commit
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        $result = scale_image($orig_fname, $fname, $width, $height);
3daa715e0f69 Alternate scaling using GD is implemented now; images will be scaled with ImageMagick if enabled and working; else, GD will be used. No UI changes to speak of, but a check in the installer will be added in a later commit
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        if ( !$result )
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          $fname = $orig_fname;
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      }
3daa715e0f69 Alternate scaling using GD is implemented now; images will be scaled with ImageMagick if enabled and working; else, GD will be used. No UI changes to speak of, but a check in the installer will be added in a later commit
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      else
3daa715e0f69 Alternate scaling using GD is implemented now; images will be scaled with ImageMagick if enabled and working; else, GD will be used. No UI changes to speak of, but a check in the installer will be added in a later commit
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      {
3daa715e0f69 Alternate scaling using GD is implemented now; images will be scaled with ImageMagick if enabled and working; else, GD will be used. No UI changes to speak of, but a check in the installer will be added in a later commit
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        $fname = $orig_fname;
0
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      }
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    }
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  }
230
3daa715e0f69 Alternate scaling using GD is implemented now; images will be scaled with ImageMagick if enabled and working; else, GD will be used. No UI changes to speak of, but a check in the installer will be added in a later commit
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  $handle = @fopen($fname, 'r');
3daa715e0f69 Alternate scaling using GD is implemented now; images will be scaled with ImageMagick if enabled and working; else, GD will be used. No UI changes to speak of, but a check in the installer will be added in a later commit
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  if ( !$handle )
3daa715e0f69 Alternate scaling using GD is implemented now; images will be scaled with ImageMagick if enabled and working; else, GD will be used. No UI changes to speak of, but a check in the installer will be added in a later commit
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    die('Can\'t open output file for reading');
3daa715e0f69 Alternate scaling using GD is implemented now; images will be scaled with ImageMagick if enabled and working; else, GD will be used. No UI changes to speak of, but a check in the installer will be added in a later commit
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3daa715e0f69 Alternate scaling using GD is implemented now; images will be scaled with ImageMagick if enabled and working; else, GD will be used. No UI changes to speak of, but a check in the installer will be added in a later commit
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  $len = filesize($fname);
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  header('Content-type: '.$row['mimetype']);
230
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  if ( isset($_GET['download']) )
3daa715e0f69 Alternate scaling using GD is implemented now; images will be scaled with ImageMagick if enabled and working; else, GD will be used. No UI changes to speak of, but a check in the installer will be added in a later commit
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  {
3daa715e0f69 Alternate scaling using GD is implemented now; images will be scaled with ImageMagick if enabled and working; else, GD will be used. No UI changes to speak of, but a check in the installer will be added in a later commit
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    header('Content-disposition: attachment, filename="' . $filename . '";');
3daa715e0f69 Alternate scaling using GD is implemented now; images will be scaled with ImageMagick if enabled and working; else, GD will be used. No UI changes to speak of, but a check in the installer will be added in a later commit
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  }
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  header('Content-length: '.$len);
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  header('Last-Modified: '.date('r', $row['time_id']));
230
3daa715e0f69 Alternate scaling using GD is implemented now; images will be scaled with ImageMagick if enabled and working; else, GD will be used. No UI changes to speak of, but a check in the installer will be added in a later commit
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3daa715e0f69 Alternate scaling using GD is implemented now; images will be scaled with ImageMagick if enabled and working; else, GD will be used. No UI changes to speak of, but a check in the installer will be added in a later commit
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  // using this method limits RAM consumption
3daa715e0f69 Alternate scaling using GD is implemented now; images will be scaled with ImageMagick if enabled and working; else, GD will be used. No UI changes to speak of, but a check in the installer will be added in a later commit
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  while ( !feof($handle) )
3daa715e0f69 Alternate scaling using GD is implemented now; images will be scaled with ImageMagick if enabled and working; else, GD will be used. No UI changes to speak of, but a check in the installer will be added in a later commit
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  {
3daa715e0f69 Alternate scaling using GD is implemented now; images will be scaled with ImageMagick if enabled and working; else, GD will be used. No UI changes to speak of, but a check in the installer will be added in a later commit
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    echo fread($handle, 512000);
3daa715e0f69 Alternate scaling using GD is implemented now; images will be scaled with ImageMagick if enabled and working; else, GD will be used. No UI changes to speak of, but a check in the installer will be added in a later commit
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  }
3daa715e0f69 Alternate scaling using GD is implemented now; images will be scaled with ImageMagick if enabled and working; else, GD will be used. No UI changes to speak of, but a check in the installer will be added in a later commit
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  fclose($handle);
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80
cb7dde69c301 Improved and enabled HTML optimization algorithm; enabled gzip compression; added but did not test at all the tag cloud class in includes/tagcloud.php, this is still very preliminary and not ready for any type of production use
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  gzip_output();
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  exit;
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}
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?>