<?php

/*

Plugin Name: Upload/download frontend

Plugin URI: http://enanocms.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

Author URI: http://enanocms.org/

*/

/*

 * Enano - an open-source CMS capable of wiki functions, Drupal-like sidebar blocks, and everything in between

 * Version 1.0.4

 * 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\'=>1,\'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();

    $ext = strtolower(substr($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']);

    $comments = ( isset($_POST['update']) ) ? $db->escape($_POST['comments']) : $db->escape(RenderMan::preprocess_text($_POST['comments'], false, false));

    $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'];

  if ( isset($_GET['preview']) && substr($row['mimetype'], 0, 6) == 'image/' )

  {

    // Determine appropriate width and height

    $width  = ( isset($_GET['width'])  ) ? intval($_GET['width'] ) : 320;

    $height = ( isset($_GET['height']) ) ? intval($_GET['height']) : 320;

    $cache_filename = ENANO_ROOT . "/cache/{$filename}-{$row['time_id']}-{$width}x{$height}{$row['file_extension']}";

    if ( file_exists($cache_filename) )

    {

      $fname = $cache_filename;

    }

    else

    {

      $allow_scale = false;

      $orig_fname = $fname;

      // is caching enabled?

      if ( getConfig('cache_thumbs') == '1' )

      {

        $fname = $cache_filename;

        if ( is_writeable(dirname($fname)) )

        {

          $allow_scale = true;

        }

      }

      else

      {

        // Get a temporary file

        // In this case, the file will not be cached and will be scaled each time it's requested

        $temp_dir = ( is_dir('/tmp') ) ? '/tmp' : ( isset($_ENV['TEMP']) ) ? $_ENV['TEMP'] : 'SOME RANDOM NAME';

        // if tempnam() cannot use the specified directory name, it will fall back on the system default

        $tempname = tempnam($temp_dir, $filename);

        if ( $tempname && is_writeable($tempname) )

        {

          $allow_scale = true;

        }

      }

      if ( $allow_scale )

      {

        $result = scale_image($orig_fname, $fname, $width, $height);

        if ( !$result )

          $fname = $orig_fname;

      }

      else

      {

        $fname = $orig_fname;

      }

    }

  }

  $handle = @fopen($fname, 'r');

  if ( !$handle )

    die('Can\'t open output file for reading');

  $len = filesize($fname);

  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']));

  // using this method limits RAM consumption

  while ( !feof($handle) )

  {

    echo fread($handle, 512000);

  }

  fclose($handle);

  gzip_output();

  exit;

}

?>