Wordpress/wp-admin/async-upload.php

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<?php
/* This accepts file uploads from swfupload or other asynchronous upload methods.
*/
if ( defined('ABSPATH') )
require_once( ABSPATH . 'wp-config.php');
else
require_once('../wp-config.php');
// Flash often fails to send cookies with the POST or upload, so we need to pass it in GET or POST instead
if ( empty($_COOKIE[AUTH_COOKIE]) && !empty($_REQUEST['auth_cookie']) )
$_COOKIE[AUTH_COOKIE] = $_REQUEST['auth_cookie'];
unset($current_user);
require_once('admin.php');
header('Content-Type: text/plain');
if ( !current_user_can('upload_files') )
wp_die(__('You do not have permission to upload files.'));
// just fetch the detail form for that attachment
if ( ($id = intval($_REQUEST['attachment_id'])) && $_REQUEST['fetch'] ) {
echo get_media_item($id);
exit;
}
$id = media_handle_upload('async-upload', $_REQUEST['post_id']);
if (is_wp_error($id)) {
echo '<div id="media-upload-error">'.wp_specialchars($id->get_error_message()).'</div>';
exit;
}
if ( $_REQUEST['short'] ) {
// short form response - attachment ID only
echo $id;
}
else {
// long form response - big chunk o html
$type = $_REQUEST['type'];
echo apply_filters("async_upload_{$type}", $id);
}
?>