<?php

/**

 * Multisite upload handler.

 *

 * @since 3.0.0

 *

 * @package WordPress

 * @subpackage Multisite

 */

define( 'SHORTINIT', true );

require_once( dirname( dirname( __FILE__ ) ) . '/wp-load.php' );

if ( ! is_multisite() ) {

	die( 'Multisite support not enabled' );

}

ms_file_constants();

error_reporting( 0 );

if ( $current_blog->archived == '1' || $current_blog->spam == '1' || $current_blog->deleted == '1' ) {

	status_header( 404 );

	die( '404 — File not found.' );

}

$file = rtrim( BLOGUPLOADDIR, '/' ) . '/' . str_replace( '..', '', $_GET['file'] );

if ( ! is_file( $file ) ) {

	status_header( 404 );

	die( '404 — File not found.' );

}

$mime = wp_check_filetype( $file );

if ( false === $mime['type'] && function_exists( 'mime_content_type' ) ) {

	$mime['type'] = mime_content_type( $file );

}

if ( $mime['type'] ) {

	$mimetype = $mime['type'];

} else {

	$mimetype = 'image/' . substr( $file, strrpos( $file, '.' ) + 1 );

}

header( 'Content-Type: ' . $mimetype ); // always send this

if ( false === strpos( $_SERVER['SERVER_SOFTWARE'], 'Microsoft-IIS' ) ) {

	header( 'Content-Length: ' . filesize( $file ) );

}

// Optional support for X-Sendfile and X-Accel-Redirect

if ( WPMU_ACCEL_REDIRECT ) {

	header( 'X-Accel-Redirect: ' . str_replace( WP_CONTENT_DIR, '', $file ) );

	exit;

} elseif ( WPMU_SENDFILE ) {

	header( 'X-Sendfile: ' . $file );

	exit;

}

$last_modified = gmdate( 'D, d M Y H:i:s', filemtime( $file ) );

$etag          = '"' . md5( $last_modified ) . '"';

header( "Last-Modified: $last_modified GMT" );

header( 'ETag: ' . $etag );

header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', time() + 100000000 ) . ' GMT' );

// Support for Conditional GET - use stripslashes to avoid formatting.php dependency

$client_etag = isset( $_SERVER['HTTP_IF_NONE_MATCH'] ) ? stripslashes( $_SERVER['HTTP_IF_NONE_MATCH'] ) : false;

if ( ! isset( $_SERVER['HTTP_IF_MODIFIED_SINCE'] ) ) {

	$_SERVER['HTTP_IF_MODIFIED_SINCE'] = false;

}

$client_last_modified = trim( $_SERVER['HTTP_IF_MODIFIED_SINCE'] );

// If string is empty, return 0. If not, attempt to parse into a timestamp

$client_modified_timestamp = $client_last_modified ? strtotime( $client_last_modified ) : 0;

// Make a timestamp for our most recent modification...

$modified_timestamp = strtotime( $last_modified );

if ( ( $client_last_modified && $client_etag )

	? ( ( $client_modified_timestamp >= $modified_timestamp ) && ( $client_etag == $etag ) )

	: ( ( $client_modified_timestamp >= $modified_timestamp ) || ( $client_etag == $etag ) )

	) {

	status_header( 304 );

	exit;

}

// If we made it this far, just serve the file

readfile( $file );

flush();