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Editing: ms-files.php
<?php /** * Multisite upload handler. * * @since 3.0.0 * * @package WordPress * @subpackage Multisite */ define( 'MS_FILES_REQUEST', true ); define( 'SHORTINIT', true ); /** Load WordPress Bootstrap */ require_once dirname( __DIR__ ) . '/wp-load.php'; if ( ! is_multisite() ) { die( 'Multisite support not enabled' ); } ms_file_constants(); if ( '1' === $current_blog->archived || '1' === $current_blog->spam || '1' === $current_blog->deleted ) { status_header( 404 ); die( '404 — File not found.' ); } if ( ! defined( 'BLOGUPLOADDIR' ) ) { status_header( 500 ); die( '500 — Directory not configured.' ); } $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 ( ! str_contains( $_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; } $wp_last_modified = gmdate( 'D, d M Y H:i:s', filemtime( $file ) ); $wp_etag = '"' . md5( $wp_last_modified ) . '"'; header( "Last-Modified: $wp_last_modified GMT" ); header( 'ETag: ' . $wp_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. if ( isset( $_SERVER['HTTP_IF_NONE_MATCH'] ) ) { $client_etag = stripslashes( $_SERVER['HTTP_IF_NONE_MATCH'] ); } else { $client_etag = ''; } if ( isset( $_SERVER['HTTP_IF_MODIFIED_SINCE'] ) ) { $client_last_modified = trim( $_SERVER['HTTP_IF_MODIFIED_SINCE'] ); } else { $client_last_modified = ''; } // 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. $wp_modified_timestamp = strtotime( $wp_last_modified ); if ( ( $client_last_modified && $client_etag ) ? ( ( $client_modified_timestamp >= $wp_modified_timestamp ) && ( $client_etag === $wp_etag ) ) : ( ( $client_modified_timestamp >= $wp_modified_timestamp ) || ( $client_etag === $wp_etag ) ) ) { status_header( 304 ); exit; } // If we made it this far, just serve the file. readfile( $file ); flush();
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