Ticket #15955: allow-utf8-filenames-on-windows.php

<?php
/*
Plugin Name: Allow UTF-8 Filenames on Windows
Plugin URI: http://core.trac.wordpress.org/ticket/15955
Description: A workaround for correct uploading of files with UTF-8 names on Windows systems.
Version: 0.1
Author: Sergey Biryukov
Author URI: http://profiles.wordpress.org/sergeybiryukov/
*/

function autfw_sanitize_file_name_for_windows($filename, $utf8 = false) {
        if ( seems_utf8($filename) == $utf8 )
                return $filename;

        // On Windows platforms, PHP will mangle non-ASCII characters, see http://bugs.php.net/bug.php?id=47096 
        if ( 'WIN' == substr( PHP_OS, 0, 3 ) ) {
                $codepage = 'Windows-' . trim( strstr( setlocale( LC_CTYPE, 0 ), '.' ), '.' );
                if ( function_exists( 'iconv' ) ) {
                        if ( false == $utf8 )
                                $filename = iconv( get_option( 'blog_charset' ), $codepage . '//IGNORE', $filename );
                        else
                                $filename = iconv( $codepage, get_option( 'blog_charset' ), $filename );
                } elseif ( function_exists( 'mb_convert_encoding' ) ) {
                        if ( false == $utf8 )
                                $filename = mb_convert_encoding( $filename, $codepage, get_option( 'blog_charset' ) );
                        else
                                $filename = mb_convert_encoding( $filename, get_option( 'blog_charset' ), $codepage );
                }
        }

        return $filename;
}
add_filter('wp_delete_file', 'autfw_sanitize_file_name_for_windows');
add_filter('get_attached_file', 'autfw_sanitize_file_name_for_windows');

function autfw_handle_upload_input($file) {
        $file['name'] = autfw_sanitize_file_name_for_windows($file['name']);
        return $file;
}
add_filter('wp_handle_upload_prefilter', 'autfw_handle_upload_input');

function autfw_handle_upload($file) {
        $file['file'] = autfw_sanitize_file_name_for_windows($file['file'], true);
        $file['url'] = autfw_sanitize_file_name_for_windows($file['url'], true);
        return $file;
}
add_filter('wp_handle_upload', 'autfw_handle_upload');

function autfw_update_attached_file($file) {
        return autfw_sanitize_file_name_for_windows($file, true);
}
add_filter('update_attached_file', 'autfw_update_attached_file');

function autfw_generate_attachment_metadata($metadata, $attachment_id) {
        $file = get_attached_file($attachment_id);

        remove_filter('wp_generate_attachment_metadata', 'autfw_generate_attachment_metadata');
        $metadata = wp_generate_attachment_metadata($attachment_id, $file);

        return autfw_update_attachment_metadata($metadata);
}
add_filter('wp_generate_attachment_metadata', 'autfw_generate_attachment_metadata', 10, 2);

function autfw_update_attachment_metadata($metadata) {
        $metadata['file'] = autfw_sanitize_file_name_for_windows($metadata['file'], true);

        if ( !empty($metadata['sizes']) ) {
                foreach ( (array) $metadata['sizes'] as $size => $resized ) {
                        $resized['file'] = autfw_sanitize_file_name_for_windows($resized['file'], true);
                        $metadata['sizes'][$size] = $resized;
                }
        }

        return $metadata;
}
add_filter('wp_update_attachment_metadata', 'autfw_update_attachment_metadata');

function autfw_update_post_metadata($foo, $object_id, $meta_key, $meta_value) {
        if ( '_wp_attachment_backup_sizes' !=  $meta_key )
                return null;

        foreach ( (array) $meta_value as $size => $resized ) {
                $resized['file'] = autfw_sanitize_file_name_for_windows($resized['file'], true);
                $meta_value[$size] = $resized;
        }

        remove_filter('update_post_metadata', 'autfw_update_post_metadata', 10, 4);
        update_metadata('post', $object_id, $meta_key, $meta_value);

        return true;
}
add_filter('update_post_metadata', 'autfw_update_post_metadata', 10, 4);
?>