Beiträge von cdetree

/* 
 * # x-forwarded-host.php #
 *
 * `HTTP_X_FORWARDED_HOST` header for the duration of a single request in WordPress.
 *
 * ## Installation ##
 * First, put this file into the `wp-includes` folder of a WordPress installation. 
 * Edit `wp-settings.php`. Just before the call to `wp_plugin_directory_constants`, 
 * add this line: require( ABSPATH . WPINC . '/x-forwarded-host.php' );
*/


define('XFH_SLUG', 'info');


// Return TRUE if this request has been forwarded.
function is_forwarded() {
    return array_key_exists('HTTP_X_FORWARDED_HOST', $_SERVER);
}


// Return a short output version of get_locale().
function get_s_locale() {
    $localeLong = get_locale();
    if ($localeLong != '') {
        $locale = preg_replace('@(?<=^..).*@', '', $localeLong);
    } else {
        $locale = 'en';
    }
    return $locale;
}


// Patch and return 'HTTP_X_FORWARDED_HOST'.
function forwarded_host() {
    if (is_forwarded()) {
        return $_SERVER['HTTP_X_FORWARDED_HOST'];
    }
}
// Patch and return 'REQUEST_URI'.
function patch_request_uri() {
    if (is_forwarded()) {
        return $_SERVER['REQUEST_URI'] . XFH_SLUG;
    }
}
// Patch and return 'SCRIPT_NAME'.
function patch_script_name() {
    if (is_forwarded()) {
        $locale = get_s_locale();
        if ($locale == 'de') {
            return "/" . XFH_SLUG . $_SERVER['SCRIPT_NAME'];
        } else {
            return "/" . $locale . "/" . XFH_SLUG . $_SERVER['SCRIPT_NAME'];
        }
    }
}
// Patch and return 'PHP_SELF'.
function patch_php_self() {
    if (is_forwarded()) {
        $locale = get_s_locale();
        if ($locale == 'de') {
            return "/" . XFH_SLUG . $_SERVER['PHP_SELF'];
        } else {
            return "/" . $locale . "/" . XFH_SLUG . $_SERVER['PHP_SELF'];
        }
    }
}


/* 
 * Create a base URL using the original `Host` header. Rather than trying to sort out 
 * whether to use `http` or `https`, just keep using whatever the scheme was for this 
 * request. This is a good strategy when using a reverse proxy because the proxy can 
 * handle redirecting all requests from http to https, for example.
 *
 * Also here the category slug is defined, for example "/category", in case of your 
 * reverse proxy config.
*/


// Return the forwarded modified and patched URL.
function forwarded_url() {
    if (is_forwarded()) {
        $host = forwarded_host();
        $locale = get_s_locale();
        if ($locale == 'de') {
            $complete = $host . "/" . XFH_SLUG . "/";
        } else {
            $complete = $host . "/" . $locale . "/" . XFH_SLUG;
        }
        return "http://$complete";        
    }
}


// Patch the `$_SERVER` superglobal, replacing the host with the forwarded host. 
// Some parts of wordpress (particularly `redirect_canonical`) use `
// $_SERVER['HTTP_HOST'],['HTTP_X_ORIG_HOST'],['REQUEST_URI'],
// ['SCRIPT_NAME'],['PHP_SELF'],['REMOTE_ADDR'].
function x_host_patch_server() {
    if (is_forwarded()) {
        $_SERVER['HTTP_X_ORIG_HOST'] = $_SERVER['HTTP_HOST'];
        $_SERVER['HTTP_HOST'] = forwarded_host();
        $_SERVER['REQUEST_URI'] = patch_request_uri();
        $_SERVER['SCRIPT_NAME'] = patch_script_name();
        $_SERVER['PHP_SELF'] = patch_php_self();
        $_SERVER['REMOTE_ADDR'] = $_SERVER['HTTP_X_FORWARDED_FOR'];             
    }
}


// Override the value of `home` and `siteurl`.
function x_host_patch_url() {
    if (!is_forwarded()) {
        return false;
    }
    return forwarded_url();
}


add_filter('pre_option_home',    'x_host_patch_url');
add_filter('pre_option_siteurl', 'x_host_patch_url');