/**
* Die with a maintenance message when conditions are met.
*
* Checks for a file in the WordPress root directory named ".maintenance".
* This file will contain the variable $upgrading, set to the time the file
* was created. If the file was created less than 10 minutes ago, WordPress
* enters maintenance mode and displays a message.
*
* The default message can be replaced by using a drop-in (maintenance.php in
* the wp-content directory).
*
* @since 3.0.0
* @access private
*
* @global int $upgrading the unix timestamp marking when upgrading WordPress began.
*/
function wp_maintenance()
{
if (!file_exists(ABSPATH . '.maintenance') || wp_installing()) {
return;
}
global $upgrading;
include ABSPATH . '.maintenance';
// If the $upgrading timestamp is older than 10 minutes, don't die.
if (time() - $upgrading >= 600) {
return;
}
if (file_exists(WP_CONTENT_DIR . '/maintenance.php')) {
require_once WP_CONTENT_DIR . '/maintenance.php';
die;
}
wp_load_translations_early();
$protocol = wp_get_server_protocol();
header("{$protocol} 503 Service Unavailable", true, 503);
header('Content-Type: text/html; charset=utf-8');
header('Retry-After: 600');
?>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml"<?php
if (is_rtl()) {
echo ' dir="rtl"';
}
?>
>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title><?php
_e('Maintenance');
?>
</title>
</head>
<body>
<h1><?php
_e('Briefly unavailable for scheduled maintenance. Check back in a minute.');
?>
</h1>
</body>
</html>
<?php
die;
}
/**
* Set HTTP status header.
*
* @since 2.0.0
* @since 4.4.0 Added the `$description` parameter.
*
* @see get_status_header_desc()
*
* @param int $code HTTP status code.
* @param string $description Optional. A custom description for the HTTP status.
*/
function status_header($code, $description = '')
{
if (!$description) {
$description = get_status_header_desc($code);
}
if (empty($description)) {
return;
}
$protocol = wp_get_server_protocol();
$status_header = "{$protocol} {$code} {$description}";
if (function_exists('apply_filters')) {
/**
* Filter an HTTP status header.
*
* @since 2.2.0
*
* @param string $status_header HTTP status header.
* @param int $code HTTP status code.
* @param string $description Description for the status code.
* @param string $protocol Server protocol.
*/
$status_header = apply_filters('status_header', $status_header, $code, $description, $protocol);
}
@header($status_header, true, $code);
}
/**
* Die with a maintenance message when conditions are met.
*
* Checks for a file in the WordPress root directory named ".maintenance".
* This file will contain the variable $upgrading, set to the time the file
* was created. If the file was created less than 10 minutes ago, WordPress
* enters maintenance mode and displays a message.
*
* The default message can be replaced by using a drop-in (maintenance.php in
* the wp-content directory).
*
* @since 3.0.0
* @access private
*
* @global int $upgrading the unix timestamp marking when upgrading WordPress began.
*/
function wp_maintenance()
{
if (!file_exists(ABSPATH . '.maintenance') || wp_installing()) {
return;
}
global $upgrading;
include ABSPATH . '.maintenance';
// If the $upgrading timestamp is older than 10 minutes, don't die.
if (time() - $upgrading >= 600) {
return;
}
/**
* Bypass the maintenance mode check
*
* This filter should *NOT* be used by plugins. It is designed for non-web
* runtimes. If this filter returns true, maintenance mode will not be
* active which can cause problems during updates for web site views.
*
* @since 4.6.0
*
* @param bool True to bypass maintenance
*/
if (apply_filters('bypass_maintenance_mode', false)) {
return;
}
if (file_exists(WP_CONTENT_DIR . '/maintenance.php')) {
require_once WP_CONTENT_DIR . '/maintenance.php';
die;
}
wp_load_translations_early();
$protocol = wp_get_server_protocol();
header("{$protocol} 503 Service Unavailable", true, 503);
header('Content-Type: text/html; charset=utf-8');
header('Retry-After: 600');
?>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml"<?php
if (is_rtl()) {
echo ' dir="rtl"';
}
?>
>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title><?php
_e('Maintenance');
?>
</title>
</head>
<body>
<h1><?php
_e('Briefly unavailable for scheduled maintenance. Check back in a minute.');
?>
</h1>
</body>
</html>
<?php
die;
}
/**
* Die with a maintenance message when conditions are met.
*
* Checks for a file in the WordPress root directory named ".maintenance".
* This file will contain the variable $upgrading, set to the time the file
* was created. If the file was created less than 10 minutes ago, WordPress
* enters maintenance mode and displays a message.
*
* The default message can be replaced by using a drop-in (maintenance.php in
* the wp-content directory).
*
* @since 3.0.0
* @access private
*
* @global int $upgrading the unix timestamp marking when upgrading WordPress began.
*/
function wp_maintenance()
{
if (!file_exists(ABSPATH . '.maintenance') || wp_installing()) {
return;
}
global $upgrading;
include ABSPATH . '.maintenance';
// If the $upgrading timestamp is older than 10 minutes, don't die.
if (time() - $upgrading >= 600) {
return;
}
/**
* Filters whether to enable maintenance mode.
*
* This filter runs before it can be used by plugins. It is designed for
* non-web runtimes. If this filter returns true, maintenance mode will be
* active and the request will end. If false, the request will be allowed to
* continue processing even if maintenance mode should be active.
*
* @since 4.6.0
*
* @param bool $enable_checks Whether to enable maintenance mode. Default true.
* @param int $upgrading The timestamp set in the .maintenance file.
*/
if (!apply_filters('enable_maintenance_mode', true, $upgrading)) {
return;
}
if (file_exists(WP_CONTENT_DIR . '/maintenance.php')) {
require_once WP_CONTENT_DIR . '/maintenance.php';
die;
}
wp_load_translations_early();
$protocol = wp_get_server_protocol();
header("{$protocol} 503 Service Unavailable", true, 503);
header('Content-Type: text/html; charset=utf-8');
header('Retry-After: 600');
?>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml"<?php
if (is_rtl()) {
echo ' dir="rtl"';
}
?>
>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title><?php
_e('Maintenance');
?>
</title>
</head>
<body>
<h1><?php
_e('Briefly unavailable for scheduled maintenance. Check back in a minute.');
?>
</h1>
</body>
</html>
<?php
die;
}
function status_header($code, $description = '')
{
if (!$description) {
$description = get_status_header_desc($code);
}
if (empty($description)) {
return;
}
$protocol = wp_get_server_protocol();
$status_header = "{$protocol} {$code} {$description}";
if (function_exists('apply_filters')) {
$status_header = apply_filters('status_header', $status_header, $code, $description, $protocol);
}
@header($status_header, true, $code);
}
/**
* Start page caching and hook into requests to complete it later
*
* @since 2.1.0
*
* @return void
*/
protected function start()
{
// Disabled
if ($this->max_age < 1) {
return;
}
// Necessary to prevent clients using cached version after login cookies
// set. If this is a problem, comment it out and remove all
// Last-Modified headers.
@header('Vary: Cookie', false);
// Things that define a unique page.
if (isset($_SERVER['QUERY_STRING'])) {
parse_str($_SERVER['QUERY_STRING'], $this->query);
}
// Get the server protocol
$protocol = wp_get_server_protocol();
// Build different versions for HTTP/1.1 and HTTP/2.0
if ('HTTP/1.0' !== $protocol) {
$this->unique['server_protocol'] = $_SERVER['SERVER_PROTOCOL'];
}
// Setup keys
$this->keys = array('host' => $_SERVER['HTTP_HOST'], 'method' => $_SERVER['REQUEST_METHOD'], 'path' => ($this->pos = strpos($_SERVER['REQUEST_URI'], '?')) ? substr($_SERVER['REQUEST_URI'], 0, $this->pos) : $_SERVER['REQUEST_URI'], 'query' => $this->query, 'extra' => $this->unique, 'ssl' => $this->is_ssl());
// Recreate the permalink from the URL
$scheme = true === $this->keys['ssl'] ? 'https://' : 'http://';
$this->permalink = $scheme . $this->keys['host'] . $this->keys['path'] . (isset($this->keys['query']['p']) ? "?p=" . $this->keys['query']['p'] : '');
$this->url_key = md5($this->permalink);
$this->url_version = (int) wp_cache_get("{$this->url_key}_version", $this->group);
// Setup keys and variants
$this->do_variants();
$this->generate_keys();
// Get the spider_cache
$this->cache = wp_cache_get($this->key, $this->group);
// Are we only caching frequently-requested pages?
if ($this->seconds < 1 || $this->times < 2) {
$this->do = true;
// No spider_cache item found, or ready to sample traffic again at
// the end of the spider_cache life?
} elseif (!is_array($this->cache) || $this->started >= $this->cache['time'] + $this->max_age - $this->seconds) {
wp_cache_add($this->req_key, 0, $this->group);
$this->requests = wp_cache_incr($this->req_key, 1, $this->group);
$this->do = (bool) ($this->requests >= $this->times);
}
// If the document has been updated and we are the first to notice, regenerate it.
if (true === $this->do && isset($this->cache['version']) && $this->cache['version'] < $this->url_version) {
$this->genlock = wp_cache_add("{$this->url_key}_genlock", 1, $this->group, 10);
}
// Did we find a spider_cached page that hasn't expired?
if (isset($this->cache['time']) && false === $this->genlock && $this->started < $this->cache['time'] + $this->cache['max_age']) {
// Issue redirect if cached and enabled
if ($this->cache['redirect_status'] && $this->cache['redirect_location'] && $this->cache_redirects) {
$status = $this->cache['redirect_status'];
$location = $this->cache['redirect_location'];
// From vars.php
$is_IIS = strpos($_SERVER['SERVER_SOFTWARE'], 'Microsoft-IIS') !== false || strpos($_SERVER['SERVER_SOFTWARE'], 'ExpressionDevServer') !== false;
$this->do_headers($this->headers);
if (!empty($is_IIS)) {
@header("Refresh: 0;url={$location}");
} else {
if (php_sapi_name() !== 'cgi-fcgi') {
$texts = array(300 => 'Multiple Choices', 301 => 'Moved Permanently', 302 => 'Found', 303 => 'See Other', 304 => 'Not Modified', 305 => 'Use Proxy', 306 => 'Reserved', 307 => 'Temporary Redirect');
isset($texts[$status]) ? @header("{$protocol} {$status} {$texts[$status]}") : @header("{$protocol} 302 Found");
}
@header("Location: {$location}");
}
exit;
}
// Respect ETags served with feeds.
$three_oh_four = false;
if (isset($_SERVER['HTTP_IF_NONE_MATCH']) && isset($this->cache['headers']['ETag'][0]) && $_SERVER['HTTP_IF_NONE_MATCH'] == $this->cache['headers']['ETag'][0]) {
$three_oh_four = true;
// Respect If-Modified-Since.
} elseif ($this->cache_control && isset($_SERVER['HTTP_IF_MODIFIED_SINCE'])) {
$client_time = strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE']);
$cache_time = isset($this->cache['headers']['Last-Modified'][0]) ? strtotime($this->cache['headers']['Last-Modified'][0]) : $this->cache['time'];
if ($client_time >= $cache_time) {
$three_oh_four = true;
}
}
// Use the spider_cache save time for Last-Modified so we can issue
// "304 Not Modified" but don't clobber a cached Last-Modified header.
if ($this->cache_control && !isset($this->cache['headers']['Last-Modified'][0])) {
@header('Last-Modified: ' . gmdate('D, d M Y H:i:s', $this->cache['time']) . ' GMT', true);
@header('Cache-Control: max-age=' . ($this->cache['max_age'] - $this->started + $this->cache['time']) . ', must-revalidate', true);
}
// Add some debug info just before </head>
if (true === $this->debug) {
$this->add_debug_from_cache();
}
$this->do_headers($this->headers, $this->cache['headers']);
// Bail if not modified
if (true === $three_oh_four) {
@header("HTTP/1.1 304 Not Modified", true, 304);
die;
}
// Set header if cached
if (!empty($this->cache['status_header'])) {
@header($this->cache['status_header'], true);
}
// Have you ever heard a death rattle before?
die($this->cache['output']);
}
// Didn't meet the minimum condition?
if (false === $this->do && false === $this->genlock) {
return;
}
// Headers and such
add_filter('status_header', array($this, 'status_header'), 10, 2);
add_filter('wp_redirect_status', array($this, 'redirect_status'), 10, 2);
// Start the spidey-sense listening
ob_start(array($this, 'ob'));
}
