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inn-maintenance-mode.php
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<?php
// Plugin Name: INN Maintenance Mode | INN 维护模式
// Plugin URI: https://inn-studio.com/maintenance-mode
// Description: The site maintenance-mode plugin | 开启站点维护模式插件，内置两种自定义功能，请参见官网说明。
// Author: Km.Van
// Version: 5.0.0
// Author URI: https://inn-studio.com
// PHP Required: 7.3.0
declare(strict_types=1);
namespace InnStudio\Plugins\MaintenanceMode;
\defined('AUTH_KEY') || http_response_code(500) && exit;
final class MaintenanceMode
{
public const TOKEN_KEY = 'innMaintenanceModeToken';
public const DEFAULT_LANG = 'en-US';
public const LANGS = [
'Maintaining...' => [
'zh-CN' => '维护中……',
],
'%1$s in maintenance, we will come back soon! <small>(Auto-refresh in %2$d minutes)</small>' => [
'zh-CN' => '%1$s 正在更新维护中，请稍后再来吧！（页面 %2$d 分钟自动刷新）',
],
'Logged as administrator.' => [
'zh-CN' => '已作为管理员登陆。',
],
'Administrator token URL' => [
'zh-CN' => '管理员令牌地址',
],
'URL copied.' => [
'zh-CN' => '已复制到粘贴版。',
],
'Please copy URL manually.' => [
'zh-CN' => '请手动复制 URL 地址。',
],
'Unable to locate admin user.' => [
'zh-CN' => '无法定位管理员用户。',
],
];
private $remoteUrl = '';
private $refreshMinutes = 5;
private $localPagePath = ABSPATH . '/maintenance';
public function __construct()
{
if (\defined('\\INN_MAINTENANCE_MODE_REMOTE_URL') && filter_var(INN_MAINTENANCE_MODE_REMOTE_URL, \FILTER_VALIDATE_URL)) {
$this->remoteUrl = INN_MAINTENANCE_MODE_REMOTE_URL;
}
if (\defined('\\INN_MAINTENANCE_MODE_REFRESH_MINUTES') && filter_var(INN_MAINTENANCE_MODE_REFRESH_MINUTES, \FILTER_VALIDATE_INT)) {
$this->refreshMinutes = (int) INN_MAINTENANCE_MODE_REFRESH_MINUTES;
}
add_action('plugins_loaded', [$this, 'filterPluginsLoaded']);
add_filter('plugin_action_links', [$this, 'filterActionLink'], 10, 2);
}
public function filterPluginsLoaded(): void
{
$this->loginWithAdmin();
if (\defined('DOING_AJAX') && DOING_AJAX) {
return;
}
if ($this->isWpRestful()) {
return;
}
if (current_user_can('manage_options')) {
return;
}
$this->dieWithRemotePage();
$this->dieWithLocalPage();
$this->dieWithWpDie();
}
public function filterActionLink($actions, string $pluginFile): array
{
if (false !== mb_stripos($pluginFile, basename(__DIR__))) {
$adminUrl = get_admin_url();
$tokenKey = self::TOKEN_KEY;
$url = "{$adminUrl}?{$tokenKey}={$this->genToken()}";
$opts = <<<HTML
<a id="inn-maintenance__copy" href="{$url}" class="button button-primary" style="line-height: 1.5; min-height: auto;">{$this->gettext('Administrator token URL')}</a>
<script>
;(function(){
var a = document.getElementById('inn-maintenance__copy');
a.addEventListener('click', function(e){
e.preventDefault();
try{
var input = document.createElement('input');
input.value = '{$url}';
document.body.append(input);
input.select();
document.execCommand('copy');
document.body.removeChild(input);
alert('{$this->gettext('URL copied.')}');
} catch (e){
alert('{$this->gettext('Please copy URL manually.')}');
}
})
})();
</script>
HTML;
if ( ! \is_array($actions)) {
$actions = [];
}
array_unshift($actions, $opts);
}
return $actions;
}
private function isWpRestful(): bool
{
return false !== mb_strpos($this->getCurrentUrl(), 'wp-json');
}
private function getCurrentUrl(): string
{
$scheme = is_ssl() ? 'https' : 'http';
return "{$scheme}://{$_SERVER['HTTP_HOST']}{$_SERVER['REQUEST_URI']}";
}
private function gettext(string $text): string
{
static $lang = null;
if (null === $lang) {
if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) {
$lang = explode(',', $_SERVER['HTTP_ACCEPT_LANGUAGE'])[0] ?? self::DEFAULT_LANG;
} else {
$lang = self::DEFAULT_LANG;
}
}
return self::LANGS[$text][$lang] ?? $text;
}
private function genToken(): string
{
return hash('sha512', AUTH_KEY);
}
private function getAdminRoleId(): string
{
global $wpdb;
$roles = get_option("{$wpdb->prefix}user_roles") ?: get_option('wp_user_roles') ?: [];
if ( ! $roles) {
return '';
}
foreach ($roles as $roleId => $role) {
$caps = $role['capabilities'] ?? [];
if ( ! $caps) {
continue;
}
if ((bool) ($caps['manage_options'] ?? false)) {
return $roleId;
}
}
return '';
}
private function loginWithAdmin(): void
{
$token = (string) filter_input(\INPUT_GET, self::TOKEN_KEY, \FILTER_DEFAULT);
if ( ! $token || $token !== $this->genToken()) {
return;
}
global $wpdb;
$sql = <<<SQL
SELECT `user_id` FROM `{$wpdb->prefix}usermeta`
WHERE (
`meta_key` = '{$wpdb->prefix}capabilities'
OR
`meta_key` = 'wp_capabilities'
)
AND `meta_value` LIKE %s
LIMIT 0, 1
SQL;
$meta = $wpdb->get_row($wpdb->prepare(
$sql,
"%{$this->getAdminRoleId()}%"
));
if ( ! $meta) {
exit(gettext('Unable to locate admin user'));
}
wp_set_current_user((int) $meta->user_id);
wp_set_auth_cookie((int) $meta->user_id, true);
$adminUrl = get_admin_url();
echo <<<HTML
<a href="{$adminUrl}">✔️ {$this->gettext('Logged as administrator.')}</a>
HTML;
exit;
}
private function dieWithRemotePage(): void
{
if ($this->remoteUrl) {
$content = file_get_contents($this->remoteUrl);
if ($content) {
exit($content);
}
}
}
private function dieWithLocalPage(): void
{
foreach (['html', 'php', 'htm'] as $ext) {
$filePath = "{$this->localPagePath}.{$ext}";
if ( ! is_file($filePath)) {
continue;
}
include $filePath;
exit;
}
}
private function dieWithWpDie(): void
{
http_response_code(503);
$lang = str_replace('_', '-', (string) get_option('WPLANG'));
$url = get_bloginfo('url');
$name = get_bloginfo('name');
$content = sprintf(
$this->gettext('%1$s in maintenance, we will come back soon! <small>(Auto-refresh in %2$d minutes)</small>'),
"<a href=\"{$url}\">{$name}</a>",
$this->refreshMinutes
) . $this->getRetryJs();
echo <<<HTML
<!DOCTYPE html>
<html lang="{$lang}">
<head>
<title>{$name} - {$this->gettext('Maintaining...')}</title>
<style>
body{background:#fafafa;margin:0;}
main{
text-align:center;
position:absolute;
top:40%;
color:#333;
width:100vw;
}
</style>
</head>
<body>
<main>{$content}</main>
</body>
</html>
HTML;
exit;
}
private function getRetryJs(): string
{
$seconds = $this->refreshMinutes * 60 * 1000;
return <<<HTML
<script>
;(() => {
setInterval(() => {
location.reload(true)
}, {$seconds})
})();</script>
HTML;
}
}
new MaintenanceMode();