wp-recache/includes/Activator.php

<?php
/**
 * Plugin activation handler.
 *
 * @package WP_Recache
 */

defined('ABSPATH') || exit;

class WP_Recache_Activator {

    /**
     * Run activation routines.
     */
    public static function activate() {
        self::create_cache_directory();
        self::set_default_options();
        self::create_cache_server();
        self::create_advanced_cache();
        self::set_wp_cache_constant(true);
        self::flush_rewrite_rules();
    }

    /**
     * Create cache directory.
     */
    private static function create_cache_directory() {
        if (!is_dir(WP_RECACHE_CACHE_PATH)) {
            wp_mkdir_p(WP_RECACHE_CACHE_PATH);
        }

        $htaccess = WP_RECACHE_CACHE_PATH . '.htaccess';
        if (!file_exists($htaccess)) {
            file_put_contents($htaccess, "<IfModule mod_authz_core.c>\nRequire all denied\n</IfModule>\n<IfModule !mod_authz_core.c>\nDeny from all\n</IfModule>\n");
        }

        $index = WP_RECACHE_CACHE_PATH . 'index.php';
        if (!file_exists($index)) {
            file_put_contents($index, '<?php // Silence is golden.');
        }
    }

    /**
     * Set default options.
     */
    private static function set_default_options() {
        $defaults = [
            'cache_enabled' => true,
            'separate_mobile_cache' => false,
            'exclude_urls' => ['/cart', '/checkout', '/my-account'],
            'rejected_cookies' => [
                'woocommerce_items_in_cart',
                'wp_woocommerce_session_*',
                'wp-postpass',
                'comment_author_*',
                'wordpress_*',
            ],
            'minify_css' => false,
            'minify_js' => false,
            'lazyload_images' => false,
            'preload_enabled' => false,
        ];

        foreach ($defaults as $key => $value) {
            if (get_option("wp_recache_{$key}") === false) {
                add_option("wp_recache_{$key}", $value);
            }
        }
    }

    /**
     * Write the standalone cache server required by the advanced-cache.php
     * drop-in. Must run without WordPress loaded.
     *
     * Public so Admin can regenerate the drop-in when options change.
     */
    public static function create_cache_server() {
        $rejected_cookies = get_option('wp_recache_rejected_cookies', [
            'woocommerce_items_in_cart',
            'wp_woocommerce_session_*',
            'wp-postpass',
            'comment_author_*',
            'wordpress_*',
        ]);

        $cookies_php = var_export($rejected_cookies, true);

        $content = '<?php
/**
 * WP Recache early cache serving.
 *
 * This file is automatically generated by WP Recache.
 * Do not edit this file manually.
 */

if (($_SERVER[\'REQUEST_METHOD\'] ?? \'GET\') !== \'GET\') {
    return;
}

if (!empty($_SERVER[\'QUERY_STRING\'])) {
    return;
}

$rejected_cookies = ' . $cookies_php . ';

foreach ($rejected_cookies as $cookie) {
    $cookie = trim($cookie);
    if ($cookie === \'\') {
        continue;
    }

    if (substr($cookie, -1) === \'*\') {
        $prefix = substr($cookie, 0, -1);
        foreach ($_COOKIE as $name => $value) {
            if (strpos($name, $prefix) === 0) {
                return;
            }
        }
    } else {
        if (isset($_COOKIE[$cookie])) {
            return;
        }
    }
}

$uri  = isset($_SERVER[\'REQUEST_URI\']) ? (string) parse_url($_SERVER[\'REQUEST_URI\'], PHP_URL_PATH) : \'/\';
$host = $_SERVER[\'HTTP_HOST\'] ?? \'\';
$file = WP_CONTENT_DIR . \'/cache/wp-recache/\' . md5($host . $uri) . \'.html\';

// With separate mobile cache enabled, files carry a -desktop/-mobile suffix,
// so the plain file never exists and serving falls through to WordPress.
if (file_exists($file)) {
    header(\'X-WP-Recache: HIT\');
    header(\'X-WP-Recache-Dropin: 1\');
    readfile($file);
    exit;
}
';

        file_put_contents(WP_CONTENT_DIR . '/wp-recache-cache.php', $content);
    }

    /**
     * Create advanced-cache.php drop-in.
     */
    private static function create_advanced_cache() {
        $advanced_cache = WP_CONTENT_DIR . '/advanced-cache.php';

        if (file_exists($advanced_cache)) {
            return;
        }

        $content = '<?php
/**
 * WP Recache advanced cache.
 *
 * This file is automatically generated by WP Recache.
 * Do not edit this file manually.
 */

defined(\'ABSPATH\') || exit;

if (file_exists(WP_CONTENT_DIR . \'/wp-recache-cache.php\')) {
    require_once WP_CONTENT_DIR . \'/wp-recache-cache.php\';
}
';

        file_put_contents($advanced_cache, $content);
    }

    /**
     * Add or remove the WP_CACHE constant in wp-config.php.
     *
     * Without it, WordPress never loads advanced-cache.php.
     *
     * @param bool $enable True to add the constant, false to remove it.
     */
    public static function set_wp_cache_constant($enable) {
        $marker = "define('WP_CACHE', true); // Added by WP Recache.\n";
        $config_path = ABSPATH . 'wp-config.php';

        if (!file_exists($config_path)) {
            $config_path = dirname(ABSPATH) . '/wp-config.php';
        }

        if (!file_exists($config_path) || !is_writable($config_path)) {
            return;
        }

        $content = file_get_contents($config_path);

        if ($enable) {
            if (strpos($content, $marker) !== false || preg_match("/define\s*\(\s*['\"]WP_CACHE['\"]\s*,\s*true\s*\)/", $content)) {
                return;
            }

            $content = preg_replace('/^<\?php/', "<?php\n" . $marker, $content, 1);
        } else {
            $content = str_replace($marker, '', $content);
        }

        file_put_contents($config_path, $content);
    }

    /**
     * Flush rewrite rules.
     */
    private static function flush_rewrite_rules() {
        flush_rewrite_rules();
    }
}