<?php

/**
 * Cloud service cls
 *
 * @since      3.0
 */

namespace LiteSpeed;

defined('WPINC') || exit();

class Cloud extends Base
{
	const LOG_TAG = '❄️';
	const CLOUD_SERVER = 'https://api.quic.cloud';
	const CLOUD_IPS = 'https://quic.cloud/ips';
	const CLOUD_SERVER_DASH = 'https://my.quic.cloud';
	const CLOUD_SERVER_WP = 'https://wpapi.quic.cloud';

	const SVC_D_NODES = 'd/nodes';
	const SVC_D_SYNC_CONF = 'd/sync_conf';
	const SVC_D_USAGE = 'd/usage';
	const SVC_D_SETUP_TOKEN = 'd/get_token';
	const SVC_D_DEL_CDN_DNS = 'd/del_cdn_dns';
	const SVC_PAGE_OPTM = 'page_optm';
	const SVC_CCSS = 'ccss';
	const SVC_UCSS = 'ucss';
	const SVC_VPI = 'vpi';
	const SVC_LQIP = 'lqip';
	const SVC_QUEUE = 'queue';
	const SVC_IMG_OPTM = 'img_optm';
	const SVC_HEALTH = 'health';
	const SVC_CDN = 'cdn';

	const BM_IMG_OPTM_PRIO = 16;
	const BM_IMG_OPTM_JUMBO_GROUP = 32;
	const IMG_OPTM_JUMBO_GROUP = 1000;
	const IMG_OPTM_DEFAULT_GROUP = 200;

	const IMGOPTM_TAKEN = 'img_optm-taken';

	const TTL_NODE = 3; // Days before node expired
	const EXPIRATION_REQ = 300; // Seconds of min interval between two unfinished requests
	const EXPIRATION_TOKEN = 900; // Min intval to request a token 15m
	const TTL_IPS = 3; // Days for node ip list cache

	const API_REPORT = 'wp/report';
	const API_NEWS = 'news';
	const API_VER = 'ver_check';
	const API_BETA_TEST = 'beta_test';

	private static $CENTER_SVC_SET = array(
		self::SVC_D_NODES,
		self::SVC_D_SYNC_CONF,
		self::SVC_D_USAGE,
		// self::API_NEWS,
		self::API_REPORT,
		// self::API_VER,
		// self::API_BETA_TEST,
		self::SVC_D_SETUP_TOKEN,
		self::SVC_D_DEL_CDN_DNS,
	);

	private static $WP_SVC_SET = array(self::API_NEWS, self::API_VER, self::API_BETA_TEST);

	// No api key needed for these services
	private static $_PUB_SVC_SET = array(self::API_NEWS, self::API_REPORT, self::API_VER, self::API_BETA_TEST);

	private static $_QUEUE_SVC_SET = array(self::SVC_UCSS, self::SVC_VPI);

	public static $SERVICES_LOAD_CHECK = array(
		self::SVC_CCSS,
		// self::SVC_UCSS,
		// self::SVC_VPI,
		self::SVC_LQIP,
		self::SVC_HEALTH,
	);

	public static $SERVICES = array(
		self::SVC_IMG_OPTM,
		self::SVC_PAGE_OPTM,
		self::SVC_CCSS,
		self::SVC_UCSS,
		self::SVC_VPI,
		self::SVC_LQIP,
		self::SVC_CDN,
		self::SVC_HEALTH,
		// self::SVC_QUEUE,
	);

	const TYPE_CLEAR_PROMO = 'clear_promo';
	const TYPE_REDETECT_CLOUD = 'redetect_cloud';
	const TYPE_CLEAR_CLOUD = 'clear_cloud';
	const TYPE_GEN_KEY = 'gen_key';
	const TYPE_LINK = 'link';
	const TYPE_SYNC_USAGE = 'sync_usage';

	private $_setup_token;
	protected $_summary;

	/**
	 * Init
	 *
	 * @since  3.0
	 */
	public function __construct()
	{
		$this->_setup_token = $this->conf(self::O_QC_TOKEN);
		$this->_summary = self::get_summary();
	}

	/**
	 * Get api key from conf
	 * @since 5.3
	 */
	private function _api_key()
	{
		return $this->conf(self::O_API_KEY);
	}

	/**
	 * Show latest commit version always if is on dev
	 *
	 * @since 3.0
	 */
	public function check_dev_version()
	{
		if (!preg_match('/[^\d\.]/', Core::VER)) {
			return;
		}

		$last_check = empty($this->_summary['last_request.' . self::API_VER]) ? 0 : $this->_summary['last_request.' . self::API_VER];

		if (time() - $last_check > 86400) {
			$auto_v = self::version_check('dev');
			if (!empty($auto_v['dev'])) {
				self::save_summary(array('version.dev' => $auto_v['dev']));
			}
		}

		if (empty($this->_summary['version.dev'])) {
			return;
		}

		self::debug('Latest dev version ' . $this->_summary['version.dev']);

		if (version_compare($this->_summary['version.dev'], Core::VER, '<=')) {
			return;
		}

		// Show the dev banner
		require_once LSCWP_DIR . 'tpl/banner/new_version_dev.tpl.php';
	}

	/**
	 * Check latest version
	 *
	 * @since  2.9
	 * @access public
	 */
	public static function version_check($src = false)
	{
		$req_data = array(
			'v' => defined('LSCWP_CUR_V') ? LSCWP_CUR_V : '',
			'src' => $src,
			'php' => phpversion(),
		);
		if (defined('LITESPEED_ERR')) {
			$req_data['err'] = base64_encode(!is_string(LITESPEED_ERR) ? \json_encode(LITESPEED_ERR) : LITESPEED_ERR);
		}
		$data = self::post(self::API_VER, $req_data);

		return $data;
	}

	/**
	 * Show latest news
	 *
	 * @since 3.0
	 */
	public function news()
	{
		$this->_update_news();

		if (empty($this->_summary['news.new'])) {
			return;
		}

		if (!empty($this->_summary['news.plugin']) && Activation::cls()->dash_notifier_is_plugin_active($this->_summary['news.plugin'])) {
			return;
		}

		require_once LSCWP_DIR . 'tpl/banner/cloud_news.tpl.php';
	}

	/**
	 * Update latest news
	 *
	 * @since 2.9.9.1
	 */
	private function _update_news()
	{
		if (!empty($this->_summary['news.utime']) && time() - $this->_summary['news.utime'] < 86400 * 7) {
			return;
		}

		self::save_summary(array('news.utime' => time()));

		$data = self::get(self::API_NEWS);
		if (empty($data['id'])) {
			return;
		}

		// Save news
		if (!empty($this->_summary['news.id']) && $this->_summary['news.id'] == $data['id']) {
			return;
		}

		$this->_summary['news.id'] = $data['id'];
		$this->_summary['news.plugin'] = !empty($data['plugin']) ? $data['plugin'] : '';
		$this->_summary['news.title'] = !empty($data['title']) ? $data['title'] : '';
		$this->_summary['news.content'] = !empty($data['content']) ? $data['content'] : '';
		$this->_summary['news.zip'] = !empty($data['zip']) ? $data['zip'] : '';
		$this->_summary['news.new'] = 1;

		if ($this->_summary['news.plugin']) {
			$plugin_info = Activation::cls()->dash_notifier_get_plugin_info($this->_summary['news.plugin']);
			if ($plugin_info && !empty($plugin_info->name)) {
				$this->_summary['news.plugin_name'] = $plugin_info->name;
			}
		}

		self::save_summary();
	}

	/**
	 * Check if contains a package in a service or not
	 *
	 * @since  4.0
	 */
	public function has_pkg($service, $pkg)
	{
		if (!empty($this->_summary['usage.' . $service]['pkgs']) && $this->_summary['usage.' . $service]['pkgs'] & $pkg) {
			return true;
		}

		return false;
	}

	/**
	 * Get allowance of current service
	 *
	 * @since  3.0
	 * @access private
	 */
	public function allowance($service, &$err = false)
	{
		// Only auto sync usage at most one time per day
		if (empty($this->_summary['last_request.' . self::SVC_D_USAGE]) || time() - $this->_summary['last_request.' . self::SVC_D_USAGE] > 86400) {
			$this->sync_usage();
		}

		if (in_array($service, array(self::SVC_CCSS, self::SVC_UCSS, self::SVC_VPI))) {
			// @since 4.2
			$service = self::SVC_PAGE_OPTM;
		}

		if (empty($this->_summary['usage.' . $service])) {
			return 0;
		}
		$usage = $this->_summary['usage.' . $service];

		// Image optm is always free
		$allowance_max = 0;
		if ($service == self::SVC_IMG_OPTM) {
			$allowance_max = self::IMG_OPTM_DEFAULT_GROUP;
			if (!empty($usage['pkgs']) && $usage['pkgs'] & self::BM_IMG_OPTM_JUMBO_GROUP) {
				$allowance_max = self::IMG_OPTM_JUMBO_GROUP;
			}
		}

		$allowance = $usage['quota'] - $usage['used'];

		$err = 'out_of_quota';

		if ($allowance > 0) {
			if ($allowance_max && $allowance_max < $allowance) {
				$allowance = $allowance_max;
			}

			// Daily limit @since 4.2
			if (isset($usage['remaining_daily_quota']) && $usage['remaining_daily_quota'] >= 0 && $usage['remaining_daily_quota'] < $allowance) {
				$allowance = $usage['remaining_daily_quota'];
				if (!$allowance) {
					$err = 'out_of_daily_quota';
				}
			}

			return $allowance;
		}

		// Check Pay As You Go balance
		if (empty($usage['pag_bal'])) {
			return $allowance_max;
		}

		if ($allowance_max && $allowance_max < $usage['pag_bal']) {
			return $allowance_max;
		}

		return $usage['pag_bal'];
	}

	/**
	 * Sync Cloud usage summary data
	 *
	 * @since  3.0
	 * @access public
	 */
	public function sync_usage()
	{
		$usage = $this->_post(self::SVC_D_USAGE);
		if (!$usage) {
			return;
		}

		self::debug('sync_usage ' . \json_encode($usage));

		foreach (self::$SERVICES as $v) {
			$this->_summary['usage.' . $v] = !empty($usage[$v]) ? $usage[$v] : false;
		}

		self::save_summary();

		return $this->_summary;
	}

	/**
	 * Clear all existing cloud nodes for future reconnect
	 *
	 * @since  3.0
	 * @access public
	 */
	public function clear_cloud()
	{
		foreach (self::$SERVICES as $service) {
			if (isset($this->_summary['server.' . $service])) {
				unset($this->_summary['server.' . $service]);
			}
			if (isset($this->_summary['server_date.' . $service])) {
				unset($this->_summary['server_date.' . $service]);
			}
		}
		self::save_summary();

		self::debug('Cleared all local service node caches');
	}

	/**
	 * ping clouds to find the fastest node
	 *
	 * @since  3.0
	 * @access public
	 */
	public function detect_cloud($service, $force = false)
	{
		if (in_array($service, self::$CENTER_SVC_SET)) {
			return self::CLOUD_SERVER;
		}

		if (in_array($service, self::$WP_SVC_SET)) {
			return self::CLOUD_SERVER_WP;
		}

		// Check if the stored server needs to be refreshed
		if (!$force) {
			if (
				!empty($this->_summary['server.' . $service]) &&
				!empty($this->_summary['server_date.' . $service]) &&
				$this->_summary['server_date.' . $service] > time() - 86400 * self::TTL_NODE
			) {
				return $this->_summary['server.' . $service];
			}
		}

		if (!$service || !in_array($service, self::$SERVICES)) {
			$msg = __('Cloud Error', 'litespeed-cache') . ': ' . $service;
			Admin_Display::error($msg);
			return false;
		}

		// Send request to Quic Online Service
		$json = $this->_post(self::SVC_D_NODES, array('svc' => $this->_maybe_queue($service)));

		// Check if get list correctly
		if (empty($json['list']) || !is_array($json['list'])) {
			self::debug('request cloud list failed: ', $json);

			if ($json) {
				$msg = __('Cloud Error', 'litespeed-cache') . ": [Service] $service [Info] " . \json_encode($json);
				Admin_Display::error($msg);
			}

			return false;
		}

		// Ping closest cloud
		$speed_list = array();
		foreach ($json['list'] as $v) {
			// Exclude possible failed 503 nodes
			if (!empty($this->_summary['disabled_node']) && !empty($this->_summary['disabled_node'][$v]) && time() - $this->_summary['disabled_node'][$v] < 86400) {
				continue;
			}
			$speed_list[$v] = Utility::ping($v);
		}

		if (!$speed_list) {
			self::debug('nodes are in 503 failed nodes');
			return false;
		}

		$min = min($speed_list);

		if ($min == 99999) {
			self::debug('failed to ping all clouds');
			return false;
		}

		// Random pick same time range ip (230ms 250ms)
		$range_len = strlen($min);
		$range_num = substr($min, 0, 1);
		$valid_clouds = array();
		foreach ($speed_list as $node => $speed) {
			if (strlen($speed) == $range_len && substr($speed, 0, 1) == $range_num) {
				$valid_clouds[] = $node;
			}
			// Append the lower speed ones
			elseif ($speed < $min * 4) {
				$valid_clouds[] = $node;
			}
		}

		if (!$valid_clouds) {
			$msg = __('Cloud Error', 'litespeed-cache') . ": [Service] $service [Info] " . __('No available Cloud Node.', 'litespeed-cache');
			Admin_Display::error($msg);
			return false;
		}

		self::debug('Closest nodes list', $valid_clouds);

		// Check server load
		if (in_array($service, self::$SERVICES_LOAD_CHECK)) {
			$valid_cloud_loads = array();
			foreach ($valid_clouds as $k => $v) {
				$response = wp_remote_get($v, array('timeout' => 5, 'sslverify' => true));
				if (is_wp_error($response)) {
					$error_message = $response->get_error_message();
					self::debug('failed to do load checker: ' . $error_message);
					continue;
				}

				$curr_load = \json_decode($response['body'], true);
				if (!empty($curr_load['_res']) && $curr_load['_res'] == 'ok' && isset($curr_load['load'])) {
					$valid_cloud_loads[$v] = $curr_load['load'];
				}
			}

			if (!$valid_cloud_loads) {
				$msg = __('Cloud Error', 'litespeed-cache') . ": [Service] $service [Info] " . __('No available Cloud Node after checked server load.', 'litespeed-cache');
				Admin_Display::error($msg);
				return false;
			}

			self::debug('Closest nodes list after load check', $valid_cloud_loads);

			$qualified_list = array_keys($valid_cloud_loads, min($valid_cloud_loads));
		} else {
			$qualified_list = $valid_clouds;
		}

		$closest = $qualified_list[array_rand($qualified_list)];

		self::debug('Chose node: ' . $closest);

		// store data into option locally
		$this->_summary['server.' . $service] = $closest;
		$this->_summary['server_date.' . $service] = time();
		self::save_summary();

		return $this->_summary['server.' . $service];
	}

	/**
	 * May need to convert to queue service
	 */
	private function _maybe_queue($service)
	{
		if (in_array($service, self::$_QUEUE_SVC_SET)) {
			return self::SVC_QUEUE;
		}
		return $service;
	}

	/**
	 * Get data from QUIC cloud server
	 *
	 * @since  3.0
	 * @access public
	 */
	public static function get($service, $data = array())
	{
		$instance = self::cls();
		return $instance->_get($service, $data);
	}

	/**
	 * Get data from QUIC cloud server
	 *
	 * @since  3.0
	 * @access private
	 */
	private function _get($service, $data = false)
	{
		$service_tag = $service;
		if (!empty($data['action'])) {
			$service_tag .= '-' . $data['action'];
		}

		if (!$this->_maybe_cloud($service_tag)) {
			return;
		}

		$server = $this->detect_cloud($service);
		if (!$server) {
			return;
		}

		$url = $server . '/' . $service;

		$param = array(
			'site_url' => home_url(),
			'domain_key' => $this->_api_key(),
			'main_domain' => !empty($this->_summary['main_domain']) ? $this->_summary['main_domain'] : '',
			'ver' => Core::VER,
		);

		if ($data) {
			$param['data'] = $data;
		}

		$url .= '?' . http_build_query($param);

		self::debug('getting from : ' . $url);

		self::save_summary(array('curr_request.' . $service_tag => time()));

		$response = wp_remote_get($url, array('timeout' => 15, 'sslverify' => true));

		return $this->_parse_response($response, $service, $service_tag, $server);
	}

	/**
	 * Check if is able to do cloud request or not
	 *
	 * @since  3.0
	 * @access private
	 */
	private function _maybe_cloud($service_tag)
	{
		$home_url = home_url();
		if (!wp_http_validate_url($home_url)) {
			self::debug('wp_http_validate_url failed: ' . $home_url);
			return false;
		}

		// Deny if is IP
		if (preg_match('#^(([1-9]?\d|1\d\d|25[0-5]|2[0-4]\d)\.){3}([1-9]?\d|1\d\d|25[0-5]|2[0-4]\d)$#', Utility::parse_url_safe($home_url, PHP_URL_HOST))) {
			self::debug('IP home url is not allowed for cloud service.');
			$msg = __('In order to use QC services, need a real domain name, cannot use an IP.', 'litespeed-cache');
			Admin_Display::error($msg);
			return false;
		}

		/** @since 5.0 If in valid err_domains, bypass request */
		if ($this->_is_err_domain($home_url)) {
			self::debug('home url is in err_domains, bypass request: ' . $home_url);
			return false;
		}

		// we don't want the `img_optm-taken` to fail at any given time
		if ($service_tag == self::IMGOPTM_TAKEN) {
			return true;
		}

		if ($service_tag == self::SVC_D_SYNC_CONF && $this->_setup_token && !$this->_api_key()) {
			self::debug('Skip sync conf if API key is not available yet.');
			return false;
		}

		$expiration_req = self::EXPIRATION_REQ;
		// Limit frequent unfinished request to 5min
		$timestamp_tag = 'curr_request.';
		if ($service_tag == self::SVC_IMG_OPTM . '-' . Img_Optm::TYPE_NEW_REQ) {
			$timestamp_tag = 'last_request.';
			if ($this->has_pkg(self::SVC_IMG_OPTM, self::BM_IMG_OPTM_PRIO)) {
				$expiration_req /= 10;
			}
		} else {
			// For all other requests, if is under debug mode, will always allow
			if ($this->conf(self::O_DEBUG) && $this->_api_key()) {
				return true;
			}
		}

		if (!empty($this->_summary[$timestamp_tag . $service_tag])) {
			$expired = $this->_summary[$timestamp_tag . $service_tag] + $expiration_req - time();
			if ($expired > 0) {
				self::debug("❌ try [$service_tag] after $expired seconds");

				if ($service_tag !== self::API_VER) {
					$msg =
						__('Cloud Error', 'litespeed-cache') .
						': ' .
						sprintf(__('Please try after %1$s for service %2$s.', 'litespeed-cache'), Utility::readable_time($expired, 0, true), '<code>' . $service_tag . '</code>');
					Admin_Display::error(array('cloud_trylater' => $msg));
				}

				return false;
			}
		}

		if (in_array($service_tag, self::$_PUB_SVC_SET)) {
			return true;
		}

		if (!$this->_api_key()) {
			Admin_Display::error(Error::msg('lack_of_api_key'));
			return false;
		}

		return true;
	}

	/**
	 * Post data to QUIC.cloud server
	 *
	 * @since  3.0
	 * @access public
	 */
	public static function post($service, $data = false, $time_out = false)
	{
		$instance = self::cls();
		return $instance->_post($service, $data, $time_out);
	}

	/**
	 * Post data to cloud server
	 *
	 * @since  3.0
	 * @access private
	 */
	private function _post($service, $data = false, $time_out = false)
	{
		$service_tag = $service;
		if (!empty($data['action'])) {
			$service_tag .= '-' . $data['action'];
		}

		if (!$this->_maybe_cloud($service_tag)) {
			return;
		}

		$server = $this->detect_cloud($service);
		if (!$server) {
			return;
		}

		$url = $server . '/' . $this->_maybe_queue($service);

		self::debug('posting to : ' . $url);

		if ($data) {
			$data['service_type'] = $service; // For queue distribution usage
		}

		$param = array(
			'site_url' => home_url(),
			'domain_key' => $this->_api_key(),
			'main_domain' => !empty($this->_summary['main_domain']) ? $this->_summary['main_domain'] : '',
			'ver' => Core::VER,
			'data' => $data,
		);

		self::save_summary(array('curr_request.' . $service_tag => time()));

		$response = wp_remote_post($url, array('body' => $param, 'timeout' => $time_out ?: 15, 'sslverify' => true));

		return $this->_parse_response($response, $service, $service_tag, $server);
	}

	/**
	 * Parse response JSON
	 * Mark the request successful if the response status is ok
	 *
	 * @since  3.0
	 */
	private function _parse_response($response, $service, $service_tag, $server)
	{
		if (is_wp_error($response)) {
			$error_message = $response->get_error_message();
			self::debug('failed to request: ' . $error_message);

			if ($service !== self::API_VER && $service !== self::API_NEWS) {
				$msg = __('Failed to request via WordPress', 'litespeed-cache') . ': ' . $error_message . " [server] $server [service] $service";
				Admin_Display::error($msg);

				// Tmp disabled this node from reusing in 1 day
				if (empty($this->_summary['disabled_node'])) {
					$this->_summary['disabled_node'] = array();
				}
				$this->_summary['disabled_node'][$server] = time();
				self::save_summary();

				// Force redetect node
				self::debug('Node error, redetecting node [svc] ' . $service);
				$this->detect_cloud($service, true);
			}
			return;
		}

		$json = \json_decode($response['body'], true);

		if (!is_array($json)) {
			self::debug('failed to decode response json: ' . $response['body']);

			if ($service !== self::API_VER && $service !== self::API_NEWS) {
				$msg = __('Failed to request via WordPress', 'litespeed-cache') . ': ' . $response['body'] . " [server] $server [service] $service";
				Admin_Display::error($msg);

				// Tmp disabled this node from reusing in 1 day
				if (empty($this->_summary['disabled_node'])) {
					$this->_summary['disabled_node'] = array();
				}
				$this->_summary['disabled_node'][$server] = time();
				self::save_summary();

				// Force redetect node
				self::debug('Node error, redetecting node [svc] ' . $service);
				$this->detect_cloud($service, true);
			}

			return;
		}

		if (!empty($json['_code'])) {
			self::debug('Hit err _code: ' . $json['_code']);
			if ($json['_code'] == 'unpulled_images') {
				$msg = __('Cloud server refused the current request due to unpulled images. Please pull the images first.', 'litespeed-cache');
				Admin_Display::error($msg);
				return;
			}
			if ($json['_code'] == 'blocklisted') {
				$msg = __('Your domain_key has been temporarily blocklisted to prevent abuse. You may contact support at QUIC.cloud to learn more.', 'litespeed-cache');
				Admin_Display::error($msg);
				return;
			}

			if ($json['_code'] == 'rate_limit') {
				self::debug('Cloud server rate limit exceeded.');
				$msg = __('Cloud server refused the current request due to rate limiting. Please try again later.', 'litespeed-cache');
				Admin_Display::error($msg);
				return;
			}

			if ($json['_code'] == 'heavy_load' || $json['_code'] == 'redetect_node') {
				// Force redetect node
				self::debug('Node redetecting node [svc] ' . $service);
				Admin_Display::info(__('Redetected node', 'litespeed-cache') . ': ' . Error::msg($json['_code']));
				$this->detect_cloud($service, true);
			}
		}

		if (!empty($json['_503'])) {
			self::debug('service 503 unavailable temporarily. ' . $json['_503']);

			$msg = __(
				'We are working hard to improve your online service experience. The service will be unavailable while we work. We apologize for any inconvenience.',
				'litespeed-cache'
			);
			$msg .= ' ' . $json['_503'] . " [server] $server [service] $service";
			Admin_Display::error($msg);

			// Force redetect node
			self::debug('Node error, redetecting node [svc] ' . $service);
			$this->detect_cloud($service, true);

			return;
		}

		list($json, $return) = $this->extract_msg($json, $service, $server);
		if ($return) {
			return;
		}

		self::save_summary(array(
			'last_request.' . $service_tag => $this->_summary['curr_request.' . $service_tag],
			'curr_request.' . $service_tag => 0,
		));

		if ($json) {
			self::debug2('response ok', $json);
		} else {
			self::debug2('response ok');
		}

		// Only successful request return Array
		return $json;
	}

	/**
	 * Extract msg from json
	 * @since 5.0
	 */
	public function extract_msg($json, $service, $server = false, $is_callback = false)
	{
		if (!empty($json['_info'])) {
			self::debug('_info: ' . $json['_info']);
			$msg = __('Message from QUIC.cloud server', 'litespeed-cache') . ': ' . $json['_info'];
			$msg .= $this->_parse_link($json);
			Admin_Display::info($msg);
			unset($json['_info']);
		}

		if (!empty($json['_note'])) {
			self::debug('_note: ' . $json['_note']);
			$msg = __('Message from QUIC.cloud server', 'litespeed-cache') . ': ' . $json['_note'];
			$msg .= $this->_parse_link($json);
			Admin_Display::note($msg);
			unset($json['_note']);
		}

		if (!empty($json['_success'])) {
			self::debug('_success: ' . $json['_success']);
			$msg = __('Good news from QUIC.cloud server', 'litespeed-cache') . ': ' . $json['_success'];
			$msg .= $this->_parse_link($json);
			Admin_Display::succeed($msg);
			unset($json['_success']);
		}

		// Upgrade is required
		if (!empty($json['_err_req_v'])) {
			self::debug('_err_req_v: ' . $json['_err_req_v']);
			$msg =
				sprintf(__('%1$s plugin version %2$s required for this action.', 'litespeed-cache'), Core::NAME, 'v' . $json['_err_req_v'] . '+') .
				" [server] $server [service] $service";

			// Append upgrade link
			$msg2 = ' ' . GUI::plugin_upgrade_link(Core::NAME, Core::PLUGIN_NAME, $json['_err_req_v']);

			$msg2 .= $this->_parse_link($json);
			Admin_Display::error($msg . $msg2);
			return array($json, true);
		}

		// Parse _carry_on info
		if (!empty($json['_carry_on'])) {
			self::debug('Carry_on usage', $json['_carry_on']);
			// Store generic info
			foreach (array('usage', 'promo', 'partner', '_error', '_info', '_note', '_success') as $v) {
				if (isset($json['_carry_on'][$v])) {
					switch ($v) {
						case 'usage':
							$usage_svc_tag = in_array($service, array(self::SVC_CCSS, self::SVC_UCSS, self::SVC_VPI)) ? self::SVC_PAGE_OPTM : $service;
							$this->_summary['usage.' . $usage_svc_tag] = $json['_carry_on'][$v];
							break;

						case 'promo':
							if (empty($this->_summary[$v]) || !is_array($this->_summary[$v])) {
								$this->_summary[$v] = array();
							}
							$this->_summary[$v][] = $json['_carry_on'][$v];
							break;

						case 'partner':
							$this->_summary[$v] = $json['_carry_on'][$v];
							break;

						case '_error':
						case '_info':
						case '_note':
						case '_success':
							$color_mode = substr($v, 1);
							$msgs = $json['_carry_on'][$v];
							Admin_Display::add_unique_notice($color_mode, $msgs, true);
							break;

						default:
							break;
					}
				}
			}
			self::save_summary();
			unset($json['_carry_on']);
		}

		// Parse general error msg
		if (!$is_callback && (empty($json['_res']) || $json['_res'] !== 'ok')) {
			$json_msg = !empty($json['_msg']) ? $json['_msg'] : 'unknown';
			self::debug('❌ _err: ' . $json_msg, $json);

			$str_translated = Error::msg($json_msg);
			$msg = __('Failed to communicate with QUIC.cloud server', 'litespeed-cache') . ': ' . $str_translated . " [server] $server [service] $service";
			$msg .= $this->_parse_link($json);
			Admin_Display::error($msg);

			// QC may try auto alias
			/** @since 5.0 Store the domain as `err_domains` only for QC auto alias feature */
			if ($json_msg == 'err_alias') {
				if (empty($this->_summary['err_domains'])) {
					$this->_summary['err_domains'] = array();
				}
				$home_url = home_url();
				if (!array_key_exists($home_url, $this->_summary['err_domains'])) {
					$this->_summary['err_domains'][$home_url] = time();
				}
				self::save_summary();
			}

			// Site not on QC, delete invalid domain key
			if ($json_msg == 'site_not_registered' || $json_msg == 'err_key') {
				$this->_clean_api_key();
			}

			return array($json, true);
		}

		unset($json['_res']);
		if (!empty($json['_msg'])) {
			unset($json['_msg']);
		}

		return array($json, false);
	}

	/**
	 * Clear API key and QC linked status
	 * @since 5.0
	 */
	private function _clean_api_key()
	{
		$this->cls('Conf')->update_confs(array(self::O_API_KEY => ''));
		$this->_summary['is_linked'] = 0;
		self::save_summary();

		$msg = __('Site not recognized. Domain Key has been automatically removed. Please request a new one.', 'litespeed-cache');
		$msg .= Doc::learn_more(admin_url('admin.php?page=litespeed-general'), __('Click here to set.', 'litespeed-cache'), true, false, true);
		$msg .= Doc::learn_more('https://docs.litespeedtech.com/lscache/lscwp/general/#domain-key', false, false, false, true);
		Admin_Display::error($msg, false, true);
	}

	/**
	 * REST call: check if the error domain is valid call for auto alias purpose
	 * @since 5.0
	 */
	public function rest_err_domains()
	{
		// Validate token hash first
		if (empty($_POST['hash']) || empty($_POST['main_domain']) || empty($_POST['alias'])) {
			return self::err('lack_of_param');
		}

		if (!$this->_api_key() || $_POST['hash'] !== md5(substr($this->_api_key(), 1, 8))) {
			return self::err('wrong_hash');
		}

		list($post_data) = $this->extract_msg($_POST, 'Quic.cloud', false, true);

		if ($this->_is_err_domain($_POST['alias'])) {
			if ($_POST['alias'] == home_url()) {
				$this->_remove_domain_from_err_list($_POST['alias']);
			}

			$res_hash = substr($this->_api_key(), 2, 4);

			self::debug('__callback IP request hash: md5(' . $res_hash . ')');

			return self::ok(array('hash' => md5($res_hash)));
		}

		return self::err('Not an alias req from here');
	}

	/**
	 * Remove a domain from err domain
	 * @since 5.0
	 */
	private function _remove_domain_from_err_list($url)
	{
		unset($this->_summary['err_domains'][$url]);
		self::save_summary();
	}

	/**
	 * Check if is err domain
	 * @since 5.0
	 */
	private function _is_err_domain($home_url)
	{
		if (empty($this->_summary['err_domains'])) {
			return false;
		}
		if (!array_key_exists($home_url, $this->_summary['err_domains'])) {
			return false;
		}
		// Auto delete if too long ago
		if (time() - $this->_summary['err_domains'][$home_url] > 86400 * 10) {
			$this->_remove_domain_from_err_list($home_url);
		}
		if (time() - $this->_summary['err_domains'][$home_url] > 86400) {
			return false;
		}
		return true;
	}

	public function req_rest_api($api, $body = array())
	{
		$token = $this->_setup_token;

		if (empty($token)) {
			Admin_Display::error(__('Cannot request REST API, no token saved.', 'litespeed-cache'));
			return;
		}
		$req_args = array(
			'headers' => array(
				'Authorization' => 'bearer ' . $token,
				'Content-Type' => 'application/json',
			),
		);
		self::debug('Req rest api to QC [api] ' . $api);
		if (!empty($body)) {
			$req_args['body'] = \json_encode($body);

			$response = wp_remote_post(self::CLOUD_SERVER . '/v2' . $api, $req_args);
		} else {
			$response = wp_remote_get(self::CLOUD_SERVER . '/v2' . $api, $req_args);
		}

		return $this->_parse_rest_response($response);
	}

	private function _parse_rest_response($response)
	{
		if (is_wp_error($response)) {
			$error_message = $response->get_error_message();
			self::debug('failed to request REST API: ' . $error_message);
			Admin_Display::error(__('Cloud REST Error', 'litespeed-cache') . ': ' . $error_message);
			return $error_message;
		} elseif (wp_remote_retrieve_response_code($response) == '401') {
			Admin_Display::error(__('Unauthorized access to REST API. Your token has expired.', 'litespeed-cache'));
			return 'unauthorized access to REST API.';
		}

		$json = \json_decode($response['body'], true);
		self::debug('QC response', $json);

		if (!$json['success']) {
			$contactSupport = false;
			if (isset($json['info']['errors'])) {
				$errs = array();
				foreach ($json['info']['errors'] as $err) {
					$errs[] = 'Error ' . $err['code'] . ': ' . $err['message'];
					if ($err['code'] == 1113) {
						$contactSupport = true;
					}
				}
				$error_message = implode('<br>', $errs);
			} else {
				$error_message = __('Unknown error.', 'litespeed-cache');
				$contactSupport = true;
			}
			if ($contactSupport) {
				$error_message .= ' <a href="https://www.quic.cloud/support/" target="_blank">' . __('Contact QUIC.cloud support', 'litespeed-cache') . '</a>';
			}
			Admin_Display::error(__('Cloud REST API returned error: ', 'litespeed-cache') . $error_message);
			return $error_message;
		}

		return $json;
	}

	/**
	 * Show promo from cloud
	 *
	 * @since  3.0
	 * @access public
	 */
	public function show_promo()
	{
		// if ( ! $this->_api_key() && ! defined( 'LITESPEED_DISMISS_DOMAIN_KEY' ) ) {
		// 	Admin_Display::error( Error::msg( 'lack_of_api_key' ), true );
		// }

		if (empty($this->_summary['promo'])) {
			return;
		}

		require_once LSCWP_DIR . 'tpl/banner/cloud_promo.tpl.php';
	}

	/**
	 * Clear promo from cloud
	 *
	 * @since  3.0
	 * @access private
	 */
	private function _clear_promo()
	{
		if (count($this->_summary['promo']) > 1) {
			array_shift($this->_summary['promo']);
		} else {
			$this->_summary['promo'] = array();
		}
		self::save_summary();
	}

	/**
	 * Parse _links from json
	 *
	 * @since  1.6.5
	 * @since  1.6.7 Self clean the parameter
	 * @access private
	 */
	private function _parse_link(&$json)
	{
		$msg = '';

		if (!empty($json['_links'])) {
			foreach ($json['_links'] as $v) {
				$msg .= ' ' . sprintf('<a href="%s" class="%s" target="_blank">%s</a>', $v['link'], !empty($v['cls']) ? $v['cls'] : '', $v['title']);
			}

			unset($json['_links']);
		}

		return $msg;
	}

	/**
	 * Request callback validation from Cloud
	 *
	 * @since  3.0
	 * @access public
	 */
	public function ip_validate()
	{
		if (empty($_POST['hash'])) {
			self::debug('Lack of hash param');
			return self::err('lack_of_param');
		}

		// Note: Using empty here throws a fatal error in PHP v5.3
		if (!$this->_api_key()) {
			self::debug('Lack of API key');
			return self::err('lack_of_api_key');
		}

		$to_validate = substr($this->_api_key(), 0, 4);
		if ($_POST['hash'] !== md5($to_validate)) {
			self::debug('__callback IP request hash wrong: md5(' . $to_validate . ') !== ' . $_POST['hash']);
			return self::err('err_hash');
		}

		Control::set_nocache('Cloud IP hash validation');

		$res_hash = substr($this->_api_key(), 2, 4);

		self::debug('__callback IP request hash: md5(' . $res_hash . ')');

		return self::ok(array('hash' => md5($res_hash)));
	}

	/**
	 * Can apply for a new token or not
	 *
	 * @since 3.0
	 */
	public function can_token()
	{
		return empty($this->_summary['token_ts']) || time() - $this->_summary['token_ts'] > self::EXPIRATION_TOKEN;
	}

	public function set_keygen_token($token)
	{
		$this->_summary['token'] = $token;
		$this->_summary['token_ts'] = time();
		if (!empty($this->_summary['apikey_ts'])) {
			unset($this->_summary['apikey_ts']);
		}
		self::save_summary();
	}

	/**
	 * Send request for domain key, get json [ 'token' => 'asdfasdf' ]
	 *
	 * @since  3.0
	 * @access public
	 */
	public function gen_key()
	{
		$data = array(
			'site_url' => home_url(),
			'rest' => function_exists('rest_get_url_prefix') ? rest_get_url_prefix() : apply_filters('rest_url_prefix', 'wp-json'),
			'server_ip' => $this->conf(self::O_SERVER_IP),
		);
		if (!empty($this->_summary['token'])) {
			$data['token'] = $this->_summary['token'];
		}

		$response = wp_remote_get(self::CLOUD_SERVER . '/d/req_key?data=' . Utility::arr2str($data));
		if (is_wp_error($response)) {
			$error_message = $response->get_error_message();
			self::debug('failed to gen_key: ' . $error_message);
			Admin_Display::error(__('Cloud Error', 'litespeed-cache') . ': ' . $error_message);
			return;
		}

		$json = \json_decode($response['body'], true);

		// Save token option
		if (!empty($json['token'])) {
			$this->set_keygen_token($json['token']);
		}

		// Parse general error msg
		if (empty($json['_res']) || $json['_res'] !== 'ok') {
			// clear current token
			unset($this->_summary['token']);
			self::save_summary();

			$json_msg = !empty($json['_msg']) ? $json['_msg'] : 'unknown';
			self::debug('❌ _err: ' . $json_msg);

			$msg = __('Failed to communicate with QUIC.cloud server', 'litespeed-cache') . ': ' . Error::msg($json_msg);
			$msg .= $this->_parse_link($json);
			Admin_Display::error($msg);

			return;
		}

		// This is a ok msg
		if (!empty($json['_msg'])) {
			self::debug('_msg: ' . $json['_msg']);

			$msg = __('Message from QUIC.cloud server', 'litespeed-cache') . ': ' . Error::msg($json['_msg']);
			$msg .= $this->_parse_link($json);
			Admin_Display::info($msg);
			return;
		}

		self::debug('✅ send request for key successfully.');

		Admin_Display::succeed(__('Applied for Domain Key successfully. Please wait for result. Domain Key will be automatically sent to your WordPress.', 'litespeed-cache'));
	}

	/**
	 * Token callback validation from Cloud
	 *
	 * @since  3.0
	 * @access public
	 */
	public function token_validate()
	{
		try {
			$this->validate_hash();
		} catch (\Exception $e) {
			return self::err($e->getMessage());
		}

		Control::set_nocache('Cloud token validation');

		self::debug('✅ __callback token validation passed');

		return self::ok(array('hash' => md5(substr($this->_summary['token'], 3, 8))));
	}

	/**
	 * Callback for approval of api key after validated token and gen key from QUIC.cloud
	 *
	 * @since  3.0
	 * @access public
	 */
	public function save_apikey()
	{
		// Validate token hash first
		if (empty($_POST['domain_key']) || !isset($_POST['is_linked'])) {
			return self::err('lack_of_param');
		}

		try {
			$this->validate_hash(1);
		} catch (\Exception $e) {
			return self::err($e->getMessage());
		}

		// This doesn't need to sync QUIC conf but need to clear nodes
		$this->cls('Conf')->update_confs(array(self::O_API_KEY => $_POST['domain_key']));

		$this->_summary['is_linked'] = $_POST['is_linked'] ? 1 : 0;
		$this->_summary['apikey_ts'] = time();
		if (!empty($_POST['main_domain'])) {
			$this->_summary['main_domain'] = $_POST['main_domain'];
		}
		// Clear token
		unset($this->_summary['token']);
		self::save_summary();

		self::debug('✅ saved auth_key');
		Admin_Display::succeed('🎊 ' . __('Congratulations, your Domain Key has been approved! The setting has been updated accordingly.', 'litespeed-cache'));

		return self::ok();
	}

	/**
	 * Validate POST hash match local token or not
	 *
	 * @since  3.0
	 */
	public function validate_hash($offset = 0)
	{
		if (empty($_POST['hash'])) {
			self::debug('Lack of hash param');
			throw new \Exception('lack_of_param');
		}

		if (empty($this->_summary['token'])) {
			self::debug('token validate failed: token not exist');
			throw new \Exception('lack_of_local_token');
		}

		if ($_POST['hash'] !== md5(substr($this->_summary['token'], $offset, 8))) {
			self::debug('token validate failed: token mismatch hash !== ' . $_POST['hash']);
			throw new \Exception('mismatch');
		}
	}

	/**
	 * If can link the domain to QC user or not
	 *
	 * @since  3.0
	 */
	public function can_link_qc()
	{
		return empty($this->_summary['is_linked']) && $this->_api_key();
	}

	/**
	 * Link the domain to QC user
	 *
	 * @since  3.0
	 */
	private function _link_to_qc()
	{
		if (!$this->can_link_qc()) {
			return;
		}

		$data = array(
			'site_url' => home_url(),
			'domain_hash' => md5(substr($this->_api_key(), 0, 8)),
			'ref' => get_admin_url(null, 'admin.php?page=litespeed-general'),
		);

		wp_redirect(self::CLOUD_SERVER_DASH . '/u/wp?data=' . Utility::arr2str($data));
		exit();
	}

	public function qc_link()
	{
		$data = array(
			'site_url' => home_url(),
			'domain_hash' => md5(substr($this->_api_key(), 0, 8)),
			'ver' => LSCWP_V,
		);
		return self::CLOUD_SERVER_DASH . '/u/wp?data=' . Utility::arr2str($data); // . (!empty($this->_summary['is_linked']) ? '?wplogin=1' : '');
	}

	public function set_linked()
	{
		$this->_summary['is_linked'] = 1;
		self::save_summary();

		# Force resync qc conf
		$this->cls('CDN\Quic')->try_sync_conf(true);
	}

	/**
	 * Update is_linked status if is a redirected back from QC
	 *
	 * @since  3.0
	 * @since  5.0 renamed update_is_linked_status -> parse_qc_redir, add param for additional args. Return args if exist.
	 */
	public function parse_qc_redir($check_token = false)
	{
		if (!$this->_api_key() && !empty($this->_summary['is_linked'])) {
			$this->_summary['is_linked'] = 0;
			self::save_summary();
		}

		if (empty($_GET['qc_res'])) {
			return false;
		}

		if ($_GET['qc_res'] == 'registered') {
			if (!empty($_GET['qc_new'])) {
				Admin_Display::succeed(__('QUIC.cloud account has been created and successfully linked.', 'litespeed-cache'), true);
			} else {
				Admin_Display::succeed(__('QUIC.cloud account has been successfully linked.', 'litespeed-cache'), true);
			}
		}

		$qsDrop = array();
		$qsDrop[] = ".replace( '&qc_res=" . sanitize_key($_GET['qc_res']) . ', \'\' )';

		if (!empty($_GET['domain_hash'])) {
			if (empty($_GET['domain_hash_nonce'])) {
				Admin_Display::error(__('Domain Key hash nonce missing.', 'litespeed-cache'), true);
				return false;
			}
			$salt = substr($this->_api_key(), 3, 8);
			$tick = ceil(time() / 43200);
			$nonce = md5($salt . $tick);
			$nonce2 = md5($salt . ($tick - 1));
			if ($_GET['domain_hash_nonce'] != $nonce && $_GET['domain_hash_nonce'] != $nonce2) {
				Admin_Display::error(__('Domain Key hash nonce mismatch. Please correct your server clock.', 'litespeed-cache'), true);
				return false;
			}

			if (md5(substr($this->_api_key(), 2, 8)) !== $_GET['domain_hash']) {
				Admin_Display::error(__('Domain Key hash mismatch', 'litespeed-cache'), true);
				return false;
			}

			$this->set_linked();
			$qsDrop[] = ".replace( '&domain_hash=" . sanitize_key($_GET['domain_hash']) . ', \'\' )';
		}

		$token = '';
		if ($check_token && !empty($_GET['token'])) {
			// Validate nonce `litespeed_qc_link`
			if (empty($_GET['nonce']) || !wp_verify_nonce($_GET['nonce'], 'litespeed_qc_link')) {
				Admin_Display::error(__('Failed to verify domain nonce.', 'litespeed-cache'), true);
				return false;
			}

			$token = preg_replace('/[^0-9a-zA-Z]/', '', $_GET['token']);
			$qsDrop[] = ".replace( '&token=" . urlencode($_GET['token']) . ', \'\' )';
		}

		$replaceStr = implode('', $qsDrop);

		// Drop QS
		echo "<script>window.history.pushState( 'remove_gen_link', document.title, window.location.href" . $replaceStr . ' );</script>';
		return $token;
	}

	/**
	 * Check if this visit is from cloud or not
	 *
	 * @since  3.0
	 */
	public function is_from_cloud()
	{
		$check_point = time() - 86400 * self::TTL_IPS;
		if (empty($this->_summary['ips']) || empty($this->_summary['ips_ts']) || $this->_summary['ips_ts'] < $check_point) {
			self::debug('Force updating ip as ips_ts is older than ' . self::TTL_IPS . ' days');
			$this->_update_ips();
		}

		$res = $this->cls('Router')->ip_access($this->_summary['ips']);
		if (!$res) {
			self::debug('❌ Not our cloud IP');

			// Auto check ip list again but need an interval limit safety.
			if (empty($this->_summary['ips_ts_runner']) || time() - $this->_summary['ips_ts_runner'] > 600) {
				self::debug('Force updating ip as ips_ts_runner is older than 10mins');
				// Refresh IP list for future detection
				$this->_update_ips();
				$res = $this->cls('Router')->ip_access($this->_summary['ips']);
				if (!$res) {
					self::debug('❌ 2nd time: Not our cloud IP');
				} else {
					self::debug('✅ Passed Cloud IP verification');
				}
				return $res;
			}
		} else {
			self::debug('✅ Passed Cloud IP verification');
		}

		return $res;
	}

	/**
	 * Update Cloud IP list
	 *
	 * @since 4.2
	 */
	private function _update_ips()
	{
		self::debug('Load remote Cloud IP list from ' . self::CLOUD_IPS);
		// Prevent multiple call in a short period
		self::save_summary(array('ips_ts' => time(), 'ips_ts_runner' => time()));

		$response = wp_remote_get(self::CLOUD_IPS . '?json');
		if (is_wp_error($response)) {
			$error_message = $response->get_error_message();
			self::debug('failed to get ip whitelist: ' . $error_message);
			throw new \Exception('Failed to fetch QUIC.cloud whitelist ' . $error_message);
		}

		$json = \json_decode($response['body'], true);

		self::debug('Load ips', $json);
		self::save_summary(array('ips' => $json));
	}

	/**
	 * Return succeeded response
	 *
	 * @since  3.0
	 */
	public static function ok($data = array())
	{
		$data['_res'] = 'ok';
		return $data;
	}

	/**
	 * Return error
	 *
	 * @since  3.0
	 */
	public static function err($code)
	{
		return array('_res' => 'err', '_msg' => $code);
	}

	/**
	 * Return pong for ping to check PHP function availability
	 * @since 6.5
	 */
	public function ping()
	{
		$resp = array(
			'v_lscwp' => Core::VER,
			'v_php' => PHP_VERSION,
			'v_wp' => $GLOBALS['wp_version'],
		);
		if (!empty($_POST['funcs'])) {
			foreach ($_POST['funcs'] as $v) {
				$resp[$v] = function_exists($v) ? 'y' : 'n';
			}
		}
		if (!empty($_POST['classes'])) {
			foreach ($_POST['classes'] as $v) {
				$resp[$v] = class_exists($v) ? 'y' : 'n';
			}
		}
		if (!empty($_POST['consts'])) {
			foreach ($_POST['consts'] as $v) {
				$resp[$v] = defined($v) ? 'y' : 'n';
			}
		}
		return self::ok($resp);
	}

	/**
	 * Handle all request actions from main cls
	 *
	 * @since  3.0
	 * @access public
	 */
	public function handler()
	{
		$type = Router::verify_type();

		switch ($type) {
			case self::TYPE_CLEAR_CLOUD:
				$this->clear_cloud();
				break;

			case self::TYPE_REDETECT_CLOUD:
				if (!empty($_GET['svc'])) {
					$this->detect_cloud($_GET['svc'], true);
				}
				break;

			case self::TYPE_CLEAR_PROMO:
				$this->_clear_promo();
				break;

			case self::TYPE_GEN_KEY:
				$this->gen_key();
				break;

			case self::TYPE_LINK:
				$this->_link_to_qc();
				break;

			case self::TYPE_SYNC_USAGE:
				$this->sync_usage();

				$msg = __('Sync credit allowance with Cloud Server successfully.', 'litespeed-cache');
				Admin_Display::succeed($msg);
				break;

			default:
				break;
		}

		Admin::redirect();
	}
}