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Current File : /usr/src/litespeed-wp-plugin/6.5.3/litespeed-cache/src/vpi.cls.php
<?php

/**
 * The viewport image class.
 *
 * @since      	4.7
 */

namespace LiteSpeed;

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

class VPI extends Base
{
	const LOG_TAG = '[VPI]';

	const TYPE_GEN = 'gen';
	const TYPE_CLEAR_Q = 'clear_q';

	protected $_summary;
	private $_queue;

	/**
	 * Init
	 *
	 * @since  4.7
	 */
	public function __construct()
	{
		$this->_summary = self::get_summary();
	}

	/**
	 * The VPI content of the current page
	 *
	 * @since  4.7
	 */
	public function add_to_queue()
	{
		$is_mobile = $this->_separate_mobile();

		global $wp;
		$request_url = home_url($wp->request);

		$ua = !empty($_SERVER['HTTP_USER_AGENT']) ? $_SERVER['HTTP_USER_AGENT'] : '';

		// Store it to prepare for cron
		$this->_queue = $this->load_queue('vpi');

		if (count($this->_queue) > 500) {
			self::debug('Queue is full - 500');
			return;
		}

		$home_id = get_option('page_for_posts');

		if (!is_singular() && !($home_id > 0 && is_home())) {
			self::debug('not single post ID');
			return;
		}

		$post_id = is_home() ? $home_id : get_the_ID();

		$queue_k = ($is_mobile ? 'mobile' : '') . ' ' . $request_url;
		if (!empty($this->_queue[$queue_k])) {
			self::debug('queue k existed ' . $queue_k);
			return;
		}

		$this->_queue[$queue_k] = array(
			'url' => apply_filters('litespeed_vpi_url', $request_url),
			'post_id' => $post_id,
			'user_agent' => substr($ua, 0, 200),
			'is_mobile' => $this->_separate_mobile(),
		); // Current UA will be used to request
		$this->save_queue('vpi', $this->_queue);
		self::debug('Added queue_vpi [url] ' . $queue_k . ' [UA] ' . $ua);

		// Prepare cache tag for later purge
		Tag::add('VPI.' . md5($queue_k));

		return null;
	}

	/**
	 * Notify finished from server
	 * @since 4.7
	 */
	public function notify()
	{
		$post_data = \json_decode(file_get_contents('php://input'), true);
		if (is_null($post_data)) {
			$post_data = $_POST;
		}
		self::debug('notify() data', $post_data);

		$this->_queue = $this->load_queue('vpi');

		// Validate key
		if (empty($post_data['domain_key']) || $post_data['domain_key'] !== md5($this->conf(self::O_API_KEY))) {
			self::debug('❌ notify wrong key');
			self::save_summary(array('notify_ts_err' => time()));
			return Cloud::err('wrong_key');
		}

		list($post_data) = $this->cls('Cloud')->extract_msg($post_data, 'vpi');

		$notified_data = $post_data['data'];
		if (empty($notified_data) || !is_array($notified_data)) {
			self::debug('❌ notify exit: no notified data');
			return Cloud::err('no notified data');
		}

		// Check if its in queue or not
		$valid_i = 0;
		foreach ($notified_data as $v) {
			if (empty($v['request_url'])) {
				self::debug('❌ notify bypass: no request_url', $v);
				continue;
			}
			if (empty($v['queue_k'])) {
				self::debug('❌ notify bypass: no queue_k', $v);
				continue;
			}
			// $queue_k = ( $is_mobile ? 'mobile' : '' ) . ' ' . $v[ 'request_url' ];
			$queue_k = $v['queue_k'];

			if (empty($this->_queue[$queue_k])) {
				self::debug('❌ notify bypass: no this queue [q_k]' . $queue_k);
				continue;
			}

			// Save data
			if (!empty($v['data_vpi'])) {
				$post_id = $this->_queue[$queue_k]['post_id'];
				$name = !empty($v['is_mobile']) ? 'litespeed_vpi_list_mobile' : 'litespeed_vpi_list';
				$urldecode = is_array($v['data_vpi']) ? array_map('urldecode', $v['data_vpi']) : urldecode($v['data_vpi']);
				self::debug('save data_vpi', $urldecode);
				$this->cls('Metabox')->save($post_id, $name, $urldecode);

				$valid_i++;
			}

			unset($this->_queue[$queue_k]);
			self::debug('notify data handled, unset queue [q_k] ' . $queue_k);
		}
		$this->save_queue('vpi', $this->_queue);

		self::debug('notified');

		return Cloud::ok(array('count' => $valid_i));
	}

	/**
	 * Cron
	 *
	 * @since  4.7
	 */
	public static function cron($continue = false)
	{
		$_instance = self::cls();
		return $_instance->_cron_handler($continue);
	}

	/**
	 * Cron generation
	 *
	 * @since  4.7
	 */
	private function _cron_handler($continue = false)
	{
		self::debug('cron start');
		$this->_queue = $this->load_queue('vpi');

		if (empty($this->_queue)) {
			return;
		}

		// For cron, need to check request interval too
		if (!$continue) {
			if (!empty($this->_summary['curr_request_vpi']) && time() - $this->_summary['curr_request_vpi'] < 300 && !$this->conf(self::O_DEBUG)) {
				self::debug('Last request not done');
				return;
			}
		}

		$i = 0;
		foreach ($this->_queue as $k => $v) {
			if (!empty($v['_status'])) {
				continue;
			}

			self::debug('cron job [tag] ' . $k . ' [url] ' . $v['url'] . ($v['is_mobile'] ? ' 📱 ' : '') . ' [UA] ' . $v['user_agent']);

			$i++;
			$res = $this->_send_req($v['url'], $k, $v['user_agent'], $v['is_mobile']);
			if (!$res) {
				// Status is wrong, drop this this->_queue
				$this->_queue = $this->load_queue('vpi');
				unset($this->_queue[$k]);
				$this->save_queue('vpi', $this->_queue);

				if (!$continue) {
					return;
				}

				// if ( $i > 3 ) {
				GUI::print_loading(count($this->_queue), 'VPI');
				return Router::self_redirect(Router::ACTION_VPI, self::TYPE_GEN);
				// }

				continue;
			}

			// Exit queue if out of quota
			if ($res === 'out_of_quota') {
				return;
			}

			$this->_queue = $this->load_queue('vpi');
			$this->_queue[$k]['_status'] = 'requested';
			$this->save_queue('vpi', $this->_queue);
			self::debug('Saved to queue [k] ' . $k);

			// only request first one
			if (!$continue) {
				return;
			}

			// if ( $i > 3 ) {
			GUI::print_loading(count($this->_queue), 'VPI');
			return Router::self_redirect(Router::ACTION_VPI, self::TYPE_GEN);
			// }
		}
	}

	/**
	 * Send to QC API to generate VPI
	 *
	 * @since  4.7
	 * @access private
	 */
	private function _send_req($request_url, $queue_k, $user_agent, $is_mobile)
	{
		$svc = Cloud::SVC_VPI;
		// Check if has credit to push or not
		$err = false;
		$allowance = $this->cls('Cloud')->allowance($svc, $err);
		if (!$allowance) {
			self::debug('❌ No credit: ' . $err);
			$err && Admin_Display::error(Error::msg($err));
			return 'out_of_quota';
		}

		set_time_limit(120);

		// Update css request status
		self::save_summary(array('curr_request_vpi' => time()), true);

		// Gather guest HTML to send
		$html = $this->cls('CSS')->prepare_html($request_url, $user_agent);

		if (!$html) {
			return false;
		}

		// Parse HTML to gather all CSS content before requesting
		$css = false;
		list($css, $html) = $this->cls('CSS')->prepare_css($html);

		if (!$css) {
			self::debug('❌ No css');
			return false;
		}

		$data = array(
			'url' => $request_url,
			'queue_k' => $queue_k,
			'user_agent' => $user_agent,
			'is_mobile' => $is_mobile ? 1 : 0, // todo:compatible w/ tablet
			'html' => $html,
			'css' => $css,
		);
		self::debug('Generating: ', $data);

		$json = Cloud::post($svc, $data, 30);
		if (!is_array($json)) {
			return false;
		}

		// Unknown status, remove this line
		if ($json['status'] != 'queued') {
			return false;
		}

		// Save summary data
		self::reload_summary();
		$this->_summary['last_spent_vpi'] = time() - $this->_summary['curr_request_vpi'];
		$this->_summary['last_request_vpi'] = $this->_summary['curr_request_vpi'];
		$this->_summary['curr_request_vpi'] = 0;
		self::save_summary();

		return true;
	}

	/**
	 * Handle all request actions from main cls
	 *
	 * @since  4.7
	 */
	public function handler()
	{
		$type = Router::verify_type();

		switch ($type) {
			case self::TYPE_GEN:
				self::cron(true);
				break;

			case self::TYPE_CLEAR_Q:
				$this->clear_q('vpi');
				break;

			default:
				break;
		}

		Admin::redirect();
	}
}

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