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Editing: helpers.php

<?php

/**
 * Helpers functions
 * @author Webcraftic <wordpress.webraftic@gmail.com>
 * @copyright (c) 2017 Webraftic Ltd
 * @version 1.0
 */

// Exit if accessed directly
if( !defined('ABSPATH') ) {
	exit;
}

class WCL_Helper {

public static function array_merge_insert(array $arr, array $inserted, $position = 'bottom', $key = null)
	{
		return WbcrFactoryClearfy240_Helpers::arrayMergeInsert($arr, $inserted, $position, $key);
	}

/**
	 * Flushes as many page cache plugin's caches as possible.
	 */
	public static function flush_cache()
	{
		// Flush cache for all cache plugins
		WbcrFactoryClearfy240_Helpers::flushPageCache();
	}

/**
	 * Should show a page about the plugin or not.
	 *
	 * @return bool
	 */
	public static function is_need_show_setup_page()
	{
		$need_show_about = (int)get_option(WCL_Plugin::app()->getOptionName('setup_wizard'));

$is_ajax = self::doing_ajax();
		$is_cron = self::doing_cron();
		$is_rest = self::doing_rest_api();

if( $need_show_about && !$is_ajax && !$is_cron && !$is_rest ) {
			return true;
		}

return false;
	}

/**
	 * Checks if the current request is a WP REST API request.
	 *
	 * Case #1: After WP_REST_Request initialisation
	 * Case #2: Support "plain" permalink settings
	 * Case #3: URL Path begins with wp-json/ (your REST prefix)
	 *          Also supports WP installations in subfolders
	 *
	 * @author matzeeable https://wordpress.stackexchange.com/questions/221202/does-something-like-is-rest-exist
	 * @since  2.1.0
	 * @return boolean
	 */
	public static function doing_rest_api()
	{
		$prefix = rest_get_url_prefix();
		$rest_route = WCL_Plugin::app()->request->get('rest_route', null);
		if( defined('REST_REQUEST') && REST_REQUEST // (#1)
			|| !is_null($rest_route) // (#2)
			&& strpos(trim($rest_route, '\\/'), $prefix, 0) === 0 ) {
			return true;
		}

// (#3)
		$rest_url = wp_parse_url(site_url($prefix));
		$current_url = wp_parse_url(add_query_arg([]));

return strpos($current_url['path'], $rest_url['path'], 0) === 0;
	}

/**
	 * @return bool
	 * @since 2.1.0
	 */
	public static function doing_ajax()
	{
		if( function_exists('wp_doing_ajax') ) {
			return wp_doing_ajax();
		}

return defined('DOING_AJAX') && DOING_AJAX;
	}

/**
	 * @return bool
	 * @since 2.1.0
	 */
	public static function doing_cron()
	{
		if( function_exists('wp_doing_cron') ) {
			return wp_doing_cron();
		}

return defined('DOING_CRON') && DOING_CRON;
	}

/**
	 * Allows you to get the base path to the plugin in the directory wp-content/plugins/
	 *
	 * @param $slug - slug for example "clearfy", "hide-login-page"
	 * @return int|null|string - "clearfy/clearfy.php"
	 */
	public static function getPluginBasePathBySlug($slug)
	{
		// Check if the function get_plugins() is registered. It is necessary for the front-end
		// usually get_plugins() only works in the admin panel.
		if( !function_exists('get_plugins') ) {
			require_once ABSPATH . 'wp-admin/includes/plugin.php';
		}

$plugins = get_plugins();

foreach($plugins as $base_path => $plugin) {
			if( strpos($base_path, rtrim(trim($slug))) !== false ) {
				return $base_path;
			}
		}

return null;
	}

/**
	 * Static method will check whether the plugin is activated or not. You can check whether the plugin exists
	 * by using its slug or the base path.
	 *
	 * @param string $slug - slug for example "clearfy", "hide-login-page" or base path "clearfy/clearfy.php"
	 * @return bool
	 */
	public static function isPluginActivated($slug)
	{
		if( strpos(rtrim(trim($slug)), '/') === false ) {
			$plugin_base_path = self::getPluginBasePathBySlug($slug);

if( empty($plugin_base_path) ) {
				return false;
			}
		} else {
			$plugin_base_path = $slug;
		}

require_once ABSPATH . '/wp-admin/includes/plugin.php';

return is_plugin_active($plugin_base_path);
	}

/**
	 * Static method will check whether the plugin is installed or not. You can check whether the plugin exists
	 * by using its slug or the base path.
	 *
	 * @param string $slug - slug "clearfy" or base_path "clearfy/clearfy.php"
	 * @return bool
	 */
	public static function isPluginInstalled($slug)
	{
		if( strpos(rtrim(trim($slug)), '/') === false ) {
			$plugin_base_path = self::getPluginBasePathBySlug($slug);

if( !empty($plugin_base_path) ) {
				return true;
			}
		} else {

// Check if the function get_plugins() is registered. It is necessary for the front-end
			// usually get_plugins() only works in the admin panel.
			if( !function_exists('get_plugins') ) {
				require_once ABSPATH . 'wp-admin/includes/plugin.php';
			}

$plugins = get_plugins();

if( isset($plugins[$slug]) ) {
				return true;
			}
		}

return false;
	}

/**
	 * Is permalink enabled?
	 * @return bool
	 * @since 1.0.0
	 * @global WP_Rewrite $wp_rewrite
	 */
	public static function isPermalink()
	{
		global $wp_rewrite;

if( !isset($wp_rewrite) || !is_object($wp_rewrite) || !$wp_rewrite->using_permalinks() ) {
			return false;
		}

return true;
	}

/**
	 * Получает и возвращает все опции разрешенные для экспорта
	 *
	 * @param string $return
	 * @return array|string
	 */
	public static function getExportOptions($return = 'json')
	{
		global $wpdb;

$export_options = array();

$options = WCL_Option::getAllOptions();

$allow_export_options = array();

foreach((array)$options as $option_class) {
			$option_name = $option_class->getName();
			$allow_export_options[] = WCL_Plugin::app()->getOptionName($option_name);
		}

if( WCL_Plugin::app()->isNetworkActive() ) {
			$network_id = get_current_network_id();

$request = $wpdb->get_results($wpdb->prepare("
					SELECT meta_key, meta_value
					FROM {$wpdb->sitemeta}
					WHERE site_id = '%d' AND meta_key
					LIKE '%s'", $network_id, WCL_Plugin::app()->getPrefix() . "%"));
		} else {
			$request = $wpdb->get_results($wpdb->prepare("
					SELECT option_name, option_value
					FROM {$wpdb->options}
					WHERE option_name
					LIKE '%s'", WCL_Plugin::app()->getPrefix() . "_%"));
		}

if( !empty($request) && !empty($allow_export_options) ) {
			foreach($request as $option) {
				if( WCL_Plugin::app()->isNetworkActive() ) {
					$option_name = $option->meta_key;
					$option_value = $option->meta_value;
				} else {
					$option_name = $option->option_name;
					$option_value = $option->option_value;
				}
				if( in_array($option_name, $allow_export_options) ) {
					$export_options[$option_name] = $option_value;
				}
			}
		}

if( $return == 'array' ) {
			return $export_options;
		}

return WCL_Helper::getEscapeJson($export_options);
	}

/**
	 * Try to get variable from JSON-encoded post variable
	 *
	 * Note: we pass some params via json-encoded variables, as via pure post some data (ex empty array) will be absent
	 *
	 * @param string $name $_POST's variable name
	 *
	 * @return array
	 */
	public static function maybeGetPostJson($name)
	{
		if( isset($_POST[$name]) and is_string($_POST[$name]) ) {
			$result = json_decode(stripslashes($_POST[$name]), true);
			if( !is_array($result) ) {
				$result = array();
			}

return $result;
		} else {
			return array();
		}
	}

/**
	 * Escape json data
	 * @param array $data
	 * @return string escaped json string
	 */
	public static function getEscapeJson(array $data)
	{
		return htmlspecialchars(json_encode($data), ENT_QUOTES, 'UTF-8');
	}

/**
	 * Componate content for robot.txt
	 * @return string
	 */
	public static function getRightRobotTxt()
	{
		$cache_output = WCL_Plugin::app()->getPopulateOption('robots_txt_text_cache');

if( $cache_output ) {
			return $cache_output;
		}

$site_url = get_home_url();
		$dir_host = preg_replace("(^https?://)", "", $site_url);

if( is_ssl() ) {
			$dir_host = 'https://' . $dir_host;
		}

$file_path = WCL_PLUGIN_DIR . '/templates/robots.txt';
		$file = fopen($file_path, 'r');
		$robot_default_content = fread($file, filesize($file_path));
		fclose($file);

$output = $robot_default_content;
		$output .= 'Host: ' . $dir_host . PHP_EOL;

$headers = @get_headers($site_url . '/sitemap.xml', 1);

if( strpos($headers[0], '200 OK') !== false ) {
			$output .= 'Sitemap: ' . $site_url . '/sitemap.xml' . PHP_EOL;
		} else if( isset($headers['Location']) && !empty($headers['Location']) ) {
			$output .= 'Sitemap: ' . $headers['Location'] . PHP_EOL;
		}

WCL_Plugin::app()->updatePopulateOption('robots_txt_text_cache', $output);

return $output;
	}

public static function fetch_google_page_speed_audit()
	{
		$site_url = get_home_url();

// Check if plugin is installed in localhost
		if( substr($_SERVER['REMOTE_ADDR'], 0, 4) == '127.' || $_SERVER['REMOTE_ADDR'] == '::1' ) {
			$site_url = 'https://cm-wp.com/';
		}

$results = [];
		$strategy_arr = array(1 => 'desktop', 2 => 'mobile');

foreach($strategy_arr as $strategy_id => $strategy_text) {
			$google_page_speed_call = "https://www.googleapis.com/pagespeedonline/v5/runPagespeed?url=" . $site_url . "&key=AIzaSyD85-8Tmp_Ixc43AgqyeLpNZNlGP150LbA&strategy=" . $strategy_text;

//Fetch data from Google PageSpeed API
			$response = wp_remote_get($google_page_speed_call, array('timeout' => 30));
			$response_code = wp_remote_retrieve_response_code($response);
			$response_error = null;
			if( is_wp_error($response) ) {
				$response_error = $response->get_error_message();
			} elseif( 200 !== $response_code ) {
				$response_error = new WP_Error('api-error', /* translators: %d: Numeric HTTP status code, e.g. 400, 403, 500, 504, etc. */ sprintf(__('Invalid API response code (%d).'), $response_code));
			}

$google_ps = json_decode(wp_remote_retrieve_body($response), true);

if( isset($google_ps['error']) ) {
				wp_send_json_error([
					'error' => $google_ps['error']['message'],
					'code' => $google_ps['error']['code']
				]);
			}

if( is_wp_error($response_error) ) {
				wp_send_json_error([
					'error' => $response_error->get_error_message(),
					'code' => $response_error->get_error_code()
				]);
			}

$results[$strategy_text] = [
				'performance_score' => ($google_ps['lighthouseResult']['categories']['performance']['score'] * 100),
				'first_contentful_paint' => $google_ps['lighthouseResult']['audits']['first-contentful-paint']['displayValue'],
				'speed_index' => $google_ps['lighthouseResult']['audits']['speed-index']['displayValue'],
				'interactive' => $google_ps['lighthouseResult']['audits']['interactive']['displayValue']
			];
		}

return $results;
	}
}

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