<?php

namespace WPMailSMTP\UsageTracking;

use WPMailSMTP\Admin\DomainChecker;
use WPMailSMTP\Admin\SetupWizard;
use WPMailSMTP\Conflicts;
use WPMailSMTP\Debug;
use WPMailSMTP\Helpers\Helpers;
use WPMailSMTP\OptimizedEmailSending;
use WPMailSMTP\Options;
use WPMailSMTP\WP;

/**
 * Usage Tracker functionality to understand what's going on on client's sites.
 *
 * @since 2.3.0
 */
class UsageTracking {

	/**
	 * The slug that will be used to save the option of Usage Tracker.
	 *
	 * @since 2.3.0
	 */
	const SETTINGS_SLUG = 'usage-tracking-enabled';

	/**
	 * Server URL to send failed Setup Wizard data to.
	 *
	 * @since 3.1.0
	 */
	const FAILED_SETUP_WIZARD_DATA_URL = 'https://wpmailsmtpusage.com/v1/smtp-failed-wizard';

	/**
	 * Whether Usage Tracking is enabled.
	 * Needs to check with a fresh copy of options in order to provide accurate results.
	 *
	 * @since 2.3.0
	 *
	 * @return bool
	 */
	public function is_enabled() {

		return (bool) apply_filters(
			'wp_mail_smtp_usage_tracking_is_enabled',
			Options::init()->get( 'general', self::SETTINGS_SLUG )
		);
	}

	/**
	 * Load usage tracking functionality.
	 *
	 * @since 2.3.0
	 */
	public function load() {

		// Check if loading the usage tracking functionality is allowed.
		if ( ! (bool) apply_filters( 'wp_mail_smtp_usage_tracking_load_allowed', true ) ) {
			return;
		}

		// Deregister the action if option is disabled.
		add_action(
			'wp_mail_smtp_options_set_after',
			function () {

				if ( ! $this->is_enabled() ) {
					( new SendUsageTask() )->cancel();
				}
			}
		);

		// Register the action handler only if enabled.
		if ( $this->is_enabled() ) {
			add_filter(
				'wp_mail_smtp_tasks_get_tasks',
				static function ( $tasks ) {
					$tasks[] = SendUsageTask::class;

					return $tasks;
				}
			);
		}
	}

	/**
	 * Get the User Agent string that will be sent to the API.
	 *
	 * @since 2.3.0
	 *
	 * @return string
	 */
	public function get_user_agent() {

		return Helpers::get_default_user_agent();
	}

	/**
	 * Get data for sending to the server.
	 *
	 * @since 2.3.0
	 *
	 * @return array
	 */
	public function get_data() {

		global $wpdb;

		$theme_data         = wp_get_theme();
		$options            = Options::init();
		$mailer             = wp_mail_smtp()->get_providers()->get_mailer(
			$options->get( 'mail', 'mailer' ),
			wp_mail_smtp()->get_processor()->get_phpmailer()
		);
		$setup_wizard_stats = SetupWizard::get_stats();

		$data = array_merge(
			$this->get_required_data(),
			$this->get_additional_data(),
			[
				// Generic data (environment).
				'mysql_version'                            => $wpdb->db_version(),
				'server_version'                           => isset( $_SERVER['SERVER_SOFTWARE'] ) ? sanitize_text_field( wp_unslash( $_SERVER['SERVER_SOFTWARE'] ) ) : '',
				'is_ssl'                                   => is_ssl(),
				'is_multisite'                             => is_multisite(),
				'sites_count'                              => $this->get_sites_total(),
				'theme_name'                               => $theme_data->name,
				'theme_version'                            => $theme_data->version,
				'locale'                                   => get_locale(),
				'timezone_offset'                          => $this->get_timezone_offset(),
				// WP Mail SMTP - specific data.
				'wp_mail_smtp_version'                     => WPMS_PLUGIN_VER,
				'wp_mail_smtp_activated'                   => get_option( 'wp_mail_smtp_activated_time', 0 ),
				'wp_mail_smtp_mailer'                      => $options->get( 'mail', 'mailer' ),
				'wp_mail_smtp_from_email_force'            => (bool) $options->get( 'mail', 'from_email_force' ),
				'wp_mail_smtp_from_name_force'             => (bool) $options->get( 'mail', 'from_name_force' ),
				'wp_mail_smtp_return_path'                 => (bool) $options->get( 'mail', 'return_path' ),
				'wp_mail_smtp_do_not_send'                 => (bool) $options->get( 'general', 'do_not_send' ),
				'wp_mail_smtp_is_white_labeled'            => wp_mail_smtp()->is_white_labeled(),
				'wp_mail_smtp_is_const_enabled'            => (bool) $options->is_const_enabled(),
				'wp_mail_smtp_conflicts_is_detected'       => ( new Conflicts() )->is_detected(),
				'wp_mail_smtp_is_mailer_complete'          => empty( $mailer ) ? false : $mailer->is_mailer_complete(),
				'wp_mail_smtp_setup_wizard_launched_time'  => isset( $setup_wizard_stats['launched_time'] ) ? (int) $setup_wizard_stats['launched_time'] : 0,
				'wp_mail_smtp_setup_wizard_completed_time' => isset( $setup_wizard_stats['completed_time'] ) ? (int) $setup_wizard_stats['completed_time'] : 0,
				'wp_mail_smtp_setup_wizard_completed_successfully' => ! empty( $setup_wizard_stats['was_successful'] ),
				'wp_mail_smtp_source'                      => sanitize_title( get_option( 'wp_mail_smtp_source', '' ) ),
				'wp_mail_smtp_optimize_email_sending'      => (bool) OptimizedEmailSending::is_enabled(),
			]
		);

		if ( 'smtp' === $options->get( 'mail', 'mailer' ) ) {
			$data['wp_mail_smtp_other_smtp_host']       = $options->get( 'smtp', 'host' );
			$data['wp_mail_smtp_other_smtp_encryption'] = $options->get( 'smtp', 'encryption' );
			$data['wp_mail_smtp_other_smtp_port']       = $options->get( 'smtp', 'port' );
			$data['wp_mail_smtp_other_smtp_auth']       = (bool) $options->get( 'smtp', 'auth' );
			$data['wp_mail_smtp_other_smtp_autotls']    = (bool) $options->get( 'smtp', 'autotls' );
		}

		if ( is_multisite() ) {
			$data['wp_mail_smtp_multisite_network_wide'] = WP::use_global_plugin_settings();
		}

		return apply_filters( 'wp_mail_smtp_usage_tracking_get_data', $data );
	}

	/**
	 * Get the required request data.
	 *
	 * @since 3.1.0
	 *
	 * @return array
	 */
	private function get_required_data() {

		return [
			'url'            => home_url(),
			'php_version'    => PHP_MAJOR_VERSION . '.' . PHP_MINOR_VERSION,
			'wp_version'     => get_bloginfo( 'version' ),
			'active_plugins' => $this->get_active_plugins(),
		];
	}

	/**
	 * Get the additional data required by the usage tracking API.
	 *
	 * @since 3.1.0
	 *
	 * @return array
	 */
	private function get_additional_data() {

		$activated_dates = get_option( 'wp_mail_smtp_activated', [] );

		return [
			'wp_mail_smtp_license_key'         => wp_mail_smtp()->get_license_key(),
			'wp_mail_smtp_license_type'        => wp_mail_smtp()->get_license_type(),
			'wp_mail_smtp_is_pro'              => wp_mail_smtp()->is_pro(),
			'wp_mail_smtp_lite_installed_date' => $this->get_installed( $activated_dates, 'lite' ),
			'wp_mail_smtp_pro_installed_date'  => $this->get_installed( $activated_dates, 'pro' ),
		];
	}

	/**
	 * Get timezone offset.
	 * We use `wp_timezone_string()` when it's available (WP 5.3+),
	 * otherwise fallback to the same code, copy-pasted.
	 *
	 * @since 2.3.0
	 *
	 * @return string
	 */
	private function get_timezone_offset() {

		// It was added in WordPress 5.3.
		if ( function_exists( 'wp_timezone_string' ) ) {
			return wp_timezone_string();
		}

		/*
		 * The code below is basically a copy-paste from that function.
		 */

		$timezone_string = get_option( 'timezone_string' );

		if ( $timezone_string ) {
			return $timezone_string;
		}

		$offset  = (float) get_option( 'gmt_offset' );
		$hours   = (int) $offset;
		$minutes = ( $offset - $hours );

		$sign     = ( $offset < 0 ) ? '-' : '+';
		$abs_hour = abs( $hours );
		$abs_mins = abs( $minutes * 60 );

		return sprintf( '%s%02d:%02d', $sign, $abs_hour, $abs_mins );
	}

	/**
	 * Get the list of active plugins.
	 *
	 * @since 2.3.0
	 *
	 * @return array
	 */
	private function get_active_plugins() {

		if ( ! function_exists( 'get_plugins' ) ) {
			include ABSPATH . '/wp-admin/includes/plugin.php';
		}

		$active_plugins = [];

		foreach ( get_mu_plugins() as $path => $plugin ) {
			$active_plugins[ $path ] = isset( $plugin['Version'] ) ? $plugin['Version'] : 'Not Set';
		}

		foreach ( get_plugins() as $path => $plugin ) {
			if ( is_plugin_active( $path ) ) {
				$active_plugins[ $path ] = isset( $plugin['Version'] ) ? $plugin['Version'] : 'Not Set';
			}
		}

		return $active_plugins;
	}

	/**
	 * Installed date.
	 *
	 * @since 2.3.0
	 *
	 * @param array  $activated_dates Input array with dates.
	 * @param string $key             Input key what you want to get.
	 *
	 * @return mixed
	 */
	private function get_installed( $activated_dates, $key ) {

		if ( ! empty( $activated_dates[ $key ] ) ) {
			return $activated_dates[ $key ];
		}

		return false;
	}

	/**
	 * Total number of sites.
	 *
	 * @since 2.3.0
	 *
	 * @return int
	 */
	private function get_sites_total() {

		return function_exists( 'get_blog_count' ) ? (int) get_blog_count() : 1;
	}

	/**
	 * Send failed Setup Wizard usage tracking data, if usage tracking is enabled.
	 *
	 * @since 3.1.0
	 *
	 * @param null|DomainChecker $domain_checker The optional DomainChecker object.
	 */
	public function send_failed_setup_wizard_usage_tracking_data( $domain_checker = null ) {

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

		$options = Options::init();

		$data = array_merge(
			$this->get_required_data(),
			$this->get_additional_data(),
			[
				'wp_mail_smtp_mailer'     => $options->get( 'mail', 'mailer' ),
				'wp_mail_smtp_mail_error' => Debug::get_last(),
			],
			$this->get_domain_checker_results( $domain_checker )
		);

		wp_remote_post(
			self::FAILED_SETUP_WIZARD_DATA_URL,
			[
				'timeout'     => 5,
				'redirection' => 5,
				'httpversion' => '1.1',
				'blocking'    => true,
				'body'        => $data,
				'user-agent'  => $this->get_user_agent(),
			]
		);
	}

	/**
	 * Reformat the domain checker results, so it can be submitted to the usage tracking API.
	 *
	 * @since 3.1.0
	 *
	 * @param DomainChecker|null $domain_checker The Domain Checker object.
	 *
	 * @return array
	 */
	private function get_domain_checker_results( $domain_checker ) {

		if ( ! is_a( $domain_checker, DomainChecker::class ) ) {
			return [];
		}

		$data    = [];
		$results = $domain_checker->get_results();

		$data['wp_mail_smtp_domain_checker_success'] = isset( $results['success'] ) ? (bool) $results['success'] : false;
		$data['wp_mail_smtp_domain_checker_message'] = isset( $results['message'] ) ? $results['message'] : '';

		// Return early if checks are not available.
		if ( empty( $results['checks'] ) || ! is_array( $results['checks'] ) ) {
			return $data;
		}

		foreach ( $results['checks'] as $check ) {
			if ( empty( $check['type'] ) || empty( $check['state'] ) ) {
				continue;
			}

			$data[ 'wp_mail_smtp_domain_checker_check_' . $check['type'] ] = $check['state'];
		}

		return $data;
	}
}

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