<?php
/**
 * Geolocation class
 *
 * Handles geolocation and updating the geolocation database.
 *
 * This product includes GeoLite data created by MaxMind, available from http://www.maxmind.com.
 *
 * @package WooCommerce/Classes
 * @version 3.4.0
 */

defined( 'ABSPATH' ) || exit;

/**
 * WC_Geolocation Class.
 */
class WC_Geolocation {

	/**
	 * GeoLite IPv4 DB.
	 *
	 * @deprecated 3.4.0
	 */
	const GEOLITE_DB = 'http://geolite.maxmind.com/download/geoip/database/GeoLiteCountry/GeoIP.dat.gz';

	/**
	 * GeoLite IPv6 DB.
	 *
	 * @deprecated 3.4.0
	 */
	const GEOLITE_IPV6_DB = 'http://geolite.maxmind.com/download/geoip/database/GeoIPv6.dat.gz';

	/**
	 * GeoLite2 DB.
	 *
	 * @since 3.4.0
	 */
	const GEOLITE2_DB = 'http://geolite.maxmind.com/download/geoip/database/GeoLite2-Country.tar.gz';

	/**
	 * API endpoints for looking up user IP address.
	 *
	 * @var array
	 */
	private static $ip_lookup_apis = array(
		'ipify'             => 'http://api.ipify.org/',
		'ipecho'            => 'http://ipecho.net/plain',
		'ident'             => 'http://ident.me',
		'whatismyipaddress' => 'http://bot.whatismyipaddress.com',
	);

	/**
	 * API endpoints for geolocating an IP address
	 *
	 * @var array
	 */
	private static $geoip_apis = array(
		'ipinfo.io'  => 'https://ipinfo.io/%s/json',
		'ip-api.com' => 'http://ip-api.com/json/%s',
	);

	/**
	 * Check if server supports MaxMind GeoLite2 Reader.
	 *
	 * @since 3.4.0
	 * @return bool
	 */
	private static function supports_geolite2() {
		return version_compare( PHP_VERSION, '5.4.0', '>=' );
	}

	/**
	 * Check if geolocation is enabled.
	 *
	 * @since 3.4.0
	 * @param string $current_settings Current geolocation settings.
	 * @return bool
	 */
	private static function is_geolocation_enabled( $current_settings ) {
		return in_array( $current_settings, array( 'geolocation', 'geolocation_ajax' ), true );
	}

	/**
	 * Prevent geolocation via MaxMind when using legacy versions of php.
	 *
	 * @since 3.4.0
	 * @param string $default_customer_address current value.
	 * @return string
	 */
	public static function disable_geolocation_on_legacy_php( $default_customer_address ) {
		if ( self::is_geolocation_enabled( $default_customer_address ) ) {
			$default_customer_address = 'base';
		}

		return $default_customer_address;
	}

	/**
	 * Hook in geolocation functionality.
	 */
	public static function init() {
		if ( self::supports_geolite2() ) {
			// Only download the database from MaxMind if the geolocation function is enabled, or a plugin specifically requests it.
			if ( self::is_geolocation_enabled( get_option( 'woocommerce_default_customer_address' ) ) || apply_filters( 'woocommerce_geolocation_update_database_periodically', false ) ) {
				add_action( 'woocommerce_geoip_updater', array( __CLASS__, 'update_database' ) );
			}

			// Trigger database update when settings are changed to enable geolocation.
			add_filter( 'pre_update_option_woocommerce_default_customer_address', array( __CLASS__, 'maybe_update_database' ), 10, 2 );
		} else {
			add_filter( 'pre_option_woocommerce_default_customer_address', array( __CLASS__, 'disable_geolocation_on_legacy_php' ) );
		}
	}

	/**
	 * Maybe trigger a DB update for the first time.
	 *
	 * @param  string $new_value New value.
	 * @param  string $old_value Old value.
	 * @return string
	 */
	public static function maybe_update_database( $new_value, $old_value ) {
		if ( $new_value !== $old_value && self::is_geolocation_enabled( $new_value ) ) {
			self::update_database();
		}

		return $new_value;
	}

	/**
	 * Get current user IP Address.
	 *
	 * @return string
	 */
	public static function get_ip_address() {
		if ( isset( $_SERVER['HTTP_X_REAL_IP'] ) ) { // WPCS: input var ok, CSRF ok.
			return sanitize_text_field( wp_unslash( $_SERVER['HTTP_X_REAL_IP'] ) );  // WPCS: input var ok, CSRF ok.
		} elseif ( isset( $_SERVER['HTTP_X_FORWARDED_FOR'] ) ) { // WPCS: input var ok, CSRF ok.
			// Proxy servers can send through this header like this: X-Forwarded-For: client1, proxy1, proxy2
			// Make sure we always only send through the first IP in the list which should always be the client IP.
			return (string) rest_is_ip_address( trim( current( preg_split( '/,/', sanitize_text_field( wp_unslash( $_SERVER['HTTP_X_FORWARDED_FOR'] ) ) ) ) ) ); // WPCS: input var ok, CSRF ok.
		} elseif ( isset( $_SERVER['REMOTE_ADDR'] ) ) { // @codingStandardsIgnoreLine
			return sanitize_text_field( wp_unslash( $_SERVER['REMOTE_ADDR'] ) ); // @codingStandardsIgnoreLine
		}
		return '';
	}

	/**
	 * Get user IP Address using an external service.
	 * This can be used as a fallback for users on localhost where
	 * get_ip_address() will be a local IP and non-geolocatable.
	 *
	 * @return string
	 */
	public static function get_external_ip_address() {
		$external_ip_address = '0.0.0.0';

		if ( '' !== self::get_ip_address() ) {
			$transient_name      = 'external_ip_address_' . self::get_ip_address();
			$external_ip_address = get_transient( $transient_name );
		}

		if ( false === $external_ip_address ) {
			$external_ip_address     = '0.0.0.0';
			$ip_lookup_services      = apply_filters( 'woocommerce_geolocation_ip_lookup_apis', self::$ip_lookup_apis );
			$ip_lookup_services_keys = array_keys( $ip_lookup_services );
			shuffle( $ip_lookup_services_keys );

			foreach ( $ip_lookup_services_keys as $service_name ) {
				$service_endpoint = $ip_lookup_services[ $service_name ];
				$response         = wp_safe_remote_get( $service_endpoint, array( 'timeout' => 2 ) );

				if ( ! is_wp_error( $response ) && rest_is_ip_address( $response['body'] ) ) {
					$external_ip_address = apply_filters( 'woocommerce_geolocation_ip_lookup_api_response', wc_clean( $response['body'] ), $service_name );
					break;
				}
			}

			set_transient( $transient_name, $external_ip_address, WEEK_IN_SECONDS );
		}

		return $external_ip_address;
	}

	/**
	 * Geolocate an IP address.
	 *
	 * @param  string $ip_address   IP Address.
	 * @param  bool   $fallback     If true, fallbacks to alternative IP detection (can be slower).
	 * @param  bool   $api_fallback If true, uses geolocation APIs if the database file doesn't exist (can be slower).
	 * @return array
	 */
	public static function geolocate_ip( $ip_address = '', $fallback = false, $api_fallback = true ) {
		// Filter to allow custom geolocation of the IP address.
		$country_code = apply_filters( 'woocommerce_geolocate_ip', false, $ip_address, $fallback, $api_fallback );

		if ( false === $country_code ) {
			// If GEOIP is enabled in CloudFlare, we can use that (Settings -> CloudFlare Settings -> Settings Overview).
			if ( ! empty( $_SERVER['HTTP_CF_IPCOUNTRY'] ) ) { // WPCS: input var ok, CSRF ok.
				$country_code = strtoupper( sanitize_text_field( wp_unslash( $_SERVER['HTTP_CF_IPCOUNTRY'] ) ) ); // WPCS: input var ok, CSRF ok.
			} elseif ( ! empty( $_SERVER['GEOIP_COUNTRY_CODE'] ) ) { // WPCS: input var ok, CSRF ok.
				// WP.com VIP has a variable available.
				$country_code = strtoupper( sanitize_text_field( wp_unslash( $_SERVER['GEOIP_COUNTRY_CODE'] ) ) ); // WPCS: input var ok, CSRF ok.
			} elseif ( ! empty( $_SERVER['HTTP_X_COUNTRY_CODE'] ) ) { // WPCS: input var ok, CSRF ok.
				// VIP Go has a variable available also.
				$country_code = strtoupper( sanitize_text_field( wp_unslash( $_SERVER['HTTP_X_COUNTRY_CODE'] ) ) ); // WPCS: input var ok, CSRF ok.
			} else {
				$ip_address = $ip_address ? $ip_address : self::get_ip_address();
				$database   = self::get_local_database_path();

				if ( self::supports_geolite2() && file_exists( $database ) ) {
					$country_code = self::geolocate_via_db( $ip_address, $database );
				} elseif ( $api_fallback ) {
					$country_code = self::geolocate_via_api( $ip_address );
				} else {
					$country_code = '';
				}

				if ( ! $country_code && $fallback ) {
					// May be a local environment - find external IP.
					return self::geolocate_ip( self::get_external_ip_address(), false, $api_fallback );
				}
			}
		}

		return array(
			'country' => $country_code,
			'state'   => '',
		);
	}

	/**
	 * Path to our local db.
	 *
	 * @param  string $deprecated Deprecated since 3.4.0.
	 * @return string
	 */
	public static function get_local_database_path( $deprecated = '2' ) {
		return apply_filters( 'woocommerce_geolocation_local_database_path', WP_CONTENT_DIR . '/uploads/GeoLite2-Country.mmdb', $deprecated );
	}

	/**
	 * Update geoip database.
	 *
	 * Extract files with PharData. Tool built into PHP since 5.3.
	 */
	public static function update_database() {
		$logger = wc_get_logger();

		if ( ! self::supports_geolite2() ) {
			$logger->notice( 'Requires PHP 5.4 to be able to download MaxMind GeoLite2 database', array( 'source' => 'geolocation' ) );
			return;
		}

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

		$database             = 'GeoLite2-Country.mmdb';
		$target_database_path = self::get_local_database_path();
		$tmp_database_path    = download_url( self::GEOLITE2_DB );

		if ( ! is_wp_error( $tmp_database_path ) ) {
			WP_Filesystem();

			global $wp_filesystem;

			try {
				// Make sure target dir exists.
				$wp_filesystem->mkdir( dirname( $target_database_path ) );

				// Extract files with PharData. Tool built into PHP since 5.3.
				$file      = new PharData( $tmp_database_path ); // phpcs:ignore PHPCompatibility.Classes.NewClasses.phardataFound
				$file_path = trailingslashit( $file->current()->getFileName() ) . $database;
				$file->extractTo( dirname( $tmp_database_path ), $file_path, true );

				// Move file and delete temp.
				$wp_filesystem->move( trailingslashit( dirname( $tmp_database_path ) ) . $file_path, $target_database_path, true );
				$wp_filesystem->delete( trailingslashit( dirname( $tmp_database_path ) ) . $file->current()->getFileName() );
			} catch ( Exception $e ) {
				$logger->notice( $e->getMessage(), array( 'source' => 'geolocation' ) );

				// Reschedule download of DB.
				wp_clear_scheduled_hook( 'woocommerce_geoip_updater' );
				wp_schedule_event( strtotime( 'first tuesday of next month' ), 'monthly', 'woocommerce_geoip_updater' );
			}
			// Delete temp file regardless of success.
			$wp_filesystem->delete( $tmp_database_path );
		} else {
			$logger->notice(
				'Unable to download GeoIP Database: ' . $tmp_database_path->get_error_message(),
				array( 'source' => 'geolocation' )
			);
		}
	}

	/**
	 * Use MAXMIND GeoLite database to geolocation the user.
	 *
	 * @param  string $ip_address IP address.
	 * @param  string $database   Database path.
	 * @return string
	 */
	private static function geolocate_via_db( $ip_address, $database ) {
		if ( ! class_exists( 'WC_Geolite_Integration', false ) ) {
			require_once WC_ABSPATH . 'includes/class-wc-geolite-integration.php';
		}

		$geolite = new WC_Geolite_Integration( $database );

		return $geolite->get_country_iso( $ip_address );
	}

	/**
	 * Use APIs to Geolocate the user.
	 *
	 * Geolocation APIs can be added through the use of the woocommerce_geolocation_geoip_apis filter.
	 * Provide a name=>value pair for service-slug=>endpoint.
	 *
	 * If APIs are defined, one will be chosen at random to fulfil the request. After completing, the result
	 * will be cached in a transient.
	 *
	 * @param  string $ip_address IP address.
	 * @return string
	 */
	private static function geolocate_via_api( $ip_address ) {
		$country_code = get_transient( 'geoip_' . $ip_address );

		if ( false === $country_code ) {
			$geoip_services = apply_filters( 'woocommerce_geolocation_geoip_apis', self::$geoip_apis );

			if ( empty( $geoip_services ) ) {
				return '';
			}

			$geoip_services_keys = array_keys( $geoip_services );

			shuffle( $geoip_services_keys );

			foreach ( $geoip_services_keys as $service_name ) {
				$service_endpoint = $geoip_services[ $service_name ];
				$response         = wp_safe_remote_get( sprintf( $service_endpoint, $ip_address ), array( 'timeout' => 2 ) );

				if ( ! is_wp_error( $response ) && $response['body'] ) {
					switch ( $service_name ) {
						case 'ipinfo.io':
							$data         = json_decode( $response['body'] );
							$country_code = isset( $data->country ) ? $data->country : '';
							break;
						case 'ip-api.com':
							$data         = json_decode( $response['body'] );
							$country_code = isset( $data->countryCode ) ? $data->countryCode : ''; // @codingStandardsIgnoreLine
							break;
						default:
							$country_code = apply_filters( 'woocommerce_geolocation_geoip_response_' . $service_name, '', $response['body'] );
							break;
					}

					$country_code = sanitize_text_field( strtoupper( $country_code ) );

					if ( $country_code ) {
						break;
					}
				}
			}

			set_transient( 'geoip_' . $ip_address, $country_code, WEEK_IN_SECONDS );
		}

		return $country_code;
	}
}

WC_Geolocation::init();
