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<?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 3.9.0
 */

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
	 * @deprecated 3.9.0
	 */
	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',
		'tnedi'  => 'http://tnedi.me',
	);

/**
	 * 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 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 );
	}

/**
	 * Get current user IP Address.
	 *
	 * @return string
	 */
	public static function get_ip_address() {
		if ( isset( $_SERVER['HTTP_X_REAL_IP'] ) ) {
			return sanitize_text_field( wp_unslash( $_SERVER['HTTP_X_REAL_IP'] ) );
		} elseif ( isset( $_SERVER['HTTP_X_FORWARDED_FOR'] ) ) {
			// 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.
			$value = trim( current( preg_split( '/,/', sanitize_text_field( wp_unslash( $_SERVER['HTTP_X_FORWARDED_FOR'] ) ) ) ) );
			// Account for the '<IPv4 address>:<port>', '[<IPv6>]' and '[<IPv6>]:<port>' cases, removing the port.
			// The regular expression is oversimplified on purpose, later 'rest_is_ip_address' will do the actual IP address validation.
			$value = preg_replace( '/([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+)\:.*|\[([^]]+)\].*/', '$1$2', $value );
			return (string) rest_is_ip_address( $value );
		} elseif ( isset( $_SERVER['REMOTE_ADDR'] ) ) {
			// Make sure we always only send through the first IP in the list which should always be the client IP.
			$value = trim( current( preg_split( '/,/', sanitize_text_field( wp_unslash( $_SERVER['REMOTE_ADDR'] ) ) ) ) );
			return (string) rest_is_ip_address( $value );
		}
		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,
						'user-agent' => 'WooCommerce/' . wc()->version,
					)
				);

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, DAY_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.
		 *
		 * @since 3.9.0
		 * @param string $geolocation Country code.
		 * @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 string
		 */
		$country_code = apply_filters( 'woocommerce_geolocate_ip', false, $ip_address, $fallback, $api_fallback );

if ( false !== $country_code ) {
			return array(
				'country'  => $country_code,
				'state'    => '',
				'city'     => '',
				'postcode' => '',
			);
		}

if ( empty( $ip_address ) ) {
			$ip_address   = self::get_ip_address();
			$country_code = self::get_country_code_from_headers();
		}

/**
		 * Get geolocation filter.
		 *
		 * @since 3.9.0
		 * @param array  $geolocation Geolocation data, including country, state, city, and postcode.
		 * @param string $ip_address  IP Address.
		 */
		$geolocation = apply_filters(
			'woocommerce_get_geolocation',
			array(
				'country'  => $country_code,
				'state'    => '',
				'city'     => '',
				'postcode' => '',
			),
			$ip_address
		);

// If we still haven't found a country code, let's consider doing an API lookup.
		if ( '' === $geolocation['country'] && $api_fallback ) {
			$geolocation['country'] = self::geolocate_via_api( $ip_address );
		}

// It's possible that we're in a local environment, in which case the geolocation needs to be done from the
		// external address.
		if ( '' === $geolocation['country'] && $fallback ) {
			$external_ip_address = self::get_external_ip_address();

// Only bother with this if the external IP differs.
			if ( '0.0.0.0' !== $external_ip_address && $external_ip_address !== $ip_address ) {
				return self::geolocate_ip( $external_ip_address, false, $api_fallback );
			}
		}

return array(
			'country'  => $geolocation['country'],
			'state'    => $geolocation['state'],
			'city'     => $geolocation['city'],
			'postcode' => $geolocation['postcode'],
		);
	}

/**
	 * Path to our local db.
	 *
	 * @deprecated 3.9.0
	 * @param  string $deprecated Deprecated since 3.4.0.
	 * @return string
	 */
	public static function get_local_database_path( $deprecated = '2' ) {
		wc_deprecated_function( 'WC_Geolocation::get_local_database_path', '3.9.0' );
		$integration = wc()->integrations->get_integration( 'maxmind_geolocation' );
		return $integration->get_database_service()->get_database_path();
	}

/**
	 * Update geoip database.
	 *
	 * @deprecated 3.9.0
	 * Extract files with PharData. Tool built into PHP since 5.3.
	 */
	public static function update_database() {
		wc_deprecated_function( 'WC_Geolocation::update_database', '3.9.0' );
		$integration = wc()->integrations->get_integration( 'maxmind_geolocation' );
		$integration->update_database();
	}

/**
	 * Fetches the country code from the request headers, if one is available.
	 *
	 * @since 3.9.0
	 * @return string The country code pulled from the headers, or empty string if one was not found.
	 */
	private static function get_country_code_from_headers() {
		$country_code = '';

$headers = array(
			'MM_COUNTRY_CODE',
			'GEOIP_COUNTRY_CODE',
			'HTTP_CF_IPCOUNTRY',
			'HTTP_X_COUNTRY_CODE',
		);

foreach ( $headers as $header ) {
			if ( empty( $_SERVER[ $header ] ) ) {
				continue;
			}

$country_code = strtoupper( sanitize_text_field( wp_unslash( $_SERVER[ $header ] ) ) );
			break;
		}

return $country_code;
	}

/**
	 * 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,
						'user-agent' => 'WooCommerce/' . wc()->version,
					)
				);

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, DAY_IN_SECONDS );
		}

return $country_code;
	}

/**
	 * Hook in geolocation functionality.
	 *
	 * @deprecated 3.9.0
	 * @return null
	 */
	public static function init() {
		wc_deprecated_function( 'WC_Geolocation::init', '3.9.0' );
		return null;
	}

/**
	 * Prevent geolocation via MaxMind when using legacy versions of php.
	 *
	 * @deprecated 3.9.0
	 * @since 3.4.0
	 * @param string $default_customer_address current value.
	 * @return string
	 */
	public static function disable_geolocation_on_legacy_php( $default_customer_address ) {
		wc_deprecated_function( 'WC_Geolocation::disable_geolocation_on_legacy_php', '3.9.0' );

if ( self::is_geolocation_enabled( $default_customer_address ) ) {
			$default_customer_address = 'base';
		}

return $default_customer_address;
	}

/**
	 * Maybe trigger a DB update for the first time.
	 *
	 * @deprecated 3.9.0
	 * @param  string $new_value New value.
	 * @param  string $old_value Old value.
	 * @return string
	 */
	public static function maybe_update_database( $new_value, $old_value ) {
		wc_deprecated_function( 'WC_Geolocation::maybe_update_database', '3.9.0' );
		if ( $new_value !== $old_value && self::is_geolocation_enabled( $new_value ) ) {
			self::update_database();
		}

return $new_value;
	}
}

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