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<?php
/**
* @package Freemius
* @copyright Copyright (c) 2015, Freemius, Inc.
* @license https://www.gnu.org/licenses/gpl-3.0.html GNU General Public License Version 3
* @since 1.0.4
*/
if ( ! defined( 'ABSPATH' ) ) {
exit;
}
/**
* Class FS_Api
*
* Wraps Freemius API SDK to handle:
* 1. Clock sync.
* 2. Fallback to HTTP when HTTPS fails.
* 3. Adds caching layer to GET requests.
* 4. Adds consistency for failed requests by using last cached version.
*/
class FS_Api {
/**
* @var FS_Api[]
*/
private static $_instances = array();
/**
* @var FS_Option_Manager Freemius options, options-manager.
*/
private static $_options;
/**
* @var FS_Cache_Manager API Caching layer
*/
private static $_cache;
/**
* @var int Clock diff in seconds between current server to API server.
*/
private static $_clock_diff;
/**
* @var Freemius_Api_WordPress
*/
private $_api;
/**
* @var string
*/
private $_slug;
/**
* @var FS_Logger
* @since 1.0.4
*/
private $_logger;
/**
* @author Leo Fajardo (@leorw)
* @since 2.3.0
*
* @var string
*/
private $_sdk_version;
/**
* @param string $slug
* @param string $scope 'app', 'developer', 'user' or 'install'.
* @param number $id Element's id.
* @param string $public_key Public key.
* @param bool $is_sandbox
* @param bool|string $secret_key Element's secret key.
* @param null|string $sdk_version
*
* @return FS_Api
*/
static function instance(
$slug,
$scope,
$id,
$public_key,
$is_sandbox,
$secret_key = false,
$sdk_version = null
) {
$identifier = md5( $slug . $scope . $id . $public_key . ( is_string( $secret_key ) ? $secret_key : '' ) . json_encode( $is_sandbox ) );
if ( ! isset( self::$_instances[ $identifier ] ) ) {
self::_init();
self::$_instances[ $identifier ] = new FS_Api( $slug, $scope, $id, $public_key, $secret_key, $is_sandbox, $sdk_version );
}
return self::$_instances[ $identifier ];
}
private static function _init() {
if ( isset( self::$_options ) ) {
return;
}
if ( ! class_exists( 'Freemius_Api_WordPress' ) ) {
require_once WP_FS__DIR_SDK . '/FreemiusWordPress.php';
}
self::$_options = FS_Option_Manager::get_manager( WP_FS__OPTIONS_OPTION_NAME, true, true );
self::$_cache = FS_Cache_Manager::get_manager( WP_FS__API_CACHE_OPTION_NAME );
self::$_clock_diff = self::$_options->get_option( 'api_clock_diff', 0 );
Freemius_Api_WordPress::SetClockDiff( self::$_clock_diff );
if ( self::$_options->get_option( 'api_force_http', false ) ) {
Freemius_Api_WordPress::SetHttp();
}
}
/**
* @param string $slug
* @param string $scope 'app', 'developer', 'user' or 'install'.
* @param number $id Element's id.
* @param string $public_key Public key.
* @param bool|string $secret_key Element's secret key.
* @param bool $is_sandbox
* @param null|string $sdk_version
*/
private function __construct(
$slug,
$scope,
$id,
$public_key,
$secret_key,
$is_sandbox,
$sdk_version
) {
$this->_api = new Freemius_Api_WordPress( $scope, $id, $public_key, $secret_key, $is_sandbox );
$this->_slug = $slug;
$this->_sdk_version = $sdk_version;
$this->_logger = FS_Logger::get_logger( WP_FS__SLUG . '_' . $slug . '_api', WP_FS__DEBUG_SDK, WP_FS__ECHO_DEBUG_SDK );
}
/**
* Find clock diff between server and API server, and store the diff locally.
*
* @param bool|int $diff
*
* @return bool|int False if clock diff didn't change, otherwise returns the clock diff in seconds.
*/
private function _sync_clock_diff( $diff = false ) {
$this->_logger->entrance();
// Sync clock and store.
$new_clock_diff = ( false === $diff ) ?
Freemius_Api_WordPress::FindClockDiff() :
$diff;
if ( $new_clock_diff === self::$_clock_diff ) {
return false;
}
self::$_clock_diff = $new_clock_diff;
// Update API clock's diff.
Freemius_Api_WordPress::SetClockDiff( self::$_clock_diff );
// Store new clock diff in storage.
self::$_options->set_option( 'api_clock_diff', self::$_clock_diff, true );
return $new_clock_diff;
}
/**
* Override API call to enable retry with servers' clock auto sync method.
*
* @param string $path
* @param string $method
* @param array $params
* @param bool $retry Is in retry or first call attempt.
*
* @return array|mixed|string|void
*/
private function _call( $path, $method = 'GET', $params = array(), $retry = false ) {
$this->_logger->entrance( $method . ':' . $path );
if ( self::is_temporary_down() ) {
$result = $this->get_temporary_unavailable_error();
} else {
/**
* @since 2.3.0 Include the SDK version with all API requests that going through the API manager. IMPORTANT: Only pass the SDK version if the caller didn't include it yet.
*/
if ( ! empty( $this->_sdk_version ) ) {
if ( false === strpos( $path, 'sdk_version=' ) &&
! isset( $params['sdk_version'] )
) {
// Always add the sdk_version param in the querystring. DO NOT INCLUDE IT IN THE BODY PARAMS, OTHERWISE, IT MAY LEAD TO AN UNEXPECTED PARAMS PARSING IN CASES WHERE THE $params IS A REGULAR NON-ASSOCIATIVE ARRAY.
$path = add_query_arg( 'sdk_version', $this->_sdk_version, $path );
}
}
$result = $this->_api->Api( $path, $method, $params );
if ( null !== $result &&
isset( $result->error ) &&
isset( $result->error->code ) &&
'request_expired' === $result->error->code
) {
if ( ! $retry ) {
$diff = isset( $result->error->timestamp ) ?
( time() - strtotime( $result->error->timestamp ) ) :
false;
// Try to sync clock diff.
if ( false !== $this->_sync_clock_diff( $diff ) ) {
// Retry call with new synced clock.
return $this->_call( $path, $method, $params, true );
}
}
}
}
if ( $this->_logger->is_on() && self::is_api_error( $result ) ) {
// Log API errors.
$this->_logger->api_error( $result );
}
return $result;
}
/**
* Override API call to wrap it in servers' clock sync method.
*
* @param string $path
* @param string $method
* @param array $params
*
* @return array|mixed|string|void
* @throws Freemius_Exception
*/
function call( $path, $method = 'GET', $params = array() ) {
return $this->_call( $path, $method, $params );
}
/**
* Get API request URL signed via query string.
*
* @param string $path
*
* @return string
*/
function get_signed_url( $path ) {
return $this->_api->GetSignedUrl( $path );
}
/**
* @param string $path
* @param bool $flush
* @param int $expiration (optional) Time until expiration in seconds from now, defaults to 24 hours
*
* @return stdClass|mixed
*/
function get( $path = '/', $flush = false, $expiration = WP_FS__TIME_24_HOURS_IN_SEC ) {
$this->_logger->entrance( $path );
$cache_key = $this->get_cache_key( $path );
// Always flush during development.
if ( WP_FS__DEV_MODE || $this->_api->IsSandbox() ) {
$flush = true;
}
$cached_result = self::$_cache->get( $cache_key );
if ( $flush || ! self::$_cache->has_valid( $cache_key, $expiration ) ) {
$result = $this->call( $path );
if ( ! is_object( $result ) || isset( $result->error ) ) {
// Api returned an error.
if ( is_object( $cached_result ) &&
! isset( $cached_result->error )
) {
// If there was an error during a newer data fetch,
// fallback to older data version.
$result = $cached_result;
if ( $this->_logger->is_on() ) {
$this->_logger->warn( 'Fallback to cached API result: ' . var_export( $cached_result, true ) );
}
} else {
if ( is_object( $result ) && 404 == $result->error->http ) {
/**
* If the response code is 404, cache the result for half of the `$expiration`.
*
* @author Leo Fajardo (@leorw)
* @since 2.2.4
*/
$expiration /= 2;
} else {
// If no older data version and the response code is not 404, return result without
// caching the error.
return $result;
}
}
}
self::$_cache->set( $cache_key, $result, $expiration );
$cached_result = $result;
} else {
$this->_logger->log( 'Using cached API result.' );
}
return $cached_result;
}
/**
* Check if there's a cached version of the API request.
*
* @author Vova Feldman (@svovaf)
* @since 1.2.1
*
* @param string $path
* @param string $method
* @param array $params
*
* @return bool
*/
function is_cached( $path, $method = 'GET', $params = array() ) {
$cache_key = $this->get_cache_key( $path, $method, $params );
return self::$_cache->has_valid( $cache_key );
}
/**
* Invalidate a cached version of the API request.
*
* @author Vova Feldman (@svovaf)
* @since 1.2.1.5
*
* @param string $path
* @param string $method
* @param array $params
*/
function purge_cache( $path, $method = 'GET', $params = array() ) {
$this->_logger->entrance( "{$method}:{$path}" );
$cache_key = $this->get_cache_key( $path, $method, $params );
self::$_cache->purge( $cache_key );
}
/**
* Invalidate a cached version of the API request.
*
* @author Vova Feldman (@svovaf)
* @since 2.0.0
*
* @param string $path
* @param int $expiration
* @param string $method
* @param array $params
*/
function update_cache_expiration( $path, $expiration = WP_FS__TIME_24_HOURS_IN_SEC, $method = 'GET', $params = array() ) {
$this->_logger->entrance( "{$method}:{$path}:{$expiration}" );
$cache_key = $this->get_cache_key( $path, $method, $params );
self::$_cache->update_expiration( $cache_key, $expiration );
}
/**
* @param string $path
* @param string $method
* @param array $params
*
* @return string
* @throws \Freemius_Exception
*/
private function get_cache_key( $path, $method = 'GET', $params = array() ) {
$canonized = $this->_api->CanonizePath( $path );
// $exploded = explode('/', $canonized);
// return $method . '_' . array_pop($exploded) . '_' . md5($canonized . json_encode($params));
return strtolower( $method . ':' . $canonized ) . ( ! empty( $params ) ? '#' . md5( json_encode( $params ) ) : '' );
}
/**
* Test API connectivity.
*
* @author Vova Feldman (@svovaf)
* @since 1.0.9 If fails, try to fallback to HTTP.
* @since 1.1.6 Added a 5-min caching mechanism, to prevent from overloading the server if the API if
* temporary down.
*
* @return bool True if successful connectivity to the API.
*/
static function test() {
self::_init();
$cache_key = 'ping_test';
$test = self::$_cache->get_valid( $cache_key, null );
if ( is_null( $test ) ) {
$test = Freemius_Api_WordPress::Test();
if ( false === $test && Freemius_Api_WordPress::IsHttps() ) {
// Fallback to HTTP, since HTTPS fails.
Freemius_Api_WordPress::SetHttp();
self::$_options->set_option( 'api_force_http', true, true );
$test = Freemius_Api_WordPress::Test();
if ( false === $test ) {
/**
* API connectivity test fail also in HTTP request, therefore,
* fallback to HTTPS to keep connection secure.
*
* @since 1.1.6
*/
self::$_options->set_option( 'api_force_http', false, true );
}
}
self::$_cache->set( $cache_key, $test, WP_FS__TIME_5_MIN_IN_SEC );
}
return $test;
}
/**
* Check if API is temporary down.
*
* @author Vova Feldman (@svovaf)
* @since 1.1.6
*
* @return bool
*/
static function is_temporary_down() {
self::_init();
$test = self::$_cache->get_valid( 'ping_test', null );
return ( false === $test );
}
/**
* @author Vova Feldman (@svovaf)
* @since 1.1.6
*
* @return object
*/
private function get_temporary_unavailable_error() {
return (object) array(
'error' => (object) array(
'type' => 'TemporaryUnavailable',
'message' => 'API is temporary unavailable, please retry in ' . ( self::$_cache->get_record_expiration( 'ping_test' ) - WP_FS__SCRIPT_START_TIME ) . ' sec.',
'code' => 'temporary_unavailable',
'http' => 503
)
);
}
/**
* Ping API for connectivity test, and return result object.
*
* @author Vova Feldman (@svovaf)
* @since 1.0.9
*
* @param null|string $unique_anonymous_id
* @param array $params
*
* @return object
*/
function ping( $unique_anonymous_id = null, $params = array() ) {
$this->_logger->entrance();
if ( self::is_temporary_down() ) {
return $this->get_temporary_unavailable_error();
}
$pong = is_null( $unique_anonymous_id ) ?
Freemius_Api_WordPress::Ping() :
$this->_call( 'ping.json?' . http_build_query( array_merge(
array( 'uid' => $unique_anonymous_id ),
$params
) ) );
if ( $this->is_valid_ping( $pong ) ) {
return $pong;
}
if ( self::should_try_with_http( $pong ) ) {
// Fallback to HTTP, since HTTPS fails.
Freemius_Api_WordPress::SetHttp();
self::$_options->set_option( 'api_force_http', true, true );
$pong = is_null( $unique_anonymous_id ) ?
Freemius_Api_WordPress::Ping() :
$this->_call( 'ping.json?' . http_build_query( array_merge(
array( 'uid' => $unique_anonymous_id ),
$params
) ) );
if ( ! $this->is_valid_ping( $pong ) ) {
self::$_options->set_option( 'api_force_http', false, true );
}
}
return $pong;
}
/**
* Check if based on the API result we should try
* to re-run the same request with HTTP instead of HTTPS.
*
* @author Vova Feldman (@svovaf)
* @since 1.1.6
*
* @param $result
*
* @return bool
*/
private static function should_try_with_http( $result ) {
if ( ! Freemius_Api_WordPress::IsHttps() ) {
return false;
}
return ( ! is_object( $result ) ||
! isset( $result->error ) ||
! isset( $result->error->code ) ||
! in_array( $result->error->code, array(
'curl_missing',
'cloudflare_ddos_protection',
'maintenance_mode',
'squid_cache_block',
'too_many_requests',
) ) );
}
/**
* Check if valid ping request result.
*
* @author Vova Feldman (@svovaf)
* @since 1.1.1
*
* @param mixed $pong
*
* @return bool
*/
function is_valid_ping( $pong ) {
return Freemius_Api_WordPress::Test( $pong );
}
function get_url( $path = '' ) {
return Freemius_Api_WordPress::GetUrl( $path, $this->_api->IsSandbox() );
}
/**
* Clear API cache.
*
* @author Vova Feldman (@svovaf)
* @since 1.0.9
*/
static function clear_cache() {
self::_init();
self::$_cache = FS_Cache_Manager::get_manager( WP_FS__API_CACHE_OPTION_NAME );
self::$_cache->clear();
}
#----------------------------------------------------------------------------------
#region Error Handling
#----------------------------------------------------------------------------------
/**
* @author Vova Feldman (@svovaf)
* @since 1.2.1.5
*
* @param mixed $result
*
* @return bool Is API result contains an error.
*/
static function is_api_error( $result ) {
return ( is_object( $result ) && isset( $result->error ) ) ||
is_string( $result );
}
/**
* @author Vova Feldman (@svovaf)
* @since 2.0.0
*
* @param mixed $result
*
* @return bool Is API result contains an error.
*/
static function is_api_error_object( $result ) {
return (
is_object( $result ) &&
isset( $result->error ) &&
isset( $result->error->message )
);
}
/**
* Checks if given API result is a non-empty and not an error object.
*
* @author Vova Feldman (@svovaf)
* @since 1.2.1.5
*
* @param mixed $result
* @param string|null $required_property Optional property we want to verify that is set.
*
* @return bool
*/
static function is_api_result_object( $result, $required_property = null ) {
return (
is_object( $result ) &&
! isset( $result->error ) &&
( empty( $required_property ) || isset( $result->{$required_property} ) )
);
}
/**
* Checks if given API result is a non-empty entity object with non-empty ID.
*
* @author Vova Feldman (@svovaf)
* @since 1.2.1.5
*
* @param mixed $result
*
* @return bool
*/
static function is_api_result_entity( $result ) {
return self::is_api_result_object( $result, 'id' ) &&
FS_Entity::is_valid_id( $result->id );
}
/**
* Get API result error code. If failed to get code, returns an empty string.
*
* @author Vova Feldman (@svovaf)
* @since 2.0.0
*
* @param mixed $result
*
* @return string
*/
static function get_error_code( $result ) {
if ( is_object( $result ) &&
isset( $result->error ) &&
is_object( $result->error ) &&
! empty( $result->error->code )
) {
return $result->error->code;
}
return '';
}
#endregion
}
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