<?php

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/**

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* @package Freemius

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* @copyright Copyright (c) 2015, Freemius, Inc.

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* @license https://www.gnu.org/licenses/gpl-3.0.html GNU General Public License Version 3

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* @since 1.0.4

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*/

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if ( ! defined( 'ABSPATH' ) ) {

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exit;

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}

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/**

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* Class FS_Api

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*

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* Wraps Freemius API SDK to handle:

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* 1. Clock sync.

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* 2. Fallback to HTTP when HTTPS fails.

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* 3. Adds caching layer to GET requests.

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* 4. Adds consistency for failed requests by using last cached version.

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*/

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class FS_Api {

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/**

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* @var FS_Api[]

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*/

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private static $_instances = array();

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/**

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* @var FS_Option_Manager Freemius options, options-manager.

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*/

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private static $_options;

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/**

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* @var FS_Cache_Manager API Caching layer

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*/

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private static $_cache;

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/**

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* @var int Clock diff in seconds between current server to API server.

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*/

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private static $_clock_diff;

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/**

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* @var Freemius_Api_WordPress

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*/

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private $_api;

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/**

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* @var string

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*/

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private $_slug;

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/**

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* @var FS_Logger

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* @since 1.0.4

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*/

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private $_logger;

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/**

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* @author Leo Fajardo (@leorw)

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* @since 2.3.0

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*

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* @var string

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*/

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private $_sdk_version;

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/**

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* @author Leo Fajardo (@leorw)

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* @since 2.5.0

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*

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* @var string

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*/

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private $_url;

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/**

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* @param string $slug

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* @param string $scope 'app', 'developer', 'user' or 'install'.

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* @param number $id Element's id.

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* @param string $public_key Public key.

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* @param bool $is_sandbox

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* @param bool|string $secret_key Element's secret key.

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* @param null|string $sdk_version

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* @param null|string $url

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*

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* @return FS_Api

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*/

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static function instance(

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$slug,

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$scope,

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$id,

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$public_key,

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$is_sandbox,

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$secret_key = false,

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$sdk_version = null,

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$url = null

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) {

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$identifier = md5( $slug . $scope . $id . $public_key . ( is_string( $secret_key ) ? $secret_key : '' ) . json_encode( $is_sandbox ) );

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if ( ! isset( self::$_instances[ $identifier ] ) ) {

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self::_init();

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self::$_instances[ $identifier ] = new FS_Api( $slug, $scope, $id, $public_key, $secret_key, $is_sandbox, $sdk_version, $url );

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}

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return self::$_instances[ $identifier ];

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}

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private static function _init() {

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if ( isset( self::$_options ) ) {

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return;

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}

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if ( ! class_exists( 'Freemius_Api_WordPress' ) ) {

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require_once WP_FS__DIR_SDK . '/FreemiusWordPress.php';

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}

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self::$_options = FS_Option_Manager::get_manager( WP_FS__OPTIONS_OPTION_NAME, true, true );

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self::$_cache = FS_Cache_Manager::get_manager( WP_FS__API_CACHE_OPTION_NAME );

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self::$_clock_diff = self::$_options->get_option( 'api_clock_diff', 0 );

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Freemius_Api_WordPress::SetClockDiff( self::$_clock_diff );

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if ( self::$_options->get_option( 'api_force_http', false ) ) {

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Freemius_Api_WordPress::SetHttp();

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}

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}

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/**

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* @param string $slug

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* @param string $scope 'app', 'developer', 'user' or 'install'.

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* @param number $id Element's id.

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* @param string $public_key Public key.

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* @param bool|string $secret_key Element's secret key.

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* @param bool $is_sandbox

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* @param null|string $sdk_version

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* @param null|string $url

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*/

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private function __construct(

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$slug,

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$scope,

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$id,

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$public_key,

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$secret_key,

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$is_sandbox,

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$sdk_version,

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$url

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) {

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$this->_api = new Freemius_Api_WordPress( $scope, $id, $public_key, $secret_key, $is_sandbox );

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$this->_slug = $slug;

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$this->_sdk_version = $sdk_version;

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$this->_url = $url;

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$this->_logger = FS_Logger::get_logger( WP_FS__SLUG . '_' . $slug . '_api', WP_FS__DEBUG_SDK, WP_FS__ECHO_DEBUG_SDK );

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}

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/**

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* Find clock diff between server and API server, and store the diff locally.

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*

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* @param bool|int $diff

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*

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* @return bool|int False if clock diff didn't change, otherwise returns the clock diff in seconds.

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*/

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private function _sync_clock_diff( $diff = false ) {

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$this->_logger->entrance();

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// Sync clock and store.

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$new_clock_diff = ( false === $diff ) ?

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Freemius_Api_WordPress::FindClockDiff() :

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$diff;

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if ( $new_clock_diff === self::$_clock_diff ) {

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return false;

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}

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self::$_clock_diff = $new_clock_diff;

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// Update API clock's diff.

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Freemius_Api_WordPress::SetClockDiff( self::$_clock_diff );

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// Store new clock diff in storage.

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self::$_options->set_option( 'api_clock_diff', self::$_clock_diff, true );

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return $new_clock_diff;

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}

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/**

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* Override API call to enable retry with servers' clock auto sync method.

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*

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* @param string $path

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* @param string $method

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* @param array $params

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* @param bool $in_retry Is in retry or first call attempt.

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*

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* @return array|mixed|string|void

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*/

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private function _call( $path, $method = 'GET', $params = array(), $in_retry = false ) {

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$this->_logger->entrance( $method . ':' . $path );

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$force_http = ( ! $in_retry && self::$_options->get_option( 'api_force_http', false ) );

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if ( self::is_temporary_down() ) {

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$result = $this->get_temporary_unavailable_error();

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} else {

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/**

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* @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.

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*/

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if ( ! empty( $this->_sdk_version ) ) {

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if ( false === strpos( $path, 'sdk_version=' ) &&

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! isset( $params['sdk_version'] )

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) {

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// 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.

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$path = add_query_arg( 'sdk_version', $this->_sdk_version, $path );

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}

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}

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/**

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* @since 2.5.0 Include the site's URL, if available, in all API requests that are going through the API manager.

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*/

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if ( ! empty( $this->_url ) ) {

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if ( false === strpos( $path, 'url=' ) &&

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! isset( $params['url'] )

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) {

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$path = add_query_arg( 'url', $this->_url, $path );

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}

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}

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$result = $this->_api->Api( $path, $method, $params );

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if (

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! $in_retry &&

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null !== $result &&

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isset( $result->error ) &&

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isset( $result->error->code )

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) {

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$retry = false;

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if ( 'request_expired' === $result->error->code ) {

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$diff = isset( $result->error->timestamp ) ?

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( time() - strtotime( $result->error->timestamp ) ) :

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false;

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// Try to sync clock diff.

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if ( false !== $this->_sync_clock_diff( $diff ) ) {

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// Retry call with new synced clock.

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$retry = true;

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}

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} else if (

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Freemius_Api_WordPress::IsHttps() &&

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FS_Api::is_ssl_error_response( $result )

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) {

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$force_http = true;

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$retry = true;

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}

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if ( $retry ) {

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if ( $force_http ) {

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$this->toggle_force_http( true );

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}

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$result = $this->_call( $path, $method, $params, true );

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}

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}

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}

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if ( self::is_api_error( $result ) ) {

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if ( $this->_logger->is_on() ) {

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// Log API errors.

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$this->_logger->api_error( $result );

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}

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if ( $force_http ) {

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$this->toggle_force_http( false );

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}

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}

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return $result;

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}

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/**

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* Override API call to wrap it in servers' clock sync method.

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*

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* @param string $path

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* @param string $method

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* @param array $params

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*

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* @return array|mixed|string|void

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* @throws Freemius_Exception

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*/

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function call( $path, $method = 'GET', $params = array() ) {

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return $this->_call( $path, $method, $params );

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}

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/**

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* Get API request URL signed via query string.

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*

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* @param string $path

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*

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* @return string

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*/

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function get_signed_url( $path ) {

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return $this->_api->GetSignedUrl( $path );

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}

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/**

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* @param string $path

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* @param bool $flush

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* @param int $expiration (optional) Time until expiration in seconds from now, defaults to 24 hours

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*

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* @return stdClass|mixed

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*/

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function get( $path = '/', $flush = false, $expiration = WP_FS__TIME_24_HOURS_IN_SEC ) {

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$this->_logger->entrance( $path );

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$cache_key = $this->get_cache_key( $path );

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// Always flush during development.

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if ( WP_FS__DEV_MODE || $this->_api->IsSandbox() ) {

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$flush = true;

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}

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$cached_result = self::$_cache->get( $cache_key );

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if ( $flush || ! self::$_cache->has_valid( $cache_key, $expiration ) ) {

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$result = $this->call( $path );

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if ( ! is_object( $result ) || isset( $result->error ) ) {

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// Api returned an error.

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if ( is_object( $cached_result ) &&

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! isset( $cached_result->error )

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) {

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// If there was an error during a newer data fetch,

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// fallback to older data version.

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$result = $cached_result;

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if ( $this->_logger->is_on() ) {

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$this->_logger->warn( 'Fallback to cached API result: ' . var_export( $cached_result, true ) );

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}

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} else {

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if ( is_object( $result ) && isset( $result->error->http ) && 404 == $result->error->http ) {

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/**

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* If the response code is 404, cache the result for half of the `$expiration`.

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*

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* @author Leo Fajardo (@leorw)

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* @since 2.2.4

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*/

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$expiration /= 2;

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} else {

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// If no older data version and the response code is not 404, return result without

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// caching the error.

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return $result;

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}

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}

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}

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self::$_cache->set( $cache_key, $result, $expiration );

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$cached_result = $result;

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} else {

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$this->_logger->log( 'Using cached API result.' );

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}

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return $cached_result;

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}

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/**

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* @todo Remove this method after migrating Freemius::safe_remote_post() to FS_Api::call().

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*

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* @author Leo Fajardo (@leorw)

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* @since 2.5.4

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*

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* @param string $url

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* @param array $remote_args

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*

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* @return array|WP_Error The response array or a WP_Error on failure.

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*/

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static function remote_request( $url, $remote_args ) {

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if ( ! class_exists( 'Freemius_Api_WordPress' ) ) {

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require_once WP_FS__DIR_SDK . '/FreemiusWordPress.php';

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}

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if ( method_exists( 'Freemius_Api_WordPress', 'RemoteRequest' ) ) {

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return Freemius_Api_WordPress::RemoteRequest( $url, $remote_args );

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}

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// The following is for backward compatibility when a modified PHP SDK version is in use and the `Freemius_Api_WordPress:RemoteRequest()` method doesn't exist.

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$response = wp_remote_request( $url, $remote_args );

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if (

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is_array( $response ) &&

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(

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empty( $response['headers'] ) ||

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empty( $response['headers']['x-api-server'] )

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)

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) {

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// API is considered blocked if the response doesn't include the `x-api-server` header. When there's no error but this header doesn't exist, the response is usually not in the expected form (e.g., cannot be JSON-decoded).

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$response = new WP_Error( 'api_blocked', htmlentities( $response['body'] ) );

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}

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return $response;

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}

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/**

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* Check if there's a cached version of the API request.

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*

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* @author Vova Feldman (@svovaf)

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* @since 1.2.1

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*

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* @param string $path

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* @param string $method

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* @param array $params

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*

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* @return bool

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*/

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function is_cached( $path, $method = 'GET', $params = array() ) {

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$cache_key = $this->get_cache_key( $path, $method, $params );

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return self::$_cache->has_valid( $cache_key );

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}

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/**

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* Invalidate a cached version of the API request.

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*

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* @author Vova Feldman (@svovaf)

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* @since 1.2.1.5

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*

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* @param string $path

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* @param string $method

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* @param array $params

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*/

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function purge_cache( $path, $method = 'GET', $params = array() ) {

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$this->_logger->entrance( "{$method}:{$path}" );

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$cache_key = $this->get_cache_key( $path, $method, $params );

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self::$_cache->purge( $cache_key );

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}

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/**

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* Invalidate a cached version of the API request.

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*

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* @author Vova Feldman (@svovaf)

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* @since 2.0.0

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*

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* @param string $path

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* @param int $expiration

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* @param string $method

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* @param array $params

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*/

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function update_cache_expiration( $path, $expiration = WP_FS__TIME_24_HOURS_IN_SEC, $method = 'GET', $params = array() ) {

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$this->_logger->entrance( "{$method}:{$path}:{$expiration}" );

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$cache_key = $this->get_cache_key( $path, $method, $params );

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self::$_cache->update_expiration( $cache_key, $expiration );

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}

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/**

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* @param string $path

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* @param string $method

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* @param array $params

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*

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* @return string

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* @throws \Freemius_Exception

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*/

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private function get_cache_key( $path, $method = 'GET', $params = array() ) {

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$canonized = $this->_api->CanonizePath( $path );

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// $exploded = explode('/', $canonized);

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// return $method . '_' . array_pop($exploded) . '_' . md5($canonized . json_encode($params));

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return strtolower( $method . ':' . $canonized ) . ( ! empty( $params ) ? '#' . md5( json_encode( $params ) ) : '' );

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}

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/**

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* @author Leo Fajardo (@leorw)

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* @since 2.5.4

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*

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* @param bool $is_http

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*/

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private function toggle_force_http( $is_http ) {

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self::$_options->set_option( 'api_force_http', $is_http, true );

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if ( $is_http ) {

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Freemius_Api_WordPress::SetHttp();

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} else if ( method_exists( 'Freemius_Api_WordPress', 'SetHttps' ) ) {

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Freemius_Api_WordPress::SetHttps();

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}

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}

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/**

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* @author Leo Fajardo (@leorw)

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* @since 2.5.4

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*

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* @param mixed $response

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*

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* @return bool

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*/

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static function is_blocked( $response ) {

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return (

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self::is_api_error_object( $response, true ) &&

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isset( $response->error->code ) &&

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'api_blocked' === $response->error->code

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