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<?php

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namespace WPML\Core\REST;

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class Status {

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const PING_KEY = 'wp-rest-enabled-ping';

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const CACHE_EXPIRATION_IN_SEC = 3600;

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const ENABLED = 'enabled';

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const DISABLED = 'disabled';

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const TIMEOUT = 'timeout';

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/** @var \WP_Http */

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private $wp_http;

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/**

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* @param \WP_Http $wp_http

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public function __construct( \WP_Http $wp_http ) {

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$this->wp_http = $wp_http;

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}

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public function isEnabled() {

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// Check this condition first to avoid infinite loop in testing PING request made below.

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if ( wpml_is_rest_request() ) {

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return true;

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}

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$filters = [ 'json_enabled', 'json_jsonp_enabled', 'rest_jsonp_enabled', 'rest_enabled' ];

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foreach ( $filters as $filter ) {

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if ( ! apply_filters( $filter, true ) ) {

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return false;

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}

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}

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return $this->is_rest_accessible();

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}

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/**

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* @return bool

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private function is_rest_accessible() {

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$value = $this->cacheInTransient(

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function () {

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return $this->pingRestEndpoint();

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}

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);

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return self::DISABLED !== $value;

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}

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/**

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* @param callable $callback

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* @return mixed

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private function cacheInTransient( callable $callback ) {

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$value = get_transient( self::PING_KEY );

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if ( ! $value ) {

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$value = $callback();

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set_transient( self::PING_KEY, $value, self::CACHE_EXPIRATION_IN_SEC );

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}

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return $value;

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}

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/**

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* @return string

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private function pingRestEndpoint() {

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$url = get_rest_url( '/' );

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$response = $this->wp_http->get( $url, [

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'timeout' => 5,

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'headers' => [

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'X-WP-Nonce' => wp_create_nonce( 'wp_rest' ),

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'cookies' => $this->getCookiesWithoutSessionId(),

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] );

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if ( is_wp_error( $response ) ) {

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return $this->isTimeout( $response ) ? self::TIMEOUT : self::DISABLED;

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}

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return isset( $response['response']['code'] ) && $response['response']['code'] === 200 ? self::ENABLED : self::DISABLED;

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}

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/**

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* The PHP session ID causes the request to be blocked if some theme/plugin

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* calls `session_start` (this always leads to hit the timeout).

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* @return array

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private function getCookiesWithoutSessionId() {

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return array_diff_key( $_COOKIE, [ 'PHPSESSID' => '' ] );

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}

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/**

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* @param \WP_Error $response

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* @return bool

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private function isTimeout( \WP_Error $response ) {

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return strpos( $response->get_error_message(), 'cURL error 28: Operation timed out after' ) === 0;

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}

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}

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