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<?php

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namespace Smush\Core\Modules\Background;

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/**

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* Abstract WP_Async_Request class.

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* @abstract

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abstract class Async_Request {

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/**

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* Identifier

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* @var mixed

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* @access protected

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protected $identifier;

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/**

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* Data

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* (default value: array())

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* @var array

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* @access protected

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protected $data = array();

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/**

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* Initiate new async request

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public function __construct( $identifier ) {

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$this->identifier = $identifier;

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add_action( 'wp_ajax_' . $this->identifier, array( $this, 'maybe_handle' ) );

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add_action( 'wp_ajax_nopriv_' . $this->identifier, array( $this, 'maybe_handle' ) );

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}

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/**

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* Set data used during the request

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* @param array $data Data.

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* @return $this

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public function data( $data ) {

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$this->data = $data;

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return $this;

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}

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/**

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* Dispatch the async request

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* @param int $instance_id

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* @return array|\WP_Error

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public function dispatch( $instance_id ) {

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$query_args = $this->get_query_args( $instance_id );

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$url = add_query_arg( $query_args, $this->get_query_url() );

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$args = $this->get_post_args();

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return wp_remote_post( esc_url_raw( $url ), $args );

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}

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/**

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* Get query args

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* @return array

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protected function get_query_args( $instance_id ) {

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if ( property_exists( $this, 'query_args' ) ) {

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return $this->query_args;

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}

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return array(

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'action' => $this->identifier,

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'nonce' => wp_create_nonce( $this->identifier ),

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'instance_id' => $instance_id,

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);

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}

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/**

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* Get query URL

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* @return string

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protected function get_query_url() {

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if ( property_exists( $this, 'query_url' ) ) {

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return $this->query_url;

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}

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return admin_url( 'admin-ajax.php' );

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}

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/**

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* Get process headers.

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* @return array

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protected function get_process_headers() {

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$headers = array();

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if ( isset( $_SERVER['PHP_AUTH_USER'] ) && isset( $_SERVER['PHP_AUTH_PW'] ) ) {

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$headers['Authorization'] = 'Basic ' . base64_encode( wp_unslash( $_SERVER['PHP_AUTH_USER'] ) . ':' . wp_unslash( $_SERVER['PHP_AUTH_PW'] ) );

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}

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return apply_filters( $this->identifier . '_process_headers', $headers );

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}

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/**

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* Get post args

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* @return array

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protected function get_post_args() {

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if ( property_exists( $this, 'post_args' ) ) {

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return $this->post_args;

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}

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$post_args = array(

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'timeout' => 0.01,

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'blocking' => false,

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'body' => $this->data,

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'cookies' => $_COOKIE,

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'sslverify' => apply_filters( 'https_local_ssl_verify', false ),

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);

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$headers = $this->get_process_headers();

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if ( ! empty( $headers ) ) {

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$post_args['headers'] = $headers;

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}

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return $post_args;

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}

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/**

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* Maybe handle

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* Check for correct nonce and pass to handler.

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public function maybe_handle() {

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// Don't lock up other requests while processing

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session_write_close();

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check_ajax_referer( $this->identifier, 'nonce' );

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$instance_id = empty( $_GET['instance_id'] )

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? false

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: sanitize_key( $_GET['instance_id'] );

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$this->handle( $instance_id );

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wp_die();

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}

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/**

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* Handle

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* Override this method to perform any actions required

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* during the async request.

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abstract protected function handle( $instance_id );

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}

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