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<?php

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/**

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* Integration API

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* @link https://contactform7.com/integration-with-external-apis/

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class WPCF7_Integration {

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private static $instance;

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private $services = array();

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private $categories = array();

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private function __construct() {}

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/**

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* Returns initially supported service categories.

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* @return array Service categories.

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public static function get_builtin_categories() {

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return array(

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'spam_protection' => __( 'Spam protection', 'contact-form-7' ),

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'email_marketing' => __( 'Email marketing', 'contact-form-7' ),

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'payments' => __( 'Payments', 'contact-form-7' ),

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);

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}

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/**

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* Returns the singleton instance of this class.

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* @return WPCF7_Integration The instance.

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public static function get_instance() {

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if ( empty( self::$instance ) ) {

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self::$instance = new self;

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self::$instance->categories = self::get_builtin_categories();

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}

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return self::$instance;

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}

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/**

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* Adds a service to the services list.

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public function add_service( $name, WPCF7_Service $service ) {

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$name = sanitize_key( $name );

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if ( empty( $name )

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or isset( $this->services[$name] ) ) {

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return false;

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}

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$this->services[$name] = $service;

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}

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/**

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* Adds a service category to the categories list.

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public function add_category( $name, $title ) {

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$name = sanitize_key( $name );

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if ( empty( $name )

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or isset( $this->categories[$name] ) ) {

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return false;

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}

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$this->categories[$name] = $title;

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}

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/**

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* Returns true if a service with the name exists in the services list.

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* @param string $name The name of service to search.

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public function service_exists( $name = '' ) {

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if ( '' == $name ) {

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return (bool) count( $this->services );

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} else {

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return isset( $this->services[$name] );

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}

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}

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/**

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* Returns a service object with the name.

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* @param string $name The name of service.

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* @return WPCF7_Service|bool The service object if it exists,

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* false otherwise.

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public function get_service( $name ) {

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if ( $this->service_exists( $name ) ) {

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return $this->services[$name];

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} else {

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return false;

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}

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}

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/**

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* Prints services list.

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public function list_services( $args = '' ) {

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$args = wp_parse_args( $args, array(

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'include' => array(),

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) );

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$singular = false;

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$services = (array) $this->services;

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if ( ! empty( $args['include'] ) ) {

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$services = array_intersect_key( $services,

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array_flip( (array) $args['include'] )

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);

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if ( 1 == count( $services ) ) {

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$singular = true;

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}

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}

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if ( empty( $services ) ) {

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return;

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}

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$action = wpcf7_current_action();

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foreach ( $services as $name => $service ) {

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$cats = array_intersect_key( $this->categories,

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array_flip( $service->get_categories() )

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);

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<div class="card<?php echo $service->is_active() ? ' active' : ''; ?>" id="<?php echo esc_attr( $name ); ?>">

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<?php $service->icon(); ?>

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<h2 class="title"><?php echo esc_html( $service->get_title() ); ?></h2>

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<?php echo esc_html( implode( ', ', $cats ) ); ?>

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<br />

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<?php $service->link(); ?>

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</div>

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<?php

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if ( $singular ) {

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$service->display( $action );

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} else {

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$service->display();

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}

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</div>

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</div>

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<?php

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}

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}

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}

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/**

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* Abstract class for services.

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* Only instances of this class's subclasses are allowed to be

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* listed on the Integration page.

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abstract class WPCF7_Service {

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abstract public function get_title();

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abstract public function is_active();

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public function get_categories() {

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return array();

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}

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public function icon() {

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return '';

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}

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public function link() {

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return '';

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}

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public function load( $action = '' ) {

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}

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public function display( $action = '' ) {

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}

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public function admin_notice( $message = '' ) {

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}

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}

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/**

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* Class for services that use OAuth.

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* While this is not an abstract class, subclassing this class for

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* your aim is advised.

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class WPCF7_Service_OAuth2 extends WPCF7_Service {

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protected $client_id = '';

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protected $client_secret = '';

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protected $access_token = '';

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protected $refresh_token = '';

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protected $authorization_endpoint = 'https://example.com/authorization';

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protected $token_endpoint = 'https://example.com/token';

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public function get_title() {

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return '';

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}

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public function is_active() {

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return ! empty( $this->refresh_token );

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}

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protected function save_data() {

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}

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protected function reset_data() {

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}

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protected function get_redirect_uri() {

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return admin_url();

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}

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protected function menu_page_url( $args = '' ) {

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return menu_page_url( 'wpcf7-integration', false );

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}

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public function load( $action = '' ) {

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if ( 'auth_redirect' === $action ) {

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$code = $_GET['code'] ?? '';

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if ( $code ) {

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$this->request_token( $code );

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}

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

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$message = 'success';

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} else {

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$message = 'failed';

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}

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wp_safe_redirect( $this->menu_page_url(

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array(

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'action' => 'setup',

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'message' => $message,

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)

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) );

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exit();

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}

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}

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protected function authorize( $scope = '' ) {

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$endpoint = add_query_arg(

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array(

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'response_type' => 'code',

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'client_id' => $this->client_id,

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'redirect_uri' => urlencode( $this->get_redirect_uri() ),

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'scope' => $scope,

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$this->authorization_endpoint

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);

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if ( wp_redirect( sanitize_url( $endpoint ) ) ) {

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exit();

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}

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}

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protected function get_http_authorization_header( $scheme = 'basic' ) {

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$scheme = strtolower( trim( $scheme ) );

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switch ( $scheme ) {

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case 'bearer':

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return sprintf( 'Bearer %s', $this->access_token );

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case 'basic':

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default:

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return sprintf( 'Basic %s',

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base64_encode( $this->client_id . ':' . $this->client_secret )

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);

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}

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}

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protected function request_token( $authorization_code ) {

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$endpoint = add_query_arg(

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array(

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'code' => $authorization_code,

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'redirect_uri' => urlencode( $this->get_redirect_uri() ),

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'grant_type' => 'authorization_code',

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$this->token_endpoint

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);

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$request = array(

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'headers' => array(

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'Authorization' => $this->get_http_authorization_header( 'basic' ),

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);

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$response = wp_remote_post( sanitize_url( $endpoint ), $request );

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$response_code = (int) wp_remote_retrieve_response_code( $response );

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$response_body = wp_remote_retrieve_body( $response );

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$response_body = json_decode( $response_body, true );

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if ( WP_DEBUG and 400 <= $response_code ) {

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$this->log( $endpoint, $request, $response );

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}

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if ( 401 == $response_code ) { // Unauthorized

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$this->access_token = null;

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$this->refresh_token = null;

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} else {

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if ( isset( $response_body['access_token'] ) ) {

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$this->access_token = $response_body['access_token'];

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} else {

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$this->access_token = null;

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}

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if ( isset( $response_body['refresh_token'] ) ) {

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$this->refresh_token = $response_body['refresh_token'];

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} else {

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$this->refresh_token = null;

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}

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}

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$this->save_data();

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return $response;

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}

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protected function refresh_token() {

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$endpoint = add_query_arg(

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array(

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'refresh_token' => $this->refresh_token,

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'grant_type' => 'refresh_token',

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$this->token_endpoint

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);

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$request = array(

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'headers' => array(

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'Authorization' => $this->get_http_authorization_header( 'basic' ),

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);

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$response = wp_remote_post( sanitize_url( $endpoint ), $request );

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$response_code = (int) wp_remote_retrieve_response_code( $response );

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$response_body = wp_remote_retrieve_body( $response );

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$response_body = json_decode( $response_body, true );

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if ( WP_DEBUG and 400 <= $response_code ) {

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$this->log( $endpoint, $request, $response );

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}

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if ( 401 == $response_code ) { // Unauthorized

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$this->access_token = null;

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$this->refresh_token = null;

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} else {

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if ( isset( $response_body['access_token'] ) ) {

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$this->access_token = $response_body['access_token'];

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} else {

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$this->access_token = null;

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}

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if ( isset( $response_body['refresh_token'] ) ) {

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$this->refresh_token = $response_body['refresh_token'];

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}

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}

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$this->save_data();

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return $response;

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}

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protected function remote_request( $url, $request = array() ) {

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static $refreshed = false;

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$request = wp_parse_args( $request, array() );

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$request['headers'] = array_merge(

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$request['headers'],

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array(

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'Authorization' => $this->get_http_authorization_header( 'bearer' ),

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)

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);

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$response = wp_remote_request( sanitize_url( $url ), $request );

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if ( 401 === wp_remote_retrieve_response_code( $response )

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and ! $refreshed ) {

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$this->refresh_token();

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$refreshed = true;

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$response = $this->remote_request( $url, $request );

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}

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return $response;

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}

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protected function log( $url, $request, $response ) {

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wpcf7_log_remote_request( $url, $request, $response );

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}

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}

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