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<?php

class WPCF7_Integration {

	private static $instance;

	private $services = array();
	private $categories = array();

	private function __construct() {}

	public static function get_instance() {
		if ( empty( self::$instance ) ) {
			self::$instance = new self;
		}

		return self::$instance;
	}

	public function add_service( $name, WPCF7_Service $service ) {
		$name = sanitize_key( $name );

		if ( empty( $name )
		or isset( $this->services[$name] ) ) {
			return false;
		}

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

	public function add_category( $name, $title ) {
		$name = sanitize_key( $name );

		if ( empty( $name )
		or isset( $this->categories[$name] ) ) {
			return false;
		}

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

	public function service_exists( $name = '' ) {
		if ( '' == $name ) {
			return (bool) count( $this->services );
		} else {
			return isset( $this->services[$name] );
		}
	}

	public function get_service( $name ) {
		if ( $this->service_exists( $name ) ) {
			return $this->services[$name];
		} else {
			return false;
		}
	}

	public function list_services( $args = '' ) {
		$args = wp_parse_args( $args, array(
			'include' => array(),
		) );

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

		if ( ! empty( $args['include'] ) ) {
			$services = array_intersect_key( $services,
				array_flip( (array) $args['include'] ) );

			if ( 1 == count( $services ) ) {
				$singular = true;
			}
		}

		if ( empty( $services ) ) {
			return;
		}

		$action = wpcf7_current_action();

		foreach ( $services as $name => $service ) {
			$cats = array_intersect_key( $this->categories,
				array_flip( $service->get_categories() ) );
?>
<div class="card<?php echo $service->is_active() ? ' active' : ''; ?>" id="<?php echo esc_attr( $name ); ?>">
<?php $service->icon(); ?>
<h2 class="title"><?php echo esc_html( $service->get_title() ); ?></h2>
<div class="infobox">
<?php echo esc_html( implode( ', ', $cats ) ); ?>
<br />
<?php $service->link(); ?>
</div>
<br class="clear" />

<div class="inside">
<?php
			if ( $singular ) {
				$service->display( $action );
			} else {
				$service->display();
			}
?>
</div>
</div>
<?php
		}
	}

}

abstract class WPCF7_Service {

	abstract public function get_title();
	abstract public function is_active();

	public function get_categories() {
		return array();
	}

	public function icon() {
		return '';
	}

	public function link() {
		return '';
	}

	public function load( $action = '' ) {
	}

	public function display( $action = '' ) {
	}

	public function admin_notice( $message = '' ) {
	}

}

class WPCF7_Service_OAuth2 extends WPCF7_Service {

	protected $client_id = '';
	protected $client_secret = '';
	protected $access_token = '';
	protected $refresh_token = '';
	protected $authorization_endpoint = 'https://example.com/authorization';
	protected $token_endpoint = 'https://example.com/token';

	public function get_title() {
		return '';
	}

	public function is_active() {
		return ! empty( $this->access_token );
	}

	protected function save_data() {
	}

	protected function reset_data() {
	}

	protected function get_redirect_uri() {
		return admin_url();
	}

	protected function menu_page_url( $args = '' ) {
		return menu_page_url( 'wpcf7-integration', false );
	}

	public function load( $action = '' ) {
		if ( 'auth_redirect' == $action ) {
			$code = isset( $_GET['code'] ) ? $_GET['code'] : '';

			if ( $code ) {
				$this->request_token( $code );
			}

			wp_safe_redirect( $this->menu_page_url( 'action=setup' ) );
			exit();
		}
	}

	protected function authorize( $scope = '' ) {
		$endpoint = add_query_arg(
			array(
				'response_type' => 'code',
				'client_id' => $this->client_id,
				'redirect_uri' => urlencode( $this->get_redirect_uri() ),
				'scope' => $scope,
			),
			$this->authorization_endpoint
		);

		if ( wp_redirect( esc_url_raw( $endpoint ) ) ) {
			exit();
		}
	}

	protected function get_http_authorization_header( $scheme = 'basic' ) {
		$scheme = strtolower( trim( $scheme ) );

		switch ( $scheme ) {
			case 'bearer':
				return sprintf( 'Bearer %s', $this->access_token );
			case 'basic':
			default:
				return sprintf( 'Basic %s',
					base64_encode( $this->client_id . ':' . $this->client_secret )
				);
		}
	}

	protected function request_token( $authorization_code ) {
		$endpoint = add_query_arg(
			array(
				'code' => $authorization_code,
				'redirect_uri' => urlencode( $this->get_redirect_uri() ),
				'grant_type' => 'authorization_code',
			),
			$this->token_endpoint
		);

		$request = array(
			'headers' => array(
				'Authorization' => $this->get_http_authorization_header( 'basic' ),
			),
		);

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

		if ( WP_DEBUG
		and 400 <= (int) wp_remote_retrieve_response_code( $response ) ) {
			$this->log( $endpoint, $request, $response );
		}

		$response_body = wp_remote_retrieve_body( $response );

		if ( empty( $response_body ) ) {
			return $response;
		}

		$response_body = json_decode( $response_body, true );

		$this->access_token = isset( $response_body['access_token'] )
			? $response_body['access_token'] : null;

		$this->refresh_token = isset( $response_body['refresh_token'] )
			? $response_body['refresh_token'] : null;

		$this->save_data();

		return $response;
	}

	protected function refresh_token() {
		$endpoint = add_query_arg(
			array(
				'refresh_token' => $this->refresh_token,
				'grant_type' => 'refresh_token',
			),
			$this->token_endpoint
		);

		$request = array(
			'headers' => array(
				'Authorization' => $this->get_http_authorization_header( 'basic' ),
			),
		);

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

		if ( WP_DEBUG
		and 400 <= (int) wp_remote_retrieve_response_code( $response ) ) {
			$this->log( $endpoint, $request, $response );
		}

		$response_body = wp_remote_retrieve_body( $response );

		if ( empty( $response_body ) ) {
			return $response;
		}

		$response_body = json_decode( $response_body, true );

		$this->access_token = isset( $response_body['access_token'] )
			? $response_body['access_token'] : null;

		$this->refresh_token = isset( $response_body['refresh_token'] )
			? $response_body['refresh_token'] : null;

		$this->save_data();

		return $response;
	}

	protected function remote_request( $url, $args = array() ) {
		$request = $args = wp_parse_args( $args, array(
			'refresh_token' => true,
		) );

		unset( $request['refresh_token'] );

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

		if ( 401 === wp_remote_retrieve_response_code( $response )
		and $args['refresh_token'] ) {
			$this->refresh_token();

			$response = $this->remote_request( $url,
				array_merge( $args, array( 'refresh_token' => false ) )
			);
		}

		return $response;
	}

	protected function log( $url, $request, $response ) {
		wpcf7_log_remote_request( $url, $request, $response );
	}

}