wordpress-activitypub/includes/rest/class-server.php
2023-05-22 11:31:46 +02:00

115 lines
3.5 KiB
PHP

<?php
namespace Activitypub\Rest;
use stdClass;
use WP_REST_Response;
use Activitypub\Signature;
use Activitypub\Model\User;
use function Activitypub\get_context;
use function Activitypub\get_rest_url_by_path;
/**
* ActivityPub Server REST-Class
*
* @author Django Doucet
*
* @see https://www.w3.org/TR/activitypub/#security-verification
*/
class Server {
/**
* Initialize the class, registering WordPress hooks
*/
public static function init() {
\add_action( 'rest_api_init', array( self::class, 'register_routes' ) );
\add_filter( 'rest_request_before_callbacks', array( self::class, 'authorize_activitypub_requests' ), 10, 3 );
}
/**
* Register routes
*/
public static function register_routes() {
\register_rest_route(
ACTIVITYPUB_REST_NAMESPACE,
'/application',
array(
array(
'methods' => \WP_REST_Server::READABLE,
'callback' => array( self::class, 'application_actor' ),
'permission_callback' => '__return_true',
),
)
);
}
/**
* Render Application actor profile
*
* @return WP_REST_Response The JSON profile of the Application Actor.
*/
public static function application_actor() {
$json = new stdClass();
$json->{'@context'} = get_context();
$json->id = get_rest_url_by_path( 'application' );
$json->type = 'Application';
$json->preferredUsername = str_replace( array( '.' ), '-', wp_parse_url( get_site_url(), PHP_URL_HOST ) ); // phpcs:ignore WordPress.NamingConventions
$json->name = get_bloginfo( 'name' );
$json->summary = __( 'WordPress-ActivityPub application actor', 'activitypub' );
$json->manuallyApprovesFollowers = true; // phpcs:ignore WordPress.NamingConventions
$json->icon = array( get_site_icon_url() ); // phpcs:ignore WordPress.NamingConventions short array syntax
$json->publicKey = array( // phpcs:ignore WordPress.NamingConventions
'id' => get_rest_url_by_path( 'application#main-key' ),
'owner' => get_rest_url_by_path( 'application' ),
'publicKeyPem' => Signature::get_public_key( User::APPLICATION_USER_ID ), // phpcs:ignore WordPress.NamingConventions
);
$response = new WP_REST_Response( $json, 200 );
$response->header( 'Content-Type', 'application/activity+json' );
return $response;
}
/**
* Callback function to authorize each api requests
*
* @see WP_REST_Request
*
* @param WP_REST_Response|WP_HTTP_Response|WP_Error|mixed $response Result to send to the client.
* Usually a WP_REST_Response or WP_Error.
* @param array $handler Route handler used for the request.
* @param WP_REST_Request $request Request used to generate the response.
*
* @return mixed|WP_Error The response, error, or modified response.
*/
public static function authorize_activitypub_requests( $response, $handler, $request ) {
$route = $request->get_route();
if ( ! str_starts_with( $route, '/activitypub' ) ) {
return $response;
}
if ( get_rest_url_by_path( 'webfinger' ) !== $route ) {
return $response;
}
if ( 'POST' === $request->get_method() ) {
$verified_request = Signature::verify_http_signature( $request );
if ( \is_wp_error( $verified_request ) ) {
return $verified_request;
}
} elseif ( 'GET' === $request->get_method() ) {
if ( ACTIVITYPUB_SECURE_MODE ) {
$verified_request = Signature::verify_http_signature( $request );
if ( \is_wp_error( $verified_request ) ) {
return $verified_request;
}
}
}
return $response;
}
}