laipower/wp-content/plugins/activitypub/includes/rest/class-server.php

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<?php
namespace Activitypub\Rest;
use stdClass;
use WP_Error;
use WP_REST_Response;
use Activitypub\Signature;
use Activitypub\Model\Application_User;
/**
* 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() {
self::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() {
$user = new Application_User();
$user->set_context(
\Activitypub\Activity\Activity::CONTEXT
);
$json = $user->to_array();
$rest_response = new WP_REST_Response( $json, 200 );
$rest_response->header( 'Content-Type', 'application/activity+json; charset=' . get_option( 'blog_charset' ) );
return $rest_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 ) {
if ( 'HEAD' === $request->get_method() ) {
return $response;
}
$route = $request->get_route();
// check if it is an activitypub request and exclude webfinger and nodeinfo endpoints
if (
! \str_starts_with( $route, '/' . ACTIVITYPUB_REST_NAMESPACE ) ||
\str_starts_with( $route, '/' . \trailingslashit( ACTIVITYPUB_REST_NAMESPACE ) . 'webfinger' ) ||
\str_starts_with( $route, '/' . \trailingslashit( ACTIVITYPUB_REST_NAMESPACE ) . 'nodeinfo' )
) {
return $response;
}
/**
* Filter to defer signature verification
*
* Skip signature verification for debugging purposes or to reduce load for
* certain Activity-Types, like "Delete".
*
* @param bool $defer Whether to defer signature verification.
* @param WP_REST_Request $request The request used to generate the response.
*
* @return bool Whether to defer signature verification.
*/
$defer = \apply_filters( 'activitypub_defer_signature_verification', false, $request );
if ( $defer ) {
return $response;
}
// POST-Requets are always signed
if ( 'GET' !== $request->get_method() ) {
$verified_request = Signature::verify_http_signature( $request );
if ( \is_wp_error( $verified_request ) ) {
return new WP_Error(
'activitypub_signature_verification',
$verified_request->get_error_message(),
array( 'status' => 401 )
);
}
} elseif ( 'GET' === $request->get_method() && ACTIVITYPUB_AUTHORIZED_FETCH ) { // GET-Requests are only signed in secure mode
$verified_request = Signature::verify_http_signature( $request );
if ( \is_wp_error( $verified_request ) ) {
return new WP_Error(
'activitypub_signature_verification',
$verified_request->get_error_message(),
array( 'status' => 401 )
);
}
}
return $response;
}
}