133 lines
3.8 KiB
PHP
133 lines
3.8 KiB
PHP
<?php
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namespace Activitypub\Rest;
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use stdClass;
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use WP_Error;
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use WP_REST_Response;
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use Activitypub\Signature;
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use Activitypub\Model\Application_User;
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/**
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* ActivityPub Server REST-Class
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*
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* @author Django Doucet
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*
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* @see https://www.w3.org/TR/activitypub/#security-verification
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*/
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class Server {
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/**
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* Initialize the class, registering WordPress hooks
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*/
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public static function init() {
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self::register_routes();
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\add_filter( 'rest_request_before_callbacks', array( self::class, 'authorize_activitypub_requests' ), 10, 3 );
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}
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/**
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* Register routes
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*/
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public static function register_routes() {
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\register_rest_route(
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ACTIVITYPUB_REST_NAMESPACE,
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'/application',
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array(
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array(
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'methods' => \WP_REST_Server::READABLE,
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'callback' => array( self::class, 'application_actor' ),
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'permission_callback' => '__return_true',
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),
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)
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);
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}
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/**
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* Render Application actor profile
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*
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* @return WP_REST_Response The JSON profile of the Application Actor.
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*/
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public static function application_actor() {
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$user = new Application_User();
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$user->set_context(
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\Activitypub\Activity\Activity::CONTEXT
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);
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$json = $user->to_array();
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$rest_response = new WP_REST_Response( $json, 200 );
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$rest_response->header( 'Content-Type', 'application/activity+json; charset=' . get_option( 'blog_charset' ) );
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return $rest_response;
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}
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/**
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* Callback function to authorize each api requests
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*
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* @see WP_REST_Request
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*
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* @param WP_REST_Response|WP_HTTP_Response|WP_Error|mixed $response Result to send to the client.
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* Usually a WP_REST_Response or WP_Error.
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* @param array $handler Route handler used for the request.
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* @param WP_REST_Request $request Request used to generate the response.
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*
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* @return mixed|WP_Error The response, error, or modified response.
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*/
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public static function authorize_activitypub_requests( $response, $handler, $request ) {
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if ( 'HEAD' === $request->get_method() ) {
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return $response;
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}
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$route = $request->get_route();
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// check if it is an activitypub request and exclude webfinger and nodeinfo endpoints
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if (
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! \str_starts_with( $route, '/' . ACTIVITYPUB_REST_NAMESPACE ) ||
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\str_starts_with( $route, '/' . \trailingslashit( ACTIVITYPUB_REST_NAMESPACE ) . 'webfinger' ) ||
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\str_starts_with( $route, '/' . \trailingslashit( ACTIVITYPUB_REST_NAMESPACE ) . 'nodeinfo' )
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) {
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return $response;
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}
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/**
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* Filter to defer signature verification
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*
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* Skip signature verification for debugging purposes or to reduce load for
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* certain Activity-Types, like "Delete".
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*
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* @param bool $defer Whether to defer signature verification.
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* @param WP_REST_Request $request The request used to generate the response.
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*
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* @return bool Whether to defer signature verification.
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*/
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$defer = \apply_filters( 'activitypub_defer_signature_verification', false, $request );
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if ( $defer ) {
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return $response;
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}
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// POST-Requets are always signed
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if ( 'GET' !== $request->get_method() ) {
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$verified_request = Signature::verify_http_signature( $request );
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if ( \is_wp_error( $verified_request ) ) {
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return new WP_Error(
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'activitypub_signature_verification',
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$verified_request->get_error_message(),
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array( 'status' => 401 )
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);
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}
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} elseif ( 'GET' === $request->get_method() && ACTIVITYPUB_AUTHORIZED_FETCH ) { // GET-Requests are only signed in secure mode
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$verified_request = Signature::verify_http_signature( $request );
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if ( \is_wp_error( $verified_request ) ) {
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return new WP_Error(
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'activitypub_signature_verification',
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$verified_request->get_error_message(),
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array( 'status' => 401 )
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);
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}
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}
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return $response;
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}
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}
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