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<?php |
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namespace Activitypub\Rest; |
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|
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use stdClass; |
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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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/** |
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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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\add_action( 'rest_api_init', array( self::class, '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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/** |
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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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/** |
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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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$user = new Application_User(); |
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|
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$user->set_context( |
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\Activitypub\Activity\Activity::CONTEXT |
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); |
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|
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$json = $user->to_array(); |
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|
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$response = new WP_REST_Response( $json, 200 ); |
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|
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$response->header( 'Content-Type', 'application/activity+json' ); |
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|
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return $response; |
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} |
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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, $request ) { |
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$route = $request->get_route(); |
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|
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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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// POST-Requets are always signed |
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if ( 'post' === \strtolower( $request->get_method() ) ) { |
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$verified_request = Signature::verify_http_signature( $request ); |
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if ( \is_wp_error( $verified_request ) ) { |
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return $verified_request; |
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} |
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} elseif ( 'get' === \strtolower( $request->get_method() ) ) { // GET-Requests are only signed in secure mode |
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if ( ACTIVITYPUB_AUTHORIZED_FETCH ) { |
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$verified_request = Signature::verify_http_signature( $request ); |
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if ( \is_wp_error( $verified_request ) ) { |
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return $verified_request; |
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} |
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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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|
