115 lines
3.5 KiB
PHP
115 lines
3.5 KiB
PHP
<?php
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namespace Activitypub\Rest;
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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\User;
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use function Activitypub\get_context;
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use function Activitypub\get_rest_url_by_path;
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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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* 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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$json = new stdClass();
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$json->{'@context'} = get_context();
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$json->id = get_rest_url_by_path( 'application' );
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$json->type = 'Application';
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$json->preferredUsername = str_replace( array( '.' ), '-', wp_parse_url( get_site_url(), PHP_URL_HOST ) ); // phpcs:ignore WordPress.NamingConventions
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$json->name = get_bloginfo( 'name' );
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$json->summary = __( 'WordPress-ActivityPub application actor', 'activitypub' );
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$json->manuallyApprovesFollowers = true; // phpcs:ignore WordPress.NamingConventions
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$json->icon = array( get_site_icon_url() ); // phpcs:ignore WordPress.NamingConventions short array syntax
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$json->publicKey = array( // phpcs:ignore WordPress.NamingConventions
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'id' => get_rest_url_by_path( 'application#main-key' ),
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'owner' => get_rest_url_by_path( 'application' ),
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'publicKeyPem' => Signature::get_public_key( User::APPLICATION_USER_ID ), // phpcs:ignore WordPress.NamingConventions
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);
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$response = new WP_REST_Response( $json, 200 );
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$response->header( 'Content-Type', 'application/activity+json' );
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return $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, $request ) {
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$route = $request->get_route();
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if ( ! str_starts_with( $route, '/activitypub' ) ) {
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return $response;
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}
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if ( get_rest_url_by_path( 'webfinger' ) !== $route ) {
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return $response;
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}
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if ( 'POST' === $request->get_method() ) {
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$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' === $request->get_method() ) {
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if ( ACTIVITYPUB_SECURE_MODE ) {
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$verified_request = Signature::verify_http_signature( $request );
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if ( \is_wp_error( $verified_request ) ) {
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return $verified_request;
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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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