wordpress-activitypub/includes/rest/class-server.php

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<?php
namespace Activitypub\Rest;
use WP_REST_Response;
use Activitypub\Signature;
/**
* 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_filter( 'rest_request_before_callbacks', array( self::class, 'authorize_activitypub_requests' ), 10, 3 );
\add_action( 'rest_api_init', array( self::class, 'register_routes' ) );
}
/**
* Register routes
*/
public static function register_routes() {
\register_rest_route(
'activitypub/1.0',
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'/application',
array(
array(
'methods' => \WP_REST_Server::READABLE,
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'callback' => array( self::class, 'application_actor' ),
'permission_callback' => '__return_true',
),
)
);
}
/**
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* Render Application actor profile
*
* @return WP_REST_Response
*/
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public static function application_actor() {
$json = new \stdClass();
$json->{'@context'} = \Activitypub\get_context();
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$json->id = \get_rest_url( null, 'activitypub/1.0/application' );
$json->type = 'Application';
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$json->preferredUsername = wp_parse_url( get_site_url(), PHP_URL_HOST ); // phpcs:ignore WordPress.NamingConventions
$json->name = get_bloginfo( 'name' );
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$json->summary = 'WordPress-ActivityPub application actor';
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$json->manuallyApprovesFollowers = true; // phpcs:ignore WordPress.NamingConventions
$json->icon = array( get_site_icon_url() ); // phpcs:ignore WordPress.NamingConventions short array syntax
$json->publicKey = (object) array( // phpcs:ignore WordPress.NamingConventions
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'id' => \get_rest_url( null, 'activitypub/1.0/application#main-key' ),
'owner' => \get_rest_url( null, 'activitypub/1.0/application' ),
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'publicKeyPem' => Signature::get_public_key( -1 ), // 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 $response
* @param $handler
* @param \WP_REST_Request $request
*
* @return mixed|\WP_Error
*/
public static function authorize_activitypub_requests( $response, $handler, $request ) {
$route = $request->get_route();
if ( str_starts_with( $route, '/activitypub' ) ) {
if ( 'POST' === $request->get_method() ) {
$verified_request = Signature::verify_http_signature( $request );
if ( \is_wp_error( $verified_request ) ) {
return $verified_request;
}
} else {
if ( '/activitypub/1.0/webfinger' !== $route ) {
// SecureMode/Authorized fetch.
$secure_mode = \get_option( 'activitypub_use_secure_mode', '0' );
if ( $secure_mode ) {
$verified_request = Signature::verify_http_signature( $request );
if ( \is_wp_error( $verified_request ) ) {
return $verified_request;
}
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}
}
}
}
}
}