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

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<?php
namespace Activitypub\Rest;
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/**
* ActivityPub WebFinger REST-Class
*
* @author Matthias Pfefferle
*
* @see https://webfinger.net/
*/
class Webfinger {
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/**
* Initialize the class, registering WordPress hooks
*/
public static function init() {
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\add_action( 'rest_api_init', array( '\Activitypub\Rest\Webfinger', 'register_routes' ) );
\add_action( 'webfinger_user_data', array( '\Activitypub\Rest\Webfinger', 'add_webfinger_discovery' ), 10, 3 );
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\add_action( 'webfinger_lookup', array( '\Activitypub\Rest\Webfinger', 'webfinger_lookup' ), 10, 3 );
}
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/**
* Register routes
*/
public static function register_routes() {
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\register_rest_route(
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'activitypub/1.0',
'/webfinger',
array(
array(
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'methods' => \WP_REST_Server::READABLE,
'callback' => array( '\Activitypub\Rest\Webfinger', 'webfinger' ),
'args' => self::request_parameters(),
'permission_callback' => '__return_true',
),
)
);
}
/**
* Render JRD file
*
* @param WP_REST_Request $request
* @return WP_REST_Response
*/
public static function webfinger( $request ) {
$resource = $request->get_param( 'resource' );
$matches = array();
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$matched = \preg_match( '/^acct:([^@]+)@(.+)$/', $resource, $matches );
if ( ! $matched ) {
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return new \WP_Error( 'activitypub_unsupported_resource', \__( 'Resource is invalid', 'activitypub' ), array( 'status' => 400 ) );
}
$resource_identifier = $matches[1];
$resource_host = $matches[2];
if ( \wp_parse_url( \home_url( '/' ), \PHP_URL_HOST ) !== $resource_host ) {
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return new \WP_Error( 'activitypub_wrong_host', \__( 'Resource host does not match blog host', 'activitypub' ), array( 'status' => 404 ) );
}
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$user = \get_user_by( 'login', \esc_sql( $resource_identifier ) );
if ( ! $user ) {
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return new \WP_Error( 'activitypub_user_not_found', \__( 'User not found', 'activitypub' ), array( 'status' => 404 ) );
}
$json = array(
'subject' => $resource,
'aliases' => array(
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\get_author_posts_url( $user->ID ),
),
'links' => array(
array(
'rel' => 'self',
'type' => 'application/activity+json',
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'href' => \get_author_posts_url( $user->ID ),
),
array(
'rel' => 'http://webfinger.net/rel/profile-page',
'type' => 'text/html',
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'href' => \get_author_posts_url( $user->ID ),
),
),
);
return new \WP_REST_Response( $json, 200 );
}
/**
* The supported parameters
*
* @return array list of parameters
*/
public static function request_parameters() {
$params = array();
$params['resource'] = array(
'required' => true,
'type' => 'string',
'pattern' => '^acct:([^@]+)@(.+)$',
);
return $params;
}
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/**
* Add WebFinger discovery links
*
* @param array $array the jrd array
* @param string $resource the WebFinger resource
* @param WP_User $user the WordPress user
*/
public static function add_webfinger_discovery( $array, $resource, $user ) {
$array['links'][] = array(
'rel' => 'self',
'type' => 'application/activity+json',
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'href' => \get_author_posts_url( $user->ID ),
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);
return $array;
}
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/**
* WebFinger Lookup to find user uri
*
* @param string $resource the WebFinger resource
*/
public static function webfinger_lookup( $webfinger ) {
$activity_profile = null;
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if ( \substr( $webfinger, 0, 1 ) === '@' ) {
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$webfinger = substr( $webfinger, 1 );
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}
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$url_host = \explode( '@', $webfinger );
$webfinger_query = 'https://' . \end( $url_host ) . '/.well-known/webfinger?resource=acct%3A' . \urlencode( $webfinger );
$response = \wp_safe_remote_get( $webfinger_query );
if ( ! is_wp_error( $response ) ) {
$ap_link = json_decode( $response['body'] );
if ( isset( $ap_link->links ) ) {
foreach ( $ap_link->links as $link ) {
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if ( ! property_exists( $link, 'type' ) ) {
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continue;
}
if ( isset( $link->type ) && $link->type === 'application/activity+json' ) {
$activity_profile['href'] = $link->href;
$activity_profile['name'] = $webfinger;
}
}
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}
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}
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return $activity_profile;
}
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}