97 lines
2.6 KiB
PHP
97 lines
2.6 KiB
PHP
<?php
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namespace Activitypub;
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use WP_Error;
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use Activitypub\Collection\Users;
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/**
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* ActivityPub WebFinger Class
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*
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* @author Matthias Pfefferle
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*
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* @see https://webfinger.net/
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*/
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class Webfinger {
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/**
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* Returns a users WebFinger "resource"
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*
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* @param int $user_id
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*
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* @return string The user-resource
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*/
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public static function get_user_resource( $user_id ) {
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// use WebFinger plugin if installed
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if ( \function_exists( '\get_webfinger_resource' ) ) {
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return \get_webfinger_resource( $user_id, false );
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}
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$user = Users::get_by_id( $user_id );
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if ( ! $user ) {
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return '';
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}
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return $user->get_resource();
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}
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/**
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* Resolve a WebFinger resource
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*
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* @param string $resource The WebFinger resource
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*
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* @return string|WP_Error The URL or WP_Error
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*/
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public static function resolve( $resource ) {
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if ( ! preg_match( '/^@?' . ACTIVITYPUB_USERNAME_REGEXP . '$/i', $resource, $m ) ) {
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return null;
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}
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$transient_key = 'activitypub_resolve_' . ltrim( $resource, '@' );
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$link = \get_transient( $transient_key );
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if ( $link ) {
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return $link;
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}
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$url = \add_query_arg( 'resource', 'acct:' . ltrim( $resource, '@' ), 'https://' . $m[2] . '/.well-known/webfinger' );
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if ( ! \wp_http_validate_url( $url ) ) {
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$response = new WP_Error( 'invalid_webfinger_url', null, $url );
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\set_transient( $transient_key, $response, HOUR_IN_SECONDS ); // Cache the error for a shorter period.
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return $response;
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}
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// try to access author URL
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$response = \wp_remote_get(
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$url,
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array(
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'headers' => array( 'Accept' => 'application/activity+json' ),
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'redirection' => 0,
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'timeout' => 2,
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)
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);
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if ( \is_wp_error( $response ) ) {
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$link = new WP_Error( 'webfinger_url_not_accessible', null, $url );
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\set_transient( $transient_key, $link, HOUR_IN_SECONDS ); // Cache the error for a shorter period.
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return $link;
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}
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$body = \wp_remote_retrieve_body( $response );
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$body = \json_decode( $body, true );
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if ( empty( $body['links'] ) ) {
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$link = new WP_Error( 'webfinger_url_invalid_response', null, $url );
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\set_transient( $transient_key, $link, HOUR_IN_SECONDS ); // Cache the error for a shorter period.
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return $link;
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}
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foreach ( $body['links'] as $link ) {
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if ( 'self' === $link['rel'] && 'application/activity+json' === $link['type'] ) {
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\set_transient( $transient_key, $link['href'], WEEK_IN_SECONDS );
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return $link['href'];
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}
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}
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$link = new WP_Error( 'webfinger_url_no_activitypub', null, $body );
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\set_transient( $transient_key, $link, HOUR_IN_SECONDS ); // Cache the error for a shorter period.
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return $link;
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}
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}
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