70 lines
1.8 KiB
PHP
70 lines
1.8 KiB
PHP
<?php
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namespace Activitypub;
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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 = \get_user_by( 'id', $user_id );
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return $user->user_login . '@' . \wp_parse_url( \home_url(), \PHP_URL_HOST );
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}
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public static function resolve( $account ) {
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if ( ! preg_match( '/^@?[^@]+@((?:[a-z0-9-]+\.)+[a-z]+)$/i', $account, $m ) ) {
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return null;
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}
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$url = \add_query_arg( 'resource', 'acct:' . ltrim( $account, '@' ), 'https://' . $m[1] . '/.well-known/webfinger' );
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if ( ! \wp_http_validate_url( $url ) ) {
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return new \WP_Error( 'invalid_webfinger_url', null, $url );
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}
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// try to access author URL
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$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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)
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);
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if ( \is_wp_error( $response ) ) {
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return new \WP_Error( 'webfinger_url_not_accessible', null, $url );
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}
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$response_code = \wp_remote_retrieve_response_code( $response );
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$body = \wp_remote_retrieve_body( $response );
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$body = \json_decode( $body, true );
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if ( ! isset( $body['links'] ) ) {
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return new \WP_Error( 'webfinger_url_invalid_response', null, $url );
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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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return $link['href'];
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}
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}
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return new \WP_Error( 'webfinger_url_no_activity_pub', null, $body );
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}
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}
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