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<?php |
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namespace Activitypub; |
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|
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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( $user_id, false ); |
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} |
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|
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$user = \get_user_by( 'id', $user_id ); |
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|
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return $user->user_login . '@' . \wp_parse_url( \home_url(), \PHP_URL_HOST ); |
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} |
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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, $url ); |
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} |
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|
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// try to access author URL |
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$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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|
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if ( \is_wp_error( $response ) ) { |
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return new \WP_Error( 'webfinger_url_not_accessible', null, $url ); |
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} |
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|
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$response_code = \wp_remote_retrieve_response_code( $response ); |
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|
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$body = \wp_remote_retrieve_body( $response ); |
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$body = \json_decode( $body, true ); |
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|
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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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|
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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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|
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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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|
