modified file plugins

wp-content/upgrade-temp-backup/plugins/activitypub/includes/class-webfinger.php

@@ -0,0 +1,84 @@
+<?php
+namespace Activitypub;
+
+/**
+ * ActivityPub WebFinger Class
+ *
+ * @author Matthias Pfefferle
+ *
+ * @see https://webfinger.net/
+ */
+class Webfinger {
+	/**
+	 * Returns a users WebFinger "resource"
+	 *
+	 * @param int $user_id
+	 *
+	 * @return string The user-resource
+	 */
+	public static function get_user_resource( $user_id ) {
+		// use WebFinger plugin if installed
+		if ( \function_exists( '\get_webfinger_resource' ) ) {
+			return \get_webfinger_resource( $user_id, false );
+		}
+
+		$user = \get_user_by( 'id', $user_id );
+
+		return $user->user_login . '@' . \wp_parse_url( \home_url(), \PHP_URL_HOST );
+	}
+
+	public static function resolve( $account ) {
+		if ( ! preg_match( '/^@?' . ACTIVITYPUB_USERNAME_REGEXP . '$/i', $account, $m ) ) {
+			return null;
+		}
+		$transient_key = 'activitypub_resolve_' . ltrim( $account, '@' );
+
+		$link = \get_transient( $transient_key );
+		if ( $link ) {
+			return $link;
+		}
+
+		$url = \add_query_arg( 'resource', 'acct:' . ltrim( $account, '@' ), 'https://' . $m[2] . '/.well-known/webfinger' );
+		if ( ! \wp_http_validate_url( $url ) ) {
+			$response = new \WP_Error( 'invalid_webfinger_url', null, $url );
+			\set_transient( $transient_key, $response, HOUR_IN_SECONDS ); // Cache the error for a shorter period.
+			return $response;
+		}
+
+		// try to access author URL
+		$response = \wp_remote_get(
+			$url,
+			array(
+				'headers' => array( 'Accept' => 'application/activity+json' ),
+				'redirection' => 0,
+				'timeout' => 2,
+			)
+		);
+
+		if ( \is_wp_error( $response ) ) {
+			$link = new \WP_Error( 'webfinger_url_not_accessible', null, $url );
+			\set_transient( $transient_key, $link, HOUR_IN_SECONDS ); // Cache the error for a shorter period.
+			return $link;
+		}
+
+		$body = \wp_remote_retrieve_body( $response );
+		$body = \json_decode( $body, true );
+
+		if ( empty( $body['links'] ) ) {
+			$link = new \WP_Error( 'webfinger_url_invalid_response', null, $url );
+			\set_transient( $transient_key, $link, HOUR_IN_SECONDS ); // Cache the error for a shorter period.
+			return $link;
+		}
+
+		foreach ( $body['links'] as $link ) {
+			if ( 'self' === $link['rel'] && 'application/activity+json' === $link['type'] ) {
+				\set_transient( $transient_key, $link['href'], WEEK_IN_SECONDS );
+				return $link['href'];
+			}
+		}
+
+		$link = new \WP_Error( 'webfinger_url_no_activity_pub', null, $body );
+		\set_transient( $transient_key, $link, HOUR_IN_SECONDS ); // Cache the error for a shorter period.
+		return $link;
+	}
+}