added basic nodeinfo and webfinger support

activitypub.php

@@ -37,8 +37,14 @@ function activitypub_init() {
 	add_action( 'rest_api_init', array( 'Rest_Activitypub_Followers', 'register_routes' ) );
 
 	require_once dirname( __FILE__ ) . '/includes/class-rest-activitypub-webfinger.php';
+	add_action( 'rest_api_init', array( 'Rest_Activitypub_Webfinger', 'register_routes' ) );
 	add_action( 'webfinger_user_data', array( 'Rest_Activitypub_Webfinger', 'add_webfinger_discovery' ), 10, 3 );
 
+	require_once dirname( __FILE__ ) . '/includes/class-rest-activitypub-nodeinfo.php';
+	add_action( 'rest_api_init', array( 'Rest_Activitypub_Nodeinfo', 'register_routes' ) );
+	add_filter( 'nodeinfo_data', array( 'Rest_Activitypub_Nodeinfo', 'add_nodeinfo_discovery' ), 10, 2 );
+	add_filter( 'nodeinfo2_data', array( 'Rest_Activitypub_Nodeinfo', 'add_nodeinfo2_discovery' ), 10 );
+
 	// Configure activities
 	require_once dirname( __FILE__ ) . '/includes/class-activitypub-activities.php';
 	add_action( 'activitypub_inbox_follow', array( 'Activitypub_Activities', 'accept' ), 10, 2 );
@@ -46,3 +52,28 @@ function activitypub_init() {
 	add_action( 'activitypub_inbox_unfollow', array( 'Activitypub_Activities', 'unfollow' ), 10, 2 );
 }
 add_action( 'plugins_loaded', 'activitypub_init' );
+
+/**
+ * Add rewrite rules
+ */
+function activitypub_add_rewrite_rules() {
+	if ( ! class_exists( 'Webfinger' ) ) {
+		add_rewrite_rule( '^.well-known/webfinger', 'index.php?rest_route=/activitypub/1.0/webfinger', 'top' );
+	}
+
+	if ( ! class_exists( 'Nodeinfo' ) ) {
+		add_rewrite_rule( '^.well-known/nodeinfo', 'index.php?rest_route=/activitypub/1.0/nodeinfo/discovery', 'top' );
+		add_rewrite_rule( '^.well-known/x-nodeinfo2', 'index.php?rest_route=/activitypub/1.0/nodeinfo2', 'top' );
+	}
+}
+add_action( 'init', 'activitypub_add_rewrite_rules', 1 );
+
+/**
+ * Flush rewrite rules;
+ */
+function activitypub_flush_rewrite_rules() {
+	activitypub_add_rewrite_rules();
+	flush_rewrite_rules();
+}
+register_activation_hook( __FILE__, 'activitypub_flush_rewrite_rules' );
+register_deactivation_hook( __FILE__, 'flush_rewrite_rules' );

includes/class-rest-activitypub-nodeinfo.php

@@ -0,0 +1,162 @@
+<?php
+
+class Rest_Activitypub_Nodeinfo {
+	/**
+	 * Register routes
+	 */
+	public static function register_routes() {
+		register_rest_route(
+			'activitypub/1.0', '/nodeinfo/discovery', array(
+				array(
+					'methods'  => WP_REST_Server::READABLE,
+					'callback' => array( 'Rest_Activitypub_Nodeinfo', 'discovery' ),
+				),
+			)
+		);
+
+		register_rest_route(
+			'activitypub/1.0', '/nodeinfo', array(
+				array(
+					'methods'  => WP_REST_Server::READABLE,
+					'callback' => array( 'Rest_Activitypub_Nodeinfo', 'nodeinfo' ),
+				),
+			)
+		);
+
+		register_rest_route(
+			'activitypub/1.0', '/nodeinfo2', array(
+				array(
+					'methods'  => WP_REST_Server::READABLE,
+					'callback' => array( 'Rest_Activitypub_Nodeinfo', 'nodeinfo2' ),
+				),
+			)
+		);
+	}
+
+	/**
+	 * Render NodeInfo file
+	 *
+	 * @param  WP_REST_Request   $request
+	 * @return WP_REST_Response
+	 */
+	public static function nodeinfo( $request ) {
+		$nodeinfo = array();
+
+		$nodeinfo['version'] = '2.0';
+		$nodeinfo['software'] = array(
+			'name' => 'wordpress',
+			'version' => get_bloginfo( 'version' ),
+		);
+
+		$users = count_users();
+		$posts = wp_count_posts();
+		$comments = wp_count_comments();
+
+		$nodeinfo['usage'] = array(
+			'users' => array(
+				'total' => (int) $users['total_users'],
+			),
+			'localPosts' => (int) $posts->publish,
+			'localComments' => (int) $comments->approved,
+		);
+
+		$nodeinfo['openRegistrations'] = false;
+		$nodeinfo['protocols'] = array('activitypub');
+
+		$nodeinfo['services'] = array(
+			'inbound' => array(),
+			'outbound' => array(),
+		);
+
+		$nodeinfo['metadata'] = new stdClass;
+
+		return new WP_REST_Response( $nodeinfo, 200 );
+	}
+
+	/**
+	 * Render NodeInfo file
+	 *
+	 * @param  WP_REST_Request   $request
+	 * @return WP_REST_Response
+	 */
+	public static function nodeinfo2( $request ) {
+		$nodeinfo = array();
+
+		$nodeinfo['version'] = '1.0';
+		$nodeinfo['software'] = array(
+			'baseUrl' => home_url( '/' ),
+			'name' => get_bloginfo( 'name' ),
+			'software' => 'wordpress',
+			'version' => get_bloginfo( 'version' ),
+		);
+
+		$users = count_users();
+		$posts = wp_count_posts();
+		$comments = wp_count_comments();
+
+		$nodeinfo['usage'] = array(
+			'users' => array(
+				'total' => (int) $users['total_users'],
+			),
+			'localPosts' => (int) $posts->publish,
+			'localComments' => (int) $comments->approved,
+		);
+
+		$nodeinfo['openRegistrations'] = false;
+		$nodeinfo['protocols'] = array('activitypub');
+
+		$nodeinfo['services'] = array(
+			'inbound' => array(),
+			'outbound' => array(),
+		);
+
+		$nodeinfo['metadata'] = new stdClass;
+
+		return new WP_REST_Response( $nodeinfo, 200 );
+	}
+
+	/**
+	 * Render NodeInfo discovery file
+	 *
+	 * @param  WP_REST_Request   $request
+	 * @return WP_REST_Response
+	 */
+	public static function discovery( $request ) {
+		$discovery = array();
+		$discovery['links'] = array(
+			array(
+				'rel' => 'http://nodeinfo.diaspora.software/ns/schema/2.0',
+				'href' => get_rest_url( null, 'activitypub/1.0/nodeinfo' ),
+			),
+		);
+
+		return new WP_REST_Response( $discovery, 200 );
+	}
+
+	/**
+	 * Extend NodeInfo data
+	 *
+	 * @param array $nodeinfo NodeInfo data
+	 * @param array           updated data
+	 */
+	public static function add_nodeinfo_discovery( $nodeinfo, $version ) {
+		if ( '2.0' == $version) {
+			$nodeinfo['protocols'][] = 'activitypub';
+		} else {
+			$nodeinfo['protocols']['inbound'][] = 'activitypub';
+			$nodeinfo['protocols']['outbound'][] = 'activitypub';
+		}
+		return $nodeinfo;
+	}
+
+	/**
+	 * Extend NodeInfo2 data
+	 *
+	 * @param array $nodeinfo NodeInfo2 data
+	 * @param array           updated data
+	 */
+	public static function add_nodeinfo2_discovery( $nodeinfo ) {
+		$nodeinfo['protocols'][] = 'activitypub';
+		return $nodeinfo;
+	}
+}

includes/class-rest-activitypub-webfinger.php

@@ -1,6 +1,89 @@
 <?php
 
 class Rest_Activitypub_Webfinger {
+	/**
+	 * Register routes
+	 */
+	public static function register_routes() {
+		register_rest_route(
+			'activitypub/1.0', '/webfinger', array(
+				array(
+					'methods'  => WP_REST_Server::READABLE,
+					'callback' => array( 'Rest_Activitypub_Webfinger', 'webfinger' ),
+					'args'     => self::request_parameters(),
+				),
+			)
+		);
+	}
+
+	/**
+	 * Render JRD file
+	 *
+	 * @param  WP_REST_Request   $request
+	 * @return WP_REST_Response
+	 */
+	public static function webfinger( $request ) {
+		$resource = $request->get_param( 'resource' );
+
+		$matches = array();
+		$matched = preg_match( '/^acct:([^@]+)@(.+)$/', $resource, $matches );
+
+		if ( ! $matched ) {
+			return new WP_Error( 'activitypub_unsupported_resource', __( 'Resouce 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 ) {
+			return new WP_Error( 'activitypub_wrong_host', __( 'Resouce host does not match blog host', 'activitypub' ), array( 'status' => 404 ) );
+		}
+
+		$user = get_user_by( 'login', esc_sql( $resource_identifier ) );
+
+		if ( ! $user ) {
+			return new WP_Error( 'activitypub_user_not_found', __( 'User not found', 'activitypub' ), array( 'status' => 404 ) );
+		}
+
+		$json = array(
+			'subject' => $resource,
+			'aliases' => array(
+				get_author_posts_url( $user->ID ),
+			),
+			'links' => array(
+				array(
+					'rel'  => 'self',
+					'type' => 'application/activity+json',
+					'href' => get_author_posts_url( $user->ID ),
+				),
+				array(
+					'rel'  => 'http://webfinger.net/rel/profile-page',
+					'type' => 'text/html',
+					'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;
+	}
+
 	/**
 	 * Add WebFinger discovery links
 	 *

includes/functions.php

@@ -48,7 +48,7 @@ if ( ! function_exists( 'base64_url_encode' ) ) {
 	 * @return string the encoded text
 	 */
 	function base64_url_encode( $input ) {
-		return strtr( base64_encode( $input ), '+/', '-_' );
+		return strtr( base64_encode( $input ), '+/', '-_' ); // phpcs:ignore
 	}
 }
 if ( ! function_exists( 'base64_url_decode' ) ) {
@@ -60,7 +60,7 @@ if ( ! function_exists( 'base64_url_decode' ) ) {
 	 * @return string the decoded text
 	 */
 	function base64_url_decode( $input ) {
-		return base64_decode( strtr( $input, '-_', '+/' ) );
+		return base64_decode( strtr( $input, '-_', '+/' ) ); // phpcs:ignore
 	}
 }