From a0471a9eefd64d61925136d09d413b5bf0a918c7 Mon Sep 17 00:00:00 2001
From: Matthias Pfefferle <pfefferle@gmail.com>
Date: Tue, 12 Mar 2019 22:20:04 +0100
Subject: [PATCH] added following endpoint

---
 activitypub.php                   |  3 +
 includes/rest/class-following.php | 98 +++++++++++++++++++++++++++++++
 2 files changed, 101 insertions(+)
 create mode 100644 includes/rest/class-following.php

diff --git a/activitypub.php b/activitypub.php
index 3b206da..aed4feb 100644
--- a/activitypub.php
+++ b/activitypub.php
@@ -42,6 +42,9 @@ function init() {
 	require_once dirname( __FILE__ ) . '/includes/rest/class-followers.php';
 	\Activitypub\Rest\Followers::init();
 
+	require_once dirname( __FILE__ ) . '/includes/rest/class-following.php';
+	\Activitypub\Rest\Following::init();
+
 	require_once dirname( __FILE__ ) . '/includes/rest/class-webfinger.php';
 	\Activitypub\Rest\Webfinger::init();
 
diff --git a/includes/rest/class-following.php b/includes/rest/class-following.php
new file mode 100644
index 0000000..232ba47
--- /dev/null
+++ b/includes/rest/class-following.php
@@ -0,0 +1,98 @@
+<?php
+namespace Activitypub\Rest;
+
+/**
+ * ActivityPub Following REST-Class
+ *
+ * @author Matthias Pfefferle
+ *
+ * @see https://www.w3.org/TR/activitypub/#following
+ */
+class Following {
+	/**
+	 * Initialize the class, registering WordPress hooks
+	 */
+	public static function init() {
+		add_action( 'rest_api_init', array( '\Activitypub\Rest\Following', 'register_routes' ) );
+	}
+
+	/**
+	 * Register routes
+	 */
+	public static function register_routes() {
+		register_rest_route(
+			'activitypub/1.0', '/users/(?P<id>\d+)/following', array(
+				array(
+					'methods'  => \WP_REST_Server::READABLE,
+					'callback' => array( '\Activitypub\Rest\Following', 'get' ),
+					'args'     => self::request_parameters(),
+				),
+			)
+		);
+	}
+
+	/**
+	 * Handle GET request
+	 *
+	 * @param  WP_REST_Request   $request
+	 *
+	 * @return WP_REST_Response
+	 */
+	public static function get( $request ) {
+		$user_id = $request->get_param( 'id' );
+		$user    = get_user_by( 'ID', $user_id );
+
+		if ( ! $user ) {
+			return new \WP_Error( 'rest_invalid_param', __( 'User not found', 'activitypub' ), array(
+				'status' => 404,
+				'params' => array(
+					'user_id' => __( 'User not found', 'activitypub' ),
+				),
+			) );
+		}
+
+		$page = $request->get_param( 'page', 0 );
+
+		/*
+		 * Action triggerd prior to the ActivityPub profile being created and sent to the client
+		 */
+		do_action( 'activitypub_outbox_pre' );
+
+		$json = new \stdClass();
+
+		$json->{'@context'} = \Activitypub\get_context();
+
+		$json->partOf = get_rest_url( null, "/activitypub/1.0/users/$user_id/following" ); // phpcs:ignore
+		$json->totalItems = 0; // phpcs:ignore
+		$json->orderedItems = array(); // phpcs:ignore
+
+		$json->first = $json->partOf; // phpcs:ignore
+
+		$json->first = get_rest_url( null, "/activitypub/1.0/users/$user_id/following" );
+
+		$response = new \WP_REST_Response( $json, 200 );
+		$response->header( 'Content-Type', 'application/activity+json' );
+
+		return $response;
+	}
+
+	/**
+	 * The supported parameters
+	 *
+	 * @return array list of parameters
+	 */
+	public static function request_parameters() {
+		$params = array();
+
+		$params['page'] = array(
+			'type' => 'integer',
+		);
+
+		$params['id'] = array(
+			'required' => true,
+			'type' => 'integer',
+		);
+
+		return $params;
+	}
+}