From 1958bde4c0739f14c46c00195a9892329350535b Mon Sep 17 00:00:00 2001
From: Michael <heluecht@pirati.ca>
Date: Tue, 10 Dec 2019 21:27:09 +0000
Subject: [PATCH] API: Added endpoints /instance and /instance/peers

---
 doc/API-Mastodon.md                        |  2 +
 src/Module/Api/Mastodon/Instance.php       | 74 ++++++++++++++++++++++
 src/Module/Api/Mastodon/Instance/Peers.php | 41 ++++++++++++
 static/routes.config.php                   |  2 +
 4 files changed, 119 insertions(+)
 create mode 100644 src/Module/Api/Mastodon/Instance.php
 create mode 100644 src/Module/Api/Mastodon/Instance/Peers.php

diff --git a/doc/API-Mastodon.md b/doc/API-Mastodon.md
index d885e6ab3c..a711e367fb 100644
--- a/doc/API-Mastodon.md
+++ b/doc/API-Mastodon.md
@@ -16,6 +16,8 @@ These endpoints use the [Mastodon API entities](https://docs.joinmastodon.org/ap
 ## Implemented endpoints
 
 - [GET /api/v1/follow_requests](https://docs.joinmastodon.org/api/rest/follow-requests/#get-api-v1-follow-requests)
+- [GET /api/v1/instance](https://docs.joinmastodon.org/api/rest/instances)
+- GET /api/v1/instance/peers - undocumented, but implemented by Mastodon and Pleroma
 
 ## Non-implemented endpoints
 
diff --git a/src/Module/Api/Mastodon/Instance.php b/src/Module/Api/Mastodon/Instance.php
new file mode 100644
index 0000000000..f6f2657448
--- /dev/null
+++ b/src/Module/Api/Mastodon/Instance.php
@@ -0,0 +1,74 @@
+<?php
+
+namespace Friendica\Module\Api\Mastodon;
+
+use Friendica\Core\Config;
+use Friendica\Core\Protocol;
+use Friendica\Core\System;
+use Friendica\Database\DBA;
+use Friendica\Model\User;
+use Friendica\Module\Base\Api;
+use Friendica\Module\Register;
+use Friendica\Network\HTTPException;
+use Friendica\Util\Network;
+
+/**
+ * @see https://docs.joinmastodon.org/api/rest/instances/
+ */
+class Instance extends Api
+{
+	public static function init(array $parameters = [])
+	{
+		parent::init($parameters);
+	}
+
+	/**
+	 * @param array $parameters
+	 * @throws HTTPException\InternalServerErrorException
+	 */
+	public static function rawContent(array $parameters = [])
+	{
+		$app = self::getApp();
+
+                $register_policy = intval(Config::get('config', 'register_policy'));
+
+		$return = [
+			'uri' => $app->getBaseURL(),
+			'title' => Config::get('config', 'sitename'),
+			'short_description' => '', // Not supported
+			'description' => Config::get('config', 'info'),
+			'email' => Config::get('config', 'admin_email'),
+			'version' => FRIENDICA_VERSION,
+			'urls' => [], // Not supported
+			'stats' => [],
+			'thumbnail' => $app->getBaseURL() . (Config::get('system', 'shortcut_icon') ?? 'images/friendica-32.png'),
+			'languages' => [Config::get('system', 'language')],
+			'registrations' => ($register_policy != Register::CLOSED),
+			'approval_required' => ($register_policy == Register::APPROVE),
+			'contact_account' => [] // Currently unsupported
+		];
+
+		if (!empty(Config::get('system', 'nodeinfo'))) {
+			$count = DBA::count('gserver', ["`network` in (?, ?) AND `last_contact` >= `last_failure`", Protocol::DFRN, Protocol::ACTIVITYPUB]);
+			$return['stats'] = [
+				'user_count' => intval(Config::get('nodeinfo', 'total_users')),
+				'status_count' => Config::get('nodeinfo', 'local_posts') + Config::get('nodeinfo', 'local_comments'),
+				'domain_count' => $count
+			];
+		}
+
+		/// @ToDo will be done, once that we have an API function for that
+		/*
+		if (!empty(Config::get('config', 'admin_email'))) {
+			$adminList = explode(',', str_replace(' ', '', Config::get('config', 'admin_email')));
+			$administrator = User::getByEmail($adminList[0], ['nickname']);
+			if (!empty($administrator)) {
+				$adminContact = DBA::selectFirst('contact', [], ['nick' => $administrator['nickname'], 'self' => true]);
+				$return['contact_account'] = Api::getAccountArray($adminContact);
+			}
+		}
+		*/
+
+		System::jsonExit($return);
+	}
+}
diff --git a/src/Module/Api/Mastodon/Instance/Peers.php b/src/Module/Api/Mastodon/Instance/Peers.php
new file mode 100644
index 0000000000..4dc4f482e7
--- /dev/null
+++ b/src/Module/Api/Mastodon/Instance/Peers.php
@@ -0,0 +1,41 @@
+<?php
+
+namespace Friendica\Module\Api\Mastodon\Instance;
+
+use Friendica\Core\Protocol;
+use Friendica\Core\System;
+use Friendica\Database\DBA;
+use Friendica\Module\Base\Api;
+use Friendica\Network\HTTPException;
+use Friendica\Util\Network;
+
+/**
+ * Undocumented API endpoint that is implemented by both Mastodon and Pleroma
+ */
+class Peers extends Api
+{
+	public static function init(array $parameters = [])
+	{
+		parent::init($parameters);
+	}
+
+	/**
+	 * @param array $parameters
+	 * @throws HTTPException\InternalServerErrorException
+	 */
+	public static function rawContent(array $parameters = [])
+	{
+		$return = [];
+
+		// We only select for Friendica and ActivityPub servers, since it is expected to only deliver AP compatible systems here.
+		$instances = DBA::select('gserver', ['url'], ["`network` in (?, ?) AND `last_contact` >= `last_failure`", Protocol::DFRN, Protocol::ACTIVITYPUB]);
+		while ($instance = DBA::fetch($instances)) {
+			$urldata = parse_url($instance['url']);
+			unset($urldata['scheme']);
+			$return[] = ltrim(Network::unparseURL($urldata), '/');
+		}
+		DBA::close($instances);
+
+		System::jsonExit($return);
+	}
+}
diff --git a/static/routes.config.php b/static/routes.config.php
index d8113c5c53..824354690d 100644
--- a/static/routes.config.php
+++ b/static/routes.config.php
@@ -30,6 +30,8 @@ return [
 	'/api' => [
 		'/v1' => [
 			'/follow_requests'                   => [Module\Api\Mastodon\FollowRequests::class, [R::GET         ]],
+			'/instance'                          => [Module\Api\Mastodon\Instance::class, [R::GET]],
+			'/instance/peers'                    => [Module\Api\Mastodon\Instance\Peers::class, [R::GET]],
 		],
 	],
 
-- 
2.39.5