API: Added endpoints /instance and /instance/peers

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);
+	}
+}