Implement Twitter contact endpoints

- Implement /followers/ids
- Implement /followers/list
- Reimplement /friends/ids
- Reimplement /friends/list
- Update API reference
- Remove obsolete tests

src/Module/Api/Twitter/FollowersList.php

@@ -0,0 +1,51 @@
+<?php
+/**
+ * @copyright Copyright (C) 2020, Friendica
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace Friendica\Module\Api\Twitter;
+
+use Friendica\Core\System;
+use Friendica\Model\Contact;
+
+/**
+ * @see https://developer.twitter.com/en/docs/accounts-and-users/follow-search-get-users/api-reference/get-followers-list
+ */
+class FollowersList extends ContactEndpoint
+{
+	public static function rawContent(array $parameters = [])
+	{
+		// Expected value for user_id parameter: public/user contact id
+		$contact_id  = $_GET['user_id'] ?? null;
+		$screen_name = $_GET['screen_name'] ?? null;
+		$cursor      = $_GET['cursor'] ?? $_GET['since_id'] ?? -1;
+		$count       = min((int) ($_GET['count'] ?? self::DEFAULT_COUNT), self::MAX_COUNT);
+		$skip_status = in_array(($_GET['skip_status'] ?? false), [true, 'true', 't', 1, '1']);
+		$include_user_entities = ($_GET['include_user_entities'] ?? 'true') != 'false';
+
+		System::jsonExit(self::list(
+			[Contact::FOLLOWER, Contact::FRIEND],
+			self::getUid($contact_id, $screen_name),
+			$cursor,
+			$count,
+			$skip_status,
+			$include_user_entities
+		));
+	}
+}