API: First steps to support subscriptions

src/Model/Subscription.php

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+<?php
+/**
+ * @copyright Copyright (C) 2010-2021, the Friendica project
+ *
+ * @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\Model;
+
+use Friendica\Database\DBA;
+use Friendica\DI;
+use Friendica\Util\Crypto;
+
+class Subscription
+{
+	/**
+	 * Insert an Subscription record
+	 *
+	 * @param array $fields subscription fields
+	 *
+	 * @return bool result of replace
+	 */
+	public static function replace(array $fields)
+	{
+		return DBA::replace('subscription', $fields);
+	}
+
+	/**
+	 * Delete a subscription record
+	 * @param int $applicationid 
+	 * @param int $uid 
+	 * @return bool 
+	 */
+	public static function delete(int $applicationid, int $uid)
+	{
+		return DBA::delete('subscription', ['application-id' => $applicationid, 'uid' => $uid]);
+	}
+
+	/**
+	 * Fetch a VAPID key
+	 * @return string
+	 */
+	public static function getVapidKey():string
+	{
+		$keypair = DI::config()->get('system', 'ec_keypair');
+		if (empty($keypair)) {
+			$keypair = Crypto::newECKeypair();
+			DI::config()->set('system', 'ec_keypair', $keypair);
+		}
+		return $keypair['vapid'];
+	}
+}