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diff --git a/lib/public/Security/ITrustedDomainHelper.php b/lib/public/Security/ITrustedDomainHelper.php
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+++ b/lib/public/Security/ITrustedDomainHelper.php
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+<?php
+
+declare(strict_types=1);
+/**
+ * @copyright Copyright (c) 2021 Joas Schilling <coding@schilljs.com>
+ *
+ * @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 <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace OCP\Security;
+
+/**
+ * Allows checking domains and full URLs against the list of trusted domains for
+ * this server in the config file.
+ *
+ * @package OCP\Security
+ * @since 23.0.0
+ */
+interface ITrustedDomainHelper {
+	/**
+	 * Checks whether a given URL is considered as trusted from the list
+	 * of trusted domains in the server's config file. If no trusted domains
+	 * have been configured and the url is valid, returns true.
+	 *
+	 * @param string $url
+	 * @return bool
+	 * @since 23.0.0
+	 */
+	public function isTrustedUrl(string $url): bool;
+
+	/**
+	 * Checks whether a given domain is considered as trusted from the list
+	 * of trusted domains in the server's config file. If no trusted domains
+	 * have been configured, returns true.
+	 * This is used to prevent Host Header Poisoning.
+	 *
+	 * @param string $domainWithPort
+	 * @return bool
+	 * @since 23.0.0
+	 */
+	public function isTrustedDomain(string $domainWithPort): bool;
+}