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diff --git a/lib/public/AppFramework/Http/StrictContentSecurityPolicy.php b/lib/public/AppFramework/Http/StrictContentSecurityPolicy.php
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+++ b/lib/public/AppFramework/Http/StrictContentSecurityPolicy.php
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+<?php
+declare(strict_types=1);
+/**
+ * @copyright 2018, Roeland Jago Douma <roeland@famdouma.nl>
+ *
+ * @author Roeland Jago Douma <roeland@famdouma.nl>
+ *
+ * @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\AppFramework\Http;
+
+/**
+ * Class StrictContentSecurityPolicy is a simple helper which allows applications to
+ * modify the Content-Security-Policy sent by Nextcloud. Per default only JavaScript,
+ * stylesheets, images, fonts, media and connections from the same domain
+ * ('self') are allowed.
+ *
+ * Even if a value gets modified above defaults will still get appended. Please
+ * notice that Nextcloud ships already with sensible defaults and those policies
+ * should require no modification at all for most use-cases.
+ *
+ * This class represents out strictest defaults. They may get change from release
+ * to release if more strict CSP directives become available.
+ *
+ * @package OCP\AppFramework\Http
+ * @since 14.0.0
+ */
+class StrictContentSecurityPolicy extends EmptyContentSecurityPolicy {
+	/** @var bool Whether inline JS snippets are allowed */
+	protected $inlineScriptAllowed = false;
+	/** @var bool Whether eval in JS scripts is allowed */
+	protected $evalScriptAllowed = false;
+	/** @var array Domains from which scripts can get loaded */
+	protected $allowedScriptDomains = [
+		'\'self\'',
+	];
+	/** @var bool Whether inline CSS is allowed */
+	protected $inlineStyleAllowed = false;
+	/** @var array Domains from which CSS can get loaded */
+	protected $allowedStyleDomains = [
+		'\'self\'',
+	];
+	/** @var array Domains from which images can get loaded */
+	protected $allowedImageDomains = [
+		'\'self\'',
+		'data:',
+		'blob:',
+	];
+	/** @var array Domains to which connections can be done */
+	protected $allowedConnectDomains = [
+		'\'self\'',
+	];
+	/** @var array Domains from which media elements can be loaded */
+	protected $allowedMediaDomains = [
+		'\'self\'',
+	];
+	/** @var array Domains from which object elements can be loaded */
+	protected $allowedObjectDomains = [];
+	/** @var array Domains from which iframes can be loaded */
+	protected $allowedFrameDomains = [];
+	/** @var array Domains from which fonts can be loaded */
+	protected $allowedFontDomains = [
+		'\'self\'',
+	];
+	/** @var array Domains from which web-workers and nested browsing content can load elements */
+	protected $allowedChildSrcDomains = [];
+
+	/** @var array Domains which can embed this Nextcloud instance */
+	protected $allowedFrameAncestors = [];
+}