1 files changed, 73 insertions, 0 deletions
diff --git a/lib/private/Security/CSP/ContentSecurityPolicyManager.php b/lib/private/Security/CSP/ContentSecurityPolicyManager.php
new file mode 100644
index 00000000000..760cd36e56b
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+++ b/lib/private/Security/CSP/ContentSecurityPolicyManager.php
@@ -0,0 +1,73 @@
+<?php
+/**
+ * @author Lukas Reschke <lukas@owncloud.com>
+ *
+ * @copyright Copyright (c) 2016, ownCloud, Inc.
+ * @license AGPL-3.0
+ *
+ * This code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * 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, version 3,
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+
+namespace OC\Security\CSP;
+
+use OCP\AppFramework\Http\ContentSecurityPolicy;
+use OCP\AppFramework\Http\EmptyContentSecurityPolicy;
+use OCP\Security\IContentSecurityPolicyManager;
+
+class ContentSecurityPolicyManager implements IContentSecurityPolicyManager {
+	/** @var ContentSecurityPolicy[] */
+	private $policies = [];
+
+	/** {@inheritdoc} */
+	public function addDefaultPolicy(EmptyContentSecurityPolicy $policy) {
+		$this->policies[] = $policy;
+	}
+
+	/**
+	 * Get the configured default policy. This is not in the public namespace
+	 * as it is only supposed to be used by core itself.
+	 *
+	 * @return ContentSecurityPolicy
+	 */
+	public function getDefaultPolicy() {
+		$defaultPolicy = new \OC\Security\CSP\ContentSecurityPolicy();
+		foreach($this->policies as $policy) {
+			$defaultPolicy = $this->mergePolicies($defaultPolicy, $policy);
+		}
+		return $defaultPolicy;
+	}
+
+	/**
+	 * Merges the first given policy with the second one
+	 *
+	 * @param ContentSecurityPolicy $defaultPolicy
+	 * @param EmptyContentSecurityPolicy $originalPolicy
+	 * @return ContentSecurityPolicy
+	 */
+	public function mergePolicies(ContentSecurityPolicy $defaultPolicy,
+								  EmptyContentSecurityPolicy $originalPolicy) {
+		foreach((object)(array)$originalPolicy as $name => $value) {
+			$setter = 'set'.ucfirst($name);
+			if(is_array($value)) {
+				$getter = 'get'.ucfirst($name);
+				$currentValues = is_array($defaultPolicy->$getter()) ? $defaultPolicy->$getter() : [];
+				$defaultPolicy->$setter(array_values(array_unique(array_merge($currentValues, $value))));
+			} elseif (is_bool($value)) {
+				$defaultPolicy->$setter($value);
+			}
+		}
+
+		return $defaultPolicy;
+	}
+}