Add feature policy header

This adds the events and the classes to modify the feature policy.
It also adds a default restricted feature policy.

Signed-off-by: Roeland Jago Douma <roeland@famdouma.nl>

2 files changed, 152 insertions, 0 deletions

diff --git a/lib/private/Security/FeaturePolicy/FeaturePolicy.php b/lib/private/Security/FeaturePolicy/FeaturePolicy.php
new file mode 100644
index 00000000000..bcfb02bf7c2
--- /dev/null
+++ b/lib/private/Security/FeaturePolicy/FeaturePolicy.php
@@ -0,0 +1,76 @@
+<?php
+declare(strict_types=1);
+/**
+ * @copyright Copyright (c) 2019, 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 OC\Security\FeaturePolicy;
+
+class FeaturePolicy extends \OCP\AppFramework\Http\FeaturePolicy {
+
+	public function getAutoplayDomains(): array {
+		return $this->autoplayDomains;
+	}
+
+	public function setAutoplayDomains(array $autoplayDomains): void {
+		$this->autoplayDomains = $autoplayDomains;
+	}
+
+	public function getCameraDomains(): array {
+		return $this->cameraDomains;
+	}
+
+	public function setCameraDomains(array $cameraDomains): void {
+		$this->cameraDomains = $cameraDomains;
+	}
+
+	public function getFullscreenDomains(): array {
+		return $this->fullscreenDomains;
+	}
+
+	public function setFullscreenDomains(array $fullscreenDomains): void {
+		$this->fullscreenDomains = $fullscreenDomains;
+	}
+
+	public function getGeolocationDomains(): array {
+		return $this->geolocationDomains;
+	}
+
+	public function setGeolocationDomains(array $geolocationDomains): void {
+		$this->geolocationDomains = $geolocationDomains;
+	}
+
+	public function getMicrophoneDomains(): array {
+		return $this->microphoneDomains;
+	}
+
+	public function setMicrophoneDomains(array $microphoneDomains): void {
+		$this->microphoneDomains = $microphoneDomains;
+	}
+
+	public function getPaymentDomains(): array {
+		return $this->paymentDomains;
+	}
+
+	public function setPaymentDomains(array $paymentDomains): void {
+		$this->paymentDomains = $paymentDomains;
+	}
+}
diff --git a/lib/private/Security/FeaturePolicy/FeaturePolicyManager.php b/lib/private/Security/FeaturePolicy/FeaturePolicyManager.php
new file mode 100644
index 00000000000..d5b04a6c16b
--- /dev/null
+++ b/lib/private/Security/FeaturePolicy/FeaturePolicyManager.php
@@ -0,0 +1,76 @@
+<?php
+declare(strict_types=1);
+/**
+ * @copyright Copyright (c) 2019, 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 OC\Security\FeaturePolicy;
+
+use OCP\AppFramework\Http\EmptyFeaturePolicy;
+use OCP\EventDispatcher\IEventDispatcher;
+use OCP\Security\FeaturePolicy\AddFeaturePolicyEvent;
+
+class FeaturePolicyManager {
+	/** @var EmptyFeaturePolicy[] */
+	private $policies = [];
+
+	/** @var IEventDispatcher */
+	private $dispatcher;
+
+	public function __construct(IEventDispatcher $dispatcher) {
+		$this->dispatcher = $dispatcher;
+	}
+
+	public function addDefaultPolicy(EmptyFeaturePolicy $policy): void {
+		$this->policies[] = $policy;
+	}
+
+	public function getDefaultPolicy(): FeaturePolicy {
+		$event = new AddFeaturePolicyEvent($this);
+		$this->dispatcher->dispatch(AddFeaturePolicyEvent::class, $event);
+
+		$defaultPolicy = new FeaturePolicy();
+		foreach ($this->policies as $policy) {
+			$defaultPolicy = $this->mergePolicies($defaultPolicy, $policy);
+		}
+		return $defaultPolicy;
+	}
+
+	/**
+	 * Merges the first given policy with the second one
+	 *
+	 */
+	public function mergePolicies(FeaturePolicy $defaultPolicy,
+								  EmptyFeaturePolicy $originalPolicy): FeaturePolicy {
+		foreach ((object)(array)$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;
+	}
+}