Set etag for capabilities endpoint

Signed-off-by: Daniel Kesselberg <mail@danielkesselberg.de>

core/Controller/OCSController.php

@@ -108,7 +108,9 @@ class OCSController extends \OCP\AppFramework\OCSController {
 			$result['capabilities'] = $this->capabilitiesManager->getCapabilities(true);
 		}
 
-		return new DataResponse($result);
+		$response = new DataResponse($result);
+		$response->setETag(md5(json_encode($result)));
+		return $response;
 	}
 
 	/**

tests/Core/Controller/OCSControllerTest.php

@@ -113,6 +113,7 @@ class OCSControllerTest extends TestCase {
 		$result['capabilities'] = $capabilities;
 
 		$expected = new DataResponse($result);
+		$expected->setETag(md5(json_encode($result)));
 		$this->assertEquals($expected, $this->controller->getCapabilities());
 	}
 
@@ -146,6 +147,7 @@ class OCSControllerTest extends TestCase {
 		$result['capabilities'] = $capabilities;
 
 		$expected = new DataResponse($result);
+		$expected->setETag(md5(json_encode($result)));
 		$this->assertEquals($expected, $this->controller->getCapabilities());
 	}