From bd1f98cba37ceb6c0d07a1d5764ec4eb22f369ed Mon Sep 17 00:00:00 2001
From: Georg Ehrke <developer@georgehrke.com>
Date: Mon, 16 Mar 2020 15:04:21 +0100
Subject: [PATCH] RefreshWebcalService: randomly generate calendar-object uri

Signed-off-by: Georg Ehrke <developer@georgehrke.com>
---
 .../CalDAV/WebcalCaching/RefreshWebcalService.php  | 14 +++++++++++---
 .../WebcalCaching/RefreshWebcalServiceTest.php     | 12 +++++++++---
 2 files changed, 20 insertions(+), 6 deletions(-)

diff --git a/apps/dav/lib/CalDAV/WebcalCaching/RefreshWebcalService.php b/apps/dav/lib/CalDAV/WebcalCaching/RefreshWebcalService.php
index beab0271d8..a057e29eb2 100644
--- a/apps/dav/lib/CalDAV/WebcalCaching/RefreshWebcalService.php
+++ b/apps/dav/lib/CalDAV/WebcalCaching/RefreshWebcalService.php
@@ -47,6 +47,7 @@ use Sabre\VObject\InvalidDataException;
 use Sabre\VObject\ParseException;
 use Sabre\VObject\Reader;
 use Sabre\VObject\Splitter\ICalendar;
+use Sabre\VObject\UUIDUtil;
 use function count;
 
 class RefreshWebcalService {
@@ -113,7 +114,6 @@ class RefreshWebcalService {
 
 			while ($vObject = $splitter->getNext()) {
 				/** @var Component $vObject */
-				$uid = null;
 				$compName = null;
 
 				foreach ($vObject->getComponents() as $component) {
@@ -121,7 +121,6 @@ class RefreshWebcalService {
 						continue;
 					}
 
-					$uid = $component->{'UID'}->getValue();
 					$compName = $component->name;
 
 					if ($stripAlarms) {
@@ -136,7 +135,7 @@ class RefreshWebcalService {
 					continue;
 				}
 
-				$uri = $uid . '.ics';
+				$uri = $this->getRandomCalendarObjectUri();
 				$calendarData = $vObject->serialize();
 				try {
 					$this->calDavBackend->createCalendarObject($subscription['id'], $uri, $calendarData, CalDavBackend::CALENDAR_TYPE_SUBSCRIPTION);
@@ -413,4 +412,13 @@ class RefreshWebcalService {
 
 		return $cleanURL;
 	}
+
+	/**
+	 * Returns a random uri for a calendar-object
+	 *
+	 * @return string
+	 */
+	public function getRandomCalendarObjectUri():string {
+		return UUIDUtil::getUUID() . '.ics';
+	}
 }
diff --git a/apps/dav/tests/unit/CalDAV/WebcalCaching/RefreshWebcalServiceTest.php b/apps/dav/tests/unit/CalDAV/WebcalCaching/RefreshWebcalServiceTest.php
index 01e541ec20..b1d341c2e4 100644
--- a/apps/dav/tests/unit/CalDAV/WebcalCaching/RefreshWebcalServiceTest.php
+++ b/apps/dav/tests/unit/CalDAV/WebcalCaching/RefreshWebcalServiceTest.php
@@ -69,8 +69,14 @@ class RefreshWebcalServiceTest extends TestCase {
 	 * @dataProvider runDataProvider
 	 */
 	public function testRun(string $body, string $contentType, string $result) {
-		$refreshWebcalService = new RefreshWebcalService($this->caldavBackend,
-			$this->clientService, $this->config, $this->logger);
+		$refreshWebcalService = $this->getMockBuilder(RefreshWebcalService::class)
+			->setMethods(['getRandomCalendarObjectUri'])
+			->setConstructorArgs([$this->caldavBackend, $this->clientService, $this->config, $this->logger])
+			->getMock();
+
+		$refreshWebcalService
+			->method('getRandomCalendarObjectUri')
+			->willReturn('uri-1.ics');
 
 		$this->caldavBackend->expects($this->once())
 			->method('getSubscriptionsForUser')
@@ -130,7 +136,7 @@ class RefreshWebcalServiceTest extends TestCase {
 
 		$this->caldavBackend->expects($this->once())
 			->method('createCalendarObject')
-			->with(42, '12345.ics', $result, 1);
+			->with(42, 'uri-1.ics', $result, 1);
 
 		$refreshWebcalService->refreshSubscription('principals/users/testuser', 'sub123');
 	}