[BUG] Synchronize with Confluence Team Calendar fails starting with v4.2.0.1

[Markus74a]

I'm trying to synchronize a Confluence Team Calendar to my Android 10 device.

When connecting with Davx5 v4.2.3.4, I am able to add the calendar by URL, username, password and Davx5 is able to retrieve the list of available team calendars. However, any synchronization attempt with any of these calendars fails with a HTTP 500 error.

I did some digging and found some older versions of Davx5 on the internet. I tried all of them ordered ascending by version. It turns out that up to v4.2 the synchronization process works fine, but starting with v4.2.0.1 I always receive HTTP 500 errors, up to the current version v4.2.3.4.

I installed a man-in-the-middle proxy to capture the PROPFIND requests made by the different versions:

v4.2 and before:

<?xml version='1.0' encoding='UTF-8' ?>
<propfind xmlns="DAV:"
          xmlns:CAL="urn:ietf:params:xml:ns:caldav"
          xmlns:CARD="urn:ietf:params:xml:ns:carddav">
	<prop>
		<supported-report-set/>
		<n0:getctag xmlns:n0="http://calendarserver.org/ns/"/>
		<sync-token/>
	</prop>
</propfind>

v4.2.0.1 and after:

<?xml version='1.0' encoding='UTF-8' ?>
<propfind xmlns="DAV:"
          xmlns:CAL="urn:ietf:params:xml:ns:caldav"
          xmlns:CARD="urn:ietf:params:xml:ns:carddav">
	<prop>
		<CAL:max-resource-size/>
		<supported-report-set/>
		<n0:getctag xmlns:n0="http://calendarserver.org/ns/"/>
		<sync-token/>
	</prop>
</propfind>

The HTTP headers are identical in all versions and the only difference in the HTTP body is the additional <CAL:max-resource-size/>. For some reason, the additional property causes a HTTP 500 error.

Comparing the 4.2 and 4.2.0.1 tags, it seems a different version of the dav4jvm library is used, which changes the propfind() method to include an additional parameter MaxVCardSize.NAME. So the bug probably related to the code introduced in this commit.

[rfc2822]

Hello,

Thanks for providing all the info.

The request is correct (and yes, we now query the max resource size).

If this is a problem for a specific server, please fix/report it there because it's a server problem (which is also indicated by error code 500 which means Internal server error).

I would be happy if you could report it there (service side) and provide some kind of reference here (ticket ID, ...) so if the problem occurs again we can refer to it.

[yanickxia]

confluence 8.5.15 still problem, i try recomplie 4.0-ose, it's works..
server without any logs( confluence not opensource)

see davx5 log is

2024-11-18 15:13:39 619 Adding Basic authorization header for https://confluence/plugins/servlet/team-calendars/caldav/4cdce811-e468-4c7c-82b9-25193189eab3/
2024-11-18 15:13:40 619 [.network.HttpClient]         <-- 500 https://confluence/plugins/servlet/team-calendars/caldav/4cdce811-e468-4c7c-82b9-25193189eab3/ (615ms)
2024-11-18 15:13:40 619 [.network.HttpClient]         allow: HEAD, MKCOL, PROPFIND, ACL, COPY, REPORT, OPTIONS, PUT, DELETE, MKCALENDAR, MOVE, GET, PROPPATCH
2024-11-18 15:13:40 619 [.network.HttpClient]         content-language: zh-CN
2024-11-18 15:13:40 619 [.network.HttpClient]         content-type: text/html;charset=UTF-8
2024-11-18 15:13:40 619 [.network.HttpClient]         date: Mon, 18 Nov 2024 07:13:40 GMT
2024-11-18 15:13:40 619 [.network.HttpClient]         dav: 1, 3, calendar-access, access-control, extended-mkcol
2024-11-18 15:13:40 619 [.network.HttpClient]         ms-author-via: DAV
2024-11-18 15:13:40 619 [.network.HttpClient]         server: nginx/1.27.2
2024-11-18 15:13:40 619 [.network.HttpClient]         set-cookie: JSESSIONID=xxxxxxx; Path=/; HttpOnly
2024-11-18 15:13:40 619 [.network.HttpClient]         x-ausername: yanick
2024-11-18 15:13:40 619 [.network.HttpClient]         x-confluence-request-time: 1731914020294
2024-11-18 15:13:40 619 [.network.HttpClient]         x-seraph-loginreason: OK
2024-11-18 15:13:40 619 [.network.HttpClient]         

2024-11-18 15:13:40 619 [.network.HttpClient]         <-- END HTTP (42751-byte body)
2024-11-18 15:13:40 619 [.sync.SyncManager]           HTTP/DAV exception
	EXCEPTION at.bitfire.dav4jvm.exception.HttpException: HTTP 500 
		at at.bitfire.dav4jvm.DavResource.checkStatus(DavResource.kt:3)
		at at.bitfire.dav4jvm.DavResource.checkStatus(DavResource.kt:1)
		at at.bitfire.dav4jvm.DavResource.processMultiStatus(DavResource.kt:2)
		at at.bitfire.dav4jvm.DavResource.propfind(DavResource.kt:76)
		at at.bitfire.davdroid.sync.CalendarSyncManager.queryCapabilities$lambda$3(CalendarSyncManager.kt:30)
		at at.bitfire.davdroid.sync.CalendarSyncManager.$r8$lambda$WgZpb3kEDaQ7fxdsisoeL5kAHSU(CalendarSyncManager.kt:1)
		at at.bitfire.davdroid.sync.CalendarSyncManager$$ExternalSyntheticLambda8.invoke(R8$$SyntheticClass:3)
		at at.bitfire.davdroid.sync.SyncException$Companion.wrapWithRemoteResource(SyncException.kt:6)
		at at.bitfire.davdroid.sync.CalendarSyncManager.queryCapabilities(CalendarSyncManager.kt:16)
		at at.bitfire.davdroid.sync.SyncManager.performSync(SyncManager.kt:73)
		at at.bitfire.davdroid.sync.CalendarSyncer.syncCollection(CalendarSyncer.kt:11)
		at at.bitfire.davdroid.sync.CalendarSyncer.syncCollection(CalendarSyncer.kt:1)
		at at.bitfire.davdroid.sync.Syncer.syncCollectionContents$davx5_ose_4_4_3_2_oseRelease(Syncer.kt:59)
		at at.bitfire.davdroid.sync.Syncer.sync$davx5_ose_4_4_3_2_oseRelease(Syncer.kt:36)
		at at.bitfire.davdroid.sync.Syncer.invoke(Syncer.kt:147)
		at at.bitfire.davdroid.sync.worker.BaseSyncWorker$doSyncWork$2.invokeSuspend$lambda$0(BaseSyncWorker.kt:1)
		at at.bitfire.davdroid.sync.worker.BaseSyncWorker$doSyncWork$2.$r8$lambda$MnrEU1_WtQZTTPjmMRztfG3Y7fo(BaseSyncWorker.kt:1)
		at at.bitfire.davdroid.sync.worker.BaseSyncWorker$doSyncWork$2$$ExternalSyntheticLambda0.invoke(R8$$SyntheticClass:3)
		at kotlinx.coroutines.InterruptibleKt$runInterruptible$2.invokeSuspend(Interruptible.kt:58)
		at kotlinx.coroutines.InterruptibleKt$runInterruptible$2.invoke(Interruptible.kt:13)
		at kotlinx.coroutines.intrinsics.UndispatchedKt.startUndispatchedOrReturn(Undispatched.kt:5)
		at kotlinx.coroutines.BuildersKt.withContext(Unknown Source:44)
		at kotlinx.coroutines.InterruptibleKt.runInterruptible$default(Interruptible.kt:9)
		at at.bitfire.davdroid.sync.worker.BaseSyncWorker$doSyncWork$2.invokeSuspend(BaseSyncWorker.kt:325)
		at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:9)
		at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:107)
		at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
		at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:644)
		at java.lang.Thread.run(Thread.java:1012)

[rfc2822]

Is this reported to the server? It should be fixed there.

[yanickxia]

OK, i try report to conflence server, but seem some app works,

• MI Calendar: works
• Realme Calender: not work
• Google Calendar: works

[rfc2822]

I don't have experience with that, but I created a mydomain.atlassian.net trial and added an event to my personal calendar.

I synced this event (had to create a token for authentication) with current DAVx5 and there was no problem. It has PRODID:-//Atlassian Confluence//Calendar Plugin 1.0//EN.

During the capabilities check, the server returned

<max-resource-size>null</max-resource-size>

which is invalid (it should be <max-resource-size/> with code 404), but it was ignored by DAVx5.

So if there's still a problem, I suggest to update both the server and DAVx5 to the latest version and it should work.

[yanickxia]

Thanks, I'm sure that confluence bug, already ticket it for them.