Caldav import less strict than output on UID handling

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Hi,

is this a known issue with somebody working on it? Didn't find anything
on the tracker.

A user repeatedly had issues with caldav sync to android erroring.
Exporting/importing the whole calendar fixed it temporarily.
The user works with thunderbird and android via caldav to the horde
backend. Horde and kronolith are essentially git master from 12/2018.

We have narrowed down the issue:

He got an invitation from an exchange user. He accepted via Thunderbird,
which in turn pushed the event to the server.

Horde offered the new event via caldav as

/rpc/calendars/thatuser/calendar:KU0qE1cPK8GdcNjVSR68WQ8/%257b0A748907-A0A5-4F3D-A5D4-D4E1F221C1B1%257d.ics

The uid in the file is

UID:{0A748907-A0A5-4F3D-A5D4-D4E1F221C1B1}

Seems like the braces are url-expanded and then most likely url
expansion happens again at some point (on the %) when trying to fetch it.

However, trying to access that URL yielded a 404.

I will try to narrow this next and then open a bug with a reproducer.


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