Add current_user_privilege_set attributes

[AntoineGirard]

Add current-user-privilege-set support

Add support for the current-user-privilege-set WebDAV property (RFC 3744), which exposes the authenticated user's privileges on a calendar (read, write, write-properties, etc.).

Cf : https://datatracker.ietf.org/doc/html/rfc3744#section-3.7

Changes

• Requests::ListCalendars — Add current-user-privilege-set to PROPERTIES so it is included in PROPFIND requests.
• Parsers::CalendarXML — Add privileges parser that extracts privilege names from the XML response.
• Calendar — Add :current_user_privilege_set to ATTRIBUTES, auto-generating the getter.
• Clients::CalendarsClient — Add :current_user_privilege_set to DEFAULT_ATTRIBUTES so it is fetched by default.
• Acceptance test — Add a test asserting that listed calendars include privilege information.

Usage

calendar = client.calendars.list.first
calendar.current_user_privilege_set
# => ["read", "write", "write-properties", ...]

[pat]

All looks good to me thus far - let me know when you feel it's ready to merge.

[AntoineGirard]

Hi @pat

Actually, I wrote spec only for radicale, but I didn’t try with Apple and Google provider.
Maybe we could add spec for these providers, but we need to regenerate cassettes.

[AntoineGirard]

I moved spec in shared spec and just added a cassette for Apple Calendar.

What do you think about it @pat ?

[AntoineGirard]

Hi @pat

Sorry for the reminder, I know that your time is precious. Have you got a bit of time to review this PR?
Otherwise, I could just use my fork while I wait.

Thanks a lot,

[pat]

Sorry it took me so long to get to this - just released in v0.6.0. Thanks for contributions!