shared xDAV resources

Anatoli me at anatoli.ws
Sat Apr 7 17:30:06 EDT 2018


Hi All,

I'm trying to understand the code responsible for enumerating user 
calendars (and xDAV resources in general) to try to make the discovery 
work for shared resources too (currently there's no way to access shared 
resources with Apple xDAV client implementation, yes with Thunderbird as 
it doesn't use the discovery mechanism, but instead should be pointed to 
the exact URL for each calendar). If I understand it correctly, the 
functionality is in imap/http_caldav.c.

Could you please point me to the place where the enumeration occurs and 
briefly mention how the general workflow looks like?

The client asks for:

PROPFIND /dav/calendars/user/<user at domain>/

<A:propfind xmlns:A="DAV:">
...

The server responds with:

HTTP/1.1 207 Multi-Status

<A:multistatus xmlns:A="DAV:" ...>
   <A:response>
<A:href>/dav/calendars/user/<user at domain>/</A:href>
     <A:propstat>
...
   </A:response>
   <A:response>
<A:href>/dav/calendars/user/<user at domain>/Default/</A:href>
     <A:propstat>
       <A:prop>
...

The idea is to include in the returned lists the shared calendars too 
with the discovery logic based on the IMAP shared folders.

Below goes the initial exchange between the calendar app on iOS 10.2.6 
and Cyrus 3.0.5 when the exact URL (/dav/calendars/shared/) for the 
shared calendar is provided in the advanced settings of the app (the URL 
finally resets to the user principals folder 
(/dav/principals/user/t3 at domain.com/) as iOS is pointed to it by Cyrus). 
In the attached file goes the telemetry for the rest of the communication.

Thanks,
Anatoli

---------- t3 at domain.com Sun Mar 25 06:05:36 2018

<1521968736<*PROPFIND* */dav/calendars/shared/* HTTP/1.1
Accept: */*
Content-type: text/xml
Connection: keep-alive
Content-length: 181
Host: mail.domain.com
User-agent: iOS/11.2.6 (15D100) accountsd/1.0
Prefer: return=minimal
Depth: 0
Brief: t
Accept-language: en-us
Authorization: Basic ...
Accept-encoding: br, gzip, deflate

<1521968736<<?xml version="1.0" encoding="UTF-8"?>
<A:propfind xmlns:A="DAV:">
   <A:prop>
     <A:current-user-principal/>
     <A:principal-URL/>
     <A:resourcetype/>
   </A:prop>
</A:propfind>


 >1521968736>HTTP/1.1 207 Multi-Status
Date: Sun, 25 Mar 2018 09:05:36 GMT
Strict-Transport-Security: max-age=600
Vary: Accept-Encoding, Brief, Prefer
Preference-Applied: return=minimal
Content-Type: application/xml; charset=utf-8
Content-Length: 546

<?xml version="1.0" encoding="utf-8"?>
<A:multistatus xmlns:A="DAV:" xmlns:C="urn:ietf:params:xml:ns:caldav">
   <A:response>
     <A:href>*/dav/calendars/shared/*</A:href>
     <A:propstat>
       <A:prop>
         <A:current-user-principal>
           <A:href>*/dav/principals/user/t3 at domain.com/*</A:href>
         </A:current-user-principal>
         <A:resourcetype>
           <A:collection/>
           <C:calendar/>
         </A:resourcetype>
       </A:prop>
       <A:status>HTTP/1.1 200 OK</A:status>
     </A:propstat>
   </A:response>
</A:multistatus>

<1521968736<OPTIONS /dav/principals/user/t3%40domain.com/ HTTP/1.1
Host: mail.domain.com
Connection: keep-alive
Accept: */*
User-Agent: iOS/11.2.6 (15D100) accountsd/1.0
Accept-Language: en-us
Content-Length: 0
Accept-Encoding: br, gzip, deflate

 >1521968736>HTTP/1.1 200 OK
Date: Sun, 25 Mar 2018 09:05:36 GMT
Strict-Transport-Security: max-age=600
Cache-Control: no-cache
Link: </dav/principals/.server-info>; rel="server-info"; 
token="80769c2c66d340ecd178710db26d56b9c4699e3e"
DAV: 1, 2, 3, access-control, extended-mkcol, resource-sharing
DAV: calendar-access, calendar-auto-schedule
DAV: calendar-query-extended, calendar-availability, 
calendar-managed-attachments
DAV: calendarserver-sharing, inbox-availability
DAV: addressbook
Allow: OPTIONS, GET, HEAD
Allow: PROPFIND, REPORT, COPY
Content-Length: 0
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