free-busy-request not working

[wlamers]

I have placed this on the Baikal github as well, but I am now not so sure anymore if it is Baikal related. Hope someone can shed some light on this?

It might be related to #1185
That's a very old thread, so not so likely that nobody else bumped into this in the mean time.

Really hope someone has a clue!

Baikal version
0.10.1

PHP version
8.1.33

Steps to reproduce
Requesting free-busy report from other users on the server, using several CalDAV clients like Thunderbird and Evolution.

Expected behaviour
Free-busy information being reported.

Current behaviour
There is no result shown (empty).

I have done many hours of debugging with Wireshark. Also changed from Sqlite to Mysql and from digest to basic auth.

It seems that Thunderbird is sending these request to url: '/dav.php/calendars/test/outbox/'
I then also have imitated the request using Python scripts and might have found a clue (No calendar-home-set property found). See the logs. I have tried to add "calendar-home-set" to the mysql database, but to no avail.

Logs

Response body: <?xml version="1.0" encoding="utf-8"?>
<cal:schedule-response xmlns:d="DAV:" xmlns:s="http://sabredav.org/ns" xmlns:cal="urn:ietf:params:xml:ns:caldav" xmlns:cs="http://calendarserver.org/ns/" xmlns:card="urn:ietf:params:xml:ns:carddav">
  <cal:response>
    <cal:recipient>
      <d:href>mailto:redact@redact.com</d:href>
    </cal:recipient>
    <cal:request-status>3.7;No calendar-home-set property found</cal:request-status>
  </cal:response>
</cal:schedule-response>

What seems to work: I can retrieve the free-busy info if I send a request (using the below Python script) to the user calendar path directly. E.g. to /dav.php/calendars/test/thecalendarname/

import requests
from requests.auth import HTTPDigestAuth
import xml.etree.ElementTree as ET
from datetime import datetime, timedelta

USERNAME = "user@redacted.com"
PASSWORD = "pwd"
CALDAV_URL = "http://server/dav.php/calendars/test/thecalendarname/"

START = "20251023T000000Z"
END = "20251024T000000Z"

# CalDAV free-busy REPORT XML body
FREE_BUSY_REPORT = f"""<?xml version="1.0" encoding="UTF-8"?>
<c:free-busy-query xmlns:c="urn:ietf:params:xml:ns:caldav">
  <c:time-range start="{START}" end="{END}"/>
</c:free-busy-query>


# HTTP headers
HEADERS = {
    "Content-Type": "application/xml; charset=utf-8",
    "Depth": "1"
}

# Make the REPORT request
response = requests.request(
    method="REPORT",
    url=CALDAV_URL,
    headers=HEADERS,
    data=FREE_BUSY_REPORT,
    auth=HTTPDigestAuth(USERNAME, PASSWORD)
)

# Check the response
if response.status_code == 200:
    print("Free-busy data retrieved successfully!")
    print(response.text)
else:
    print(f"Failed to fetch free-busy data: {response.status_code}")
    print(response.text)

The sample output:

Free-busy data retrieved successfully!
BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Sabre//Sabre VObject 4.5.6//EN
CALSCALE:GREGORIAN
BEGIN:VFREEBUSY
DTSTART:20251023T000000Z
DTEND:20251024T000000Z
DTSTAMP:20251026T141808Z
FREEBUSY:20251023T083000Z/20251023T093000Z
END:VFREEBUSY
END:VCALENDAR

That seems to work. But I cannot get any information from any of the email/CalDAV clients... If I use Nextcloud as a back-end it does work by the way.

I am out of options and really need to get this to work (many people on our server relying on it).

Could you please help me out? I can imagine others have the same issue.