[asterisk-bugs] [JIRA] (ASTERISK-30106) res_calendar_icalendar: Microsoft online ICS calendars no longer work

[N A (JIRA)]

N A created ASTERISK-30106:
------------------------------

             Summary: res_calendar_icalendar: Microsoft online ICS calendars no longer work
                 Key: ASTERISK-30106
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-30106
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: Resources/res_calendar_icalendar
    Affects Versions: 18.12.0
            Reporter: N A


A few days ago, outlook.com shared ICS calendars seemed to stop working, for no apparent reason.

Every 10 minutes, I get these warnings in the CLI:

{noformat}
[Jun 12 08:54:39] WARNING[564844]: res_calendar_icalendar.c:151 fetch_icalendar: Unable to retrieve iCalendar 'REDACTED' from 'https://REDACTED/calendar.ics': 400
[Jun 12 08:54:39] WARNING[564844]: res_calendar_icalendar.c:478 ical_load_calendar: Unable to parse iCalendar 'REDACTED'
[Jun 12 08:54:39] ERROR[564844]: res_calendar_icalendar.c:366 icalendar_update_events: The iCalendar has not been parsed!
[Jun 12 08:54:39] WARNING[564842]: res_calendar_icalendar.c:151 fetch_icalendar: Unable to retrieve iCalendar 'REDACTED' from 'https://REDACTED/calendar.ics': 400
[Jun 12 08:54:39] WARNING[564842]: res_calendar_icalendar.c:478 ical_load_calendar: Unable to parse iCalendar 'REDACTED'
[Jun 12 08:54:39] ERROR[564842]: res_calendar_icalendar.c:366 icalendar_update_events: The iCalendar has not been parsed!
[Jun 12 08:54:39] WARNING[564843]: res_calendar_icalendar.c:151 fetch_icalendar: Unable to retrieve iCalendar 'REDACTED' from 'https://REDACTED/calendar.ics': 400
[Jun 12 08:54:39] WARNING[564843]: res_calendar_icalendar.c:478 ical_load_calendar: Unable to parse iCalendar 'REDACTED'
[Jun 12 08:54:39] ERROR[564843]: res_calendar_icalendar.c:366 icalendar_update_events: The iCalendar has not been parsed!
{noformat}

As a result, calendaring has completely broken in Asterisk for me.

Importantly:

- This happens with all calendars for Outlook.com, and in multiple Microsoft accounts, so it's not an account issue.
- Other ICS links work fine without triggering these warnings
- Outlook.com shared ICS calendars work fine in other calendaring programs, e.g. mail clients

So the problem is both specific to the Office 365 ICS format as well as Asterisk since both are required to trigger the problem. Even if Microsoft changed something, it seems to work fine in other applications so there seems to be some lack of support given the 400 Bad Request errors.

Tested with both Debian 10 and Debian 11, and Asterisk 18.9 and Asterisk 18.12.



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