CLI tools to import Calendar and AddressBook entries into multiple users?

Question

We've exported data from an older 3rd-party messaging system being replaced with OCUCS 7u2, with calendar and task data as ICS files (one file with dozens of entries), and address-book data in a similar format (carddav?), one file of each type per user (who had non-empty calendars or address-books).
Now the quest is to get this data into OCUCS :)
Unfortunately, davadmin did not work for us (see post davadmin does not work with a GF instance without admin server for more details), and there seems to be no similar tool for PAB to import/export entries.
We expected to find or write some scripts that would either add data into OCUCS backends (PAB LDAP, davadmin or even direct mysql for calendar+tasks), but it seems more proper to use standard tools (if available) instead of inventing our own wheels - that is, caldav/carddav or WCAP/WABP HTTP clients, or other protocol tools that can do import/export like GUI clients but invoked from command line and with proxy-auth capability.
To review, we need to be able to import some file-based representation of calendar and addressbook data into OCUCS users' accounts from Unix command-line/script. If using protocol tools, this should work using only one admin account with the known password (and proxy-authenticating into other users' addressbooks and calendars for import tasks). For additional imports (i.e. synchronization while the old system is primary) no duplicate entries should appear, at least as long as they are identical; preferably UID and timestamp (if available) should be used to update older entries.
Surprisingly, there are tons of GUI and mobile clients and plugins, but we found nearly no command-line ones. Seemingly, our best automation option might be to impose scripting onto clients like Thunderbird/Lightning or Convergence to do the jobs, or possibly fool an OutLook with the Connector into doing the job. Automation like CURL proxy-logins into Convergence and calling import/export URLs from there are being explored now...
What do other people use for such quests? What can you suggest? What do you know we should look out for? ;)
Thanks!

Answer 1

Thanks a lot for the hint, it does seem the way to go, except that I can't get it working so far :(
One thing to look out for is the line-ending character (should be DOS-style CRLF), so I have to "dos2unix" and "unix2dos" my prepared POST data to get it cleaned up properly (comes from various sources, so both endings are present in original blob of text).
However, now that I got the appserver to accept the post data, calendar says "missing file param", or in more detail:
BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Oracle Corporation/CS 7u2-4.19//EN
X-NSCP-WCAP-ERRNO:60
X-NSCP-WCAP-ERRNO-MESSAGE:Invalid arguments such as invalid email address
, invalid date.
X-NSCP-WCAP-ERRNO-DETAILED-MESSAGE:missing file param
END:VCALENDARI've tried with "id" and proper login session (via login.wcap) instead of simple http auth, with the same result.
Am I hitting something stupid simple? ;)
Next I'd have to try it with a real web-browser...
Edited by: JimKlimov on Apr 24, 2013 3:22 AM
UPDATE: Tried with a browser, same result when I login with either a proxy-user and its pass, or the end-user and his pass. Logins with bad credentials do fail.
Maybe the ICS data format is unexpected by Calendar Server (too many fields, some Microsoft-centric), or there are problems with UTF-8 text pieces in the entries? (Produced with DavMail, an open-source tool recommended by an Oracle engineer)
Alas, same result for the sample ICS markup in that Wiki post...
Thanks in advance for any more ideas :)