Description
-----------

This program implements a HTTP proxy meant to be used with Communigate Pro's
WebCal server and Mozilla Sunbird/Calendar setup to post a shared calendar.
Normally calendar entries deleted in Mozilla do not get deleted from
Communigate. This is due to Communigate assuming a HTTP PUT means to append
calendar entries, while Mozilla assumes it to replace the whole calendar.

What needs to be done is a HTTP DELETE before the HTTP PUT. This proxy
implements such a method. Mozilla should be pointed to post calendars to
this proxy instead of Communigate.

Supposedly this will not be needed when Communigate supports WebDav.

Caveats
-------

Mozilla's shared calendaring is not scalable. It's a hack, and so is this
script. See this bug:

https://bugzilla.mozilla.org/show_bug.cgi?id=217550

For each change on a 'remote' calendar, Mozilla will retrieve
the whole calendar from the server, make its change, then post the whole
calendar back to the server. Think about if you have a large calendar.
It will get very slow. Mozilla's shared calendaring needs to be totally
revamped.

Requirements
------------

I have only tested this with Python 2.3.4 on Linux. Your mileage may vary.

Setup
-----

- Edit delete_put_httpd.py and change the variables at top of script. 
You will need to set the Communigate server address/port as well as the
listen address/port.

- Start the filter as a normal user:

./delete_put_httpd.py &

The script should not be run as root. Logs are sent to standard output. You
can redirect this to a file if you wish.

- Configure Mozilla to point to the server and port this script is running on
when publishing or retrieving Communigate calendars.

Bugs and Suggestions
--------------------

If you find any problems or have suggestions, please let me know at
valankar@gmail.com.