mod_caldav

mod_caldav is an Apache module that implements RFC 4791 (CalDAV), which expands on the WebDAV protocol to establish a uniform approach to accessing, organizing, and collaborating on calendaring and scheduling information using the iCalendar format. This module leverages libical for iCalendar manipulation, specifically the library of Evolution Data Server (EDS) - without other EDS components. Some patches were incorporated into EDS, e.g. heap bug fixes in libical and client-side fixes for using Evolution as a calendar client such as caching timezone information for scheduled events and enabling forward proxy, among others.

Configuration requires specific directives from mod_dav_acl: DAVETagResponse on to enable strong ETag responses, DAVACL on for ACL handling, and optional setting of MaxAttendeesPerInstance to 10000, although not required by the current implementation. To install, run ./configure && make && make install, with autoreconf -i as a possible prerequisite for autogenerating proper configuration files.

To run tests, the module must successfully compile and load, with the ./caldav_tests command or make check for test execution. An admin (digest) account is required, with the /xxx/caldav directory accessible and available to Apache. Overall, mod_caldav offers a reliable and efficient approach to incorporating CalDAV functionalities within the Apache server, particularly for collaborative calendaring and scheduling.