How to Enable a Calendar for Roundcube Mail

Roundcube is awesome webmail. The most complete I have ever seen so far. It's fancy, look and feel combined with its IMAP access makes it not only very intuitive but to be synchronized with other clients. Well, if you are familiar with IMAP protocol you will understand why. Anyway, you can go to the Roundcube official website to read about the multiple capabilities this software has.

One thing that Roundcube lacks is a Calendar, similar to the Google Calendar. Lucky us, Kolab the open source project, has published a calendar plugin for Roundcube. I will talk here how I manage to install it under my ISPConfig3 web hosting server.

Installation of the Calendar Plugin for Roundcube

Follow these commands. You can change them to fit the specific paths of your deployments.

yum install git php-sabre-*
cd /tmp
git clone https://git.kolab.org/diffusion/RPK/roundcubemail-plugins-kolab.git
cd /usr/share/roundcube/plugins
cp -r /tmp/roundcubemail-plugins-kolab/plugins/calendar .
cp -r /tmp/roundcubemail-plugins-kolab/plugins/libcalendaring .
cd calendar
cp config.inc.php.dist config.inc.php

Edit config.inc.php to fit your needs. Then follow:

mysql -u root -pYOURPASSWORD roundcubedb < drivers/database/SQL/mysq.initial.sql

Patch the Calendar Plugin

CentOS 7 (and probably other distributions) does not have the composer and it does not load automatically the classes. You need to patch it. Do the following:

cd ../libcalendaring
nano libvcalendar.php

Add the following code:

spl_autoload_register(function ($class) {
    if (strpos($class, 'Sabre\\')===0) {
        $file = '/usr/share/php/'.str_replace('\\', '/', $class).'.php';
        @include $file;
    }
});

Disclaimer

I have not tested this plugin too much. I just created an event and verified for errors in the system.

Enjoy!