Calendar for Roundcube

This is not my original plugin. It tracks Kolab's calendar plugin as they release it, and I mainly add and maintain the rounddav driver so it integrates cleanly with my RoundDAV Suite of plugins for Roundcube.

Overview

This plugin adds a full calendar interface to Roundcube, including:

• day, week, month, and agenda views
• multiple calendars with per-calendar colors
• recurring events
• reminders and alarms
• attendees, invitations, and RSVP handling
• attachments
• import/export support
• shared calendar support, depending on backend

This fork supports these backends:

• database for local SQL-backed calendars
• kolab for Kolab groupware storage
• caldav for generic CalDAV servers
• rounddav for RoundDAV integration

For calendar UI widgets, iTip handling, and iCal parsing/export, this plugin requires the libcalendaring and libkolab plugins.

Requirements

• Roundcube with plugin support enabled
• PHP 7.1 or newer
• The libcalendaring plugin
• The libkolab plugin
• A configured backend: database, kolab, caldav, or rounddav
• Database access for the plugin's local support tables

Admin Guide

1. Install the plugin

Copy this plugin into your Roundcube plugins/ directory as calendar.

If you are installing manually from Kolab sources, you also need these companion plugins:

• libcalendaring
• libkolab

Example layout:

roundcube/
  plugins/
    calendar/
    libcalendaring/
    libkolab/

2. Create the plugin config

Copy the distributed config and edit it for your environment:

cd plugins/calendar
cp config.inc.php.dist config.inc.php

The main setting is:

$config['calendar_driver'] = 'rounddav';

Valid values are:

• database
• kolab
• caldav
• rounddav

3. Initialize the SQL tables

Each backend ships with SQL initialization files under its own driver directory. Run Roundcube's database initialization script against the backend you plan to use.

Examples:

bin/initdb.sh --dir=plugins/calendar/drivers/database/SQL
bin/initdb.sh --dir=plugins/calendar/drivers/caldav/SQL
bin/initdb.sh --dir=plugins/calendar/drivers/kolab/SQL
bin/initdb.sh --dir=plugins/calendar/drivers/rounddav/SQL

Use the directory that matches your configured calendar_driver.

4. Enable the plugin in Roundcube

Add calendar to your active plugins list in config/config.inc.php:

$config['plugins'] = [
    // ...
    'calendar',
];

5. Configure the backend

RoundDAV backend

This fork is primarily intended for the rounddav backend.

Minimum working setup:

$config['calendar_driver'] = 'rounddav';
$config['calendar_caldav_server'] = 'https://www.domain.com/rounddav/public/';
$config['calendar_caldav_url'] = 'https://www.domain.com/rounddav/public/calendars/%u/%n/';

You can also use:

$config['rounddav_base_url'] = 'https://www.domain.com/rounddav/public';

If calendar_caldav_server is empty, the driver will fall back to rounddav_base_url.

Useful RoundDAV-specific options supported by this fork include:

• rounddav_calendar_slug_uri
• rounddav_calendar_autocolor
• rounddav_calendar_color_palette
• rounddav_calendar_favorites

Generic CalDAV backend

Use calendar_driver = 'caldav' and point the CalDAV settings to your server:

$config['calendar_driver'] = 'caldav';
$config['calendar_caldav_server'] = 'https://caldav.example.com/';
$config['calendar_caldav_url'] = 'https://caldav.example.com/calendars/%u/%n/';

Database backend

Use this when you want calendar storage fully inside Roundcube's database.

$config['calendar_driver'] = 'database';

Kolab backend

Use this when Roundcube is connected to a Kolab groupware environment.

$config['calendar_driver'] = 'kolab';

6. Review common calendar options

Some useful settings from config.inc.php.dist:

• calendar_default_view
• calendar_contact_birthdays
• calendar_timeslots
• calendar_agenda_range
• calendar_first_day
• calendar_first_hour
• calendar_work_start
• calendar_work_end
• calendar_default_alarm_type
• calendar_default_alarm_offset
• calendar_event_coloring
• calendar_allow_invite_shared
• calendar_itip_send_option

7. Optional: preinstall CalDAV sources

The sample config includes a commented example for calendar_caldav_preinstalled_sources. This is useful when you want every Roundcube user to automatically see one or more CalDAV or RoundDAV calendars.

Typical uses:

• a per-user RoundDAV calendar using %u and %p
• a shared or global calendar account with fixed credentials

Troubleshooting

• If the calendar page loads but no calendars appear, verify the selected calendar_driver and its URLs.
• If using rounddav, make sure either calendar_caldav_server or rounddav_base_url is set.
• If event dialogs or iCal handling fail, verify libcalendaring and libkolab are installed and enabled.
• If calendars exist but changes do not save, confirm the backend SQL tables were initialized for the selected driver.
• If free/busy is missing, review your kolab_freebusy_server and related scheduling configuration.

User Guide

Opening the calendar

Open the Calendar task in Roundcube. The interface provides:

• a main calendar view
• a mini calendar for quick navigation
• a calendar list on the left
• a toolbar for view changes, navigation, and new events

Changing views

Users can switch between:

• Day
• Week
• Month
• Agenda

Use the toolbar buttons to change views, and use the mini calendar or toolbar arrows to jump to another date.

Working with calendars

Users can:

• show or hide calendars with the checkbox list
• create a new calendar with the + button
• edit calendar name, color, and reminder behavior
• remove calendars they own

Depending on backend and permissions, users may also see:

• shared calendars
• read-only calendars
• birthdays calendars
• pending or declined invitation calendars

Creating events

Users can create events by:

• clicking New event in the toolbar
• dragging across a time range in day or week view
• double-clicking a day for an all-day event

Event fields include:

• title
• location
• description
• URL
• start and end
• all-day flag
• reminder
• calendar
• category
• free/busy status
• priority
• privacy

Editing and moving events

Users can:

• click an event to view details
• click Edit to change full event settings
• drag and drop events to move them
• resize events directly in the calendar view
• move an event between calendars from the edit form

Recurring events

The recurrence tab supports repeating events such as:

• daily
• weekly
• monthly
• yearly

Users can define how often the event repeats and when the series ends.

Reminders

Reminders can be configured per event and, depending on backend support, per calendar.

Users can:

• set a default reminder preference
• dismiss reminders
• snooze reminders for a later time

Invitations and scheduling

This plugin supports meeting workflows:

• adding participants
• sending invitations
• tracking RSVP responses
• checking availability
• booking resources when configured

When invitations are received by email, Roundcube can process them through the calendar integration.

Search, import, export, and printing

Users can also:

• search events by keyword
• import calendar data
• export events as iCal
• print calendar views

Notes

• This plugin is based on Kolab's calendar codebase.
• In this fork, the main project-specific work is keeping the rounddav backend integrated and compatible with the RoundDAV Suite for Roundcube.
• The bundled helpdocs/ directory contains additional upstream end-user documentation.

License

This project is distributed under the GPL-3.0 license. See LICENSE.