enough_icalendar

iCalendar library in pure Dart to parse, generate and respond to iCal / ics invites. Fully compliant with the iCalendar standard RFC 5545 and compliant to all VEvent functions of iTIP / RFC 5546.

Installation

Add this dependency your pubspec.yaml file:

dependencies:
  enough_icalendar: ^0.10.0

The latest version or enough_icalendar is .

API Documentation

Check out the full API documentation at https://pub.dev/documentation/enough_icalendar/latest/

Usage

Use enough_icalendar to parse, generate and respond to iCalendar requests.

Import

import 'package:enough_icalendar/enough_icalendar.dart';

Parse iCalendar Requests

Use VComponent.parse(String) to parse the specified text.

  final text = '''BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//hacksw/handcal//NONSGML v1.0//EN
BEGIN:VEVENT
UID:uid1@example.com
DTSTAMP:19970714T170000Z
ORGANIZER;CN=John Doe:MAILTO:john.doe@example.com
DTSTART:19970714T170000Z
DTEND:19970715T035959Z
RRULE:FREQ=YEARLY
SUMMARY:Bastille Day Party
GEO:48.85299;2.36885
END:VEVENT
END:VCALENDAR''';
  final icalendar = VComponent.parse(text) as VCalendar;
  print(icalendar.productId); // -//hacksw/handcal//NONSGML v1.0//EN
  final event = icalendar.event!;
  print(event.summary); // Bastille Day Party
  print(event.start); // 1997-06-14 at 17:00
  print(event.end); // 1997-07-15 at 03:59:59
  print(event.recurrenceRule?.toHumanReadableText()); // Annually
  print(event.recurrenceRule
      ?.toHumanReadableText(languageCode: 'de')); // Jährlich
  print(event.organizer?.commonName); // John Doe
  print(event.organizer?.email); // john.doe@example.com
  print(event.geoLocation?.latitude); // 48.85299
  print(event.geoLocation?.longitude); // 2.36885
}

Generate an invite

Use VCalendar.createEvent(...) to create a new invite easily.

Alternatively, for full low-lewel control instantiate VCalendar yourself and add VComponent children as you need. Add any properties to the components to fill it with live.

Call the toString() method to render your invite.

  final invite = VCalendar.createEvent(
    organizerEmail: 'a@example.com',
    attendeeEmails: ['a@example.com', 'b@example.com', 'c@example.com'],
    rsvp: true,
    start: DateTime(2021, 07, 21, 10, 00),
    end: DateTime(2021, 07, 21, 11, 00),
    location: 'Big meeting room',
    url: Uri.parse('https://enough.de'),
    summary: 'Discussion',
    description:
        'Let us discuss how to proceed with the enough_icalendar development. It seems that basic functionality is now covered. What\'s next?',
    productId: 'enough_icalendar/v1',
  );
  print(invite);
  return invite;
  // prints this:
  //
  // BEGIN:VCALENDAR
  // PRODID:enough_icalendar/v1
  // VERSION:2.0
  // METHOD:REQUEST
  // BEGIN:VEVENT
  // DTSTAMP:20210719T090527
  // UID:RQPhszGcPqYFR4fRUT@example.com
  // DTSTART:20210721T100000
  // DTEND:20210721T110000
  // ORGANIZER:mailto:a@example.com
  // SUMMARY:Discussion
  // DESCRIPTION:Let us discuss how to proceed with the enough_icalendar deve
  //  lopment. It seems that basic functionality is now covered. What's next?
  // LOCATION:Big meeting room
  // URL:https://enough.de
  // ATTENDEE;RSVP=TRUE:mailto:a@example.com
  // ATTENDEE;RSVP=TRUE:mailto:b@example.com
  // ATTENDEE;RSVP=TRUE:mailto:c@example.com
  // END:VEVENT
  // END:VCALENDAR

Accept or Decline an Invite

Attendees can change their participant status with VCalendar.replyWithParticipantStatus(...). You either need to specify the attendeeEmail or the attendee parameter. This reply will need to be sent to the organizer.

  final reply = invite.replyWithParticipantStatus(ParticipantStatus.accepted,
      attendeeEmail: 'b@example.com');
  print(reply);
  // prints this:
  //
  // BEGIN:VCALENDAR
  // PRODID:enough_icalendar
  // VERSION:2.0
  // METHOD:REPLY
  // BEGIN:VEVENT
  // ORGANIZER:mailto:a@example.com
  // UID:jovSCDXQ3sI5mBuu32@example.com
  // ATTENDEE;PARTSTAT=ACCEPTED:mailto:b@example.com
  // DTSTAMP:20210719T093653
  // REQUEST-STATUS:2.0;Success
  // END:VEVENT

Delegate Event Participation

Attendees can delegate their event particpation to others by calling VCalendar.delegate(...). Two results are generated, one iCalendar for the delegatee and another one for the organizer.

  final delegationResult = original.delegate(
    fromEmail: 'c@example.com',
    toEmail: 'e@example.com',
  );
  print(delegationResult.requestForDelegatee);
  // prints this:
  //
  // BEGIN:VCALENDAR
  // PRODID:enough_icalendar/v1
  // VERSION:2.0
  // METHOD:REQUEST
  // BEGIN:VEVENT
  // DTSTAMP:20210719T173821
  // UID:RQPhszGcPqYFR4fRUT@example.com
  // DTSTART:20210721T100000
  // DTEND:20210721T110000
  // ORGANIZER:mailto:a@example.com
  // SUMMARY:Discussion
  // DESCRIPTION:Let us discuss how to proceed with the enough_icalendar deve
  //  lopment. It seems that basic functionality is now covered. What's next?
  // LOCATION:Big meeting room
  // URL:https://enough.de
  // ATTENDEE;RSVP=TRUE:mailto:a@example.com
  // ATTENDEE;RSVP=TRUE:mailto:b@example.com
  // ATTENDEE;PARTSTAT=DELEGATED;DELEGATED-TO="mailto:e@example.com":mailto:c
  //  @example.com
  // ATTENDEE;DELEGATED-FROM="mailto:c@example.com";RSVP=TRUE:mailto:e@exampl
  //  e.com
  // END:VEVENT
  // END:VCALENDAR

  print(delegationResult.replyForOrganizer);
  // prints this:
  //
  // BEGIN:VCALENDAR
  // PRODID:enough_icalendar
  // VERSION:2.0
  // METHOD:REPLY
  // BEGIN:VEVENT
  // ORGANIZER:mailto:a@example.com
  // UID:RQPhszGcPqYFR4fRUT@example.com
  // ATTENDEE;PARTSTAT=DELEGATED;DELEGATED-TO="mailto:e@example.com":mailto:c
  //  @example.com
  // DTSTAMP:20210719T173821
  // REQUEST-STATUS:2.0;Success
  // END:VEVENT
  // END:VCALENDAR

Creating and Reponding to Counter Proposals

Attendees can create counter proposals and organizers can accept or decline such proposals.

Create a Counter Proposals

Attendees can create counter proposals with VCalendar.counter(...):

  final counterProposal = invite.counter(
    comment: 'This time fits better, also we need some more time.',
    start: DateTime(2021, 07, 23, 10, 00),
    end: DateTime(2021, 07, 23, 12, 00),
    location: 'Carnegie Hall',
  );
  print(counterProposal);
  // prints this:
  //
  // BEGIN:VCALENDAR
  // PRODID:enough_icalendar/v1
  // VERSION:2.0
  // METHOD:COUNTER
  // BEGIN:VEVENT
  // UID:RQPhszGcPqYFR4fRUT@example.com
  // ORGANIZER:mailto:a@example.com
  // SUMMARY:Discussion
  // DESCRIPTION:Let us discuss how to proceed with the enough_icalendar deve
  //  lopment. It seems that basic functionality is now covered. What's next?
  // URL:https://enough.de
  // ATTENDEE;RSVP=TRUE:mailto:a@example.com
  // ATTENDEE;RSVP=TRUE:mailto:b@example.com
  // ATTENDEE;RSVP=TRUE:mailto:c@example.com
  // DTSTAMP:20210719T142550
  // COMMENT:This time fits better, also we need some more time.
  // LOCATION:Carnegie Hall
  // DTSTART:20210723T100000
  // DTEND:20210723T120000
  // END:VEVENT
  // END:VCALENDAR

Accept a Counter Proposal

Organizers can accept a counter proposal with VCalendar.acceptCounter(...). The accepted proposal will have a higher sequence and the status automatically be set to EventStatus.confirmed. The accepted and update invite is to be sent to all attendees by the organizer.

  final accepted = counterProposal.acceptCounter(
      comment: 'Accepted this proposed change of date and time');
  print(accepted);
  // prints this:
  //
  // BEGIN:VCALENDAR
  // PRODID:enough_icalendar/v1
  // VERSION:2.0
  // METHOD:REQUEST
  // BEGIN:VEVENT
  // UID:RQPhszGcPqYFR4fRUT@example.com
  // ORGANIZER:mailto:a@example.com
  // SUMMARY:Discussion
  // DESCRIPTION:Let us discuss how to proceed with the enough_icalendar deve
  //  lopment. It seems that basic functionality is now covered. What's next?
  // URL:https://enough.de
  // ATTENDEE;RSVP=TRUE:mailto:a@example.com
  // ATTENDEE;RSVP=TRUE:mailto:b@example.com
  // ATTENDEE;RSVP=TRUE:mailto:c@example.com
  // LOCATION:Carnegie Hall
  // DTSTART:20210723T100000
  // DTEND:20210723T120000
  // SEQUENCE:1
  // DTSTAMP:20210719T143344
  // STATUS:CONFIRMED
  // COMMENT:Accepted this proposed change of date and time
  // END:VEVENT
  // END:VCALENDAR 

Decline a Counter Proposal

Organizers can decline a counter proposal with VCalendar.declineCounter(...). The declined reply is to be sent to the proposing attendee.

  final declined = counterProposal.declineCounter(
      attendeeEmail: 'b@example.com',
      comment: 'Sorry, but we have to stick to the original schedule');
  print(declined);
  // prints this:
  //
  // BEGIN:VCALENDAR
  // PRODID:enough_icalendar/v1
  // VERSION:2.0
  // METHOD:DECLINECOUNTER
  // BEGIN:VEVENT
  // UID:vmScK-AyJr0NX2nCsW@example.com
  // ORGANIZER:mailto:a@example.com
  // SUMMARY:Discussion
  // DESCRIPTION:Let us discuss how to proceed with the enough_icalendar deve
  //  lopment. It seems that basic functionality is now covered. What's next?
  // URL:https://enough.de
  // ATTENDEE;RSVP=TRUE:mailto:b@example.com
  // DTSTAMP:20210719T143715
  // LOCATION:Carnegie Hall
  // DTSTART:20210723T100000
  // DTEND:20210723T120000
  // COMMENT:Sorry, but we have to stick to the original schedule
  // END:VEVENT
  // END:VCALENDAR

Features and bugs

enough_icalendar supports all icalendar components and provides easy to access models:

• VCALENDAR
• VEVENT
• VTIMEZONE with the STANDARD and DAYLIGHT subcomponents
• VALARM
• VFREEBUSY
• VTODO
• VJOURNAL
• Fully compliant with the iCalendar standard RFC 5545
• Compliant to all VEvent functions of iTIP / RFC 5546.

Please file feature requests and bugs at the issue tracker.

Related Projects

• Use enough_icalendar_export to export calendar invites to the native calendar
• Check out enough_mail_icalendar for handling calendar invites in emails

Null-Safety

enough_icalendar is null-safe.

License

enough_icalendar is licensed under the commercial friendly Mozilla Public License 2.0