Calendar subscription upgrades
draft-ietf-calext-subscription-upgrade-02

Document Type Active Internet-Draft (calext WG)
Last updated 2020-07-29
Replaces draft-douglass-subscription-upgrade
Stream IETF
Intended RFC status Proposed Standard
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Stream WG state WG Document (wg milestones: Apr 2019 - Adopt a document for..., Dec 2020 - Submit Subscription ... )
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Network Working Group                                        M. Douglass
Internet-Draft                                              29 July 2020
Updates: 5988 (if approved)                                             
Intended status: Standards Track                                        
Expires: 30 January 2021

                     Calendar subscription upgrades
               draft-ietf-calext-subscription-upgrade-02

Abstract

   This specification updates [RFC5545] to add the value DELETED to the
   STATUS property.

   This specification also updates [RFC7240] to add the subscribe-
   enhanced-get and limit preferences.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on 30 January 2021.

Copyright Notice

   Copyright (c) 2020 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents (https://trustee.ietf.org/
   license-info) in effect on the date of publication of this document.
   Please review these documents carefully, as they describe your rights
   and restrictions with respect to this document.  Code Components
   extracted from this document must include Simplified BSD License text
   as described in Section 4.e of the Trust Legal Provisions and are
   provided without warranty as described in the Simplified BSD License.

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Internet-Draft       Calendar subscription upgrades            July 2020

Table of Contents

   1.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     2.1.  Terms and Definitions . . . . . . . . . . . . . . . . . .   3
   3.  Discovering alternative access methods  . . . . . . . . . . .   3
   4.  Enhanced GET  . . . . . . . . . . . . . . . . . . . . . . . .   4
     4.1.  General . . . . . . . . . . . . . . . . . . . . . . . . .   4
     4.2.  Deletions . . . . . . . . . . . . . . . . . . . . . . . .   5
     4.3.  Handling of invalid sync tokens . . . . . . . . . . . . .   5
     4.4.  Paging the response . . . . . . . . . . . . . . . . . . .   5
     4.5.  Caching of responses  . . . . . . . . . . . . . . . . . .   6
     4.6.  Examples  . . . . . . . . . . . . . . . . . . . . . . . .   6
   5.  Changes to the iCalendar specifications . . . . . . . . . . .   8
     5.1.  Redefined Status property . . . . . . . . . . . . . . . .   8
   6.  Header Field: Sync-Token  . . . . . . . . . . . . . . . . . .  10
   7.  New Prefer header field preferences . . . . . . . . . . . . .  10
     7.1.  Preference subscribe-enhanced-get . . . . . . . . . . . .  10
     7.2.  Preference limit  . . . . . . . . . . . . . . . . . . . .  11
   8.  Link relations  . . . . . . . . . . . . . . . . . . . . . . .  11
     8.1.  General . . . . . . . . . . . . . . . . . . . . . . . . .  11
     8.2.  subscribe-caldav  . . . . . . . . . . . . . . . . . . . .  11
     8.3.  subscribe-caldav-auth . . . . . . . . . . . . . . . . . .  11
     8.4.  subscribe-webdav-sync . . . . . . . . . . . . . . . . . .  11
     8.5.  subscribe-enhanced-get  . . . . . . . . . . . . . . . . .  12
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .  12
   10. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  12
     10.1.  Sync-Token HTTP Header Field Registration  . . . . . . .  12
     10.2.  Preference Registrations . . . . . . . . . . . . . . . .  12
     10.3.  Link Relation Registrations  . . . . . . . . . . . . . .  13
   11. Normative References  . . . . . . . . . . . . . . . . . . . .  13
   Appendix A.  Open issues  . . . . . . . . . . . . . . . . . . . .  14
   Appendix B.  Change log . . . . . . . . . . . . . . . . . . . . .  14
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  15

1.  Acknowledgements

   The author would also like to thank the members of the CalConnect
   Calendar Sharing technical committee and the following individuals
   for contributing their ideas and support:

   Marten Gajda, Ken Murchison, Garry Shutler

   The authors would also like to thank CalConnect, the Calendaring and
   Scheduling Consortium, for advice with this specification.

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