Serverside Subscriptions
draft-ietf-calext-serverside-subscriptions-00

Document Type Active Internet-Draft (calext WG)
Author Michael Douglass 
Last updated 2020-07-28
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Network Working Group                                        M. Douglass
Internet-Draft                                                  Bedework
Updates: 2518 (if approved)                                July 28, 2020
Intended status: Standards Track
Expires: January 29, 2021

                        Serverside Subscriptions
             draft-ietf-calext-serverside-subscriptions-00

Abstract

   This specification provides a mechanism whereby subscriptions to
   external resources can be handled by the server.

   This specification updates [RFC4791] to add new properties for the
   MKCOL request.

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 January 29, 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

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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Conventions Used in This Document . . . . . . . . . . . .   3
   2.  CalDAV Subscriptions  . . . . . . . . . . . . . . . . . . . .   3
     2.1.  Request . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  New DAV and CALDAV properties . . . . . . . . . . . . . . . .   4
     3.1.  DAV:subscription  . . . . . . . . . . . . . . . . . . . .   4
     3.2.  DAV:subscription-href . . . . . . . . . . . . . . . . . .   4
     3.3.  DAV:subscription-deletions-suppressed . . . . . . . . . .   5
     3.4.  DAV:subscription-disabled . . . . . . . . . . . . . . . .   5
     3.5.  DAV:subscription-next-refresh-interval  . . . . . . . . .   6
   4.  DAV:subscription-suggested-refresh-interval . . . . . . . . .   6
   5.  Refreshing and Reenabling the subscription  . . . . . . . . .   7
   6.  Response Delays . . . . . . . . . . . . . . . . . . . . . . .   7
   7.  CalDAV service Considerations . . . . . . . . . . . . . . . .   8
     7.1.  Deleted events  . . . . . . . . . . . . . . . . . . . . .   8
     7.2.  CalDAV restrictions . . . . . . . . . . . . . . . . . . .   8
     7.3.  Invitations in Subscriptions  . . . . . . . . . . . . . .   8
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   9.  Privacy Considerations  . . . . . . . . . . . . . . . . . . .   8
   10. IANA Considerations . . . . . . . . . . . . . . . . . . . . .   9
   11. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   9
   12. Normative References  . . . . . . . . . . . . . . . . . . . .   9
   Appendix A.  Open issues  . . . . . . . . . . . . . . . . . . . .  10
   Appendix B.  Change log . . . . . . . . . . . . . . . . . . . . .  10
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  11

1.  Introduction

   The motivation for this specification was initially to handle
   external subscriptions to calendar data.  However, any resource which
   allows subscriptions might make use of this specification.

   Currently subscriptions to calendar feeds are handled by calendar
   clients.  There are a number of disadvantages to this approach: users
   have to subscribe from multiple devices and the subscription cannot
   affect scheduling handled by the server.

   This specification defines a mechanism whereby the server will
   subscribe to the feed and make it visible in the user's home.

   The advantages are popular feeds can be cached by the server and the
   user only has to make a single subscription.

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1.1.  Conventions Used in This Document

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
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