CalDAV Extension for scheduling controls
draft-gondwana-caldav-scheduling-controls-00

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calext                                                  B. Gondwana, Ed.
Internet-Draft                                                  FastMail
Updates: 6638 (if approved)                             February 8, 2019
Intended status: Standards Track
Expires: August 12, 2019

                CalDAV Extension for scheduling controls
              draft-gondwana-caldav-scheduling-controls-00

Abstract

   This document adds headers to control and restrict the scheduling
   behaviour of CalDAV servers when updating calendaring resources.

Status of This Memo

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

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   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on August 12, 2019.

Copyright Notice

   Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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   described in the Simplified BSD License.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions Used In This Document . . . . . . . . . . . . . .   3
   3.  Extending the CalDAV OPTIONS response . . . . . . . . . . . .   3
     3.1.  Example: Using OPTIONS for the Discovery of Scheduling
           Controls Support  . . . . . . . . . . . . . . . . . . . .   3
   4.  New headers . . . . . . . . . . . . . . . . . . . . . . . . .   3
     4.1.  Scheduling header . . . . . . . . . . . . . . . . . . . .   3
     4.2.  Schedule-User-Address header  . . . . . . . . . . . . . .   4
   5.  Implementation considerations . . . . . . . . . . . . . . . .   5
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   8.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   5
   9.  Normative References  . . . . . . . . . . . . . . . . . . . .   5
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   5

1.  Introduction

   [RFC6638] defines automatic scheduling operations for resources
   stored on [!@RFC4791] CalDAV servers.

   [RFC6638] defines the "Schedule-Reply" header in Section 8.1, however
   this header is not sufficient for controlling scheduling in all
   cases.

   Cases where it might be necessary to update the data store on a
   server without causing scheduling messages to be sent include backup
   after a data loss event on the server, or importing calendar events
   from another system.

   Calendar server operators deal with these other needs by either using
   a different method than CalDAV to update their server, or by adding a
   custom method to suppress scheduling.  This document defines a
   standard method to suppress scheduling, allowing CalDAV to be
   directly used for restores and imports.

   Complex sites can have users who have multiple aliases, and in the
   most complex cases, a user may have multiple identities who are
   present on a scheduling event as organizer and/or attendee.  When an
   event is updated over CalDAV, the server must calculate or guess
   which of those addresses the current user is acting as.  This
   document defines a header which allows the client to inform the
   server precisely which address they are acting as when adding,
   modifying or removing a resource.

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2.  Conventions Used In This Document

   In examples, "C:" indicates data sent by a client that is connected
   to a server.  "S:" indicates data sent by the server to the client.

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119] when they