IMAP Extension for object identifiers
draft-ietf-extra-imap-objectid-01

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Document Type Active Internet-Draft (extra WG)
Last updated 2018-04-23 (latest revision 2018-04-20)
Replaces draft-ietf-extra-imap-uniqueid
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EXTRA                                                        B. Gondwana
Internet-Draft                                                  FastMail
Intended status: Standards Track                          April 24, 2018
Expires: October 26, 2018

                 IMAP Extension for object identifiers
                   draft-ietf-extra-imap-objectid-01

Abstract

   This document adds new properties to IMAP mailboxes and messages to
   allow clients to more efficiently re-use cached data for resources
   which have changed location on the server.

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
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   This Internet-Draft will expire on October 26, 2018.

Copyright Notice

   Copyright (c) 2018 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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Gondwana                Expires October 26, 2018                [Page 1]
Internet-Draft                IMAP ObjectID                   April 2018

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions Used In This Document . . . . . . . . . . . . . .   3
   3.  CAPABILITY Identification . . . . . . . . . . . . . . . . . .   3
   4.  MAILBOXID object identifier . . . . . . . . . . . . . . . . .   3
     4.1.  New response code for CREATE  . . . . . . . . . . . . . .   4
     4.2.  New OK Untagged Response for SELECT and EXAMINE . . . . .   4
     4.3.  New attribute for STATUS  . . . . . . . . . . . . . . . .   5
   5.  EMAILID object identifier and THREADID correlator . . . . . .   6
     5.1.  EMAILID identifier for identical messages . . . . . . . .   6
     5.2.  THREADID identifer for related messages . . . . . . . . .   6
     5.3.  New Message Data Items in FETCH and UID FETCH Commands  .   7
   6.  New Filters on SEARCH command . . . . . . . . . . . . . . . .   9
   7.  Formal syntax . . . . . . . . . . . . . . . . . . . . . . . .   9
   8.  Implementation considerations . . . . . . . . . . . . . . . .  10
     8.1.  Assigning object identifiers  . . . . . . . . . . . . . .  10
     8.2.  Interaction with special cases  . . . . . . . . . . . . .  11
   9.  Future considerations . . . . . . . . . . . . . . . . . . . .  11
   10. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  11
   11. Security Considerations . . . . . . . . . . . . . . . . . . .  11
   12. Changes . . . . . . . . . . . . . . . . . . . . . . . . . . .  12
     12.1.  draft-ietf-extra-imap-objectid-01  . . . . . . . . . . .  12
     12.2.  draft-ietf-extra-imap-objectid-00  . . . . . . . . . . .  12
     12.3.  draft-ietf-extra-imap-uniqueid-00  . . . . . . . . . . .  13
     12.4.  draft-gondwana-imap-uniqueid-01  . . . . . . . . . . . .  13
     12.5.  draft-gondwana-imap-uniqueid-00  . . . . . . . . . . . .  13
   13. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  13
     13.1.  Appendix 1: ideas for implementing object identifiers  .  13
   14. References  . . . . . . . . . . . . . . . . . . . . . . . . .  14
     14.1.  Normative References . . . . . . . . . . . . . . . . . .  14
     14.2.  Informative References . . . . . . . . . . . . . . . . .  15
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  15

1.  Introduction

   IMAP stores are often used by many clients.  Each client may cache
   data from the server so that they don't need to re-download
   information.  [RFC3501] defines that a mailbox can be uniquely
   referenced by its name and UIDVALIDITY, and a message within that
   mailbox can be uniquely referenced by its mailbox (name +
   UIDVALIDITY) and UID.  The triple of mailbox name, UIDVALIDITY and
   UID is guaranteed to be immutable.

   [RFC4315] defines a COPYUID response which allows a client which
   copies messages to know the mapping between the UIDs in the source
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