Tech-invite3GPPspaceIETFspace
959493929190898887868584838281807978777675747372717069686766656463626160595857565554535251504948474645444342414039383736353433323130292827262524232221201918171615141312111009080706050403020100
in Index   Prev   Next

RFC 5032

WITHIN Search Extension to the IMAP Protocol

Pages: 5
Proposed Standard
Updates:  3501

ToP   noToC   RFC5032 - Page 1
Network Working Group                                     E. Burger, Ed.
Request for Comments: 5032                             BEA Systems, Inc.
Updates: 3501                                             September 2007
Category: Standards Track


              WITHIN Search Extension to the IMAP Protocol

Status of This Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Abstract

This document describes the WITHIN extension to IMAP SEARCH. IMAP SEARCH returns messages whose internal date is within or outside a specified interval. The mechanism described here, OLDER and YOUNGER, differs from BEFORE and SINCE in that the client specifies an interval, rather than a date. WITHIN is useful for persistent searches where either the device does not have the capacity to perform the search at regular intervals or the network is of limited bandwidth and thus there is a desire to reduce network traffic from sending repeated requests and redundant responses.

1. Introduction

This extension exposes two new search keys, OLDER and YOUNGER, each of which takes a non-zero integer argument corresponding to a time interval in seconds. The server calculates the time of interest by subtracting the time interval the client presents from the current date and time of the server. The server then either returns messages older or younger than the resultant time and date, depending on the search key used.

1.1. Conventions Used in This Document

In examples, "C:" and "S:" indicate lines sent by the client and server, respectively. 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 RFC 2119 [RFC2119].
ToP   noToC   RFC5032 - Page 2
   When describing the general syntax, we omit some definitions, as RFC
   3501 [RFC3501] defines them.

2. Protocol Operation

An IMAP4 server that supports the capability described here MUST return "WITHIN" as one of the server supported capabilities in the CAPABILITY command. For both the OLDER and YOUNGER search keys, the server calculates a target date and time by subtracting the interval, specified in seconds, from the current date and time of the server. The server then compares the target time with the INTERNALDATE of the message, as specified in IMAP [RFC3501]. For OLDER, messages match if the INTERNALDATE is less recent than or equal to the target time. For YOUNGER, messages match if the INTERNALDATE is more recent than or equal to the target time. Both OLDER and YOUNGER searches always result in exact matching, to the resolution of a second. However, if one is doing a dynamic evaluation, for example, in a context [CONTEXT], one needs to be aware that the server might perform the evaluation periodically. Thus, the server may delay the updates. Clients MUST be aware that dynamic search results may not reflect the current state of the mailbox. If the client needs a search result that reflects the current state of the mailbox, we RECOMMEND that the client issue a new search.

3. Formal Syntax

The following syntax specification uses the Augmented Backus-Naur Form (ABNF) notation. Elements not defined here can be found in the formal syntax of ABNF [RFC4234] and IMAP [RFC3501]. This document extends RFC 3501 [RFC3501] with two new search keys: OLDER <interval> and YOUNGER <interval>. search-key =/ ( "OLDER" / "YOUNGER" ) SP nz-number ; search-key defined in RFC 3501

4. Example

C: a1 SEARCH UNSEEN YOUNGER 259200 S: a1 * SEARCH 4 8 15 16 23 42 Search for all unseen messages within the past 3 days, or 259200 seconds, according to the server's current time.
ToP   noToC   RFC5032 - Page 3

5. Security Considerations

The WITHIN extension does not raise any security considerations that are not present in the base protocol. Considerations are the same as for IMAP [RFC3501].

6. IANA Considerations

Per the IMAP RFC [RFC3501], registration of a new IMAP capability in the IMAP Capability registry requires the publication of a standards- track RFC or an IESG approved experimental RFC. The registry is currently located at <http://www.iana.org/assignments/imap4-capabilities>. This standards-track document defines the WITHIN IMAP capability. IANA has added this extension to the IANA IMAP Capability registry.

7. References

7.1. Normative References

[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", RFC 2119, BCP 14, March 1997. [RFC3501] Crispin, M., "Internet Message Access Protocol - Version 4rev1", RFC 3501, March 2003. [RFC4234] Crocker, D., Ed. and P. Overell, "Augmented BNF for Syntax Specifications: ABNF", RFC 4234, October 2005.

7.2. Informative References

[CONTEXT] Melnikov, D. and C. King, "Contexts for IMAP4", Work in Progress, May 2006.
ToP   noToC   RFC5032 - Page 4

Appendix A. Contributors

Stephane Maes and Ray Cromwell wrote the original version of this document as part of P-IMAP, as well as the first versions for the IETF. From an attribution perspective, they are clearly authors.

Appendix B. Acknowledgements

The authors want to thank all who have contributed key insight and who have extensively reviewed and discussed the concepts of LPSEARCH. They also thank the authors of its early introduction in P-IMAP. We also want to give a special thanks to Arnt Gilbrandsen, Ken Murchison, Zoltan Ordogh, and most especially Dave Cridland for their review and suggestions. A special thank you goes to Alexey Melnikov for his choice submission of text.

Author's Address

Eric W. Burger (editor) BEA Systems, Inc. USA EMail: eric.burger@bea.com URI: http://www.standardstrack.com
ToP   noToC   RFC5032 - Page 5
Full Copyright Statement

   Copyright (C) The IETF Trust (2007).

   This document is subject to the rights, licenses and restrictions
   contained in BCP 78, and except as set forth therein, the authors
   retain all their rights.

   This document and the information contained herein are provided on an
   "AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS
   OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY, THE IETF TRUST AND
   THE INTERNET ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS
   OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF
   THE INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED
   WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

Intellectual Property

   The IETF takes no position regarding the validity or scope of any
   Intellectual Property Rights or other rights that might be claimed to
   pertain to the implementation or use of the technology described in
   this document or the extent to which any license under such rights
   might or might not be available; nor does it represent that it has
   made any independent effort to identify any such rights.  Information
   on the procedures with respect to rights in RFC documents can be
   found in BCP 78 and BCP 79.

   Copies of IPR disclosures made to the IETF Secretariat and any
   assurances of licenses to be made available, or the result of an
   attempt made to obtain a general license or permission for the use of
   such proprietary rights by implementers or users of this
   specification can be obtained from the IETF on-line IPR repository at
   http://www.ietf.org/ipr.

   The IETF invites any interested party to bring to its attention any
   copyrights, patents or patent applications, or other proprietary
   rights that may cover technology that may be required to implement
   this standard.  Please address the information to the IETF at
   ietf-ipr@ietf.org.