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Versions: (draft-saintandre-sieve-notify-xmpp) 00 01 02 03 04 05 06 07 08 09 RFC 5437

Sieve Working Group                                       P. Saint-Andre
Internet-Draft                                Jabber Software Foundation
Expires: July 21, 2006                                       A. Melnikov
                                                           Isode Limited
                                                        January 17, 2006


                   Sieve Notification Mechanism: xmpp
                    draft-ietf-sieve-notify-xmpp-00

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Copyright Notice

   Copyright (C) The Internet Society (2006).

Abstract

   This document describes a profile of the Sieve extension for
   notifications, to allow notifications to be sent over the Extensible
   Messaging and Presence Protocol (XMPP), also known as Jabber.







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Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.1   Overview . . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.2   Terminology  . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Definition . . . . . . . . . . . . . . . . . . . . . . . . . .  3
     2.1   Notify ":method" tag . . . . . . . . . . . . . . . . . . .  3
     2.2   Notify ":priority" tag . . . . . . . . . . . . . . . . . .  4
   3.  Example  . . . . . . . . . . . . . . . . . . . . . . . . . . .  4
   4.  Internationalization Considerations  . . . . . . . . . . . . .  4
   5.  Security Considerations  . . . . . . . . . . . . . . . . . . .  4
   6.  References . . . . . . . . . . . . . . . . . . . . . . . . . .  5
     6.1   Normative References . . . . . . . . . . . . . . . . . . .  5
     6.2   Informative References . . . . . . . . . . . . . . . . . .  5
       Authors' Addresses . . . . . . . . . . . . . . . . . . . . . .  6
       Intellectual Property and Copyright Statements . . . . . . . .  7



































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1.  Introduction

1.1  Overview

   The [NOTIFY] extension to the [SIEVE] mail filtering language is a
   framework for providing notifications by employing URIs to specify
   the notification mechanism.  This document defines how xmpp URIs (see
   [XMPP-URI]) are used to generate notifications via the Extensible
   Messaging and Presence Protocol (see [XMPP]), also known as Jabber.

1.2  Terminology

   This document inherits terminology from [NOTIFY], [SIEVE], and
   [XMPP].

   The capitalized key words "MUST", "MUST NOT", "REQUIRED", "SHALL",
   "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED",  "NOT
   RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be
   interpreted as described in RFC 2119 [TERMS].

2.  Definition

   The xmpp mechanism results in the sending of an XMPP message to
   notify a recipient about an email message.  The notification MUST be
   an XMPP <message/> stanza.  The value of the XMPP 'type' attribute
   MUST be 'headline' or 'normal'.  The value of the XMPP 'from'
   attribute MUST be the XMPP address of the notification service.  The
   XMPP <message/> stanza MAY include a <subject/> child element whose
   value is either the ":subject" tag or, absent that, some configurable
   text indicating that the message is a Sieve notification.

   The format of the notify action is described in the following
   sections.

2.1  Notify ":method" tag

   The notify ":method" tag MUST be a URI that conforms to the xmpp URI
   scheme (as specified in [XMPP-URI]) and that identifies an XMPP
   account associated with the email inbox.  The URI MAY include the
   resource identifier portion of an XMPP address but SHOULD NOT include
   an authority component, query component, or fragment identifier
   component.  The processing application MUST extract an XMPP address
   from the URI in accordance with the processing rules specified in
   [XMPP-URI].  The resulting XMPP address MUST be encapsulated in XMPP
   syntax as the value of the XMPP 'to' attribute.






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2.2  Notify ":priority" tag

   The notify ":priority" tag has no special meaning for this
   notification mechanism, and this specification puts no restriction on
   its use.  The value of the notify ":priority" tag MAY be transformed
   into XMPP syntax; if so, it SHOULD be encapsulated as the value of an
   [XMPP-SHIM] header named "Urgency", and the XML character of that
   header SHOULD be "high", "medium", or "low".

3.  Example

   Consider the following Sieve notify action:

   notify :method "xmpp:romeo@example.com"
          :id "some-id"
          :priority "high"
          :message "<juliet@example.org> Wherefore art thou?";

   The resulting XMPP <message/> stanza might be as follows:

   <message from='notify.example.com'
            to='romeo@example.com'
            xml:lang='en'>
     <subject>A Sieve instant notification!</subject>
     <body>&lt;juliet@example.org&gt; Wherefore art thou?</body>
     <headers xmlns='http://jabber.org/protocol/shim'>
       <header name='Priority'>urgent</header>
     </headers>
   </message>


4.  Internationalization Considerations

   Although an XMPP address may contain nearly any [UNICODE] character,
   the value of the ":method" tag MUST be a Uniform Resource Identifier
   (see [URI]) rather than an Internationalized Resource Identifier (see
   [IRI]).  The rules specified in [XMPP-URI] MUST be followed when
   generating XMPP URIs.

5.  Security Considerations

   Detailed security considerations for the relevant protocols profiled
   in this document are given in [NOTIFY], [SIEVE], and [XMPP]; this
   document introduces no new security concerns above and beyond those
   described in the foregoing specifications.

6.  References




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6.1  Normative References

   [NOTIFY]   Melnikov, A., "Sieve -- An extension for providing instant
              notifications", draft-ietf-sieve-notify-01 (work in
              progress), October 2005.

   [SIEVE]    Showalter, T. and P. Guenther, "Sieve: An Email Filtering
              Language", draft-ietf-sieve-3028bis-05 (work in progress),
              November 2005.

   [TERMS]    Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.

   [XMPP]     Saint-Andre, P., "Extensible Messaging and Presence
              Protocol (XMPP): Core", RFC 3920, October 2004.

   [XMPP-URI]
              Saint-Andre, P., "Internationalized Resource Identifiers
              (IRIs) and Uniform Resource  Identifiers (URIs) for the
              Extensible Messaging and Presence Protocol (XMPP)",
              draft-saintandre-xmpp-iri-03 (work in progress),
              December 2005.

6.2  Informative References

   [IRI]      Duerst, M. and M. Suignard, "Internationalized Resource
              Identifiers (IRIs)", RFC 3987, January 2005.

   [RFC1327]  Hardcastle-Kille, S., "Mapping between X.400(1988) / ISO
              10021 and RFC 822", RFC 1327, May 1992.

   [UNICODE]  The Unicode Consortium, "The Unicode Standard, Version
              3.2.0", 2000.

              The Unicode Standard, Version 3.2.0 is defined by The
              Unicode Standard, Version 3.0 (Reading, MA, Addison-
              Wesley, 2000.  ISBN 0-201-61633-5), as amended by the
              Unicode Standard Annex #27: Unicode 3.1
              (http://www.unicode.org/reports/tr27/) and by the Unicode
              Standard Annex #28: Unicode 3.2
              (http://www.unicode.org/reports/tr28/).

   [URI]      Berners-Lee, T., Fielding, R., and L. Masinter, "Uniform
              Resource Identifier (URI): Generic Syntax", STD 66,
              RFC 3986, January 2005.

   [UTF-8]    Yergeau, F., "UTF-8, a transformation format of ISO
              10646", STD 63, RFC 3629, November 2003.



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   [XMPP-SHIM]
              Saint-Andre, P. and J. Hildebrand, "Stanza Headers and
              Internet Metadata (SHIM)", JSF JEP 0131, August 2005.


Authors' Addresses

   Peter Saint-Andre
   Jabber Software Foundation

   Email: stpeter@jabber.org


   Alexey Melnikov
   Isode Limited

   Email: Alexey.Melnikov@isode.com


































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