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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                                                       XSF
Expires: August 5, 2007                                      A. Melnikov
                                                           Isode Limited
                                                        February 1, 2007


                   Sieve Notification Mechanism: xmpp
                    draft-ietf-sieve-notify-xmpp-03

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Copyright Notice

   Copyright (C) The IETF Trust (2007).

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 parameter ":method"  . . . . . . . . . . . . . . . . 3
     2.2.  Notify tag ":from"  . . . . . . . . . . . . . . . . . . . . 4
     2.3.  Notify tag ":options" . . . . . . . . . . . . . . . . . . . 4
     2.4.  Notify tag ":importance"  . . . . . . . . . . . . . . . . . 4
     2.5.  Notify tag ":message" . . . . . . . . . . . . . . . . . . . 4
   3.  Examples  . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
   4.  Internationalization Considerations . . . . . . . . . . . . . . 5
   5.  Security Considerations . . . . . . . . . . . . . . . . . . . . 6
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . . . 6
     6.1.  Normative References  . . . . . . . . . . . . . . . . . . . 6
     6.2.  Informative References  . . . . . . . . . . . . . . . . . . 7
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . . . 7
   Intellectual Property and Copyright Statements  . . . . . . . . . . 8
































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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]), which is widely
   implemented in Jabber instant messaging technologies.

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 general XMPP syntax
   is as follows:

   o  The notification MUST be an XMPP <message/> stanza.
   o  The value of the XMPP 'type' attribute MUST be 'headline' or
      'normal'.
   o  The value of the XMPP 'from' attribute MUST be the XMPP address of
      the notification service.
   o  The XMPP <message/> stanza MAY include a <subject/> child element
      whose value is some configurable text indicating that the message
      is a Sieve notification.
   o  The notification SHOULD include a URL for the recipient to use as
      a hint in locating the message, encapsulated as the XML character
      data of a <url/> child element of an <x/> element qualified by the
      'jabber:x:oob' namespace as specified in [XEP-0066].

   The recommended mapping of the Sieve notify action into XMPP syntax
   is described in the following sections.

2.1.  Notify parameter ":method"

   The ":method" parameter MUST be a URI that conforms to the xmpp URI
   scheme (as specified in [XMPP-URI]) and that identifies an XMPP



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   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.

2.2.  Notify tag ":from"

   The ":from" tag has no special meaning for this notification
   mechanism, and this specification puts no restriction on its use.  As
   noted, the value of the XMPP 'from' attribute specified in the XMPP
   notification message MUST be the XMPP address of the notification
   service itself.  The value of the ":from" tag MAY be transformed into
   XMPP syntax; if so, it SHOULD be encapsulated as the value of an
   [XEP-0131] header named "Reply-To".

2.3.  Notify tag ":options"

   The ":options" tag has no special meaning for this notification
   mechanism.  Any handling of this tag is the responsibility of an
   implementation.

2.4.  Notify tag ":importance"

   The ":importance" tag has no special meaning for this notification
   mechanism, and this specification puts no restriction on its use.
   The value of the ":importance" tag MAY be transformed into XMPP
   syntax (in addition to or instead of including it in the default
   message); if so, it MUST be encapsulated as the value of an
   [XEP-0131] header named "Urgency", and the XML character of that
   header MUST be "high" if the value of the ":importance" tag is "1",
   "medium" if the value of the ":importance" tag is "2", or "low" if
   the value of the ":importance" tag is "3".

2.5.  Notify tag ":message"

   If included, the ":message" tag SHOULD be transformed into the XML
   character data of an XMPP <body/> element.  If not included, the rule
   specified in [NOTIFY] SHOULD be followed, as shown in the examples
   below.


3.  Examples

   In the following examples, the sender of the email has an address of
   <mailto:juliet@example.org>, the entity to be notified has an XMPP



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   address of <xmpp:romeo@example.com>, and the notification service has
   an XMPP address <xmpp:notify.example.com>.

   The following is a basic Sieve notify action with only a method:

   notify :method "xmpp:romeo@example.com"

   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>
   </message>

   The following is a more advanced Sieve notify action with a method,
   importance, subject, and message, as well as a URL pointing to the
   message:

   notify :method "xmpp:romeo@example.com?message;subject=SIEVE"
          :importance "1"
          :message "Contact Juliet immediately!"

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

   <message from='notify.example.com'
            to='romeo@example.com'
            xml:lang='en'>
     <subject>SIEVE</subject>
     <body>Contact Juliet immediately!</body>
     <headers xmlns='http://jabber.org/protocol/shim'>
       <header name='Urgency'>high</header>
     </headers>
     <x xmlns='jabber:x:oob'>
       <url>
         imap://romeo@example.com/INBOX;UIDVALIDITY=385759045/;UID=20
       </url>
     </x>
   </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



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   generating XMPP URIs.

   In accordance with Section 13 of RFC 3920, all data sent over XMPP
   MUST be encoded in [UTF-8].


5.  Security Considerations

   Depending on the information included, sending a notification can be
   comparable to forwarding mail to the notification recipient.  Care
   must be taken when forwarding mail automatically, to ensure that
   confidential information is not sent into an insecure environment.
   In particular, implementations MUST conform to the security
   considerations given in [NOTIFY], [SIEVE], and [XMPP].


6.  References

6.1.  Normative References

   [XEP-0066]
              Saint-Andre, P., "Out of Band Data", XSF XEP 0066,
              January 2006.

   [XEP-0131]
              Saint-Andre, P. and J. Hildebrand, "Stanza Headers and
              Internet Metadata", XSF XEP 0131, August 2005.

   [NOTIFY]   Melnikov, A., Leiba, B., Segmuller, W., and T. Martin,
              "Sieve Extension: Notifications",
              draft-ietf-sieve-notify-06 (work in progress),
              January 2007.

   [SIEVE]    Showalter, T. and P. Guenther, "Sieve: An Email Filtering
              Language", draft-ietf-sieve-3028bis-09 (work in progress),
              August 2006.

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

   [XMPP-URI]
              Saint-Andre, P., "Internationalized Resource Identifiers
              (IRIs) and Uniform Resource Identifiers (URIs) for the
              Extensible Messaging and Presence Protocol (XMPP)",
              RFC 4622, August 2006.






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6.2.  Informative References

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

   [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.

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


Authors' Addresses

   Peter Saint-Andre
   XMPP Standards Foundation

   Email: stpeter@jabber.org


   Alexey Melnikov
   Isode Limited

   Email: Alexey.Melnikov@isode.com












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