One document matched: draft-ietf-sieve-notify-xmpp-01.txt
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Sieve Working Group P. Saint-Andre
Internet-Draft Jabber Software Foundation
Expires: December 25, 2006 A. Melnikov
Isode Limited
June 23, 2006
Sieve Notification Mechanism: xmpp
draft-ietf-sieve-notify-xmpp-01
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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 tag ":method" . . . . . . . . . . . . . . . . . . . 3
2.2 Notify tag ":from" . . . . . . . . . . . . . . . . . . . . 4
2.3 Notify tag ":options" . . . . . . . . . . . . . . . . . . 4
2.4 Notify tag ":priority" . . . . . . . . . . . . . . . . . . 4
2.5 Notify tag ":message" . . . . . . . . . . . . . . . . . . 4
3. Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
4. Internationalization Considerations . . . . . . . . . . . . . 5
5. Security Considerations . . . . . . . . . . . . . . . . . . . 5
6. References . . . . . . . . . . . . . . . . . . . . . . . . . . 6
6.1 Normative References . . . . . . . . . . . . . . . . . . . 6
6.2 Informative References . . . . . . . . . . . . . . . . . . 6
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]), 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 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 tag ":method"
The ":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 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
[XMPP-SHIM] 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 ":priority"
The ":priority" tag has no special meaning for this notification
mechanism, and this specification puts no restriction on its use.
The value of the ":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" if the value of the ":priority" tag is "1", "medium" if the
value of the ":priority" tag is "2", or "low" if the value of the
":priority" 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
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:
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<message from='notify.example.com'
to='romeo@example.com'
xml:lang='en'>
<subject>A Sieve instant notification!</subject>
<body><juliet@example.org> Wherefore art thou?</body>
</message>
The following is a more advanced Sieve notify action with a method,
priority, and message:
notify :method "xmpp:romeo@example.com"
:priority "high"
: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>A Sieve instant notification!</subject>
<body>Contact Juliet immediately!</body>
<headers xmlns='http://jabber.org/protocol/shim'>
<header name='Urgency'>high</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.
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
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6.1 Normative References
[NOTIFY] Melnikov, A., "Sieve Extension: Notifications",
draft-ietf-sieve-notify-03 (work in progress), June 2006.
[SIEVE] Showalter, T. and P. Guenther, "Sieve: An Email Filtering
Language", draft-ietf-sieve-3028bis-06 (work in progress),
March 2006.
[TERMS] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[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.
[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-04 (work in progress),
March 2006.
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.
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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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