Network Working Group A. Melnikov
Internet-Draft Isode Limited
Intended status: Standards Track Q. Sun
Expires: December 26, 2010 Huawei Technologies
June 24, 2010
Sieve Extension for converting messages before delivery
draft-ietf-sieve-convert-00
Abstract
This document describes how Lemonade CONVERT can be used to transform
messages before final delivery.
Status of this Memo
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This Internet-Draft will expire on December 26, 2010.
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Table of Contents
1. Conventions Used in this Document . . . . . . . . . . . . . . . 3
2. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. :converted tagged argument to the 'fileinto' action . . . . . . 3
4. Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
5. Security Considerations . . . . . . . . . . . . . . . . . . . . 4
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 4
7. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 4
8. Normative References . . . . . . . . . . . . . . . . . . . . . 4
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . 5
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1. Conventions Used in this Document
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].
Conventions for notations are as in [SIEVE] section 1.1, including
the use of [ABNF].
2. Introduction
The [CONVERT] extension adds an IMAP command for performing client
controlled conversions on whole messages or their body parts. This
document defines a similar extension to the SIEVE [SIEVE] mail
filtering language, which reuses conversion parameters and framework
established by [CONVERT].
3. :converted tagged argument to the 'fileinto' action
Usage: :converted <quoted-from-mime-type: string>
<quoted-to-mime-type: string>
<transcoding-params: string-list>
The :converted tag specifies that all body parts with "quoted-from-
mime-type" MIME type should be converted to "quoted-to-mime-type"
MIME type using conversion parameters specified in "transcoding-
params". Each conversion parameter value has the following syntax:
"<transcoding-param>=<transcoding-param-value>", where <transcoding-
param> and <transcoding-param-value> are defined in [CONVERT].
Messages which don't have any body part with the "quoted-from-mime-
type" MIME type are not affected by the conversion.
[[anchor3: Should there be a way to specify/restrict which specific
body parts need to be converted (e.g. only the second body part)?
Should there be a way to specify multiple conversions (on different
body parts of the same message)?]]
[[anchor4: Interaction with MIME Loops (e.g. if :converted is
applicable to the replace action) should be specified.]]
4. Examples
In the following examples all "image/tiff" body parts of the message
are converted to "image/jpeg" with image resolution of 320x480
pixels.
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require ["fileinto", "convert"];
fileinto :converted "image/tiff" "image/jpeg" "pix-x" "320"
"pix-y" "480" "INBOX";
Messages which don't have image/tiff body parts are delivered to
INBOX as is.
5. Security Considerations
[[anchor6: TBD]]
6. IANA Considerations
IANA is requested to add the following registrations to the list of
Sieve extensions:
Capability name: convert
Description: adds a new tag to the fileinto action that enables
Sieve script to perform a conversion on the message being
delivered.
RFC number: this RFC
Contact address: The Sieve discussion list
<ietf-mta-filters@imc.org>
7. Acknowledgements
[[anchor9: TBD]].
8. Normative References
[ABNF] Crocker, D., Ed. and P. Overell, "Augmented BNF for Syntax
Specifications: ABNF", RFC 5234, January 2008.
[CONVERT] Melnikov, A., Ed. and P. Coates, Ed., "Internet Message
Access Protocol - CONVERT Extension", RFC 5259, July 2008.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", RFC 2119, BCP 14, March 1997.
[SIEVE] Guenther, P., Ed. and T. Showalter, Ed., "Sieve: An Email
Filtering Language", RFC 5228, January 2008.
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Authors' Addresses
Alexey Melnikov
Isode Limited
5 Castle Business Village
36 Station Road
Hampton, Middlesex TW12 2BX
UK
Email: Alexey.Melnikov@isode.com
URI: http://www.melnikov.ca/
Qian Sun
Huawei Technologies
Bantian Longgang
Shenzhen, Guandong 518129
P.R China
Phone: +86 755 28780808
Email: sunqian@huawei.com
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