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 This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at http://datatracker.ietf.org/drafts/current/. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." This Internet-Draft will expire on December 26, 2010. Copyright Notice Copyright (c) 2010 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. Melnikov & Sun Expires December 26, 2010 [Page 1] Internet-Draft Sieve CONVERT June 2010 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 Melnikov & Sun Expires December 26, 2010 [Page 2] Internet-Draft Sieve CONVERT June 2010 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 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: "=", where and 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. Melnikov & Sun Expires December 26, 2010 [Page 3] Internet-Draft Sieve CONVERT June 2010 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 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. Melnikov & Sun Expires December 26, 2010 [Page 4] Internet-Draft Sieve CONVERT June 2010 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 Melnikov & Sun Expires December 26, 2010 [Page 5]