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;;;; GNU Mailutils -- a suite of utilities for electronic mail
;;;; Copyright (C) 1999-2001, 2006-2007, 2010-2012 Free Software
;;;; Foundation, Inc.
;;;;
;;;; GNU Mailutils is free software; you can redistribute it and/or modify
;;;; it under the terms of the GNU General Public License as published by
;;;; the Free Software Foundation; either version 3, or (at your option)
;;;; any later version.
;;;;
;;;; GNU Mailutils is distributed in the hope that it will be useful,
;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;;;; GNU General Public License for more details.
;;;;
;;;; You should have received a copy of the GNU General Public License along
;;;; with GNU Mailutils. If not, see <http://www.gnu.org/licenses/>.
;;;; This module provides sieve's "redirect" action.
;;; rfc3028 says:
;;; "Implementations SHOULD take measures to implement loop control,"
;;; We do this by appending an "X-Sender" header to each message
;;; being redirected. If one of the "X-Sender" headers of the message
;;; contains our email address, we assume it is a loop and bail out.
(define (sent-from-me? msg)
(call-with-current-continuation
(lambda (exit)
(for-each
(lambda (hdr)
(if (and (string-ci=? (car hdr) "X-Sender")
(string-ci=? (mu-address-get-email (cdr hdr))
sieve-my-email))
(exit #t)))
(mu-message-get-header-fields sieve-current-message))
#f)))
;;; redirect action
(define (action-redirect address)
(sieve-verbose-print "REDIRECT" "to address " address)
(handle-exception
(if sieve-my-email
(cond
((sent-from-me? sieve-current-message)
(runtime-message SIEVE-WARNING "Redirection loop detected"))
(else
(let ((out-msg (mu-message-copy sieve-current-message))
(sender (mu-message-get-sender sieve-current-message)))
(mu-message-set-header out-msg "X-Sender" sieve-my-email)
(mu-message-send out-msg #f sender address)
(mu-message-destroy out-msg))
(mu-message-delete sieve-current-message))))))
;;; Register action
(if sieve-parser
(sieve-register-action "redirect" action-redirect (list 'string) '()))
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