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guimb/scm/redirect.scm 2.14 KB
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;;;; GNU Mailutils -- a suite of utilities for electronic mail
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;;;; Copyright (C) 1999, 2000, 2001, 2006, 2007, 2010 Free Software
;;;; Foundation, Inc.
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;;;;
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;;;; GNU Mailutils is free software; you can redistribute it and/or modify
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;;;; it under the terms of the GNU General Public License as published by
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;;;; the Free Software Foundation; either version 3, or (at your option)
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;;;; any later version.
;;;; 
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;;;; GNU Mailutils is distributed in the hope that it will be useful,
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;;;; 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.
;;;; 
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;;;; You should have received a copy of the GNU General Public License along
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;;;; with GNU Mailutils.  If not, see <http://www.gnu.org/licenses/>.
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;;;; 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
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   (lambda (exit)
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     (for-each
      (lambda (hdr)
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	(if (and (string-ci=? (car hdr) "X-Sender")
		 (string-ci=? (mu-address-get-email (cdr hdr))
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			   sieve-my-email))
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	    (exit #t))) 
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      (mu-message-get-header-fields sieve-current-message))
     #f)))

;;; redirect action
(define (action-redirect address)
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  (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))))))
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;;; Register action
(if sieve-parser
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    (sieve-register-action "redirect" action-redirect (list 'string) '()))
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