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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 "vacation" extension
;;; vacation example:
;;; vacation :days 18
;;; :aliases ["gray@gnu.org", "gray@mirddin.farlep.net"]
;;; :addresses ["bug-mailutils@gnu.org","bug-inetutils@gnu.org"]
;;; :subject "I'm on vacation"
;;; :mime
;;; text:
;;; I am on vacation until July 22. I'll attend your message as soon
;;; as I'm back.
;;; .
;;;
;;; Additionally, the :sender flag may be used to debug the script.
;; Debugging flag
(define vacation-debug #f)
;; Each entry is (cons SENDER DATE), where SENDER is the sender email
;; address (lowercase) and DATE is the date where the first message
;; from this sender was received.
(define vacation-db '())
(define (vacation-downcase name)
(let ((len (string-length name)))
(do ((i 0 (1+ i)))
((= i len) name)
(string-set! name i (char-downcase (string-ref name i))))))
(define (vacation-db-name)
(let ((pwd (mu-getpwuid (getuid))))
(string-append (vector-ref pwd 5) "/.vacation.db")))
(define (vacation-db-load)
(catch #t
(lambda ()
(call-with-input-file (vacation-db-name)
(lambda (port)
(set! vacation-db (read port)))))
(lambda args args)))
(define (vacation-db-save)
(catch #t
(lambda ()
(let ((mask (umask #o077)))
(call-with-output-file (vacation-db-name)
(lambda (port)
(display ";; Vacation database file\n" port)
(display ";; Generated automatically. Please do not edit\n"
port)
(write vacation-db port)))
(umask mask)))
(lambda args args)))
(define (vacation-db-lookup sender days)
(vacation-db-load)
(let ((val (assoc (vacation-downcase sender) vacation-db)))
(cond
(val
(cond
((and days (> days 0))
(<= (- (car (gettimeofday)) (cdr val)) (* days 86400)))
(else
#t)))
(else
#f))))
(define (vacation-db-update msg)
(let* ((sender (vacation-downcase (mu-message-get-sender msg)))
(date (car (gettimeofday)))
(val (assoc sender vacation-db)))
(cond
(val
(set-cdr! val date))
(else
(set! vacation-db (append vacation-db (list
(cons sender date)))))))
(vacation-db-save))
(define vacation-noreply-senders
(list
".*-REQUEST@.*"
".*-RELAY@.*"
".*-OWNER@.*"
"OWNER-.*"
"postmaster@.*"
"UUCP@.*"
"MAILER@.*"
"MAILER-DAEMON@.*"))
(define (vacation-reply? msg aliases addresses days)
(let ((sender (mu-message-get-sender msg)))
(and
;; No message will be sent unless an alias is part of either
;; the "To:" or "Cc:" headers of the mail.
(call-with-current-continuation
(lambda (exit)
(for-each
(lambda (hdr)
(cond
(hdr
(let ((count (mu-address-get-count hdr)))
(do ((i 1 (1+ i)))
((> i count) #f)
(let ((email (mu-address-get-email hdr i)))
(for-each
(lambda (alias)
(if (string-ci=? alias email)
(exit #t)))
aliases)))))))
(list (mu-message-get-header msg "To")
(mu-message-get-header msg "Cc")))
#f))
;; Messages sent from one of the vacation-noreply-senders are not
;; responded to
(call-with-current-continuation
(lambda (exit)
(do ((explist (append vacation-noreply-senders addresses)
(cdr explist)))
((null? explist) #t)
(let ((rx (make-regexp (car explist) regexp/icase)))
(if (regexp-exec rx sender)
(exit #f))))))
;; Messages with Precedence: bulk or junk are not responded to
(let ((prec (mu-message-get-header msg "Precedence")))
(not (and prec (or (string-ci=? prec "bulk")
(string-ci=? prec "junk")))))
;; Senders already in the database get no response
(not (vacation-db-lookup sender days)))))
(define (vacation-send-reply subject text sender)
(let ((sender "root@localhost")
(mesg (mu-message-create)))
(let ((port (mu-message-get-port mesg "w")))
(display text port)
(close-output-port port))
(mu-message-set-header mesg "X-Sender"
(string-append "vacation.scm, " mu-package-string)
#t)
(mu-message-send mesg #f #f sender)))
(define (action-vacation text . opt)
(sieve-verbose-print "VACATION")
(set! vacation-debug (member #:debug opt))
(if vacation-debug
(begin
(display sieve-current-message)(display ": ")))
(cond
((vacation-reply? sieve-current-message
(append (list sieve-my-email)
(sieve-get-opt-arg opt #:aliases '()))
(sieve-get-opt-arg opt #:addresses '())
(sieve-get-opt-arg opt #:days #f))
(vacation-send-reply (sieve-get-opt-arg
opt #:subject
(string-append "Re: "
(mu-message-get-header
sieve-current-message
"Subject")))
text
(sieve-get-opt-arg
opt #:sender
(mu-message-get-sender sieve-current-message)))
(vacation-db-update sieve-current-message)
(if vacation-debug
(display "WILL REPLY\n")))
(vacation-debug
(display "WILL NOT REPLY\n"))))
;;; Register action
(if sieve-parser
(sieve-register-action "vacation"
action-vacation
(list 'string)
(list (cons "days" 'number)
(cons "addresses" 'string-list)
(cons "aliases" 'string-list)
(cons "subject" 'string)
(cons "sender" 'string)
(cons "mime" #f)
(cons "debug" #f))))
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