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350ec449ac0a1cf3449cf7ae66fe421ae216574d
[etc/neomutt.git] / .config / neomutt / sendmail-checks.d / ack-recipients
1 #!/bin/sh
2 #
3 # ack-recipients – require double-checking of some recipients
4 #
5 # refuse to send a mail as long as recipients listed in
6 # ~/.config/mutt/ack-recipients are not individually "signed-off" by adding
7 # their e-mail addresses to the X-Acked header. This header is removed from
8 # the mail before it is sent.
9 #
10 # The file ~/.config/mutt/ack-recipients stores sha256sums of lower-cased
11 # e-mail addresses (no newline) instead of the addresses themselves as a
12 # measure to protect privacy. You can get new lines like this:
13 #
14 #   printf my.new@e-mail.addre.ss | tr '[[:upper:]]' '[[:lower:]]' \
15 #     | sha256sum | sed -e 's, .*,,'
16 #
17 # E.g. my address (see below) will become
18 #   84d5b33c9376f67274c2ec9ce0e03b6973fb8bc943ebd7abb470c903c47e00f4
19 #
20 # Copyright © 2010 martin f. krafft <madduck@madduck.net>
21 # Released under the terms of the Artistic Licence 2.0
22 #
23 set -eu
24
25 CHECKLIST="$HOME/.config/mutt/ack-recipients"
26 HEADER=X-Acked
27 ACKED_RCPTS=$(formail -czx ${HEADER}: < $1 | sed -re 's/,\s*/ /g' | tr '[[:upper:]]' '[[:lower:]]')
28 MAILFILE="$1"; shift
29
30 ret=0
31 for r in $@; do
32   ack=0
33   # check if this recipient is in the list of acked recipients
34   rl=$(printf $r | tr '[[:upper:]]' '[[:lower:]]')
35   for a in $ACKED_RCPTS; do [ $a = $rl ] && ack=1 && break; done
36   rs=$(printf $rl | sha256sum)
37   # now check if this unacked recipient needs to be acked
38   if [ $ack -eq 0 ] && grep -q "^${rs%% *}$" "$CHECKLIST"; then
39     echo >&2 "E: will not send mail until $r has been added to the $HEADER header"
40     ret=1
41   fi
42 done
43
44 [ $ret -eq 0 ] || exit $ret
45
46 # now remove the X-Acked header from the mail
47 TMPFILE=$(mktemp --tmpdir mutt-sendmail.XXXXXXXXXX.msg)
48 settrap () { trap "$@" 0 1 2 3 4 5 6 7 8 10 11 12 13 14 15; }
49 cleanup () { rm -f "$TMPFILE"; settrap -; }
50 settrap cleanup
51 formail -I ${HEADER}: < "$MAILFILE" > "$TMPFILE"
52 mv "$TMPFILE" "$MAILFILE"
53 settrap -