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[etc/mutt.git] / .mutt / sendmail-checks.d / check-attachments
1 #!/bin/sh
2 #
3 # check-attachments — check that referenced attachments are actually attached
4 #
5 # This is based on the idea behind
6 # http://www.vim.org/scripts/download_script.php?src_id=3165: if the mail body
7 # matches a given regular expression, then check whether there are also
8 # non-PGP MIME parts in the message, or else refuse to send the message.
9 #
10 # You can override the checking by adding the X-No-Attachments header to the
11 # message.
12 #
13 # Copyright © 2010 martin f. krafft <madduck@madduck.net>
14 # Released under the terms of the Artistic Licence 2.0
15 #
16 set -eu
17
18 RE_ENGLISH='attach(ing|ed|ment)?|included\W+(with|in)\W+th(is|e\W+(curr|pres)ent)\W+mail'
19 RE_GERMAN='an(geh(ä|=E4|=C3=A4)ngt|h(ä|=E4|=C3=A4)ngsel|bei)|bei(gef(ü|=FC|=C3=BC)gt|lage)|(im|siehe)\W+(anhang|beilage)'
20 RE_FRENCH='attach(e|er|(é|=E9|=C3=A9)e?s?|ement|ant)'
21 OVERRIDE_HEADER=X-No-Attach
22
23 if ! grep -qi "^${OVERRIDE_HEADER}:" "$1" \
24     && egrep -v '^(> |Content-Disposition:)' "$1" | egrep -qzi "($RE_ENGLISH|$RE_GERMAN|$RE_FRENCH)"; then
25
26   nr_attach=$(sed -rne 's/^Content-Type:[[:space:]]+//pi' "$1" |
27               egrep -civ '^(multipart/|application/pgp-signature)')
28
29   if [ $nr_attach -lt 2 ]; then
30     echo >&2 "E: the mail message likely references an attachment,"
31     echo >&2 "E: but there seems to be no non-PGP MIME part."
32     echo >&2 "E: (add the $OVERRIDE_HEADER header to override the check)."
33     exit 1
34   fi
35 fi
36
37 sed -i -e "/^${OVERRIDE_HEADER}:/d" "$1"