#!/bin/sh
# mencrypt PLAINMSG - generate a PGP/MIME signed and encrypted message

[ -f "$1" ] || exit 1

IFS='
'
FLAGS=$(mhdr -d -A -h from:to:cc:bcc: "$1" |sort -u |sed 's/^/--recipient=/')

TMPD=$(mktemp -d -t mencrypt.XXXXXX)
trap "rm -rf '$TMPD'" INT TERM EXIT

awk '/^$/,0' "$1" |
	mmime |
	gpg --armor --encrypt --sign $FLAGS -o $TMPD/msg.asc ||
	exit $?

printf 'Version: 1\n' >$TMPD/version

{
	sed '/^$/q' "$1"
	printf '#application/pgp-encrypted %s/version\n' "$TMPD"
	printf '#application/octet-stream %s/msg.asc\n' "$TMPD"
} |
	mmime -t 'multipart/encrypted; protocol="application/pgp-encrypted"'