#!/bin/bash
#
# This file is an example post-data hook that will run standard filtering
# utilities if they are available.
#
#  - spamc (from Spamassassin) to filter spam.
#  - clamdscan (from ClamAV) to filter virus.
#
# If it exits with code 20, it will be considered a permanent error.
# Otherwise, temporary.

set -e

TF="$(mktemp --tmpdir "post-data-XXXXXXXXXX")"
trap 'rm "$TF"' EXIT

# Save the message to the temporary file, so we can pass it on to the various
# filters.
cat > "$TF"


if command -v spamc >/dev/null; then
        if ! SL=$(spamc -c - < "$TF") ; then
                echo "spam detected"
                exit 20  # permanent
        fi
        echo "X-Spam-Score: $SL"
fi


if command -v clamdscan >/dev/null; then
        if ! clamdscan --no-summary --infected - < "$TF" 1>&2 ; then
                echo "virus detected"
                exit 20  # permanent
        fi
        echo "X-Virus-Scanned: pass"
fi