#!/bin/sh

# Exit codes
EX_TEMPFAIL=75
EX_UNAVAILABLE=69

# Tools
DELIVER="/usr/lib/dovecot/deliver"
SPAMC="/usr/bin/spamc"

log_and_quit() {
	/usr/bin/logger -s -p mail.warning -t deliver "$*"
	exit $EX_TEMPFAIL
}

# Simple checks
[ -x $DELIVER ] || log_and_quit "Missing binary: $DELIVER"

#
# If spamassassin client is available, and spamassassin requested 
# pipe mail through it
#
if [ -x $SPAMC -a -d $HOME/.spamassassin ] ; then
	umask 077

	OUTPUT="`mktemp /tmp/mailfilter.XXXXXXXXXX`"
	if [ "$?" != 0 ]; then
    		log_and_quit "Unable to create temporary file."
	fi

	# Clean up when done or when aborting.
	trap "rm -f $OUTPUT" EXIT SIGTERM

	# calls spamc
	$SPAMC > $OUTPUT
	if [ "$?" != 0 ]; then
		log_and_quit "Temporary SpamAssassin failure (spamc return $return)"
	fi

	$DELIVER < $OUTPUT

#
# If spamassassin client is not available, deliver directly
#
else
	$DELIVER
fi

exit $?