#!/bin/sh

# periodic(8) script that runs sa-update on a nightly basis, updating
# SpamAssassin rules if needed. Relies on sa-update command.
#
# Originally contributed by: Jeremy Chadwick <koitsu@FreeBSD.org>
# Extended and enhanced by: Matthew Seaman <m.seaman@infracaninophile.co.uk>
#
# Define these variables in either /etc/periodic.conf or
# /etc/periodic.conf.local to override the defaults.
#
# Configuration Settings (with default values):
#
# daily_sa_enable="YES"
#          run sa-update(1) daily.  We assume you want this since
#          you've installed the port.
#
# daily_sa_quiet="NO"
#           discard output from sa-update, sa-compile, sa-spamd if set
#           to YES.  sa-compile in particular is quite verbose, so
#           setting this to YES can avoid some occasional excess
#           verbiage in your daily e-mails.
#
# daily_sa_update_flags=""
#           flags to pass to sa-update. eg. to download additional
#           updates from saupdates.example.com, signed with a GPG key
#           with fingerprint 0xCAFEBABE which you have previously
#           downloaded and installed into the sa-update keyring:
#               daily_sa_update_flags="--gpgkey CAFEBABE \
#                    --channel saupdates.example.com     \
#                    --channel updates.spamassassin.org"  
#
# daily_sa_compile="%%SACOMPILE%%"
#           run sa-compile to create a compiled form of the filter
#           rules when new rules are found.  Note: this can be time
#           consuming and CPU intensive.
#
# daily_sa_compile_flags=""
#           flags to pass to sa-compile. eg to enable debug output
#               daily_sa_compile_flags="-D"
#
# daily_sa_compile_nice="YES"
#           run sa-compile via nice(1) to minimize its impact on the
#           the system.
#
# daily_sa_compile_nice_flags=""
#           flags to pass to nice(1).  eg to use a priority increment
#           different than the default.
#               daily_sa_compile_nice_flags="-n 16"
#
# daily_sa_restart_spamd="YES"
#           automatically restart sa-spamd when new rules are found.
#           If daily_sa_compile is enabled, only restart if new rules
#           are found and compilation succeeds  

# If there is a global system configuration file, suck it in.
#
if [ -r /etc/defaults/periodic.conf ]
then
    . /etc/defaults/periodic.conf
    source_periodic_confs
fi

: ${daily_sa_enable="YES"}
: ${daily_sa_quiet="NO"}
: ${daily_sa_compile="%%SACOMPILE%%"}
: ${daily_sa_compile_nice="YES"}
: ${daily_sa_restart_spamd="YES"}

PATH=/bin:/sbin:/usr/bin:/usr/sbin:%%LOCALBASE%%/bin:%%LOCALBASE%%/sbin
export PATH

update_rules() {
    echo
    echo "Checking for new SpamAssassin rules:"

    eval sa-update ${daily_sa_update_flags} ${_output} || rc=$?

    return $rc
}

# If enabled, run sa-compile to compile the updated rulesets.  This
# can require significant time and CPU.
compile_rules() {
    case "$daily_sa_compile_nice" in
        [Yy][Ee][Ss])
            _nice="nice $daily_sa_compile_nice_flags"
            ;;
	*)
            _nice=
            ;;
    esac

    case "$daily_sa_compile" in
	[Yy][Ee][Ss])
	    echo "  Compiling new rules"
	    eval ${_nice} sa-compile ${daily_sa_compile_flags} ${_output} || rc=$?

	    if [ $rc -ne 0 ] ; then
		echo "Error: sa-compile exited with code $rc"
		rc=3
	    fi
	    ;;

	*)  ;;			# Do nothing
    esac

    return $rc
}

# If update_rules() downloads new rules, and if compile_rules succeeds
# or is not enabled, then restart the spamd daemon.
restart_spamd() {
    case "$daily_sa_restart_spamd" in
	[Yy][Ee][Ss])
	    echo "  Restarting sa-spamd"
	    eval %%LOCALBASE%%/etc/rc.d/sa-spamd restart ${_output} || rc=$?

	    if [ $rc -ne 0 ] ; then
		echo "Error: failed to restart sa-spamd"
		rc=3
	    fi
	    ;;

	*)  ;;			# Do nothing
    esac

    return $rc
}

rc=0
case "$daily_sa_enable" in
    [Yy][Ee][Ss])
	case ${daily_sa_quiet} in
	    [Yy][Ee][Ss])
		_output='>/dev/null 2>&1'
		;;
	    *)
		_output=
		;;
	esac

	# In FreeBSD 12.0 the anticongestion function should be used
	# instead of a hard-coded sleep
	if [ -n "$anticongestion_sleeptime" ]; then
	    anticongestion
	else
	    sleep $( jot -r 1 0 300 )
	fi

	update_rules || rc=$?
	case ${rc} in
	    0)
		echo "Successfully downloaded updated rules"
		compile_rules && \
		    restart_spamd
		;;
	    1)
		echo "No new rules available."
		rc=0
		;;
	    *)
		echo "Error: sa-update exited with code ${rc}"
		rc=3
		;;
	esac
	;;

    *)	;;			# Nothing to do
esac

exit $rc