#!/usr/bin/env bash
# Save this file as revert-apache.sh and run: bash revert-apache.sh

HTTP_PORT=80
HTTPS_PORT=443

if [ "$1" == "--help" ] || [ "$1" == "-h" ]; then
	echo "Usage: $0 [force]"
	echo "Disable xVarnish and revert to the standard Apache configuration."
	echo -e "\n force  Do not prompt for confirmation if passed. (Optional)"
	exit 3
elif [ ! -f /var/cpanel/cpanel.config ]; then
	echo "$0 is for use with cPanel, which does not appear to be installed."
	exit 4
fi

[[ $# -eq 1 && "$1" = "force" ]] && is_force=true || is_force=false

if [ "$is_force" = false ]; then
	echo "Disable xVarnish and revert to the standard Apache configuration."
	echo
	echo "Steps performed:"
	echo "  1. Disable and kill non-critical xVarnish services"
	echo "  2. Remove Apache mod_xvarnish"
	echo "  3. Set HTTP and HTTPS to standard ports $HTTP_PORT, $HTTPS_PORT"
	echo "  4. Rebuild httpd.conf configuration with new ports"
	echo "  5. Stop Varnish Cache and Apache web services"
	echo "  6. Start Apache on ports $HTTP_PORT, $HTTPS_PORT"
	echo

	read -r -p "Do you wish to proceed? [y/N] " answer
	[[ ! "${answer,,}" =~ ^(yes|y)$ ]] && exit 6 || echo
fi

[ "$is_force" = true ] && echo "Starting $(basename "$0")"

# quick functions for reuse
el7_q() { type systemctl &>/dev/null; }
ea4_q() { [ -f /etc/cpanel/ea4/is_ea4 ]; }

disable() { el7_q && systemctl -q disable "$1" || /sbin/chkconfig "$1" on; }
killproc() { pgrep -x "$1" >/dev/null && pgrep -x "$1" | xargs -r kill -9; }

cp_set_option() {
	[[ $# -eq 2 && -n "$1" && -n "$2" ]] || return 3
	grep -qF "${1}=" /var/cpanel/cpanel.config || return 5
	sed -i "s/^${1}=.*/${1}=${2}/" /var/cpanel/cpanel.config
}

xv_set_option() {
	[[ $# -eq 2 && -n "$1" && -n "$2" ]] || return 3
	[ -f /usr/local/xvarnish/settings ] || return 4

	tmpfn=$(mktemp /usr/local/xvarnish/.settings.XXXXXX)
	sed "s/^${1} =.*/${1} = ${2}/" /usr/local/xvarnish/settings > "$tmpfn"
	if ! grep -qF "${1} = ${2}" "$tmpfn"; then
		echo "${1} = ${2}" >> "$tmpfn"
	fi
	/bin/mv -f "$tmpfn" /usr/local/xvarnish/settings
}

echo "[1] Disable and kill non-critical xVarnish services"
xv_set_option enable_varnish off
xv_set_option enable_healthcheck off

for name in xvhealth xvstats xvbeat; do
	disable "$name"
	killproc "$name"
done


echo "[2] Remove Apache mod_xvarnish"
modxv="/usr/local/apache/conf/conf.d/mod_xvarnish.conf" \
      && ea4_q && modxv="/etc/apache2/conf.modules.d/999_mod_xvarnish.conf"
[ -d "$(dirname "$modxv")" ] && : > "$modxv"

sopath="/usr/local/apache/modules/mod_xvarnish.so" \
      && ea4_q && sopath="/usr/lib64/apache2/modules/mod_xvarnish.so"

[ -f "$sopath" ] && /bin/rm -f "$sopath"


echo "[3] Set HTTP and HTTPS to standard ports $HTTP_PORT, $HTTPS_PORT"
cp_set_option apache_port "0.0.0.0:$HTTP_PORT"
cp_set_option apache_ssl_port "0.0.0.0:$HTTPS_PORT"

xv_chkconf="/usr/local/xvarnish/etc/conf.d/default/httpd.chksrv80"
chkconf="/usr/local/cpanel/src/chkservd/chkserv.d/httpd"
[ -f "$xv_chkconf" ] && /bin/cp -f "$xv_chkconf" "$chkconf"


echo "[4] Rebuild httpd.conf configuration with new ports"
out=$(/scripts/rebuildhttpdconf 2>&1)
[ $? -eq 0 ] || {
	echo "warning: /scripts/rebuildhttpdconf failed: ${out:-"(no output)"}"
}


echo "[5] Stop Varnish Cache and Apache web services"
/usr/local/cpanel/libexec/tailwatchd --stop &>/dev/null
disable varnish
killproc varnishd
killproc hitch
killproc httpd
killproc xvssl


echo "[6] Start Apache on ports $HTTP_PORT, $HTTPS_PORT"
el7_q && systemctl start httpd || service httpd start
sleep 1 && /usr/local/cpanel/libexec/tailwatchd --start &>/dev/null


echo -e "\nCompleted $(basename "$0")"