#!/bin/sh
set -eu
. /usr/libexec/haproxy-manager/common.sh

[ "$(uci_get main webhook_enabled 0)" = 1 ] || exit 0
URL="$(uci_get main webhook_url)"
case "$URL" in
	http://*) AUTHORITY="${URL#http://}" ;;
	https://*) AUTHORITY="${URL#https://}" ;;
	*) echo "Webhook URL must use HTTP or HTTPS" >&2; exit 1 ;;
esac
[ -n "${AUTHORITY%%/*}" ] || { echo "Webhook URL must include a host" >&2; exit 1; }
case "$URL" in
	*[![:graph:]]*) echo "Webhook URL contains invalid characters" >&2; exit 1 ;;
esac
if command -v uclient-fetch >/dev/null 2>&1; then
	FETCHER=uclient-fetch
elif command -v wget >/dev/null 2>&1; then
	FETCHER=wget
else
	echo "A compatible wget implementation is required for webhook delivery" >&2
	exit 1
fi
[ -r /usr/share/libubox/jshn.sh ] || { echo "jshn.sh is not available" >&2; exit 1; }

INCIDENT_ID="$(printf '%s' "${1:-unknown}" | tr -cd '0-9-')"
RESULT="$(printf '%s' "${2:-unknown}" | tr -cd 'A-Za-z0-9_.:-')"
ACTION="$(printf '%s' "${3:-unknown}" | tr -cd 'A-Za-z0-9_.:-')"
INTERFACE="$(printf '%s' "${4:-unknown}" | tr -cd 'A-Za-z0-9_.:-')"
REASON="$(printf '%s' "${5:-unknown}" | tr -cd 'A-Za-z0-9_.:-')"

. /usr/share/libubox/jshn.sh
json_init
json_add_string event haproxy-manager-recovery
json_add_string incident "$INCIDENT_ID"
json_add_string result "$RESULT"
json_add_string action "$ACTION"
json_add_string interface "$INTERFACE"
json_add_string reason "$REASON"
PAYLOAD="$(json_dump)"

"$FETCHER" -q -T 10 -O /dev/null \
	--header='Content-Type: application/json' \
	--post-data="$PAYLOAD" "$URL"