luci.https-dns-proxy

#!/bin/sh
# Copyright 2023 MOSSDeF, Stan Grishin (stangri@melmac.ca)
# shellcheck disable=SC1091,SC2039,SC3043

# TechRef: https://openwrt.org/docs/techref/rpcd

# ubus -v list luci.https-dns-proxy
# ubus -S call luci.https-dns-proxy getInitList '{"name": "https-dns-proxy" }'
# ubus -S call luci.https-dns-proxy getInitStatus '{"name": "https-dns-proxy" }'
# ubus -S call luci.https-dns-proxy getPlatformSupport '{"name": "https-dns-proxy" }'
# ubus -S call luci.https-dns-proxy getProviders '{"name": "https-dns-proxy" }'
# ubus -S call luci.https-dns-proxy getRuntime '{"name": "https-dns-proxy" }'

readonly packageName="https-dns-proxy"
readonly providersDir="/usr/share/${packageName}/providers"

. /lib/functions.sh
. /usr/share/libubox/jshn.sh

is_enabled() { "/etc/init.d/${1}" enabled; }
is_running() { [ "$(ubus call service list "{ 'name': '$1' }" | jsonfilter -q -e "@['$1'].instances[*].running" | uniq)" = 'true' ]; }
get_version() { /usr/sbin/https-dns-proxy -V; }
check_http2() { curl --version | grep -q 'nghttp2'; }
check_http3() { curl --version | grep -q 'nghttp3'; }
ubus_get_ports() { ubus call service list "{ 'name': '$packageName' }" | jsonfilter -e "@['${packageName}'].instances[*].data.firewall.*.dest_port"; }
logger() { /usr/bin/logger -t "$packageName" "$@"; }
print_json_bool() { json_init; json_add_boolean "$1" "$2"; json_dump; json_cleanup; }

get_init_list() {
	local name="$1"
	json_init
	json_add_object "$name"
	if is_enabled "$name"; then
		json_add_boolean 'enabled' '1'
	else
		json_add_boolean 'enabled' '0'
	fi
	if is_running "$name"; then
		json_add_boolean 'running' '1'
	else
		json_add_boolean 'running' '0'
	fi
	json_close_object
	json_dump
	json_cleanup
}

get_init_status() {
	local name
	local i ports
	local version
	name="$(basename "$1")"
	name="${name:-$packageName}" 
	ports="$(ubus_get_ports)"
	[ -z "$version" ] && version="$(get_version "$name")"
	json_init
	json_add_object  "$name"
	if is_enabled "$name"; then
		json_add_boolean 'enabled' '1'
	else
		json_add_boolean 'enabled' '0'
	fi
	if is_running "$name"; then
		json_add_boolean 'running' '1'
	else
		json_add_boolean 'running' '0'
	fi
	if [ -n "$ports" ]; then
		json_add_boolean 'force_dns_active' '1'
		json_add_array 'force_dns_ports'
			for i in $ports; do json_add_int '' "$i"; done
		json_close_array
	else
		json_add_boolean 'force_dns_active' '0'
	fi
	json_add_string 'version' "$version"
	json_close_array
	json_close_object
	json_dump
	json_cleanup
}

get_platform_support() {
	local name
	name="$(basename "$1")"
	name="${name:-$packageName}" 
	json_init
	json_add_object "$name"
	if check_http2; then
		json_add_boolean 'http2_support' '1'
	else
		json_add_boolean 'http2_support' '0'
	fi
	if check_http3; then
		json_add_boolean 'http3_support' '1'
	else
		json_add_boolean 'http3_support' '0'
	fi
	json_close_object
	json_dump
	json_cleanup
}

get_providers() {
	local f
	echo '{"https-dns-proxy":['
	for f in "$providersDir"/*; do
		cat "$f"
		echo ','
	done
#	echo '{ "title": "Custom", "template": "{option}", "params": { "option": { "type": "text", }, }, },'
	echo ']}'
}

get_runtime() { ubus call service list "{ 'verbose': true, 'name': '$1' }"; }

set_init_action() {
	local name="$1" action="$2" cmd
	case $action in
		enable|disable|start|stop|restart)
			cmd="/etc/init.d/${name} ${action}"
		;;
	esac
	if [ -n "$cmd" ] && eval "$cmd" >/dev/null 2>&1; then
		print_json_bool "result" '1'
	else
		print_json_bool "result" '0'
	fi
}

case "$1" in
	list)
		json_init
		json_add_object "getInitList"
			json_add_string 'name' "name"
		json_close_object
		json_add_object "getInitStatus"
			json_add_string 'name' 'name'
		json_close_object
		json_add_object "getPlatformSupport"
			json_add_string 'name' 'name'
		json_close_object
		json_add_object "getProviders"
			json_add_string 'name' "name"
		json_close_object
		json_add_object "getRuntime"
			json_add_string 'name' "name"
		json_close_object
		json_add_object "setInitAction"
			json_add_string 'name' "name"
			json_add_string 'action' "action"
		json_close_object
		json_dump
		json_cleanup
		;;
	call)
		case "$2" in
			getInitList)
				read -r input
				json_load "$input"
				json_get_var name "name"
				json_cleanup
				get_init_list "$name"
				;;
			getInitStatus)
				read -r input
				json_load "$input"
				json_get_var name 'name'
				json_cleanup
				get_init_status "$name"
				;;
			getPlatformSupport)
				read -r input
				json_load "$input"
				json_get_var name 'name'
				json_cleanup
				get_platform_support "$name"
				;;
			getProviders)
				read -r input
				json_load "$input"
				json_get_var name "name"
				json_cleanup
				get_providers "$name"
				;;
			getRuntime)
				read -r input
				json_load "$input"
				json_get_var name "name"
				json_cleanup
				get_runtime "$name"
				;;
			setInitAction)
				read -r input
				json_load "$input"
				json_get_var name "name"
				json_get_var action "action"
				json_cleanup
				set_init_action "$name" "$action"
				;;
		esac
	;;
esac