luci/applications/luci-app-https-dns-proxy/root/usr/libexec/rpcd/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" }'

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

. "${IPKG_INSTROOT}/lib/functions.sh"
. "${IPKG_INSTROOT}/usr/share/libubox/jshn.sh"

is_enabled() { "/etc/init.d/${1}" enabled >/dev/null 2>&1; }
is_running() { "/etc/init.d/${1}" running >/dev/null 2>&1; }
get_version() { /usr/sbin/https-dns-proxy -V | head -1; }
check_http2() { /usr/sbin/https-dns-proxy -V | grep -q 'nghttp2'; }
check_http3() { /usr/sbin/https-dns-proxy -V | 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
	name="$(basename "$1")"
	name="${name:-${packageName}}" 
	json_init
	json_add_object "$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_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":'
	if [ -s "$providersJson" ]; then
		cat "$providersJson"
	else
		echo '['
		for f in "$providersDir"/*; do
			cat "$f"
			echo ','
		done
		echo ']'
	fi
	echo '}'
}

set_init_action() {
	local action="$2" cmd
	[ "$(basename "$1")" = "$packageName" ] || { print_json_bool 'result' '0'; return 1; }
		case $action in
		enable|disable|start|stop|restart)
			cmd="/etc/init.d/${packageName} ${action}"
		;;
	esac
	if [ -n "$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 "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 "$name"
				;;
			setInitAction)
				read -r input
				json_load "$input"
				json_get_var name "name"
				json_get_var action "action"
				json_cleanup
				set_init_action "$name" "$action"
				;;
		esac
	;;
esac