Extract Lua code into separate file

ffmuc-mesh-vpn-wireguard-vxlan/files/lib/gluon/gluon-mesh-wireguard-vxlan/checkuplink

@@ -1,10 +1,10 @@
 #!/bin/sh
 
 if { set -C; 2>/dev/null >/var/lock/checkuplink.lock; }; then
-		trap "rm -f /var/lock/checkuplink.lock" EXIT
+	trap "rm -f /var/lock/checkuplink.lock" EXIT
 else
-		echo "Lock file exists... exiting"
-		exit
+	echo "Lock file exists... exiting"
+	exit
 fi
 
 interface_linklocal() {
@@ -110,18 +110,7 @@ if [ "$(uci get wireguard.mesh_vpn.enabled)" == "true" ] || [ "$(uci get wiregua
 
 			logger -t checkuplink "Got data from wgkex broker: $WGKEX_DATA"
 
-			rm -f "/tmp/checkuplink-wgkex-parse"
-			cat >/tmp/checkuplink-wgkex-parse <<EOF
-local json = require 'jsonc'
-local input = arg[1]
-local data = json.parse(input)
-print(data.Endpoint.Address)
-print(data.Endpoint.Port)
-print(data.Endpoint.PublicKey)
-print(data.Endpoint.AllowedIPs[1])
-EOF
-
-			data=$(lua /tmp/checkuplink-wgkex-parse "$WGKEX_DATA")
+			data=$(lua /lib/gluon/gluon-mesh-wireguard-vxlan/parse-wgkex-response.lua "$WGKEX_DATA")
 			if [ $? -eq 1 ]; then
 				logger -t checkuplink "Parsing wgkex broker data failed"
 				exit 1

ffmuc-mesh-vpn-wireguard-vxlan/luasrc/lib/gluon/gluon-mesh-wireguard-vxlan/parse-wgkex-response.lua

@@ -0,0 +1,12 @@
+local json = require 'jsonc'
+
+local input = assert(arg[1])
+local data = assert(json.parse(input))
+if not data.Endpoint or not data.Endpoint.Address or not data.Endpoint.Port
+    or not data.Endpoint.PublicKey or not data.Endpoint.AllowedIPs or not data.Endpoint.AllowedIPs[1] then
+    error("Malformed JSON response, missing required value")
+end
+print(data.Endpoint.Address)
+print(data.Endpoint.Port)
+print(data.Endpoint.PublicKey)
+print(data.Endpoint.AllowedIPs[1])