refactor(start): assert payload file extension and allow to omit it

Author: fraxken

src/commands/http.js

@@ -4,9 +4,20 @@ import path from "node:path";
 // Import Internal Dependencies
 import { buildServer } from "../http-server/index.js";
 
-export async function start(json = "nsecure-result.json", options = {}) {
+export async function start(
+  payloadFileBasename = "nsecure-result.json",
+  options = {}
+) {
   const port = Number(options.port);
-  const dataFilePath = path.join(process.cwd(), json);
+  const fileExtension = path.extname(payloadFileBasename);
+  if (fileExtension !== ".json" && fileExtension !== "") {
+    throw new Error("You must provide a JSON file (scanner payload) to open");
+  }
+
+  const dataFilePath = path.join(
+    process.cwd(),
+    fileExtension === "" ? `${payloadFileBasename}.json` : payloadFileBasename
+  );
 
   const httpServer = buildServer(dataFilePath, {
     port: Number.isNaN(port) ? 0 : port