[refactor] Move validation to validator

app.js

@@ -31,19 +31,15 @@ sessions.history = [];
 
 const getSession = sessionFinder(sessions);
 
-bot.use((ctx, next) =>
-	validator(ctx)
-		.then(next)
-		.catch(responder.fail(
-			`Username Not authenticated!`
-		)));
-
 // get os info
 const home  = os.homedir();
 const hostname = os.hostname();
 const username = os.userInfo().username;
 const defaultShell = os.platform() === 'win32' ? 'cmd.exe' : 'bash';
 
+// Validate bot's master
+bot.use(validator);
+
 bot.command('start',
 	ctx => {
 		const newProc = spawn(defaultShell, {

lib/validator.js

@@ -1,10 +1,15 @@
 const { path } = require('../util/index.js');
 const config = require('../config.js');
+const responder = require('./responseHandler.js');
 
 const validate =
-	ctx => {
+	(ctx, next) => {
 		if(!path(['update', 'message', 'from', 'id'], ctx)) return Promise.reject(ctx);
-		return (ctx.update.message.from.id === config.masterID) ? Promise.resolve(ctx) : Promise.reject(ctx);
-	}
+		return ((ctx.update.message.from.id === config.masterID)
+			? Promise.resolve(ctx)
+			: Promise.reject(ctx))
+				.then(next)
+				.catch(responder.fail('Username not authenticated.'));
+	};
 
 module.exports = validate;