implemented some login stuff.

app/Exceptions/Handler.ts

@@ -15,6 +15,7 @@
 
 import Logger from '@ioc:Adonis/Core/Logger'
 import HttpExceptionHandler from '@ioc:Adonis/Core/HttpExceptionHandler'
+import { HttpContextContract } from '@ioc:Adonis/Core/HttpContext'
 
 export default class ExceptionHandler extends HttpExceptionHandler {
   protected statusPages = {
@@ -26,4 +27,21 @@ export default class ExceptionHandler extends HttpExceptionHandler {
   constructor() {
     super(Logger)
   }
+
+  public async handle(error: any, ctx: HttpContextContract) {
+    const { session, response } = ctx;
+
+    /**
+     * Handle failed authentication attempt
+     */
+    if (['E_INVALID_AUTH_PASSWORD', 'E_INVALID_AUTH_UID'].includes(error.code)) {
+      session.flash('errors', { login: error.message });
+      return response.redirect().back();
+    }
+
+    /**
+     * Forward rest of the exceptions to the parent class
+     */
+    return super.handle(error, ctx);
+  }
 }