invoiceninja/app/Http/Controllers/Auth/ContactLoginController.php

<?php
/**
 * Invoice Ninja (https://invoiceninja.com)
 *
 * @link https://github.com/invoiceninja/invoiceninja source repository
 *
 * @copyright Copyright (c) 2019. Invoice Ninja LLC (https://invoiceninja.com)
 *
 * @license https://opensource.org/licenses/AAL
 */

namespace App\Http\Controllers\Auth;

use Illuminate\Http\Request;
use App\Http\Controllers\Controller;
use Auth;
use Route;

class ContactLoginController extends Controller
{
   
    protected $redirectTo = '/contact';

    public function __construct()
    {
      $this->middleware('guest:contact', ['except' => ['logout']]);
    }
    
    public function showLoginForm()
    {
      return view('auth.contact_login');
    }
    
    public function login(Request $request)
    {
      // Validate the form data
      $this->validate($request, [
        'email'   => 'required|email',
        'password' => 'required|min:6'
      ]);
      
      // Attempt to log the user in
      if (Auth::guard('contact')->attempt(['email' => $request->email, 'password' => $request->password], $request->remember)) {
        // if successful, then redirect to their intended location
        return redirect()->intended(route('contact.dashboard'));
      } 

      // if unsuccessful, then redirect back to the login with the form data
      return redirect()->back()->withInput($request->only('email', 'remember'));
    }
    
    public function logout()
    {
        Auth::guard('contact')->logout();
        return redirect('/contact/login');
    }
}