laravel5.4 login is not working with mongoDB

I am trying to implement laravel 5.4 auth. I am using mongoDB database. Collection name is user authenticated field is usrName and usrPassword. Password is not created using bcrypt. I am retrieving password using my own method. Currently I have implemented auth manually but login is not working. Please check and help me. Thanks.

For connecting mongodb and laravel I am using a package "http://ift.tt/2syFbmB"

web.php

Auth::routes();
Route::get('login', 'Auth\LoginController@showLoginForm')->name('login');
Route::post('login', 'Auth\LoginController@login');

login.blade.php (just added only important things)

<form role="form" method="POST" action="">
 
<input id="username" type="text" class="form-control" name="username" placeholder="Username" value="" required autofocus>
<input id="password" type="password" class="form-control" name="password" placeholder="Password" required>
<button type="submit" class="btn btn-primary btn-block btn-flat">Sign In</button>
</form>

LoginController.php

<?php

namespace App\Http\Controllers\Auth;

use App\Http\Controllers\Controller;
use Illuminate\Foundation\Auth\AuthenticatesUsers;
use Illuminate\Support\Facades\Auth;
use App\User;
use Illuminate\Http\Request;

class LoginController extends Controller
{
use AuthenticatesUsers;
protected $redirectTo = '/admin/dashboard';
public function username()
{
  return 'usrName';
}
public function __construct()
{
  $this->middleware('guest')->except('logout');
}

public function showLoginForm()
{
  return view('auth.login');
}

public function login(Request $request)
{
  $this->validate($request, [
            'username' => 'required|max:255',
            'password' => 'required|max:255'
  ]);

  $authUser = User::where('usrName', $request->username)->first();

  if (isset($authUser)) {
            $password = md5('aFGQ475SDsdfsaf2342' . $request->password . $authUser->usrPasswordSalt);

   if (Auth::attempt([$this->username() => $request->username, 'password' => $password])) {
             return 'logged in successfully : '.$this->username() . ' - ' . $password;
            }
   else {
         return 'oops something happend : '.$this->username() . ' - ' . $password;
         }
  }
}

auth.php (config)

'defaults' => [
        'guard' => 'web',
        'passwords' => 'user',
    ],
'guards' => [
        'web' => [
            'driver' => 'session',
            'provider' => 'user',
        ],

        'api' => [
            'driver' => 'token',
            'provider' => 'user',
        ],
    ],
'providers' => [
        'user' => [
            'driver' => 'eloquent',
            'model' => App\User::class,
        ],
'passwords' => [
        'user' => [
            'provider' => 'user',
            'table' => 'password_resets',
            'expire' => 60,
        ],
    ],

User.php

<?php

namespace App;

use Illuminate\Notifications\Notifiable;
use Jenssegers\Mongodb\Eloquent\Model as Eloquent;
use Illuminate\Auth\Authenticatable;
use Illuminate\Auth\Passwords\CanResetPassword;
use Illuminate\Foundation\Auth\Access\Authorizable;
use Illuminate\Contracts\Auth\Authenticatable as AuthenticatableContract;
use Illuminate\Contracts\Auth\Access\Authorizable as AuthorizableContract;
use Illuminate\Contracts\Auth\CanResetPassword as CanResetPasswordContract;

class User extends Eloquent implements AuthenticatableContract, AuthorizableContract, CanResetPasswordContract
{
    use Authenticatable, Authorizable, CanResetPassword;
    use Notifiable;
    protected $collection = 'user';
    public $timestamps = false;
    protected $fillable = [
        'usrName', 'usrPassword',
    ];
    protected $hidden = [
        'usrPassword', 'remember_token',
    ];
    public function getAuthPassword()
    {
        return $this->usrPassword;
    }
}

via Chebli Mohamed