I am newbie of laravel just authenticate 'username' and 'password' with database for successful login. //dd($userdata); got the input data

AdminAuthController

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use App\Http\Requests;
use App\Http\Controllers\Controller;
use Illuminate\Support\Facades\Validator;
use Illuminate\Support\Facades\Input;
use Illuminate\Support\Facades\Redirect;
use Illuminate\Support\Facades\Auth;
use DB;

class AdminAuthController extends Controller
{
	public function doLogin()
		{
			$rules = array(
				'email' => 'required|email',
				'password' => 'required|alphaNum|min:3'
			); 
			
			// run the validation rules on the inputs from the form
			$validator = Validator::make(Input::all(),$rules);
			
			// if the validator fails, redirect back to the form
			if($validator->fails()){
				
				return Redirect::to('gitadmin')
					->withErrors($validator)
					->withInput(Input::except('password'));
			}else{
				
				$userdata = array(
					'email' => Input::get('email'),
					'password' => Input::get('password')
				);

				
				if(Auth::attempt($userdata)){
					
					echo 'Success';
				
				}
				else{
					
					return Redirect::to('gitadmin');   
				}
			}
		}
}

#Routes File

Route::get('gitadmin',['as' => 'gitadmin','uses' => 'AdminAuthController@index']);
Route::post('gitadmin',['as' => 'gitadmin','uses' => 'AdminAuthController@doLogin']);
Route::get('/home','AdminAuthController@home');
Route::get('/signup','AdminAuthController@signup');