Make my middleware roles to get the user and roles by using JWT-Auth APIs

I am working on tymon/jwt-auth. I am facing a problem when I integrate api and roles in my system. I can successfully get the token when I login the system. I don’t know how to get my token when I access admin.index view and how to make my middleware roles to get the user and roles when that user is login.

In my system, I have three roles. Members only can access some frontend pages but site owner and admin can access backend pages.

Here is my route.php

Route::group(['prefix' => 'api'], function()
    {
        Route::post('authenticate', 'AuthenticateController@authenticate');
        Route::post('register', 'AuthenticateController@register');
        Route::get('authenticate/user', 'AuthenticateController@getAuthenticatedUser');
        Route::get('logout', 'AuthenticateController@logout');
    });



     Route::group(array('prefix' => 'admin', 'namespace' => 'Admin',
            'middleware' => ['before' => 'jwt.auth', 'after' => 'role:siteowner|admin']
        ), function () {
        Route::get('/', function()
        {
            return view('admin.index');
        });
        Route::get('roles', 'RolesController@index');
        Route::get('roles/create', 'RolesController@create');
        Route::post('roles/store', 'RolesController@store');
        Route::get('roles/{id?}', 'RolesController@edit');
        Route::post('roles/{id?}','RolesController@update');
        Route::get('users', 'UsersController@index');
        Route::get('users/{id?}', 'UsersController@edit');
        Route::post('users/{id?}','UsersController@update');
        Route::get('homebanner', 'HomeBannerController@listView');
        Route::get('homebanner/recover', 'HomeBannerController@recoverView');
        Route::get('homebanner/create', 'HomeBannerController@create');
        Route::post('homebanner/store', 'HomeBannerController@store');

    });

Here is my AuthenticateController

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;

use App\Http\Requests;
use App\Http\Controllers\Controller;
use JWTAuth;
use Tymon\JWTAuth\Exceptions\JWTException;
use Illuminate\Support\Facades\Input;
use Illuminate\Support\Facades\Validator;
use App\User;
use App\Role;
use DB;
use Response;



class AuthenticateController extends Controller
{

    public function __construct()
    {
        // Apply the jwt.auth middleware to all methods in this controller
        // except for the authenticate method. We don't want to prevent
        // the user from retrieving their token if they don't already have it
        $this->middleware('jwt.auth', ['except' => ['authenticate', 'register']]);
    }

    public function authenticate(Request $request)
    {
        $credentials = $this->getCredentials($request);

        try {
            // verify the credentials and create a token for the user
            if (! $token = JWTAuth::attempt($credentials)) {
                return Response::json(['success' => false, 'message'=>  '電子郵件或密碼不正確！']);
            }
        } catch (JWTException $e) {
            // something went wrong
            return response()->json(['error' => 'could_not_create_token']);
        }

        // if no errors are encountered we can return a JWT
        return response([
            'status' => 'success',
            'message' => '成功登入會員',
            'token' => $token
        ]);
    }

    public function getAuthenticatedUser()
    {
        try {

            if (! $user = JWTAuth::parseToken()->authenticate()) {
                return response()->json(['user_not_found'], 404);
            }

        } catch (Tymon\JWTAuth\Exceptions\TokenExpiredException $e) {

            return response()->json(['token_expired'], $e->getStatusCode());

        } catch (Tymon\JWTAuth\Exceptions\TokenInvalidException $e) {

            return response()->json(['token_invalid'], $e->getStatusCode());

        } catch (Tymon\JWTAuth\Exceptions\JWTException $e) {

            return response()->json(['token_absent'], $e->getStatusCode());

        }

        $user = User::findOrFail($user->id);
        $roles = array();

        foreach($user->roles  as $role) {

            $roleArr = [
                'id' => $role->id,
                'name' => $role->name,
                'display_name' =>$role->display_name,
                'description' => $role->description,
                'created_at' => $role->created_at->toDateTimeString(),
                'updated_at' => $role->updated_at->toDateTimeString()
            ];

            $roles[] = $roleArr;
        }

        return  Response::json(array_merge($user->toArray(),['roles'=>$roles]));
    }

    public function register(Request $request){

        $input = $request->all();

        $rules = array(
            'email' => 'required|email|max:255|unique:users',
            'password' => 'required|min:6|confirmed',
            'password_confirmation' => 'required|min:6'
        );

        $validator = Validator::make($input, $rules);
        if ( $validator->fails() ){
            return Response::json(['success' => false, 'errors' => $validator->getMessageBag()->toArray()]);

        }else {

            $create = User::create([
                'email' => $request->input('email'),
                'password' => bcrypt($request->input('password')),
            ]);

            //when create a user, it will attach a member role
            $user = User::find($create->id);
            $role = Role::where('name', '=', 'member')->firstOrFail();
            $user->roles()->attach($role->id);

            $this->getCredentials($request);

            $token = JWTAuth::fromUser($user);

            return Response::json(['token' => $token, 'success' => true, 'message'=>  'success register']);
        }
    }

    public function logout()
    {
        $token = JWTAuth::getToken();
        if ($token) {
            JWTAuth::setToken($token)->invalidate();
            return Response::json(['success' => true, 'message'=>  'success logout']);
        }else{
            return Response::json(['success' => true, 'message'=>  'You have logout']);
        }

    }

    protected function getCredentials(Request $request)
    {
        return $request->only('email', 'password');
    }
}

here is my admin.php in middleware

<?php

namespace App\Http\Middleware;

use Closure;
use Illuminate\Support\Facades\Auth;


class Admin
{
    /**
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure  $next
     * @return mixed
     */
    public function handle($request, Closure $next)
    {
        $user = Auth::user();
        if($user->hasRole('admin'))
        {
            return $next($request);
        } else {
            return response('Unauthorized.', 401);
        }
    }
}