Laravel is an open source PHP web application framework designed to help developers easily build efficient web applications. Laravel Passport is part of the Laravel framework. It is an authentication server that implements the OAuth2 protocol and provides powerful support for API development. In this article, we will cover how to implement API authentication using Laravel Passport.

1. Install Laravel Passport

Before using Laravel Passport, we need to install it first. Laravel Passport can be installed by running the following command:

composer require laravel/passport

After the installation is complete, you also need to run the php artisan migrate command to create the required data tables.

2. Configure Authentication Middleware

To use Laravel Passport for API authentication, we need to use it in conjunction with Laravel's authentication middleware. You can add the corresponding authentication middleware for the API group in the app/Http/Kernel.php file:

protected $middlewareGroups = [
    'api' => [
        'throttle:60,1',
        IlluminateRoutingMiddlewareSubstituteBindings::class,
        LaravelPassportHttpMiddlewareCreateFreshApiToken::class,
    ],
];

Among them, the CreateFreshApiToken middleware will be used in each request Check the API token in and automatically refresh it if needed.

3. Create API authentication route

Next, we need to create the corresponding authentication route for the API. The following routes can be added in the routes/api.php file:

Route::post('login', 'APIAuthController@login');
Route::post('register', 'APIAuthController@register');

Route::group(['middleware' => ['auth:api']], function() {
    Route::get('details', 'APIAuthController@details');
    // 添加更多需要登錄才能訪問的API路由
});

In the above code, the auth:api middleware will ensure that only those who have been authenticated Only users can access these routes. AuthController is the controller we will create later that contains the logic to handle authentication and API routing.

4. Create API Authentication Controller

Now, we need to create the controller that handles API authentication and routing. AuthController can be created using the following command:

php artisan make:controller API/AuthController

AuthController should contain the following method:

use IlluminateHttpRequest;
use IlluminateSupportFacadesAuth;
use IlluminateSupportFacadesValidator;
use AppUser;

class AuthController extends Controller
{
    /**
     * 用戶注冊(cè)
     *
     * @param  IlluminateHttpRequest  $request
     * @return IlluminateHttpResponse
     */
    public function register(Request $request)
    {
        $validator = Validator::make($request->all(), [
            'name' => 'required|string|max:255',
            'email' => 'required|string|email|unique:users',
            'password' => 'required|string|min:6',
        ]);

        if ($validator->fails()){
            return response(['errors'=>$validator->errors()->all()], 400);
        }

        $request['password'] = bcrypt($request['password']);
        $user = User::create($request->toArray());
        $token = $user->createToken('MyApp')->accessToken;
        return response(['token' => $token], 200);
    }

    /**
     * 用戶登錄
     *
     * @param  IlluminateHttpRequest  $request
     * @return IlluminateHttpResponse
     */
    public function login(Request $request)
    {
        $validator = Validator::make($request->all(), [
            'email' => 'required|string|email',
            'password' => 'required|string',
        ]);

        if ($validator->fails()) {
            return response(['errors'=>$validator->errors()->all()], 400);
        }

        if (!Auth::attempt(['email' => $request['email'], 'password' => $request['password']])) {
            return response(['message' => 'Invalid login credentials'], 400);
        }

        $user = $request->user();
        $token = $user->createToken('MyApp')->accessToken;
        return response(['token' => $token], 200);
    }

    /**
     * 獲取用戶詳細(xì)信息
     *
     * @param  IlluminateHttpRequest  $request
     * @return IlluminateHttpResponse
     */
    public function details(Request $request)
    {
        return response()->json(['user' => $request->user()], 200);
    }
}

register() method Used for user registration, the login() method is used for user login, and the details() method is used to obtain the detailed information of the logged in user. It should be noted that the register() and login() methods will create a new API token for the authenticated user and return it to the client.

5. Testing API Authentication

Now we can test API authentication by sending username and password. The following command can be executed using a tool like Postman or curl:

curl -X POST 
  http://your-app-url/api/login 
  -H 'content-type: application/json' 
  -d '{
    "email": "user@example.com",
    "password": "password"
}'

If the username and password are correct, a response containing the API token will be received:

{
    "token": "eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImp0aSI6ImU4YmI2Njk0MGEyNmIzY2Q2ZmY4M2Q3MjQ5ZjgzODE1MTI2ZmRkMDIyM2YyMzVmOGZmNjhlOWM5NGU2Mzk4ZTU3ZWZiMDJhNmQyZmRlZjA2In0.eyJhdWQiOiIxIiwianRpIjoiZThiYjY2OTAwZTI2YjNjZDZmZjgzZDcyNDlmODM4MTUxMjZmZGQwMjIzZjIzNWY4ZmY2OGU5Yzk0ZTYzOThlNTdlZmIwMmE2ZDJmZGVmMDYiLCJpYXQiOjE2Mjg5NDM3NzQsIm5iZiI6MTYyODk0Mzc3NCwiZXhwIjoxNjMxMDQ5Nzc0LCJzdWIiOiIxIiwic2NvcGVzIjpbXX0.toR762TgsNDarQZs6azl-jg-tP2996vzUc-LOQB90Twcb0Y3BC5vrd3jDW70QQw961MwV_sFrU1dhyKLMN76lG6B03zv6GjU6tLHyrqQi88t0clSrVupAcaQHOAB0gGLBRAOc5Ql1z9CHXx8f_FkA3RVC4htHNTk_r0mM-szWcf1sRONQYaARPDFl7ZJwj1_wYB7M6dcpiEDDhpyzmRFPv7pYyX8805BL4yg6z-Kmxc-DW4GSS4NTBxnctwGPf9w8fYc2zJGHXmT6OtqVjuqKDdFQgxIQhEkeSldBZmzTIPIR_tTa8Ub3Cxlx69zAfJTHosXwPYQOO03LBJwNVdjeLIkKgQK1PcAXD2kN4-RuyTEMXYNQ0wRGaHIb3vxwqVdjrrVE9yrDMIpAPRgzFwzXbJWvKmxzZpFTUz9RvIqUFt2zNbIG5kLOUyvmKIqO-aTISCT0wu0T0ZEq-DpXJ7-C6z-M0cJJP37y7eV4jdAMx7yD9jT85Knv4_hjLyKvF4We5DSSOYjeIVoq3XHNJdmYJ7X3ph6Ko1CfdtVKNVf20Vx8Z_Zi-pe9bTY0n-tSkwDvVXpVOrb3BOalq7MbOpTe8Klf9uZ_ZIDqTlTnrYV_oh_5isrImv7r8D1NX1G4p9jRcI16MEFDE"
}

Then, another command can be used To access routes that require authentication:

curl -X GET 
  http://your-app-url/api/details 
  -H 'authorization: Bearer <token>'

In the above command, replace <token> with the API token obtained in the previous step. If the token is valid, you will get an authenticated response:

{
    "user": {
        "id": 1,
        "name": "User",
        "email": "user@example.com",
        "email_verified_at": null,
        "created_at": "2021-08-13T02:58:04.000000Z",
        "updated_at": "2021-08-13T02:58:04.000000Z"
    }
}

6. Summary

In this article, we covered how to implement API authentication using Laravel Passport. Using Laravel Passport, you can easily add strong authentication support to your web API, making your user data more secure. Laravel Passport also provides other powerful features such as API access token management and OAuth2 client management. If you are a Laravel developer, be sure to learn more about Laravel Passport and use it in your next web project.

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