How to use OpenID Connect for API authentication in PHP

In today's digital era, API authentication has become a widely used technical means. To keep API information secure, many websites and applications use the OpenID Connect protocol for authentication. This protocol allows you to use a third-party identity provider (IdP) to authenticate users and provide your API with the ability to exchange identity tokens and access tokens. In this article, we will explore how to use OpenID Connect for API authentication in PHP.

1. Install PHP development package

First, you need to install the relevant PHP development package of OpenID Connect in your PHP project to use the OpenID Connect API in your application . If you use the Composer Action Manager, execute the following command in your project root directory to download and install:

composer require php-openid/php-openid-connect

If you don't Using Composer, you can install it manually by downloading the OpenID Connect PHP package from GitHub and placing it in your project directory.

2. Register your application

To start using the OpenID Connect protocol, you need to register your application with the provider of your choice and obtain a client ID and client secret . The registration process may vary depending on the provider you use, but most providers' registrations are set up based on the OAuth2 specification.

3. Writing Authentication Code

Once you have installed the OpenID Connect package into your PHP project and registered your application, you can start writing the authentication code.

In this example, we will use Auth0 as the open ID provider. First, you need to set up configuration options, filling in your client ID and client secret:

require_once "vendor/autoload.php";

$config = [
    'auth0' => [
        'domain' => 'YOUR_AUTH0_DOMAIN',
        'client_id' => 'YOUR_AUTH0_CLIENT_ID',
        'client_secret' => 'YOUR_AUTH0_CLIENT_SECRET',
        'redirect_uri' => 'YOUR_AUTH0_REDIRECT_URI',
        'scope' => 'openid profile email'
    ]
];

Next, you need to create an authentication object and build the authentication URL:

$auth0 = new Auth0SDKAuth0($config['auth0']);
$auth_url = $auth0->get_login_url();

This will present the user with a login page where they will need to enter their credentials to authenticate. Once the user has authenticated, the code will be redirected to the provided URI by setting the redirect URI.

You then need to obtain the access token by getting the authorization code:

$auth0 = new Auth0SDKAuth0($config['auth0']);
$access_token = $auth0->get_access_token();

At this point, you have successfully completed authentication and obtained the access token from the OpenID Connect exchange service. You can now use this access token to access the protected API endpoint and authorize user requests with it.

4. Use access token to access API

You can use the obtained access token to make requests to the protected API endpoint to access relevant data and resource.

$auth0 = new Auth0SDKAuth0($config['auth0']);
$access_token = $auth0->get_access_token();

$api_url = "https://example.com/api/protected-endpoint";

$curl = curl_init();
curl_setopt_array($curl, array(
    CURLOPT_RETURNTRANSFER => 1,
    CURLOPT_URL => $api_url,
    CURLOPT_HTTPHEADER => array(
        'Authorization: Bearer ' . $access_token,
        'Content-Type: application/json'
    )
));
$response = curl_exec($curl);
curl_close($curl);

echo $response;

In the above example, we use cURL to make a GET request to access the API endpoint using the obtained access token. Notice that we set the Authorization header in the request header and use the Bearer token type with the access token.

Conclusion

By using OAuth 2.0 and the OpenID Connect protocol, implementing API authentication in PHP is no longer a problem. By following the above steps and code examples correctly, you can ensure that your applications and API endpoints are secure and reliable in terms of authentication.

The above is the detailed content of How to use OpenID Connect for API authentication in PHP. For more information, please follow other related articles on the PHP Chinese website!