Keycloak Provider for OAuth 2.0 Client

This package provides Keycloak OAuth 2.0 support for the PHP League's OAuth 2.0 Client.

Installation

To install, use composer:

composer require stevenmaguire/oauth2-keycloak

Usage

Usage is the same as The League's OAuth client, using \Stevenmaguire\OAuth2\Client\Provider\Keycloak as the provider.

Use authServerUrl to specify the Keycloak server URL. This depends on your Keycloak version:

legacy releases often use http://localhost:8080/auth
modern releases (Keycloak 17+) typically use http://localhost:8080

Use realm to specify the Keycloak realm name. In client configuration exports this is represented as realm, e.g. master.

Authorization Code Flow

$provider = new Stevenmaguire\OAuth2\Client\Provider\Keycloak([
    'authServerUrl'         => '{keycloak-server-url}',
    'realm'                 => '{keycloak-realm}',
    'clientId'              => '{keycloak-client-id}',
    'clientSecret'          => '{keycloak-client-secret}',
    'redirectUri'           => 'https://example.com/callback-url',
    'encryptionAlgorithm'   => 'RS256',                             // optional
    'encryptionKeyPath'     => '../key.pem',                        // optional
    'encryptionKey'         => 'contents_of_key_or_certificate',    // optional
    'version'               => '20.0.1',                            // optional
]);

if (!isset($_GET['code'])) {

    // If we don't have an authorization code then get one
    $authUrl = $provider->getAuthorizationUrl();
    $_SESSION['oauth2state'] = $provider->getState();
    header('Location: '.$authUrl);
    exit;

// Check given state against previously stored one to mitigate CSRF attack
} elseif (empty($_GET['state']) || ($_GET['state'] !== $_SESSION['oauth2state'])) {

    unset($_SESSION['oauth2state']);
    exit('Invalid state, make sure HTTP sessions are enabled.');

} else {

    // Try to get an access token (using the authorization code grant)
    try {
        $token = $provider->getAccessToken('authorization_code', [
            'code' => $_GET['code']
        ]);
    } catch (Exception $e) {
        exit('Failed to get access token: '.$e->getMessage());
    }

    // Optional: Now you have a token you can look up a users profile data
    try {

        // We got an access token, let's now get the user's details
        $user = $provider->getResourceOwner($token);

        // Use these details to create a new profile
        printf('Hello %s!', $user->getName());

    } catch (Exception $e) {
        exit('Failed to get resource owner: '.$e->getMessage());
    }

    // Use this to interact with an API on the users behalf
    echo $token->getToken();
}

Refreshing a Token

$provider = new Stevenmaguire\OAuth2\Client\Provider\Keycloak([
    'authServerUrl'     => '{keycloak-server-url}',
    'realm'             => '{keycloak-realm}',
    'clientId'          => '{keycloak-client-id}',
    'clientSecret'      => '{keycloak-client-secret}',
    'redirectUri'       => 'https://example.com/callback-url',
]);

$token = $provider->getAccessToken('refresh_token', ['refresh_token' => $token->getRefreshToken()]);

Handling encryption

If you've configured your Keycloak instance to use encryption, there are some advanced options available to you.

Configure the provider to use the same encryption algorithm

$provider = new Stevenmaguire\OAuth2\Client\Provider\Keycloak([
    // ...
    'encryptionAlgorithm'   => 'RS256',
]);

$provider->setEncryptionAlgorithm('RS256');

Configure the provider to use the expected decryption public key or certificate

By key value

$key = "-----BEGIN PUBLIC KEY-----\n....\n-----END PUBLIC KEY-----";
// or
// $key = "-----BEGIN CERTIFICATE-----\n....\n-----END CERTIFICATE-----";

$provider = new Stevenmaguire\OAuth2\Client\Provider\Keycloak([
    // ...
    'encryptionKey'   => $key,
]);

$provider->setEncryptionKey($key);

By key path

$keyPath = '../key.pem';

$provider = new Stevenmaguire\OAuth2\Client\Provider\Keycloak([
    // ...
    'encryptionKeyPath'   => $keyPath,
]);

$provider->setEncryptionKeyPath($keyPath);

Testing

$ composer test

Oauth2 Keycloak Laravel Package