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# Keycloak Provider for OAuth 2.0 Client
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This package provides Keycloak OAuth 2.0 support for the PHP League's [OAuth 2.0 Client](https://github.com/thephpleague/oauth2-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. You can lookup the correct value from the Keycloak client installer JSON under `auth-server-url`, eg. `http://localhost:8080/auth`.
Use `realm` to specify the Keycloak realm name. You can lookup the correct value from the Keycloak client installer JSON under `resource`, eg. `master`.
### Authorization Code Flow
```php
$provider = new Stevenmaguire\OAuth2\Client\Provider\Keycloak([
'authServerUrl' => '{keycloak-server-url}',
'realm' => '{keycloak-realm}',
'clientId' => '{keycloak-client-id}',
'clientSecret' => '{keycloak-client-secret}',
'redirectUri' => 'https://example.com/callback-url',
'encryptionAlgorithm' => 'RS256', // optional
'encryptionKeyPath' => '../key.pem' // optional
'encryptionKey' => 'contents_of_key_or_certificate' // optional
'version' => '20.0.1', // optional
]);
if (!isset($_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 coe 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
```php
$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
```php
$provider = new Stevenmaguire\OAuth2\Client\Provider\Keycloak([
// ...
'encryptionAlgorithm' => 'RS256',
]);
```
or
```php
$provider->setEncryptionAlgorithm('RS256');
```
#### Configure the provider to use the expected decryption public key or certificate
##### By key value
```php
$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,
]);
```
or
```php
$provider->setEncryptionKey($key);
```
##### By key path
```php
$keyPath = '../key.pem';
$provider = new Stevenmaguire\OAuth2\Client\Provider\Keycloak([
// ...
'encryptionKeyPath' => $keyPath,
]);
```
or
```php
$provider->setEncryptionKeyPath($keyPath);
```
## Testing
``` bash
$ ./vendor/bin/phpunit
```
## Contributing
Please see [CONTRIBUTING](https://github.com/stevenmaguire/oauth2-keycloak/blob/master/CONTRIBUTING.md) for details.
## Credits
- [Steven Maguire](https://github.com/stevenmaguire)
- [Martin Stefan](https://github.com/mstefan21)
- [All Contributors](https://github.com/stevenmaguire/oauth2-keycloak/contributors)
## License
The MIT License (MIT). Please see [License File](https://github.com/stevenmaguire/oauth2-keycloak/blob/master/LICENSE) for more information.

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