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Provider.php
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Provider.php
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<?php
namespace SocialiteProviders\AzureADB2C;
use Exception;
use Firebase\JWT\JWK;
use Firebase\JWT\JWT;
use Illuminate\Support\Arr;
use Illuminate\Support\Facades\URL;
use Illuminate\Support\Str;
use Laravel\Socialite\Two\InvalidStateException;
use SocialiteProviders\Manager\OAuth2\AbstractProvider;
use SocialiteProviders\Manager\OAuth2\User;
class Provider extends AbstractProvider
{
public const IDENTIFIER = 'AZUREADB2C';
/**
* {@inheritdoc}
*/
protected $scopes = [
'openid',
];
protected $scopeSeparator = ' ';
/**
* Get the policy.
*
* @return string
*/
private function getPolicy()
{
return $this->parameters['policy'] ?? 'login';
}
/**
* Get the B2C policy.
*
* @return mixed
*/
private function getB2CPolicy()
{
$policy = $this->getConfig('policy');
if (is_array($policy)) {
$policyKey = $this->getPolicy();
$policy = $policy[$policyKey] ?? reset($policy);
}
return $policy;
}
/**
* Set the redirect URL.
*
* @return void
*/
private function setRedirectUrl()
{
$redirectTemplate = $this->getConfig('redirect_template');
if (empty($redirectTemplate)) {
return;
}
$redirect = str_replace('{policy}', $this->getPolicy(), $redirectTemplate);
$url = Str::startsWith($redirect, '/')
? URL::to($redirect)
: $redirect;
$this->redirectUrl($url);
}
/**
* Get OpenID Configuration.
*
* @return mixed
*
* @throws Laravel\Socialite\Two\InvalidStateException
*/
private function getOpenIdConfiguration()
{
$this->setRedirectUrl();
try {
$discovery = sprintf(
'https://%s/%s/%s/v2.0/.well-known/openid-configuration',
$this->getConfig('custom_domain', $this->getConfig('domain').'.b2clogin.com'),
$this->getConfig('tenant', $this->getConfig('domain').'.onmicrosoft.com'),
$this->getB2CPolicy()
);
$response = $this->getHttpClient()->get($discovery);
} catch (Exception $ex) {
throw new InvalidStateException("Error on getting OpenID Configuration. {$ex}");
}
return json_decode((string) $response->getBody());
}
/**
* Get public keys to verify id_token from jwks_uri.
*
* @return array
*/
private function getJWTKeys()
{
$response = $this->getHttpClient()->get($this->getOpenIdConfiguration()->jwks_uri);
return json_decode((string) $response->getBody(), true);
}
/**
* {@inheritdoc}
*/
protected function getAuthUrl($state)
{
return $this->buildAuthUrlFromBase(
$this->getOpenIdConfiguration()->authorization_endpoint,
$state
);
}
/**
* {@inheritdoc}
*/
protected function getTokenUrl()
{
return $this->getOpenIdConfiguration()->token_endpoint;
}
/**
* {@inheritdoc}
*/
protected function getUserByToken($token)
{
// no implementation required because Azure AD B2C doesn't return access_token
}
/**
* Additional implementation to get user claims from id_token.
*
* @return \SocialiteProviders\Manager\OAuth2\User
*/
public function user()
{
$this->setRedirectUrl();
$response = $this->getAccessTokenResponse($this->getCode());
$claims = $this->validateIdToken(Arr::get($response, 'id_token'));
return $this->mapUserToObject($claims);
}
/**
* validate id_token
* - signature validation using firebase/jwt library.
* - claims validation
* iss: MUST much iss = issuer value on metadata.
* aud: MUST include client_id for this client.
* exp: MUST time() < exp.
*
* @param string $idToken
* @return array
*
* @throws Laravel\Socialite\Two\InvalidStateException
*/
private function validateIdToken($idToken)
{
try {
// payload validation
$payload = explode('.', $idToken);
$payloadJson = json_decode(base64_decode(str_pad(strtr($payload[1], '-_', '+/'), strlen($payload[1]) % 4, '=')), true);
// iss validation
if (strcmp($payloadJson['iss'], $this->getOpenIdConfiguration()->issuer)) {
throw new InvalidStateException('iss on id_token does not match issuer value on the OpenID configuration');
}
// aud validation
if (! str_contains($payloadJson['aud'], $this->config['client_id'])) {
throw new InvalidStateException('aud on id_token does not match the client_id for this application');
}
// exp validation
if ((int) $payloadJson['exp'] < time()) {
throw new InvalidStateException('id_token is expired');
}
// signature validation and return claims
return (array) JWT::decode($idToken, JWK::parseKeySet($this->getJWTKeys(), $this->getConfig('default_algorithm')));
} catch (Exception $ex) {
throw new InvalidStateException("Error on validating id_token. {$ex}");
}
}
/**
* {@inheritdoc}
*/
protected function mapUserToObject(array $user)
{
return (new User())->setRaw($user)->map([
'id' => $user['sub'],
'nickname' => $user['name'],
'name' => $user['name'],
'email' => $user['emails'][0] ?? $user['email'],
]);
}
/**
* return logout endpoint with post_logout_uri paramter.
*
* @return string
*/
public function logout($post_logout_uri)
{
return $this->getOpenIdConfiguration()->end_session_endpoint
.'?logout&post_logout_redirect_uri='
.urlencode($post_logout_uri);
}
/**
* @return array
*/
public static function additionalConfigKeys()
{
return [
'domain',
'policy',
'redirect_template',
'default_algorithm',
'custom_domain',
'tenant',
];
}
}