/**
* Obtains the default FetchAuthTokenInterface implementation to use
* in this environment.
*
* If supplied, $scope is used to in creating the credentials instance if
* this does not fallback to the Compute Engine defaults.
*
* @param string|array scope the scope of the access request, expressed
* either as an Array or as a space-delimited String.
*
* @param $client GuzzleHttp\ClientInterface optional client.
* @throws DomainException if no implementation can be obtained.
*/
public static function getCredentials($scope = null, $client = null)
{
$creds = CredentialsLoader::fromEnv($scope);
if (!is_null($creds)) {
return $creds;
}
$creds = CredentialsLoader::fromWellKnownFile($scope);
if (!is_null($creds)) {
return $creds;
}
if (AppIdentityCredentials::onAppEngine()) {
return new AppIdentityCredentials($scope);
}
if (GCECredentials::onGce($client)) {
return new GCECredentials();
}
throw new \DomainException(self::notFound());
}
public function testIsTrueWhenServerSoftwareIsGoogleAppEngine()
{
$_SERVER['SERVER_SOFTWARE'] = 'Google App Engine';
$this->assertTrue(AppIdentityCredentials::onAppEngine());
}
