/**
* 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 callable $httpHandler callback which delivers psr7 request
* @param array $cacheConfig configuration for the cache when it's present
* @param CacheItemPoolInterface $cache
*
* @return CredentialsLoader
*
* @throws DomainException if no implementation can be obtained.
*/
public static function getCredentials($scope = null, callable $httpHandler = null, array $cacheConfig = null, CacheItemPoolInterface $cache = null)
{
$creds = null;
$jsonKey = CredentialsLoader::fromEnv() ?: CredentialsLoader::fromWellKnownFile();
if (!is_null($jsonKey)) {
$creds = CredentialsLoader::makeCredentials($scope, $jsonKey);
}
if (AppIdentityCredentials::onAppEngine() && !GCECredentials::onAppEngineFlexible()) {
$creds = new AppIdentityCredentials($scope);
}
if (GCECredentials::onGce($httpHandler)) {
$creds = new GCECredentials();
}
if (is_null($creds)) {
throw new \DomainException(self::notFound());
}
if (!is_null($cache)) {
$creds = new FetchAuthTokenCache($creds, $cacheConfig, $cache);
}
return $creds;
}
public function testIsTrueWhenGaeVmIsTrue()
{
$_SERVER['GAE_VM'] = 'true';
$this->assertTrue(GCECredentials::onAppEngineFlexible());
}
