Google Auth Library Client - Class ApplicationDefaultCredentials (1.45.2)

Reference documentation and code samples for the Google Auth Library Client class ApplicationDefaultCredentials.

ApplicationDefaultCredentials obtains the default credentials for authorizing a request to a Google service.

Application Default Credentials are described here: https://developers.google.com/accounts/docs/application-default-credentials

This class implements the search for the application default credentials as described in the link.

It provides three factory methods:

#get returns the computed credentials object
#getSubscriber returns an AuthTokenSubscriber built from the credentials object
#getMiddleware returns an AuthTokenMiddleware built from the credentials object

This allows it to be used as follows with GuzzleHttp\Client:

use Google\Auth\ApplicationDefaultCredentials;
use GuzzleHttp\Client;
use GuzzleHttp\HandlerStack;

$middleware = ApplicationDefaultCredentials::getMiddleware(
    'https://www.googleapis.com/auth/taskqueue'
);
$stack = HandlerStack::create();
$stack->push($middleware);

$client = new Client([
    'handler' => $stack,
    'base_uri' => 'https://www.googleapis.com/taskqueue/v1beta2/projects/',
    'auth' => 'google_auth' // authorize all requests
]);

$res = $client->get('myproject/taskqueues/myqueue');

Namespace

Google \ Auth

Methods

static::getSubscriber

Parameters
Name	Description
`scope`	`string\|string[]` the scope of the access request, expressed either as an Array or as a space-delimited String.
`httpHandler`	`callable\|null` callback which delivers psr7 request
`cacheConfig`	`array\|null` configuration for the cache when it's present
`cache`	`Psr\Cache\CacheItemPoolInterface\|null` A cache implementation, may be provided if you have one already available for use.

Returns
Type	Description
`Subscriber\AuthTokenSubscriber`

static::getMiddleware

Obtains an AuthTokenMiddleware that uses 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.

Parameters
Name	Description
`scope`	`string\|string[]` the scope of the access request, expressed either as an Array or as a space-delimited String.
`httpHandler`	`callable\|null` callback which delivers psr7 request
`cacheConfig`	`array\|null` configuration for the cache when it's present
`cache`	`Psr\Cache\CacheItemPoolInterface\|null` A cache implementation, may be provided if you have one already available for use.
`quotaProject`	`string` specifies a project to bill for access charges associated with the request.

Returns
Type	Description
`Middleware\AuthTokenMiddleware`

static::getCredentials

Obtains the default FetchAuthTokenInterface implementation to use in this environment.

Parameters
Name	Description
`scope`	`string\|string[]` the scope of the access request, expressed either as an Array or as a space-delimited String.
`httpHandler`	`callable\|null` callback which delivers psr7 request
`cacheConfig`	`array\|null` configuration for the cache when it's present
`cache`	`Psr\Cache\CacheItemPoolInterface\|null` A cache implementation, may be provided if you have one already available for use.
`quotaProject`	`string\|null` specifies a project to bill for access charges associated with the request.
`defaultScope`	`string\|string[]\|null` The default scope to use if no user-defined scopes exist, expressed either as an Array or as a space-delimited string.
`universeDomain`	`string\|null` Specifies a universe domain to use for the calling client library.
`logger`	`null\|false\|Psr\Log\LoggerInterface` A PSR3 compliant LoggerInterface.

Returns
Type	Description
`FetchAuthTokenInterface`

static::getIdTokenMiddleware

Obtains an AuthTokenMiddleware which will fetch an ID token to use in the Authorization header. The middleware is configured with the default FetchAuthTokenInterface implementation to use in this environment.

If supplied, $targetAudience is used to set the "aud" on the resulting ID token.

Parameters
Name	Description
`targetAudience`	`string` The audience for the ID token.
`httpHandler`	`callable\|null` callback which delivers psr7 request
`cacheConfig`	`array\|null` configuration for the cache when it's present
`cache`	`Psr\Cache\CacheItemPoolInterface\|null` A cache implementation, may be provided if you have one already available for use.

Returns
Type	Description
`Middleware\AuthTokenMiddleware`

static::getProxyIdTokenMiddleware

Obtains an ProxyAuthTokenMiddleware which will fetch an ID token to use in the Authorization header. The middleware is configured with the default FetchAuthTokenInterface implementation to use in this environment.

If supplied, $targetAudience is used to set the "aud" on the resulting ID token.

Parameters
Name	Description
`targetAudience`	`string` The audience for the ID token.
`httpHandler`	`callable\|null` callback which delivers psr7 request
`cacheConfig`	`array\|null` configuration for the cache when it's present
`cache`	`Psr\Cache\CacheItemPoolInterface\|null` A cache implementation, may be provided if you have one already available for use.

Returns
Type	Description
`Middleware\ProxyAuthTokenMiddleware`

static::getIdTokenCredentials

Obtains the default FetchAuthTokenInterface implementation to use in this environment, configured with a $targetAudience for fetching an ID token.

Parameters
Name	Description
`targetAudience`	`string` The audience for the ID token.
`httpHandler`	`callable\|null` callback which delivers psr7 request
`cacheConfig`	`array\|null` configuration for the cache when it's present
`cache`	`Psr\Cache\CacheItemPoolInterface\|null` A cache implementation, may be provided if you have one already available for use.

Returns
Type	Description
`FetchAuthTokenInterface`

static::getDefaultLogger

Returns a StdOutLogger instance

Returns
Type	Description
`null\|Psr\Log\LoggerInterface`