class GCECredentials extends CredentialsLoader implements SignBlobInterface, ProjectIdProviderInterface, GetQuotaProjectInterface (View source)

GCECredentials supports authorization on Google Compute Engine.

It can be used to authorize requests using the AuthTokenMiddleware, but will only succeed if being run on GCE:

use Google\Auth\Credentials\GCECredentials; use Google\Auth\Middleware\AuthTokenMiddleware; use GuzzleHttp\Client; use GuzzleHttp\HandlerStack;

$gce = new GCECredentials(); $middleware = new AuthTokenMiddleware($gce); $stack = HandlerStack::create(); $stack->push($middleware);

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

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

Constants

TOKEN_CREDENTIAL_URI

ENV_VAR

WELL_KNOWN_PATH

NON_WINDOWS_WELL_KNOWN_PATH_BASE

cacheKey

METADATA_IP

The metadata IP address on appengine instances.

The IP is used instead of the domain 'metadata' to avoid slow responses when not on Compute Engine.

TOKEN_URI_PATH

The metadata path of the default token.

ID_TOKEN_URI_PATH

The metadata path of the default id token.

CLIENT_ID_URI_PATH

The metadata path of the client ID.

PROJECT_ID_URI_PATH

The metadata path of the project ID.

FLAVOR_HEADER

The header whose presence indicates GCE presence.

MAX_COMPUTE_PING_TRIES

Note: the explicit timeout and tries below is a workaround. The underlying issue is that resolving an unknown host on some networks will take 20-30 seconds; making this timeout short fixes the issue, but could lead to false negatives in the event that we are on GCE, but the metadata resolution was particularly slow. The latter case is "unlikely" since the expected 4-nines time is about 0.5 seconds.

This allows us to limit the total ping maximum timeout to 1.5 seconds for developer desktop scenarios.

COMPUTE_PING_CONNECTION_TIMEOUT_S

Properties

protected $lastReceivedToken Result of fetchAuthToken.

Methods

static array|null
fromEnv()

Load a JSON key from the path specified in the environment.

static array|null
fromWellKnownFile()

Load a JSON key from a well known path.

makeCredentials(string|array $scope, array $jsonKey, string|array $defaultScope = null)

Create a new Credentials instance.

static Client
makeHttpClient(FetchAuthTokenInterface $fetcher, array $httpClientOptions = [], callable $httpHandler = null, callable $tokenCallback = null)

Create an authorized HTTP Client from an instance of FetchAuthTokenInterface.

makeInsecureCredentials()

Create a new instance of InsecureCredentials.

array
getUpdateMetadataFunc() deprecated

export a callback function which updates runtime metadata.

array
updateMetadata(array $metadata, string $authUri = null, callable $httpHandler = null)

Updates metadata with the authorization token.

__construct(Iam $iam = null, string|array $scope = null, string $targetAudience = null, string $quotaProject = null, string $serviceAccountIdentity = null)

No description

static string
getTokenUri(string $serviceAccountIdentity = null)

The full uri for accessing the default token.

static string
getClientNameUri(string $serviceAccountIdentity = null)

The full uri for accessing the default service account.

static bool
onAppEngineFlexible()

Determines if this an App Engine Flexible instance, by accessing the GAE_INSTANCE environment variable.

static bool
onGce(callable $httpHandler = null)

Determines if this a GCE instance, by accessing the expected metadata host.

array
fetchAuthToken(callable $httpHandler = null)

Implements FetchAuthTokenInterface#fetchAuthToken.

string
getCacheKey()

No description

null|array
getLastReceivedToken()

No description

string
getClientName(callable $httpHandler = null)

Get the client name from GCE metadata.

string
signBlob(string $stringToSign, bool $forceOpenSsl = false, string $accessToken = null)

Sign a string using the default service account private key.

string|null
getProjectId(callable $httpHandler = null)

Fetch the default Project ID from compute engine.

string|null
getQuotaProject()

Get the quota project used for this API request

Details

static array|null fromEnv()

Load a JSON key from the path specified in the environment.

Load a JSON key from the path specified in the environment variable GOOGLE_APPLICATION_CREDENTIALS. Return null if GOOGLE_APPLICATION_CREDENTIALS is not specified.

Return Value

array|null JSON key | null

static array|null fromWellKnownFile()

Load a JSON key from a well known path.

The well known path is OS dependent:

  • windows: %APPDATA%/gcloud/application_default_credentials.json
  • others: $HOME/.config/gcloud/application_default_credentials.json

If the file does not exist, this returns null.

Return Value

array|null JSON key | null

static ServiceAccountCredentials|UserRefreshCredentials makeCredentials(string|array $scope, array $jsonKey, string|array $defaultScope = null)

Create a new Credentials instance.

Parameters

string|array $scope the scope of the access request, expressed either as an Array or as a space-delimited String.
array $jsonKey the JSON credentials.
string|array $defaultScope The default scope to use if no user-defined scopes exist, expressed either as an Array or as a space-delimited string.

Return Value

ServiceAccountCredentials|UserRefreshCredentials

static Client makeHttpClient(FetchAuthTokenInterface $fetcher, array $httpClientOptions = [], callable $httpHandler = null, callable $tokenCallback = null)

Create an authorized HTTP Client from an instance of FetchAuthTokenInterface.

Parameters

FetchAuthTokenInterface $fetcher is used to fetch the auth token
array $httpClientOptions (optional) Array of request options to apply.
callable $httpHandler (optional) http client to fetch the token.
callable $tokenCallback (optional) function to be called when a new token is fetched.

Return Value

Client

static InsecureCredentials makeInsecureCredentials()

Create a new instance of InsecureCredentials.

Return Value

InsecureCredentials

array getUpdateMetadataFunc() deprecated

deprecated

export a callback function which updates runtime metadata.

Return Value

array updateMetadata function

array updateMetadata(array $metadata, string $authUri = null, callable $httpHandler = null)

Updates metadata with the authorization token.

Parameters

array $metadata metadata hashmap
string $authUri optional auth uri
callable $httpHandler callback which delivers psr7 request

Return Value

array updated metadata hashmap

__construct(Iam $iam = null, string|array $scope = null, string $targetAudience = null, string $quotaProject = null, string $serviceAccountIdentity = null)

Parameters

Iam $iam [optional] An IAM instance.
string|array $scope [optional] the scope of the access request, expressed either as an array or as a space-delimited string.
string $targetAudience [optional] The audience for the ID token.
string $quotaProject [optional] Specifies a project to bill for access charges associated with the request.
string $serviceAccountIdentity [optional] Specify a service account identity name to use instead of "default".

static string getTokenUri(string $serviceAccountIdentity = null)

The full uri for accessing the default token.

Parameters

string $serviceAccountIdentity [optional] Specify a service account identity name to use instead of "default".

Return Value

string

static string getClientNameUri(string $serviceAccountIdentity = null)

The full uri for accessing the default service account.

Parameters

string $serviceAccountIdentity [optional] Specify a service account identity name to use instead of "default".

Return Value

string

static bool onAppEngineFlexible()

Determines if this an App Engine Flexible instance, by accessing the GAE_INSTANCE environment variable.

Return Value

bool true if this an App Engine Flexible Instance, false otherwise

static bool onGce(callable $httpHandler = null)

Determines if this a GCE instance, by accessing the expected metadata host.

If $httpHandler is not specified a the default HttpHandler is used.

Parameters

callable $httpHandler callback which delivers psr7 request

Return Value

bool True if this a GCEInstance, false otherwise

array fetchAuthToken(callable $httpHandler = null)

Implements FetchAuthTokenInterface#fetchAuthToken.

Fetches the auth tokens from the GCE metadata host if it is available. If $httpHandler is not specified a the default HttpHandler is used.

Parameters

callable $httpHandler callback which delivers psr7 request

Return Value

array a hash of auth tokens

Exceptions

Exception

string getCacheKey()

Return Value

string a key that may be used to cache the auth token.

null|array getLastReceivedToken()

Return Value

null|array { The last received access token.

string getClientName(callable $httpHandler = null)

Get the client name from GCE metadata.

Subsequent calls will return a cached value.

Parameters

callable $httpHandler callback which delivers psr7 request, if one is required to obtain a client name.

Return Value

string

string signBlob(string $stringToSign, bool $forceOpenSsl = false, string $accessToken = null)

Sign a string using the default service account private key.

This implementation uses IAM's signBlob API.

Parameters

string $stringToSign The string to sign.
bool $forceOpenSsl Require use of OpenSSL for local signing. Does not apply to signing done using external services. Defaults to false.
string $accessToken The access token to use to sign the blob. If provided, saves a call to the metadata server for a new access token. Defaults to null.

Return Value

string The resulting signature. Value should be base64-encoded.

See also

https://cloud.google.com/iam/credentials/reference/rest/v1/projects.serviceAccounts/signBlob SignBlob

string|null getProjectId(callable $httpHandler = null)

Fetch the default Project ID from compute engine.

Returns null if called outside GCE.

Parameters

callable $httpHandler Callback which delivers psr7 request

Return Value

string|null

string|null getQuotaProject()

Get the quota project used for this API request

Return Value

string|null