google.auth.compute_engine.credentials module

Google Compute Engine credentials.

This module provides authentication for application running on Google Compute Engine using the Compute Engine metadata server.

class Credentials(service_account_email='default')[source]

Bases: google.auth.credentials.ReadOnlyScoped, google.auth.credentials.Credentials

Compute Engine Credentials.

These credentials use the Google Compute Engine metadata server to obtain OAuth 2.0 access tokens associated with the instance’s service account.

For more information about Compute Engine authentication, including how to configure scopes, see the Compute Engine authentication documentation.

Note

Compute Engine instances can be created with scopes and therefore these credentials are considered to be ‘scoped’. However, you can not use with_scopes() because it is not possible to change the scopes that the instance has. Also note that has_scopes() will not work until the credentials have been refreshed.

Parameters

service_account_email (str) – The service account email to use, or ‘default’. A Compute Engine instance may have multiple service accounts.

refresh(request)[source]

Refresh the access token and scopes.

Parameters

request (google.auth.transport.Request) – The object used to make HTTP requests.

Raises

google.auth.exceptions.RefreshError – If the Compute Engine metadata service can’t be reached if if the instance has not credentials.

property service_account_email

The service account email.

Note

This is not guaranteed to be set until refresh() has been called.

property requires_scopes

Compute Engine credentials can not be scoped.

Type

False

apply(headers, token=None)[source]

Apply the token to the authentication header.

Parameters

  • headers (Mapping) – The HTTP request headers.

  • token (Optional [ str ]) – If specified, overrides the current access token.

before_request(request, method, url, headers)[source]

Performs credential-specific before request logic.

Refreshes the credentials if necessary, then calls apply() to apply the token to the authentication header.

Parameters

  • request (google.auth.transport.Request) – The object used to make HTTP requests.

  • method (str) – The request’s HTTP method or the RPC method being invoked.

  • url (str) – The request’s URI or the RPC service’s URI.

  • headers (Mapping) – The request’s headers.

property expired

Checks if the credentials are expired.

Note that credentials can be invalid but not expired because Credentials with expiry set to None is considered to never expire.

has_scopes(scopes)

Checks if the credentials have the given scopes.

Parameters

scopes (Sequence [ str ]) – The list of scopes to check.

Returns

True if the credentials have the given scopes.

Return type

bool

property scopes

the credentials’ current set of scopes.

Type

Sequence [ str ]

property valid

Checks the validity of the credentials.

This is True if the credentials have a token and the token is not expired.

class IDTokenCredentials(request, target_audience, token_uri=None, additional_claims=None, service_account_email=None, signer=None, use_metadata_identity_endpoint=False)[source]

Bases: google.auth.credentials.Credentials, google.auth.credentials.Signing

Open ID Connect ID Token-based service account credentials.

These credentials relies on the default service account of a GCE instance.

ID token can be requested from GCE metadata server identity endpoint, IAM token endpoint or other token endpoints you specify. If metadata server identity endpoint is not used, the GCE instance must have been started with a service account that has access to the IAM Cloud API.

Parameters

  • request (google.auth.transport.Request) – The object used to make HTTP requests.

  • target_audience (str) – The intended audience for these credentials, used when requesting the ID Token. The ID Token’s aud claim will be set to this string.

  • token_uri (str) – The OAuth 2.0 Token URI.

  • additional_claims (Mapping [ str, str ]) – Any additional claims for the JWT assertion used in the authorization grant.

  • service_account_email (str) – Optional explicit service account to use to sign JWT tokens. By default, this is the default GCE service account.

  • signer (google.auth.crypt.Signer) – The signer used to sign JWTs. In case the signer is specified, the request argument will be ignored.

  • use_metadata_identity_endpoint (bool) – Whether to use GCE metadata identity endpoint. For backward compatibility the default value is False. If set to True, token_uri, additional_claims, service_account_email, signer argument should not be set; otherwise ValueError will be raised.

Raises

ValueError – If use_metadata_identity_endpoint is set to True, and one of token_uri, additional_claims, service_account_email, signer arguments is set.

with_target_audience(target_audience)[source]

Create a copy of these credentials with the specified target audience. :param target_audience: The intended audience for these credentials, :type target_audience: str :param used when requesting the ID Token.:

Returns

A new credentials

instance.

Return type

google.auth.service_account.IDTokenCredentials

apply(headers, token=None)

Apply the token to the authentication header.

Parameters

  • headers (Mapping) – The HTTP request headers.

  • token (Optional [ str ]) – If specified, overrides the current access token.

before_request(request, method, url, headers)

Performs credential-specific before request logic.

Refreshes the credentials if necessary, then calls apply() to apply the token to the authentication header.

Parameters

  • request (google.auth.transport.Request) – The object used to make HTTP requests.

  • method (str) – The request’s HTTP method or the RPC method being invoked.

  • url (str) – The request’s URI or the RPC service’s URI.

  • headers (Mapping) – The request’s headers.

property expired

Checks if the credentials are expired.

Note that credentials can be invalid but not expired because Credentials with expiry set to None is considered to never expire.

refresh(request)[source]

Refreshes the ID token.

Parameters

request (google.auth.transport.Request) – The object used to make HTTP requests.

Raises
property valid

Checks the validity of the credentials.

This is True if the credentials have a token and the token is not expired.

property signer

The signer used to sign bytes.

Type

google.auth.crypt.Signer

sign_bytes(message)[source]

Signs the given message.

Parameters

message (bytes) – The message to sign.

Returns

The message’s cryptographic signature.

Return type

bytes

Raises

ValueError – Signer is not available if metadata identity endpoint is used.

property service_account_email

The service account email.

property signer_email

An email address that identifies the signer.

Type

Optional [ str ]