google.auth.identity_pool module

Identity Pool Credentials.

This module provides credentials to access Google Cloud resources from on-prem or non-Google Cloud platforms which support external credentials (e.g. OIDC ID tokens) retrieved from local file locations or local servers. This includes Microsoft Azure and OIDC identity providers (e.g. K8s workloads registered with Hub with Hub workload identity enabled).

These credentials are recommended over the use of service account credentials in on-prem/non-Google Cloud platforms as they do not involve the management of long-live service account private keys.

Identity Pool Credentials are initialized using external_account arguments which are typically loaded from an external credentials file or an external credentials URL. Unlike other Credentials that can be initialized with a list of explicit arguments, secrets or credentials, external account clients use the environment and hints/guidelines provided by the external_account JSON file to retrieve credentials and exchange them for Google access tokens.

class Credentials(audience, subject_token_type, token_url, credential_source, service_account_impersonation_url=None, client_id=None, client_secret=None, quota_project_id=None, scopes=None, default_scopes=None)

Bases: google.auth.external_account.Credentials

External account credentials sourced from files and URLs.

Instantiates an external account credentials object from a file/URL.

Parameters:

• audience (str) – The STS audience field.
• subject_token_type (str) – The subject token type.
• token_url (str) – The STS endpoint URL.
• credential_source (Mapping) –

  The credential source dictionary used to provide instructions on how to retrieve external credential to be exchanged for Google access tokens.

  Example credential_source for url-sourced credential:

  {
      "url": "http://www.example.com",
      "format": {
          "type": "json",
          "subject_token_field_name": "access_token",
      },
      "headers": {"foo": "bar"},
  }
  

  Example credential_source for file-sourced credential:

  {
      "file": "/path/to/token/file.txt"
  }
  

• service_account_impersonation_url (Optional [ str ]) – The optional service account impersonation getAccessToken URL.
• client_id (Optional [ str ]) – The optional client ID.
• client_secret (Optional [ str ]) – The optional client secret.
• quota_project_id (Optional [ str ]) – The optional quota project ID.
• scopes (Optional [ Sequence [ str ] ]) – Optional scopes to request during the authorization grant.
• default_scopes (Optional [ Sequence [ str ] ]) – Default scopes passed by a Google client library. Use ‘scopes’ for user-defined scopes.

Raises:

• google.auth.exceptions.RefreshError – If an error is encountered during access token retrieval logic.
• ValueError – For invalid parameters.

Note

Typically one of the helper constructors from_file() or from_info() are used instead of calling the constructor directly.

retrieve_subject_token(request)

Retrieves the subject token using the credential_source object.

Parameters:request (google.auth.transport.Request) – A callable used to make HTTP requests. Returns:The retrieved subject token. Return type:str

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.

default_scopes

the credentials’ current set of default scopes.

Type:Sequence [ str ]

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.

get_project_id(request)

Retrieves the project ID corresponding to the workload identity pool.

When not determinable, None is returned.

This is introduced to support the current pattern of using the Auth library:

credentials, project_id = google.auth.default()

The resource may not have permission (resourcemanager.projects.get) to call this API or the required scopes may not be selected: https://cloud.google.com/resource-manager/reference/rest/v1/projects/get#authorization-scopes

Parameters:request (google.auth.transport.Request) – A callable used to make HTTP requests. Returns:

The project ID corresponding to the workload identity pool

if determinable.

Return type:Optional [ str ]

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

project_number

The project number corresponding to the workload identity pool.

Type:Optional [ str ]

quota_project_id

Project to use for quota and billing purposes.

refresh(request)

Refreshes the access token.

Parameters:request (google.auth.transport.Request) – The object used to make HTTP requests. Raises:google.auth.exceptions.RefreshError – If the credentials could not be refreshed.

requires_scopes

Checks if the credentials requires scopes.

Returns:True if there are no scopes set otherwise False. Return type:bool

scopes

the credentials’ current set of scopes.

Type:Sequence [ str ]

valid

Checks the validity of the credentials.

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

with_quota_project(quota_project_id)

Returns a copy of these credentials with a modified quota project.

Parameters:quota_project_id (str) – The project to use for quota and billing purposes Returns:A new credentials instance. Return type:google.oauth2.credentials.Credentials

with_scopes(scopes, default_scopes=None)

Create a copy of these credentials with the specified scopes.

Parameters:scopes (Sequence [ str ]) – The list of scopes to attach to the current credentials. Raises:NotImplementedError – If the credentials’ scopes can not be changed. This can be avoided by checking requires_scopes before calling this method.

classmethod from_info(info, **kwargs)

Creates an Identity Pool Credentials instance from parsed external account info.

Parameters:

• info (Mapping [ str, str ]) – The Identity Pool external account info in Google format.
• kwargs – Additional arguments to pass to the constructor.

Returns:

The constructed

credentials.

Return type:

google.auth.identity_pool.Credentials

Raises:

ValueError – For invalid parameters.

classmethod from_file(filename, **kwargs)

Creates an IdentityPool Credentials instance from an external account json file.

Parameters:

• filename (str) – The path to the IdentityPool external account json file.
• kwargs – Additional arguments to pass to the constructor.

Returns:

The constructed

credentials.

Return type:

google.auth.identity_pool.Credentials