google.auth.app_engine module

Google App Engine standard environment support.

This module provides authentication and signing for applications running on App Engine in the standard environment using the App Identity API.

class Signer[source]

Bases: google.auth.crypt.base.Signer

Signs messages using the App Engine App Identity service.

This can be used in place of google.auth.crypt.Signer when running in the App Engine standard environment.


The key ID used to identify this private key.


This is always None. The key ID used by App Engine can not be reliably determined ahead of time.

Type:Optional [ str ]

Signs a message.

Parameters:message (Union [ str, bytes ]) – The message to be signed.
Returns:The signature of the message.
Return type:bytes

Gets the project ID for the current App Engine application.

Returns:The project ID
Return type:str
Raises:EnvironmentError – If the App Engine APIs are unavailable.
class Credentials(scopes=None, default_scopes=None, service_account_id=None, quota_project_id=None)[source]

Bases: google.auth.credentials.Scoped, google.auth.credentials.Signing, google.auth.credentials.CredentialsWithQuotaProject

App Engine standard environment credentials.

These credentials use the App Engine App Identity API to obtain access tokens.

  • scopes (Sequence [ str ]) – Scopes to request from the App Identity API.
  • default_scopes (Sequence [ str ]) – Default scopes passed by a Google client library. Use ‘scopes’ for user-defined scopes.
  • service_account_id (str) – The service account ID passed into google.appengine.api.app_identity.get_access_token(). If not specified, the default application service account ID will be used.
  • quota_project_id (Optional [ str ]) – The project ID used for quota and billing.

EnvironmentError – If the App Engine APIs are unavailable.


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.

The service account email.


Checks if the credentials requires scopes.

Returns:True if there are no scopes set otherwise False.
Return type:bool
with_scopes(scopes, default_scopes=None)[source]

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.

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

Signs the given message.

Parameters:message (bytes) – The message to sign.
Returns:The message’s cryptographic signature.
Return type:bytes

An email address that identifies the signer.

Type:Optional [ str ]

The signer used to sign bytes.

apply(headers, token=None)[source]

Apply the token to the authentication header.

  • 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.

  • 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.

the credentials’ current set of default scopes.

Type:Sequence [ str ]

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.


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 to use for quota and billing purposes.


the credentials’ current set of scopes.

Type:Sequence [ str ]

Checks the validity of the credentials.

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