com.google.auth

Class Credentials

java.lang.Object

com.google.auth.Credentials

public abstract class Credentials
extends Object

Represents an abstract authorized identity instance.

Constructor Summary

Constructors

Constructor and Description
Credentials()

Method Summary

Methods

Modifier and Type	Method and Description
abstract String	getAuthenticationType() A constant string name describing the authentication technology.
abstract Map<String,List<String>>	getRequestMetadata() Get the current request metadata, refreshing tokens if required.
abstract boolean	hasRequestMetadata() Whether the credentials have metadata entries that should be added to each request.
abstract boolean	hasRequestMetadataOnly() Indicates whether or not the Auth mechanism works purely by including request metadata.
abstract void	refresh() Refresh the authorization data, discarding any cached state.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Credentials

public Credentials()

Method Detail

getAuthenticationType

public abstract String getAuthenticationType()

A constant string name describing the authentication technology.

E.g. “OAuth2”, “SSL”. For use by the transport layer to determine whether it supports the type of authentication in the case where hasRequestMetadataOnly() is false. Also serves as a debugging helper.

getRequestMetadata

public abstract Map<String,List<String>> getRequestMetadata()
                                                     throws IOException

Get the current request metadata, refreshing tokens if required.

This should be called by the transport layer on each request, and the data should be populated in headers or other context. The operation can block and fail to complete and may do things such as refreshing access tokens.

Throws:

IOException - if there was an error getting up-to-date access.

hasRequestMetadata

public abstract boolean hasRequestMetadata()

Whether the credentials have metadata entries that should be added to each request.

This should be called by the transport layer to see if getRequestMetadata() should be used for each request.

hasRequestMetadataOnly

public abstract boolean hasRequestMetadataOnly()

Indicates whether or not the Auth mechanism works purely by including request metadata.

This is meant for the transport layer. If this is true a transport does not need to take actions other than including the request metadata. If this is false, a transport must specifically know about the authentication technology to support it, and should fail to accept the credentials otherwise.

refresh

public abstract void refresh()
                      throws IOException

Refresh the authorization data, discarding any cached state.

For use by the transport to allow retry after getting an error indicating there may be invalid tokens or other cached state.

Throws:

IOException - if there was an error getting up-to-date access.