org.apache.hadoop.fs.adl.oauth2

Class AzureADTokenProvider

java.lang.Object

org.apache.hadoop.fs.adl.oauth2.AzureADTokenProvider

@InterfaceAudience.Public
 @InterfaceStability.Evolving
public abstract class AzureADTokenProvider
extends Object

Provide an Azure Active Directory supported OAuth2 access token to be used to authenticate REST calls against Azure data lake file system AdlFileSystem.

Constructor Summary

Constructors

Constructor and Description
AzureADTokenProvider()

Method Summary

Modifier and Type	Method and Description
abstract String	getAccessToken() Obtain the access token that should be added to https connection's header.
abstract Date	getExpiryTime() Obtain expiry time of the token.
abstract void	initialize(Configuration configuration) Initialize with supported configuration.

Methods inherited from class java.lang.Object

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

Constructor Detail

AzureADTokenProvider

public AzureADTokenProvider()

Method Detail

initialize

public abstract void initialize(Configuration configuration)
                         throws IOException

Initialize with supported configuration. This method is invoked when the (URI, Configuration) method is invoked.

Parameters:

configuration - Configuration object

Throws:

IOException - if instance can not be configured.

getAccessToken

public abstract String getAccessToken()
                               throws IOException

Obtain the access token that should be added to https connection's header. Will be called depending upon getExpiryTime() expiry time is set, so implementations should be performant. Implementations are responsible for any refreshing of the token.

Returns:

String containing the access token

Throws:

IOException - if there is an error fetching the token

getExpiryTime

public abstract Date getExpiryTime()

Obtain expiry time of the token. If implementation is performant enough to maintain expiry and expect getAccessToken() call for every connection then safe to return current or past time. However recommended to use the token expiry time received from Azure Active Directory.

Returns:

Date to expire access token retrieved from AAD.