ImpersonationAuthenticator (Alluxio Core - Common Utilities 294 API)

java.lang.Object
- alluxio.security.authentication.ImpersonationAuthenticator

```
@ThreadSafe
public final class ImpersonationAuthenticator
extends java.lang.Object
```
An authenticator for impersonation users. This determines if a connection user (the user making the connection) is configured to impersonate as a separate impersonation user. To enable impersonation for a particular connection user, the configuration parameter templates PropertyKey.Template.MASTER_IMPERSONATION_USERS_OPTION and/or PropertyKey.Template.MASTER_IMPERSONATION_GROUPS_OPTION must be used to specify the users and groups the connection user is allowed to impersonate.

- Field Summary
  
  Fields
  Modifier and Type Field Description
  
  static java.lang.String WILDCARD
- Constructor Summary
  
  Constructors
  Constructor Description
  
  ImpersonationAuthenticator(AlluxioConfiguration conf)
  Constructs a new ImpersonationAuthenticator.
- Method Summary
  
  All Methods Instance Methods Concrete Methods
  Modifier and Type Method Description
  
  void authenticate(java.lang.String connectionUser, java.lang.String impersonationUser)
  - Methods inherited from class java.lang.Object
    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - WILDCARD
```
public static final java.lang.String WILDCARD
```
    See Also:
    
    Constant Field Values
- Constructor Detail
  - ImpersonationAuthenticator
```
public ImpersonationAuthenticator(AlluxioConfiguration conf)
```
    Constructs a new ImpersonationAuthenticator. Note the constructor for this object is expensive. Take care with how many of these are instantiated.
    
    Parameters:
    
    conf - conf Alluxio configuration
- Method Detail
  - authenticate
```
public void authenticate(java.lang.String connectionUser,
                         java.lang.String impersonationUser)
                  throws javax.security.sasl.AuthenticationException
```
    Parameters:
    
    connectionUser - the user of the connection
    
    impersonationUser - the user to impersonate
    
    Throws:
    
    javax.security.sasl.AuthenticationException - if the connectionUser is not allowed to impersonate the impersonationUser