AuthenticationHandler (Hadoop 1.2.1 API)
Date: 2013-07-22

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## org.apache.hadoop.security.authentication.server
Interface AuthenticationHandler

All Known Implementing Classes:
  KerberosAuthenticationHandler, PseudoAuthenticationHandler

    public interface AuthenticationHandler

Interface for server authentication mechanisms.

The `AuthenticationFilter` manages the lifecycle of the authentication handler.

Implementations must be thread-safe as one instance is initialized and used for all requests.

Method Summary
`AuthenticationToken` | `authenticate(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response)` Performs an authentication step for the given HTTP client request.
`void` | `destroy()` Destroys the authentication handler instance.
`String` | `getType()` Returns the authentication type of the authentication handler.
`void` | `init(Properties config)` Initializes the authentication handler instance.

Method Detail

### getType

    String getType()

  Returns the authentication type of the authentication handler.

  This should be a name that uniquely identifies the authentication type. For example 'simple' or 'kerberos'.

  Returns:
    the authentication type of the authentication handler.

### init

    void init(Properties config)
              throws javax.servlet.ServletException

  Initializes the authentication handler instance.

  This method is invoked by the `AuthenticationFilter.init(javax.servlet.FilterConfig)` method.

  Parameters:
    `config` - configuration properties to initialize the handler.
  Throws:
    `javax.servlet.ServletException` - thrown if the handler could not be initialized.

### destroy

    void destroy()

  Destroys the authentication handler instance.

  This method is invoked by the `AuthenticationFilter.destroy()` method.

### authenticate

    AuthenticationToken authenticate(javax.servlet.http.HttpServletRequest request,
                                     javax.servlet.http.HttpServletResponse response)
                                     throws IOException,
                                            AuthenticationException

  Performs an authentication step for the given HTTP client request.

  This method is invoked by the `AuthenticationFilter` only if the HTTP client request is not yet authenticated.

  Depending upon the authentication mechanism being implemented, a particular HTTP client may end up making a sequence of invocations before authentication is successfully established (this is the case of Kerberos SPNEGO).

  This method must return an `AuthenticationToken` only if the the HTTP client request has been successfully and fully authenticated.

  If the HTTP client request has not been completely authenticated, this method must take over the corresponding HTTP response and it must return `null`.

  Parameters:
    `request` - the HTTP client request.
    `response` - the HTTP client response.
  Returns:
    an `AuthenticationToken` if the HTTP client request has been authenticated, `null` otherwise (in this case it must take care of the response).
  Throws:
    `IOException` - thrown if an IO error occurred.
    `AuthenticationException` - thrown if an Authentication error occurred.

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