org.surfnet.oaaas.auth

Class AbstractAuthenticator

java.lang.Object

org.surfnet.oaaas.auth.AbstractFilter

org.surfnet.oaaas.auth.AbstractAuthenticator

All Implemented Interfaces:

javax.servlet.Filter

Direct Known Subclasses:

NoopAuthenticator

public abstract class AbstractAuthenticator
extends AbstractFilter

To be implemented by various authentication methods.

Field Summary

Fields

Modifier and Type	Field and Description
static String	PRINCIPAL The constant that contains the principal, set by concrete authenticators and consumed by the authorization endpoint.

Fields inherited from class org.surfnet.oaaas.auth.AbstractFilter

AUTH_STATE, RETURN_URI

Constructor Summary

Constructors

Constructor and Description
AbstractAuthenticator()

Method Summary

Methods

Modifier and Type	Method and Description
abstract void	authenticate(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response, javax.servlet.FilterChain chain, String authStateValue, String returnUri) Implement this method to perform the actual authentication.
abstract boolean	canCommence(javax.servlet.http.HttpServletRequest request) Implement this method to state whether the given request is a continuation that can be handled.
void	destroy()
void	doFilter(javax.servlet.ServletRequest request, javax.servlet.ServletResponse response, javax.servlet.FilterChain chain)
void	init(javax.servlet.FilterConfig filterConfig)
protected void	setPrincipal(javax.servlet.ServletRequest request, AuthenticatedPrincipal principal) Set the given principal on the request.

Methods inherited from class org.surfnet.oaaas.auth.AbstractFilter

getAuthStateValue, getReturnUri, setAuthStateValue

Methods inherited from class java.lang.Object

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

Field Detail

PRINCIPAL

public static final String PRINCIPAL

The constant that contains the principal, set by concrete authenticators and consumed by the authorization endpoint.

See Also:

Constant Field Values

Constructor Detail

AbstractAuthenticator

public AbstractAuthenticator()

Method Detail

doFilter

public final void doFilter(javax.servlet.ServletRequest request,
            javax.servlet.ServletResponse response,
            javax.servlet.FilterChain chain)
                    throws IOException,
                           javax.servlet.ServletException

Throws:

IOException

javax.servlet.ServletException

canCommence

public abstract boolean canCommence(javax.servlet.http.HttpServletRequest request)

Implement this method to state whether the given request is a continuation that can be handled. This method will be called for every consecutive request after the initial one.
Returning true means that the request is part of an ongoing authentication.
Returning false indicates to the framework that the request is not known.
Typically this can be determined by the http method or one or more request parameters/attributes being present.

Parameters:

request - the HttpServletRequest

authenticate

public abstract void authenticate(javax.servlet.http.HttpServletRequest request,
                javax.servlet.http.HttpServletResponse response,
                javax.servlet.FilterChain chain,
                String authStateValue,
                String returnUri)
                           throws IOException,
                                  javax.servlet.ServletException

Implement this method to perform the actual authentication. Use BasicAuthenticator or FormLoginAuthenticator as an example. In general, the contract is:

assert that the user is authenticated. You can use the request and response for this. When not yet authenticated:

• use AbstractFilter.getAuthStateValue(javax.servlet.ServletRequest) to pass-around for user agent communication
• use AbstractFilter.getReturnUri(javax.servlet.ServletRequest) if you need to step out and return to the current location

When authenticated:

• set the authState attribute, by calling AbstractFilter.setAuthStateValue(javax.servlet.ServletRequest, String)
• set the principal attribute, by calling #setPrincipal(ServletRequest, RolesPrincipal)
• call chain.doFilter(request, response) to let the flow continue..

Parameters:

request - the ServletRequest

response - the ServletResponse

chain - the original http servlet filter chain

authStateValue - the authState nonce to set back on the ServletRequest when done

returnUri - the startpoint of the chain if you want to return from a form or other (external) component

Throws:

IOException

javax.servlet.ServletException

setPrincipal

protected final void setPrincipal(javax.servlet.ServletRequest request,
                AuthenticatedPrincipal principal)

Set the given principal on the request.

Parameters:

request - the original ServletRequest

principal - the Principal to set.

init

public void init(javax.servlet.FilterConfig filterConfig)
          throws javax.servlet.ServletException

Throws:

javax.servlet.ServletException

destroy

public void destroy()