org.apache.wiki.ui
Class WikiServletFilter

java.lang.Object
  org.apache.wiki.ui.WikiServletFilter

All Implemented Interfaces:

javax.servlet.Filter

Direct Known Subclasses:

WikiJSPFilter

public class WikiServletFilter
extends Object
implements javax.servlet.Filter

Filter that verifies that the WikiEngine is running, and sets the authentication status for the user's WikiSession. Each HTTP request processed by this filter is wrapped by a WikiRequestWrapper. The wrapper's primary responsibility is to return the correct userPrincipal and remoteUser for authenticated JSPWiki users (whether authenticated by container or by JSPWiki's custom system). The wrapper's other responsibility is to incorporate JSPWiki built-in roles into the role-checking algorithm for HttpServletRequest.isUserInRole(String). Just before the request is wrapped, the method AuthenticationManager.login(HttpServletRequest) executes; this method contains all of the logic needed to grab any user login credentials set by the container or by cookies.

Field Summary

protected static org.apache.log4j.Logger	log
protected WikiEngine	m_engine

Constructor Summary

WikiServletFilter()
Creates a Wiki Servlet Filter.

Method Summary

void	destroy() Destroys the WikiServletFilter.
void	doFilter(javax.servlet.ServletRequest request, javax.servlet.ServletResponse response, javax.servlet.FilterChain chain) Checks that the WikiEngine is running ok, wraps the current HTTP request, and sets the correct authentication state for the users's WikiSession.
protected WikiContext	getWikiContext(javax.servlet.ServletRequest request) Figures out the wiki context from the request.
void	init(javax.servlet.FilterConfig config) Initializes the WikiServletFilter.

Methods inherited from class java.lang.Object

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

Field Detail

log

protected static final org.apache.log4j.Logger log

m_engine

protected WikiEngine m_engine

Constructor Detail

WikiServletFilter

public WikiServletFilter()

Creates a Wiki Servlet Filter.

Method Detail

init

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

Initializes the WikiServletFilter.

Specified by:

init in interface javax.servlet.Filter

Parameters:

config - The FilterConfig.

Throws:

javax.servlet.ServletException - If a WikiEngine cannot be started.

destroy

public void destroy()

Destroys the WikiServletFilter.

Specified by:

destroy in interface javax.servlet.Filter

doFilter

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

Checks that the WikiEngine is running ok, wraps the current HTTP request, and sets the correct authentication state for the users's WikiSession. First, the method AuthenticationManager.login(HttpServletRequest) executes, which sets the authentication state. Then, the request is wrapped with a WikiRequestWrapper.

Specified by:

doFilter in interface javax.servlet.Filter

Parameters:

request - the current HTTP request object

response - the current HTTP response object

chain - The Filter chain passed down.

Throws:

javax.servlet.ServletException - if AuthenticationManager.login(HttpServletRequest) fails for any reason

IOException - If writing to the servlet response fails.

getWikiContext

protected WikiContext getWikiContext(javax.servlet.ServletRequest request)

Figures out the wiki context from the request. This method does not create the context if it does not exist.

Parameters:

request - The request to examine

Returns:

A valid WikiContext value (or null, if the context could not be located).