org.dashbuilder.backend.security

Class LoginRedirectServlet

java.lang.Object

javax.servlet.GenericServlet

javax.servlet.http.HttpServlet

org.dashbuilder.backend.security.LoginRedirectServlet

All Implemented Interfaces:

Serializable, javax.servlet.Servlet, javax.servlet.ServletConfig

public class LoginRedirectServlet
extends javax.servlet.http.HttpServlet

A workaround for the servlet form authentication process (j_security_check), which, at least on WildFly 8.1, uses the HTTP POST method when forwarding the request after successful login. This blows up after login, giving an HTTP 405 Method Not Allowed response when the desired resource is a static one, such as a GWT host page.

This servlet works around the issue by sending an HTTP redirect only if the request comes from an authenticated user to a URL of your choice. The end result is that your user will see the real resource's URL in their browser's location bar after login. In addition, this servlet copies all request parameters that were submitted along with the login form (except j_username and j_password) to the redirect URL.

To set this servlet up, configure your web application as follows:

• Declare this servlet in web.xml with init-param display-after-login set to the context-relative URI of the page you want the user to land on after a successful login. (for example, /host_page.html)
• Map this servlet to a url-pattern that makes sense for a sign-in page, such as /login.
• Mark this servlet's url-pattern with a security-constraint that only allows logged-in users to see it. (I know, this part is confusing! The login URL has to be a protected resource!)
• Configure web.xml for auth-method FORM
• Configure the form-login-page and form-error-page to any resource you like. It can even be JSP's under /WEB-INF, since the login and error pages will never display under their "own" URLs. They always display in place of the "real" resource that was being requested by an unauthorized user. In our case, that resource should always be whatever this servlet is mapped to (eg. /login).
• (Optional) set welcome-page-uri to this servlet's uri-pattern, as an easy way to direct new visitors into this tangled web of deceit.

=== COPIED FROM UBERFIRE SERVLETS ===

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static String	DISPLAY_AFTER_LOGIN_INIT_PARAM
static String	DISPLAY_WHEN_NOT_AUTH_INIT_PARAM

Constructor Summary

Constructors

Constructor and Description
LoginRedirectServlet()

Method Summary

Modifier and Type	Method and Description
protected void	doGet(javax.servlet.http.HttpServletRequest req, javax.servlet.http.HttpServletResponse resp)
protected void	doPost(javax.servlet.http.HttpServletRequest req, javax.servlet.http.HttpServletResponse resp)
void	init(javax.servlet.ServletConfig config)

Methods inherited from class javax.servlet.http.HttpServlet

doDelete, doHead, doOptions, doPut, doTrace, getLastModified, service, service

Methods inherited from class javax.servlet.GenericServlet

destroy, getInitParameter, getInitParameterNames, getServletConfig, getServletContext, getServletInfo, getServletName, init, log, log

Methods inherited from class java.lang.Object

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

Field Detail

DISPLAY_AFTER_LOGIN_INIT_PARAM

public static final String DISPLAY_AFTER_LOGIN_INIT_PARAM

See Also:

Constant Field Values

DISPLAY_WHEN_NOT_AUTH_INIT_PARAM

public static final String DISPLAY_WHEN_NOT_AUTH_INIT_PARAM

See Also:

Constant Field Values

Constructor Detail

LoginRedirectServlet

public LoginRedirectServlet()

Method Detail

init

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

Specified by:

init in interface javax.servlet.Servlet

Overrides:

init in class javax.servlet.GenericServlet

Throws:

javax.servlet.ServletException

doGet

protected void doGet(javax.servlet.http.HttpServletRequest req,
                     javax.servlet.http.HttpServletResponse resp)
              throws javax.servlet.ServletException,
                     IOException

Overrides:

doGet in class javax.servlet.http.HttpServlet

Throws:

javax.servlet.ServletException

IOException

doPost

protected void doPost(javax.servlet.http.HttpServletRequest req,
                      javax.servlet.http.HttpServletResponse resp)
               throws javax.servlet.ServletException,
                      IOException

Overrides:

doPost in class javax.servlet.http.HttpServlet

Throws:

javax.servlet.ServletException

IOException