Why does my Authorization Redirect Fail on JSF Form Submit?

Authorization Redirect Fails on JSF Form Submit Due to Improper Implementation

When implementing custom authorization in JSF, it's crucial to use the correct tools and methods. In this case, a custom FacesServlet is not suitable for handling authorization checks.

The issue arises because the custom FacesServlet intercepts all requests, including JSF command link/button submissions. However, these submissions often trigger AJAX requests, which expect a specific XML response instructing the JSF ajax engine to redirect the page.

By sending a redirect header to an AJAX request, the custom FacesServlet effectively renders the response invalid, resulting in an unchanged page. Instead, it should return a special XML response redirecting the browser.

Furthermore, the use of a custom FacesServlet for authorization is generally discouraged. A servlet filter is a more appropriate mechanism for handling this task. It offers greater flexibility and avoids potential conflicts with the FacesServlet, which is responsible for JSF processing.

Correct Implementation Using a Servlet Filter

A servlet filter can be configured to intervene before every request, enabling authorization checks. Consider the following example:

<code class="java">@WebFilter("/*")
public class AuthorizationFilter implements Filter {

    // Generate XML response for AJAX redirects
    private static final String AJAX_REDIRECT_XML = "...";

    @Override
    public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws ... {
        HttpServletRequest request = (HttpServletRequest) req;
        HttpServletResponse response = (HttpServletResponse) res;
        HttpSession session = request.getSession(false);

        // Define authorization flags
        boolean loggedIn = ...;
        boolean loginRequest = ...;
        boolean resourceRequest = ...;
        boolean ajaxRequest = ...;

        // Handle authorization and redirection
        if (loggedIn || loginRequest || resourceRequest) {
            // Continue request
            chain.doFilter(request, response);
        } else if (ajaxRequest) {
            // Return XML response for AJAX redirects
            response.getWriter().printf(AJAX_REDIRECT_XML, loginURL);
        } else {
            // Perform synchronous redirect
            response.sendRedirect(loginURL);
        }
    }
}</code>

This filter provides fine-grained control over authorization and ensures that both standard and AJAX requests are handled correctly, redirecting users to the login page if necessary.

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