org.acegisecurity.ui.AccessDeniedHandlerImpl Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of acegi-security Show documentation
There is a newer version: 1.0.7
/* Copyright 2004, 2005, 2006 Acegi Technology Pty Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.acegisecurity.ui;

import org.acegisecurity.AccessDeniedException;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import java.io.IOException;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


/**
 * Base implementation of {@link AccessDeniedHandler}.This implementation sends a 403 (SC_FORBIDDEN) HTTP error
 * code. In addition, if a {@link #errorPage} is defined, the implementation will perform a request dispatcher
 * "forward" to the specified error page view. Being a "forward", the SecurityContextHolder will remain
 * populated. This is of benefit if the view (or a tag library or macro) wishes to access the
 * SecurityContextHolder. The request scope will also be populated with the exception itself, available
 * from the key {@link #ACEGI_SECURITY_ACCESS_DENIED_EXCEPTION_KEY}.
 *
 * @author Ben Alex
 * @version $Id: AccessDeniedHandlerImpl.java 1496 2006-05-23 13:38:33Z benalex $
 */
public class AccessDeniedHandlerImpl implements AccessDeniedHandler {
    //~ Static fields/initializers =====================================================================================

    public static final String ACEGI_SECURITY_ACCESS_DENIED_EXCEPTION_KEY = "ACEGI_SECURITY_403_EXCEPTION";
    protected final static Log logger = LogFactory.getLog(AccessDeniedHandlerImpl.class);

    //~ Instance fields ================================================================================================

    private String errorPage;

    //~ Methods ========================================================================================================

    public void handle(ServletRequest request, ServletResponse response, AccessDeniedException accessDeniedException)
        throws IOException, ServletException {
        if (errorPage != null) {
            // Put exception into request scope (perhaps of use to a view)
            ((HttpServletRequest) request).setAttribute(ACEGI_SECURITY_ACCESS_DENIED_EXCEPTION_KEY,
                accessDeniedException);

            // Perform RequestDispatcher "forward"
            RequestDispatcher rd = request.getRequestDispatcher(errorPage);

            try {
                rd.forward(request, response);
                ((HttpServletResponse) response).setStatus(HttpServletResponse.SC_FORBIDDEN);

                return;
            } catch (Exception responseCommitted) {
                if (logger.isErrorEnabled()) {
                    logger.error("Error processing " + request.toString(), responseCommitted);
                }
            }
        }

        // Send 403 (we do this after response has been written)
        ((HttpServletResponse) response).sendError(HttpServletResponse.SC_FORBIDDEN, accessDeniedException.getMessage());
    }

    /**
     * The error page to use. Must begin with a "/" and is interpreted relative to the current context root.
     *
     * @param errorPage the dispatcher path to display
     *
     * @throws IllegalArgumentException if the argument doesn't comply with the above limitations
     */
    public void setErrorPage(String errorPage) {
        if ((errorPage != null) && !errorPage.startsWith("/")) {
            throw new IllegalArgumentException("ErrorPage must begin with '/'");
        }

        this.errorPage = errorPage;
    }
}