source: branches/TaskRewrite/src/plugins/acegi-0.5.1/src/java/org/codehaus/groovy/grails/plugins/springsecurity/GrailsAccessDeniedHandlerImpl.java @ 58

/* Copyright 2006-2009 the original author or authors.
 *
 * 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.codehaus.groovy.grails.plugins.springsecurity;

import java.io.IOException;

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

import org.springframework.beans.factory.InitializingBean;
import org.springframework.security.AccessDeniedException;
import org.springframework.security.Authentication;
import org.springframework.security.AuthenticationTrustResolver;
import org.springframework.security.AuthenticationTrustResolverImpl;
import org.springframework.security.context.SecurityContextHolder;
import org.springframework.security.ui.AbstractProcessingFilter;
import org.springframework.security.ui.AccessDeniedHandler;
import org.springframework.security.ui.savedrequest.SavedRequest;
import org.springframework.security.userdetails.UserDetails;
import org.springframework.security.util.PortResolver;
import org.springframework.util.Assert;

/**
 * {@link AccessDeniedHandler} for redirect to errorPage (not RequestDispatcher#forward).
 *
 * @author T.Yamamoto
 * @author <a href='mailto:beckwithb@studentsonly.com'>Burt Beckwith</a>
 */
public class GrailsAccessDeniedHandlerImpl implements AccessDeniedHandler, InitializingBean {

        private String errorPage;
        private String ajaxErrorPage;
        private String ajaxHeader = WithAjaxAuthenticationProcessingFilterEntryPoint.AJAX_HEADER;
        private PortResolver portResolver;
        private final AuthenticationTrustResolver authenticationTrustResolver = new AuthenticationTrustResolverImpl();

        /**
         * {@inheritDoc}
         * @see org.springframework.security.ui.AccessDeniedHandler#handle(
         *      javax.servlet.ServletRequest, javax.servlet.ServletResponse,
         *      org.springframework.security.AccessDeniedException)
         */
        public void handle(final ServletRequest req, final ServletResponse res, final AccessDeniedException e)
                        throws IOException {

                HttpServletRequest request = (HttpServletRequest)req;
                HttpServletResponse response = (HttpServletResponse)res;

                if (e != null && isLoggedIn() && authenticationTrustResolver.isRememberMe(getAuthentication())) {
                        // user has a cookie but is getting bounced because of IS_AUTHENTICATED_FULLY,
                        // so Acegi won't save the original request
                        request.getSession().setAttribute(
                                        AbstractProcessingFilter.SPRING_SECURITY_SAVED_REQUEST_KEY,
                                        new SavedRequest(request, portResolver));
                }

                if (errorPage != null || (ajaxErrorPage != null && request.getHeader(ajaxHeader) != null)) {
                        boolean includePort = true;
                        String scheme = request.getScheme();
                        String serverName = request.getServerName();
                        int serverPort = portResolver.getServerPort(request);
                        String contextPath = request.getContextPath();
                        boolean inHttp = "http".equals(scheme.toLowerCase());
                        boolean inHttps = "https".equals(scheme.toLowerCase());

                        if (inHttp && (serverPort == 80)) {
                                includePort = false;
                        }
                        else if (inHttps && (serverPort == 443)) {
                                includePort = false;
                        }

                        String commonRedirectUrl = scheme + "://" + serverName + ((includePort) ? (":" + serverPort) : "")
                                        + contextPath;
                        String redirectUrl = commonRedirectUrl;
                        if (ajaxErrorPage != null && request.getHeader(ajaxHeader) != null) {
                                redirectUrl += ajaxErrorPage;
                        }
                        else if (errorPage != null) {
                                redirectUrl += errorPage;
                        }
                        else {
                                response.sendError(HttpServletResponse.SC_FORBIDDEN, e.getMessage());
                        }

                        response.sendRedirect(response.encodeRedirectURL(redirectUrl));
                }

                if (!response.isCommitted()) {
                        // Send 403 (we do this after response has been written)
                        response.sendError(HttpServletResponse.SC_FORBIDDEN, e.getMessage());
                }
        }

        private boolean isLoggedIn() {
                if (getAuthentication() == null) {
                        return false;
                }
                return getAuthentication().getPrincipal() instanceof UserDetails;
        }

        private Authentication getAuthentication() {
                return SecurityContextHolder.getContext() == null ? null
                                : SecurityContextHolder.getContext().getAuthentication();
        }

        /**
         * Dependency injection for the error page, e.g. '/login/denied'.
         * @param page  the page
         */
        public void setErrorPage(final String page) {
                if (page != null && !page.startsWith("/")) {
                        throw new IllegalArgumentException("ErrorPage must begin with '/'");
                }
                errorPage = page;
        }

        /**
         * Dependency injection for the Ajax error page, e.g. '/login/deniedAjax'.
         * @param page  the page
         */
        public void setAjaxErrorPage(final String page) {
                if (page != null && !page.startsWith("/")) {
                        throw new IllegalArgumentException("ErrorPage must begin with '/'");
                }
                ajaxErrorPage = page;
        }

        /**
         * Dependency injection for the Ajax header name; defaults to 'X-Requested-With'.
         * @param header  the header name
         */
        public void setAjaxHeader(final String header) {
                ajaxHeader = header;
        }

        /**
         * Dependency injection for the port resolver.
         * @param resolver  the resolver
         */
        public void setPortResolver(final PortResolver resolver) {
                portResolver = resolver;
        }

        /**
         * {@inheritDoc}
         * @see org.springframework.beans.factory.InitializingBean#afterPropertiesSet()
         */
        public void afterPropertiesSet() {
                Assert.notNull(ajaxHeader, "ajaxHeader is required");
                Assert.notNull(portResolver, "portResolver is required");
        }
}