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/*
 * Copyright 2008-2013 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.broadleafcommerce.openadmin.security;

import org.springframework.security.core.Authentication;
import org.springframework.security.web.authentication.SimpleUrlAuthenticationSuccessHandler;
import org.springframework.security.web.savedrequest.HttpSessionRequestCache;
import org.springframework.security.web.savedrequest.RequestCache;
import org.springframework.security.web.savedrequest.SavedRequest;
import org.springframework.util.StringUtils;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * @author Jeff Fischer
 */
public class BroadleafAdminAuthenticationSuccessHandler extends SimpleUrlAuthenticationSuccessHandler {

    private RequestCache requestCache = new HttpSessionRequestCache();
    
    private final String successUrlParameter = "successUrl=";

    @Override
    public void onAuthenticationSuccess(HttpServletRequest request, HttpServletResponse response,
            Authentication authentication) throws ServletException, IOException {
        SavedRequest savedRequest = requestCache.getRequest(request, response);

        if (savedRequest == null) {
            super.onAuthenticationSuccess(request, response, authentication);

            return;
        }
        String targetUrlParameter = getTargetUrlParameter();
        if (isAlwaysUseDefaultTargetUrl() || (targetUrlParameter != null && StringUtils.hasText(request.getParameter(targetUrlParameter)))) {
            requestCache.removeRequest(request, response);
            super.onAuthenticationSuccess(request, response, authentication);

            return;
        }

        clearAuthenticationAttributes(request);
        // Use the DefaultSavedRequest URL
        String targetUrl = savedRequest.getRedirectUrl();
        // Remove the sessionTimeout flag if necessary
        targetUrl = targetUrl.replace("sessionTimeout=true", "");
        if (targetUrl.charAt(targetUrl.length() - 1) == '?') {
            targetUrl = targetUrl.substring(0, targetUrl.length() - 1);
        }

        if (targetUrl.contains(successUrlParameter)) {
            int successUrlPosistion = targetUrl.indexOf(successUrlParameter) + successUrlParameter.length();
            int nextParamPosistion = targetUrl.indexOf("&", successUrlPosistion);
            if (nextParamPosistion == -1) {
                targetUrl = targetUrl.substring(successUrlPosistion, targetUrl.length());
            } else {
                targetUrl = targetUrl.substring(successUrlPosistion, nextParamPosistion);
            }
        }

        logger.debug("Redirecting to DefaultSavedRequest Url: " + targetUrl);
        getRedirectStrategy().sendRedirect(request, response, targetUrl);
    }
}