at.gv.egiz.bku.online.webapp.ResultServlet.java Source code

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Here is the source code for at.gv.egiz.bku.online.webapp.ResultServlet.java

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/*
 * Copyright 2011 by Graz University of Technology, Austria
 * MOCCA has been developed by the E-Government Innovation Center EGIZ, a joint
 * initiative of the Federal Chancellery Austria and Graz University of Technology.
 *
 * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
 * the European Commission - subsequent versions of the EUPL (the "Licence");
 * You may not use this work except in compliance with the Licence.
 * You may obtain a copy of the Licence at:
 * http://www.osor.eu/eupl/
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the Licence is distributed on an "AS IS" basis,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Licence for the specific language governing permissions and
 * limitations under the Licence.
 *
 * This product combines work with different licenses. See the "NOTICE" text
 * file for details on the various modules and licenses.
 * The "NOTICE" text file is part of the distribution. Any derivative works
 * that you distribute must include a readable copy of the "NOTICE" text file.
 */

package at.gv.egiz.bku.online.webapp;

import java.io.IOException;
import java.io.OutputStream;
//import java.net.MalformedURLException;
//import java.net.URL;
import java.util.Map;
import java.util.Map.Entry;

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

import org.apache.commons.configuration.Configuration;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import at.gv.egiz.bku.binding.BindingProcessor;
import at.gv.egiz.bku.binding.BindingProcessorManager;
import at.gv.egiz.bku.binding.BindingProcessorManagerImpl;
import at.gv.egiz.bku.binding.HTTPBindingProcessor;
import at.gv.egiz.bku.binding.Id;
import at.gv.egiz.bku.utils.NullOutputStream;

/**
 * Delivers the result to the browser
 * 
 */
public class ResultServlet extends HttpServlet {

    private static final long serialVersionUID = 1L;

    private final Logger log = LoggerFactory.getLogger(ResultServlet.class);

    private String responseEncoding = "UTF-8";

    private String expiredPageUrl = "expired.jsp";

    @Override
    public void init() throws ServletException {
        String encoding = MoccaParameterBean.getInitParameter("responseEncoding", getServletConfig(),
                getServletContext());
        if (encoding != null) {
            log.info("Init default responseEncoding to: {}.", encoding);
            responseEncoding = encoding;
        }
        String url = MoccaParameterBean.getInitParameter("expiredPageUrl", getServletConfig(), getServletContext());
        if (url != null) {
            //      try {
            //        expiredPageUrl = new URL(url).toString();
            //        log.info("Init expiredPageUrl to: {}.", expiredPageUrl);
            //      } catch (MalformedURLException e) {
            //        log.error("Failed to set expiredUrlPage '{}': {}.", url, e);
            //      }
            expiredPageUrl = url;
            log.info("Init expiredPageUrl to: {}.", expiredPageUrl);
        }
    }

    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req, resp);
    }

    protected void doGet(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, java.io.IOException {

        BindingProcessorManager bindingProcessorManager = (BindingProcessorManager) getServletContext()
                .getAttribute("bindingProcessorManager");
        if (bindingProcessorManager == null) {
            String msg = "Configuration error: BindingProcessorManager missing!";
            log.error(msg);
            resp.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, msg);
            return;
        }

        Configuration conf = ((BindingProcessorManagerImpl) bindingProcessorManager).getConfiguration();
        if (conf == null)
            log.error("No configuration");
        else
            MoccaParameterBean.setP3PHeader(conf, resp);

        Id id = (Id) req.getAttribute("id");
        BindingProcessor bindingProcessor = null;
        if (id == null || !((bindingProcessor = bindingProcessorManager
                .getBindingProcessor(id)) instanceof HTTPBindingProcessor)) {
            resp.sendRedirect(expiredPageUrl);
            return;
        }

        HTTPBindingProcessor bp = (HTTPBindingProcessor) bindingProcessor;

        OutputStream outputStream = null;
        try {
            String redirectUrl = bp.getRedirectURL();
            if (redirectUrl != null && !redirectUrl.trim().isEmpty()) {
                log.info("Sending (deferred) redirect to {}.", redirectUrl);
                resp.sendRedirect(redirectUrl);
                // TODO Couldn't we simply discard the output?
                outputStream = new NullOutputStream();
            } else {
                log.debug("Setting HTTP status code {}.", bp.getResponseCode());
                resp.setStatus(bp.getResponseCode());
                resp.setHeader("Cache-Control", "no-store"); // HTTP 1.1
                resp.setHeader("Pragma", "no-cache"); // HTTP 1.0
                resp.setDateHeader("Expires", 0);
                Map<String, String> responseHeaders = bp.getResponseHeaders();
                for (Entry<String, String> header : responseHeaders.entrySet()) {
                    String key = header.getKey();
                    String value = header.getValue();
                    log.debug("Setting response header {}: {}.", key, value);
                    resp.setHeader(key, value);
                }
                resp.setContentType(bp.getResultContentType());
                log.info("Sending result.");
                outputStream = resp.getOutputStream();
            }
            bp.writeResultTo(outputStream, responseEncoding);
        } finally {
            if (outputStream != null)
                outputStream.close();
            bindingProcessorManager.removeBindingProcessor(id);
        }
    }
}