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

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Here is the source code for at.gv.egiz.bku.online.webapp.WebRequestHandler.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.ByteArrayInputStream;
import java.io.InputStream;
import java.util.Enumeration;
import java.util.LinkedHashMap;
import java.util.Locale;

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.BindingProcessorManager;
import at.gv.egiz.bku.binding.BindingProcessorManagerImpl;
import at.gv.egiz.bku.binding.HTTPBindingProcessor;
import at.gv.egiz.bku.binding.HttpUtil;
import at.gv.egiz.bku.binding.Id;
import at.gv.egiz.bku.binding.InputDecoderFactory;
import at.gv.egiz.org.apache.tomcat.util.http.AcceptLanguage;

public class WebRequestHandler extends HttpServlet {

    private static final long serialVersionUID = 1L;

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

    private String uiRedirectUrl = "ui";

    @Override
    public void init() throws ServletException {
        String url = MoccaParameterBean.getInitParameter("uiRedirectUrl", getServletConfig(), getServletContext());
        if (url != null) {
            uiRedirectUrl = url;
            log.info("Init uiRedirectUrl to: {}.", uiRedirectUrl);
        }
    }

    @Override
    protected void doPost(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");
        if (id == null) {
            String msg = "No request id! Configuration error: ServletFilter missing?";
            log.error(msg);
            resp.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, msg);
            return;
        }

        // if binding processor with same id is present: remove
        bindingProcessorManager.removeBindingProcessor(id);

        Locale locale = AcceptLanguage.getLocale(req.getHeader("Accept-Language"));
        if (log.isInfoEnabled()) {
            log.info("Received request (Accept-Language locale: {}).", locale);
        }

        // create new binding processor
        String protocol = MoccaParameterBean.getInitParameter("protocol", getServletConfig(), getServletContext());
        if (protocol == null || protocol.isEmpty()) {
            protocol = req.getScheme();
        }
        HTTPBindingProcessor bindingProcessor = (HTTPBindingProcessor) bindingProcessorManager
                .createBindingProcessor(protocol, locale);

        // set headers
        LinkedHashMap<String, String> headerMap = new LinkedHashMap<String, String>();
        if (req.getHeaderNames() != null) {
            for (Enumeration<?> headerName = req.getHeaderNames(); headerName.hasMoreElements();) {
                String name = (String) headerName.nextElement();
                // Account for multiple headers with the same field-name, but
                // they are very rare, so we are not using a StringBuffer.
                Enumeration<?> headers = req.getHeaders(name);
                String value = null;
                while (headers.hasMoreElements()) {
                    value = (value == null) ? (String) headers.nextElement() : value + ", " + headers.nextElement();
                }
                headerMap.put(name, value);
            }
        }

        // set request stream 
        InputStream inputStream;
        if (req.getMethod().equals("POST")) {
            inputStream = req.getInputStream();
        } else {
            headerMap.put(HttpUtil.HTTP_HEADER_CONTENT_TYPE, InputDecoderFactory.URL_ENCODED);
            String queryString = req.getQueryString();
            if (queryString != null) {
                inputStream = new ByteArrayInputStream(queryString.getBytes("UTF-8"));
            } else {
                inputStream = new ByteArrayInputStream(new byte[] {});
            }
        }

        bindingProcessor.setHTTPHeaders(headerMap);
        bindingProcessor.consumeRequestStream(req.getRequestURL().toString(), inputStream);
        inputStream.close();

        // process
        bindingProcessorManager.process(id, bindingProcessor);

        log.debug("Sending redirect to user interface.");
        resp.sendRedirect(resp.encodeRedirectURL(uiRedirectUrl));

    }

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, java.io.IOException {
        doPost(req, resp);
    }
}