/*
 *
 *    OPEN-XCHANGE legal information
 *
 *    All intellectual property rights in the Software are protected by
 *    international copyright laws.
 *
 *
 *    In some countries OX, OX Open-Xchange, open xchange and OXtender
 *    as well as the corresponding Logos OX Open-Xchange and OX are registered
 *    trademarks of the Open-Xchange, Inc. group of companies.
 *    The use of the Logos is not covered by the GNU General Public License.
 *    Instead, you are allowed to use these Logos according to the terms and
 *    conditions of the Creative Commons License, Version 2.5, Attribution,
 *    Non-commercial, ShareAlike, and the interpretation of the term
 *    Non-commercial applicable to the aforementioned license is published
 *    on the web site http://www.open-xchange.com/EN/legal/index.html.
 *
 *    Please make sure that third-party modules and libraries are used
 *    according to their respective licenses.
 *
 *    Any modifications to this package must retain all copyright notices
 *    of the original copyright holder(s) for the original code used.
 *
 *    After any such modifications, the original and derivative code shall remain
 *    under the copyright of the copyright holder(s) and/or original author(s)per
 *    the Attribution and Assignment Agreement that can be located at
 *    http://www.open-xchange.com/EN/developer/. The contributing author shall be
 *    given Attribution for the derivative code and a license granting use.
 *
 *     Copyright (C) 2004-2010 Open-Xchange, Inc.
 *     Mail: info@open-xchange.com
 *
 *
 *     This program is free software; you can redistribute it and/or modify it
 *     under the terms of the GNU General Public License, Version 2 as published
 *     by the Free Software Foundation.
 *
 *     This program is distributed in the hope that it will be useful, but
 *     WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 *     or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
 *     for more details.
 *
 *     You should have received a copy of the GNU General Public License along
 *     with this program; if not, write to the Free Software Foundation, Inc., 59
 *     Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 */

package com.openexchange.file.storage.json.servlets;

import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.openexchange.ajax.MultipleAdapterServletNew;
import com.openexchange.ajax.helper.DownloadUtility;
import com.openexchange.ajax.helper.DownloadUtility.CheckedDownload;
import com.openexchange.ajax.requesthandler.AJAXRequestData;
import com.openexchange.file.storage.File;
import com.openexchange.file.storage.composition.IDBasedFileAccess;
import com.openexchange.file.storage.json.actions.files.AJAXInfostoreRequest;
import com.openexchange.file.storage.json.actions.files.AbstractFileAction;
import com.openexchange.file.storage.json.actions.files.FileActionFactory;
import com.openexchange.groupware.AbstractOXException;
import com.openexchange.tools.servlet.http.Tools;
import com.openexchange.tools.session.ServerSession;

/**
 * {@link FileServlet}
 * 
 * @author <a href="mailto:francisco.laguna@open-xchange.com">Francisco Laguna</a>
 */
public class FileServlet extends MultipleAdapterServletNew {

    private static final String DOCUMENT = "document";
    private static final String PARAMETER_CONTENT_DISPOSITION = "content_disposition";

    /**
     * Initializes a new {@link FileServlet}.
     * 
     * @param factory
     */
    public FileServlet() {
        super(FileActionFactory.INSTANCE);
    }

    @Override
    protected boolean hasModulePermission(ServerSession session) {
        return true;
    }

    @Override
    protected boolean handleIndividually(String action, AJAXRequestData data, HttpServletRequest req, HttpServletResponse res) throws IOException, AbstractOXException {
        if (action.equals(DOCUMENT)) {
            AJAXInfostoreRequest request = new AJAXInfostoreRequest(data, getSessionObject(req));
            request.require(AbstractFileAction.Param.ID);

            String contentType = req.getParameter(PARAMETER_CONTENT_TYPE);
            String userAgent = req.getHeader("user-agent");
            String contentDisposition = req.getParameter(PARAMETER_CONTENT_DISPOSITION);
            
            IDBasedFileAccess fileAccess = request.getFileAccess();
            File fileMetadata = fileAccess.getFileMetadata(request.getId(), request.getVersion());

            InputStream documentData = new BufferedInputStream(fileAccess.getDocument(request.getId(), request.getVersion()));
            ServletOutputStream outputStream = res.getOutputStream();
            try {

                if (SAVE_AS_TYPE.equals(contentType)) {
                    Tools.setHeaderForFileDownload(userAgent, res, fileMetadata.getFileName(), contentDisposition);
                    res.setContentType(contentType);
                } else {
                    final CheckedDownload checkedDownload = DownloadUtility.checkInlineDownload(
                        documentData,
                        fileMetadata.getFileName(),
                        fileMetadata.getFileMIMEType(),
                        contentDisposition,
                        userAgent);
                    if(contentDisposition != null) {
                        res.setHeader("Content-Disposition", contentDisposition);
                    } else {
                        res.setHeader("Content-Disposition", checkedDownload.getContentDisposition());
                    }
                    if(contentType != null) {
                        res.setContentType(contentType);
                    } else {
                        res.setContentType(checkedDownload.getContentType());
                    }
                    documentData = checkedDownload.getInputStream();
                }
                // Browsers doesn't like the Pragma header the way we usually set
                // this. Especially if files are sent to the browser. So removing
                // pragma header
                Tools.removeCachingHeader(res);

                int i = -1;
                while ((i = documentData.read()) != -1) {
                    outputStream.write(i);
                }
                outputStream.flush();

            } finally {
                if (documentData != null) {
                    documentData.close();
                }
                fileAccess.finish();
            }

            return true;
        }
        return false;
    }

}
