cn.vlabs.clb.server.ui.frameservice.pdf.handler.GetPdfContentHandler.java Source code

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Here is the source code for cn.vlabs.clb.server.ui.frameservice.pdf.handler.GetPdfContentHandler.java

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/*
 * Copyright (c) 2008-2016 Computer Network Information Center (CNIC), Chinese Academy of Sciences.
 * 
 * This file is part of Duckling project.
 *
 * 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 cn.vlabs.clb.server.ui.frameservice.pdf.handler;

import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;

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

import org.apache.commons.io.IOUtils;

import cn.vlabs.clb.server.config.AppFacade;
import cn.vlabs.clb.server.exception.BaseException;
import cn.vlabs.clb.server.model.DocMeta;
import cn.vlabs.clb.server.model.PdfItem;
import cn.vlabs.clb.server.ui.frameservice.CLBAbstractActionWithStream;
import cn.vlabs.clb.server.ui.frameservice.DPair;
import cn.vlabs.clb.server.ui.frameservice.auth.AuthFacade;
import cn.vlabs.clb.server.ui.frameservice.document.DocumentFacade;
import cn.vlabs.clb.server.ui.frameservice.pdf.PdfFacade;
import cn.vlabs.clb.server.utils.ResponseHeaderUtils;
import cn.vlabs.rest.ServiceException;
import cn.vlabs.rest.TakeOver;
import cn.vlabs.rest.stream.IResource;

import com.mongodb.gridfs.GridFSDBFile;

public class GetPdfContentHandler extends CLBAbstractActionWithStream {

    private PdfFacade pf = AppFacade.getPdfFacade();
    private DocumentFacade df = AppFacade.getDocumentFacade();
    private AuthFacade af = AppFacade.getAuthFacade();

    @Override
    protected Object doAction(Object arg, IResource resource) throws ServiceException, BaseException {
        try {
            int appid = af.getAppId();
            DPair p = df.convertToPair(appid, arg);
            DocMeta meta = df.getDocMetaByDocid(p.getAppid(), p.getDocid());
            af.checkPermission(meta);
            PdfItem item = pf.getPdfItem(p);
            GridFSDBFile gfile = pf.getPdfFile(item);
            writePdfContentToResponse(gfile, getRequest(), getResponse());
        } catch (BaseException e) {
            exceptionHandler(e);
        }
        return TakeOver.NO_MESSAGE;
    }

    private void writePdfContentToResponse(GridFSDBFile dbfile, HttpServletRequest request,
            HttpServletResponse response) {
        OutputStream os = null;
        try {
            response.setContentLength((int) dbfile.getLength());
            response.setContentType("application/x-download");
            String filename = dbfile.getFilename();
            String headerValue = ResponseHeaderUtils.buildResponseHeader(request, filename, true);
            response.setHeader("Content-Disposition", headerValue);
            response.setHeader("Content-Length", dbfile.getLength() + "");
            os = response.getOutputStream();
            dbfile.writeTo(os);
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (os != null) {
                IOUtils.closeQuietly(os);
            }
        }
    }
}