DownloadServlet.java

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/*
 * Turró i Cutiller Foundation. License notice.
 * Copyright (C) 2011 Lluis Turró Cutiller <http://www.turro.org/>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.turro.elephant.download;
 
import java.io.IOException;
import java.net.URISyntaxException;
import java.net.URLDecoder;
import java.nio.charset.StandardCharsets;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.hc.core5.http.HttpStatus;
import org.turro.collections.KeyValueMap;
import org.turro.elephant.context.Application;
import org.turro.elephant.context.ElephantApplication;
import org.turro.elephant.context.ElephantContext;
import org.turro.file.Document;
import org.turro.file.Folder;
import org.turro.http.Respond;
import org.turro.log.SystemLogger;
import org.turro.log.WebLoggers;
 
@WebServlet(name = "Download", urlPatterns = {"/down_/*"})
public class DownloadServlet extends HttpServlet {
  
  private void processDownload(Application application, String path, KeyValueMap map) throws IOException {
    HttpServletResponse response = application.getHttpServletResponse();
    try {
      processResource(application, path, response);
    } catch (URISyntaxException ex) {
      WebLoggers.severe(this).exception(ex).log();
    }
  }
 
  private void processResource(Application application, String path, HttpServletResponse response) throws IOException, URISyntaxException {
    if(path.contains("/WEB-INF") && !application.isInRole("download:app")) {
      response.setStatus(HttpStatus.SC_FORBIDDEN);
      return;
    } else {
      Document doc = Document.from(ElephantContext.getRealPath(path));
      if(doc.exists()) {
        Respond.to(response).flush(doc.document());
        SystemLogger.info().entityPath("/file" + path).entityName(doc.name()).comment("downloaded").log();
      } else {
        Folder folder = Folder.from(ElephantContext.getRealPath(path));
        if(folder.exists()) {
          Respond.to(response).flush(ElephantContext.toUri(ElephantContext.getRelativePath(folder.path().toString())).toURL());
        }
      }
    }
  }
 
  protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    KeyValueMap map = new KeyValueMap();
    for(String key : request.getParameterMap().keySet()) {
      map.put(key, URLDecoder.decode(request.getParameter(key), StandardCharsets.UTF_8));
    }
    processDownload(new ElephantApplication(request, response), request.getPathInfo(), map);
  }
  
  @Override
  protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    processRequest(request, response);
  }
  
  @Override
  protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    processRequest(request, response);
  }
  
  @Override
  public String getServletInfo() {
    return "Download servlet";
  }
 
}