package org.apache.blur.gui;

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;

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

import org.apache.commons.io.IOUtils;

@SuppressWarnings("serial")
public class LogServlet extends HttpServlet {

  private final String _dir;

  public LogServlet(String dir) {
    _dir = dir;
  }

  protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    String filename = request.getParameter("file");
    response.setContentType("text/plain");
    response.setHeader("Content-disposition", "attachment; filename=" + filename);
    if (filename.contains("/")) {
      throw new IOException("Filename [" + filename + "] with '/' is not allowed.");
    }
    File file = new File(new File(_dir), filename);
    if (!file.exists()) {
      throw new IOException("Filename [" + filename + "] doe snot exist.");
    }
    FileInputStream input = new FileInputStream(file);
    ServletOutputStream outputStream = response.getOutputStream();
    IOUtils.copy(input, outputStream);
    input.close();
    outputStream.flush();
  }

}