/**
 * Logback: the reliable, generic, fast and flexible logging framework.
 * Copyright (C) 1999-2015, QOS.ch. All rights reserved.
 *
 * This program and the accompanying materials are dual-licensed under
 * either the terms of the Eclipse Public License v1.0 as published by
 * the Eclipse Foundation
 *
 *   or (per the licensee's choosing)
 *
 * under the terms of the GNU Lesser General Public License version 2.1
 * as published by the Free Software Foundation.
 */
package ch.qos.logback.access.servlet;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;

import static ch.qos.logback.access.AccessConstants.LB_INPUT_BUFFER;
/**
 * As the "tee" program on Unix, duplicate the request's input stream.
 *
 * @author Ceki G&uuml;lc&uuml;
 */
class TeeHttpServletRequest extends HttpServletRequestWrapper {

  private TeeServletInputStream inStream;
  private BufferedReader reader;
  boolean postedParametersMode = false;

  TeeHttpServletRequest(HttpServletRequest request) {
    super(request);
    // we can't access the input stream and access the request parameters
    // at the same time
    if (Util.isFormUrlEncoded(request)) {
      postedParametersMode = true;
    } else {
      inStream = new TeeServletInputStream(request);
      // add the contents of the input buffer as an attribute of the request
      request.setAttribute(LB_INPUT_BUFFER, inStream.getInputBuffer());
      reader = new BufferedReader(new InputStreamReader(inStream));
    }

  }

  byte[] getInputBuffer() {
    if (postedParametersMode) {
      throw new IllegalStateException("Call disallowed in postedParametersMode");
    }
    return inStream.getInputBuffer();
  }

  @Override
  public ServletInputStream getInputStream() throws IOException {
    if (!postedParametersMode) {
      return inStream;
    } else {
      return super.getInputStream();
    }
  }

  //

  @Override
  public BufferedReader getReader() throws IOException {
    if (!postedParametersMode) {
      return reader;
    } else {
      return super.getReader();
    }
  }

  public boolean isPostedParametersMode() {
    return postedParametersMode;
  }

}
