/*
 * Copyright (c) 2002-2018 ymnk, JCraft,Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are permitted
 * provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this list of conditions
 * and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice, this list of
 * conditions and the following disclaimer in the documentation and/or other materials provided with
 * the distribution.
 *
 * 3. The names of the authors may not be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL JCRAFT, INC. OR ANY CONTRIBUTORS TO THIS SOFTWARE BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package com.jcraft.jsch;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;

public class ProxyHTTP implements Proxy {
  private static int DEFAULTPORT = 80;
  private String proxy_host;
  private int proxy_port;
  private InputStream in;
  private OutputStream out;
  private Socket socket;

  private String user;
  private String passwd;

  public ProxyHTTP(String proxy_host) {
    int port = DEFAULTPORT;
    String host = proxy_host;
    if (proxy_host.indexOf(':') != -1) {
      try {
        host = proxy_host.substring(0, proxy_host.indexOf(':'));
        port = Integer.parseInt(proxy_host.substring(proxy_host.indexOf(':') + 1));
      } catch (Exception e) {
      }
    }
    this.proxy_host = host;
    this.proxy_port = port;
  }

  public ProxyHTTP(String proxy_host, int proxy_port) {
    this.proxy_host = proxy_host;
    this.proxy_port = proxy_port;
  }

  public void setUserPasswd(String user, String passwd) {
    this.user = user;
    this.passwd = passwd;
  }

  @Override
  public void connect(SocketFactory socket_factory, String host, int port, int timeout)
      throws JSchException {
    try {
      if (socket_factory == null) {
        socket = Util.createSocket(proxy_host, proxy_port, timeout);
        in = socket.getInputStream();
        out = socket.getOutputStream();
      } else {
        socket = socket_factory.createSocket(proxy_host, proxy_port);
        in = socket_factory.getInputStream(socket);
        out = socket_factory.getOutputStream(socket);
      }
      if (timeout > 0) {
        socket.setSoTimeout(timeout);
      }
      socket.setTcpNoDelay(true);

      out.write(Util.str2byte("CONNECT " + host + ":" + port + " HTTP/1.0\r\n"));

      if (user != null && passwd != null) {
        byte[] code = Util.str2byte(user + ":" + passwd);
        code = Util.toBase64(code, 0, code.length, true);
        out.write(Util.str2byte("Proxy-Authorization: Basic "));
        out.write(code);
        out.write(Util.str2byte("\r\n"));
      }

      out.write(Util.str2byte("\r\n"));
      out.flush();

      int foo = 0;

      StringBuilder sb = new StringBuilder();
      while (foo >= 0) {
        foo = in.read();
        if (foo != 13) {
          sb.append((char) foo);
          continue;
        }
        foo = in.read();
        if (foo != 10) {
          continue;
        }
        break;
      }
      if (foo < 0) {
        throw new IOException();
      }

      String response = sb.toString();
      String reason = "Unknow reason";
      int code = -1;
      try {
        foo = response.indexOf(' ');
        int bar = response.indexOf(' ', foo + 1);
        code = Integer.parseInt(response.substring(foo + 1, bar));
        reason = response.substring(bar + 1);
      } catch (Exception e) {
      }
      if (code != 200) {
        throw new IOException("proxy error: " + reason);
      }

      /*
      while (foo >= 0) {
        foo = in.read();  if (foo != 13) continue;
        foo = in.read();  if (foo != 10) continue;
        foo = in.read();  if (foo != 13) continue;
        foo = in.read();  if (foo != 10) continue;
        break;
      }
      */

      int count = 0;
      while (true) {
        count = 0;
        while (foo >= 0) {
          foo = in.read();
          if (foo != 13) {
            count++;
            continue;
          }
          foo = in.read();
          if (foo != 10) {
            continue;
          }
          break;
        }
        if (foo < 0) {
          throw new IOException();
        }
        if (count == 0)
          break;
      }
    } catch (RuntimeException e) {
      throw e;
    } catch (Exception e) {
      try {
        if (socket != null)
          socket.close();
      } catch (Exception eee) {
      }
      String message = "ProxyHTTP: " + e.toString();
      throw new JSchProxyException(message, e);
    }
  }

  @Override
  public InputStream getInputStream() {
    return in;
  }

  @Override
  public OutputStream getOutputStream() {
    return out;
  }

  @Override
  public Socket getSocket() {
    return socket;
  }

  @Override
  public void close() {
    try {
      if (in != null)
        in.close();
      if (out != null)
        out.close();
      if (socket != null)
        socket.close();
    } catch (Exception e) {
    }
    in = null;
    out = null;
    socket = null;
  }

  public static int getDefaultPort() {
    return DEFAULTPORT;
  }
}
