/*
 * Copyright (c) 1998-2006 Caucho Technology -- all rights reserved
 *
 * This file is part of Resin(R) Open Source
 *
 * Each copy or derived work must preserve the copyright notice and this
 * notice unmodified.
 *
 * Resin Open Source is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * Resin Open Source 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, or any warranty
 * of NON-INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Resin Open Source; if not, write to the
 *   Free SoftwareFoundation, Inc.
 *   59 Temple Place, Suite 330
 *   Boston, MA 02111-1307  USA
 *
 * @author Scott Ferguson
 */

package com.caucho.vfs;

import java.io.*;
import java.net.*;
import java.util.*;

import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSocketFactory;
import java.security.NoSuchAlgorithmException;

import com.caucho.util.*;
import com.caucho.vfs.*;

/**
 * Implementation of a TCP stream.  Mostly this just forwards the
 * request to the underlying socket streams.
 */
class TcpStream extends StreamImpl {
  private Socket _s;
  private InputStream _is;
  private OutputStream _os;

  private TcpStream(TcpPath path, long timeout) throws IOException
  {
    setPath(path);

    //_s = new Socket(path.getHost(), path.getPort());
    _s = new Socket();
    if (timeout > 0)
      _s.connect(path.getSocketAddress(), (int) timeout);
    else
      _s.connect(path.getSocketAddress());

    if (! _s.isConnected())
      throw new IOException("connection timeout");

    try {
      if (path instanceof TcpsPath) {
	SSLContext context = SSLContext.getInstance("TLS");

	javax.net.ssl.TrustManager tm =
	  new javax.net.ssl.X509TrustManager() {
	    public java.security.cert.X509Certificate[]
	      getAcceptedIssuers() {
	      return null;
	    }
	    public void checkClientTrusted(
					   java.security.cert.X509Certificate[] cert, String foo) {
	    }
	    public void checkServerTrusted(
					   java.security.cert.X509Certificate[] cert, String foo) {
	    }
	  };

      
	context.init(null, new javax.net.ssl.TrustManager[] { tm }, null);
	SSLSocketFactory factory = context.getSocketFactory();

	_s = factory.createSocket(_s, path.getHost(), path.getPort(), true);
      }
    } catch (IOException e) {
      throw e;
    } catch (RuntimeException e) {
      throw e;
    } catch (Exception e) {
      throw new IOExceptionWrapper(e);
    }
    
    _is = _s.getInputStream();
    _os = _s.getOutputStream();
  }

  public void setAttribute(String name, Object value)
  {
    if (name.equals("timeout")) {
      try {
	if (value instanceof Number)
	  _s.setSoTimeout(((Number) value).intValue());
	else
	  _s.setSoTimeout(Integer.parseInt(String.valueOf(value)));
      } catch (SocketException e) {
      }
    }
  }

  static TcpStream openRead(TcpPath path, long timeout) throws IOException
  {
    return new TcpStream(path, timeout);
  }

  static TcpStream openReadWrite(TcpPath path, long timeout) throws IOException
  {
    return new TcpStream(path, timeout);
  }

  public boolean canWrite()
  {
    return _os != null;
  }
  
  /**
   * Writes a buffer to the underlying stream.
   *
   * @param buffer the byte array to write.
   * @param offset the offset into the byte array.
   * @param length the number of bytes to write.
   * @param isEnd true when the write is flushing a close.
   */
  public void write(byte []buf, int offset, int length, boolean isEnd)
    throws IOException
  {
    if (_os != null)
      _os.write(buf, offset, length);
  }

  public boolean canRead()
  {
    return _is != null;
  }

  public int getAvailable() throws IOException
  {
    if (_is != null)
      return _is.available();
    else
      return -1;
  }

  public int read(byte []buf, int offset, int length) throws IOException
  {
    if (_is != null)
      return _is.read(buf, offset, length);
    else
      return -1;
  }

  public void closeWrite() throws IOException
  {
    OutputStream os = _os;
    _os = null;
    
    try {
      if (os != null)
        _s.shutdownOutput();
    } finally {
      if (_is == null) {
        Socket s = _s;
        _s = null;
        
        if (s != null)
          s.close();
      }
    }
  }

  public void close() throws IOException
  {
    InputStream is = _is;
    _is = null;
    
    OutputStream os = _os;
    _os = null;
    
    Socket s = _s;
    _s = null;

    try {
      if (os != null)
	os.close();

      if (is != null)
	is.close();
    } finally {
      if (s != null)
	s.close();
    }
  }
}
