//
// ========================================================================
// Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
//
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
//
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
//
package org.eclipse.jetty.websocket.common;
import java.nio.ByteBuffer;
import java.util.Arrays;
import org.eclipse.jetty.util.BufferUtil;
import org.eclipse.jetty.websocket.api.extensions.Frame;
import org.eclipse.jetty.websocket.common.frames.BinaryFrame;
import org.eclipse.jetty.websocket.common.frames.CloseFrame;
import org.eclipse.jetty.websocket.common.frames.ContinuationFrame;
import org.eclipse.jetty.websocket.common.frames.PingFrame;
import org.eclipse.jetty.websocket.common.frames.PongFrame;
import org.eclipse.jetty.websocket.common.frames.TextFrame;
/**
* A Base Frame as seen in <a href="https://tools.ietf.org/html/rfc6455#section-5.2">RFC 6455. Sec 5.2</a>
*
* <pre>
* 0 1 2 3
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
* +-+-+-+-+-------+-+-------------+-------------------------------+
* |F|R|R|R| opcode|M| Payload len | Extended payload length |
* |I|S|S|S| (4) |A| (7) | (16/64) |
* |N|V|V|V| |S| | (if payload len==126/127) |
* | |1|2|3| |K| | |
* +-+-+-+-+-------+-+-------------+ - - - - - - - - - - - - - - - +
* | Extended payload length continued, if payload len == 127 |
* + - - - - - - - - - - - - - - - +-------------------------------+
* | |Masking-key, if MASK set to 1 |
* +-------------------------------+-------------------------------+
* | Masking-key (continued) | Payload Data |
* +-------------------------------- - - - - - - - - - - - - - - - +
* : Payload Data continued ... :
* + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - +
* | Payload Data continued ... |
* +---------------------------------------------------------------+
* </pre>
*/
public abstract class WebSocketFrame implements Frame
{
public static WebSocketFrame copy(Frame original)
{
WebSocketFrame copy;
switch (original.getOpCode())
{
case OpCode.BINARY:
copy = new BinaryFrame();
break;
case OpCode.TEXT:
copy = new TextFrame();
break;
case OpCode.CLOSE:
copy = new CloseFrame();
break;
case OpCode.CONTINUATION:
copy = new ContinuationFrame();
break;
case OpCode.PING:
copy = new PingFrame();
break;
case OpCode.PONG:
copy = new PongFrame();
break;
default:
throw new IllegalArgumentException("Cannot copy frame with opcode " + original.getOpCode() + " - " + original);
}
copy.copyHeaders(original);
ByteBuffer payload = original.getPayload();
if (payload != null)
{
ByteBuffer payloadCopy = ByteBuffer.allocate(payload.remaining());
payloadCopy.put(payload.slice()).flip();
copy.setPayload(payloadCopy);
}
return copy;
}
/**
* Combined FIN + RSV1 + RSV2 + RSV3 + OpCode byte.
* <p>
*
* <pre>
* 1000_0000 (0x80) = fin
* 0100_0000 (0x40) = rsv1
* 0010_0000 (0x20) = rsv2
* 0001_0000 (0x10) = rsv3
* 0000_1111 (0x0F) = opcode
* </pre>
*/
protected byte finRsvOp;
protected boolean masked = false;
protected byte mask[];
/**
* The payload data.
* <p>
* It is assumed to always be in FLUSH mode (ready to read) in this object.
*/
protected ByteBuffer data;
/**
* Construct form opcode
*/
protected WebSocketFrame(byte opcode)
{
reset();
setOpCode(opcode);
}
public abstract void assertValid();
protected void copyHeaders(Frame frame)
{
finRsvOp = 0x00;
finRsvOp |= frame.isFin()?0x80:0x00;
finRsvOp |= frame.isRsv1()?0x40:0x00;
finRsvOp |= frame.isRsv2()?0x20:0x00;
finRsvOp |= frame.isRsv3()?0x10:0x00;
finRsvOp |= frame.getOpCode() & 0x0F;
masked = frame.isMasked();
if (masked)
{
mask = frame.getMask();
}
else
{
mask = null;
}
}
protected void copyHeaders(WebSocketFrame copy)
{
finRsvOp = copy.finRsvOp;
masked = copy.masked;
mask = null;
if (copy.mask != null)
mask = Arrays.copyOf(copy.mask, copy.mask.length);
}
@Override
public boolean equals(Object obj)
{
if (this == obj)
{
return true;
}
if (obj == null)
{
return false;
}
if (getClass() != obj.getClass())
{
return false;
}
WebSocketFrame other = (WebSocketFrame)obj;
if (data == null)
{
if (other.data != null)
{
return false;
}
}
else if (!data.equals(other.data))
{
return false;
}
if (finRsvOp != other.finRsvOp)
{
return false;
}
if (!Arrays.equals(mask,other.mask))
{
return false;
}
if (masked != other.masked)
{
return false;
}
return true;
}
@Override
public byte[] getMask()
{
return mask;
}
@Override
public final byte getOpCode()
{
return (byte)(finRsvOp & 0x0F);
}
/**
* Get the payload ByteBuffer. possible null.
*/
@Override
public ByteBuffer getPayload()
{
return data;
}
public String getPayloadAsUTF8()
{
return BufferUtil.toUTF8String(getPayload());
}
@Override
public int getPayloadLength()
{
if (data == null)
{
return 0;
}
return data.remaining();
}
@Override
public Type getType()
{
return Type.from(getOpCode());
}
@Override
public int hashCode()
{
final int prime = 31;
int result = 1;
result = (prime * result) + ((data == null)?0:data.hashCode());
result = (prime * result) + finRsvOp;
result = (prime * result) + Arrays.hashCode(mask);
return result;
}
@Override
public boolean hasPayload()
{
return ((data != null) && data.hasRemaining());
}
public abstract boolean isControlFrame();
public abstract boolean isDataFrame();
@Override
public boolean isFin()
{
return (byte)(finRsvOp & 0x80) != 0;
}
@Override
public boolean isLast()
{
return isFin();
}
@Override
public boolean isMasked()
{
return masked;
}
@Override
public boolean isRsv1()
{
return (byte)(finRsvOp & 0x40) != 0;
}
@Override
public boolean isRsv2()
{
return (byte)(finRsvOp & 0x20) != 0;
}
@Override
public boolean isRsv3()
{
return (byte)(finRsvOp & 0x10) != 0;
}
public void reset()
{
finRsvOp = (byte)0x80; // FIN (!RSV, opcode 0)
masked = false;
data = null;
mask = null;
}
public WebSocketFrame setFin(boolean fin)
{
// set bit 1
this.finRsvOp = (byte)((finRsvOp & 0x7F) | (fin?0x80:0x00));
return this;
}
public Frame setMask(byte[] maskingKey)
{
this.mask = maskingKey;
this.masked = (mask != null);
return this;
}
public Frame setMasked(boolean mask)
{
this.masked = mask;
return this;
}
protected WebSocketFrame setOpCode(byte op)
{
this.finRsvOp = (byte)((finRsvOp & 0xF0) | (op & 0x0F));
return this;
}
/**
* Set the data payload.
* <p>
* The provided buffer will be used as is, no copying of bytes performed.
* <p>
* The provided buffer should be flipped and ready to READ from.
*
* @param buf
* the bytebuffer to set
*/
public WebSocketFrame setPayload(ByteBuffer buf)
{
data = buf;
return this;
}
public WebSocketFrame setRsv1(boolean rsv1)
{
// set bit 2
this.finRsvOp = (byte)((finRsvOp & 0xBF) | (rsv1?0x40:0x00));
return this;
}
public WebSocketFrame setRsv2(boolean rsv2)
{
// set bit 3
this.finRsvOp = (byte)((finRsvOp & 0xDF) | (rsv2?0x20:0x00));
return this;
}
public WebSocketFrame setRsv3(boolean rsv3)
{
// set bit 4
this.finRsvOp = (byte)((finRsvOp & 0xEF) | (rsv3?0x10:0x00));
return this;
}
@Override
public String toString()
{
StringBuilder b = new StringBuilder();
b.append(OpCode.name((byte)(finRsvOp & 0x0F)));
b.append('[');
b.append("len=").append(getPayloadLength());
b.append(",fin=").append((finRsvOp & 0x80) != 0);
b.append(",rsv=");
b.append(((finRsvOp & 0x40) != 0)?'1':'.');
b.append(((finRsvOp & 0x20) != 0)?'1':'.');
b.append(((finRsvOp & 0x10) != 0)?'1':'.');
b.append(",masked=").append(masked);
b.append(']');
return b.toString();
}
}