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/*
* 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.
*/
package org.apache.catalina.websocket;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.CharsetEncoder;
import java.nio.charset.CoderResult;
import org.apache.coyote.http11.upgrade.UpgradeOutbound;
import org.apache.tomcat.util.buf.B2CConverter;
import org.apache.tomcat.util.res.StringManager;
/**
* Provides the means to write WebSocket messages to the client. All methods
* that write to the client (or update a buffer that is later written to the
* client) are synchronized to prevent multiple threads trying to write to the
* client at the same time.
*/
public class WsOutbound {
private static final StringManager sm =
StringManager.getManager(Constants.Package);
public static final int DEFAULT_BUFFER_SIZE = 8192;
private UpgradeOutbound upgradeOutbound;
private StreamInbound streamInbound;
private ByteBuffer bb;
private CharBuffer cb;
private boolean closed = false;
private Boolean text = null;
private boolean firstFrame = true;
public WsOutbound(UpgradeOutbound upgradeOutbound,
StreamInbound streamInbound) {
this(upgradeOutbound, streamInbound, DEFAULT_BUFFER_SIZE,
DEFAULT_BUFFER_SIZE);
}
public WsOutbound(UpgradeOutbound upgradeOutbound, StreamInbound streamInbound,
int byteBufferSize, int charBufferSize) {
this.upgradeOutbound = upgradeOutbound;
this.streamInbound = streamInbound;
this.bb = ByteBuffer.allocate(byteBufferSize);
this.cb = CharBuffer.allocate(charBufferSize);
}
/**
* Adds the data to the buffer for binary data. If a textual message is
* currently in progress that message will be completed and a new binary
* message started. If the buffer for binary data is full, the buffer will
* be flushed and a new binary continuation fragment started.
*
* @param b The byte (only the least significant byte is used) of data to
* send to the client.
*
* @throws IOException If a flush is required and an error occurs writing
* the WebSocket frame to the client
*/
public synchronized void writeBinaryData(int b) throws IOException {
if (closed) {
throw new IOException(sm.getString("outbound.closed"));
}
if (bb.position() == bb.capacity()) {
doFlush(false);
}
if (text == null) {
text = Boolean.FALSE;
} else if (text == Boolean.TRUE) {
// Flush the character data
flush();
text = Boolean.FALSE;
}
bb.put((byte) (b & 0xFF));
}
/**
* Adds the data to the buffer for textual data. If a binary message is
* currently in progress that message will be completed and a new textual
* message started. If the buffer for textual data is full, the buffer will
* be flushed and a new textual continuation fragment started.
*
* @param c The character to send to the client.
*
* @throws IOException If a flush is required and an error occurs writing
* the WebSocket frame to the client
*/
public synchronized void writeTextData(char c) throws IOException {
if (closed) {
throw new IOException(sm.getString("outbound.closed"));
}
if (cb.position() == cb.capacity()) {
doFlush(false);
}
if (text == null) {
text = Boolean.TRUE;
} else if (text == Boolean.FALSE) {
// Flush the binary data
flush();
text = Boolean.TRUE;
}
cb.append(c);
}
/**
* Flush any message (binary or textual) that may be buffered and then send
* a WebSocket binary message as a single frame with the provided buffer as
* the payload of the message.
*
* @param msgBb The buffer containing the payload
*
* @throws IOException If an error occurs writing to the client
*/
public synchronized void writeBinaryMessage(ByteBuffer msgBb)
throws IOException {
if (closed) {
throw new IOException(sm.getString("outbound.closed"));
}
if (text != null) {
// Empty the buffer
flush();
}
text = Boolean.FALSE;
doWriteBytes(msgBb, true);
}
/**
* Flush any message (binary or textual) that may be buffered and then send
* a WebSocket text message as a single frame with the provided buffer as
* the payload of the message.
*
* @param msgCb The buffer containing the payload
*
* @throws IOException If an error occurs writing to the client
*/
public synchronized void writeTextMessage(CharBuffer msgCb)
throws IOException {
if (closed) {
throw new IOException(sm.getString("outbound.closed"));
}
if (text != null) {
// Empty the buffer
flush();
}
text = Boolean.TRUE;
doWriteText(msgCb, true);
}
/**
* Flush any message (binary or textual) that may be buffered.
*
* @throws IOException If an error occurs writing to the client
*/
public synchronized void flush() throws IOException {
if (closed) {
throw new IOException(sm.getString("outbound.closed"));
}
doFlush(true);
}
private void doFlush(boolean finalFragment) throws IOException {
if (text == null) {
// No data
return;
}
if (text.booleanValue()) {
cb.flip();
doWriteText(cb, finalFragment);
} else {
bb.flip();
doWriteBytes(bb, finalFragment);
}
}
/**
* Respond to a client close by sending a close that echoes the status code
* and message.
*
* @param frame The close frame received from a client
*
* @throws IOException If an error occurs writing to the client
*/
protected void close(WsFrame frame) throws IOException {
if (frame.getPayLoadLength() > 0) {
// Must be status (2 bytes) plus optional message
if (frame.getPayLoadLength() == 1) {
throw new IOException();
}
int status = (frame.getPayLoad().get() & 0xFF) << 8;
status += frame.getPayLoad().get() & 0xFF;
if (validateCloseStatus(status)) {
// Echo the status back to the client
close(status, frame.getPayLoad());
} else {
// Invalid close code
close(Constants.STATUS_PROTOCOL_ERROR, null);
}
} else {
// No status
close(0, null);
}
}
private boolean validateCloseStatus(int status) {
if (status == Constants.STATUS_CLOSE_NORMAL ||
status == Constants.STATUS_SHUTDOWN ||
status == Constants.STATUS_PROTOCOL_ERROR ||
status == Constants.STATUS_UNEXPECTED_DATA_TYPE ||
status == Constants.STATUS_BAD_DATA ||
status == Constants.STATUS_POLICY_VIOLATION ||
status == Constants.STATUS_MESSAGE_TOO_LARGE ||
status == Constants.STATUS_REQUIRED_EXTENSION ||
status == Constants.STATUS_UNEXPECTED_CONDITION ||
(status > 2999 && status < 5000)) {
// Other 1xxx reserved / not permitted
// 2xxx reserved
// 3xxx framework defined
// 4xxx application defined
return true;
}
// <1000 unused
// >4999 undefined
return false;
}
/**
* Send a close message to the client
*
* @param status Must be a valid status code or zero to send no code
* @param data Optional message. If message is defined, a valid status
* code must be provided.
*
* @throws IOException If an error occurs writing to the client
*/
public synchronized void close(int status, ByteBuffer data)
throws IOException {
if (closed) {
return;
}
// Send any partial data we have
try {
doFlush(false);
} finally {
closed = true;
}
upgradeOutbound.write(0x88);
if (status == 0) {
upgradeOutbound.write(0);
} else if (data == null || data.position() == data.limit()) {
upgradeOutbound.write(2);
upgradeOutbound.write(status >>> 8);
upgradeOutbound.write(status);
} else {
upgradeOutbound.write(2 + data.limit() - data.position());
upgradeOutbound.write(status >>> 8);
upgradeOutbound.write(status);
upgradeOutbound.write(data.array(), data.position(),
data.limit() - data.position());
}
upgradeOutbound.flush();
bb = null;
cb = null;
upgradeOutbound = null;
}
/**
* Send a pong message to the client
*
* @param data Optional message.
*
* @throws IOException If an error occurs writing to the client
*/
public synchronized void pong(ByteBuffer data) throws IOException {
sendControlMessage(data, Constants.OPCODE_PONG);
}
/**
* Send a ping message to the client
*
* @param data Optional message.
*
* @throws IOException If an error occurs writing to the client
*/
public synchronized void ping(ByteBuffer data) throws IOException {
sendControlMessage(data, Constants.OPCODE_PING);
}
/**
* Generic function to send either a ping or a pong.
*
* @param data Optional message.
* @param opcode The byte to include as the opcode.
*
* @throws IOException If an error occurs writing to the client
*/
private synchronized void sendControlMessage(ByteBuffer data, byte opcode) throws IOException {
if (closed) {
throw new IOException(sm.getString("outbound.closed"));
}
doFlush(false);
upgradeOutbound.write(0x80 | opcode);
if (data == null) {
upgradeOutbound.write(0);
} else {
upgradeOutbound.write(data.limit() - data.position());
upgradeOutbound.write(data.array(), data.position(),
data.limit() - data.position());
}
upgradeOutbound.flush();
}
/**
* Writes the provided bytes as the payload in a new WebSocket frame.
*
* @param buffer The bytes to include in the payload.
* @param finalFragment Do these bytes represent the final fragment of a
* WebSocket message?
* @throws IOException
*/
private void doWriteBytes(ByteBuffer buffer, boolean finalFragment)
throws IOException {
if (closed) {
throw new IOException(sm.getString("outbound.closed"));
}
try {
// Work out the first byte
int first = 0x00;
if (finalFragment) {
first = first + 0x80;
}
if (firstFrame) {
if (text.booleanValue()) {
first = first + 0x1;
} else {
first = first + 0x2;
}
}
// Continuation frame is OpCode 0
upgradeOutbound.write(first);
if (buffer.limit() < 126) {
upgradeOutbound.write(buffer.limit());
} else if (buffer.limit() < 65536) {
upgradeOutbound.write(126);
upgradeOutbound.write(buffer.limit() >>> 8);
upgradeOutbound.write(buffer.limit() & 0xFF);
} else {
// Will never be more than 2^31-1
upgradeOutbound.write(127);
upgradeOutbound.write(0);
upgradeOutbound.write(0);
upgradeOutbound.write(0);
upgradeOutbound.write(0);
upgradeOutbound.write(buffer.limit() >>> 24);
upgradeOutbound.write(buffer.limit() >>> 16);
upgradeOutbound.write(buffer.limit() >>> 8);
upgradeOutbound.write(buffer.limit() & 0xFF);
}
// Write the content
upgradeOutbound.write(buffer.array(), buffer.arrayOffset(),
buffer.limit());
upgradeOutbound.flush();
// Reset
if (finalFragment) {
text = null;
firstFrame = true;
} else {
firstFrame = false;
}
bb.clear();
} catch (IOException ioe) {
// Any IOException is terminal. Make sure the Inbound side knows
// that something went wrong.
streamInbound.doOnClose(Constants.STATUS_CLOSED_UNEXPECTEDLY);
throw ioe;
}
}
/*
* Convert the textual message to bytes and then output it.
*/
private void doWriteText(CharBuffer buffer, boolean finalFragment)
throws IOException {
CharsetEncoder encoder = B2CConverter.UTF_8.newEncoder();
do {
CoderResult cr = encoder.encode(buffer, bb, true);
if (cr.isError()) {
cr.throwException();
}
bb.flip();
if (buffer.hasRemaining()) {
doWriteBytes(bb, false);
} else {
doWriteBytes(bb, finalFragment);
}
} while (buffer.hasRemaining());
// Reset - bb will be cleared in doWriteBytes()
cb.clear();
}
}
