diff options
Diffstat (limited to 'websocket/src/main/java/fi/iki/elonen/NanoWebSocketServer.java')
| -rw-r--r-- | websocket/src/main/java/fi/iki/elonen/NanoWebSocketServer.java | 767 |
1 files changed, 749 insertions, 18 deletions
diff --git a/websocket/src/main/java/fi/iki/elonen/NanoWebSocketServer.java b/websocket/src/main/java/fi/iki/elonen/NanoWebSocketServer.java index 85e2a8b..3f1e1f4 100644 --- a/websocket/src/main/java/fi/iki/elonen/NanoWebSocketServer.java +++ b/websocket/src/main/java/fi/iki/elonen/NanoWebSocketServer.java @@ -33,40 +33,771 @@ package fi.iki.elonen; * #L% */ +import java.io.EOFException; +import java.io.IOException; +import java.io.InputStream; +import java.io.OutputStream; +import java.nio.charset.CharacterCodingException; +import java.nio.charset.Charset; +import java.security.MessageDigest; +import java.security.NoSuchAlgorithmException; +import java.util.Arrays; +import java.util.LinkedList; +import java.util.List; +import java.util.Map; -public class NanoWebSocketServer extends NanoHTTPD implements IWebSocketFactory { - public static final String MISSING_FACTORY_MESSAGE = "You must either override this method or supply a WebSocketFactory in the constructor"; - - private final WebSocketResponseHandler responseHandler; +import fi.iki.elonen.NanoWebSocketServer.WebSocketFrame.CloseCode; +import fi.iki.elonen.NanoWebSocketServer.WebSocketFrame.CloseFrame; +import fi.iki.elonen.NanoWebSocketServer.WebSocketFrame.OpCode; +public abstract class NanoWebSocketServer extends NanoHTTPD { + public static final String HEADER_UPGRADE = "upgrade"; + public static final String HEADER_UPGRADE_VALUE = "websocket"; + public static final String HEADER_CONNECTION = "connection"; + public static final String HEADER_CONNECTION_VALUE = "Upgrade"; + public static final String HEADER_WEBSOCKET_VERSION = "sec-websocket-version"; + public static final String HEADER_WEBSOCKET_VERSION_VALUE = "13"; + public static final String HEADER_WEBSOCKET_KEY = "sec-websocket-key"; + public static final String HEADER_WEBSOCKET_ACCEPT = "sec-websocket-accept"; + public static final String HEADER_WEBSOCKET_PROTOCOL = "sec-websocket-protocol"; + + private final static String WEBSOCKET_KEY_MAGIC = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"; + public NanoWebSocketServer(int port) { super(port); - responseHandler = new WebSocketResponseHandler(this); } public NanoWebSocketServer(String hostname, int port) { super(hostname, port); - responseHandler = new WebSocketResponseHandler(this); } - public NanoWebSocketServer(int port, IWebSocketFactory webSocketFactory) { - super(port); - responseHandler = new WebSocketResponseHandler(webSocketFactory); - } + @Override + public Response serve(final IHTTPSession session) { + Map<String, String> headers = session.getHeaders(); + if (isWebsocketRequested(session)) { + if (!HEADER_WEBSOCKET_VERSION_VALUE.equalsIgnoreCase(headers.get(HEADER_WEBSOCKET_VERSION))) { + return new Response(Response.Status.BAD_REQUEST, NanoHTTPD.MIME_PLAINTEXT, + "Invalid Websocket-Version " + headers.get(HEADER_WEBSOCKET_VERSION)); + } - public NanoWebSocketServer(String hostname, int port, IWebSocketFactory webSocketFactory) { - super(hostname, port); - responseHandler = new WebSocketResponseHandler(webSocketFactory); + if (!headers.containsKey(HEADER_WEBSOCKET_KEY)) { + return new Response(Response.Status.BAD_REQUEST, NanoHTTPD.MIME_PLAINTEXT, + "Missing Websocket-Key"); + } + + WebSocket webSocket = openWebSocket(session); + Response handshakeResponse = webSocket.getHandshakeResponse(); + try { + handshakeResponse.addHeader(HEADER_WEBSOCKET_ACCEPT, makeAcceptKey(headers.get(HEADER_WEBSOCKET_KEY))); + } catch (NoSuchAlgorithmException e) { + return new Response(Response.Status.INTERNAL_ERROR, NanoHTTPD.MIME_PLAINTEXT, + "The SHA-1 Algorithm required for websockets is not available on the server."); + } + + if (headers.containsKey(HEADER_WEBSOCKET_PROTOCOL)) { + handshakeResponse.addHeader(HEADER_WEBSOCKET_PROTOCOL, headers.get(HEADER_WEBSOCKET_PROTOCOL).split(",")[0]); + } + + return handshakeResponse; + } else { + return super.serve(session); + } } - @Override - public Response serve(IHTTPSession session) { - Response candidate = responseHandler.serve(session); - return candidate == null ? super.serve(session) : candidate; + protected boolean isWebsocketRequested(IHTTPSession session) { + Map<String, String> headers = session.getHeaders(); + String upgrade = headers.get(HEADER_UPGRADE); + boolean isCorrectConnection = isWebSocketConnectionHeader(headers); + boolean isUpgrade = HEADER_UPGRADE_VALUE.equalsIgnoreCase(upgrade); + return (isUpgrade && isCorrectConnection); } + private boolean isWebSocketConnectionHeader(Map<String, String> headers) { + String connection = headers.get(HEADER_CONNECTION); + return (connection != null && connection.toLowerCase().contains(HEADER_CONNECTION_VALUE.toLowerCase())); + } + public WebSocket openWebSocket(IHTTPSession handshake) { - throw new Error(MISSING_FACTORY_MESSAGE); + return new WebSocket(handshake); + } + + public static String makeAcceptKey(String key) throws NoSuchAlgorithmException { + MessageDigest md = MessageDigest.getInstance("SHA-1"); + String text = key + WEBSOCKET_KEY_MAGIC; + md.update(text.getBytes(), 0, text.length()); + byte[] sha1hash = md.digest(); + return encodeBase64(sha1hash); + } + + private final static char[] ALPHABET = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".toCharArray(); + + /** + * Translates the specified byte array into Base64 string. + * <p> + * Android has android.util.Base64, sun has sun.misc.Base64Encoder, Java 8 hast java.util.Base64, + * I have this from stackoverflow: http://stackoverflow.com/a/4265472 + * </p> + * + * @param buf the byte array (not null) + * @return the translated Base64 string (not null) + */ + private static String encodeBase64(byte[] buf) { + int size = buf.length; + char[] ar = new char[((size + 2) / 3) * 4]; + int a = 0; + int i = 0; + while (i < size) { + byte b0 = buf[i++]; + byte b1 = (i < size) ? buf[i++] : 0; + byte b2 = (i < size) ? buf[i++] : 0; + + int mask = 0x3F; + ar[a++] = ALPHABET[(b0 >> 2) & mask]; + ar[a++] = ALPHABET[((b0 << 4) | ((b1 & 0xFF) >> 4)) & mask]; + ar[a++] = ALPHABET[((b1 << 2) | ((b2 & 0xFF) >> 6)) & mask]; + ar[a++] = ALPHABET[b2 & mask]; + } + switch (size % 3) { + case 1: + ar[--a] = '='; + case 2: + ar[--a] = '='; + } + return new String(ar); + } + + public static enum State { + UNCONNECTED, CONNECTING, OPEN, CLOSING, CLOSED + } + + public class WebSocket { + private InputStream in; + private OutputStream out; + private WebSocketFrame.OpCode continuousOpCode = null; + private List<WebSocketFrame> continuousFrames = new LinkedList<WebSocketFrame>(); + private State state = State.UNCONNECTED; + private final NanoHTTPD.IHTTPSession handshakeRequest; + + private final NanoHTTPD.Response handshakeResponse = new NanoHTTPD.Response( + NanoHTTPD.Response.Status.SWITCH_PROTOCOL, null, (InputStream) null) { + @Override + protected void send(OutputStream out) { + WebSocket.this.out = out; + state = State.CONNECTING; + super.send(out); + state = State.OPEN; + readWebsocket(); + } + }; + + public WebSocket(NanoHTTPD.IHTTPSession handshakeRequest) { + this.handshakeRequest = handshakeRequest; + this.in = handshakeRequest.getInputStream(); + + handshakeResponse.addHeader(HEADER_UPGRADE, HEADER_UPGRADE_VALUE); + handshakeResponse.addHeader(HEADER_CONNECTION, HEADER_CONNECTION_VALUE); + } + + public NanoHTTPD.IHTTPSession getHandshakeRequest() { + return handshakeRequest; + } + + public NanoHTTPD.Response getHandshakeResponse() { + return handshakeResponse; + } + + // --------------------------------IO-------------------------------------- + + private void readWebsocket() { + try { + while (state == State.OPEN) { + handleWebsocketFrame(WebSocketFrame.read(in)); + } + } catch (CharacterCodingException e) { + onException(this, e); + doClose(CloseCode.InvalidFramePayloadData, e.toString(), false); + } catch (IOException e) { + onException(this, e); + if (e instanceof WebSocketException) { + doClose(((WebSocketException) e).getCode(), ((WebSocketException) e).getReason(), false); + } + } finally { + doClose(CloseCode.InternalServerError, "Handler terminated without closing the connection.", false); + } + } + + private void handleWebsocketFrame(WebSocketFrame frame) throws IOException { + onFrameReceived(frame); + if (frame.getOpCode() == OpCode.Close) { + handleCloseFrame(frame); + } else if (frame.getOpCode() == OpCode.Ping) { + sendFrame(new WebSocketFrame(OpCode.Pong, true, frame.getBinaryPayload())); + } else if (frame.getOpCode() == OpCode.Pong) { + onPong(this, frame); + } else if (!frame.isFin() || frame.getOpCode() == OpCode.Continuation) { + handleFrameFragment(frame); + } else if (continuousOpCode != null) { + throw new WebSocketException(CloseCode.ProtocolError, "Continuous frame sequence not completed."); + } else if (frame.getOpCode() == OpCode.Text || frame.getOpCode() == OpCode.Binary) { + onMessage(this, frame); + } else { + throw new WebSocketException(CloseCode.ProtocolError, "Non control or continuous frame expected."); + } + } + + private void handleCloseFrame(WebSocketFrame frame) throws IOException { + CloseCode code = CloseCode.NormalClosure; + String reason = ""; + if (frame instanceof CloseFrame) { + code = ((CloseFrame) frame).getCloseCode(); + reason = ((CloseFrame) frame).getCloseReason(); + } + if (state == State.CLOSING) { + //Answer for my requested close + doClose(code, reason, false); + } else { + //Answer close request from other endpoint and close self + State oldState = state; + state = State.CLOSING; + if (oldState == State.OPEN) { + sendFrame(new CloseFrame(code, reason)); + } + doClose(code, reason, true); + } + } + + private void handleFrameFragment(WebSocketFrame frame) throws IOException { + if (frame.getOpCode() != OpCode.Continuation) { + //First + if (continuousOpCode != null) { + throw new WebSocketException(CloseCode.ProtocolError, "Previous continuous frame sequence not completed."); + } + continuousOpCode = frame.getOpCode(); + continuousFrames.clear(); + continuousFrames.add(frame); + } else if (frame.isFin()) { + //Last + if (continuousOpCode == null) { + throw new WebSocketException(CloseCode.ProtocolError, "Continuous frame sequence was not started."); + } + onMessage(this, new WebSocketFrame(continuousOpCode, continuousFrames)); + continuousOpCode = null; + continuousFrames.clear(); + } else if (continuousOpCode == null) { + //Unexpected + throw new WebSocketException(CloseCode.ProtocolError, "Continuous frame sequence was not started."); + } else { + //Intermediate + continuousFrames.add(frame); + } + } + + public synchronized void sendFrame(WebSocketFrame frame) throws IOException { + onSendFrame(frame); + frame.write(out); + } + + // --------------------------------Close----------------------------------- + + private void doClose(CloseCode code, String reason, boolean initiatedByRemote) { + if (state == State.CLOSED) { + return; + } + if (in != null) { + try { + in.close(); + } catch (IOException e) { + e.printStackTrace(); + } + } + if (out != null) { + try { + out.close(); + } catch (IOException e) { + e.printStackTrace(); + } + } + state = State.CLOSED; + onClose(this, code, reason, initiatedByRemote); + } + + // --------------------------------Public Facade--------------------------- + + public void ping(byte[] payload) throws IOException { + sendFrame(new WebSocketFrame(OpCode.Ping, true, payload)); + } + + public void send(byte[] payload) throws IOException { + sendFrame(new WebSocketFrame(OpCode.Binary, true, payload)); + } + + public void send(String payload) throws IOException { + sendFrame(new WebSocketFrame(OpCode.Text, true, payload)); + } + + public void close(CloseCode code, String reason) throws IOException { + State oldState = state; + state = State.CLOSING; + if (oldState == State.OPEN) { + sendFrame(new CloseFrame(code, reason)); + } else { + doClose(code, reason, false); + } + } + } + + public static class WebSocketFrame { + private OpCode opCode; + private boolean fin; + private byte[] maskingKey; + + private byte[] payload; + + private transient int _payloadLength; + private transient String _payloadString; + + private WebSocketFrame(OpCode opCode, boolean fin) { + setOpCode(opCode); + setFin(fin); + } + + public WebSocketFrame(OpCode opCode, boolean fin, byte[] payload, byte[] maskingKey) { + this(opCode, fin); + setMaskingKey(maskingKey); + setBinaryPayload(payload); + } + + public WebSocketFrame(OpCode opCode, boolean fin, byte[] payload) { + this(opCode, fin, payload, null); + } + + public WebSocketFrame(OpCode opCode, boolean fin, String payload, byte[] maskingKey) throws CharacterCodingException { + this(opCode, fin); + setMaskingKey(maskingKey); + setTextPayload(payload); + } + + public WebSocketFrame(OpCode opCode, boolean fin, String payload) throws CharacterCodingException { + this(opCode, fin, payload, null); + } + + public WebSocketFrame(WebSocketFrame clone) { + setOpCode(clone.getOpCode()); + setFin(clone.isFin()); + setBinaryPayload(clone.getBinaryPayload()); + setMaskingKey(clone.getMaskingKey()); + } + + public WebSocketFrame(OpCode opCode, List<WebSocketFrame> fragments) throws WebSocketException { + setOpCode(opCode); + setFin(true); + + long _payloadLength = 0; + for (WebSocketFrame inter : fragments) { + _payloadLength += inter.getBinaryPayload().length; + } + if (_payloadLength < 0 || _payloadLength > Integer.MAX_VALUE) { + throw new WebSocketException(CloseCode.MessageTooBig, "Max frame length has been exceeded."); + } + this._payloadLength = (int) _payloadLength; + byte[] payload = new byte[this._payloadLength]; + int offset = 0; + for (WebSocketFrame inter : fragments) { + System.arraycopy(inter.getBinaryPayload(), 0, payload, offset, inter.getBinaryPayload().length); + offset += inter.getBinaryPayload().length; + } + setBinaryPayload(payload); + } + + // --------------------------------GETTERS--------------------------------- + + public OpCode getOpCode() { + return opCode; + } + + public void setOpCode(OpCode opcode) { + this.opCode = opcode; + } + + public boolean isFin() { + return fin; + } + + public void setFin(boolean fin) { + this.fin = fin; + } + + public boolean isMasked() { + return maskingKey != null && maskingKey.length == 4; + } + + public byte[] getMaskingKey() { + return maskingKey; + } + + public void setMaskingKey(byte[] maskingKey) { + if (maskingKey != null && maskingKey.length != 4) { + throw new IllegalArgumentException("MaskingKey " + Arrays.toString(maskingKey) + " hasn't length 4"); + } + this.maskingKey = maskingKey; + } + + public void setUnmasked() { + setMaskingKey(null); + } + + public byte[] getBinaryPayload() { + return payload; + } + + public void setBinaryPayload(byte[] payload) { + this.payload = payload; + this._payloadLength = payload.length; + this._payloadString = null; + } + + public String getTextPayload() { + if (_payloadString == null) { + try { + _payloadString = binary2Text(getBinaryPayload()); + } catch (CharacterCodingException e) { + throw new RuntimeException("Undetected CharacterCodingException", e); + } + } + return _payloadString; + } + + public void setTextPayload(String payload) throws CharacterCodingException { + this.payload = text2Binary(payload); + this._payloadLength = payload.length(); + this._payloadString = payload; + } + + // --------------------------------SERIALIZATION--------------------------- + + public static WebSocketFrame read(InputStream in) throws IOException { + byte head = (byte) checkedRead(in.read()); + boolean fin = ((head & 0x80) != 0); + OpCode opCode = OpCode.find((byte) (head & 0x0F)); + if ((head & 0x70) != 0) { + throw new WebSocketException(CloseCode.ProtocolError, "The reserved bits (" + Integer.toBinaryString(head & 0x70) + ") must be 0."); + } + if (opCode == null) { + throw new WebSocketException(CloseCode.ProtocolError, "Received frame with reserved/unknown opcode " + (head & 0x0F) + "."); + } else if (opCode.isControlFrame() && !fin) { + throw new WebSocketException(CloseCode.ProtocolError, "Fragmented control frame."); + } + + WebSocketFrame frame = new WebSocketFrame(opCode, fin); + frame.readPayloadInfo(in); + frame.readPayload(in); + if (frame.getOpCode() == OpCode.Close) { + return new CloseFrame(frame); + } else { + return frame; + } + } + + private static int checkedRead(int read) throws IOException { + if (read < 0) { + throw new EOFException(); + } + return read; + } + + private void readPayloadInfo(InputStream in) throws IOException { + byte b = (byte) checkedRead(in.read()); + boolean masked = ((b & 0x80) != 0); + + _payloadLength = (byte) (0x7F & b); + if (_payloadLength == 126) { + // checkedRead must return int for this to work + _payloadLength = (checkedRead(in.read()) << 8 | checkedRead(in.read())) & 0xFFFF; + if (_payloadLength < 126) { + throw new WebSocketException(CloseCode.ProtocolError, "Invalid data frame 2byte length. (not using minimal length encoding)"); + } + } else if (_payloadLength == 127) { + long _payloadLength = ((long) checkedRead(in.read())) << 56 | + ((long) checkedRead(in.read())) << 48 | + ((long) checkedRead(in.read())) << 40 | + ((long) checkedRead(in.read())) << 32 | + checkedRead(in.read()) << 24 | checkedRead(in.read()) << 16 | checkedRead(in.read()) << 8 | checkedRead(in.read()); + if (_payloadLength < 65536) { + throw new WebSocketException(CloseCode.ProtocolError, "Invalid data frame 4byte length. (not using minimal length encoding)"); + } + if (_payloadLength < 0 || _payloadLength > Integer.MAX_VALUE) { + throw new WebSocketException(CloseCode.MessageTooBig, "Max frame length has been exceeded."); + } + this._payloadLength = (int) _payloadLength; + } + + if (opCode.isControlFrame()) { + if (_payloadLength > 125) { + throw new WebSocketException(CloseCode.ProtocolError, "Control frame with payload length > 125 bytes."); + } + if (opCode == OpCode.Close && _payloadLength == 1) { + throw new WebSocketException(CloseCode.ProtocolError, "Received close frame with payload len 1."); + } + } + + if (masked) { + maskingKey = new byte[4]; + int read = 0; + while (read < maskingKey.length) { + read += checkedRead(in.read(maskingKey, read, maskingKey.length - read)); + } + } + } + + private void readPayload(InputStream in) throws IOException { + payload = new byte[_payloadLength]; + int read = 0; + while (read < _payloadLength) { + read += checkedRead(in.read(payload, read, _payloadLength - read)); + } + + if (isMasked()) { + for (int i = 0; i < payload.length; i++) { + payload[i] ^= maskingKey[i % 4]; + } + } + + //Test for Unicode errors + if (getOpCode() == OpCode.Text) { + _payloadString = binary2Text(getBinaryPayload()); + } + } + + public void write(OutputStream out) throws IOException { + byte header = 0; + if (fin) { + header |= 0x80; + } + header |= opCode.getValue() & 0x0F; + out.write(header); + + _payloadLength = getBinaryPayload().length; + if (_payloadLength <= 125) { + out.write(isMasked() ? 0x80 | (byte) _payloadLength : (byte) _payloadLength); + } else if (_payloadLength <= 0xFFFF) { + out.write(isMasked() ? 0xFE : 126); + out.write(_payloadLength >>> 8); + out.write(_payloadLength); + } else { + out.write(isMasked() ? 0xFF : 127); + out.write(_payloadLength >>> 56 & 0); //integer only contains 31 bit + out.write(_payloadLength >>> 48 & 0); + out.write(_payloadLength >>> 40 & 0); + out.write(_payloadLength >>> 32 & 0); + out.write(_payloadLength >>> 24); + out.write(_payloadLength >>> 16); + out.write(_payloadLength >>> 8); + out.write(_payloadLength); + } + + + if (isMasked()) { + out.write(maskingKey); + for (int i = 0; i < _payloadLength; i++) { + out.write(getBinaryPayload()[i] ^ maskingKey[i % 4]); + } + } else { + out.write(getBinaryPayload()); + } + out.flush(); + } + + // --------------------------------ENCODING-------------------------------- + + public static final Charset TEXT_CHARSET = Charset.forName("UTF-8"); + + public static String binary2Text(byte[] payload) throws CharacterCodingException { + return new String(payload, TEXT_CHARSET); + } + + public static String binary2Text(byte[] payload, int offset, int length) throws CharacterCodingException { + return new String(payload, offset, length, TEXT_CHARSET); + } + + public static byte[] text2Binary(String payload) throws CharacterCodingException { + return payload.getBytes(TEXT_CHARSET); + } + + @Override + public String toString() { + final StringBuilder sb = new StringBuilder("WS["); + sb.append(getOpCode()); + sb.append(", ").append(isFin() ? "fin" : "inter"); + sb.append(", ").append(isMasked() ? "masked" : "unmasked"); + sb.append(", ").append(payloadToString()); + sb.append(']'); + return sb.toString(); + } + + private String payloadToString() { + if (payload == null) return "null"; + else { + final StringBuilder sb = new StringBuilder(); + sb.append('[').append(payload.length).append("b] "); + if (getOpCode() == OpCode.Text) { + String text = getTextPayload(); + if (text.length() > 100) + sb.append(text.substring(0, 100)).append("..."); + else + sb.append(text); + } else { + sb.append("0x"); + for (int i = 0; i < Math.min(payload.length, 50); ++i) + sb.append(Integer.toHexString((int) payload[i] & 0xFF)); + if (payload.length > 50) + sb.append("..."); + } + return sb.toString(); + } + } + + // --------------------------------CONSTANTS------------------------------- + + public static enum OpCode { + Continuation(0), Text(1), Binary(2), Close(8), Ping(9), Pong(10); + + private final byte code; + + private OpCode(int code) { + this.code = (byte) code; + } + + public byte getValue() { + return code; + } + + public boolean isControlFrame() { + return this == Close || this == Ping || this == Pong; + } + + public static OpCode find(byte value) { + for (OpCode opcode : values()) { + if (opcode.getValue() == value) { + return opcode; + } + } + return null; + } + } + + public static enum CloseCode { + NormalClosure(1000), GoingAway(1001), ProtocolError(1002), UnsupportedData(1003), NoStatusRcvd(1005), + AbnormalClosure(1006), InvalidFramePayloadData(1007), PolicyViolation(1008), MessageTooBig(1009), + MandatoryExt(1010), InternalServerError(1011), TLSHandshake(1015); + + private final int code; + + private CloseCode(int code) { + this.code = code; + } + + public int getValue() { + return code; + } + + public static CloseCode find(int value) { + for (CloseCode code : values()) { + if (code.getValue() == value) { + return code; + } + } + return null; + } + } + + // ------------------------------------------------------------------------ + + public static class CloseFrame extends WebSocketFrame { + private CloseCode _closeCode; + private String _closeReason; + + private CloseFrame(WebSocketFrame wrap) throws CharacterCodingException { + super(wrap); + assert wrap.getOpCode() == OpCode.Close; + if (wrap.getBinaryPayload().length >= 2) { + _closeCode = CloseCode.find((wrap.getBinaryPayload()[0] & 0xFF) << 8 | + (wrap.getBinaryPayload()[1] & 0xFF)); + _closeReason = binary2Text(getBinaryPayload(), 2, getBinaryPayload().length - 2); + } + } + + public CloseFrame(CloseCode code, String closeReason) throws CharacterCodingException { + super(OpCode.Close, true, generatePayload(code, closeReason)); + } + + private static byte[] generatePayload(CloseCode code, String closeReason) throws CharacterCodingException { + if (code != null) { + byte[] reasonBytes = text2Binary(closeReason); + byte[] payload = new byte[reasonBytes.length + 2]; + payload[0] = (byte) ((code.getValue() >> 8) & 0xFF); + payload[1] = (byte) ((code.getValue()) & 0xFF); + System.arraycopy(reasonBytes, 0, payload, 2, reasonBytes.length); + return payload; + } else { + return new byte[0]; + } + } + + public CloseCode getCloseCode() { + return _closeCode; + } + + public String getCloseReason() { + return _closeReason; + } + } + } + + public static class WebSocketException extends IOException { + private static final long serialVersionUID = 1L; + + private CloseCode code; + private String reason; + + public WebSocketException(Exception cause) { + this(CloseCode.InternalServerError, cause.toString(), cause); + } + + public WebSocketException(CloseCode code, String reason) { + this(code, reason, null); + } + + public WebSocketException(CloseCode code, String reason, Exception cause) { + super(code + ": " + reason, cause); + this.code = code; + this.reason = reason; + } + + public CloseCode getCode() { + return code; + } + + public String getReason() { + return reason; + } + } + + // --------------------------------Listener-------------------------------- + + protected abstract void onPong(WebSocket webSocket, WebSocketFrame pongFrame); + + protected abstract void onMessage(WebSocket webSocket, WebSocketFrame messageFrame); + + protected abstract void onClose(WebSocket webSocket, CloseCode code, String reason, boolean initiatedByRemote); + + protected abstract void onException(WebSocket webSocket, IOException e); + + protected void onFrameReceived(WebSocketFrame webSocket) { + // only for debugging + } + + public void onSendFrame(WebSocketFrame webSocket) { + // only for debugging } } |