Example how to reject a handshake as a server

Author: marci4

src/main/example/ServerRejectHandshakeExample.java

@@ -0,0 +1,90 @@
+/*
+ * Copyright (c) 2010-2017 Nathan Rajlich
+ *
+ *  Permission is hereby granted, free of charge, to any person
+ *  obtaining a copy of this software and associated documentation
+ *  files (the "Software"), to deal in the Software without
+ *  restriction, including without limitation the rights to use,
+ *  copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *  copies of the Software, and to permit persons to whom the
+ *  Software is furnished to do so, subject to the following
+ *  conditions:
+ *
+ *  The above copyright notice and this permission notice shall be
+ *  included in all copies or substantial portions of the Software.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ *  OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ *  HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ *  WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ *  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ *  OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+import org.java_websocket.WebSocket;
+import org.java_websocket.WebSocketImpl;
+import org.java_websocket.drafts.Draft;
+import org.java_websocket.exceptions.InvalidDataException;
+import org.java_websocket.framing.CloseFrame;
+import org.java_websocket.handshake.ClientHandshake;
+import org.java_websocket.handshake.ServerHandshakeBuilder;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.net.InetSocketAddress;
+
+/**
+ * This example shows how to reject a handshake as a server from a client.
+ *
+ * For this you have to override onWebsocketHandshakeReceivedAsServer in your WebSocketServer class
+ */
+public class ServerRejectHandshakeExample extends ChatServer {
+
+	public ServerRejectHandshakeExample( int port ) {
+		super( new InetSocketAddress( port ));
+	}
+
+	@Override
+	public ServerHandshakeBuilder onWebsocketHandshakeReceivedAsServer( WebSocket conn, Draft draft, ClientHandshake request) throws InvalidDataException {
+		ServerHandshakeBuilder builder = super.onWebsocketHandshakeReceivedAsServer( conn, draft, request );
+		//In this example we don't allow any resource descriptor ( "ws://localhost:8887/?roomid=1 will be rejected but ws://localhost:8887 is fine)
+		if (! request.getResourceDescriptor().equals( "/" )) {
+			throw new InvalidDataException( CloseFrame.POLICY_VALIDATION, "Not accepted!");
+		}
+		//If there are no cookies set reject it as well.
+		if (!request.hasFieldValue( "Cookie" )) {
+			throw new InvalidDataException( CloseFrame.POLICY_VALIDATION, "Not accepted!");
+		}
+		//If the cookie does not contain a specific value
+		if (!request.getFieldValue( "Cookie" ).equals( "username=nemo" )) {
+			throw new InvalidDataException( CloseFrame.POLICY_VALIDATION, "Not accepted!");
+		}
+		return builder;
+	}
+
+
+	public static void main( String[] args ) throws InterruptedException , IOException {
+		WebSocketImpl.DEBUG = true;
+		int port = 8887; // 843 flash policy port
+		try {
+			port = Integer.parseInt( args[ 0 ] );
+		} catch ( Exception ex ) {
+		}
+		ServerRejectHandshakeExample s = new ServerRejectHandshakeExample( port );
+		s.start();
+		System.out.println( "Server started on port: " + s.getPort() );
+
+		BufferedReader sysin = new BufferedReader( new InputStreamReader( System.in ) );
+		while ( true ) {
+			String in = sysin.readLine();
+			s.broadcast( in );
+			if( in.equals( "exit" ) ) {
+				s.stop();
+				break;
+			}
+		}
+	}
+}