| /* |
| * 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.guacamole.tunnel; |
| |
| import java.io.BufferedInputStream; |
| import java.io.BufferedOutputStream; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| import org.apache.guacamole.GuacamoleException; |
| import org.apache.guacamole.io.GuacamoleReader; |
| import org.apache.guacamole.net.DelegatingGuacamoleTunnel; |
| import org.apache.guacamole.net.GuacamoleTunnel; |
| import org.apache.guacamole.protocol.FilteredGuacamoleReader; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * GuacamoleTunnel implementation which provides for producing or consuming the |
| * contents of in-progress streams, rerouting blobs to a provided OutputStream |
| * or from a provided InputStream. Interception of streams is requested on a per |
| * stream basis and lasts only for the duration of that stream. |
| */ |
| public class StreamInterceptingTunnel extends DelegatingGuacamoleTunnel { |
| |
| /** |
| * Logger for this class. |
| */ |
| private static final Logger logger = |
| LoggerFactory.getLogger(StreamInterceptingTunnel.class); |
| |
| /** |
| * Creates a new StreamInterceptingTunnel which wraps the given tunnel, |
| * reading and intercepting stream-related instructions as necessary to |
| * fulfill calls to interceptStream(). |
| * |
| * @param tunnel |
| * The tunnel whose stream-related instruction should be intercepted if |
| * interceptStream() is invoked. |
| */ |
| public StreamInterceptingTunnel(GuacamoleTunnel tunnel) { |
| super(tunnel); |
| } |
| |
| /** |
| * The filter to use for providing stream data from InputStreams. |
| */ |
| private final InputStreamInterceptingFilter inputStreamFilter = |
| new InputStreamInterceptingFilter(this); |
| |
| /** |
| * The filter to use for rerouting received stream data to OutputStreams. |
| */ |
| private final OutputStreamInterceptingFilter outputStreamFilter = |
| new OutputStreamInterceptingFilter(this); |
| |
| /** |
| * Intercept all data received along the stream having the given index, |
| * writing that data to the given OutputStream. The OutputStream will |
| * automatically be closed when the stream ends. If there is no such |
| * stream, then the OutputStream will be closed immediately. This function |
| * will block until all received data has been written to the OutputStream |
| * and the OutputStream has been closed. |
| * |
| * @param index |
| * The index of the stream to intercept. |
| * |
| * @param stream |
| * The OutputStream to write all intercepted data to. |
| * |
| * @throws GuacamoleException |
| * If an error occurs while intercepting the stream, or if the stream |
| * itself reports an error. |
| */ |
| public void interceptStream(int index, OutputStream stream) |
| throws GuacamoleException { |
| |
| // Log beginning of intercepted stream |
| logger.debug("Intercepting output stream #{} of tunnel \"{}\".", |
| index, getUUID()); |
| |
| try { |
| outputStreamFilter.interceptStream(index, new BufferedOutputStream(stream)); |
| } |
| |
| // Log end of intercepted stream |
| finally { |
| logger.debug("Intercepted output stream #{} of tunnel \"{}\" ended.", |
| index, getUUID()); |
| } |
| |
| } |
| |
| /** |
| * Intercept the given stream, continuously writing the contents of the |
| * given InputStream as blobs. The stream will automatically end when |
| * when the end of the InputStream is reached. If there is no such |
| * stream, then the InputStream will be closed immediately. This function |
| * will block until all data from the InputStream has been written to the |
| * given stream. |
| * |
| * @param index |
| * The index of the stream to intercept. |
| * |
| * @param stream |
| * The InputStream to read all blobs data from. |
| * |
| * @throws GuacamoleException |
| * If an error occurs while intercepting the stream, or if the stream |
| * itself reports an error. |
| */ |
| public void interceptStream(int index, InputStream stream) |
| throws GuacamoleException { |
| |
| // Log beginning of intercepted stream |
| logger.debug("Intercepting input stream #{} of tunnel \"{}\".", |
| index, getUUID()); |
| |
| try { |
| inputStreamFilter.interceptStream(index, new BufferedInputStream(stream)); |
| } |
| |
| // Log end of intercepted stream |
| finally { |
| logger.debug("Intercepted input stream #{} of tunnel \"{}\" ended.", |
| index, getUUID()); |
| } |
| |
| } |
| |
| @Override |
| public GuacamoleReader acquireReader() { |
| |
| GuacamoleReader reader = super.acquireReader(); |
| |
| // Filter both input and output streams |
| reader = new FilteredGuacamoleReader(reader, inputStreamFilter); |
| reader = new FilteredGuacamoleReader(reader, outputStreamFilter); |
| |
| return reader; |
| |
| } |
| |
| @Override |
| public synchronized void close() throws GuacamoleException { |
| |
| // Close first, such that no further streams can be added via |
| // interceptStream() |
| try { |
| super.close(); |
| } |
| |
| // Close all intercepted streams |
| finally { |
| inputStreamFilter.closeAllInterceptedStreams(); |
| outputStreamFilter.closeAllInterceptedStreams(); |
| } |
| |
| } |
| |
| } |