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- /*
- * Copyright (C) 2010, Google Inc.
- * and other copyright owners as documented in the project's IP log.
- *
- * This program and the accompanying materials are made available
- * under the terms of the Eclipse Distribution License v1.0 which
- * accompanies this distribution, is reproduced below, and is
- * available at http://www.eclipse.org/org/documents/edl-v10.php
- *
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or
- * without modification, are permitted provided that the following
- * conditions are met:
- *
- * - Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * - Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following
- * disclaimer in the documentation and/or other materials provided
- * with the distribution.
- *
- * - Neither the name of the Eclipse Foundation, Inc. nor the
- * names of its contributors may be used to endorse or promote
- * products derived from this software without specific prior
- * written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
- * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
- * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
- * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
- * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
- package org.eclipse.jgit.http.server;
-
- import static org.eclipse.jgit.http.server.ServletUtils.acceptsGzipEncoding;
- import static org.eclipse.jgit.util.HttpSupport.ENCODING_GZIP;
- import static org.eclipse.jgit.util.HttpSupport.HDR_CONTENT_ENCODING;
-
- import java.io.IOException;
- import java.io.OutputStream;
- import java.util.zip.GZIPOutputStream;
-
- import javax.servlet.http.HttpServletRequest;
- import javax.servlet.http.HttpServletResponse;
-
- import org.eclipse.jgit.util.TemporaryBuffer;
-
- /**
- * Buffers a response, trying to gzip it if the user agent supports that.
- * <p>
- * If the response overflows the buffer, gzip is skipped and the response is
- * streamed to the client as its produced, most likely using HTTP/1.1 chunked
- * encoding. This is useful for servlets that produce mixed-mode content, where
- * smaller payloads are primarily pure text that compresses well, while much
- * larger payloads are heavily compressed binary data. {@link UploadPackServlet}
- * is one such servlet.
- */
- class SmartOutputStream extends TemporaryBuffer {
- private static final int LIMIT = 32 * 1024;
-
- private final HttpServletRequest req;
- private final HttpServletResponse rsp;
- private boolean compressStream;
- private boolean startedOutput;
-
- SmartOutputStream(final HttpServletRequest req,
- final HttpServletResponse rsp,
- boolean compressStream) {
- super(LIMIT);
- this.req = req;
- this.rsp = rsp;
- this.compressStream = compressStream;
- }
-
- @Override
- protected OutputStream overflow() throws IOException {
- startedOutput = true;
-
- OutputStream out = rsp.getOutputStream();
- if (compressStream && acceptsGzipEncoding(req)) {
- rsp.setHeader(HDR_CONTENT_ENCODING, ENCODING_GZIP);
- out = new GZIPOutputStream(out);
- }
- return out;
- }
-
- public void close() throws IOException {
- super.close();
-
- if (!startedOutput) {
- // If output hasn't started yet, the entire thing fit into our
- // buffer. Try to use a proper Content-Length header, and also
- // deflate the response with gzip if it will be smaller.
- TemporaryBuffer out = this;
-
- if (256 < out.length() && acceptsGzipEncoding(req)) {
- TemporaryBuffer gzbuf = new TemporaryBuffer.Heap(LIMIT);
- try {
- GZIPOutputStream gzip = new GZIPOutputStream(gzbuf);
- try {
- out.writeTo(gzip, null);
- } finally {
- gzip.close();
- }
- if (gzbuf.length() < out.length()) {
- out = gzbuf;
- rsp.setHeader(HDR_CONTENT_ENCODING, ENCODING_GZIP);
- }
- } catch (IOException err) {
- // Most likely caused by overflowing the buffer, meaning
- // its larger if it were compressed. Discard compressed
- // copy and use the original.
- }
- }
-
- // The Content-Length cannot overflow when cast to an int, our
- // hardcoded LIMIT constant above assures us we wouldn't store
- // more than 2 GiB of content in memory.
- rsp.setContentLength((int) out.length());
- final OutputStream os = rsp.getOutputStream();
- try {
- out.writeTo(os, null);
- os.flush();
- } finally {
- os.close();
- }
- }
- }
- }
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