| /* |
| * 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(); |
| } |
| } |
| } |
| } |