| /* |
| * Copyright (C) 2009-2010, 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 javax.servlet.http.HttpServletResponse.SC_PARTIAL_CONTENT; |
| import static javax.servlet.http.HttpServletResponse.SC_REQUESTED_RANGE_NOT_SATISFIABLE; |
| import static org.eclipse.jgit.util.HttpSupport.HDR_ACCEPT_RANGES; |
| import static org.eclipse.jgit.util.HttpSupport.HDR_CONTENT_LENGTH; |
| import static org.eclipse.jgit.util.HttpSupport.HDR_CONTENT_RANGE; |
| import static org.eclipse.jgit.util.HttpSupport.HDR_IF_RANGE; |
| import static org.eclipse.jgit.util.HttpSupport.HDR_RANGE; |
| |
| import java.io.EOFException; |
| import java.io.File; |
| import java.io.FileNotFoundException; |
| import java.io.IOException; |
| import java.io.OutputStream; |
| import java.io.RandomAccessFile; |
| import java.text.MessageFormat; |
| import java.util.Enumeration; |
| |
| import javax.servlet.http.HttpServletRequest; |
| import javax.servlet.http.HttpServletResponse; |
| |
| import org.eclipse.jgit.lib.ObjectId; |
| |
| /** |
| * Dumps a file over HTTP GET (or its information via HEAD). |
| * <p> |
| * Supports a single byte range requested via {@code Range} HTTP header. This |
| * feature supports a dumb client to resume download of a larger object file. |
| */ |
| final class FileSender { |
| private final File path; |
| |
| private final RandomAccessFile source; |
| |
| private final long lastModified; |
| |
| private final long fileLen; |
| |
| private long pos; |
| |
| private long end; |
| |
| FileSender(final File path) throws FileNotFoundException { |
| this.path = path; |
| this.source = new RandomAccessFile(path, "r"); |
| |
| try { |
| this.lastModified = path.lastModified(); |
| this.fileLen = source.getChannel().size(); |
| this.end = fileLen; |
| } catch (IOException e) { |
| try { |
| source.close(); |
| } catch (IOException closeError) { |
| // Ignore any error closing the stream. |
| } |
| |
| final FileNotFoundException r; |
| r = new FileNotFoundException(MessageFormat.format(HttpServerText.get().cannotGetLengthOf, path)); |
| r.initCause(e); |
| throw r; |
| } |
| } |
| |
| void close() { |
| try { |
| source.close(); |
| } catch (IOException e) { |
| // Ignore close errors on a read-only stream. |
| } |
| } |
| |
| long getLastModified() { |
| return lastModified; |
| } |
| |
| String getTailChecksum() throws IOException { |
| final int n = 20; |
| final byte[] buf = new byte[n]; |
| source.seek(fileLen - n); |
| source.readFully(buf, 0, n); |
| return ObjectId.fromRaw(buf).getName(); |
| } |
| |
| void serve(final HttpServletRequest req, final HttpServletResponse rsp, |
| final boolean sendBody) throws IOException { |
| if (!initRangeRequest(req, rsp)) { |
| rsp.sendError(SC_REQUESTED_RANGE_NOT_SATISFIABLE); |
| return; |
| } |
| |
| rsp.setHeader(HDR_ACCEPT_RANGES, "bytes"); |
| rsp.setHeader(HDR_CONTENT_LENGTH, Long.toString(end - pos)); |
| |
| if (sendBody) { |
| final OutputStream out = rsp.getOutputStream(); |
| try { |
| final byte[] buf = new byte[4096]; |
| source.seek(pos); |
| while (pos < end) { |
| final int r = (int) Math.min(buf.length, end - pos); |
| final int n = source.read(buf, 0, r); |
| if (n < 0) { |
| throw new EOFException(MessageFormat.format(HttpServerText.get().unexpectedeOFOn, path)); |
| } |
| out.write(buf, 0, n); |
| pos += n; |
| } |
| out.flush(); |
| } finally { |
| out.close(); |
| } |
| } |
| } |
| |
| private boolean initRangeRequest(final HttpServletRequest req, |
| final HttpServletResponse rsp) throws IOException { |
| final Enumeration<String> rangeHeaders = getRange(req); |
| if (!rangeHeaders.hasMoreElements()) { |
| // No range headers, the request is fine. |
| return true; |
| } |
| |
| final String range = rangeHeaders.nextElement(); |
| if (rangeHeaders.hasMoreElements()) { |
| // To simplify the code we support only one range. |
| return false; |
| } |
| |
| final int eq = range.indexOf('='); |
| final int dash = range.indexOf('-'); |
| if (eq < 0 || dash < 0 || !range.startsWith("bytes=")) { |
| return false; |
| } |
| |
| final String ifRange = req.getHeader(HDR_IF_RANGE); |
| if (ifRange != null && !getTailChecksum().equals(ifRange)) { |
| // If the client asked us to verify the ETag and its not |
| // what they expected we need to send the entire content. |
| return true; |
| } |
| |
| try { |
| if (eq + 1 == dash) { |
| // "bytes=-500" means last 500 bytes |
| pos = Long.parseLong(range.substring(dash + 1)); |
| pos = fileLen - pos; |
| } else { |
| // "bytes=500-" (position 500 to end) |
| // "bytes=500-1000" (position 500 to 1000) |
| pos = Long.parseLong(range.substring(eq + 1, dash)); |
| if (dash < range.length() - 1) { |
| end = Long.parseLong(range.substring(dash + 1)); |
| end++; // range was inclusive, want exclusive |
| } |
| } |
| } catch (NumberFormatException e) { |
| // We probably hit here because of a non-digit such as |
| // "," appearing at the end of the first range telling |
| // us there is a second range following. To simplify |
| // the code we support only one range. |
| return false; |
| } |
| |
| if (end > fileLen) { |
| end = fileLen; |
| } |
| if (pos >= end) { |
| return false; |
| } |
| |
| rsp.setStatus(SC_PARTIAL_CONTENT); |
| rsp.setHeader(HDR_CONTENT_RANGE, "bytes " + pos + "-" + (end - 1) + "/" |
| + fileLen); |
| source.seek(pos); |
| return true; |
| } |
| |
| @SuppressWarnings("unchecked") |
| private static Enumeration<String> getRange(final HttpServletRequest req) { |
| return req.getHeaders(HDR_RANGE); |
| } |
| } |