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- /*
- * Copyright (C) 2012, 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.isChunked;
-
- import javax.servlet.http.HttpServletRequest;
-
- /** Parses Git client User-Agent strings. */
- public class ClientVersionUtil {
- private static final int[] v1_7_5 = { 1, 7, 5 };
- private static final int[] v1_7_8_6 = { 1, 7, 8, 6 };
- private static final int[] v1_7_9 = { 1, 7, 9 };
-
- /** @return maximum version array, indicating an invalid version of Git. */
- public static int[] invalidVersion() {
- return new int[] { Integer.MAX_VALUE };
- }
-
- /**
- * Parse a Git client User-Agent header value.
- *
- * @param version
- * git client version string, of the form "git/1.7.9".
- * @return components of the version string. {@link #invalidVersion()} if
- * the version string cannot be parsed.
- */
- public static int[] parseVersion(String version) {
- if (version != null && version.startsWith("git/"))
- return splitVersion(version.substring("git/".length()));
- return invalidVersion();
- }
-
- private static int[] splitVersion(String versionString) {
- char[] str = versionString.toCharArray();
- int[] ver = new int[4];
- int end = 0;
- int acc = 0;
- for (int i = 0; i < str.length; i++) {
- char c = str[i];
- if ('0' <= c && c <= '9') {
- acc *= 10;
- acc += c - '0';
- } else if (c == '.') {
- if (end == ver.length)
- ver = grow(ver);
- ver[end++] = acc;
- acc = 0;
- } else if (c == 'g' && 0 < i && str[i - 1] == '.' && 0 < end) {
- // Non-tagged builds may contain a mangled git describe output.
- // "1.7.6.1.45.gbe0cc". The 45 isn't a valid component. Drop it.
- ver[end - 1] = 0;
- acc = 0;
- break;
- } else if (c == '-' && (i + 2) < str.length
- && str[i + 1] == 'r' && str[i + 2] == 'c') {
- // Release candidates aren't the same as a final release.
- if (acc > 0)
- acc--;
- break;
- } else
- break;
- }
- if (acc != 0) {
- if (end == ver.length)
- ver = grow(ver);
- ver[end++] = acc;
- } else {
- while (0 < end && ver[end - 1] == 0)
- end--;
- }
- if (end < ver.length) {
- int[] n = new int[end];
- System.arraycopy(ver, 0, n, 0, end);
- ver = n;
- }
- return ver;
- }
-
- private static int[] grow(int[] tmp) {
- int[] n = new int[tmp.length + 1];
- System.arraycopy(tmp, 0, n, 0, tmp.length);
- return n;
- }
-
- /**
- * Compare two version strings for natural ordering.
- *
- * @param a
- * first parsed version string.
- * @param b
- * second parsed version string.
- * @return < 0 if a is before b; 0 if a equals b; >0 if a is after b.
- */
- public static int compare(int[] a, int[] b) {
- for (int i = 0; i < a.length && i < b.length; i++) {
- int cmp = a[i] - b[i];
- if (cmp != 0)
- return cmp;
- }
- return a.length - b.length;
- }
-
- /**
- * Convert a parsed version back to a string.
- *
- * @param ver
- * the parsed version array.
- * @return a string, e.g. "1.6.6.0".
- */
- public static String toString(int[] ver) {
- StringBuilder b = new StringBuilder();
- for (int v : ver) {
- if (b.length() > 0)
- b.append('.');
- b.append(v);
- }
- return b.toString();
- }
-
- /**
- * Check if a Git client has the known push status bug.
- * <p>
- * These buggy clients do not display the status report from a failed push
- * over HTTP.
- *
- * @param version
- * parsed version of the Git client software.
- * @return true if the bug is present.
- */
- public static boolean hasPushStatusBug(int[] version) {
- int cmp = compare(version, v1_7_8_6);
- if (cmp < 0)
- return true; // Everything before 1.7.8.6 is known broken.
- else if (cmp == 0)
- return false; // 1.7.8.6 contained the bug fix.
-
- if (compare(version, v1_7_9) <= 0)
- return true; // 1.7.9 shipped before 1.7.8.6 and has the bug.
- return false; // 1.7.9.1 and later are fixed.
- }
-
- /**
- * Check if a Git client has the known chunked request body encoding bug.
- * <p>
- * Git 1.7.5 contains a unique bug where chunked requests are malformed.
- * This applies to both fetch and push.
- *
- * @param version
- * parsed version of the Git client software.
- * @param request
- * incoming HTTP request.
- * @return true if the client has the chunked encoding bug.
- */
- public static boolean hasChunkedEncodingRequestBug(
- int[] version, HttpServletRequest request) {
- return compare(version, v1_7_5) == 0 && isChunked(request);
- }
-
- private ClientVersionUtil() {
- }
- }
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