| /* |
| * 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 javax.servlet.http.HttpServletRequest; |
| |
| /** |
| * Parses Git client User-Agent strings. |
| */ |
| public class ClientVersionUtil { |
| /** |
| * An invalid version of Git |
| * |
| * @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. |
| * @deprecated no widely used Git versions need this any more |
| */ |
| @Deprecated |
| public static boolean hasPushStatusBug(int[] version) { |
| return false; |
| } |
| |
| /** |
| * 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. |
| * @deprecated no widely used Git versions need this any more |
| */ |
| @Deprecated |
| public static boolean hasChunkedEncodingRequestBug( |
| int[] version, HttpServletRequest request) { |
| return false; |
| } |
| |
| private ClientVersionUtil() { |
| } |
| } |