|
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166 |
- /*
- * Copyright (C) 2012, Google Inc. and others
- *
- * This program and the accompanying materials are made available under the
- * terms of the Eclipse Distribution License v. 1.0 which is available at
- * https://www.eclipse.org/org/documents/edl-v10.php.
- *
- * SPDX-License-Identifier: BSD-3-Clause
- */
-
- 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() {
- }
- }
|