You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
166 lines
4.2 KiB
166 lines
4.2 KiB
/* |
|
* 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() { |
|
} |
|
}
|
|
|