1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
|
/*
* 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 jakarta.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
* @since 7.0
*/
@Deprecated
public static boolean hasChunkedEncodingRequestBug(
int[] version, HttpServletRequest request) {
return false;
}
private ClientVersionUtil() {
}
}
|
