forked from ua-parser/uap-java
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathOSParser.java
More file actions
152 lines (131 loc) · 4.58 KB
/
OSParser.java
File metadata and controls
152 lines (131 loc) · 4.58 KB
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
/**
* Copyright 2012 Twitter, Inc
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package ua_parser;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
/**
* Operating System parser using ua-parser. Extracts OS information from user agent strings.
*
* @author Steve Jiang (@sjiang) <gh at iamsteve com>
*/
public class OSParser {
private final List<OSPattern> patterns;
public OSParser(List<OSPattern> patterns) {
this.patterns = patterns;
}
public static OSParser fromList(List<Map<String,String>> configList) {
List<OSPattern> configPatterns = new ArrayList<OSPattern>();
for (Map<String,String> configMap : configList) {
configPatterns.add(OSParser.patternFromMap(configMap));
}
return new OSParser(configPatterns);
}
public OS parse(String agentString) {
if (agentString == null) {
return null;
}
OS os;
for (OSPattern p : patterns) {
if ((os = p.match(agentString)) != null) {
return os;
}
}
return new OS("Other", null, null, null, null);
}
protected static OSPattern patternFromMap(Map<String, String> configMap) {
String regex = configMap.get("regex");
if (regex == null) {
throw new IllegalArgumentException("OS is missing regex");
}
return(new OSPattern(Pattern.compile(regex),
configMap.get("os_replacement"),
configMap.get("os_v1_replacement"),
configMap.get("os_v2_replacement"),
configMap.get("os_v3_replacement")));
}
protected static class OSPattern {
private final Pattern pattern;
private final String osReplacement, v1Replacement, v2Replacement, v3Replacement;
public OSPattern(Pattern pattern, String osReplacement, String v1Replacement, String v2Replacement, String v3Replacement) {
this.pattern = pattern;
this.osReplacement = osReplacement;
this.v1Replacement = v1Replacement;
this.v2Replacement = v2Replacement;
this.v3Replacement = v3Replacement;
}
public OS match(String agentString) {
String family = null, v1 = null, v2 = null, v3 = null, v4 = null;
Matcher matcher = pattern.matcher(agentString);
if (!matcher.find()) {
return null;
}
int groupCount = matcher.groupCount();
if (osReplacement != null) {
if (groupCount >= 1) {
family = Pattern.compile("(" + Pattern.quote("$1") + ")")
.matcher(osReplacement)
.replaceAll(matcher.group(1));
} else {
family = osReplacement;
}
} else if (groupCount >= 1) {
family = matcher.group(1);
}
if (v1Replacement != null) {
v1 = getReplacement(matcher, v1Replacement);
} else if (groupCount >= 2) {
v1 = matcher.group(2);
}
if (v2Replacement != null) {
v2 = getReplacement(matcher, v2Replacement);
} else if (groupCount >= 3) {
v2 = matcher.group(3);
}
if (v3Replacement != null) {
v3 = getReplacement(matcher, v3Replacement);
} else if (groupCount >= 4) {
v3 = matcher.group(4);
}
if (groupCount >= 5) {
v4 = matcher.group(5);
}
return family == null ? null : new OS(family, v1, v2, v3, v4);
}
private String getReplacement(Matcher matcher, String replacement) {
if (isBackReference(replacement)) {
int group = getGroup(replacement);
return matcher.group(group);
} else {
return replacement;
}
}
/**
* Checks if the replacement is a backreference (i.e. $1, $2, $3, etc) to a capturing group in the regular expression.
*/
private boolean isBackReference(String replacement) {
return replacement.startsWith("$");
}
/**
* Extracts the group number from a backreference like $1, $2, $3, etc.
*/
private int getGroup(String backReference) {
return Integer.valueOf(backReference.substring(1));
}
}
}