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UserAgentParser.java
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120 lines (102 loc) · 3.55 KB
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/**
* 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.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* User Agent parser using ua-parser regexes
*
* @author Steve Jiang (@sjiang) <gh at iamsteve com>
*/
public class UserAgentParser {
private final List<UAPattern> patterns;
public UserAgentParser(List<UAPattern> patterns) {
this.patterns = patterns;
}
public static UserAgentParser fromList(List<Map<String,String>> configList) {
List<UAPattern> configPatterns = new ArrayList<UAPattern>();
for (Map<String, String> configMap : configList) {
configPatterns.add(UserAgentParser.patternFromMap(configMap));
}
return new UserAgentParser(configPatterns);
}
public UserAgent parse(String agentString) {
if (agentString == null) {
return null;
}
UserAgent agent;
for (UAPattern p : patterns) {
if ((agent = p.match(agentString)) != null) {
return agent;
}
}
return new UserAgent("Other", null, null, null);
}
protected static UAPattern patternFromMap(Map<String, String> configMap) {
String regex = configMap.get("regex");
if (regex == null) {
throw new IllegalArgumentException("User agent is missing regex");
}
return(new UAPattern(Pattern.compile(regex),
configMap.get("family_replacement"),
configMap.get("v1_replacement"),
configMap.get("v2_replacement")));
}
protected static class UAPattern {
private final Pattern pattern;
private final String familyReplacement, v1Replacement, v2Replacement;
public UAPattern(Pattern pattern, String familyReplacement, String v1Replacement, String v2Replacement) {
this.pattern = pattern;
this.familyReplacement = familyReplacement;
this.v1Replacement = v1Replacement;
this.v2Replacement = v2Replacement;
}
public UserAgent match(String agentString) {
String family = null, v1 = null, v2 = null, v3 = null;
Matcher matcher = pattern.matcher(agentString);
if (!matcher.find()) {
return null;
}
int groupCount = matcher.groupCount();
if (familyReplacement != null) {
if (familyReplacement.contains("$1") && groupCount >= 1 && matcher.group(1) != null) {
family = familyReplacement.replaceFirst("\\$1", Matcher.quoteReplacement(matcher.group(1)));
} else {
family = familyReplacement;
}
} else if (groupCount >= 1) {
family = matcher.group(1);
}
if (v1Replacement != null) {
v1 = v1Replacement;
} else if (groupCount >= 2) {
v1 = matcher.group(2);
}
if (v2Replacement != null) {
v2 = v2Replacement;
} else if (groupCount >= 3) {
v2 = matcher.group(3);
if (groupCount >= 4) {
v3 = matcher.group(4);
}
}
return family == null ? null : new UserAgent(family, v1, v2, v3);
}
}
}