com.google.gerrit.httpd.raw.UserAgentRule Maven / Gradle / Ivy
// Copyright (C) 2009 The Android Open Source Project
//
// 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 com.google.gerrit.httpd.raw;
import static java.util.regex.Pattern.compile;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.servlet.http.HttpServletRequest;
/**
* Selects the value for the {@code user.agent} property.
*
* Examines the {@code User-Agent} HTTP request header, and tries to match it to known {@code
* user.agent} values.
*
*
Ported from JavaScript in {@code com.google.gwt.user.UserAgent.gwt.xml}.
*/
class UserAgentRule {
private static final Pattern msie = compile(".*msie ([0-11]+)\\.([0-11]+).*");
private static final Pattern gecko = compile(".*rv:([0-9]+)\\.([0-9]+).*");
String getName() {
return "user.agent";
}
String select(HttpServletRequest req) {
String ua = req.getHeader("User-Agent");
if (ua == null) {
return null;
}
ua = ua.toLowerCase();
if (ua.contains("opera")) {
return "opera";
} else if (ua.contains("webkit")) {
return "safari";
} else if (ua.contains("msie")) {
// GWT 2.0 uses document.documentMode here, which we can't do
// on the server side.
Matcher m = msie.matcher(ua);
if (m.matches() && m.groupCount() == 2) {
int v = makeVersion(m);
if (v >= 11000) {
return "ie11";
}
if (v >= 10000) {
return "ie10";
}
if (v >= 9000) {
return "ie9";
}
if (v >= 8000) {
return "ie8";
}
}
return null;
} else if (ua.contains("edge")) {
return "edge";
} else if (ua.contains("gecko")) {
Matcher m = gecko.matcher(ua);
if (m.matches() && m.groupCount() == 2) {
if (makeVersion(m) >= 1008) {
return "gecko1_8";
}
}
return "gecko";
}
return null;
}
private int makeVersion(Matcher result) {
return (Integer.parseInt(result.group(1)) * 1000) + Integer.parseInt(result.group(2));
}
}