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/*
* Copyright 2020 Anton Tananaev (anton@traccar.org)
*
* 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 org.traccar.helper;
import javax.servlet.http.HttpServletRequest;
public final class ServletHelper {
private ServletHelper() {
}
public static String retrieveRemoteAddress(HttpServletRequest request) {
if (request != null) {
String remoteAddress = request.getHeader("X-FORWARDED-FOR");
if (remoteAddress != null && !remoteAddress.isEmpty()) {
int separatorIndex = remoteAddress.indexOf(",");
if (separatorIndex > 0) {
return remoteAddress.substring(0, separatorIndex); // remove the additional data
} else {
return remoteAddress;
}
} else {
return request.getRemoteAddr();
}
} else {
return null;
}
}
}
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