/**
* JBoss, Home of Professional Open Source
* Copyright Red Hat, Inc., and individual contributors.
*
* 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.jboss.aerogear.unifiedpush.rest.util;
import javax.servlet.http.HttpServletRequest;
import java.util.regex.Pattern;
/**
* Helper for various tasks for working with {@link javax.servlet.http.HttpServletRequest} objects.
*/
public final class HttpRequestUtil {
private HttpRequestUtil() {
// no-op
}
// from JSR 303
private static final Pattern IP_ADDR_PATTERN = Pattern.compile("^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])$");
/**
* Returns FALSE when sorting query value matches 'desc', otherwise it returns TRUE.
*
* @param sorting the sorting value from the http header
*
* @return false for 'desc; or true for 'asc'
*/
public static Boolean extractSortingQueryParamValue(String sorting) {
if ("desc".equalsIgnoreCase(sorting)) {
return Boolean.FALSE;
} else {
return Boolean.TRUE;
}
}
/**
* Extracts the IP address from the given {@link javax.servlet.http.HttpServletRequest}.
*
* @param request to inspect
*
* @return the IP address from the given request
*/
public static String extractIPAddress(final HttpServletRequest request) {
String ip = request.getHeader("x-forwarded-for");
if (isIPAdressValid(ip)) {
return ip;
}
ip = request.getHeader("Proxy-Client-IP");
if (isIPAdressValid(ip)) {
return ip;
}
ip = request.getHeader("WL-Proxy-Client-IP");
if (isIPAdressValid(ip)) {
return ip;
}
return request.getRemoteAddr();
}
/**
* Reads the "aerogear-sender" header to check if an AeroGear Sender client was used. If the header value is NULL
* the value of the standard "user-agent" header is returned
*
* @param request to inspect
*
* @return value of header
*/
public static String extractAeroGearSenderInformation(final HttpServletRequest request) {
String client = request.getHeader("aerogear-sender");
if (hasValue(client)) {
return client;
}
// if there was no usage of our custom header, we simply return the user-agent value
return request.getHeader("user-agent");
}
/**
* Simple validation, using java.net.InetAddress.getByName().
*
* @param ip the IP address string to check
*
* @return true for a valid IP address
*/
private static boolean isIPAdressValid(final String ip){
// InetAddress.getByName() validates 'null' as a valid IP (localhost).
// we do not want that
if (hasValue(ip)) {
return IP_ADDR_PATTERN.matcher(ip).matches();
}
return false;
}
private static boolean hasValue(final String value) {
return value != null && !value.isEmpty();
}
}