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/*
* Copyright 2011 gitblit.com.
*
* 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.gitblit.utils;
import javax.servlet.http.HttpServletRequest;
/**
* Collection of utility methods for http requests.
*
* @author James Moger
*
*/
public class HttpUtils {
/**
* Returns the Gitblit URL based on the request.
*
* @param request
* @return the host url
*/
public static String getGitblitURL(HttpServletRequest request) {
// default to the request scheme and port
String scheme = request.getScheme();
int port = request.getServerPort();
// try to use reverse-proxy server's port
String forwardedPort = request.getHeader("X-Forwarded-Port");
if (StringUtils.isEmpty(forwardedPort)) {
forwardedPort = request.getHeader("X_Forwarded_Port");
}
if (!StringUtils.isEmpty(forwardedPort)) {
// reverse-proxy server has supplied the original port
try {
port = Integer.parseInt(forwardedPort);
} catch (Throwable t) {
}
}
// try to use reverse-proxy server's scheme
String forwardedScheme = request.getHeader("X-Forwarded-Proto");
if (StringUtils.isEmpty(forwardedScheme)) {
forwardedScheme = request.getHeader("X_Forwarded_Proto");
}
if (!StringUtils.isEmpty(forwardedScheme)) {
// reverse-proxy server has supplied the original scheme
scheme = forwardedScheme;
if ("https".equals(scheme) && port == 80) {
// proxy server is https, inside server is 80
// this is likely because the proxy server has not supplied
// x-forwarded-port. since 80 is almost definitely wrong,
// make an educated guess that 443 is correct.
port = 443;
}
}
String context = request.getContextPath();
String forwardedContext = request.getHeader("X-Forwarded-Context");
if (forwardedContext != null) {
forwardedContext = request.getHeader("X_Forwarded_Context");
}
if (!StringUtils.isEmpty(forwardedContext)) {
context = forwardedContext;
}
// trim any trailing slash
if (context.length() > 0 && context.charAt(context.length() - 1) == '/') {
context = context.substring(1);
}
StringBuilder sb = new StringBuilder();
sb.append(scheme);
sb.append("://");
sb.append(request.getServerName());
if (("http".equals(scheme) && port != 80)
|| ("https".equals(scheme) && port != 443)) {
sb.append(":" + port);
}
sb.append(context);
return sb.toString();
}
}
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