/*
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* Copyright 2011 gitblit.com.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.gitblit.utils;
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import javax.servlet.http.HttpServletRequest;
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/**
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* Collection of utility methods for http requests.
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*
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* @author James Moger
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*
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*/
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public class HttpUtils {
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/**
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* Returns the Gitblit URL based on the request.
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*
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* @param request
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* @return the host url
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*/
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public static String getGitblitURL(HttpServletRequest request) {
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// default to the request scheme and port
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String scheme = request.getScheme();
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int port = request.getServerPort();
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// try to use reverse-proxy server's port
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String forwardedPort = request.getHeader("X-Forwarded-Port");
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if (StringUtils.isEmpty(forwardedPort)) {
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forwardedPort = request.getHeader("X_Forwarded_Port");
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}
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if (!StringUtils.isEmpty(forwardedPort)) {
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// reverse-proxy server has supplied the original port
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try {
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port = Integer.parseInt(forwardedPort);
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} catch (Throwable t) {
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}
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}
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// try to use reverse-proxy server's scheme
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String forwardedScheme = request.getHeader("X-Forwarded-Proto");
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if (StringUtils.isEmpty(forwardedScheme)) {
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forwardedScheme = request.getHeader("X_Forwarded_Proto");
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}
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if (!StringUtils.isEmpty(forwardedScheme)) {
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// reverse-proxy server has supplied the original scheme
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scheme = forwardedScheme;
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if ("https".equals(scheme) && port == 80) {
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// proxy server is https, inside server is 80
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// this is likely because the proxy server has not supplied
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// x-forwarded-port. since 80 is almost definitely wrong,
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// make an educated guess that 443 is correct.
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port = 443;
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}
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}
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String context = request.getContextPath();
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String forwardedContext = request.getHeader("X-Forwarded-Context");
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if (forwardedContext != null) {
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forwardedContext = request.getHeader("X_Forwarded_Context");
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}
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if (!StringUtils.isEmpty(forwardedContext)) {
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context = forwardedContext;
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}
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// trim any trailing slash
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if (context.length() > 0 && context.charAt(context.length() - 1) == '/') {
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context = context.substring(1);
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}
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StringBuilder sb = new StringBuilder();
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sb.append(scheme);
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sb.append("://");
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sb.append(request.getServerName());
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if (("http".equals(scheme) && port != 80)
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|| ("https".equals(scheme) && port != 443)) {
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sb.append(":" + port);
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}
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sb.append(context);
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return sb.toString();
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}
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}
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