/
RedirectUtil.java
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/
RedirectUtil.java
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//
// ========================================================================
// Copyright (c) 1995-2021 Mort Bay Consulting Pty Ltd and others.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
//
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
//
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
//
package org.eclipse.jetty.rewrite.handler;
import javax.servlet.http.HttpServletRequest;
import org.eclipse.jetty.util.URIUtil;
/**
* Utility for managing redirect based rules
*/
public final class RedirectUtil
{
/**
* Common point to generate a proper "Location" header for redirects.
*
* @param request the request the redirect should be based on (needed when relative locations are provided, so that
* server name, scheme, port can be built out properly)
* @param location the location URL to redirect to (can be a relative path)
* @return the full redirect "Location" URL (including scheme, host, port, path, etc...)
*/
public static String toRedirectURL(final HttpServletRequest request, String location)
{
if (!URIUtil.hasScheme(location))
{
StringBuilder url = new StringBuilder(128);
URIUtil.appendSchemeHostPort(url, request.getScheme(), request.getServerName(), request.getServerPort());
if (location.startsWith("/"))
{
// absolute in context
location = URIUtil.canonicalURI(location);
}
else
{
// relative to request
String path = request.getRequestURI();
String parent = (path.endsWith("/")) ? path : URIUtil.parentPath(path);
location = URIUtil.canonicalURI(URIUtil.addEncodedPaths(parent, location));
if (location != null && !location.startsWith("/"))
url.append('/');
}
if (location == null)
throw new IllegalStateException("redirect path cannot be above root");
url.append(location);
location = url.toString();
}
return location;
}
}