com.ocpsoft.pretty.faces.util.URLDuplicatePathCanonicalizer Maven / Gradle / Ivy
/*
* Copyright 2010 Lincoln Baxter, III
*
* 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.ocpsoft.pretty.faces.util;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* @author Lincoln Baxter, III
*/
public class URLDuplicatePathCanonicalizer
{
private final Pattern pattern = Pattern.compile("(/[^/]+/)\\.\\.(/[^/]+/)");
/**
* Canonicalize a given URL, replacing relative path structures with the
* condensed path. (Eg. /xxxx/../xxxx/ => /xxxx/)
*
* @return Return the canonicalized URL. If the URL requires no
* canonicalization, return the original unmodified URL.
*/
public String canonicalize(final String url)
{
if (url != null && url.contains("/../"))
{
StringBuffer result = new StringBuffer();
Matcher m = pattern.matcher(url);
while (m.find())
{
if (m.group(1).equals(m.group(2)))
{
m.appendReplacement(result, m.group(1));
}
m.appendTail(result);
}
return result.toString();
}
return url;
}
}