/*
* Copyright 2016 Red Hat, Inc. and/or its affiliates
* and other contributors as indicated by the @author tags.
*
* 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.keycloak.common.util;
import java.util.regex.Pattern;
/**
* A utility class for handling URI template parameters. As the Java
* regulare expressions package does not handle named groups, this
* class attempts to simulate that functionality by using groups.
*
* @author Ryan J. McDonough
* @author Bill Burke
* @since 1.0
* Nov 8, 2006
*/
public class PathHelper
{
public static final String URI_PARAM_NAME_REGEX = "\\w[\\w\\.-]*";
public static final String URI_PARAM_REGEX_REGEX = "[^{}][^{}]*";
public static final String URI_PARAM_REGEX = "\\{\\s*(" + URI_PARAM_NAME_REGEX + ")\\s*(:\\s*(" + URI_PARAM_REGEX_REGEX + "))?\\}";
public static final Pattern URI_PARAM_PATTERN = Pattern.compile(URI_PARAM_REGEX);
/**
* A regex pattern that searches for a URI template parameter in the form of {*}
*/
public static final Pattern URI_TEMPLATE_PATTERN = Pattern.compile("(\\{([^}]+)\\})");
public static final char openCurlyReplacement = 6;
public static final char closeCurlyReplacement = 7;
public static String replaceEnclosedCurlyBraces(String str)
{
char[] chars = str.toCharArray();
int open = 0;
for (int i = 0; i < chars.length; i++)
{
if (chars[i] == '{')
{
if (open != 0) chars[i] = openCurlyReplacement;
open++;
}
else if (chars[i] == '}')
{
open--;
if (open != 0)
{
chars[i] = closeCurlyReplacement;
}
}
}
return new String(chars);
}
public static String recoverEnclosedCurlyBraces(String str)
{
return str.replace(openCurlyReplacement, '{').replace(closeCurlyReplacement, '}');
}
}