/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.brooklyn.util.net;
/**
* Encodes URLs, escaping as appropriate.
*
* Copied from fmucar's answer in http://stackoverflow.com/questions/724043/http-url-address-encoding-in-java
*
* TODO Want to use a library utility, but couldn't find this in guava and don't want to introduce
* dependency on commons-httpclient-3.1 to use URIUtil.
*
* @author aled
*/
public class URLParamEncoder {
public static String encode(String input) {
StringBuilder resultStr = new StringBuilder();
for (char ch : input.toCharArray()) {
if (isUnsafe(ch)) {
resultStr.append('%');
resultStr.append(toHex(ch / 16));
resultStr.append(toHex(ch % 16));
} else {
resultStr.append(ch);
}
}
return resultStr.toString();
}
private static char toHex(int ch) {
return (char) (ch < 10 ? '0' + ch : 'A' + ch - 10);
}
private static boolean isUnsafe(char ch) {
if (ch > 128 || ch < 0)
return true;
return (" %$&+,/:;=?@<>#%"
// these are included in httpclient URI as "unwise", and have been found to be problematic
// * backslash in a query param breaks URI.create
+ "\\"
).indexOf(ch) >= 0;
}
}