com.panforge.robotstxt.URLDecoder Maven / Gradle / Ivy
/*
* Copyright 2016 Piotr Andzel.
*
* 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.panforge.robotstxt;
import java.nio.charset.StandardCharsets;
/**
* URL decoder for robots.
*/
class URLDecoder {
/**
* Decodes URL octets except %2f (i.e. / character)
* @param str string to encode
* @return encoded string
*/
public static String decode(String str) {
if (str!=null) {
try {
StringBuilder sb = new StringBuilder();
for (int idx = str.toLowerCase().indexOf("%2f"); idx>=0; idx = str.toLowerCase().indexOf("%2f")) {
sb.append(java.net.URLDecoder.decode(str.substring(0, idx), StandardCharsets.UTF_8)).append(str, idx, idx+3);
str = str.substring(idx+3);
}
sb.append(java.net.URLDecoder.decode(str, StandardCharsets.UTF_8));
str = sb.toString();
} catch (Exception ex) {
}
}
return str;
}
}