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/*
* 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.kafka.common.utils;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;
import java.util.regex.Pattern;
import javax.management.ObjectName;
import org.apache.kafka.common.KafkaException;
/**
* Utility class for sanitizing/desanitizing/quoting values used in JMX metric names
* or as ZooKeeper node name.
*
* User principals and client-ids are URL-encoded using ({@link #sanitize(String)}
* for use as ZooKeeper node names. User principals are URL-encoded in all metric
* names as well. All other metric tags including client-id are quoted if they
* contain special characters using {@link #jmxSanitize(String)} when
* registering in JMX.
*/
public class Sanitizer {
/**
* Even though only a small number of characters are disallowed in JMX, quote any
* string containing special characters to be safe. All characters in strings sanitized
* using {@link #sanitize(String)} are safe for JMX and hence included here.
*/
private static final Pattern MBEAN_PATTERN = Pattern.compile("[\\w-%\\. \t]*");
/**
* Sanitize `name` for safe use as JMX metric name as well as ZooKeeper node name
* using URL-encoding.
*/
public static String sanitize(String name) {
try {
String encoded = URLEncoder.encode(name, StandardCharsets.UTF_8.name());
StringBuilder builder = new StringBuilder();
for (int i = 0; i < encoded.length(); i++) {
char c = encoded.charAt(i);
if (c == '*') { // Metric ObjectName treats * as pattern
builder.append("%2A");
} else if (c == '+') { // Space URL-encoded as +, replace with percent encoding
builder.append("%20");
} else {
builder.append(c);
}
}
return builder.toString();
} catch (UnsupportedEncodingException e) {
throw new KafkaException(e);
}
}
/**
* Desanitize name that was URL-encoded using {@link #sanitize(String)}. This
* is used to obtain the desanitized version of node names in ZooKeeper.
*/
public static String desanitize(String name) {
try {
return URLDecoder.decode(name, StandardCharsets.UTF_8.name());
} catch (UnsupportedEncodingException e) {
throw new KafkaException(e);
}
}
/**
* Quote `name` using {@link ObjectName#quote(String)} if `name` contains
* characters that are not safe for use in JMX. User principals that are
* already sanitized using {@link #sanitize(String)} will not be quoted
* since they are safe for JMX.
*/
public static String jmxSanitize(String name) {
return MBEAN_PATTERN.matcher(name).matches() ? name : ObjectName.quote(name);
}
}