/*
* Copyright 2013-2017 the original author or authors.
*
* 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.cloudfoundry;
import reactor.core.Exceptions;
import java.math.BigInteger;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.Random;
final class RandomNameFactory implements NameFactory {
private static final int PORT_MAXIMUM = 65_535;
private static final int PORT_MINIMUM = 1_024;
private final Random random;
RandomNameFactory(Random random) {
this.random = random;
}
@Override
public String getIpAddress() {
try {
return InetAddress.getByName(String.format("169.254.%d.%d", 1 + this.random.nextInt(254), this.random.nextInt(256))).getHostAddress();
} catch (UnknownHostException e) {
throw Exceptions.propagate(e);
}
}
@Override
public String getName(String prefix) {
return String.format("%s%s", prefix, new BigInteger(25, this.random).toString(32));
}
@Override
public int getPort() {
return PORT_MINIMUM + this.random.nextInt(PORT_MAXIMUM - PORT_MINIMUM);
}
@Override
public boolean isIpAddress(String candidate) {
try {
return InetAddress.getByName(candidate).isLinkLocalAddress();
} catch (UnknownHostException e) {
return false;
}
}
@Override
public boolean isName(String prefix, String candidate) {
return candidate != null && candidate.startsWith(prefix);
}
@Override
public boolean isPort(int candidate) {
return candidate >= PORT_MINIMUM && candidate <= PORT_MAXIMUM;
}
}