/*
* 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.jclouds.predicates.validators;
import static com.google.common.base.CharMatcher.inRange;
import static com.google.common.base.CharMatcher.is;
import javax.inject.Inject;
import javax.inject.Named;
import org.jclouds.predicates.Validator;
import com.google.common.base.CharMatcher;
import com.google.inject.Singleton;
/**
* Validates name for dns-style names
*
* @see org.jclouds.rest.InputParamValidator
* @see org.jclouds.predicates.Validator
*/
@Singleton
public class DnsNameValidator extends Validator<String> {
private int min;
private int max;
@Inject
public DnsNameValidator(@Named("jclouds.dns_name_length_min") int min,
@Named("jclouds.dns_name_length_max") int max) {
this.min = min;
this.max = max;
}
public void validate(String name) {
if (name == null || name.length() < min || name.length() > max)
throw exception(name, "Can't be null or empty. Length must be " + min + " to " + max
+ " symbols.");
if (CharMatcher.JAVA_LETTER_OR_DIGIT.indexIn(name) != 0)
throw exception(name, "Should start with letter/number");
if (!name.toLowerCase().equals(name))
throw exception(name, "Should be only lowercase");
/*
* The name must be a valid DNS name. From wikipedia: "The characters allowed in a label are a
* subset of the ASCII character set, a and includes the characters a through z, A through Z,
* digits 0 through 9". From Azure: Every Dash (-) Must Be Immediately Preceded and Followed
* by a Letter or Number.
*/
CharMatcher range = getAcceptableRange();
if (!range.matchesAllOf(name))
throw exception(name, "Should have lowercase ASCII letters, " + "numbers, or dashes");
}
protected CharMatcher getAcceptableRange() {
return inRange('a', 'z').or(inRange('0', '9').or(is('-')));
}
protected IllegalArgumentException exception(String vAppName, String reason) {
return new IllegalArgumentException(String.format(
"Object '%s' doesn't match dns naming constraints. " + "Reason: %s.", vAppName,
reason));
}
}