| 1 | /** |
| 2 | * Licensed to jclouds, Inc. (jclouds) under one or more |
| 3 | * contributor license agreements. See the NOTICE file |
| 4 | * distributed with this work for additional information |
| 5 | * regarding copyright ownership. jclouds licenses this file |
| 6 | * to you under the Apache License, Version 2.0 (the |
| 7 | * "License"); you may not use this file except in compliance |
| 8 | * with the License. You may obtain a copy of the License at |
| 9 | * |
| 10 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 11 | * |
| 12 | * Unless required by applicable law or agreed to in writing, |
| 13 | * software distributed under the License is distributed on an |
| 14 | * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| 15 | * KIND, either express or implied. See the License for the |
| 16 | * specific language governing permissions and limitations |
| 17 | * under the License. |
| 18 | */ |
| 19 | package org.jclouds.predicates.validators; |
| 20 | |
| 21 | import static com.google.common.base.CharMatcher.inRange; |
| 22 | import static com.google.common.base.CharMatcher.is; |
| 23 | |
| 24 | import javax.inject.Inject; |
| 25 | import javax.inject.Named; |
| 26 | |
| 27 | import org.jclouds.predicates.Validator; |
| 28 | |
| 29 | import com.google.common.base.CharMatcher; |
| 30 | import com.google.inject.Singleton; |
| 31 | |
| 32 | /** |
| 33 | * Validates name for dns-style names |
| 34 | * |
| 35 | * @see org.jclouds.rest.InputParamValidator |
| 36 | * @see org.jclouds.predicates.Validator |
| 37 | * |
| 38 | * @author Adrian Cole |
| 39 | */ |
| 40 | @Singleton |
| 41 | public class DnsNameValidator extends Validator<String> { |
| 42 | private int min; |
| 43 | private int max; |
| 44 | |
| 45 | @Inject |
| 46 | protected DnsNameValidator(@Named("jclouds.dns_name_length_min") int min, |
| 47 | @Named("jclouds.dns_name_length_max") int max) { |
| 48 | this.min = min; |
| 49 | this.max = max; |
| 50 | } |
| 51 | |
| 52 | public void validate(String name) { |
| 53 | |
| 54 | if (name == null || name.length() < min || name.length() > max) |
| 55 | throw exception(name, "Can't be null or empty. Length must be " + min + " to " + max |
| 56 | + " symbols."); |
| 57 | if (CharMatcher.JAVA_LETTER_OR_DIGIT.indexIn(name) != 0) |
| 58 | throw exception(name, "Should start with letter/number"); |
| 59 | if (!name.toLowerCase().equals(name)) |
| 60 | throw exception(name, "Should be only lowercase"); |
| 61 | |
| 62 | /* |
| 63 | * The name must be a valid DNS name. From wikipedia: "The characters allowed in a label are a |
| 64 | * subset of the ASCII character set, a and includes the characters a through z, A through Z, |
| 65 | * digits 0 through 9". From Azure: Every Dash (-) Must Be Immediately Preceded and Followed |
| 66 | * by a Letter or Number. |
| 67 | */ |
| 68 | CharMatcher range = getAcceptableRange(); |
| 69 | if (!range.matchesAllOf(name)) |
| 70 | throw exception(name, "Should have lowercase ASCII letters, " + "numbers, or dashes"); |
| 71 | } |
| 72 | |
| 73 | protected CharMatcher getAcceptableRange() { |
| 74 | return inRange('a', 'z').or(inRange('0', '9').or(is('-'))); |
| 75 | } |
| 76 | |
| 77 | protected IllegalArgumentException exception(String vAppName, String reason) { |
| 78 | return new IllegalArgumentException(String.format( |
| 79 | "Object '%s' doesn't match dns naming constraints. " + "Reason: %s.", vAppName, |
| 80 | reason)); |
| 81 | } |
| 82 | |
| 83 | } |