| 1 | /**************************************************************** |
| 2 | * Licensed to the Apache Software Foundation (ASF) under one * |
| 3 | * or more contributor license agreements. See the NOTICE file * |
| 4 | * distributed with this work for additional information * |
| 5 | * regarding copyright ownership. The ASF 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 | |
| 20 | package org.apache.james.jdkim.impl; |
| 21 | |
| 22 | import java.util.ArrayList; |
| 23 | import java.util.Iterator; |
| 24 | import java.util.List; |
| 25 | |
| 26 | import org.apache.james.jdkim.api.PublicKeyRecordRetriever; |
| 27 | import org.apache.james.jdkim.exceptions.PermFailException; |
| 28 | import org.apache.james.jdkim.exceptions.TempFailException; |
| 29 | import org.xbill.DNS.Lookup; |
| 30 | import org.xbill.DNS.Record; |
| 31 | import org.xbill.DNS.Resolver; |
| 32 | import org.xbill.DNS.TXTRecord; |
| 33 | import org.xbill.DNS.TextParseException; |
| 34 | import org.xbill.DNS.Type; |
| 35 | |
| 36 | public class DNSPublicKeyRecordRetriever implements PublicKeyRecordRetriever { |
| 37 | |
| 38 | // The resolver used for the lookup |
| 39 | protected Resolver resolver; |
| 40 | |
| 41 | public DNSPublicKeyRecordRetriever() { |
| 42 | this(Lookup.getDefaultResolver()); |
| 43 | } |
| 44 | |
| 45 | public DNSPublicKeyRecordRetriever(Resolver resolver) { |
| 46 | this.resolver = resolver; |
| 47 | } |
| 48 | |
| 49 | /** |
| 50 | * @see org.apache.james.jdkim.api.PublicKeyRecordRetriever#getRecords(java.lang.CharSequence, java.lang.CharSequence, java.lang.CharSequence) |
| 51 | */ |
| 52 | public List/* String */getRecords(CharSequence methodAndOptions, |
| 53 | CharSequence selector, CharSequence token) |
| 54 | throws TempFailException, PermFailException { |
| 55 | if (!"dns/txt".equals(methodAndOptions)) |
| 56 | throw new PermFailException("Only dns/txt is supported: " |
| 57 | + methodAndOptions + " options unsupported."); |
| 58 | try { |
| 59 | Lookup query = new Lookup(selector + "._domainkey." + token, |
| 60 | Type.TXT); |
| 61 | query.setResolver(resolver); |
| 62 | |
| 63 | Record[] rr = query.run(); |
| 64 | int queryResult = query.getResult(); |
| 65 | |
| 66 | if (queryResult == Lookup.TRY_AGAIN) { |
| 67 | throw new TempFailException(query.getErrorString()); |
| 68 | } |
| 69 | |
| 70 | List/* String */records = convertRecordsToList(rr); |
| 71 | return records; |
| 72 | } catch (TextParseException e) { |
| 73 | // TODO log |
| 74 | return null; |
| 75 | } |
| 76 | } |
| 77 | |
| 78 | /** |
| 79 | * Convert the given TXT Record array to a String List |
| 80 | * |
| 81 | * @param rr |
| 82 | * Record array |
| 83 | * @return list |
| 84 | */ |
| 85 | public static List/* String */convertRecordsToList(Record[] rr) { |
| 86 | List/* String */records; |
| 87 | if (rr != null && rr.length > 0) { |
| 88 | records = new ArrayList/* String */(); |
| 89 | for (int i = 0; i < rr.length; i++) { |
| 90 | switch (rr[i].getType()) { |
| 91 | case Type.TXT: |
| 92 | TXTRecord txt = (TXTRecord) rr[i]; |
| 93 | if (txt.getStrings().size() == 1) { |
| 94 | // This was required until dnsjava 2.0.6 because dnsjava |
| 95 | // was escaping |
| 96 | // the result like it was doublequoted (JDKIM-7). |
| 97 | // records.add(((String)txt.getStrings().get(0)).replaceAll("\\\\", |
| 98 | // "")); |
| 99 | records.add(((String) txt.getStrings().get(0))); |
| 100 | } else { |
| 101 | StringBuffer sb = new StringBuffer(); |
| 102 | for (Iterator/* String */it = txt.getStrings() |
| 103 | .iterator(); it.hasNext();) { |
| 104 | String k = (String) it.next(); |
| 105 | // This was required until dnsjava 2.0.6 because |
| 106 | // dnsjava was escaping |
| 107 | // the result like it was doublequoted (JDKIM-7). |
| 108 | // k = k.replaceAll("\\\\", ""); |
| 109 | sb.append(k); |
| 110 | } |
| 111 | records.add(sb.toString()); |
| 112 | } |
| 113 | break; |
| 114 | default: |
| 115 | return null; |
| 116 | } |
| 117 | } |
| 118 | } else { |
| 119 | records = null; |
| 120 | } |
| 121 | return records; |
| 122 | } |
| 123 | |
| 124 | } |