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5 | * regarding copyright ownership. The ASF licenses this file * |
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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 * |
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16 | * specific language governing permissions and limitations * |
17 | * under the License. * |
18 | ****************************************************************/ |
19 | |
20 | package org.apache.james.jdkim; |
21 | |
22 | import java.io.IOException; |
23 | import java.io.InputStream; |
24 | import java.io.OutputStream; |
25 | import java.security.Signature; |
26 | import java.security.SignatureException; |
27 | import java.util.HashMap; |
28 | import java.util.Iterator; |
29 | import java.util.List; |
30 | import java.util.Map; |
31 | |
32 | import org.apache.james.jdkim.api.Headers; |
33 | import org.apache.james.jdkim.api.SignatureRecord; |
34 | import org.apache.james.jdkim.exceptions.PermFailException; |
35 | |
36 | public abstract class DKIMCommon { |
37 | |
38 | private static final boolean DEEP_DEBUG = false; |
39 | |
40 | protected static void updateSignature(Signature signature, boolean relaxed, |
41 | CharSequence header, String fv) throws SignatureException { |
42 | if (relaxed) { |
43 | if (DEEP_DEBUG) |
44 | System.out |
45 | .println("#" + header.toString().toLowerCase() + ":-"); |
46 | signature.update(header.toString().toLowerCase().getBytes()); |
47 | signature.update(":".getBytes()); |
48 | String headerValue = fv.substring(fv.indexOf(':') + 1); |
49 | headerValue = headerValue.replaceAll("\r\n[\t ]", " "); |
50 | headerValue = headerValue.replaceAll("[\t ]+", " "); |
51 | headerValue = headerValue.trim(); |
52 | signature.update(headerValue.getBytes()); |
53 | if (DEEP_DEBUG) |
54 | System.out.println("#" + headerValue + "#"); |
55 | } else { |
56 | signature.update(fv.getBytes()); |
57 | if (DEEP_DEBUG) |
58 | System.out.println("#" + fv + "#"); |
59 | } |
60 | } |
61 | |
62 | protected static void signatureCheck(Headers h, SignatureRecord sign, |
63 | List headers, Signature signature) |
64 | throws SignatureException, PermFailException { |
65 | |
66 | boolean relaxedHeaders = SignatureRecord.RELAXED.equals(sign |
67 | .getHeaderCanonicalisationMethod()); |
68 | if (!relaxedHeaders |
69 | && !SignatureRecord.SIMPLE.equals(sign |
70 | .getHeaderCanonicalisationMethod())) { |
71 | throw new PermFailException( |
72 | "Unsupported canonicalization algorythm: " |
73 | + sign.getHeaderCanonicalisationMethod()); |
74 | } |
75 | |
76 | // NOTE: this could be improved by using iterators. |
77 | // NOTE: this relies on the list returned by Message being in insertion |
78 | // order |
79 | Map/* String, Integer */processedHeader = new HashMap(); |
80 | |
81 | for (Iterator i = headers.iterator(); i.hasNext();) { |
82 | CharSequence header = (CharSequence) i.next(); |
83 | // NOTE check this getter is case insensitive |
84 | List hl = h.getFields(header.toString()); |
85 | if (hl != null && hl.size() > 0) { |
86 | Integer done = (Integer) processedHeader.get(header.toString()); |
87 | if (done == null) |
88 | done = new Integer(0); /* Integer.valueOf(0) */ |
89 | int doneHeaders = done.intValue() + 1; |
90 | if (doneHeaders <= hl.size()) { |
91 | String fv = (String) hl.get(hl.size() - doneHeaders); |
92 | updateSignature(signature, relaxedHeaders, header, fv); |
93 | signature.update("\r\n".getBytes()); |
94 | processedHeader.put(header.toString(), new Integer( |
95 | doneHeaders)); |
96 | } |
97 | } |
98 | } |
99 | |
100 | String signatureStub = "DKIM-Signature:" + sign.toUnsignedString(); |
101 | updateSignature(signature, relaxedHeaders, "dkim-signature", |
102 | signatureStub); |
103 | } |
104 | |
105 | public static void streamCopy(InputStream bodyIs, OutputStream out) |
106 | throws IOException { |
107 | byte[] buffer = new byte[2048]; |
108 | int read; |
109 | while ((read = bodyIs.read(buffer)) > 0) { |
110 | out.write(buffer, 0, read); |
111 | } |
112 | bodyIs.close(); |
113 | out.close(); |
114 | } |
115 | |
116 | } |