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1   /*
2    * Copyright 2014 The Netty Project
3    *
4    * The Netty Project licenses this file to you under the Apache License,
5    * version 2.0 (the "License"); you may not use this file except in compliance
6    * with the License. You may obtain a copy of the License at:
7    *
8    *   http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13   * License for the specific language governing permissions and limitations
14   * under the License.
15   */
16  package io.netty.handler.ssl;
17  
18  import java.util.ArrayList;
19  import java.util.List;
20  import java.util.Set;
21  
22  /**
23   * This class will not do any filtering of ciphers suites.
24   */
25  public final class IdentityCipherSuiteFilter implements CipherSuiteFilter {
26  
27      /**
28       * Defaults to default ciphers when provided ciphers are null
29       */
30      public static final IdentityCipherSuiteFilter INSTANCE = new IdentityCipherSuiteFilter(true);
31  
32      /**
33       * Defaults to supported ciphers when provided ciphers are null
34       */
35      public static final IdentityCipherSuiteFilter INSTANCE_DEFAULTING_TO_SUPPORTED_CIPHERS =
36              new IdentityCipherSuiteFilter(false);
37  
38      private final boolean defaultToDefaultCiphers;
39  
40      private IdentityCipherSuiteFilter(boolean defaultToDefaultCiphers) {
41          this.defaultToDefaultCiphers = defaultToDefaultCiphers;
42      }
43  
44      @Override
45      public String[] filterCipherSuites(Iterable<String> ciphers, List<String> defaultCiphers,
46              Set<String> supportedCiphers) {
47          if (ciphers == null) {
48              return defaultToDefaultCiphers ?
49                      defaultCiphers.toArray(new String[0]) :
50                      supportedCiphers.toArray(new String[0]);
51          } else {
52              List<String> newCiphers = new ArrayList<String>(supportedCiphers.size());
53              for (String c : ciphers) {
54                  if (c == null) {
55                      break;
56                  }
57                  newCiphers.add(c);
58              }
59              return newCiphers.toArray(new String[0]);
60          }
61      }
62  }