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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    *   https://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 io.netty.util.internal.EmptyArrays;
19  
20  import java.util.ArrayList;
21  import java.util.List;
22  import java.util.Set;
23  
24  /**
25   * This class will not do any filtering of ciphers suites.
26   */
27  public final class IdentityCipherSuiteFilter implements CipherSuiteFilter {
28  
29      /**
30       * Defaults to default ciphers when provided ciphers are null
31       */
32      public static final IdentityCipherSuiteFilter INSTANCE = new IdentityCipherSuiteFilter(true);
33  
34      /**
35       * Defaults to supported ciphers when provided ciphers are null
36       */
37      public static final IdentityCipherSuiteFilter INSTANCE_DEFAULTING_TO_SUPPORTED_CIPHERS =
38              new IdentityCipherSuiteFilter(false);
39  
40      private final boolean defaultToDefaultCiphers;
41  
42      private IdentityCipherSuiteFilter(boolean defaultToDefaultCiphers) {
43          this.defaultToDefaultCiphers = defaultToDefaultCiphers;
44      }
45  
46      @Override
47      public String[] filterCipherSuites(Iterable<String> ciphers, List<String> defaultCiphers,
48              Set<String> supportedCiphers) {
49          if (ciphers == null) {
50              return defaultToDefaultCiphers ?
51                      defaultCiphers.toArray(EmptyArrays.EMPTY_STRINGS) :
52                      supportedCiphers.toArray(EmptyArrays.EMPTY_STRINGS);
53          } else {
54              List<String> newCiphers = new ArrayList<String>(supportedCiphers.size());
55              for (String c : ciphers) {
56                  if (c == null) {
57                      break;
58                  }
59                  newCiphers.add(c);
60              }
61              return newCiphers.toArray(EmptyArrays.EMPTY_STRINGS);
62          }
63      }
64  }