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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, software
13   * distributed under the License is distributed on an "AS IS" BASIS,
14   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15   * See the License for the specific language governing permissions and
16   * limitations under the License.
17   */
18  package org.apache.hadoop.hbase.security.visibility;
19  
20  import org.apache.hadoop.classification.InterfaceAudience;
21  
22  /**
23   * A simple validator that validates the labels passed
24   */
25  @InterfaceAudience.Private
26  public class VisibilityLabelsValidator {
27    // We follow Accumulo parity for valid visibility labels.
28    private static final boolean[] validAuthChars = new boolean[256];
29  
30    static {
31      for (int i = 0; i < 256; i++) {
32        validAuthChars[i] = false;
33      }
34  
35      for (int i = 'a'; i <= 'z'; i++) {
36        validAuthChars[i] = true;
37      }
38  
39      for (int i = 'A'; i <= 'Z'; i++) {
40        validAuthChars[i] = true;
41      }
42  
43      for (int i = '0'; i <= '9'; i++) {
44        validAuthChars[i] = true;
45      }
46  
47      validAuthChars['_'] = true;
48      validAuthChars['-'] = true;
49      validAuthChars[':'] = true;
50      validAuthChars['.'] = true;
51      validAuthChars['/'] = true;
52    }
53    
54    static final boolean isValidAuthChar(byte b) {
55      return validAuthChars[0xff & b];
56    }
57  
58    static final boolean isValidLabel(byte[] label) {
59      for (int i = 0; i < label.length; i++) {
60        if (!isValidAuthChar(label[i])) {
61          return false;
62        }
63      }
64      return true;
65    }
66  }