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.directory.api.ldap.model.schema.syntaxCheckers;
21
22
23 import org.apache.directory.api.asn1.util.Oid;
24 import org.apache.directory.api.ldap.model.constants.SchemaConstants;
25 import org.apache.directory.api.ldap.model.schema.SyntaxChecker;
26 import org.apache.directory.api.util.Strings;
27 import org.slf4j.Logger;
28 import org.slf4j.LoggerFactory;
29
30
31 /**
32 * A SyntaxChecker which verifies that a value is a numeric oid and a length
33 * constraint according to RFC 4512.
34 *
35 * From RFC 4512 :
36 *
37 * noidlen = numericoid [ LCURLY len RCURLY ]
38 * numericoid = number 1*( DOT number )
39 * len = number
40 * number = DIGIT | ( LDIGIT 1*DIGIT )
41 * DIGIT = %x30 | LDIGIT ; "0"-"9"
42 * LDIGIT = %x31-39 ; "1"-"9"
43 * DOT = %x2E ; period (".")
44 * LCURLY = %x7B ; left curly brace "{"
45 * RCURLY = %x7D ; right curly brace "}"
46 *
47 *
48 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
49 */
50 @SuppressWarnings("serial")
51 public class OidLenSyntaxChecker extends SyntaxChecker
52 {
53 /** A logger for this class */
54 private static final Logger LOG = LoggerFactory.getLogger( OidLenSyntaxChecker.class );
55
56
57 /**
58 *
59 * Creates a new instance of OidLenSyntaxChecker.
60 *
61 */
62 public OidLenSyntaxChecker()
63 {
64 super( SchemaConstants.OID_LEN_SYNTAX );
65 }
66
67
68 /**
69 * {@inheritDoc}
70 */
71 public boolean isValidSyntax( Object value )
72 {
73 String strValue = null;
74
75 if ( value == null )
76 {
77 LOG.debug( "Syntax invalid for 'null'" );
78 return false;
79 }
80
81 if ( value instanceof String )
82 {
83 strValue = ( String ) value;
84 }
85 else if ( value instanceof byte[] )
86 {
87 strValue = Strings.utf8ToString( ( byte[] ) value );
88 }
89 else
90 {
91 strValue = value.toString();
92 }
93
94 if ( strValue.length() == 0 )
95 {
96 LOG.debug( "Syntax invalid for '{}'", value );
97 return false;
98 }
99
100 // We are looking at the first position of the len part
101 int pos = strValue.indexOf( '{' );
102
103 if ( pos < 0 )
104 {
105 // Not found ... but it may still be a valid OID
106 boolean result = Oid.isOid( strValue );
107
108 if ( result )
109 {
110 LOG.debug( "Syntax valid for '{}'", value );
111 }
112 else
113 {
114 LOG.debug( "Syntax invalid for '{}'", value );
115 }
116
117 return result;
118 }
119 else
120 {
121 // we should have a len value. First check that the OID is valid
122 String oid = strValue.substring( 0, pos );
123
124 if ( !Oid.isOid( oid ) )
125 {
126 LOG.debug( "Syntax invalid for '{}'", value );
127 return false;
128 }
129
130 String len = strValue.substring( pos );
131
132 // We must have a lnumber and a '}' at the end
133 if ( len.charAt( len.length() - 1 ) != '}' )
134 {
135 // No final '}'
136 LOG.debug( "Syntax invalid for '{}'", value );
137 return false;
138 }
139
140 for ( int i = 1; i < len.length() - 1; i++ )
141 {
142 switch ( len.charAt( i ) )
143 {
144 case '0':
145 case '1':
146 case '2':
147 case '3':
148 case '4':
149 case '5':
150 case '6':
151 case '7':
152 case '8':
153 case '9':
154 break;
155
156 default:
157 LOG.debug( "Syntax invalid for '{}'", value );
158 return false;
159 }
160 }
161
162 if ( ( len.charAt( 1 ) == '0' ) && len.length() > 3 )
163 {
164 // A number can't start with a '0' unless it's the only
165 // number
166 LOG.debug( "Syntax invalid for '{}'", value );
167 return false;
168 }
169
170 LOG.debug( "Syntax valid for '{}'", value );
171 return true;
172 }
173 }
174 }