001 /*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements. See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership. The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License. You may obtain a copy of the License at
009 *
010 * http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing,
013 * software distributed under the License is distributed on an
014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 * KIND, either express or implied. See the License for the
016 * specific language governing permissions and limitations
017 * under the License.
018 *
019 */
020 package org.apache.directory.shared.ldap.schema.syntaxCheckers;
021
022
023 import org.apache.directory.shared.asn1.primitives.OID;
024 import org.apache.directory.shared.ldap.constants.SchemaConstants;
025 import org.apache.directory.shared.ldap.schema.SyntaxChecker;
026 import org.apache.directory.shared.ldap.util.StringTools;
027 import org.slf4j.Logger;
028 import org.slf4j.LoggerFactory;
029
030
031 /**
032 * A SyntaxChecker which verifies that a value is a numeric oid and a length
033 * constraint according to RFC 4512.
034 *
035 * From RFC 4512 :
036 *
037 * noidlen = numericoid [ LCURLY len RCURLY ]
038 * numericoid = number 1*( DOT number )
039 * len = number
040 * number = DIGIT | ( LDIGIT 1*DIGIT )
041 * DIGIT = %x30 | LDIGIT ; "0"-"9"
042 * LDIGIT = %x31-39 ; "1"-"9"
043 * DOT = %x2E ; period (".")
044 * LCURLY = %x7B ; left curly brace "{"
045 * RCURLY = %x7D ; right curly brace "}"
046 *
047 *
048 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
049 * @version $Rev$
050 */
051 public class OidLenSyntaxChecker extends SyntaxChecker
052 {
053 /** A logger for this class */
054 private static final Logger LOG = LoggerFactory.getLogger( OidLenSyntaxChecker.class );
055
056 /** The serialVersionUID */
057 private static final long serialVersionUID = 1L;
058
059 /**
060 *
061 * Creates a new instance of OidLenSyntaxChecker.
062 *
063 */
064 public OidLenSyntaxChecker()
065 {
066 super( SchemaConstants.OID_LEN_SYNTAX );
067 }
068
069
070 /**
071 * {@inheritDoc}
072 */
073 public boolean isValidSyntax( Object value )
074 {
075 String strValue = null;
076
077 if ( value == null )
078 {
079 LOG.debug( "Syntax invalid for '{}'", value );
080 return false;
081 }
082
083 if ( value instanceof String )
084 {
085 strValue = ( String ) value;
086 }
087 else if ( value instanceof byte[] )
088 {
089 strValue = StringTools.utf8ToString( ( byte[] ) value );
090 }
091 else
092 {
093 strValue = value.toString();
094 }
095
096 if ( strValue.length() == 0 )
097 {
098 LOG.debug( "Syntax invalid for '{}'", value );
099 return false;
100 }
101
102 // We are looking at the first position of the len part
103 int pos = strValue.indexOf( '{' );
104
105 if ( pos < 0 )
106 {
107 // Not found ... but it may still be a valid OID
108 boolean result = OID.isOID( strValue );
109
110 if ( result )
111 {
112 LOG.debug( "Syntax valid for '{}'", value );
113 }
114 else
115 {
116 LOG.debug( "Syntax invalid for '{}'", value );
117 }
118
119 return result;
120 }
121 else
122 {
123 // we should have a len value. First check that the OID is valid
124 String oid = strValue.substring( 0, pos );
125
126 if ( !OID.isOID( oid ) )
127 {
128 LOG.debug( "Syntax invalid for '{}'", value );
129 return false;
130 }
131
132 String len = strValue.substring( pos );
133
134 // We must have a lnumber and a '}' at the end
135 if ( len.charAt( len.length() -1 ) != '}' )
136 {
137 // No final '}'
138 LOG.debug( "Syntax invalid for '{}'", value );
139 return false;
140 }
141
142 for ( int i = 1; i < len.length() - 1; i++ )
143 {
144 switch ( len.charAt(i) )
145 {
146 case '0': case '1': case '2' : case '3': case '4':
147 case '5': case '6': case '7' : case '8': case '9':
148 break;
149
150 default:
151 LOG.debug( "Syntax invalid for '{}'", value );
152 return false;
153 }
154 }
155
156 if ( ( len.charAt( 1 ) == '0' ) && len.length() > 3 )
157 {
158 // A number can't start with a '0' unless it's the only
159 // number
160 LOG.debug( "Syntax invalid for '{}'", value );
161 return false;
162 }
163
164 LOG.debug( "Syntax valid for '{}'", value );
165 return true;
166 }
167 }
168 }