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// --- BEGIN COPYRIGHT BLOCK ---
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; version 2 of the License.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
// (C) 2007 Red Hat, Inc.
// All rights reserved.
// --- END COPYRIGHT BLOCK ---
package netscape.security.x509;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.CharacterCodingException;
import java.nio.charset.CharsetEncoder;
import netscape.security.util.ASN1CharStrConvMap;
import netscape.security.util.DerValue;
/**
* A DirStrConverter converts a string to a DerValue of ASN.1 Directory String,
* which is a CHOICE of Printable (subset of ASCII), T.61 (Teletex) or
* Universal String (UCS-4), and vice versa.
*
* <p>
* The string to DerValue conversion is done as follows. If the string has only PrintableString characters it is
* converted to a ASN.1 Printable String using the PrintableString encoder from the global default ASN1CharStrConvMap.
* If it has only characters covered in the PrintableString or T.61 character set it is converted to a ASN.1 T.61 string
* using the T.61 encoder from the ASN1CharStrCovnMap. Otherwise it is converted to a ASN.1 UniversalString (UCS-4
* character set) which covers all characters.
*
* @see AVAValueConverter
* @see ASN1CharStrConvMap
*
* @author Lily Hsiao, Slava Galperin at Netscape Communications, Inc.
*/
public class DirStrConverter implements AVAValueConverter {
// public constructors
/**
* Constructs a DirStrConverter.
*/
public DirStrConverter() {
}
// public functions
/**
* Converts a string to a DER encoded ASN1 Directory String, which is a
* CHOICE of PrintableString, T.61String or UniversalString.
* The string is taken as is i.e. should not be in Ldap DN string syntax.
*
* @param ds a string representing a directory string value.
*
* @return a DerValue
*
* @exception IOException if the string cannot be converted, such as
* when a UniversalString encoder
* isn't available and the string contains
* characters covered only in the universal
* string (or UCS-4) character set.
*/
private static byte[] DefEncodingOrder =
new byte[] {
DerValue.tag_PrintableString,
DerValue.tag_T61String,
DerValue.tag_UniversalString
};
public static synchronized void
setDefEncodingOrder(byte[] defEncodingOrder) {
DefEncodingOrder = defEncodingOrder;
}
public DerValue getValue(String ds)
throws IOException {
return getValue(ds, DefEncodingOrder);
}
/**
* Like getValue(String) with specified DER tags as encoding order.
*/
public DerValue getValue(String valueString, byte[] tags) throws IOException {
// try to convert to printable, then t61 the universal -
// i.e. from minimal to the most liberal.
if (tags == null || tags.length == 0)
tags = DefEncodingOrder;
for (int i = 0; i < tags.length; i++) {
try {
CharsetEncoder encoder = ASN1CharStrConvMap.getDefault().getEncoder(tags[i]);
if (encoder == null)
continue;
CharBuffer charBuffer = CharBuffer.wrap(valueString.toCharArray());
ByteBuffer byteBuffer = encoder.encode(charBuffer);
return new DerValue(tags[i], byteBuffer.array(), byteBuffer.arrayOffset(), byteBuffer.limit());
} catch (CharacterCodingException e) {
continue;
}
}
throw new IOException(
"Cannot convert the directory string value to a ASN.1 type");
}
/**
* Creates a DerValue from a BER encoded value, obtained from for example
* a attribute value in octothorpe form of a Ldap DN string.
* Checks if the BER encoded value is legal for a DirectoryString.
*
* NOTE: currently only supports DER encoding for the BER encoded value.
*
* @param berStream Byte array of a BER encoded value.
*
* @return DerValue object.
*
* @exception IOException If the BER value cannot be converted to a
* valid Directory String DER value.
*/
public DerValue getValue(byte[] berByteStream)
throws IOException {
DerValue value = new DerValue(berByteStream);
/*
if (value.tag != DerValue.tag_PrintableString &&
value.tag != DerValue.tag_T61String &&
value.tag != DerValue.tag_UniversalString)
throw new IOException("Invalid Directory String AVA Value");
*/
return value;
}
/**
* Converts a DerValue to a string.
* The string is not in any syntax, such as RFC1779 string syntax.
*
* @param avaValue a DerValue
* @return a string if the value can be converted.
* @exception IOException if a decoder needed for the
* conversion is not available.
*/
public String getAsString(DerValue avaValue)
throws IOException {
/*
if (avaValue.tag != DerValue.tag_PrintableString &&
avaValue.tag != DerValue.tag_BMPString &&
avaValue.tag != DerValue.tag_UniversalString &&
avaValue.tag != DerValue.tag_T61String)
throw new IllegalArgumentException(
"Invalid Directory String value");
// NOTE will return null if a decoder is not available.
*/
return avaValue.getASN1CharString();
}
}
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