/*
* @(#)IssuerAlternativeNameExtension.java 1.19 06/10/10
*
* Copyright 1990-2008 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 only, as published by the Free Software Foundation.
*
* 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 version 2 for more details (a copy is
* included at /legal/license.txt).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this work; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
* Clara, CA 95054 or visit www.sun.com if you need additional
* information or have any questions.
*
*/
package sun.security.x509;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.reflect.Array;
import java.util.Enumeration;
import sun.security.util.*;
/**
* This represents the Issuer Alternative Name Extension.
*
* This extension, if present, allows the issuer to specify multiple
* alternative names.
*
* <p>Extensions are represented as a sequence of the extension identifier
* (Object Identifier), a boolean flag stating whether the extension is to
* be treated as being critical and the extension value itself (this is again
* a DER encoding of the extension value).
*
* @author Amit Kapoor
* @author Hemma Prafullchandra
* @version 1.12
* @see Extension
* @see CertAttrSet
*/
public class IssuerAlternativeNameExtension
extends Extension implements CertAttrSet {
/**
* Identifier for this attribute, to be used with the
* get, set, delete methods of Certificate, x509 type.
*/
public static final String IDENT =
"x509.info.extensions.IssuerAlternativeName";
/**
* Attribute names.
*/
public static final String NAME = "IssuerAlternativeName";
public static final String ISSUER_NAME = "issuer_name";
// private data members
GeneralNames names = null;
// Encode this extension
private void encodeThis() throws IOException {
if (names == null || names.isEmpty()) {
this.extensionValue = null;
return;
}
DerOutputStream os = new DerOutputStream();
names.encode(os);
this.extensionValue = os.toByteArray();
}
/**
* Create a IssuerAlternativeNameExtension with the passed GeneralNames.
*
* @param names the GeneralNames for the issuer.
* @exception IOException on error.
*/
public IssuerAlternativeNameExtension(GeneralNames names)
throws IOException {
this.names = names;
this.extensionId = PKIXExtensions.IssuerAlternativeName_Id;
this.critical = false;
encodeThis();
}
/**
* Create a default IssuerAlternativeNameExtension.
*/
public IssuerAlternativeNameExtension() {
extensionId = PKIXExtensions.IssuerAlternativeName_Id;
critical = false;
names = new GeneralNames();
}
/**
* Create the extension from the passed DER encoded value.
*
* @param critical true if the extension is to be treated as critical.
* @param value Array of DER encoded bytes of the actual value.
* @exception IOException on error.
*/
public IssuerAlternativeNameExtension(Boolean critical, Object value)
throws IOException {
this.extensionId = PKIXExtensions.IssuerAlternativeName_Id;
this.critical = critical.booleanValue();
int len = Array.getLength(value);
byte[] extValue = new byte[len];
for (int i = 0; i < len; i++) {
extValue[i] = Array.getByte(value, i);
}
this.extensionValue = extValue;
DerValue val = new DerValue(extValue);
if (val.data == null) {
names = new GeneralNames();
return;
}
names = new GeneralNames(val);
}
/**
* Returns a printable representation of the IssuerAlternativeName.
*/
public String toString() {
return super.toString() + "IssuerAlternativeName [\n"
+ String.valueOf(names) + "]\n";
}
/**
* Decode the extension from the InputStream.
*
* @param in the InputStream to unmarshal the contents from.
* @exception IOException on decoding or validity errors.
*/
public void decode(InputStream in) throws IOException {
throw new IOException("Method not to be called directly.");
}
/**
* Write the extension to the OutputStream.
*
* @param out the OutputStream to write the extension to.
* @exception IOException on encoding error.
*/
public void encode(OutputStream out) throws IOException {
DerOutputStream tmp = new DerOutputStream();
if (extensionValue == null) {
extensionId = PKIXExtensions.IssuerAlternativeName_Id;
critical = false;
encodeThis();
}
super.encode(tmp);
out.write(tmp.toByteArray());
}
/**
* Set the attribute value.
*/
public void set(String name, Object obj) throws IOException {
if (name.equalsIgnoreCase(ISSUER_NAME)) {
if (!(obj instanceof GeneralNames)) {
throw new IOException("Attribute value should be of" +
" type GeneralNames.");
}
names = (GeneralNames)obj;
} else {
throw new IOException("Attribute name not recognized by " +
"CertAttrSet:IssuerAlternativeName.");
}
encodeThis();
}
/**
* Get the attribute value.
*/
public Object get(String name) throws IOException {
if (name.equalsIgnoreCase(ISSUER_NAME)) {
return (names);
} else {
throw new IOException("Attribute name not recognized by " +
"CertAttrSet:IssuerAlternativeName.");
}
}
/**
* Delete the attribute value.
*/
public void delete(String name) throws IOException {
if (name.equalsIgnoreCase(ISSUER_NAME)) {
names = null;
} else {
throw new IOException("Attribute name not recognized by " +
"CertAttrSet:IssuerAlternativeName.");
}
encodeThis();
}
/**
* Return an enumeration of names of attributes existing within this
* attribute.
*/
public Enumeration getElements() {
AttributeNameEnumeration elements = new AttributeNameEnumeration();
elements.addElement(ISSUER_NAME);
return (elements.elements());
}
/**
* Return the name of this attribute.
*/
public String getName() {
return (NAME);
}
}