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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* 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 in the LICENSE file that
* accompanied this code).
*
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* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
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package sun.security.x509;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Enumeration;
import sun.security.util.*;
/**
* This represents the Subject Alternative Name Extension.
*
* This extension, if present, allows the subject 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).
* <p>
* The ASN.1 syntax for this is:
* <pre>
* SubjectAltName ::= GeneralNames
* GeneralNames ::= SEQUENCE SIZE (1..MAX) OF GeneralName
* </pre>
* @author Amit Kapoor
* @author Hemma Prafullchandra
* @see Extension
* @see CertAttrSet
*/
public class SubjectAlternativeNameExtension extends Extension
implements CertAttrSet<String> {
/**
* 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.SubjectAlternativeName";
/**
* Attribute names.
*/
public static final String NAME = "SubjectAlternativeName";
public static final String SUBJECT_NAME = "subject_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 SubjectAlternativeNameExtension with the passed GeneralNames.
* The extension is marked non-critical.
*
* @param names the GeneralNames for the subject.
* @exception IOException on error.
*/
public SubjectAlternativeNameExtension(GeneralNames names)
throws IOException {
this(Boolean.FALSE, names);
}
/**
* Create a SubjectAlternativeNameExtension with the specified
* criticality and GeneralNames.
*
* @param critical true if the extension is to be treated as critical.
* @param names the GeneralNames for the subject.
* @exception IOException on error.
*/
public SubjectAlternativeNameExtension(Boolean critical, GeneralNames names)
throws IOException {
this.names = names;
this.extensionId = PKIXExtensions.SubjectAlternativeName_Id;
this.critical = critical.booleanValue();
encodeThis();
}
/**
* Create a default SubjectAlternativeNameExtension. The extension
* is marked non-critical.
*/
public SubjectAlternativeNameExtension() {
extensionId = PKIXExtensions.SubjectAlternativeName_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 an array of DER encoded bytes of the actual value.
* @exception ClassCastException if value is not an array of bytes
* @exception IOException on error.
*/
public SubjectAlternativeNameExtension(Boolean critical, Object value)
throws IOException {
this.extensionId = PKIXExtensions.SubjectAlternativeName_Id;
this.critical = critical.booleanValue();
this.extensionValue = (byte[]) value;
DerValue val = new DerValue(this.extensionValue);
if (val.data == null) {
names = new GeneralNames();
return;
}
names = new GeneralNames(val);
}
/**
* Returns a printable representation of the SubjectAlternativeName.
*/
public String toString() {
String result = super.toString() + "SubjectAlternativeName [\n";
if(names == null) {
result += " null\n";
} else {
for(GeneralName name: names.names()) {
result += " "+name+"\n";
}
}
result += "]\n";
return result;
}
/**
* Write the extension to the OutputStream.
*
* @param out the OutputStream to write the extension to.
* @exception IOException on encoding errors.
*/
public void encode(OutputStream out) throws IOException {
DerOutputStream tmp = new DerOutputStream();
if (extensionValue == null) {
extensionId = PKIXExtensions.SubjectAlternativeName_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(SUBJECT_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:SubjectAlternativeName.");
}
encodeThis();
}
/**
* Get the attribute value.
*/
public Object get(String name) throws IOException {
if (name.equalsIgnoreCase(SUBJECT_NAME)) {
return (names);
} else {
throw new IOException("Attribute name not recognized by " +
"CertAttrSet:SubjectAlternativeName.");
}
}
/**
* Delete the attribute value.
*/
public void delete(String name) throws IOException {
if (name.equalsIgnoreCase(SUBJECT_NAME)) {
names = null;
} else {
throw new IOException("Attribute name not recognized by " +
"CertAttrSet:SubjectAlternativeName.");
}
encodeThis();
}
/**
* Return an enumeration of names of attributes existing within this
* attribute.
*/
public Enumeration<String> getElements() {
AttributeNameEnumeration elements = new AttributeNameEnumeration();
elements.addElement(SUBJECT_NAME);
return (elements.elements());
}
/**
* Return the name of this attribute.
*/
public String getName() {
return (NAME);
}
}