attributetypeandvalue.java

一个非常好的ssh客户端实现

/******************************************************************************
 *
 * Copyright (c) 1999-2004 AppGate Network Security AB. All Rights Reserved.
 * 
 * This file contains Original Code and/or Modifications of Original Code as
 * defined in and that are subject to the MindTerm Public Source License,
 * Version 2.0, (the 'License'). You may not use this file except in compliance
 * with the License.
 * 
 * You should have received a copy of the MindTerm Public Source License
 * along with this software; see the file LICENSE.  If not, write to
 * AppGate Network Security AB, Otterhallegatan 2, SE-41118 Goteborg, SWEDEN
 *
 *****************************************************************************/

package com.mindbright.security.x509;

import com.mindbright.asn1.ASN1Object;
import com.mindbright.asn1.ASN1Sequence;
import com.mindbright.asn1.ASN1OID;
import com.mindbright.asn1.ASN1OIDRegistry;
import com.mindbright.asn1.ASN1AnyDefinedBy;
import com.mindbright.asn1.ASN1BitString;
import com.mindbright.asn1.ASN1CharString;
import com.mindbright.asn1.ASN1PrintableString;

/**
 * <pre>
 *   AttributeTypeAndValue ::= SEQUENCE {
 *     type     AttributeType,
 *     value    AttributeValue }
 *
 *   AttributeType ::= OBJECT IDENTIFIER
 *
 *   AttributeValue ::= ANY DEFINED BY AttributeType
 * </pre>
 */
public final class AttributeTypeAndValue extends ASN1Sequence {

    public ASN1OID          type;
    public ASN1AnyDefinedBy value;

    public AttributeTypeAndValue() {
	type  = new ASN1OID();
	value = new ASN1AnyDefinedBy(type, true);
	addComponent(type);
	addComponent(value);
    }

    public String getRFC2253Value() {
	String typeOID  = type.getString();
	String typeName = ASN1OIDRegistry.lookupShortName(typeOID);
	if(typeName == null) {
	    typeName = ASN1OIDRegistry.lookupName(typeOID);
	}
	if(typeName == null) {
	    typeName = typeOID;
	}
	// TODO should encode as octetstring if type name not known
	return typeName + "=" + valueAsString();
    }

    private String valueAsString() {
	ASN1Object vo = value.getValue();
	String     vs = "<unknown>";
	if(vo instanceof DirectoryString) {
	    vs = ((DirectoryString)vo).getString();
	} else if(vo instanceof ASN1CharString) {
	    vs = ((ASN1CharString)vo).getValue();
	} else if(vo instanceof ASN1PrintableString) {
	    vs = ((ASN1PrintableString)vo).getValue();
	} else if(vo instanceof ASN1BitString) {
	    vs = ((ASN1BitString)vo).toPrintableString();
	} // else { TODO, encode as octetstring
	// TODO, escape characters according to rfc2253

	return vs;
    }

}