org.cagrid.security.ssl.proxy.trust.ProxyPolicy.java Source code

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Here is the source code for org.cagrid.security.ssl.proxy.trust.ProxyPolicy.java

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/*
 * Portions of this file Copyright 1999-2005 University of Chicago
 * Portions of this file Copyright 1999-2005 The University of Southern California.
 *
 * This file or a portion of this file is licensed under the
 * terms of the Globus Toolkit Public License, found at
 * http://www.globus.org/toolkit/download/license.html.
 * If you redistribute this file, with or without
 * modifications, you must include this notice in the file.
 */
package org.cagrid.security.ssl.proxy.trust;

import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.DEREncodable;
import org.bouncycastle.asn1.DERObject;
import org.bouncycastle.asn1.DERObjectIdentifier;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.DERTaggedObject;

/**
 * Represents the policy part of the ProxyCertInfo extension. <BR>
 * 
 * <PRE>
 * ProxyPolicy ::= SEQUENCE {
 *    policyLanguage    OBJECT IDENTIFIER,
 *    policy            OCTET STRING OPTIONAL }
 * </PRE>
 */
public class ProxyPolicy implements DEREncodable {

    /** Impersonation proxy OID */
    public static final DERObjectIdentifier IMPERSONATION = new DERObjectIdentifier("1.3.6.1.5.5.7.21.1");

    /** Independent proxy OID */
    public static final DERObjectIdentifier INDEPENDENT = new DERObjectIdentifier("1.3.6.1.5.5.7.21.2");

    /** Limited proxy OID */
    public static final DERObjectIdentifier LIMITED = new DERObjectIdentifier("1.3.6.1.4.1.3536.1.1.1.9");

    private DERObjectIdentifier policyLanguage;
    private DEROctetString policy;

    /**
     * Creates a new instance of the ProxyPolicy object from given ASN1Sequence
     * object.
     * 
     * @param seq
     *            ASN1Sequence object to create the instance from.
     */
    public ProxyPolicy(ASN1Sequence seq) {
        if (seq.size() < 1) {
            throw new IllegalArgumentException("Invalid sequence");
        }
        this.policyLanguage = (DERObjectIdentifier) seq.getObjectAt(0);
        if (seq.size() > 1) {
            DEREncodable obj = seq.getObjectAt(1);
            if (obj instanceof DERTaggedObject) {
                obj = ((DERTaggedObject) obj).getObject();
            }
            this.policy = (DEROctetString) obj;
        }
        checkConstraints();
    }

    /**
     * Returns the DER-encoded ASN.1 representation of proxy policy.
     * 
     * @return <code>DERObject</code> the encoded representation of the proxy
     *         policy.
     */
    public DERObject getDERObject() {
        ASN1EncodableVector vec = new ASN1EncodableVector();

        vec.add(this.policyLanguage);

        if (this.policy != null) {
            vec.add(this.policy);
        }

        return new DERSequence(vec);
    }

    /**
     * Creates a new instance of the ProxyPolicy object.
     * 
     * @param policyLanguage
     *            the language policy Oid.
     * @param policy
     *            the policy.
     */
    public ProxyPolicy(DERObjectIdentifier policyLanguage, byte[] policy) {
        if (policyLanguage == null) {
            throw new IllegalArgumentException("Policy langauge oid required");
        }
        this.policyLanguage = policyLanguage;
        if (policy != null) {
            this.policy = new DEROctetString(policy);
        }
        checkConstraints();
    }

    /**
     * Creates a new instance of the ProxyPolicy object.
     * 
     * @param policyLanguageOid
     *            the language policy Oid.
     * @param policy
     *            the policy.
     */
    public ProxyPolicy(String policyLanguageOid, byte[] policy) {
        if (policyLanguageOid == null) {
            throw new IllegalArgumentException("Policy langauge oid required");
        }
        this.policyLanguage = new DERObjectIdentifier(policyLanguageOid);
        if (policy != null) {
            this.policy = new DEROctetString(policy);
        }
        checkConstraints();
    }

    /**
     * Creates a new instance of the ProxyPolicy object.
     * 
     * @param policyLanguage
     *            the language policy Oid.
     * @param policy
     *            the policy.
     */
    public ProxyPolicy(DERObjectIdentifier policyLanguage, String policy) {
        this(policyLanguage, (policy != null) ? policy.getBytes() : null);
    }

    /**
     * Creates a new instance of the ProxyPolicy object with no policy.
     * 
     * @param policyLanguage
     *            the language policy Oid.
     */
    public ProxyPolicy(DERObjectIdentifier policyLanguage) {
        this(policyLanguage, (byte[]) null);
    }

    protected void checkConstraints() {
        if ((this.policyLanguage.equals(IMPERSONATION) || this.policyLanguage.equals(INDEPENDENT))
                && this.policy != null) {
            throw new IllegalArgumentException("Constrains violation.");
        }
    }

    /**
     * Returns the actual policy embedded in the ProxyPolicy object.
     * 
     * @return the policy in bytes. Might be null.
     */
    public byte[] getPolicy() {
        return (this.policy != null) ? this.policy.getOctets() : null;
    }

    /**
     * Returns the actual policy embedded in the ProxyPolicy object.
     * 
     * @return the policy as String. Might be null.
     */
    public String getPolicyAsString() {
        return (this.policy != null) ? new String(this.policy.getOctets()) : null;
    }

    /**
     * Returns the policy language of the ProxyPolicy.
     * 
     * @return the policy language Oid.
     */
    public DERObjectIdentifier getPolicyLanguage() {
        return this.policyLanguage;
    }

    public String toString() {
        StringBuffer buf = new StringBuffer();
        buf.append("ProxyPolicy: ");
        buf.append(this.policyLanguage.getId());
        if (this.policy != null) {
            buf.append(System.getProperty("line.separator"));
            buf.append(getPolicyAsString());
        }
        return buf.toString();
    }

}