// --- 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.io.InputStream;
import java.io.OutputStream;
import java.lang.reflect.Array;
import java.util.Enumeration;
import java.util.Vector;

import netscape.security.util.DerOutputStream;
import netscape.security.util.DerValue;
import netscape.security.util.ObjectIdentifier;
 
/**
 * This class defines the Certificate Policies Extension.
 * 
 * <p>The certificate policies extension conatins a sequence of policy
 * information terms, each of which consists of an object identifier
 * (OID) and optional qualifiers. These policy information terms
 * indicate the policy under which the certificate has been issued and
 * the purposes for which the certificate may be used. Aplications with
 * specific policy requirements are expected to have a list of those
 * policies which they will accept and to compare the policy OIDs in the
 * certificate to that list. If this extension is critical, the path
 * validation software must be able to interpret this extension, or must
 * reject the certificate. 
 *
 * <pre>
 * CertificatePolicies ::= SEQUENECE OF PolicyInformation
 * </pre>
 *
 *@author Christine Ho
 *@see Extension
 *@see CertAttrSet
 */
public class CertificatePoliciesExtension 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.CertificatePolicies";
    /**
     * Attribute names.
     */
    public static final String NAME = "CertificatePolicies";
    public static final String INFOS = "infos"; 


    // Private data members 
    private Vector mInfos;
 
    // Encode this extension value
    private void encodeThis() throws IOException {
        DerOutputStream os = new DerOutputStream();
        DerOutputStream tmp = new DerOutputStream();
 
        for (int i = 0; i < mInfos.size(); i++) {
            ((CertificatePolicyInfo)mInfos.elementAt(i)).encode(tmp);
        }
        os.write(DerValue.tag_Sequence,tmp);
        extensionValue = os.toByteArray();
    }

    public CertificatePoliciesExtension(boolean critical, Vector infos) throws IOException {
        this.mInfos = infos;
        this.extensionId = PKIXExtensions.CertificatePolicies_Id;
        this.critical = critical;
        encodeThis();
    }

    /**
     * Create a CertificatePolicies  with the Vector of CertificatePolicyInfo.
     *
     * @param infos the Vector of CertificatePolicyInfo.
     */
    public CertificatePoliciesExtension(Vector infos) throws IOException {
        this.mInfos = infos;
        this.extensionId = PKIXExtensions.CertificatePolicies_Id;
        this.critical = false;
        encodeThis();
    }
 
    /**
     * Create a default CertificatePoliciesExtension.
     */
	public CertificatePoliciesExtension() {
        this.extensionId = PKIXExtensions.CertificatePolicies_Id; 
        critical = false;
        mInfos  = new Vector(1,1);
    }

    /**
     * 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 CertificatePoliciesExtension(Boolean critical, Object value)
    throws IOException {
		this.extensionId = PKIXExtensions.CertificatePolicies_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.tag != DerValue.tag_Sequence) {
            throw new IOException("Invalid encoding for " +
                                  "CertificatePoliciesExtension.");
        }
        mInfos = new Vector(1, 1);
        while (val.data.available() != 0) {
            DerValue seq = val.data.getDerValue();
            CertificatePolicyInfo info = new CertificatePolicyInfo(seq);
            mInfos.addElement(info);
        }
    }

    /**
     * Returns a printable representation of the policy extension.
     */
    public String toString() {
        if (mInfos == null) return "";
        String s = super.toString() + "Certificate Policies [\n"
                 + mInfos.toString() + "]\n";
 
        return (s);
    }
 
    /**
     * 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.CertificatePolicies_Id;
            critical = false;
            encodeThis();
        }
        super.encode(tmp);
        out.write(tmp.toByteArray());
    }

    /**
     * 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.");
    }
 
    /**
     * Set the attribute value.
     */
    public void set(String name, Object obj) throws IOException {
        clearValue();
        if (name.equalsIgnoreCase(INFOS)) {
            if (!(obj instanceof Vector)) {
              throw new IOException("Attribute value should be of" +
                                    " type Vector.");
            }
            mInfos = (Vector)obj;
        } else {
          throw new IOException("Attribute name not recognized by " +
                        "CertAttrSet:CertificatePoliciesExtension.");
        }
    }
 
    /**
     * Get the attribute value.
     */
    public Object get(String name) throws IOException {
        if (name.equalsIgnoreCase(INFOS)) {
            return (mInfos);
        } else {
          throw new IOException("Attribute name not recognized by " +
                        "CertAttrSet:CertificatePoliciesExtension.");
        }
    }
 
    /**
     * Delete the attribute value.
     */
    public void delete(String name) throws IOException {
        if (name.equalsIgnoreCase(INFOS)) {
            mInfos = null;
        } else {
          throw new IOException("Attribute name not recognized by " +
                        "CertAttrSet:CertificatePoliciesExtension.");
        }
    }
 
    /**
     * Return an enumeration of names of attributes existing within this
     * attribute.
     */
    public Enumeration getElements () {
        AttributeNameEnumeration elements = new AttributeNameEnumeration();
        elements.addElement(mInfos);
        return (elements.elements());
    }
 
    /**
     * Return the name of this attribute.
     */
    public String getName () {
        return (NAME);
    }

    	public static void main(String args[])
	{

/** From ASN.1 dump

  0 30  133: SEQUENCE {
   3 30   45: . SEQUENCE {
   5 06    3: . . OBJECT IDENTIFIER '1 2 3 5'
  10 30   38: . . SEQUENCE {
  12 30   36: . . . SEQUENCE {
  14 06    8: . . . . OBJECT IDENTIFIER cps (1 3 6 1 5 5 7 2 1)
            : . . . . . (PKIX policy qualifier)
  24 16   24: . . . . IA5String 'http://home.netscape.com'
            : . . . . }
            : . . . }
            : . . }
  50 30   84: . SEQUENCE {
  52 06    2: . . OBJECT IDENTIFIER '2 3 5'
  56 30   78: . . SEQUENCE {
  58 30   36: . . . SEQUENCE {
  60 06    8: . . . . OBJECT IDENTIFIER cps (1 3 6 1 5 5 7 2 1)
            : . . . . . (PKIX policy qualifier)
  70 16   24: . . . . IA5String 'http://home.netscape.com'
            : . . . . }
  96 30   38: . . . SEQUENCE {
  98 06    8: . . . . OBJECT IDENTIFIER unotice (1 3 6 1 5 5 7 2 2)
            : . . . . . (PKIX policy qualifier)
 108 30   26: . . . . SEQUENCE {
 110 30   16: . . . . . SEQUENCE {
 112 1E    8: . . . . . . BMPString (1993) '_..o.r.g'
 122 02    1: . . . . . . INTEGER 1
 125 02    1: . . . . . . INTEGER 2
            : . . . . . . }
 128 1E    6: . . . . . BMPString (1993) '_..d.t'
            : . . . . . }
            : . . . . }
            : . . . }
            : . . }
            : . }

 **/

		CertificatePolicyId plcyId0 = new CertificatePolicyId(
				new ObjectIdentifier("1.2.3.5")
			);
		PolicyQualifiers qualifiers0 = new PolicyQualifiers();
		CPSuri cpsQualifier0 = new CPSuri("http://home.netscape.com");
		PolicyQualifierInfo qualifierInfo0 = new PolicyQualifierInfo(
				PolicyQualifierInfo.QT_CPS,
				cpsQualifier0
			);
		qualifiers0.add(qualifierInfo0);
		CertificatePolicyInfo info0 = new CertificatePolicyInfo(
			plcyId0, qualifiers0);
		CertificatePolicyId plcyId1 = new CertificatePolicyId(
				new ObjectIdentifier("2.3.5")
			);
		PolicyQualifiers qualifiers1 = new PolicyQualifiers();
		DisplayText org1 = new DisplayText(DisplayText.tag_BMPString, 
			"org");
		int nums[] = {1, 2};
		NoticeReference nr1 = new NoticeReference(org1, nums);
		DisplayText dt1 = new DisplayText(DisplayText.tag_BMPString,
			"dt");
		UserNotice userNotice1 = new UserNotice(nr1, dt1);
		PolicyQualifierInfo qualifierInfo1 = new PolicyQualifierInfo(
				PolicyQualifierInfo.QT_UNOTICE,
				userNotice1
			);
		qualifiers1.add(qualifierInfo0);
		qualifiers1.add(qualifierInfo1);
		CertificatePolicyInfo info1 = new CertificatePolicyInfo(
			plcyId1, qualifiers1);
		Vector infos = new Vector();
		infos.addElement(info0);
		infos.addElement(info1);
		try {
			CertificatePoliciesExtension ext = 
				new CertificatePoliciesExtension(infos);

	              // BASE64 encode the whole thing and write it to stdout
	              System.out.println( com.netscape.osutil.OSUtil.BtoA(ext.getExtensionValue()) );
		} catch (IOException e) {
			System.out.println(e.toString());
		}
	}
}