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	/*
	* Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code 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. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code 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 in the LICENSE file that
	* accompanied this code).
	*
	* 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	package sun.security.x509;

	import java.io.IOException;
	import java.io.OutputStream;
	import java.util.Enumeration;

	import sun.security.util.*;

	/**
	* This class defines the certificate extension which specifies the
	* Policy constraints.
	* <p>
	* The policy constraints extension can be used in certificates issued
	* to CAs. The policy constraints extension constrains path validation
	* in two ways. It can be used to prohibit policy mapping or require
	* that each certificate in a path contain an acceptable policy
	* identifier.<p>
	* The ASN.1 syntax for this is (IMPLICIT tagging is defined in the
	* module definition):
	* <pre>
	* PolicyConstraints ::= SEQUENCE {
	* requireExplicitPolicy [0] SkipCerts OPTIONAL,
	* inhibitPolicyMapping [1] SkipCerts OPTIONAL
	* }
	* SkipCerts ::= INTEGER (0..MAX)
	* </pre>
	* @author Amit Kapoor
	* @author Hemma Prafullchandra
	* @see Extension
	* @see CertAttrSet
	*/
	public class PolicyConstraintsExtension 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.PolicyConstraints";
	/**
	* Attribute names.
	*/
	public static final String NAME = "PolicyConstraints";
	public static final String REQUIRE = "require";
	public static final String INHIBIT = "inhibit";

	private static final byte TAG_REQUIRE = 0;
	private static final byte TAG_INHIBIT = 1;

	private int require = -1;
	private int inhibit = -1;

	// Encode this extension value.
	private void encodeThis() throws IOException {
	if (require == -1 && inhibit == -1) {
	this.extensionValue = null;
	return;
	}
	DerOutputStream tagged = new DerOutputStream();
	DerOutputStream seq = new DerOutputStream();

	if (require != -1) {
	DerOutputStream tmp = new DerOutputStream();
	tmp.putInteger(require);
	tagged.writeImplicit(DerValue.createTag(DerValue.TAG_CONTEXT,
	false, TAG_REQUIRE), tmp);
	}
	if (inhibit != -1) {
	DerOutputStream tmp = new DerOutputStream();
	tmp.putInteger(inhibit);
	tagged.writeImplicit(DerValue.createTag(DerValue.TAG_CONTEXT,
	false, TAG_INHIBIT), tmp);
	}
	seq.write(DerValue.tag_Sequence, tagged);
	this.extensionValue = seq.toByteArray();
	}

	/**
	* Create a PolicyConstraintsExtension object with both
	* require explicit policy and inhibit policy mapping. The
	* extension is marked non-critical.
	*
	* @param require require explicit policy (-1 for optional).
	* @param inhibit inhibit policy mapping (-1 for optional).
	*/
	public PolicyConstraintsExtension(int require, int inhibit)
	throws IOException {
	this(Boolean.TRUE, require, inhibit);
	}

	/**
	* Create a PolicyConstraintsExtension object with specified
	* criticality and both require explicit policy and inhibit
	* policy mapping.
	*
	* @param critical true if the extension is to be treated as critical.
	* @param require require explicit policy (-1 for optional).
	* @param inhibit inhibit policy mapping (-1 for optional).
	*/
	public PolicyConstraintsExtension(Boolean critical, int require, int inhibit)
	throws IOException {
	this.require = require;
	this.inhibit = inhibit;
	this.extensionId = PKIXExtensions.PolicyConstraints_Id;
	this.critical = critical.booleanValue();
	encodeThis();
	}

	/**
	* Create the extension from its DER encoded value and criticality.
	*
	* @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 PolicyConstraintsExtension(Boolean critical, Object value)
	throws IOException {
	this.extensionId = PKIXExtensions.PolicyConstraints_Id;
	this.critical = critical.booleanValue();

	this.extensionValue = (byte[]) value;
	DerValue val = new DerValue(this.extensionValue);
	if (val.tag != DerValue.tag_Sequence) {
	throw new IOException("Sequence tag missing for PolicyConstraint.");
	}
	DerInputStream in = val.data;
	while (in != null && in.available() != 0) {
	DerValue next = in.getDerValue();

	if (next.isContextSpecific(TAG_REQUIRE) && !next.isConstructed()) {
	if (this.require != -1)
	throw new IOException("Duplicate requireExplicitPolicy" +
	"found in the PolicyConstraintsExtension");
	next.resetTag(DerValue.tag_Integer);
	this.require = next.getInteger();

	} else if (next.isContextSpecific(TAG_INHIBIT) &&
	!next.isConstructed()) {
	if (this.inhibit != -1)
	throw new IOException("Duplicate inhibitPolicyMapping" +
	"found in the PolicyConstraintsExtension");
	next.resetTag(DerValue.tag_Integer);
	this.inhibit = next.getInteger();
	} else
	throw new IOException("Invalid encoding of PolicyConstraint");
	}
	}

	/**
	* Return the extension as user readable string.
	*/
	public String toString() {
	StringBuilder sb = new StringBuilder();
	sb.append(super.toString())
	.append("PolicyConstraints: [")
	.append(" Require: ");
	if (require == -1) {
	sb.append("unspecified;");
	} else {
	sb.append(require)
	.append(';');
	}
	sb.append("\tInhibit: ");
	if (inhibit == -1) {
	sb.append("unspecified");
	} else {
	sb.append(inhibit);
	}
	sb.append(" ]\n");
	return sb.toString();
	}

	/**
	* Write the extension to the DerOutputStream.
	*
	* @param out the DerOutputStream 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.PolicyConstraints_Id;
	critical = true;
	encodeThis();
	}
	super.encode(tmp);
	out.write(tmp.toByteArray());
	}

	/**
	* Set the attribute value.
	*/
	public void set(String name, Object obj) throws IOException {
	if (!(obj instanceof Integer)) {
	throw new IOException("Attribute value should be of type Integer.");
	}
	if (name.equalsIgnoreCase(REQUIRE)) {
	require = ((Integer)obj).intValue();
	} else if (name.equalsIgnoreCase(INHIBIT)) {
	inhibit = ((Integer)obj).intValue();
	} else {
	throw new IOException("Attribute name " + "[" + name + "]" +
	" not recognized by " +
	"CertAttrSet:PolicyConstraints.");
	}
	encodeThis();
	}

	/**
	* Get the attribute value.
	*/
	public Integer get(String name) throws IOException {
	if (name.equalsIgnoreCase(REQUIRE)) {
	return require;
	} else if (name.equalsIgnoreCase(INHIBIT)) {
	return inhibit;
	} else {
	throw new IOException("Attribute name not recognized by " +
	"CertAttrSet:PolicyConstraints.");
	}
	}

	/**
	* Delete the attribute value.
	*/
	public void delete(String name) throws IOException {
	if (name.equalsIgnoreCase(REQUIRE)) {
	require = -1;
	} else if (name.equalsIgnoreCase(INHIBIT)) {
	inhibit = -1;
	} else {
	throw new IOException("Attribute name not recognized by " +
	"CertAttrSet:PolicyConstraints.");
	}
	encodeThis();
	}

	/**
	* Return an enumeration of names of attributes existing within this
	* attribute.
	*/
	public Enumeration<String> getElements() {
	AttributeNameEnumeration elements = new AttributeNameEnumeration();
	elements.addElement(REQUIRE);
	elements.addElement(INHIBIT);

	return (elements.elements());
	}

	/**
	* Return the name of this attribute.
	*/
	public String getName() {
	return (NAME);
	}
	}

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