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	/*
	* Copyright (c) 1997, 2020, 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.security.cert.*;
	import java.util.Date;
	import java.util.Enumeration;

	import sun.security.util.*;

	/**
	* This class defines the interval for which the certificate is valid.
	*
	* @author Amit Kapoor
	* @author Hemma Prafullchandra
	* @see CertAttrSet
	*/
	public class CertificateValidity 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.validity";
	/**
	* Sub attributes name for this CertAttrSet.
	*/
	public static final String NAME = "validity";
	public static final String NOT_BEFORE = "notBefore";
	public static final String NOT_AFTER = "notAfter";
	/**
	* YR_2050 date and time set to Jan01 00:00 2050 GMT
	*/
	static final long YR_2050 = 2524608000000L;

	// Private data members
	private Date notBefore;
	private Date notAfter;

	// Returns the first time the certificate is valid.
	private Date getNotBefore() {
	return (new Date(notBefore.getTime()));
	}

	// Returns the last time the certificate is valid.
	private Date getNotAfter() {
	return (new Date(notAfter.getTime()));
	}

	// Construct the class from the DerValue
	private void construct(DerValue derVal) throws IOException {
	if (derVal.tag != DerValue.tag_Sequence) {
	throw new IOException("Invalid encoded CertificateValidity, " +
	"starting sequence tag missing.");
	}
	// check if UTCTime encoded or GeneralizedTime
	if (derVal.data.available() == 0)
	throw new IOException("No data encoded for CertificateValidity");

	DerInputStream derIn = new DerInputStream(derVal.toByteArray());
	DerValue[] seq = derIn.getSequence(2);
	if (seq.length != 2)
	throw new IOException("Invalid encoding for CertificateValidity");

	if (seq[0].tag == DerValue.tag_UtcTime) {
	notBefore = derVal.data.getUTCTime();
	} else if (seq[0].tag == DerValue.tag_GeneralizedTime) {
	notBefore = derVal.data.getGeneralizedTime();
	} else {
	throw new IOException("Invalid encoding for CertificateValidity");
	}

	if (seq[1].tag == DerValue.tag_UtcTime) {
	notAfter = derVal.data.getUTCTime();
	} else if (seq[1].tag == DerValue.tag_GeneralizedTime) {
	notAfter = derVal.data.getGeneralizedTime();
	} else {
	throw new IOException("Invalid encoding for CertificateValidity");
	}
	}

	/**
	* Default constructor for the class.
	*/
	public CertificateValidity() { }

	/**
	* The default constructor for this class for the specified interval.
	*
	* @param notBefore the date and time before which the certificate
	* is not valid.
	* @param notAfter the date and time after which the certificate is
	* not valid.
	*/
	public CertificateValidity(Date notBefore, Date notAfter) {
	this.notBefore = notBefore;
	this.notAfter = notAfter;
	}

	/**
	* Create the object, decoding the values from the passed DER stream.
	*
	* @param in the DerInputStream to read the CertificateValidity from.
	* @exception IOException on decoding errors.
	*/
	public CertificateValidity(DerInputStream in) throws IOException {
	DerValue derVal = in.getDerValue();
	construct(derVal);
	}

	/**
	* Return the validity period as user readable string.
	*/
	public String toString() {
	if (notBefore == null \|\| notAfter == null)
	return "";
	return ("Validity: [From: " + notBefore.toString() +
	",\n To: " + notAfter.toString() + "]");
	}

	/**
	* Encode the CertificateValidity period in DER form to the stream.
	*
	* @param out the OutputStream to marshal the contents to.
	* @exception IOException on errors.
	*/
	public void encode(OutputStream out) throws IOException {

	// in cases where default constructor is used check for
	// null values
	if (notBefore == null \|\| notAfter == null) {
	throw new IOException("CertAttrSet:CertificateValidity:" +
	" null values to encode.\n");
	}
	DerOutputStream pair = new DerOutputStream();

	if (notBefore.getTime() < YR_2050) {
	pair.putUTCTime(notBefore);
	} else
	pair.putGeneralizedTime(notBefore);

	if (notAfter.getTime() < YR_2050) {
	pair.putUTCTime(notAfter);
	} else {
	pair.putGeneralizedTime(notAfter);
	}
	DerOutputStream seq = new DerOutputStream();
	seq.write(DerValue.tag_Sequence, pair);

	out.write(seq.toByteArray());
	}

	/**
	* Set the attribute value.
	*/
	public void set(String name, Object obj) throws IOException {
	if (!(obj instanceof Date)) {
	throw new IOException("Attribute must be of type Date.");
	}
	if (name.equalsIgnoreCase(NOT_BEFORE)) {
	notBefore = (Date)obj;
	} else if (name.equalsIgnoreCase(NOT_AFTER)) {
	notAfter = (Date)obj;
	} else {
	throw new IOException("Attribute name not recognized by " +
	"CertAttrSet: CertificateValidity.");
	}
	}

	/**
	* Get the attribute value.
	*/
	public Date get(String name) throws IOException {
	if (name.equalsIgnoreCase(NOT_BEFORE)) {
	return (getNotBefore());
	} else if (name.equalsIgnoreCase(NOT_AFTER)) {
	return (getNotAfter());
	} else {
	throw new IOException("Attribute name not recognized by " +
	"CertAttrSet: CertificateValidity.");
	}
	}

	/**
	* Delete the attribute value.
	*/
	public void delete(String name) throws IOException {
	if (name.equalsIgnoreCase(NOT_BEFORE)) {
	notBefore = null;
	} else if (name.equalsIgnoreCase(NOT_AFTER)) {
	notAfter = null;
	} else {
	throw new IOException("Attribute name not recognized by " +
	"CertAttrSet: CertificateValidity.");
	}
	}

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

	return (elements.elements());
	}

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

	/**
	* Verify that the current time is within the validity period.
	*
	* @exception CertificateExpiredException if the certificate has expired.
	* @exception CertificateNotYetValidException if the certificate is not
	* yet valid.
	*/
	public void valid()
	throws CertificateNotYetValidException, CertificateExpiredException {
	Date now = new Date();
	valid(now);
	}

	/**
	* Verify that the passed time is within the validity period.
	* @param now the Date against which to compare the validity
	* period.
	*
	* @exception CertificateExpiredException if the certificate has expired
	* with respect to the <code>Date</code> supplied.
	* @exception CertificateNotYetValidException if the certificate is not
	* yet valid with respect to the <code>Date</code> supplied.
	*
	*/
	public void valid(Date now)
	throws CertificateNotYetValidException, CertificateExpiredException {
	/*
	* we use the internal Dates rather than the passed in Date
	* because someone could override the Date methods after()
	* and before() to do something entirely different.
	*/
	if (notBefore.after(now)) {
	throw new CertificateNotYetValidException("NotBefore: " +
	notBefore.toString());
	}
	if (notAfter.before(now)) {
	throw new CertificateExpiredException("NotAfter: " +
	notAfter.toString());
	}
	}
	}

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