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	/*
	* Copyright (c) 1997, 2011, 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.util.Locale;

	import sun.security.util.*;

	/**
	* This class implements the RFC822Name as required by the GeneralNames
	* ASN.1 object.
	*
	* @author Amit Kapoor
	* @author Hemma Prafullchandra
	* @see GeneralName
	* @see GeneralNames
	* @see GeneralNameInterface
	*/
	public class RFC822Name implements GeneralNameInterface
	{
	private String name;

	/**
	* Create the RFC822Name object from the passed encoded Der value.
	*
	* @param derValue the encoded DER RFC822Name.
	* @exception IOException on error.
	*/
	public RFC822Name(DerValue derValue) throws IOException {
	name = derValue.getIA5String();
	parseName(name);
	}

	/**
	* Create the RFC822Name object with the specified name.
	*
	* @param name the RFC822Name.
	* @throws IOException on invalid input name
	*/
	public RFC822Name(String name) throws IOException {
	parseName(name);
	this.name = name;
	}

	/**
	* Parse an RFC822Name string to see if it is a valid
	* addr-spec according to IETF RFC822 and RFC2459:
	* [local-part@]domain
	* <p>
	* local-part@ could be empty for an RFC822Name NameConstraint,
	* but the domain at least must be non-empty. Case is not
	* significant.
	*
	* @param name the RFC822Name string
	* @throws IOException if name is not valid
	*/
	public void parseName(String name) throws IOException {
	if (name == null \|\| name.length() == 0) {
	throw new IOException("RFC822Name may not be null or empty");
	}
	// See if domain is a valid domain name
	String domain = name.substring(name.indexOf('@')+1);
	if (domain.length() == 0) {
	throw new IOException("RFC822Name may not end with @");
	} else {
	//An RFC822 NameConstraint could start with a ., although
	//a DNSName may not
	if (domain.startsWith(".")) {
	if (domain.length() == 1)
	throw new IOException("RFC822Name domain may not be just .");
	}
	}
	}

	/**
	* Return the type of the GeneralName.
	*/
	public int getType() {
	return (GeneralNameInterface.NAME_RFC822);
	}

	/**
	* Return the actual name value of the GeneralName.
	*/
	public String getName() {
	return name;
	}

	/**
	* Encode the RFC822 name into the DerOutputStream.
	*
	* @param out the DER stream to encode the RFC822Name to.
	* @exception IOException on encoding errors.
	*/
	public void encode(DerOutputStream out) throws IOException {
	out.putIA5String(name);
	}

	/**
	* Convert the name into user readable string.
	*/
	public String toString() {
	return ("RFC822Name: " + name);
	}

	/**
	* Compares this name with another, for equality.
	*
	* @return true iff the names are equivalent
	* according to RFC2459.
	*/
	public boolean equals(Object obj) {
	if (this == obj)
	return true;

	if (!(obj instanceof RFC822Name))
	return false;

	RFC822Name other = (RFC822Name)obj;

	// RFC2459 mandates that these names are
	// not case-sensitive
	return name.equalsIgnoreCase(other.name);
	}

	/**
	* Returns the hash code value for this object.
	*
	* @return a hash code value for this object.
	*/
	public int hashCode() {
	return name.toUpperCase(Locale.ENGLISH).hashCode();
	}

	/**
	* Return constraint type:<ul>
	* <li>NAME_DIFF_TYPE = -1: input name is different type from name (i.e. does not constrain)
	* <li>NAME_MATCH = 0: input name matches name
	* <li>NAME_NARROWS = 1: input name narrows name
	* <li>NAME_WIDENS = 2: input name widens name
	* <li>NAME_SAME_TYPE = 3: input name does not match or narrow name, but is same type
	* </ul>. These results are used in checking NameConstraints during
	* certification path verification.
	* <p>
	* [RFC2459] When the subjectAltName extension contains an Internet mail address,
	* the address MUST be included as an rfc822Name. The format of an
	* rfc822Name is an "addr-spec" as defined in RFC 822 [RFC 822]. An
	* addr-spec has the form "local-part@domain". Note that an addr-spec
	* has no phrase (such as a common name) before it, has no comment (text
	* surrounded in parentheses) after it, and is not surrounded by "<" and
	* ">". Note that while upper and lower case letters are allowed in an
	* RFC 822 addr-spec, no significance is attached to the case.
	*
	* @param inputName to be checked for being constrained
	* @return constraint type above
	* @throws UnsupportedOperationException if name is not exact match, but narrowing and widening are
	* not supported for this name type.
	*/
	public int constrains(GeneralNameInterface inputName) throws UnsupportedOperationException {
	int constraintType;
	if (inputName == null)
	constraintType = NAME_DIFF_TYPE;
	else if (inputName.getType() != (GeneralNameInterface.NAME_RFC822)) {
	constraintType = NAME_DIFF_TYPE;
	} else {
	//RFC2459 specifies that case is not significant in RFC822Names
	String inName =
	(((RFC822Name)inputName).getName()).toLowerCase(Locale.ENGLISH);
	String thisName = name.toLowerCase(Locale.ENGLISH);
	if (inName.equals(thisName)) {
	constraintType = NAME_MATCH;
	} else if (thisName.endsWith(inName)) {
	/* if both names contain @, then they had to match exactly */
	if (inName.indexOf('@') != -1) {
	constraintType = NAME_SAME_TYPE;
	} else if (inName.startsWith(".")) {
	constraintType = NAME_WIDENS;
	} else {
	int inNdx = thisName.lastIndexOf(inName);
	if (thisName.charAt(inNdx-1) == '@' ) {
	constraintType = NAME_WIDENS;
	} else {
	constraintType = NAME_SAME_TYPE;
	}
	}
	} else if (inName.endsWith(thisName)) {
	/* if thisName contains @, then they had to match exactly */
	if (thisName.indexOf('@') != -1) {
	constraintType = NAME_SAME_TYPE;
	} else if (thisName.startsWith(".")) {
	constraintType = NAME_NARROWS;
	} else {
	int ndx = inName.lastIndexOf(thisName);
	if (inName.charAt(ndx-1) == '@') {
	constraintType = NAME_NARROWS;
	} else {
	constraintType = NAME_SAME_TYPE;
	}
	}
	} else {
	constraintType = NAME_SAME_TYPE;
	}
	}
	return constraintType;
	}

	/**
	* Return subtree depth of this name for purposes of determining
	* NameConstraints minimum and maximum bounds.
	*
	* @return distance of name from root
	* @throws UnsupportedOperationException if not supported for this name type
	*/
	public int subtreeDepth() throws UnsupportedOperationException {
	String subtree=name;
	int i=1;

	/* strip off name@ portion */
	int atNdx = subtree.lastIndexOf('@');
	if (atNdx >= 0) {
	i++;
	subtree=subtree.substring(atNdx+1);
	}

	/* count dots in dnsname, adding one if dnsname preceded by @ */
	for (; subtree.lastIndexOf('.') >= 0; i++) {
	subtree=subtree.substring(0,subtree.lastIndexOf('.'));
	}

	return i;
	}
	}

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