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	/*
	* Copyright (c) 2005, 2016, 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.net.www.protocol.http;

	import java.net.URL;
	import java.io.IOException;
	import java.net.Authenticator.RequestorType;
	import java.util.Base64;
	import java.util.HashMap;
	import sun.net.www.HeaderParser;
	import sun.util.logging.PlatformLogger;
	import static sun.net.www.protocol.http.AuthScheme.NEGOTIATE;
	import static sun.net.www.protocol.http.AuthScheme.KERBEROS;
	import sun.security.action.GetPropertyAction;

	/**
	* NegotiateAuthentication:
	*
	* @author weijun.wang@sun.com
	* @since 1.6
	*/

	class NegotiateAuthentication extends AuthenticationInfo {

	private static final long serialVersionUID = 100L;
	private static final PlatformLogger logger = HttpURLConnection.getHttpLogger();

	private final HttpCallerInfo hci;

	// These maps are used to manage the GSS availability for diffrent
	// hosts. The key for both maps is the host name.
	// <code>supported</code> is set when isSupported is checked,
	// if it's true, a cached Negotiator is put into <code>cache</code>.
	// the cache can be used only once, so after the first use, it's cleaned.
	static HashMap <String, Boolean> supported = null;
	static ThreadLocal <HashMap <String, Negotiator>> cache = null;
	/* Whether cache is enabled for Negotiate/Kerberos */
	private static final boolean cacheSPNEGO;
	static {
	String spnegoCacheProp =
	GetPropertyAction.privilegedGetProperty("jdk.spnego.cache", "true");
	cacheSPNEGO = Boolean.parseBoolean(spnegoCacheProp);
	}

	// The HTTP Negotiate Helper
	private Negotiator negotiator = null;

	/**
	* Constructor used for both WWW and proxy entries.
	* @param hci a schemed object.
	*/
	public NegotiateAuthentication(HttpCallerInfo hci) {
	super(RequestorType.PROXY==hci.authType ? PROXY_AUTHENTICATION : SERVER_AUTHENTICATION,
	hci.scheme.equalsIgnoreCase("Negotiate") ? NEGOTIATE : KERBEROS,
	hci.url,
	"",
	AuthenticatorKeys.getKey(hci.authenticator));
	this.hci = hci;
	}

	/**
	* @return true if this authentication supports preemptive authorization
	*/
	@Override
	public boolean supportsPreemptiveAuthorization() {
	return false;
	}

	/**
	* Find out if the HttpCallerInfo supports Negotiate protocol.
	* @return true if supported
	*/
	public static boolean isSupported(HttpCallerInfo hci) {
	ClassLoader loader = null;
	try {
	loader = Thread.currentThread().getContextClassLoader();
	} catch (SecurityException se) {
	if (logger.isLoggable(PlatformLogger.Level.FINER)) {
	logger.finer("NegotiateAuthentication: " +
	"Attempt to get the context class loader failed - " + se);
	}
	}

	if (loader != null) {
	// Lock on the class loader instance to avoid the deadlock engaging
	// the lock in "ClassLoader.loadClass(String, boolean)" method.
	synchronized (loader) {
	return isSupportedImpl(hci);
	}
	}
	return isSupportedImpl(hci);
	}

	/**
	* Find out if the HttpCallerInfo supports Negotiate protocol. In order to
	* find out yes or no, an initialization of a Negotiator object against it
	* is tried. The generated object will be cached under the name of ths
	* hostname at a success try.<br>
	*
	* If this method is called for the second time on an HttpCallerInfo with
	* the same hostname, the answer is retrieved from cache.
	*
	* @return true if supported
	*/
	private static synchronized boolean isSupportedImpl(HttpCallerInfo hci) {
	if (supported == null) {
	supported = new HashMap<>();
	}
	String hostname = hci.host;
	hostname = hostname.toLowerCase();
	if (supported.containsKey(hostname)) {
	return supported.get(hostname);
	}

	Negotiator neg = Negotiator.getNegotiator(hci);
	if (neg != null) {
	supported.put(hostname, true);
	// the only place cache.put is called. here we can make sure
	// the object is valid and the oneToken inside is not null
	if (cache == null) {
	cache = new ThreadLocal<>() {
	@Override
	protected HashMap<String, Negotiator> initialValue() {
	return new HashMap<>();
	}
	};
	}
	cache.get().put(hostname, neg);
	return true;
	} else {
	supported.put(hostname, false);
	return false;
	}
	}

	private static synchronized HashMap<String, Negotiator> getCache() {
	if (cache == null) return null;
	return cache.get();
	}

	@Override
	protected boolean useAuthCache() {
	return super.useAuthCache() && cacheSPNEGO;
	}

	/**
	* Not supported. Must use the setHeaders() method
	*/
	@Override
	public String getHeaderValue(URL url, String method) {
	throw new RuntimeException ("getHeaderValue not supported");
	}

	/**
	* Check if the header indicates that the current auth. parameters are stale.
	* If so, then replace the relevant field with the new value
	* and return true. Otherwise return false.
	* returning true means the request can be retried with the same userid/password
	* returning false means we have to go back to the user to ask for a new
	* username password.
	*/
	@Override
	public boolean isAuthorizationStale (String header) {
	return false; /* should not be called for Negotiate */
	}

	/**
	* Set header(s) on the given connection.
	* @param conn The connection to apply the header(s) to
	* @param p A source of header values for this connection, not used because
	* HeaderParser converts the fields to lower case, use raw instead
	* @param raw The raw header field.
	* @return true if all goes well, false if no headers were set.
	*/
	@Override
	public synchronized boolean setHeaders(HttpURLConnection conn, HeaderParser p, String raw) {

	try {
	String response;
	byte[] incoming = null;
	String[] parts = raw.split("\\s+");
	if (parts.length > 1) {
	incoming = Base64.getDecoder().decode(parts[1]);
	}
	response = hci.scheme + " " + Base64.getEncoder().encodeToString(
	incoming==null?firstToken():nextToken(incoming));

	conn.setAuthenticationProperty(getHeaderName(), response);
	return true;
	} catch (IOException e) {
	return false;
	}
	}

	/**
	* return the first token.
	* @return the token
	* @throws IOException if <code>Negotiator.getNegotiator()</code> or
	* <code>Negotiator.firstToken()</code> failed.
	*/
	private byte[] firstToken() throws IOException {
	negotiator = null;
	HashMap <String, Negotiator> cachedMap = getCache();
	if (cachedMap != null) {
	negotiator = cachedMap.get(getHost());
	if (negotiator != null) {
	cachedMap.remove(getHost()); // so that it is only used once
	}
	}
	if (negotiator == null) {
	negotiator = Negotiator.getNegotiator(hci);
	if (negotiator == null) {
	IOException ioe = new IOException("Cannot initialize Negotiator");
	throw ioe;
	}
	}

	return negotiator.firstToken();
	}

	/**
	* return more tokens
	* @param token the token to be fed into <code>negotiator.nextToken()</code>
	* @return the token
	* @throws IOException if <code>negotiator.nextToken()</code> throws Exception.
	* May happen if the input token is invalid.
	*/
	private byte[] nextToken(byte[] token) throws IOException {
	return negotiator.nextToken(token);
	}

	// MS will send a final WWW-Authenticate even if the status is already
	// 200 OK. The token can be fed into initSecContext() again to determine
	// if the server can be trusted. This is not the same concept as Digest's
	// Authentication-Info header.
	//
	// Currently we ignore this header.

	}

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