/*
* @(#)Authenticator.java 1.32 04/06/28
*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
package java.net;
/**
* The class Authenticator represents an object that knows how to obtain
* authentication for a network connection. Usually, it will do this
* by prompting the user for information.
* <p>
* Applications use this class by overriding {@link
* #getPasswordAuthentication()} in a sub-class. This method will
* typically use the various getXXX() accessor methods to get information
* about the entity requesting authentication. It must then acquire a
* username and password either by interacting with the user or through
* some other non-interactive means. The credentials are then returned
* as a {@link PasswordAuthentication} return value.
* <p>
* An instance of this concrete sub-class is then registered
* with the system by calling {@link #setDefault(Authenticator)}.
* When authentication is required, the system will invoke one of the
* requestPasswordAuthentication() methods which in turn will call the
* getPasswordAuthentication() method of the registered object.
* <p>
* All methods that request authentication have a default implementation
* that fails.
*
* @see java.net.Authenticator#setDefault(java.net.Authenticator)
* @see java.net.Authenticator#getPasswordAuthentication()
*
* @author Bill Foote
* @version 1.32, 06/28/04
* @since 1.2
*/
// There are no abstract methods, but to be useful the user must
// subclass.
public abstract
class Authenticator {
// The system-wide authenticator object. See setDefault().
private static Authenticator theAuthenticator;
private String requestingHost;
private InetAddress requestingSite;
private int requestingPort;
private String requestingProtocol;
private String requestingPrompt;
private String requestingScheme;
private URL requestingURL;
private RequestorType requestingAuthType;
/**
* The type of the entity requesting authentication.
*
* @since 1.5
*/
public enum RequestorType {
/**
* Entity requesting authentication is a HTTP proxy server.
*/
PROXY,
/**
* Entity requesting authentication is a HTTP origin server.
*/
SERVER
}
private void reset() {
requestingHost = null;
requestingSite = null;
requestingPort = -1;
requestingProtocol = null;
requestingPrompt = null;
requestingScheme = null;
requestingURL = null;
requestingAuthType = RequestorType.SERVER;
}
/**
* Sets the authenticator that will be used by the networking code
* when a proxy or an HTTP server asks for authentication.
* <p>
* First, if there is a security manager, its <code>checkPermission</code>
* method is called with a
* <code>NetPermission("setDefaultAuthenticator")</code> permission.
* This may result in a java.lang.SecurityException.
*
* @param a The authenticator to be set. If a is <code>null</code> then
* any previously set authenticator is removed.
*
* @throws SecurityException
* if a security manager exists and its
* <code>checkPermission</code> method doesn't allow
* setting the default authenticator.
*
* @see SecurityManager#checkPermission
* @see java.net.NetPermission
*/
public synchronized static void setDefault(Authenticator a) {
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
NetPermission setDefaultPermission
= new NetPermission("setDefaultAuthenticator");
sm.checkPermission(setDefaultPermission);
}
theAuthenticator = a;
}
/**
* Ask the authenticator that has been registered with the system
* for a password.
* <p>
* First, if there is a security manager, its <code>checkPermission</code>
* method is called with a
* <code>NetPermission("requestPasswordAuthentication")</code> permission.
* This may result in a java.lang.SecurityException.
*
* @param addr The InetAddress of the site requesting authorization,
* or null if not known.
* @param port the port for the requested connection
* @param protocol The protocol that's requesting the connection
* ({@link java.net.Authenticator#getRequestingProtocol()})
* @param prompt A prompt string for the user
* @param scheme The authentication scheme
*
* @return The username/password, or null if one can't be gotten.
*
* @throws SecurityException
* if a security manager exists and its
* <code>checkPermission</code> method doesn't allow
* the password authentication request.
*
* @see SecurityManager#checkPermission
* @see java.net.NetPermission
*/
public static PasswordAuthentication requestPasswordAuthentication(
InetAddress addr,
int port,
String protocol,
String prompt,
String scheme) {
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
NetPermission requestPermission
= new NetPermission("requestPasswordAuthentication");
sm.checkPermission(requestPermission);
}
Authenticator a = theAuthenticator;
if (a == null) {
return null;
} else {
synchronized(a) {
a.reset();
a.requestingSite = addr;
a.requestingPort = port;
a.requestingProtocol = protocol;
a.requestingPrompt = prompt;
a.requestingScheme = scheme;
return a.getPasswordAuthentication();
}
}
}
/**
* Ask the authenticator that has been registered with the system
* for a password. This is the preferred method for requesting a password
* because the hostname can be provided in cases where the InetAddress
* is not available.
* <p>
* First, if there is a security manager, its <code>checkPermission</code>
* method is called with a
* <code>NetPermission("requestPasswordAuthentication")</code> permission.
* This may result in a java.lang.SecurityException.
*
* @param host The hostname of the site requesting authentication.
* @param addr The InetAddress of the site requesting authentication,
* or null if not known.
* @param port the port for the requested connection.
* @param protocol The protocol that's requesting the connection
* ({@link java.net.Authenticator#getRequestingProtocol()})
* @param prompt A prompt string for the user which identifies the authentication realm.
* @param scheme The authentication scheme
*
* @return The username/password, or null if one can't be gotten.
*
* @throws SecurityException
* if a security manager exists and its
* <code>checkPermission</code> method doesn't allow
* the password authentication request.
*
* @see SecurityManager#checkPermission
* @see java.net.NetPermission
* @since 1.4
*/
public static PasswordAuthentication requestPasswordAuthentication(
String host,
InetAddress addr,
int port,
String protocol,
String prompt,
String scheme) {
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
NetPermission requestPermission
= new NetPermission("requestPasswordAuthentication");
sm.checkPermission(requestPermission);
}
Authenticator a = theAuthenticator;
if (a == null) {
return null;
} else {
synchronized(a) {
a.reset();
a.requestingHost = host;
a.requestingSite = addr;
a.requestingPort = port;
a.requestingProtocol = protocol;
a.requestingPrompt = prompt;
a.requestingScheme = scheme;
return a.getPasswordAuthentication();
}
}
}
/**
* Ask the authenticator that has been registered with the system
* for a password.
* <p>
* First, if there is a security manager, its <code>checkPermission</code>
* method is called with a
* <code>NetPermission("requestPasswordAuthentication")</code> permission.
* This may result in a java.lang.SecurityException.
*
* @param host The hostname of the site requesting authentication.
* @param addr The InetAddress of the site requesting authorization,
* or null if not known.
* @param port the port for the requested connection
* @param protocol The protocol that's requesting the connection
* ({@link java.net.Authenticator#getRequestingProtocol()})
* @param prompt A prompt string for the user
* @param scheme The authentication scheme
* @param url The requesting URL that caused the authentication
* @param reqType The type (server or proxy) of the entity requesting
* authentication.
*
* @return The username/password, or null if one can't be gotten.
*
* @throws SecurityException
* if a security manager exists and its
* <code>checkPermission</code> method doesn't allow
* the password authentication request.
*
* @see SecurityManager#checkPermission
* @see java.net.NetPermission
*
* @since 1.5
*/
public static PasswordAuthentication requestPasswordAuthentication(
String host,
InetAddress addr,
int port,
String protocol,
String prompt,
String scheme,
URL url,
RequestorType reqType) {
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
NetPermission requestPermission
= new NetPermission("requestPasswordAuthentication");
sm.checkPermission(requestPermission);
}
Authenticator a = theAuthenticator;
if (a == null) {
return null;
} else {
synchronized(a) {
a.reset();
a.requestingHost = host;
a.requestingSite = addr;
a.requestingPort = port;
a.requestingProtocol = protocol;
a.requestingPrompt = prompt;
a.requestingScheme = scheme;
a.requestingURL = url;
a.requestingAuthType = reqType;
return a.getPasswordAuthentication();
}
}
}
/**
* Gets the <code>hostname</code> of the
* site or proxy requesting authentication, or <code>null</code>
* if not available.
*
* @return the hostname of the connection requiring authentication, or null
* if it's not available.
* @since 1.4
*/
protected final String getRequestingHost() {
return requestingHost;
}
/**
* Gets the <code>InetAddress</code> of the
* site requesting authorization, or <code>null</code>
* if not available.
*
* @return the InetAddress of the site requesting authorization, or null
* if it's not available.
*/
protected final InetAddress getRequestingSite() {
return requestingSite;
}
/**
* Gets the port number for the requested connection.
* @return an <code>int</code> indicating the
* port for the requested connection.
*/
protected final int getRequestingPort() {
return requestingPort;
}
/**
* Give the protocol that's requesting the connection. Often this
* will be based on a URL, but in a future JDK it could be, for
* example, "SOCKS" for a password-protected SOCKS5 firewall.
*
* @return the protcol, optionally followed by "/version", where
* version is a version number.
*
* @see java.net.URL#getProtocol()
*/
protected final String getRequestingProtocol() {
return requestingProtocol;
}
/**
* Gets the prompt string given by the requestor.
*
* @return the prompt string given by the requestor (realm for
* http requests)
*/
protected final String getRequestingPrompt() {
return requestingPrompt;
}
/**
* Gets the scheme of the requestor (the HTTP scheme
* for an HTTP firewall, for example).
*
* @return the scheme of the requestor
*
*/
protected final String getRequestingScheme() {
return requestingScheme;
}
/**
* Called when password authorization is needed. Subclasses should
* override the default implementation, which returns null.
* @return The PasswordAuthentication collected from the
* user, or null if none is provided.
*/
protected PasswordAuthentication getPasswordAuthentication() {
return null;
}
/**
* Returns the URL that resulted in this
* request for authentication.
*
* @since 1.5
*
* @return the requesting URL
*
*/
protected URL getRequestingURL () {
return requestingURL;
}
/**
* Returns whether the requestor is a Proxy or a Server.
*
* @since 1.5
*
* @return the authentication type of the requestor
*
*/
protected RequestorType getRequestorType () {
return requestingAuthType;
}
}
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