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/*
* @(#)Authenticator.java 1.9 07/05/04
*/
package javax.mail;
import java.net.InetAddress;
/**
* 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 creating a subclass, and registering
* an instance of that subclass with the session when it is created.
* When authentication is required, the system will invoke a method
* on the subclass (like getPasswordAuthentication). The subclass's
* method can query about the authentication being requested with a
* number of inherited methods (getRequestingXXX()), and form an
* appropriate message for the user.
* <p>
* All methods that request authentication have a default implementation
* that fails.
*
* @see java.net.Authenticator
* @see javax.mail.Session#getInstance(java.util.Properties,
* javax.mail.Authenticator)
* @see javax.mail.Session#getDefaultInstance(java.util.Properties,
* javax.mail.Authenticator)
* @see javax.mail.Session#requestPasswordAuthentication
* @see javax.mail.PasswordAuthentication
*
* @author Bill Foote
* @author Bill Shannon
* @version 1.9, 05/04/07
*/
// There are no abstract methods, but to be useful the user must
// subclass.
public abstract class Authenticator {
private InetAddress requestingSite;
private int requestingPort;
private String requestingProtocol;
private String requestingPrompt;
private String requestingUserName;
private void reset() {
requestingSite = null;
requestingPort = -1;
requestingProtocol = null;
requestingPrompt = null;
requestingUserName = null;
}
/**
* Ask the authenticator for a password.
* <p>
*
* @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
* (@see java.net.Authenticator.getProtocol())
* @param prompt A prompt string for the user
*
* @return The username/password, or null if one can't be gotten.
*/
final PasswordAuthentication requestPasswordAuthentication(
InetAddress addr, int port, String protocol,
String prompt, String defaultUserName) {
reset();
requestingSite = addr;
requestingPort = port;
requestingProtocol = protocol;
requestingPrompt = prompt;
requestingUserName = defaultUserName;
return getPasswordAuthentication();
}
/**
* @return the InetAddress of the site requesting authorization, or null
* if it's not available.
*/
protected final InetAddress getRequestingSite() {
return requestingSite;
}
/**
* @return 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 URLName.
*
* @return the protcol
*
* @see javax.mail.URLName#getProtocol
*/
protected final String getRequestingProtocol() {
return requestingProtocol;
}
/**
* @return the prompt string given by the requestor
*/
protected final String getRequestingPrompt() {
return requestingPrompt;
}
/**
* @return the default user name given by the requestor
*/
protected final String getDefaultUserName() {
return requestingUserName;
}
/**
* Called when password authentication is needed. Subclasses should
* override the default implementation, which returns null. <p>
*
* Note that if this method uses a dialog to prompt the user for this
* information, the dialog needs to block until the user supplies the
* information. This method can not simply return after showing the
* dialog.
* @return The PasswordAuthentication collected from the
* user, or null if none is provided.
*/
protected PasswordAuthentication getPasswordAuthentication() {
return null;
}
}
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