mirror of git://gcc.gnu.org/git/gcc.git
270 lines
7.5 KiB
Java
270 lines
7.5 KiB
Java
/* Authenticator.java -- Abstract class for obtaining authentication info
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Copyright (C) 1998,2000 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA.
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As a special exception, if you link this library with other files to
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produce an executable, this library does not by itself cause the
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resulting executable to be covered by the GNU General Public License.
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This exception does not however invalidate any other reasons why the
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executable file might be covered by the GNU General Public License. */
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package java.net;
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/**
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* Sometimes a network operation (such as hitting a password protected
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* web site) will require authentication information in the form of a
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* username and password. This abstract class provides a model for
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* obtaining that information.
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* <p>
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* To make use of this feature, a programmer must create a subclass of
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* Authenticator that knows how to obtain the necessary info. An example
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* would be a class that popped up a dialog box to prompt the user.
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* After creating an instance of that subclass, the static setDefault
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* method of this class is called to set up that instance as the object
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* to use on subsequent calls to obtain authorization.
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*
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* @since 1.2
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*
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* @author Aaron M. Renn (arenn@urbanophile.com)
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*/
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public abstract class Authenticator
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{
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/*************************************************************************/
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/*
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* Class Variables
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*/
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/**
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* This is the default Authenticator object to use for password requests
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*/
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private static Authenticator default_authenticator;
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/*************************************************************************/
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/*
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* Instance Variables
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*/
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/**
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* InternetAddress of the site requesting authentication
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*/
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private InetAddress addr;
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/**
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* The port number of the site requesting authentication
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*/
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private int port;
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/**
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* The protocol name of the site requesting authentication
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*/
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private String protocol;
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/**
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* The prompt to display to the user when requesting authentication info
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*/
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private String prompt;
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/**
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* The authentication scheme in use
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*/
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private String scheme;
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/*************************************************************************/
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/*
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* Class Methods
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*/
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/**
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* This method sets the default <code>Authenticator</code> object (an
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* instance of a
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* subclass of <code>Authenticator</code>) to use when prompting the user for
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* information. Note that this method checks to see if the caller is
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* allowed to set this value (the "setDefaultAuthenticator" permission)
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* and throws a <code>SecurityException</code> if it is not.
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*
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* @param def_auth The new default <code>Authenticator</code> object to use
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*
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* @exception SecurityException If the caller does not have permission
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* to perform this operation
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*/
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public static void
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setDefault(Authenticator def_auth)
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{
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SecurityManager sm = System.getSecurityManager();
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if (sm != null)
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sm.checkPermission(new NetPermission("setDefaultAuthenticator"));
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default_authenticator = def_auth;
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}
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/*************************************************************************/
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/**
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* This method is called whenever a username and password for a given
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* network operation is required. First, a security check is made to see
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* if the caller has the "requestPasswordAuthentication"
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* permission. If not, the method thows an exception. If there is no
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* default <code>Authenticator</code> object, the method then returns
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* <code>null</code>. Otherwise, the default authenticators's instance
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* variables are initialized and it's <code>getPasswordAuthentication</code>
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* method is called to get the actual authentication information to return.
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*
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* @param addr The address requesting authentication
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* @param port The port requesting authentication
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* @param protocol The protocol requesting authentication
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* @param prompt The prompt to display to the user when requesting
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authentication info
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* @param scheme The authentication scheme in use
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*
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* @return A <code>PasswordAuthentication</code> object with the user's
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* authentication info.
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*
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* @exception SecurityException If the caller does not have permission to
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* perform this operation
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*/
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public static PasswordAuthentication
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requestPasswordAuthentication(InetAddress addr, int port, String protocol,
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String prompt, String scheme)
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{
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SecurityManager sm = System.getSecurityManager();
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if (sm != null)
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sm.checkPermission(new NetPermission("requestPasswordAuthentication"));
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if (default_authenticator == null)
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return(null);
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default_authenticator.addr = addr;
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default_authenticator.port = port;
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default_authenticator.protocol = protocol;
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default_authenticator.prompt = prompt;
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default_authenticator.scheme = scheme;
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return(default_authenticator.getPasswordAuthentication());
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}
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/*************************************************************************/
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/*
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* Constructors
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*/
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/**
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* Default, no-argument constructor for subclasses to call.
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*/
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public
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Authenticator()
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{
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}
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/*************************************************************************/
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/*
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* Instance Methods
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*/
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/**
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* This method returns the address of the site that is requesting
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* authentication.
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*
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* @return The requesting site
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*/
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protected final InetAddress
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getRequestingSite()
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{
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return(addr);
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}
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/*************************************************************************/
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/**
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* This method returns the port of the site that is requesting
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* authentication.
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*
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* @return The requesting port
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*/
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protected final int
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getRequestingPort()
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{
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return(port);
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}
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/*************************************************************************/
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/**
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* This method returns the requesting protocol of the operation that is
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* requesting authentication
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*
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* @return The requesting protocol
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*/
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protected final String
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getRequestingProtocol()
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{
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return(protocol);
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}
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/*************************************************************************/
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/**
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* Returns the prompt that should be used when requesting authentication
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* information from the user
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*
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* @return The user prompt
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*/
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protected final String
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getRequestingPrompt()
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{
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return(prompt);
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}
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/*************************************************************************/
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/**
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* This method returns the authentication scheme in use
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*
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* @return The authentication scheme
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*/
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protected final String
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getRequestingScheme()
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{
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return(scheme);
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}
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/*************************************************************************/
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/**
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* This method is called whenever a request for authentication is made. It
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* can call the other getXXX methods to determine the information relevant
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* to this request. Subclasses should override this method, which returns
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* <code>null</code> by default.
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*
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* @return The PasswordAuthentication information
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*/
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protected PasswordAuthentication
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getPasswordAuthentication()
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{
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return(null);
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}
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} // class Authenticator
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