/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package java.net;
/**
* An implementation of this class is able to obtain authentication information
* for a connection in several ways. For this purpose it has to set the default
* authenticator which extends {@code Authenticator} by {@code
* setDefault(Authenticator a)}. Then it should override {@code
* getPasswordAuthentication()} which dictates how the authentication info is
* obtained. Usually, it prompts the user for the required input.
*
* @see #setDefault
* @see #getPasswordAuthentication
*/
public abstract class Authenticator {
// the default authenticator that needs to be set
private static Authenticator thisAuthenticator;
private static final NetPermission requestPasswordAuthenticationPermission = new NetPermission(
"requestPasswordAuthentication");
private static final NetPermission setDefaultAuthenticatorPermission = new NetPermission(
"setDefaultAuthenticator");
// the requester connection info
private String host;
private InetAddress addr;
private int port;
private String protocol;
private String prompt;
private String scheme;
private URL url;
private RequestorType rt;
/**
* Returns the collected username and password for authorization. The
* subclass has to override this method to return a value different to the
* default which is {@code null}.
* <p>
* Returns {@code null} by default.
*
* @return collected password authentication data.
*/
protected PasswordAuthentication getPasswordAuthentication() {
return null;
}
/**
* Returns the port of the connection that requests authorization.
*
* @return port of the connection.
*/
protected final int getRequestingPort() {
return this.port;
}
/**
* Returns the address of the connection that requests authorization or
* {@code null} if unknown.
*
* @return address of the connection.
*/
protected final InetAddress getRequestingSite() {
return this.addr;
}
/**
* Returns the realm (prompt string) of the connection that requests
* authorization.
*
* @return prompt string of the connection.
*/
protected final String getRequestingPrompt() {
return this.prompt;
}
/**
* Returns the protocol of the connection that requests authorization.
*
* @return protocol of the connection.
*/
protected final String getRequestingProtocol() {
return this.protocol;
}
/**
* Returns the scheme of the connection that requests authorization, for
* example HTTP Basic Authentication.
*
* @return scheme of the connection.
*/
protected final String getRequestingScheme() {
return this.scheme;
}
/**
* Invokes the methods of the registered
* authenticator to get the authentication info.
*
* @return password authentication info or {@code null} if no authenticator
* exists.
* @param rAddr
* address of the connection that requests authentication.
* @param rPort
* port of the connection that requests authentication.
* @param rProtocol
* protocol of the connection that requests authentication.
* @param rPrompt
* realm of the connection that requests authentication.
* @param rScheme
* scheme of the connection that requests authentication.
*/
public static synchronized PasswordAuthentication requestPasswordAuthentication(
InetAddress rAddr, int rPort, String rProtocol, String rPrompt,
String rScheme) {
if (thisAuthenticator == null) {
return null;
}
// set the requester info so it knows what it is requesting
// authentication for
thisAuthenticator.addr = rAddr;
thisAuthenticator.port = rPort;
thisAuthenticator.protocol = rProtocol;
thisAuthenticator.prompt = rPrompt;
thisAuthenticator.scheme = rScheme;
thisAuthenticator.rt = RequestorType.SERVER;
// returns the authentication info obtained by the registered
// Authenticator
return thisAuthenticator.getPasswordAuthentication();
}
/**
* Sets {@code a} as the default authenticator. It will be called whenever
* the realm that the URL is pointing to requires authorization.
*
* @param a
* authenticator which has to be set as default.
*/
public static void setDefault(Authenticator a) {
thisAuthenticator = a;
}
/**
* Invokes the methods of the registered
* authenticator to get the authentication info.
*
* @return password authentication info or {@code null} if no authenticator
* exists.
* @param rHost
* host name of the connection that requests authentication.
* @param rAddr
* address of the connection that requests authentication.
* @param rPort
* port of the connection that requests authentication.
* @param rProtocol
* protocol of the connection that requests authentication.
* @param rPrompt
* realm of the connection that requests authentication.
* @param rScheme
* scheme of the connection that requests authentication.
*/
public static synchronized PasswordAuthentication requestPasswordAuthentication(
String rHost, InetAddress rAddr, int rPort, String rProtocol,
String rPrompt, String rScheme) {
if (thisAuthenticator == null) {
return null;
}
// set the requester info so it knows what it is requesting
// authentication for
thisAuthenticator.host = rHost;
thisAuthenticator.addr = rAddr;
thisAuthenticator.port = rPort;
thisAuthenticator.protocol = rProtocol;
thisAuthenticator.prompt = rPrompt;
thisAuthenticator.scheme = rScheme;
thisAuthenticator.rt = RequestorType.SERVER;
// returns the authentication info obtained by the registered
// Authenticator
return thisAuthenticator.getPasswordAuthentication();
}
/**
* Returns the host name of the connection that requests authentication or
* {@code null} if unknown.
*
* @return name of the requesting host or {@code null}.
*/
protected final String getRequestingHost() {
return host;
}
/**
* Invokes the methods of the registered
* authenticator to get the authentication info.
*
* @return password authentication info or {@code null} if no authenticator
* exists.
* @param rHost
* host name of the connection that requests authentication.
* @param rAddr
* address of the connection that requests authentication.
* @param rPort
* port of the connection that requests authentication.
* @param rProtocol
* protocol of the connection that requests authentication.
* @param rPrompt
* realm of the connection that requests authentication.
* @param rScheme
* scheme of the connection that requests authentication.
* @param rURL
* url of the connection that requests authentication.
* @param reqType
* requestor type of the connection that requests authentication.
*/
public static PasswordAuthentication requestPasswordAuthentication(
String rHost, InetAddress rAddr, int rPort, String rProtocol,
String rPrompt, String rScheme, URL rURL,
Authenticator.RequestorType reqType) {
if (thisAuthenticator == null) {
return null;
}
// sets the requester info so it knows what it is requesting
// authentication for
thisAuthenticator.host = rHost;
thisAuthenticator.addr = rAddr;
thisAuthenticator.port = rPort;
thisAuthenticator.protocol = rProtocol;
thisAuthenticator.prompt = rPrompt;
thisAuthenticator.scheme = rScheme;
thisAuthenticator.url = rURL;
thisAuthenticator.rt = reqType;
// returns the authentication info obtained by the registered
// Authenticator
return thisAuthenticator.getPasswordAuthentication();
}
/**
* Returns the URL of the authentication request.
*
* @return authentication request url.
*/
protected URL getRequestingURL() {
return url;
}
/**
* Returns the type of this request, it can be {@code PROXY} or {@code SERVER}.
*
* @return RequestorType of the authentication request.
*/
protected Authenticator.RequestorType getRequestorType() {
return rt;
}
/**
* Enumeration class for the origin of the authentication request.
*/
public enum RequestorType {
/**
* Type of proxy server
*/
PROXY,
/**
* Type of origin server
*/
SERVER
}
}