Authenticator
public
abstract
class
Authenticator
extends Object
java.lang.Object | |
↳ | java.net.Authenticator |
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.
Applications use this class by overriding 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 PasswordAuthentication
return value.
An instance of this concrete sub-class is then registered
with the system by calling setDefault(java.net.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.
All methods that request authentication have a default implementation that fails.
Summary
Public constructors | |
---|---|
Authenticator()
|
Public methods | |
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static
PasswordAuthentication
|
requestPasswordAuthentication(String host, InetAddress addr, int port, String protocol, String prompt, String scheme, URL url, Authenticator.RequestorType reqType)
Ask the authenticator that has been registered with the system for a password. |
static
PasswordAuthentication
|
requestPasswordAuthentication(InetAddress addr, int port, String protocol, String prompt, String scheme)
Ask the authenticator that has been registered with the system for a password. |
static
PasswordAuthentication
|
requestPasswordAuthentication(String host, InetAddress addr, int port, String protocol, String prompt, String scheme)
Ask the authenticator that has been registered with the system for a password. |
static
void
|
setDefault(Authenticator a)
Sets the authenticator that will be used by the networking code when a proxy or an HTTP server asks for authentication. |
Protected methods | |
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PasswordAuthentication
|
getPasswordAuthentication()
Called when password authorization is needed. |
final
String
|
getRequestingHost()
Gets the |
final
int
|
getRequestingPort()
Gets the port number for the requested connection. |
final
String
|
getRequestingPrompt()
Gets the prompt string given by the requestor. |
final
String
|
getRequestingProtocol()
Give the protocol that's requesting the connection. |
final
String
|
getRequestingScheme()
Gets the scheme of the requestor (the HTTP scheme for an HTTP firewall, for example). |
final
InetAddress
|
getRequestingSite()
Gets the |
URL
|
getRequestingURL()
Returns the URL that resulted in this request for authentication. |
Authenticator.RequestorType
|
getRequestorType()
Returns whether the requestor is a Proxy or a Server. |
Inherited methods | |
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Public constructors
Public methods
requestPasswordAuthentication
public static PasswordAuthentication requestPasswordAuthentication (String host, InetAddress addr, int port, String protocol, String prompt, String scheme, URL url, Authenticator.RequestorType reqType)
Ask the authenticator that has been registered with the system for a password.
First, if there is a security manager, its checkPermission
method is called with a
NetPermission("requestPasswordAuthentication")
permission.
This may result in a java.lang.SecurityException.
Parameters | |
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host |
String : The hostname of the site requesting authentication. |
addr |
InetAddress : The InetAddress of the site requesting authorization,
or null if not known. |
port |
int : the port for the requested connection |
protocol |
String : The protocol that's requesting the connection
(getRequestingProtocol() ) |
prompt |
String : A prompt string for the user |
scheme |
String : The authentication scheme |
url |
URL : The requesting URL that caused the authentication |
reqType |
Authenticator.RequestorType : The type (server or proxy) of the entity requesting
authentication. |
Returns | |
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PasswordAuthentication |
The username/password, or null if one can't be gotten. |
Throws | |
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SecurityException |
if a security manager exists and its
checkPermission method doesn't allow
the password authentication request. |
requestPasswordAuthentication
public static PasswordAuthentication requestPasswordAuthentication (InetAddress addr, int port, String protocol, String prompt, String scheme)
Ask the authenticator that has been registered with the system for a password.
First, if there is a security manager, its checkPermission
method is called with a
NetPermission("requestPasswordAuthentication")
permission.
This may result in a java.lang.SecurityException.
Parameters | |
---|---|
addr |
InetAddress : The InetAddress of the site requesting authorization,
or null if not known. |
port |
int : the port for the requested connection |
protocol |
String : The protocol that's requesting the connection
(getRequestingProtocol() ) |
prompt |
String : A prompt string for the user |
scheme |
String : The authentication scheme |
Returns | |
---|---|
PasswordAuthentication |
The username/password, or null if one can't be gotten. |
Throws | |
---|---|
SecurityException |
if a security manager exists and its
checkPermission method doesn't allow
the password authentication request. |
requestPasswordAuthentication
public static PasswordAuthentication requestPasswordAuthentication (String host, InetAddress addr, int port, String protocol, String prompt, String scheme)
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.
First, if there is a security manager, its checkPermission
method is called with a
NetPermission("requestPasswordAuthentication")
permission.
This may result in a java.lang.SecurityException.
Parameters | |
---|---|
host |
String : The hostname of the site requesting authentication. |
addr |
InetAddress : The InetAddress of the site requesting authentication,
or null if not known. |
port |
int : the port for the requested connection. |
protocol |
String : The protocol that's requesting the connection
(getRequestingProtocol() ) |
prompt |
String : A prompt string for the user which identifies the authentication realm. |
scheme |
String : The authentication scheme |
Returns | |
---|---|
PasswordAuthentication |
The username/password, or null if one can't be gotten. |
Throws | |
---|---|
SecurityException |
if a security manager exists and its
checkPermission method doesn't allow
the password authentication request. |
setDefault
public static void setDefault (Authenticator a)
Sets the authenticator that will be used by the networking code when a proxy or an HTTP server asks for authentication.
First, if there is a security manager, its checkPermission
method is called with a
NetPermission("setDefaultAuthenticator")
permission.
This may result in a java.lang.SecurityException.
Parameters | |
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a |
Authenticator : The authenticator to be set. If a is null then
any previously set authenticator is removed. |
Throws | |
---|---|
SecurityException |
if a security manager exists and its
checkPermission method doesn't allow
setting the default authenticator. |
Protected methods
getPasswordAuthentication
protected PasswordAuthentication getPasswordAuthentication ()
Called when password authorization is needed. Subclasses should override the default implementation, which returns null.
Returns | |
---|---|
PasswordAuthentication |
The PasswordAuthentication collected from the user, or null if none is provided. |
getRequestingHost
protected final String getRequestingHost ()
Gets the hostname
of the
site or proxy requesting authentication, or null
if not available.
Returns | |
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String |
the hostname of the connection requiring authentication, or null if it's not available. |
getRequestingPort
protected final int getRequestingPort ()
Gets the port number for the requested connection.
Returns | |
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int |
an int indicating the
port for the requested connection. |
getRequestingPrompt
protected final String getRequestingPrompt ()
Gets the prompt string given by the requestor.
Returns | |
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String |
the prompt string given by the requestor (realm for http requests) |
getRequestingProtocol
protected final String getRequestingProtocol ()
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.
Returns | |
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String |
the protocol, optionally followed by "/version", where version is a version number. |
See also:
getRequestingScheme
protected final String getRequestingScheme ()
Gets the scheme of the requestor (the HTTP scheme for an HTTP firewall, for example).
Returns | |
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String |
the scheme of the requestor |
getRequestingSite
protected final InetAddress getRequestingSite ()
Gets the InetAddress
of the
site requesting authorization, or null
if not available.
Returns | |
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InetAddress |
the InetAddress of the site requesting authorization, or null if it's not available. |
getRequestingURL
protected URL getRequestingURL ()
Returns the URL that resulted in this request for authentication.
Returns | |
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URL |
the requesting URL |
getRequestorType
protected Authenticator.RequestorType getRequestorType ()
Returns whether the requestor is a Proxy or a Server.
Returns | |
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Authenticator.RequestorType |
the authentication type of the requestor |