Added in API level 1

Authenticator

abstract class Authenticator

kotlin.Any
↳	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

Nested classes
	RequestorType The type of the entity requesting authentication.

Public constructors
Authenticator()

Public methods
open static PasswordAuthentication!	requestPasswordAuthentication(addr: InetAddress!, port: Int, protocol: String!, prompt: String!, scheme: String!) Ask the authenticator that has been registered with the system for a password.
open static PasswordAuthentication!	requestPasswordAuthentication(host: String!, addr: InetAddress!, port: Int, protocol: String!, prompt: String!, scheme: String!) Ask the authenticator that has been registered with the system for a password.
open static PasswordAuthentication!	requestPasswordAuthentication(host: String!, addr: InetAddress!, port: Int, protocol: String!, prompt: String!, scheme: String!, url: URL!, reqType: Authenticator.RequestorType!) Ask the authenticator that has been registered with the system for a password.
open static Unit	setDefault(a: Authenticator!) Sets the authenticator that will be used by the networking code when a proxy or an HTTP server asks for authentication.

Protected methods
open PasswordAuthentication!	getPasswordAuthentication() Called when password authorization is needed.
String!	getRequestingHost() Gets the hostname of the site or proxy requesting authentication, or null if not available.
Int	getRequestingPort() Gets the port number for the requested connection.
String!	getRequestingPrompt() Gets the prompt string given by the requestor.
String!	getRequestingProtocol() Give the protocol that's requesting the connection.
String!	getRequestingScheme() Gets the scheme of the requestor (the HTTP scheme for an HTTP firewall, for example).
InetAddress!	getRequestingSite() Gets the InetAddress of the site requesting authorization, or null if not available.
open URL!	getRequestingURL() Returns the URL that resulted in this request for authentication.
open Authenticator.RequestorType!	getRequestorType() Returns whether the requestor is a Proxy or a Server.

Public constructors

Authenticator

Added in API level 1

Authenticator()

Public methods

requestPasswordAuthentication

Added in API level 1

open static fun requestPasswordAuthentication(
    addr: InetAddress!, 
    port: Int, 
    protocol: String!, 
    prompt: String!, 
    scheme: String!
): PasswordAuthentication!

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 (java.net.Authenticator#getRequestingProtocol())
prompt	String!: A prompt string for the user
scheme	String!: The authentication scheme

Return
PasswordAuthentication!	The username/password, or null if one can't be gotten.

Exceptions
java.lang.SecurityException	if a security manager exists and its checkPermission method doesn't allow the password authentication request.

See Also

• java.net.NetPermission

requestPasswordAuthentication

Added in API level 1

open static fun requestPasswordAuthentication(
    host: String!, 
    addr: InetAddress!, 
    port: Int, 
    protocol: String!, 
    prompt: String!, 
    scheme: String!
): PasswordAuthentication!

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 (java.net.Authenticator#getRequestingProtocol())
prompt	String!: A prompt string for the user which identifies the authentication realm.
scheme	String!: The authentication scheme

Return
PasswordAuthentication!	The username/password, or null if one can't be gotten.

Exceptions
java.lang.SecurityException	if a security manager exists and its checkPermission method doesn't allow the password authentication request.

See Also

• java.net.NetPermission

requestPasswordAuthentication

Added in API level 1

open static fun requestPasswordAuthentication(
    host: String!, 
    addr: InetAddress!, 
    port: Int, 
    protocol: String!, 
    prompt: String!, 
    scheme: String!, 
    url: URL!, 
    reqType: Authenticator.RequestorType!
): PasswordAuthentication!

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
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 (java.net.Authenticator#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.

Return
PasswordAuthentication!	The username/password, or null if one can't be gotten.

Exceptions
java.lang.SecurityException	if a security manager exists and its checkPermission method doesn't allow the password authentication request.

See Also

• java.net.NetPermission

setDefault

Added in API level 1

open static fun setDefault(a: Authenticator!): Unit

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
a	Authenticator!: The authenticator to be set. If a is null then any previously set authenticator is removed.

Exceptions
java.lang.SecurityException	if a security manager exists and its checkPermission method doesn't allow setting the default authenticator.

See Also

• java.net.NetPermission

Protected methods

getPasswordAuthentication

Added in API level 1

protected open fun getPasswordAuthentication(): PasswordAuthentication!

Called when password authorization is needed. Subclasses should override the default implementation, which returns null.

Return
PasswordAuthentication!	The PasswordAuthentication collected from the user, or null if none is provided.

getRequestingHost

Added in API level 1

protected fun getRequestingHost(): String!

Gets the hostname of the site or proxy requesting authentication, or null if not available.

Return
String!	the hostname of the connection requiring authentication, or null if it's not available.

getRequestingPort

Added in API level 1

protected fun getRequestingPort(): Int

Gets the port number for the requested connection.

Return
Int	an int indicating the port for the requested connection.

getRequestingPrompt

Added in API level 1

protected fun getRequestingPrompt(): String!

Gets the prompt string given by the requestor.

Return
String!	the prompt string given by the requestor (realm for http requests)

getRequestingProtocol

Added in API level 1

protected fun getRequestingProtocol(): String!

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
String!	the protocol, optionally followed by "/version", where version is a version number.

See Also

• java.net.URL#getProtocol()

getRequestingScheme

Added in API level 1

protected fun getRequestingScheme(): String!

Gets the scheme of the requestor (the HTTP scheme for an HTTP firewall, for example).

Return
String!	the scheme of the requestor

getRequestingSite

Added in API level 1

protected fun getRequestingSite(): InetAddress!

Gets the InetAddress of the site requesting authorization, or null if not available.

Return
InetAddress!	the InetAddress of the site requesting authorization, or null if it's not available.

getRequestingURL

Added in API level 1

protected open fun getRequestingURL(): URL!

Returns the URL that resulted in this request for authentication.

Return
URL!	the requesting URL

getRequestorType

Added in API level 1

protected open fun getRequestorType(): Authenticator.RequestorType!

Returns whether the requestor is a Proxy or a Server.

Return
Authenticator.RequestorType!	the authentication type of the requestor