uk.ac.starlink.auth

Class Challenge

java.lang.Object

uk.ac.starlink.auth.Challenge

public class Challenge
extends Object

Represents and parses challenge specifications as defined by RFC7235.

Since:

9 Jun 2020

Author:

Mark Taylor

See Also:

RFC 7235

Constructor Summary

Constructors

Constructor and Description
Challenge(String schemeName, String token68) Constructs a challenge with token68 string
Challenge(String schemeName, String realm, Map<String,String> params) Constructs a challenge with an optional realm and auth parameters.

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object o)
Map<String,String>	getParams() Returns any auth parameters that form part of this challenge excluding the realm.
String	getRealm() Returns the authentication realm if defined.
String	getRequiredParameter(String key) Utility method giving a non-empty value for a named parameter of this challenge.
URL	getRequiredParameterUrl(String key) Utility method giving a non-null URL value for a named parameter of this challenge.
String	getRequiredRealm() Utility method giving a non-empty realm for this challenge.
String	getSchemeName() Returns the authentication scheme name.
String	getToken68() Returns the token68 value if defined.
int	hashCode()
static void	main(String[] args) Will parse a WWW-Authenticate string on the command line and print out the parsed challenges.
static List<Challenge>	parseChallenges(String challengeTxt) Parses the content of a WWW-Authenticate header as a sequence of RFC7235 challenges.
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

Challenge

public Challenge(String schemeName,
                 String realm,
                 Map<String,String> params)

Constructs a challenge with an optional realm and auth parameters.

Parameters:

schemeName - scheme name, case insensitive

realm - specified realm value, or null

params - additional parameters (excluding realm); keys are case insensitive and will be mapped to lower

Challenge

public Challenge(String schemeName,
                 String token68)

Constructs a challenge with token68 string

Parameters:

schemeName - scheme name, case insensitive

token68 - token68 string

Method Detail

getSchemeName

public String getSchemeName()

Returns the authentication scheme name.

Returns:

scheme name, case insensitive

getRealm

public String getRealm()

Returns the authentication realm if defined.

Returns:

realm or null

getToken68

public String getToken68()

Returns the token68 value if defined. If this is non-null, then there will be no parameters or realm.

Returns:

token68 or null

getParams

public Map<String,String> getParams()

Returns any auth parameters that form part of this challenge excluding the realm.

Returns:

name->value map giving parameters; parameter names have been normalised to lower case

getRequiredRealm

public String getRequiredRealm()
                        throws BadChallengeException

Utility method giving a non-empty realm for this challenge. If no realm has been defined, a BadChallengeException is thrown.

Returns:

non-empty realm string

Throws:

BadChallengeException - if there is no realm

getRequiredParameter

public String getRequiredParameter(String key)
                            throws BadChallengeException

Utility method giving a non-empty value for a named parameter of this challenge. If the named parameter has not been specified, a BadChallengeException is thrown.

Parameters:

key - parameter name, case-insensitive

Returns:

non-empty value for parameter key

Throws:

BadChallengeException - if no value is specified for key

getRequiredParameterUrl

public URL getRequiredParameterUrl(String key)
                            throws BadChallengeException

Utility method giving a non-null URL value for a named parameter of this challenge. If the named parameter is not specified or cannot be turned into a URL, a BadChallengeException is thrown.

Parameters:

key - parameter name, case-insensitive

Returns:

non-null URL for parameter key

Throws:

BadChallengeException - if no URL value is specified for key

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object o)

Overrides:

equals in class Object

toString

public String toString()

Overrides:

toString in class Object

parseChallenges

public static List<Challenge> parseChallenges(String challengeTxt)

Parses the content of a WWW-Authenticate header as a sequence of RFC7235 challenges. According to RFC7235 there should be at least one value in the result, but syntactically invalid challenge text is just ignored, so the result is not guaranteed to be non-empty.

Parameters:

challengeTxt - text as value of WWW-Authenticate header

Returns:

list of parsed challenges

main

public static void main(String[] args)

Will parse a WWW-Authenticate string on the command line and print out the parsed challenges.