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package org.apache.http.auth;

import org.apache.http.Header;
import org.apache.http.HttpRequest;

/**
 * This interface represents an abstract challenge-response oriented
 * authentication scheme.
 * 

* An authentication scheme should be able to support the following * functions: *

    *
  • Parse and process the challenge sent by the target server * in response to request for a protected resource *
  • Provide its textual designation *
  • Provide its parameters, if available *
  • Provide the realm this authentication scheme is applicable to, * if available *
  • Generate authorization string for the given set of credentials * and the HTTP request in response to the authorization challenge. *
*

* Authentication schemes may be stateful involving a series of * challenge-response exchanges. *

* IMPORTANT: implementations of this interface MUST also implement {@link ContextAwareAuthScheme} * interface in order to remain API compatible with newer versions of HttpClient. * * @since 4.0 */ public interface AuthScheme { /** * Processes the given challenge token. Some authentication schemes * may involve multiple challenge-response exchanges. Such schemes must be able * to maintain the state information when dealing with sequential challenges * * @param header the challenge header */ void processChallenge(final Header header) throws MalformedChallengeException; /** * Returns textual designation of the given authentication scheme. * * @return the name of the given authentication scheme */ String getSchemeName(); /** * Returns authentication parameter with the given name, if available. * * @param name The name of the parameter to be returned * * @return the parameter with the given name */ String getParameter(final String name); /** * Returns authentication realm. If the concept of an authentication * realm is not applicable to the given authentication scheme, returns * {@code null}. * * @return the authentication realm */ String getRealm(); /** * Tests if the authentication scheme is provides authorization on a per * connection basis instead of usual per request basis * * @return {@code true} if the scheme is connection based, {@code false} * if the scheme is request based. */ boolean isConnectionBased(); /** * Authentication process may involve a series of challenge-response exchanges. * This method tests if the authorization process has been completed, either * successfully or unsuccessfully, that is, all the required authorization * challenges have been processed in their entirety. * * @return {@code true} if the authentication process has been completed, * {@code false} otherwise. */ boolean isComplete(); /** * Produces an authorization string for the given set of {@link Credentials}. * * @param credentials The set of credentials to be used for athentication * @param request The request being authenticated * @throws AuthenticationException if authorization string cannot * be generated due to an authentication failure * * @return the authorization string * * @deprecated (4.1) Use {@link ContextAwareAuthScheme#authenticate(Credentials, HttpRequest, org.apache.http.protocol.HttpContext)} */ @Deprecated Header authenticate(Credentials credentials, HttpRequest request) throws AuthenticationException; }





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