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package javax.security.auth.message.module;

import java.util.Map;
import javax.security.auth.Subject;
import javax.security.auth.callback.CallbackHandler;

import javax.security.auth.message.*;

// just for @see tag
import javax.security.auth.message.config.ClientAuthContext;

/**
 * A ClientAuthModule secures request messages, and validates received
 * response messages.
 *
 * <p> A module implementation should assume it may be used to secure
 * different requests as different clients. A module should also assume
 * it may be used concurrently by multiple callers.  It is the module
 * implementation's responsibility to properly save and restore any state
 * as necessary.  A module that does not need to do so
 * may remain completely stateless.
 *
 * <p> Every implementation of the interface must provide a public zero 
 * argument contructor.
 *
 * @version %I%, %G%
 *
 * @see ClientAuthContext
 */
public interface ClientAuthModule extends ClientAuth {

    /**
     * Initialize this module with request and response message policies
     * to enforce, a CallbackHandler, and any module-specific configuration
     * properties.
     *
     * <p> The request policy and the response policy must not both be null.
     *
     * @param requestPolicy The request policy this module must enforce,
     *		or null.
     *
     * @param responsePolicy The response policy this module must enforce,
     *		or null.
     *
     * @param handler CallbackHandler used to request information.
     *
     * @param options A Map of module-specific configuration properties.
     *
     * @exception AuthException If module initialization fails, including for
     * the case where the options argument contains elements that are not 
     * supported by the module.
     */

    void initialize(MessagePolicy requestPolicy,
	       MessagePolicy responsePolicy,
	       CallbackHandler handler,
	       Map options)
	throws AuthException;

    /**
     * Get the one or more Class objects representing the message types 
     * supported by the module.
     *
     * @return An array of Class objects where each element 
     * defines a message type supported by the module. 
     * A module should return an array containing at
     * least one element. An empty array indicates that the module
     * will attempt to support any message type. This method
     * never returns null. 
     */
    public Class[] getSupportedMessageTypes();

}