/*
 * JBoss, the OpenSource J2EE webOS
 *
 * Distributable under LGPL license.
 * See terms of license at gnu.org.
 */
package org.jboss.security.plugins;

import java.io.Serializable;
import java.util.HashSet;
import java.util.Set;
import java.security.Principal;
import javax.security.auth.Subject;

import org.jboss.security.RealmMapping;
import org.jboss.security.SubjectSecurityManager;
import org.jboss.security.NobodyPrincipal;


/** An implementation of SubjectSecurityManager, RealmMapping does not allow
 any authentication and every check for a role fails.

@see #isValid(java.security.Principal, Object)
@see #getPrincipal(java.security.Principal)
@see #doesUserHaveRole(java.security.Principal, java.util.Set)

@author Scott.Stark@jboss.org
@version $Revision: 1.1.4.1 $
*/
public class NoAccessSecurityManager
    implements SubjectSecurityManager, RealmMapping, Serializable
{
    static final long serialVersionUID = -5922913661708382384L;
    private String securityDomain;

    /** Creates a default JaasSecurityManager for with the
        given securityDomain name.
    */
    public NoAccessSecurityManager(String securityDomain)
    {
        this.securityDomain = securityDomain;
    }

    /** Get the name of the security domain associated with this security mgr.
        @return Name of the security manager security domain.
     */
    public String getSecurityDomain()
    {
        return securityDomain;
    }
    /** Get the currently authenticated Subject.
        @return Always returns null.
     */
    public Subject getActiveSubject()
    {
        return null;
    }

    /** Validate that the given credential is correct for principal.
    @return always returns true.
     */
    public boolean isValid(Principal principal, Object credential)
    {
        return false;
    }
    /** Validate that the given credential is correct for principal. This does
     not populate the activeSubject with any state since no authentication
     is performed.
    @return always returns true.
     */
    public boolean isValid(Principal principal, Object credential,
      Subject activeSubject)
    {
       return false;
    }

    /** Always returns the argument principal.
    @return The argument principal
     */
    public Principal getPrincipal(Principal principal)
    {
        Principal result = principal;
        return result;
    }

    /** Does the current Subject have a role(a Principal) that equates to one
        of the role names. This method always returns true.
    @param principal - ignored.
    @param roleNames - ignored.
    @return Always returns true.
    */
    public boolean doesUserHaveRole(Principal principal, Set roleNames)
    {
        boolean hasRole = false;
        return hasRole;
    }

    /** Return the set of domain roles the principal has been assigned.
    @return The Set<Principal> with the NobodyPrincipal as the sole role.
     */
    public Set getUserRoles(Principal principal)
    {
        HashSet roles = new HashSet();
        roles.add(NobodyPrincipal.NOBODY_PRINCIPAL);
        return roles;
    }

    /** Authenticate principal against credential
     * @param principal - the user id to authenticate
     * @param credential - an opaque credential.
     * @return Always returns true.
     */
    private boolean authenticate(Principal principal, Object credential)
    {
        boolean authenticated = false;
        return authenticated;
    }
}