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/*
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 *
 * Copyright (c) 2013 Oracle and/or its affiliates. All rights reserved.
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 * and Distribution License("CDDL") (collectively, the "License").  You
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 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
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package org.glassfish.security.services.api.authentication;

import javax.security.auth.Subject;
import javax.security.auth.login.LoginException;

import org.jvnet.hk2.annotations.Contract;

/**
 * The Impersonation Service
 */
@Contract
public interface ImpersonationService {
    /**
     * Impersonate a user, specifying the user and group principal names that
     * should be established in the resulting Subject.
     * 
     * Note that, that this method always behaves as if virtual were true in the case
     * that the underlying user store provider does not support user lookup.
     * 
     * @param user The username.
     * @param groups An array of group names.  If virtual is true, group principals will be created
     * using this array.  If virtual is false and groups is non-null, it will be used to filter the
     * groups returned by the configured UserStoreProvider.
     * @param subject An optional Subject to receive principals and credentials for the logged in user.
     * If provided, it will be returned as the return value; if not, a new Subject will be returned.
     * @param virtual  If true, simply create a subject with the given user and group names.  If false, configured
     * UserStoreProvider will be queried for the given username and a Subject created only if the user exists.  Groups
     * will be populated with the intersection of the groups parameter and the groups returned by the UserStoreProvider.
     * 
     * @return A Subject representing the impersonated user.
     * 
     * @throws LoginException
     */
    public Subject impersonate(String user, String[] groups, Subject subject, boolean virtual)
            throws LoginException;
}