CompositeAuthenticationManager.java example

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uaa-master
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 *     Cloud Foundry 
 *     Copyright (c) [2009-2016] Pivotal Software, Inc. All Rights Reserved.
 *
 *     This product is licensed to you under the Apache License, Version 2.0 (the "License").
 *     You may not use this product except in compliance with the License.
 *
 *     This product includes a number of subcomponents with
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 *     subcomponents is subject to the terms and conditions of the
 *     subcomponent's license, as noted in the LICENSE file.
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package org.cloudfoundry.identity.uaa.authentication.manager;

import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.AuthenticationException;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.oauth2.provider.OAuth2Authentication;

public class CompositeAuthenticationManager implements AuthenticationManager {

    @Override
    public Authentication authenticate(Authentication authentication) throws AuthenticationException {
        Authentication a = SecurityContextHolder.getContext().getAuthentication();
        OAuth2Authentication oauth2Authentication = null;
        if (a instanceof OAuth2Authentication) {
            oauth2Authentication = (OAuth2Authentication) a;
        }

        if (oauth2Authentication != null) {
            return oauth2Authentication.getUserAuthentication();
        }
        else {
            return authentication;
        }
    }
}