<%#
 Copyright 2013-2021 the original author or authors from the JHipster project.

 This file is part of the JHipster project, see https://www.jhipster.tech/
 for more information.

 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at

      https://www.apache.org/licenses/LICENSE-2.0

 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
-%>
package <%= packageName %>.security;

import org.springframework.security.oauth2.common.DefaultOAuth2AccessToken;
import org.springframework.security.oauth2.common.OAuth2AccessToken;
import org.springframework.security.oauth2.provider.OAuth2Authentication;
import org.springframework.security.oauth2.provider.token.TokenEnhancer;
import org.springframework.stereotype.Component;

import java.util.LinkedHashMap;
import java.util.Map;

/**
 * Adds the standard "iat" claim to tokens so we know when they have been created.
 * This is needed for a session timeout due to inactivity (ignored in case of "remember-me").
 */
@Component
public class IatTokenEnhancer implements TokenEnhancer {

    @Override
    public OAuth2AccessToken enhance(OAuth2AccessToken accessToken, OAuth2Authentication authentication) {
        addClaims((DefaultOAuth2AccessToken) accessToken);
        return accessToken;
    }

    private void addClaims(DefaultOAuth2AccessToken accessToken) {
        DefaultOAuth2AccessToken token = accessToken;
        Map<String, Object> additionalInformation = token.getAdditionalInformation();
        if (additionalInformation.isEmpty()) {
            additionalInformation = new LinkedHashMap<String, Object>();
        }
        //add "iat" claim with current time in secs
        //this is used for an inactive session timeout
        additionalInformation.put("iat", new Integer((int)(System.currentTimeMillis()/1000L)));
        token.setAdditionalInformation(additionalInformation);
    }
}