/*
 * Copyright 2020-2030 码匠君<herodotus@aliyun.com>
 *
 * Dante Engine 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
 *
 *    http://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.
 *
 * Dante Engine 是 Dante Cloud 系统核心组件库，采用 APACHE LICENSE 2.0 开源协议，您在使用过程中，需要注意以下几点：
 *
 * 1. 请不要删除和修改根目录下的LICENSE文件。
 * 2. 请不要删除和修改 Dante Engine 源码头部的版权声明。
 * 3. 请保留源码和相关描述文件的项目出处，作者声明等。
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 */

package org.dromara.dante.oauth2.authentication.customizer;

import org.apache.commons.lang3.ObjectUtils;
import org.springframework.security.authentication.AbstractAuthenticationToken;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.oauth2.core.oidc.endpoint.OidcParameterNames;
import org.springframework.security.oauth2.jwt.JwtClaimsSet;
import org.springframework.security.oauth2.server.authorization.OAuth2TokenType;
import org.springframework.security.oauth2.server.authorization.authentication.OAuth2ClientAuthenticationToken;
import org.springframework.security.oauth2.server.authorization.token.JwtEncodingContext;
import org.springframework.security.oauth2.server.authorization.token.OAuth2TokenCustomizer;

import java.util.HashMap;
import java.util.Map;

/**
 * <p>Description: 自定义 TokenCustomizer </p>
 * <p>
 * 用于自定义的 Herodotus User Details 解析。如果使用 Security 默认的 <code>org.springframework.security.core.userdetails.User</code> 则不需要使用该类
 * <p>
 * An OAuth2TokenCustomizer<JwtEncodingContext> declared with a generic type of JwtEncodingContext (implements OAuth2TokenContext) provides the ability to customize the headers and claims of a Jwt.
 *
 * @author : gengwei.zheng
 * @date : 2022/2/23 22:17
 */
public class HerodotusJwtTokenCustomizer extends AbstractTokenCustomizer implements OAuth2TokenCustomizer<JwtEncodingContext> {

    @Override
    public void customize(JwtEncodingContext context) {

        AbstractAuthenticationToken token = null;
        Authentication clientAuthentication = SecurityContextHolder.getContext().getAuthentication();
        if (clientAuthentication instanceof OAuth2ClientAuthenticationToken) {
            token = (OAuth2ClientAuthenticationToken) clientAuthentication;
        }

        if (ObjectUtils.isNotEmpty(token) && token.isAuthenticated()) {
            if (OAuth2TokenType.ACCESS_TOKEN.equals(context.getTokenType())) {
                Authentication authentication = context.getPrincipal();
                if (ObjectUtils.isNotEmpty(authentication)) {
                    Map<String, Object> attributes = new HashMap<>();
                    appendAll(attributes, authentication, context.getAuthorizedScopes());
                    JwtClaimsSet.Builder jwtClaimSetBuilder = context.getClaims();
                    jwtClaimSetBuilder.claims(claims -> claims.putAll(attributes));
                }
            }

            if (OidcParameterNames.ID_TOKEN.equals(context.getTokenType().getValue())) {
                Authentication authentication = context.getPrincipal();
                if (ObjectUtils.isNotEmpty(authentication)) {
                    Map<String, Object> attributes = new HashMap<>();
                    appendCommons(attributes, authentication, context.getAuthorizedScopes());
                    JwtClaimsSet.Builder jwtClaimSetBuilder = context.getClaims();
                    jwtClaimSetBuilder.claims(claims -> claims.putAll(attributes));
                }
            }
        }
    }
}
