Spring Boot+OAuth2，如何自定义返回的 Token 信息

在Spring Boot中，要自定义OAuth2返回的Token信息，你可以通过扩展TokenGranter接口来创建自定义的TokenGranter实现。以下是一个简单的例子，演示如何添加自定义的响应字段：

1. 创建自定义的TokenGranter实现：

import org.springframework.security.oauth2.common.DefaultOAuth2AccessToken;
import org.springframework.security.oauth2.provider.OAuth2Request;
import org.springframework.security.oauth2.provider.TokenGranter;
import org.springframework.security.oauth2.provider.token.AuthorizationServerTokenServices;
 
import java.util.LinkedHashMap;
import java.util.Map;
 
public class CustomTokenGranter implements TokenGranter {
    private final AuthorizationServerTokenServices tokenServices;
    private final TokenGranter delegate;
 
    public CustomTokenGranter(AuthorizationServerTokenServices tokenServices, TokenGranter delegate) {
        this.tokenServices = tokenServices;
        this.delegate = delegate;
    }
 
    @Override
    public OAuth2AccessToken grant(String grantType, TokenRequest tokenRequest) {
        OAuth2AccessToken token = delegate.grant(grantType, tokenRequest);
 
        if (token != null) {
            // 自定义响应字段
            Map<String, Object> additionalInformation = new LinkedHashMap<>(token.getAdditionalInformation());
            additionalInformation.put("custom_field", "custom_value");
 
            // 创建一个新的token，添加自定义信息
            DefaultOAuth2AccessToken customToken = new DefaultOAuth2AccessToken(token);
            customToken.setAdditionalInformation(additionalInformation);
 
            return customToken;
        }
 
        return token;
    }
}

2. 注册自定义TokenGranter：

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.oauth2.config.annotation.web.configuration.AuthorizationServerConfigurerAdapter;
import org.springframework.security.oauth2.provider.TokenGranter;
import org.springframework.security.oauth2.provider.token.AuthorizationServerTokenServices;
 
@Configuration
public class OAuth2Config extends AuthorizationServerConfigurerAdapter {
 
    private final TokenGranter tokenGranter;
    private final AuthorizationServerTokenServices tokenServices;
 
    public OAuth2Config(TokenGranter tokenGranter, AuthorizationServerTokenServices tokenServices) {
        this.tokenGranter = tokenGranter;
        this.tokenServices = tokenServices;
    }
 
    @Bean
    public TokenGranter tokenGrante