
* {
*     "access_token": "eeff86b8-66d5-428c-9c2b-9d1cce4d502a",
*     "token_type": "bearer",
*     "refresh_token": "7cc00001-ba52-473f-9c49-ee63f2ca1a0c",
*     "expires_in": 1799,
*     "scope": "read write trust"
* }

回执版本二

DefaultOAuth2AccessToken


* {
*  "additionalInformation": {},
*  "expiration": "2020-01-13 16:52:45",
*  "expired": false,
*  "expiresIn": 1598,
*  "refreshToken": {
*     "expiration": "2020-01-13 17:22:45",
*     "value": "a8ddb0a0-5872-4b70-aa12-3f0a4c4e9247"
*        },
*  "scope": [
*     "read",
*     "write",
*     "trust"
*  ],
*  "tokenType": "bearer",
*  "value": "2b576b11-cad8-4756-89e6-7090023407b2"
*}

2.回执DefaultOAuth2AccessToken类图

3.请求/oauth/token流程

3.1.CompositeTokenGranter.grant

3.1.1根据前端传参的grantType，匹配数组tokenGranters中的对应类型

granter.grant()方法如果grantType不匹配，就直接返回null。如果匹配就validateGrantType

3.1.2.validateGrantType看ClientDetails是否有对应的grantType的权限

这个set的值，是我们根据用户去在数据库保存的。

3.1.3.获取用户token

先从tokenStore获取有没有token，如果token存在，则校验是否过期，过期了则先清除刷新token，再清除该token。

有5种getAccessToken方式，我们如果用的是数据库，就是JdbcTokenStore

如果没有已经存在的token，则新建

新建的token类型正是DefaultOAuth2AccessToken

3.2.返回token

返回结果会通过通用的项目的WebMvcConfigurerAdapter进行序列化(因为实际上也是http请求的回执)

4.两个版本回执的原因

4.1.OAuth2AccessToken的序列化方式有两种

OAuth2AccessTokenJackson1Serializer

OAuth2AccessTokenJackson2Serializer

4.2.版本1回执OAuth2AccessTokenJackson2Serializer


{
    "access_token": "2de139d5-4b8e-49d0-baf4-1f37a9b3796d",
    "token_type": "bearer",
    "refresh_token": "f35dae51-c6d3-4a10-86b7-5f417834baa4",
    "expires_in": 1793,
    "scope": "read write trust"
}

4.3.版本2回执OAuth2AccessTokenJackson1Serializer


{
    "additionalInformation": {},
    "expiration": "2020-01-14 11:07:49",
    "expired": false,
    "expiresIn": 1798,
    "refreshToken": {
        "expiration": "2020-01-14 11:37:49",
        "value": "47ad8c7b-61f9-41db-bb7c-8a020efc38a1"
    },
    "scope": [
        "read",
        "write",
        "trust"
    ],
    "tokenType": "bearer",
    "value": "6a49bff9-2f70-41cb-b83b-209294c45c0c"
}

4.4.回执版本变化的原因

Spring Security Oauth2 返回非标准数据结构 OAuth2AccessToken 序列化问题_yuelangyc的专栏-CSDN博客 https://blog.csdn.net/yuelangyc/article/details/88235639

如文章所述，如果自定义了消息处理，覆盖了默认的消息处理器。

使用 fastjson 时， spring security oauth2 获取 token 格式变化 · Issue #1640 · alibaba/fastjson https://github.com/alibaba/fastjson/issues/1640

针对fastjson，确实存在自定义fastjson消息处理器时，出现回执版本变化。

4.5.fastJSON使用默认回执数据结构

参考上面的文章

你需要自行写个HttpMessageConverter来转换OAuth2AccessToken，fastjson本身也意识到这个问题，但是FormOAuth2AccessTokenMessageConverter这个类的writeInternal方法没有进行实现，你需要自行实现转换


public class OAuth2AccessTokenMessageConverter extends AbstractHttpMessageConverter<OAuth2AccessToken> {
 
    private final FastJsonHttpMessageConverter delegateMessageConverter;
 
    public OAuth2AccessTokenMessageConverter() {
        super(MediaType.APPLICATION_JSON);
        this.delegateMessageConverter = new FastJsonHttpMessageConverter();
    }
 
    @Override
    protected boolean supports(Class<?> clazz) {
        return OAuth2AccessToken.class.isAssignableFrom(clazz);
    }
 
    @Override
    protected OAuth2AccessToken readInternal(Class<? extends OAuth2AccessToken> clazz, HttpInputMessage inputMessage)
            throws IOException, HttpMessageNotReadableException {
        throw new UnsupportedOperationException(
                "This converter is only used for converting from externally acquired form data");
    }
 
    @Override
    protected void writeInternal(OAuth2AccessToken accessToken, HttpOutputMessage outputMessage) throws IOException,
            HttpMessageNotWritableException {
        Map<String, Object> data = new HashMap<>(8);
        data.put(OAuth2AccessToken.ACCESS_TOKEN, accessToken.getValue());
        data.put(OAuth2AccessToken.TOKEN_TYPE, accessToken.getTokenType());
        data.put(OAuth2AccessToken.EXPIRES_IN, accessToken.getExpiresIn());
        data.put(OAuth2AccessToken.SCOPE, String.join(" ", accessToken.getScope()));
        OAuth2RefreshToken refreshToken = accessToken.getRefreshToken();
        if (Objects.nonNull(refreshToken)) {
            data.put(OAuth2AccessToken.REFRESH_TOKEN, refreshToken.getValue());
        }
        delegateMessageConverter.write(data, MediaType.APPLICATION_JSON, outputMessage);
    }
 
}

注意：上面问题回答针对的只是OAuth2AccessToken，所以实际上，如果我们的项目还有其他的http请求需要处理，则需要修改上面的转换器，只处理token的回执保持兼容，其他请求的回执仍然保持原样


public class OAuth2AccessTokenMessageConverter extends AbstractHttpMessageConverter<Object> { //这里替换成Object
    
    @Override
    protected Object readInternal(Class<? extends OAuth2AccessToken> clazz, HttpInputMessage inputMessage)
            throws IOException, HttpMessageNotReadableException {
        //需要写自己的转换规则
    }
    
    @Override
    protected void writeInternal(Object t, HttpOutputMessage outputMessage) throws IOException, HttpMessageNotWritableException {
        String jsonString = JSON.toJSONString(t);
        if (t instanceof DefaultOAuth2AccessToken) {
            DefaultOAuth2AccessToken oAuth2AccessToken = JSON.parseObject(jsonString, DefaultOAuth2AccessToken.class);
            Map<String, Object> data = new HashMap<>(8);
            data.put(OAuth2AccessToken.ACCESS_TOKEN, oAuth2AccessToken.getValue());
            data.put(OAuth2AccessToken.TOKEN_TYPE, oAuth2AccessToken.getTokenType());
            data.put(OAuth2AccessToken.EXPIRES_IN, oAuth2AccessToken.getExpiresIn());
            data.put(OAuth2AccessToken.SCOPE, String.join(" ", oAuth2AccessToken.getScope()));
 
            //获取refreshToken
            JSONObject jsonObject = JSON.parseObject(jsonString);
            String refreshTokenString = jsonObject.getString("refreshToken");
            if (Objects.nonNull(refreshTokenString)) {
                data.put(OAuth2AccessToken.REFRESH_TOKEN, JSONObject.parseObject(refreshTokenString).getString("value"));
            }
            jsonString = JSON.toJSONString(data);
        }
        StreamUtils.copy(jsonString, DEFAULT_CHARSET, outputMessage.getBody());
    }
 
}

加入MessageConverters


@Configuration
public class Oauth2WebMvcConfigurer implements WebMvcConfigurer {
 
    @Override
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
       converters.add(0, new OAuth2AccessTokenMessageConverter());
    }
}

你可以参考OAuth2AccessToken这个序列化类OAuth2AccessTokenJackson2Serializer进行编写相应的代码

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