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Spring Security OAuth2 缓存使用jackson序列化的处理

不知道这个问题有没有人遇到或者处理过，Spring Security OAuth2的tokenStore的redis缓存默认的序列化策略是jdk序列化，这意味着redis里面的值是无法阅读的状态，而且这个缓存也无法被其他语言的web应用所使用，于是就打算使用最常见的json序列化策略来存储。

这个问题想处理很久了，虽然现在也能正常使用，但是之前一直没有时间仔细的去研究解决方案，所以今天花了些时间搞定并分享给大家。

RedisTokenStore中序列化策略的声明代码如下：

private RedisTokenStoreSerializationStrategy serializationStrategy = new JdkSerializationStrategy();
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改为json序列化需要实现接口 RedisTokenStoreSerializationStrategy，该接口在Spring的源码中并没有提供json序列化策略的实现，可见Spring官方并没有对OAuth2默认支持json序列化。

由于项目需要，并没有在RedisTokenStore中注入新的SerializationStrategy，而是重写了TokenStore，本质是没有区别的。 在TokenStore中创建一个GenericJackson2JsonRedisSerializer对象，并不是RedisTokenStoreSerializationStrategy的实现，反正只要能对对象进行序列化和反序列化就行了，相关代码如下：

  private val jacksonSerializer = buildSerializer()
  
  private fun buildMapper(): ObjectMapper {
    val mapper = createObjectMapper()
    mapper.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL, JsonTypeInfo.As.PROPERTY)
    mapper.disable(MapperFeature.AUTO_DETECT_SETTERS)
    mapper.registerModule(CoreJackson2Module())
    mapper.registerModule(WebJackson2Module())
    return mapper
  }

  private fun buildSerializer(): GenericJackson2JsonRedisSerializer {
    return GenericJackson2JsonRedisSerializer(buildMapper())
  }
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以为这样就OK了吗，too young！

来看一下对 OAuth2AccessToken 进行序列化的时候发生了什么

org.springframework.data.redis.serializer.SerializationException: Could not write JSON: Type id handling not implemented for type org.springframework.security.oauth2.common.OAuth2AccessToken (by serializer of type org.springframework.security.oauth2.common.OAuth2AccessTokenJackson2Serializer); nested exception is com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Type id handling not implemented for type org.springframework.security.oauth2.common.OAuth2AccessToken (by serializer of type org.springframework.security.oauth2.common.OAuth2AccessTokenJackson2Serializer)
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我们再来看看 OAuth2AccessToken 的源码

@org.codehaus.jackson.map.annotate.JsonSerialize(using = OAuth2AccessTokenJackson1Serializer.class)
@org.codehaus.jackson.map.annotate.JsonDeserialize(using = OAuth2AccessTokenJackson1Deserializer.class)
@com.fasterxml.jackson.databind.annotation.JsonSerialize(using = OAuth2AccessTokenJackson2Serializer.class)
@com.fasterxml.jackson.databind.annotation.JsonDeserialize(using = OAuth2AccessTokenJackson2Deserializer.class)

public interface OAuth2AccessToken {
……
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没错，Spring提供了对jackson序列化的支持，而且1.x和2.x都有。But，为什么还是会报错呢，我们来看一下 OAuth2AccessTokenJackson1Serializer 做了什么


public OAuth2AccessTokenJackson1Serializer() {
    super(OAuth2AccessToken.class);
}

@Override
public void serialize(OAuth2AccessToken token, JsonGenerator jgen, SerializerProvider provider) throws IOException,
	JsonGenerationException {
...
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这个Serializer的代码在刚才的报错中并没有执行，也就是说在序列化之前就报错了，这是为什么呢？因为它缺了点东西：

override fun serializeWithType(token: OAuth2AccessToken, jgen: JsonGenerator, serializers: SerializerProvider,
                                 typeSer: TypeSerializer?) {
    ser(token, jgen, serializers, typeSer)
}
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如果要在序列化时写入类型信息，必须要重载 serializeWithType 方法

所以我们需要自己写OAuth2AccessToken的Serializer：

/**
 *
 * @author 吴昊
 * @since 2.2.1
 */
class AccessTokenJackson2Serializer : StdSerializer<OAuth2AccessToken>(OAuth2AccessToken::class.java) {

  @Throws(IOException::class)
  override fun serialize(token: OAuth2AccessToken, jgen: JsonGenerator, provider: SerializerProvider) {
    ser(token, jgen, provider, null)
  }

  override fun serializeWithType(token: OAuth2AccessToken, jgen: JsonGenerator, serializers: SerializerProvider,
                                 typeSer: TypeSerializer?) {
    ser(token, jgen, serializers, typeSer)
  }

  private fun ser(token: OAuth2AccessToken, jgen: JsonGenerator, provider: SerializerProvider, typeSer: TypeSerializer?) {
    jgen.writeStartObject()
    if (typeSer != null) {
      jgen.writeStringField(typeSer.propertyName, token::class.java.name)
    }
    jgen.writeStringField(OAuth2AccessToken.ACCESS_TOKEN, token.value)
    jgen.writeStringField(OAuth2AccessToken.TOKEN_TYPE, token.tokenType)
    val refreshToken = token.refreshToken
    if (refreshToken != null) {
      jgen.writeStringField(OAuth2AccessToken.REFRESH_TOKEN, refreshToken.value)
    }
    val expiration = token.expiration
    if (expiration != null) {
      val now = System.currentTimeMillis()
      jgen.writeNumberField(OAuth2AccessToken.EXPIRES_IN, (expiration.time - now) / 1000)
    }
    val scope = token.scope
    if (scope != null && !scope.isEmpty()) {
      val scopes = StringBuffer()
      for (s in scope) {
        Assert.hasLength(s, "Scopes cannot be null or empty. Got $scope")
        scopes.append(s)
        scopes.append(" ")
      }
      jgen.writeStringField(OAuth2AccessToken.SCOPE, scopes.substring(0, scopes.length - 1))
    }
    val additionalInformation = token.additionalInformation
    for (key in additionalInformation.keys) {
      jgen.writeObjectField(key, additionalInformation[key])
    }
    jgen.writeEndObject()
  }

}
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反序列化的Deserializer也要重写：

fun JsonNode.readJsonNode(field: String): JsonNode? {
  return if (this.has(field)) {
    this.get(field)
  } else {
    null
  }
}

/**
 *
 * @author 吴昊
 * @since 2.2.1
 */
class AccessTokenJackson2Deserializer : StdDeserializer<OAuth2AccessToken>(OAuth2AccessToken::class.java) {

  @Throws(IOException::class, JsonProcessingException::class)
  override fun deserialize(jp: JsonParser, ctxt: DeserializationContext): OAuth2AccessToken {
    val additionalInformation = LinkedHashMap<String, Any>()
    val mapper = jp.codec as ObjectMapper
    val jsonNode = mapper.readTree<JsonNode>(jp)
    val tokenValue: String? = jsonNode.readJsonNode(ACCESS_TOKEN)?.asText()
    val tokenType: String? = jsonNode.readJsonNode(TOKEN_TYPE)?.asText()
    val refreshToken: String? = jsonNode.readJsonNode(REFRESH_TOKEN)?.asText()
    val expiresIn: Long? = jsonNode.readJsonNode(EXPIRES_IN)?.asLong()
    val scopeNode = jsonNode.readJsonNode(SCOPE)
    val scope: Set<String>? = if (scopeNode != null) {
      if (scopeNode.isArray) {
        scopeNode.map {
          it.asText()
        }.toSet()
      } else {
        OAuth2Utils.parseParameterList(scopeNode.asText())
      }
    } else {
      null
    }
    jsonNode.fieldNames().asSequence().filter {
      it !in listOf(
          ACCESS_TOKEN, TOKEN_TYPE, REFRESH_TOKEN, EXPIRES_IN, SCOPE
      )
    }.forEach { name ->
      additionalInformation[name] = mapper.readValue(jsonNode.get(name).traverse(mapper),
          Any::class.java)
    }
    // TODO What should occur if a required parameter (tokenValue or tokenType) is missing?
    val accessToken = DefaultOAuth2AccessToken(tokenValue)
    accessToken.tokenType = tokenType
    if (expiresIn != null) {
      accessToken.expiration = Date(System.currentTimeMillis() + expiresIn * 1000)
    }
    if (refreshToken != null) {
      accessToken.refreshToken = DefaultOAuth2RefreshToken(refreshToken)
    }
    accessToken.scope = scope
    accessToken.additionalInformation = additionalInformation

    return accessToken
  }

  override fun deserializeWithType(jp: JsonParser, ctxt: DeserializationContext, typeDeserializer: TypeDeserializer?): Any {
    return des(jp, ctxt, typeDeserializer)
  }

  private fun des(jp: JsonParser, ctxt: DeserializationContext, typeDeserializer: TypeDeserializer?): DefaultOAuth2AccessToken {
    return des(jp, ctxt, typeDeserializer)
  }

  @Throws(JsonParseException::class, IOException::class)
  private fun parseScope(jp: JsonParser): Set<String> {
    val scope: MutableSet<String>
    if (jp.currentToken == JsonToken.START_ARRAY) {
      scope = TreeSet()
      while (jp.nextToken() != JsonToken.END_ARRAY) {
        scope.add(jp.valueAsString)
      }
    } else {
      val text = jp.text
      scope = OAuth2Utils.parseParameterList(text)
    }
    return scope
  }

}

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但是，如何覆盖OAuth2AccessToken接口上的注解呢？使用jackson的注解混入，创建混入类：

/**
 *
 * @author 吴昊
 * @since 2.2.1
 */
@JsonTypeInfo(use = JsonTypeInfo.Id.CLASS, property = "@class")
@com.fasterxml.jackson.databind.annotation.JsonSerialize(using = AccessTokenJackson2Serializer::class)
@com.fasterxml.jackson.databind.annotation.JsonDeserialize(using = AccessTokenJackson2Deserializer::class)
abstract class AccessTokenMixIn
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这个类是abstract抑或不是并没有什么关系，jackson只会读取类上的注解

mapper中注册混入类

mapper.addMixIn(OAuth2AccessToken::class.java, AccessTokenMixIn::class.java)
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可以正确序列化和反序列化了吗，是的，可以了。但是，还没有结束，因为TokenStore中不仅要序列化OAuth2AccessToken，还要序列化OAuth2Authentication： 看一下错误：

org.springframework.data.redis.serializer.SerializationException: Could not read JSON: Cannot construct instance of `org.springframework.security.oauth2.provider.OAuth2Authentication` (no Creators, like default construct, exist): cannot deserialize from Object value (no delegate- or property-based Creator)
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OAuth2Authentication 因为没有默认构造函数，不能反序列化（序列化是可以的）

实现OAuth2Authentication的deserializer

/**
 *
 * @author 吴昊
 * @since 2.2.1
 */
class OAuth2AuthenticationDeserializer : JsonDeserializer<OAuth2Authentication>() {

  @Throws(IOException::class, JsonProcessingException::class)
  override fun deserialize(jp: JsonParser, ctxt: DeserializationContext): OAuth2Authentication {
    var token: OAuth2Authentication? = null
    val mapper = jp.codec as ObjectMapper
    val jsonNode = mapper.readTree<JsonNode>(jp)
    val requestNode = jsonNode.readJsonNode("storedRequest")
    val userAuthenticationNode = jsonNode.readJsonNode("userAuthentication")
    val request = mapper.readValue(requestNode!!.traverse(mapper), OAuth2Request::class.java)
    var auth: Authentication? = null
    if (userAuthenticationNode != null && userAuthenticationNode !is MissingNode) {
      auth = mapper.readValue(userAuthenticationNode.traverse(mapper),
          UsernamePasswordAuthenticationToken::class.java)
    }
    token = OAuth2Authentication(request, auth)
    val detailsNode = jsonNode.readJsonNode("details")
    if (detailsNode != null && detailsNode !is MissingNode) {
      token.details = mapper.readValue(detailsNode.traverse(mapper), OAuth2AuthenticationDetails::class.java)
    }
    return token
  }

}
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混入类

/**
 *
 * @author 吴昊
 * @since 2.2.1
 */
@JsonTypeInfo(use = JsonTypeInfo.Id.CLASS, property = "@class")
@JsonAutoDetect(fieldVisibility = JsonAutoDetect.Visibility.ANY, getterVisibility = JsonAutoDetect.Visibility.NONE, isGetterVisibility = JsonAutoDetect.Visibility.NONE)
@JsonDeserialize(using = OAuth2AuthenticationDeserializer::class)
internal abstract class OAuth2AuthenticationMixin
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限于篇幅，不再过多的讲述其他问题，需要注意的是，mapper还是需要注册两个module，是Spring源码中提供的

mapper.registerModule(CoreJackson2Module())
mapper.registerModule(WebJackson2Module())
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这样jackson才能完全正确的序列化 OAuth2AccessToken 和 OAuth2Authentication

悦读

道可道，非常道；名可名，非常名。 无名，天地之始，有名，万物之母。 故常无欲，以观其妙，常有欲，以观其徼。 此两者，同出而异名，同谓之玄，玄之又玄，众妙之门。

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