基于Jackson实现API接口数据脱敏

一、背景

用户的一些敏感数据，例如手机号、邮箱、身份证等信息，在数据库以明文存储（加密存储见《基于Mybatis-Plus拦截器实现MySQL数据加解密》）， 但在接口返回数据给浏览器（或三方客户端）时，希望对这些敏感数据进行脱敏。 同时在浏览器提交数据更新到后端接口时，后端接口需要判断敏感数据是否已脱敏，如果已脱敏则需要直接丢弃。

 

二、Jackson介绍

Jackson是SpringBoot默认的Json序列化和反序列化库，点击这里查看Jackson注解官方文档.

本文通过使用Jackson的@JsonSerialize注解实现序列化时脱敏操作，通过使用Jackson的@JsonDeserialize注解实现反序列化时脱敏数据检测并丢弃操作。

三、使用方法

该脱敏拦截器功能在wutong-base-api包（公司内部包）已经实现，如果您的项目已经依赖了base-api，就可以直接使用。

另外，在码云上有Demo案例，见: spring-jackson

基于wutong-base-api包的使用步骤如下。

1、添加wutong-base-api依赖

    com.talkweb
    wutong-base-api
    请使用最新版本

2、在yaml配置开关，启用加解密

spring:
  jackson:
    sensitive:
      # 序列化时是否对手机号进行脱敏，反序列化时是否过滤脱敏数据
      mobile: true
      # 序列化时是否对邮箱进行脱敏，反序列化时是否过滤脱敏数据
      email: true
      # 序列化时是否对身份证号进行脱敏，反序列化时是否过滤脱敏数据
      identity: true

3、定义VO类，使用Jackson注解实现数据脱敏

API接口出参(Rsp)，敏感数据序列化时脱敏

public class UserRspVO {
    private Long id;
    private String name;
    @JsonSerialize(using = CustomerJackSon.MobileSerialize.class)
    private String mobile;
    @JsonSerialize(using = CustomerJackSon.EmailSerialize.class)
    private String email;
    @JsonSerialize(using = CustomerJackSon.IdentitySerialize.class)
    private String identity;
}

API接口入参(Req)，过滤已脱敏的数据，直接丢弃

public class UserReqVO {
    private Long id;
    private String name;
    @JsonDeserialize(using = CustomerJackSon.MobileDeSerialize.class)
    private String mobile;
    @JsonDeserialize(using = CustomerJackSon.EmailDeSerialize.class)
    private String email;
    @JsonDeserialize(using = CustomerJackSon.IdentityDeSerialize.class)
    private String identity;
}

定义Controller接口

@RestController
@RequestMapping("/user")
public class UserController {

    @GetMapping
    public UserRspVO get() {
        UserRspVO rsp = new UserRspVO();
        rsp.setId(1L);
        rsp.setName("张三");
        rsp.setMobile("18866661234");
        rsp.setEmail("[email protected]");
        rsp.setIdentity("434113199901015566");
        return rsp;
    }

    @PutMapping
    public UserRspVO put(@RequestBody UserReqVO req) {
        System.out.println(req);
        UserRspVO rsp = new UserRspVO();
        BeanUtils.copyProperties(req, rsp);
        return rsp;
    }
}

接口请求示例：

GET http://localhost:8080/user

入参：
无

出参：
{
  "id": "1",
  "name": "张三",
  "mobile": "188****1234", // 配置了mobile=true
  "email": "[email protected]", // 配置了email=false
  "identity": "434113199901015566" // 未配置identity，默认为false
}

PUT http://127.0.0.1:8080/user

入参：
{
    "id": "12124",
    "name": "张三",
    "mobile": "188****1234",
    "email": "zh****@qq.com",
    "identity": "434***********5566"
}

Controller反序列化后接收到的数据：
{
    "id": "12124",
    "name": "张三",
    "mobile": null, // 配置了mobile=true
    "email": "zh****@qq.com", // 配置了email=false
    "identity": "434***********5566" // 未配置identity，默认为false
}

四、实现原理

1、SpringBoot定义变量实现脱敏开关

读取yaml配置

@ConfigurationProperties(prefix = "spring.jackson.sensitive")
public class JacksonProperties {
    private Boolean mobile;
    private Boolean email;
    private Boolean identity;
}

变量注入到JacksonConfig

@Configuration
@EnableConfigurationProperties(JacksonProperties.class)
public class JacksonConfig {
    @Bean
    public ObjectMapper objectMapper(JacksonProperties props) {
        ObjectMapper mapper = new ObjectMapper();
        ContextAttributes attrs = ContextAttributes.getEmpty()
                .withSharedAttribute("mobile", props.getMobile())
                .withSharedAttribute("email", props.getEmail())
                .withSharedAttribute("identity", props.getIdentity());
        mapper.setDefaultAttributes(attrs);
        return mapper;
    }
}

2、实现序列化、反序列化逻辑

public class CustomerJackSon {
    /**
     * 手机号脱敏序列化
     */
    public static class MobileSerialize extends JsonSerializer {
        @Override
        public void serialize(String value, JsonGenerator jsonGenerator, SerializerProvider serializerProvider) throws IOException {
            if (null == value || value.length() != 11) {
                jsonGenerator.writeString(value);
                return;
            }
            Boolean mobile = (Boolean) serializerProvider.getAttribute("mobile");
            if (null == mobile || !mobile) {
                jsonGenerator.writeString(value);
                return;
            }
            jsonGenerator.writeString(value.substring(0, 3) + "****" + value.substring(7));
        }
    }

    /**
     * 手机号脱敏数据检测并丢弃
     */
    public static class MobileDeSerialize extends JsonDeserializer {

        @Override
        public String deserialize(JsonParser p, DeserializationContext ctxt) throws IOException, JacksonException {
            String value = p.getText();
            if (null == value || value.length() != 11) {
                return value;
            }
            Boolean mobile = (Boolean) ctxt.getAttribute("mobile");
            if (null == mobile || !mobile) {
                return value;
            }
            if (value.contains("*")) {
                return null;
            }
            return value;
        }
    }

    /**
     * 邮箱脱敏序列化
     */
    public static class EmailSerialize extends JsonSerializer {
        @Override
        public void serialize(String value, JsonGenerator jsonGenerator, SerializerProvider serializerProvider) throws IOException {
            if (null == value || value.length() < 5) {
                jsonGenerator.writeString(value);
                return;
            }
            String[] split = value.split("@");
            if (split.length != 2 || split[0].length() < 2 || split[1].length() < 2) {
                jsonGenerator.writeString(value);
                return;
            }
            Boolean email = (Boolean) serializerProvider.getAttribute("email");
            if (null == email || !email) {
                jsonGenerator.writeString(value);
                return;
            }
            jsonGenerator.writeString(split[0].substring(0, 2) + "****@" + split[1]);
        }
    }

    /**
     * 邮箱脱敏数据检测并丢弃
     */
    public static class EmailDeSerialize extends JsonDeserializer {

        @Override
        public String deserialize(JsonParser p, DeserializationContext ctxt) throws IOException, JacksonException {
            String value = p.getText();
            if (null == value || value.length() < 5) {
                return value;
            }
            Boolean email = (Boolean) ctxt.getAttribute("email");
            if (null == email || !email) {
                return value;
            }
            if (value.contains("*")) {
                return null;
            }
            return value;
        }
    }

    /**
     * 身份证脱敏序列化
     */
    public static class IdentitySerialize extends JsonSerializer {
        @Override
        public void serialize(String value, JsonGenerator jsonGenerator, SerializerProvider serializerProvider) throws IOException {
            if (null == value || value.length() != 18) {
                jsonGenerator.writeString(value);
                return;
            }
            Boolean identity = (Boolean) serializerProvider.getAttribute("identity");
            if (null == identity || !identity) {
                jsonGenerator.writeString(value);
                return;
            }
            jsonGenerator.writeString(value.substring(0, 3) + "***********" + value.substring(14));
        }
    }

    /**
     * 身份证脱敏数据检测并丢弃
     */
    public static class IdentityDeSerialize extends JsonDeserializer {

        @Override
        public String deserialize(JsonParser p, DeserializationContext ctxt) throws IOException, JacksonException {
            String value = p.getText();
            if (null == value || value.length() != 18) {
                return value;
            }
            Boolean identity = (Boolean) ctxt.getAttribute("identity");
            if (null == identity || !identity) {
                return value;
            }
            if (value.contains("*")) {
                return null;
            }
            return value;
        }
    }
}