接口返回数据脱敏

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接口返回的隐私数据脱敏

实现方式

通过自定义注解，在脱敏的字段加上，并指定脱敏操作。

自定义代码

自定义数据注解

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@Target({ElementType.FIELD, ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface DataMasking {
    DataMaskingFunc maskFunc() default DataMaskingFunc.NO_MASK;
}

自定义Serializer

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public interface DataMaskingOperation {

    String MASK_CHAR = "*";
    
    String mask(String content, String maskChar);

}

public enum DataMaskingFunc {

     /**
     *  脱敏转换器
     */
     NO_MASK((str, maskChar) -> {
        return str;
     }),
     ALL_MASK((str, maskChar) -> {
        if (StringUtils.hasLength(str)) {
            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < str.length(); i++) {
                sb.append(StringUtils.hasLength(maskChar) ? maskChar : DataMaskingOperation.MASK_CHAR);
            }
            return sb.toString();
        } else {
            return str;
        }
    });

    private final DataMaskingOperation operation;

    private DataMaskingFunc(DataMaskingOperation operation) {
        this.operation = operation;
    }

    public DataMaskingOperation operation() {
        return this.operation;
    }

}

public final class DataMaskingSerializer extends StdScalarSerializer<Object> {
    private final DataMaskingOperation operation;

    public DataMaskingSerializer() {
        super(String.class, false);
        this.operation = null;
    }

    public DataMaskingSerializer(DataMaskingOperation operation) {
        super(String.class, false);
        this.operation = operation;
    }


    public boolean isEmpty(SerializerProvider prov, Object value) {
        String str = (String)value;
        return str.isEmpty();
    }

    public void serialize(Object value, JsonGenerator gen, SerializerProvider provider) throws IOException {
        if (Objects.isNull(operation)) {
            String content = DataMaskingFunc.ALL_MASK.operation().mask((String) value, null);
            gen.writeString(content);
        } else {
            String content = operation.mask((String) value, null);
            gen.writeString(content);
        }
    }

    public final void serializeWithType(Object value, JsonGenerator gen, SerializerProvider provider, TypeSerializer typeSer) throws IOException {
        this.serialize(value, gen, provider);
    }

    public JsonNode getSchema(SerializerProvider provider, Type typeHint) {
        return this.createSchemaNode("string", true);
    }

    public void acceptJsonFormatVisitor(JsonFormatVisitorWrapper visitor, JavaType typeHint) throws JsonMappingException {
        this.visitStringFormat(visitor, typeHint);
    }
}

自定义AnnotationIntrospector，适配我们自定义注解返回相应的Serializer

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@Slf4j
public class DataMaskingAnnotationIntrospector extends NopAnnotationIntrospector {

    @Override
    public Object findSerializer(Annotated am) {
        DataMasking annotation = am.getAnnotation(DataMasking.class);
        if (annotation != null) {
            return new DataMaskingSerializer(annotation.maskFunc().operation());
        }
        return null;
    }

}

覆盖ObjectMapper

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@Configuration(
        proxyBeanMethods = false
)
public class DataMaskConfiguration {

    @Configuration(
            proxyBeanMethods = false
    )
    @ConditionalOnClass({Jackson2ObjectMapperBuilder.class})
    static class JacksonObjectMapperConfiguration {
        JacksonObjectMapperConfiguration() {
        }

        @Bean
        @Primary
        ObjectMapper jacksonObjectMapper(Jackson2ObjectMapperBuilder builder) {
            ObjectMapper objectMapper = builder.createXmlMapper(false).build();
            AnnotationIntrospector ai = objectMapper.getSerializationConfig().getAnnotationIntrospector();
            AnnotationIntrospector newAi = AnnotationIntrospectorPair.pair(ai, new DataMaskingAnnotationIntrospector());
            objectMapper.setAnnotationIntrospector(newAi);
            return objectMapper;
        }
    }

}

返回对象加上注解

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public class User implements Serializable {
    /**
     * 主键ID
     */
    private Long id;

    /**
     * 姓名
     */
    @DataMasking(maskFunc = DataMaskingFunc.ALL_MASK)
    private String name;

    /**
     * 年龄
     */
    private Integer age;

    /**
     * 邮箱
     */
    @DataMasking(maskFunc = DataMaskingFunc.ALL_MASK)
    private String email;

}