太强了，一个注解搞定接口返回数据脱敏
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思路
代码
1. 自定义数据注解，并可以配置数据脱敏策略
@Target({ElementType.FIELD, ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface DataMasking {
DataMaskingFunc maskFunc() default DataMaskingFunc.NO_MASK;
}
2. 自定义Serializer，参考jackson的StringSerializer，下面的示例只针对String类型进行脱敏
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);
}
}
3. 自定义AnnotationIntrospector，适配我们自定义注解返回相应的Serializer
@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;
}
}
4. 覆盖ObjectMapper
@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;
}
}
}
5. 返回对象加上注解
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;
}
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