SpringBoot中间件之封装统一白名单配置

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public @interface DoWhiteList {
    /**
     * key：当前接口入参需要提取的属性
     * @return
     */
    String key() default "";
    /**
     * returnJson: 拦截用户请求后返回的提示msg
     * @return
     */
    String returnJson() default "";
}

/**
 * @ConfigurationProperties：用于创建指定前缀的自定义配置信息，这样就在ymL或者properties中读取到配置信息
 */
@ConfigurationProperties("com.whitelist")
public class WhiteListProperties {
    private String users;
    public String getUsers() {
        return users;
    }
    public void setUsers(String users) {
        this.users = users;
    }
}

/**
 *
 * @ConditionalOnMissingBean
 *  只会实例化一个Bean对象
 */
@Configuration
@EnableConfigurationProperties(WhiteListProperties.class)
public class WhiteListAutoConfigure {
    @Bean("whiteListConfig")
    @ConditionalOnMissingBean
    public String whiteListConfig(WhiteListProperties properties) {
        return properties.getUsers();
    }
}

@Aspect
@Component
public class DoJoinPoint {
    private Logger logger = LoggerFactory.getLogger(DoJoinPoint.class);
    @Resource
    private String whiteListConfig;
    @Pointcut("@annotation(cn.bugstack.middleware.whitelist.annotation.DoWhiteList)")
    public void aopPoint() {
    }
    @Around("aopPoint()")
    public Object doRouter(ProceedingJoinPoint jp) throws Throwable {
        // 获取内容
        Method method = getMethod(jp);
        DoWhiteList whiteList = method.getAnnotation(DoWhiteList.class);
        // 获取字段值
        String keyValue = getFiledValue(whiteList.key(), jp.getArgs());
        logger.info("middleware whitelist handler method：{} value：{}", method.getName(), keyValue);
        if (null == keyValue || "".equals(keyValue)) return jp.proceed();
        String[] split = whiteListConfig.split(",");
        // 白名单过滤
        for (String str : split) {
            if (keyValue.equals(str)) {
                return jp.proceed();
            }
        }
        // 拦截
        return returnObject(whiteList, method);
    }
    private Method getMethod(JoinPoint jp) throws NoSuchMethodException {
        Signature sig = jp.getSignature();
        MethodSignature methodSignature = (MethodSignature) sig;
        return jp.getTarget().getClass().getMethod(methodSignature.getName(), methodSignature.getParameterTypes());
    }
    // 返回对象
    private Object returnObject(DoWhiteList whiteList, Method method) throws IllegalAccessException, InstantiationException {
        Class<?> returnType = method.getReturnType();
        String returnJson = whiteList.returnJson();
        if ("".equals(returnJson)) {
            return returnType.newInstance();
        }
        return JSON.parseObject(returnJson, returnType);
    }
    // 获取属性值
    private String getFiledValue(String filed, Object[] args) {
        String filedValue = null;
        for (Object arg : args) {
            try {
                if (null == filedValue || "".equals(filedValue)) {
                    filedValue = BeanUtils.getProperty(arg, filed);
                } else {
                    break;
                }
            } catch (Exception e) {
                if (args.length == 1) {
                    return args[0].toString();
                }
            }
        }
        return filedValue;
    }
}