com.crossoverjie.distributed.intercept.WebIntercept Maven / Gradle / Ivy
package com.crossoverjie.distributed.intercept;
import com.crossoverjie.distributed.annotation.ControllerLimit;
import com.crossoverjie.distributed.limit.RedisLimit;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Function:
*
* @author crossoverJie
* Date: 26/04/2018 21:03
* @since JDK 1.8
*/
@Component
public class WebIntercept extends WebMvcConfigurerAdapter {
private static Logger logger = LoggerFactory.getLogger(WebIntercept.class);
@Autowired
private RedisLimit redisLimit;
@Override
public void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(new CustomInterceptor())
.addPathPatterns("/**");
}
private class CustomInterceptor extends HandlerInterceptorAdapter {
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response,
Object handler) throws Exception {
if (redisLimit == null) {
throw new NullPointerException("redisLimit is null");
}
if (handler instanceof HandlerMethod) {
HandlerMethod method = (HandlerMethod) handler;
ControllerLimit annotation = method.getMethodAnnotation(ControllerLimit.class);
if (annotation == null) {
//skip
return true;
}
boolean limit = redisLimit.limit();
if (!limit) {
logger.warn("request has bean limited");
response.sendError(500, "request limited");
return false;
}
}
return true;
}
}
}