package com.schisandra.gateway.exception;

import cn.dev33.satoken.exception.SaTokenException;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.schisandra.gateway.entity.Result;
import org.springframework.boot.web.reactive.error.ErrorWebExceptionHandler;
import org.springframework.core.io.buffer.DataBufferFactory;
import org.springframework.http.MediaType;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

/**
 * @Classname GatewayExceptionHandler
 * @BelongsProject: schisandra-cloud-storage
 * @BelongsPackage: com.schisandra.club.gateway.exception
 * @Author: schisandra
 * @CreateTime: 2024-05-18  17:52
 * @Description: 网关全局异常处理
 * @Version: 1.0
 */
@Component
public class GatewayExceptionHandler implements ErrorWebExceptionHandler {
    private ObjectMapper objectMapper=new ObjectMapper();
    @Override
    public Mono<Void> handle(ServerWebExchange serverWebExchange, Throwable throwable) {
        ServerHttpRequest request = serverWebExchange.getRequest();
        ServerHttpResponse response = serverWebExchange.getResponse();
        int code=200;
        String message="";
        if(throwable instanceof SaTokenException){
            code=401;
            message="用户无权限";
        }else {
            code=500;
            message="系统繁忙";
        }
        Result result = Result.fail(code, message);
        response.getHeaders().setContentType(MediaType.APPLICATION_JSON);
        return response.writeWith(Mono.fromSupplier(()->{
            DataBufferFactory dataBufferFactory=response.bufferFactory();
            byte[] bytes=null;
            try {
                bytes = objectMapper.writeValueAsBytes(result);
            } catch (JsonProcessingException e) {
                throw new RuntimeException(e);
            }
            return dataBufferFactory.wrap(bytes);
        }));

    }
}
