import { Context, Next } from 'koa';
import config from '@config';
export default () => {
  return async (ctx: Context, next: Next) => {
    const host: string = ctx.host
    const isMatch = config.checkHost.find(el => host.match(el))
    if (!isMatch) {
      // 域名不对
      ctx.throw(403, '请求出错')
    }
    const ip: string = ctx.ip;
    const key: string = `client_ip_limit_${ip}`;
    const limit: number = Number(await ctx.$redis.get(key)) || 0;
    if (limit > config.limit.times) {
      ctx.throw(403, '请求频次过高');
    };
    ctx.$redis.setex(key, config.limit.time, String(limit + 1));
    await next();
  };
};