Koa路由中写一个钩子函数，用于萤石云消息触发钉钉机器人webhook

//钉钉机器人的地址
let webhook = 'https://oapi.dingtalk.com/robot/send?access_token=4dd5cd7xxxxxxxxxxxxxxxxxxxxxxxxxxx'
let whiteList = ['xxxx'] //摄像头序列号白名单，只有在白名单里的才促发报警消息，用于过滤
//获取webhook消息并转发到钉钉机器人
async function sendToDingtalk  (ctx,next) {
    await next()
    ctx.request.body = JSON.parse(ctx.request.body)
    console.log('debugger',ctx.request.body.header)
    console.log('debugger',ctx.request.body)
    let {deviceId, messageTime, channelNo, type, messageId} = ctx.request.body.header
    let {channelName, alarmTime, pictureList } = ctx.request.body.body
    console.log('萤石云消息ID:',messageId)
    let data = null
    if(type=='ys.alarm' &&  whiteList.includes(deviceId) ){
        data =  {
        "msgtype": "markdown",
        "markdown": {
            "title": `【告警消息】${channelName}`, 
            "text": `### 设备名称：${channelName} \n #### 设备序列号：${deviceId} \n #### 通道：${channelNo} \n #### 消息类型：${type} \n #### 时间：${alarmTime} \n ![](${pictureList[0].url})`
            }
        }
    }else if(type=='ys.onoffline'){
        data =  {
        "msgtype": "markdown",
        "markdown": {
            "title": `【上下线消息】${channelName}`, 
            "text": `### 设备名称：${channelName} \n #### 设备序列号：${deviceId} \n #### 通道：${channelNo} \n #### 消息类型：${type} \n #### 时间：${alarmTime}`
            }
        }
    }
    // 判断消息类型，然后发送到钉钉webhook
    if(data != null){
        axios.post(webhook,
           data
        ).then(res=>{
            console.log('钉钉调用成功')
            console.log(res.data)
        }).catch(err=>{
            console.error(err)
        })
    }
    
    ctx.body={
        messageId
    }
}