Node.js 開發Slack Bot - 2

       Node.js開發Slack Bot - 1已經有一個連接到Slack的Chat Bot, 現在實作當Bot上線後會發送"Hello"給有邀請Bot的全部頻道。

在原本的index.js新增getAllChannels() function

function getAllChannels()
{
   return web.channels.list().then((resp)=>{
      return resp;
   }).catch((error) => {console.log(error);});
}

在connected event呼叫getAllChannels和判斷Bot在哪一個頻道。

slack.on('connected', () => {

  let user= {"user":slack.activeUserId};

  (async() =>{
             
    let userInfo = await getUserInfo(user);
    let teamInfo = await getTeamInfo();
    let allChannels = await getAllChannels();
    let channels = [];
    for (let id in allChannels.channels) {
          let channel = allChannels.channels[id];
          if(channel.is_member)
            channels.push(channel);
    }  

    let channelNames = channels.map((channel) => {
                          return channel.name;
                        }).join(', ');         

    console.log(`Connected to ${teamInfo.team.name} as ${userInfo.user.name}`);
    console.log(`Currently in: ${channelNames}`);
  })();

});

切換Terminal會看到以下類似的輸出，這時候已經知道Bot在哪一個頻道，開始發送"Hello"給這些頻道的所有人。

Connected to Deikhoong as helloBot
Currently in : bot-test

獲取頻道中的全部人
我們已經有了channels這個物件，那需要得到頻道中的人就變得非常簡單。

channels.forEach((channel) => {
     console.log('Members of this channel: ', channel.members);
});

結果如下,
Connected to Deikhoong as hellobot
Currently in: bot-test
Members of this channel:  [ 'U1GUZL79C', 'UBGN5T9K2' ]

發現channels.members回傳的不是member的物件而是member id, 這會讓我們很難辨識.我們在改寫這段程式碼使用直接的getUserInfo()獲得 user的名稱。

let members=[];
channels.forEach(async (channel) => {
     for (let id in channel.members) {
        let memberId = channel.members[id];      
        user= {"user":memberId};
        let member= await getUserInfo(user);
        members.push(member);
     }
     let memberNames = members.map((member) => {
              return member.user.name;
      }).join(', ');
     console.log('Members of this channel: ', memberNames);
});

已經可以看到user的名稱
Connected to Deikhoong as hellobot
Currently in: bot-test
Members of this channel: tan.deik.hoong, hellobot

發送訊息到頻道
透過RTMClient.sendMessage發送訊息給頻道。

slack.on('connected', () => {

  let user= {"user":slack.activeUserId};

  (async() =>{
             
    let userInfo = await getUserInfo(user);
    let teamInfo = await getTeamInfo();
    let allChannels = await getAllChannels();
    let channels = [];
    for (let id in allChannels.channels) {
          let channel = allChannels.channels[id];
          if(channel.is_member)
            channels.push(channel);
    }  

    let channelNames = channels.map((channel) => {
                          return channel.name;
                        }).join(', '); 


    console.log(`Connected to ${teamInfo.team.name} as ${userInfo.user.name}`);
    console.log(`Currently in: ${channelNames}`);

    let members=[];
    channels.forEach(async (channel) => {
         for (let id in channel.members) {
            let memberId = channel.members[id];      
            user= {"user":memberId};
            let member= await getUserInfo(user);
            members.push(member);
         }
         let memberNames = members.map((member) => {
              return member.user.name;
          }).join(', ');
        console.log('Members of this channel: ', memberNames);
        //send message to channel
        slack.sendMessage(`Hello ${memberNames}!`, channel.id);
    });

  })();

});

Bot每次上線的時候都會發送訊息給全部頻道的人。