backend-cookbook-2-server.js

server.js

const express = require("express");
const bodyParser = require("body-parser");
const axios = require("axios");
const { WebClient } = require("@slack/web-api");
const getWeather = require("./getWeather");

const slackWebClient = new WebClient(process.env.SLACK_BOT_API_TOKEN);
const app = express();

app.use(bodyParser.json());
app.post("/", async function(request, response) {
  try {
    const {
      event: { type, subtype, text, channel }
    } = request.body;
    if (
      text &&
      text.includes(`<@${process.env.SLACK_BOT_ID}`) &&
      request.headers["x-slack-retry-num"] === undefined
    ) {
      await slackWebClient.chat.postMessage({
        channel,
        parse: "full",
        attachments: [
          {
            fallback: "6-06",
            image_url: `https://www.cwb.gov.tw/Data/fcst_img/QPF_ChFcstPrecip_6_06.png?ts=${new Date().getTime()}`
          },
          {
            fallback: "6-12",
            image_url: `https://www.cwb.gov.tw/Data/fcst_img/QPF_ChFcstPrecip_6_12.png?ts=${new Date().getTime()}`
          },
          {
            fallback: "6-18",
            image_url: `https://www.cwb.gov.tw/Data/fcst_img/QPF_ChFcstPrecip_6_18.png?ts=${new Date().getTime()}`
          },
          {
            fallback: "6-24",
            image_url: `https://www.cwb.gov.tw/Data/fcst_img/QPF_ChFcstPrecip_6_24.png?ts=${new Date().getTime()}`
          }
        ]
      });
    }
  } catch (err) {
    console.log(err);
  } finally {
    response.send(request.body.challenge);
  }
});

const listener = app.listen(process.env.PORT);