A simple Twitter bot that post NYC COVID vaccine availability

app.js

const fetch = require('node-fetch');
const Twit = require('twit');

let lastNotifiedLocations = [];

const T = new Twit({
  consumer_key: process.env.TWITTER_CONSUMER_KEY,
  consumer_secret: process.env.TWITTER_CONSUMER_SECRET,
  access_token: process.env.TWITTER_ACCESS_TOKEN,
  access_token_secret: process.env.TWITTER_ACCESS_TOKEN_SECRET,
});

async function getAppointments() {
  const response = await fetch("https://services1.arcgis.com/oOUgp466Coyjcu6V/arcgis/rest/services/VaccineFinder_Production_View/FeatureServer/0/query?f=json&cacheHint=true&orderByFields&outFields=*&outSR=4326&spatialRel=esriSpatialRelIntersects&where=1%3D1");
  const { features } = await response.json();

  const appoints = features
    .filter(x => x.attributes.AppointmentAvailability === 'Available');
  const filtered = appoints
    .filter(x => lastNotifiedLocations.indexOf(x.attributes.OBJECTID) === -1);

  lastNotifiedLocations = appoints.map(x => x.attributes.OBJECTID);

  return filtered;
}

async function postToTwitter(appointments) {
  for (let { attributes } of appointments) {
    const { FacilityName, Address, Address2, Borough, Zipcode, Website, ServiceType_Pfizer, ServiceType_Moderna, ServiceType_JohnsonAndJohnson } = attributes;
    const brand = ServiceType_Moderna === "Yes" ? 'Moderna' : (ServiceType_Pfizer === "Yes" ? 'Pfizer' : (ServiceType_JohnsonAndJohnson === "Yes" ? 'J&J' : null));

    await T.post('statuses/update', {
      status: `Vaccine appointments are available at\n\n${FacilityName}${brand ? ` (${brand})` : ''}\n${Address}${Address2?.length > 0 ? `, ${Address2}` : ''}, ${Borough}, NY, ${Zipcode}\n\n${Website}`,
    });
  }
}

async function run() {
  const appointments = await getAppointments();
  console.log('[INFO]', `Found appointments at ${appointments.length} locations.`);

  if (appointments.length === 0) return;

  await postToTwitter(appointments);
}

try {
  (async () => {
    console.log('💉 vaccine-bot is running!');

    setInterval(async () => {
      await run();
    }, 300000);
    await run();
  })();
} catch (error) {
  console.log(error);
}

docker-compose.yml

version: "3"

services:
  vaccine-bot:
    build:
      context: .
      dockerfile: Dockerfile
    environment:
      - TWITTER_CONSUMER_KEY=
      - TWITTER_CONSUMER_SECRET=
      - TWITTER_ACCESS_TOKEN=
      - TWITTER_ACCESS_TOKEN_SECRET=

Dockerfile

FROM node:14

WORKDIR /usr/src/app

COPY package*.json ./

ENV NODE_ENV production
RUN npm ci --only=production

COPY . .

EXPOSE 3000
CMD [ "node", "app.js" ]