Watch followers count of specific Bilibili user

watch_followers.js

/**
 * This script is used to watch followers count of specific user in Bilibili.
 * Please change the constant "CHECK_UID" to user id you want to watch.
 * 
 * Before running this script, please install following dependencies to global:
 * - axios
 * - node-notifier
 * 
 * For example, when you are using NPM as package manager,
 * run this command in shell:
 * > npm install -g axios node-notifier
 * 
 * @author Siubeng <[email protected]>
 */
const { execSync } = require('child_process');
const path = require('path');
const root = execSync('npm root -g').toString().trim();
const requireg = (name) => require(path.resolve(root, name));

const axios = requireg('axios');
const notifier = requireg('node-notifier');
const INFO_URL = 'https://api.bilibili.com/x/space/acc/info';
const RELATION_URL = 'https://api.bilibili.com/x/relation/stat';

// Change specific user id here
const CHECK_UID = '375504219';
// Check interval. Default: 60s
const CHECK_INTERVAL = 1000 * 60;
// Enable system notification
const NOTIFY_ENABLED = true;

let maxCount = 0;
let username = '';

function normalize(num) {
    return num < 10 ? '0' + num : num;
}

async function check() {
    const req = await axios(RELATION_URL, {params: {vmid: CHECK_UID}});
    const date = new Date(Date.now());
    const count = req.data.data.follower;
    const hh = normalize(date.getHours());
    const mm = normalize(date.getMinutes());
    const ss = normalize(date.getSeconds());
    console.log(`[${hh}:${mm}:${ss}] ${username} 粉丝数量：${count}`);
    if (count > maxCount) {
        maxCount = count;
        if (NOTIFY_ENABLED) {
            notifier.notify({
                title: username + ' 粉丝数量',
                message: '当前粉丝数量：' + count,
            });
        }
    }
}

// Main procedure
async function main() {
    const req = await axios(INFO_URL, {params: {mid: CHECK_UID}});
    username = req.data.data.name;
    setInterval(check, CHECK_INTERVAL);
    check();
}

main();