leaderboard.js

const fs = require("fs");
const fetch = require('node-fetch');
const readlines = require('readline')
const cookie = fs.readFileSync('myCookie.txt');
let leaderboardId = '';

const getLeaderboard = () => {
    const readline = readlines.createInterface(process.stdin, process.stdout);
    
    readline.setPrompt("Input leaderboard id. Wont sanitize so just numbers\n")
    readline.prompt()
    return new Promise(resolve => {
        readline.on('line', id => {
            leaderboardId = id.trim();
            readline.close();
        })

        readline.on('close', () => {
            resolve();
        })
    });
}

const getData = async (cookie) => {
    const leaderboardUrl = `https://adventofcode.com/2020/leaderboard/private/view/${leaderboardId}.json`

    const response = await fetch(leaderboardUrl,
        {
            headers: {
                Cookie: cookie
            }
        });
    return await response.json();
}

const formattedTime = (date) => {
    const hours = date.getHours() < 10 ? "0" + date.getHours() : date.getHours();
    const minutes = "0" + date.getMinutes();
    const seconds = "0" + date.getSeconds();
    return hours + ":" + minutes.substr(-2) + ":" + seconds.substr(-2);
};

const mapData = (starIdx, star, name, challengeDay) => {
    const date = new Date(+star.get_star_ts * 1000);
    const dateOffset = date.getDate() - challengeDay;
    const offsetString = dateOffset > 0 ? `+${dateOffset}` : "  ";
    const time = formattedTime(date) + offsetString;
    const ts = +star.get_star_ts;
    return {ts, time, starIdx, name};
};

const main = async () => {
    await getLeaderboard();
    input = await getData(cookie)

    const formatEntry = ({time, starIdx, name}, position) =>
        `${time} | ${starIdx} | ${position} | ${name}`;

    let output = `# Leaderboard ${input.owner_id}  \n`;
    for (let day = 0; day < 26; day++) {
        const positions = {
            1: 1,
            2: 1,
        };

        /* Credit to https://github.com/lindskogen/ for "magic script" */
        const entries = Object.values(input.members)
            .filter((member) => member.completion_day_level[day] != null)
            .flatMap((member) =>
                Object.entries(member.completion_day_level[day]).map(([starIdx, star]) =>
                    mapData(starIdx, star, member.name, day)
                )
            )
            .sort((left, right) => left.ts - right.ts)
            .map((data) => {
                const position = ("   " + positions[data.starIdx]).slice(-3);
                positions[data.starIdx] += 1;
                return formatEntry(data, position);
            })
            .join("\n");

        if (entries) {
            output += `*Day ${day}*\n      Time | ★ | Pos | Name\n`;
            output += entries;
            output += `  \n\n`;
        }
    }
    if (!fs.existsSync("./leaderboards")) {
        fs.mkdirSync("./leaderboards")
    }
    fs.writeFileSync(`./leaderboards/Leaderboard ${input.owner_id}.md`, output);
    console.log(`Done! Printed to file: Leaderboard ${input.owner_id}.md`);
    process.exit(0);
}

main();