Simple Steem Random Comment Picker

SteemRandomPicker is a simple random comment picker which utilizes the Fisher-Yates shuffle algorithm to pick a random Steem comment. Its intended use could be in the selection of contest winner. User can filter based on follow, resteem, and reputation of participants.

Repository

https://github.com/CodeBull/SteemRandomPicker

Web

https://picker.steemify.me/

How to Use

• Enter steem post's URL in the textbox. URL from any steem interface would work as long as it is in author/permalink format.
• Select appropriate filters for the contest. Follow and resteem is not required by default. If required select required to participate, if follow and resteem should count as another entry select count as +1 entry. If you want to filter based on reputation, enter your minimum required reputation score.
• Click get a random winner button.
• A randomly selected winner will appear below along with comment body and permalink to the comment.
• If there is any problem with the steem or hivemind node, a user can change nodes using the Settings modal.

How does it work

At the beginning when page loads it sets default steem and hivemind nodes. If a user has previously saved settings then it replaces those with the user settings.

// Setting up default nodes
let steemdNode = 'https://anyx.io';
let hiveNode = 'https://tower.hive.oracle-d.com/api/v1';

if (localStorage.getItem('steemd')) steemdNode = localStorage.getItem('steemd');
if (localStorage.getItem('hive')) hiveNode = localStorage.getItem('hive');

Upon submission of the form, it will try to extract author and permalink from the steem post URL and fetch first level comments from the blockchain.

const url = $('#url').val();
const follow = $('input[name="follow"]').val();
const resteem = $('input[name="resteem"]').val();
const rep = $('input[name="min_rep"]').val();

const { author, permlink } = getAuthorAndPermlink(url);
// Getting all comments for the content
const comments = await client.database.call('get_content_replies', [author, permlink]);

Then it loops through all the comments and picks only required bits from the comment objects. It also calculates the reputation of every comment authors.

let users = comments
    .map(c => ({
      author: c.author,
      permlink: c.permlink,
      body: c.body,
      rep: calcReputation(c.author_reputation),
    }))
    .filter(u => u.rep >= rep);

After that, it checks if resteem or follow filters is set to required or not. If not required it ignores else it queries Hivemind RPC to get resteem and follow data for main post and its author.

if (resteem !== 'ignore') {
    const resteemQuery = await window.axios.get(`${hiveNode}/post_cache/${author}/${permlink}/reblogs/`);

    const resteems = resteemQuery.body.map(r => r.author);

    const resteemers = users.filter(u => resteems.includes(u.author));

    if (resteem === 'count') users.push(...resteemers);
    if (resteem === 'required') users = resteemers;
}

if (follow !== 'ignore') {
    const followersQuery = await window.axios.get(`${hiveNode}/accounts/${author}/followers/`);

    const followers = users.filter(u => followersQuery.body.followers.includes(u.author));

    if (follow === 'count') users.push(...followers);
    if (follow === 'required') users = followers;
  }

If follow and/or resteem is set to count as another entry, it pushes every qualified participant in the array which makes them appear twice and increase chances of their winning.

After preparing the array with all qualified participants, it shuffles the array and selects the first element of the array as the winner.

// Suffling filtered participants and selecting one
const winner = shuffleArray(users)[0];

Then it populates the HTML template, hides loading screen and shows the winner to the user.

let winnerText = resultText;

winnerText = winnerText.replace(/\{USERNAME\}/g, winner.author);
winnerText = winnerText.replace(/\{REP\}/g, winner.rep);
winnerText = winnerText.replace(/\{BODY\}/g, winner.body);
winnerText = winnerText.replace(/\{PERMLINK\}/g, winner.permlink);

$('#loading').hide();

$('.winner').show().html(winnerText);

Technology

• jQuery
• dSteem
• Hivemind RPC by @emrebeyler

Contributing

Feel free to fork the repository and make changes. If you find any issues please create a GitHub issue or let me know in the comments below.

GitHub

https://github.com/CodeBull/