Webtask.io Github Contribution Data API-ification! 🤘

github-contributions-webtask.js

"use latest";

/*
 * A webtask.io little hack to scrape the github contributions data, and present it in some usable JSON
 *
 * Setup:
 *  - Download this file
 *  - Setup a webtask.io account
 *  - Upload to webtask.io with something like:
 *     wt create --name github-contributions github-contributions-webtask.js
 *  - Make note of the endpoint webtask.io provides for you
 *
 * Usage (replace the given url with your own)
 *   curl https://webtask.it.auth0.com/api/run/wt-j-jasonstrutz_com-0/github-contributions?username=jstrutz
 *
 * the `username` querystring argument is a GitHub username, and is required
 *
 */
var fetch = require('isomorphic-fetch');
var htmlparser = require('htmlparser2');

function githubContributions(username) {
  let url = 'https://github.com/users/'+username+'/contributions';

  return fetch(url)
    .then( res => res.text())
    .then( body => {
      let contributionsByDay = {},
          parser = new htmlparser.Parser({
        onopentag: (name, attribs) => {
          if(name === "rect" && attribs['class'] === "day"){
            let count = parseInt(attribs['data-count']),
                date  = attribs['data-date'];

            contributionsByDay[date] = count;
          }
        },
      }, {decodeEntities: true});
      parser.write(body);
      parser.end();

      // Calculate streaks and totals from days
      return Object.keys(contributionsByDay).sort().reduce( (agg, day) => {
        let count = contributionsByDay[day];
        agg.total += count;
        if (count > 0) {
          agg.currentStreak += 1;
        }
        else {
          if (agg.longestStreak < agg.currentStreak) agg.longestStreak = agg.currentStreak;
          agg.currentStreak = 0;
        }
        return agg;
      }, {
        username: username,
        total: 0,
        currentStreak: 0,
        longestStreak: 0,
        days: contributionsByDay
      });
    });
}

module.exports = function(ctx, cb) {
  var username = ctx.data.username;

  if (username) {
    githubContributions(ctx.data.username)
      .then( results => cb(null, results), err => cb(err) );
  }
  else {
    cb(Error("You must provide a `username` argument"));
  }
}