githubClient.js

const https = require("https");

const makeRequest = path =>
  new Promise((resolve, reject) => {
    let req = {
      hostname: "api.github.com",
      port: 443,
      path,
      method: "GET",
      headers: {
        Accept: "application/vnd.github.antiope-preview+json",
        "User-Agent": "node"
      }
    };

    if (process.env.GITHUB_TOKEN) {
      req.headers.Authorization = `token ${process.env.GITHUB_TOKEN}`;
    }

    https.get(req, resp => {
      let data = "";

      resp.on("data", chunk => {
        data += chunk;
      });
      resp.on("error", error => reject(error));
      resp.on("end", () => {
        const parsed = JSON.parse(data);

        if (resp.statusCode === 200) {
          resolve(parsed);
        } else {
          reject(parsed);
        }
      });
    });
  });

const findCheckSuite = parsed => {
  const matched = parsed.check_suites.find(
    checkSuite => checkSuite.app.name === "GitHub Actions"
  );

  if (!matched) {
    throw new Error("Could not find check suite named GitHub Actions");
  }

  return matched;
};

const getCheckSuite = (owner, repo, branch) =>
  makeRequest(
    `/repos/${owner}/${repo}/commits/${branch || "master"}/check-suites`
  ).then(findCheckSuite);

const getLatestRunURL = (owner, repo, branch) =>
  getCheckSuite(owner, repo, branch)
    .then(checkSuite => makeRequest(checkSuite.check_runs_url))
    .then(response => ({
      url: response.check_runs[0].html_url,
      etag: response.check_runs[0].head_sha
    }));

module.exports = {
  getCheckSuite,
  getLatestRunURL
};