CircleCI coverage lambda

lambda.js

const Promise = require('bluebird');
const request = require('request');
const requestAsync = Promise.promisify(request);
const USER = process.env.GITHUB_USER;

exports.handler = async (event, context) => {
  try {
    if (!USER) throw new Error('GITHUB_USER env missing');

    const module = event.pathParameters.module;
    const builds = await requestAsync({
      url: `https://circleci.com/api/v1.1/project/github/${USER}/${module}/tree/master?shallow=true&offset=0&limit=30&mine=false`,
      gzip: true,
      json: true
    });

    const lastBuild = builds.body.find(d => d.status === 'success');
    if (!lastBuild) return context.succeed({
      statusCode: 500,
      body: 'No last build found'
    });

    const artifacts = await requestAsync({
      url: `https://circleci.com/api/v1.1/project/github/${USER}/${module}/${lastBuild.build_num}/artifacts`,
      gzip: true,
      json: true
    });

    const coverage = artifacts.body.find( d => /coverage\/index\.html$/.test(d.path) || d.path.includes('lcov-report/index.html'));
    if (/url$/.test(event.path)) return context.succeed({
      statusCode: 307,
      headers: {
          location: coverage.url
      }
    });
       
    const report = await requestAsync({
      url: coverage.url,
      gzip: true
    });

    
    let percent = (/"strong">(.*?)%/.exec(report.body) || [])[1] || 0;
    percent = Math.round(percent)+'%';
    const svg = `<svg xmlns="http://www.w3.org/2000/svg" width="99" height="20"><linearGradient id="a" x2="0" y2="100%"><stop offset="0" stop-color="#bbb" stop-opacity=".1"/><stop offset="1" stop-opacity=".1"/></linearGradient><rect rx="3" width="99" height="20" fill="#555"/><rect rx="3" x="63" width="36" height="20" fill="#97CA00"/><path fill="#97CA00" d="M63 0h4v20h-4z"/><rect rx="3" width="99" height="20" fill="url(#a)"/><g fill="#fff" text-anchor="middle" font-family="DejaVu Sans,Verdana,Geneva,sans-serif" font-size="11"><text x="32.5" y="15" fill="#010101" fill-opacity=".3">coverage</text><text x="32.5" y="14">coverage</text><text x="80" y="15" fill="#010101" fill-opacity=".3">${percent}</text><text x="80" y="14">${percent}</text></g></svg>`;

    context.succeed({
      statusCode:200,
      headers:{
          'content-type':'image/svg+xml'
      },
      body:svg
    });
  } catch(e) {
    context.succeed({
      statusCode: 500,
      error: e.message,
      stack: e.stack
    });
  }
};

if (!module.parent) {
  exports.handler({
    path: '.../url',
    pathParameters: {
      module: 'node-unzipper'
    }
  },{
      succeed: console.log, 
  });
}