Nightwatch — Upload local files to remote selenium grid

uploadLocalFile.js

const path = require('path');
const util = require('util');
const events = require('events');
const archiver = require('archiver');

function uploadLocalFile() {
  events.EventEmitter.call(this);
}
util.inherits(uploadLocalFile, events.EventEmitter);
/**
 * uploadLocalFile is responsible for using webdriver protocol to upload a local
 * file to a remote Selenium server for use in testing uploads.
 *
 * @argument filePath Local path to the file used for uploading
 * @argument inputSelector Input selector for the file input to upload with
 */
uploadLocalFile.prototype.command = function uploadToSelenium(
  filePath,
  inputSelector
) {
  const self = this;
  const Nightwatch = this.client;
  const api = this.api;

  const uploadRemote = () => {
    const buffers = [];
    const zip = archiver('zip');
    zip
      .on('data', data => {
        buffers.push(data);
      })
      .on('error', err => {
        throw err;
      })
      .on('finish', () => {
        const file = Buffer.concat(buffers).toString('base64');
        api.session(session => {
          const opt = {
            path: `/session/${session.sessionId}/file`,
            method: 'POST',
            data: { file }
          };

          Nightwatch.transport.runProtocolAction(opt).then(result => {
            if (result.status !== 0) throw new Error(result.value);
            api.setValue(inputSelector, result.value, () =>
              self.emit('complete')
            );
          });
        });
      });

    const name = path.basename(filePath);
    zip.file(filePath, { name });
    zip.finalize();
  };

  uploadRemote();

  return self;
};

module.exports = uploadLocalFile;