store-local-file.js

store-local-file.js

'use strict';

const request = require('request');
const fs = require('fs');

// fetch binary from `url` and upload to local file using `dest` as destination
const store = (url, dest) => {
  return new Promise((resolve, reject) => {
    request({
      method: 'GET',
      url: url,
      encoding: null // returns body as Buffer
    }).on('error', (e) => {
      // something went wrong during fetch avatar.
      return reject(e);
    }).on('response', (res) => {
      if (res.statusCode.toString().slice(0, 1) !== '2') { // server respond with unexpected status code
        return reject(new Error(`Unexpected status code ${res.statusCode}`));
      }

      res.pipe(fs.createWriteStream(dest))
      .on('error', (e) => {
        // something went wrong on writable stream
        reject(e);
      }).on('finish', () => {
        // all data has been flushed
        resolve(dest);
      });
    });
  });
};


module.exports = exports = store;