xcoobee-sdk/src/xcoobee/api/FileApi.js

The XcooBee SDK is a facility to abstract lower level calls and implement standard behaviors. The XcooBee team is providing this to improve the speed of implementation and show the best practices while interacting with XcooBee.

const Fs = require('fs');
const FormData = require('form-data');
const XcooBeeError = require('../core/XcooBeeError');
const ApiUtils = require('./ApiUtils');

/**
 * Uploads the specified file to the system.
 *
 * @param {File|string} file The path to the file to be uploaded or a `File`
 *   instance.
 * @param {Object} policy - The policy returned from `PolicyApi.upload_policy`.  It
 *   is used for S3 authentication.
 * @param {string} policy.credential
 * @param {string} policy.date
 * @param {string} policy.identifier
 * @param {string} policy.key
 * @param {string} policy.policy
 * @param {string} policy.signature
 * @param {string} policy.upload_url
 *
 * @returns {Promise<IncomingMessage>} - The HTTP response.
 *
 * @throws {XcooBeeError}
 */
const upload_file = (file, policy) => {
  const url = policy.upload_url;
  // See https://docs.aws.amazon.com/AmazonS3/latest/API/sigv4-authentication-HTTPPOST.html
  const formData = new FormData();
  formData.append('key', policy.key);
  formData.append('acl', 'private');
  formData.append('X-Amz-Algorithm', 'AWS4-HMAC-SHA256');
  formData.append('X-Amz-Credential', policy.credential);
  formData.append('X-Amz-Date', policy.date);
  formData.append('X-Amz-meta-identifier', policy.identifier);
  formData.append('Policy', policy.policy);
  formData.append('X-Amz-Signature', policy.signature);
  if (typeof File === 'function' && file instanceof File) {
    formData.append('file', file);
  } else {
    formData.append('file', Fs.createReadStream(file));
  }

  return new Promise((resolve) => {
    const callback = (err, res, statusCode) => {
      if (err) {
        throw ApiUtils.transformError(err);
      }
      if (statusCode >= 300) {
        throw new XcooBeeError(`Failed to upload file at: ${file} using policy: ${JSON.stringify(policy)}`);
      }

      resolve(res);
    };

    if (typeof formData.submit === 'function') {
      formData.submit(url, (err, res) => callback(err, res, res.statusCode));
    } else {
      const request = new XMLHttpRequest();
      request.onreadystatechange = () => {
        if (request.readyState === 4) {
          callback(null, request.responseText, request.status);
        }
      };
      request.open('POST', url);
      request.send(formData);
    }
  });
};

module.exports = {
  upload_file,
};