async function store()

in exercises/node-javascript/encryption-context-start/store.js [36:62]

• 19 lines of code
• 3 McCabe index (conditional complexity)

async function store(fileStream, encryptionContext = {}) {
  /* The encryption context can not step on the Dynamo DB indexing structure. */
  needs(
    !encryptionContext[partition_key] && !encryptionContext[sort_key],
    `Can't use DB key names ${partition_key} or ${sort_key} as Encryption Context keys!`
  );

  const Key = uuid.v4();

  const PointerItem = ddbItem(Key, object_target, encryptionContext);
  const ContextItems = Object.keys(encryptionContext)
    .map(canonicalContextKey)
    .map(canonicalKey => ddbItem(canonicalKey, Key));

  // ENCRYPTION-CONTEXT-START: Set Encryption Context on Encrypt
  const Body = fileStream.pipe(encryptStream(encryptKeyring));

  const file = await s3
    .upload({ Bucket, Key, Body, Metadata: encryptionContext })
    .promise();

  for (Item of [PointerItem, ...ContextItems]) {
    await ddb.put({ Item, TableName }).promise();
  }

  return file;
}