blobstore.py 文件源码

def _get_upload_content(field_storage):
  """Returns an email.Message holding the values of the file transfer.

  It decodes the content of the field storage and creates a new email.Message.

  Args:
    field_storage: cgi.FieldStorage that represents uploaded blob.

  Returns:
    An email.message.Message holding the upload information.
  """
  message = email.message.Message()
  message.add_header(
      'content-transfer-encoding',
      field_storage.headers.getheader('Content-Transfer-Encoding', ''))
  message.set_payload(field_storage.file.read())
  payload = message.get_payload(decode=True)
  return email.message_from_string(payload)