code: public String retrieveData(String token) {
          try {
              RetrievedContent data = this.s3StorageProvider.getContent(this.hiddenSpaceName, token);
              return IOUtil.readStringFromStream(data.getContentStream());
          } catch (NotFoundException ex) {
              return null;
          } catch (Exception ex) {
              throw new DuraCloudRuntimeException(ex);
          }
      }
docs: Retrieves string data given its token.
  
  If no data is associated with the provided token, returns null
  
  @param token
  @return