Ruby on Rails

Hi folks,
  I am building secure web application using Ruby on Rails which scans virus in uploaded file.
Now Currently I can access the tempfile from the ActionDispatch::Http::UploadedFile instance which Rails creates for uploaded file and complete scan successfully.
But I want to avoid Rails creating the tempfile as I fear once the virus affected file stored in tempfile this may infect the system.

What my question is:

  Is there any way to tell Rails that 'Generate the IO stream instance(string) instead of Tempfile' ?

If Rails gives file as IO stream I can use this stream to scan for Virus.

If something asked fundamentally wrong give me your suggestion.

Thanks
Soundar

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