curationexperts / mahonia / 1044

98%

Pull #282

travis-ci

Add basic virus checking with logging and file deletion

Virus handling is added to `AttachFilesToWorkJob` (which unfortunately must be
copied wholesale from Hyrax).

By default Hyrax embeds virus checking in the model validations, which means a
real `Hydra::PCDM::File` must exist in order to check for a virus and handle
errors. This is somewhat challenging in the case that we want to check
asynchonously and handle errors, since a `File` doesn't exist until an
`ImportJob` is running; in the default actor stack, this is several asynchonous
jobs deep.

By adding an early check, we can avoid creating a `FileSet` for files that
contain a virus, and add error handling earlier in the stack. In this case, we
log to `Rails.logger.error`.

We also clean up the file from disk, which Hyrax does not seem to bother
with(?).

Closes #178.

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