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Take a signed permanent reference for a blob and turn it into an expiring service URL for download. Note: These URLs are publicly accessible. If you need to enforce access protection beyond the security-through-obscurity factor of the signed blob references, you'll need to implement your own authenticated redirection controller.

Methods
S
Instance Public methods
show()
# File activestorage/app/controllers/active_storage/blobs_controller.rb, line 7
def show
  if blob = ActiveStorage::Blob.find_signed(params[:signed_id])
    expires_in ActiveStorage::Blob.service.url_expires_in
    redirect_to blob.service_url(disposition: params[:disposition])
  else
    head :not_found
  end
end