Save virus scan status to blob metadata

app/lib/active_storage/virus_scanner.rb

@@ -0,0 +1,46 @@
+class ActiveStorage::VirusScanner
+  include ActiveStorage::Downloading
+
+  def initialize(blob)
+    @blob = blob
+  end
+
+  attr_reader :blob
+
+  PENDING = 'pending'
+  INFECTED = 'infected'
+  SAFE = 'safe'
+
+  def pending?
+    blob.metadata[:virus_scan_result] == PENDING
+  end
+
+  def infected?
+    blob.metadata[:virus_scan_result] == INFECTED
+  end
+
+  def safe?
+    blob.metadata[:virus_scan_result] == SAFE
+  end
+
+  def analyzed?
+    blob.metadata[:virus_scan_result].present?
+  end
+
+  def analyze_later
+    if !analyzed?
+      blob.update!(metadata: blob.metadata.merge(virus_scan_result: PENDING))
+      VirusScannerJob.perform_later(blob)
+    end
+  end
+
+  def metadata
+    download_blob_to_tempfile do |file|
+      if ClamavService.safe_file?(file.path)
+        { virus_scan_result: SAFE, scanned_at: Time.zone.now }
+      else
+        { virus_scan_result: INFECTED, scanned_at: Time.zone.now }
+      end
+    end
+  end
+end