Refactoring

[ndokter]

• Moved the decryption logic to own method to make parse a bit more readable
• Simplified it a bit by removing the double if layer which seems unneeded
• If encryption is not working, log a warning once and then stop logging warnings
  • Maybe we should enforce encryption if you are setting a key for it. But i'm not 100% sure if that has side effects
• Moved client tests to their own folder