Refactor command handling

This now supports usage/help texts

packages/sshecret-sshd/src/sshecret_sshd/commands/get_secret.py

@@ -12,9 +12,15 @@ LOG = logging.getLogger(__name__)
 
 @final
 class GetSecret(CommandDispatcher):
-    """Get Secret."""
+    """Retrieve an encrypted secret.
+
+    Returns the value of the secret provided as a mandatory argument.
+    The secret will be encrypted using the stored RSA public key, and returned
+    as a base64 encoded string.
+    """
 
     name = "get_secret"
+    mandatory_argument = "SECRET"
 
     @override
     async def exec(self) -> None:
@@ -22,6 +28,7 @@ class GetSecret(CommandDispatcher):
         if len(self.arguments) != 1:
             raise exceptions.UnknownClientOrSecretError()
         secret_name = self.arguments[0]
+        LOG.debug("get_secret called: Argument: %r", secret_name)
         if secret_name not in self.client.secrets:
             await self.audit(
                 Operation.DENY,