feat: add probation and ban enforcement

packages/tracker/meshnet_tracker/server.py

@@ -83,6 +83,14 @@ def _select_route(
     return route, ""
 
 
+def _registration_ban_error(contracts: Any | None, wallet_address: str | None) -> str | None:
+    if contracts is None or not wallet_address:
+        return None
+    if contracts.registry.get_wallet(wallet_address).banned:
+        return "wallet is banned"
+    return None
+
+
 class _TrackerHTTPServer(http.server.HTTPServer):
     def __init__(
         self,
@@ -205,6 +213,10 @@ class _TrackerHandler(http.server.BaseHTTPRequestHandler):
         if wallet_address is not None and not isinstance(wallet_address, str):
             self._send_json(400, {"error": "wallet_address must be a string"})
             return
+        ban_error = _registration_ban_error(server.contracts, wallet_address)
+        if ban_error:
+            self._send_json(403, {"error": ban_error})
+            return
 
         node_id = str(uuid.uuid4())
         entry = _NodeEntry(