Phase 1: scaffold local backend — models, schemas, routers, printer service, Docker

local_backend/middleware/license_check.py

@@ -0,0 +1,35 @@
+from fastapi import Request, Response
+from starlette.middleware.base import BaseHTTPMiddleware
+
+# Shared mutable state — updated by cloud_sync.py
+license_state: dict = {
+    "licensed": True,
+    "locked": False,
+    "expires_at": None,
+    "last_sync": None,
+    "sync_failed": False,
+}
+
+EXEMPT_PATHS = {"/api/system/health"}
+
+
+class LicenseCheckMiddleware(BaseHTTPMiddleware):
+    async def dispatch(self, request: Request, call_next):
+        if request.url.path in EXEMPT_PATHS:
+            return await call_next(request)
+
+        if license_state.get("locked"):
+            return Response(
+                content='{"detail": "System is locked by cloud administrator"}',
+                status_code=423,
+                media_type="application/json",
+            )
+
+        if not license_state.get("licensed", True):
+            return Response(
+                content='{"detail": "License expired or invalid"}',
+                status_code=402,
+                media_type="application/json",
+            )
+
+        return await call_next(request)