[CHORE] flake8 issues E402, E721 and F821 (#1874)

* F821: undefine name
disabled and logged webhook_listener for opennode and lnpay because they are obviously not working
* E402: module level import not at top of file
* E721 fixes, only popped up for python3.9 not 3.10

lnbits/wallets/opennode.py

@@ -1,10 +1,7 @@
 import asyncio
-import hmac
-from http import HTTPStatus
 from typing import AsyncGenerator, Optional
 
 import httpx
-from fastapi import HTTPException
 from loguru import logger
 
 from lnbits.settings import settings
@@ -136,18 +133,20 @@ class OpenNodeWallet(Wallet):
             yield value
 
     async def webhook_listener(self):
+        logger.error("webhook listener for opennode is disabled.")
+        return
         # TODO: request.form is undefined, was it something with Flask or quart?
         # probably issue introduced when refactoring?
-        data = await request.form  # type: ignore
-        if "status" not in data or data["status"] != "paid":
-            raise HTTPException(status_code=HTTPStatus.NO_CONTENT)
+        # data = await request.form  # type: ignore
+        # if "status" not in data or data["status"] != "paid":
+        #     raise HTTPException(status_code=HTTPStatus.NO_CONTENT)
 
-        charge_id = data["id"]
-        x = hmac.new(self.auth["Authorization"].encode("ascii"), digestmod="sha256")
-        x.update(charge_id.encode("ascii"))
-        if x.hexdigest() != data["hashed_order"]:
-            logger.error("invalid webhook, not from opennode")
-            raise HTTPException(status_code=HTTPStatus.NO_CONTENT)
+        # charge_id = data["id"]
+        # x = hmac.new(self.auth["Authorization"].encode("ascii"), digestmod="sha256")
+        # x.update(charge_id.encode("ascii"))
+        # if x.hexdigest() != data["hashed_order"]:
+        #     logger.error("invalid webhook, not from opennode")
+        #     raise HTTPException(status_code=HTTPStatus.NO_CONTENT)
 
-        await self.queue.put(charge_id)
-        raise HTTPException(status_code=HTTPStatus.NO_CONTENT)
+        # await self.queue.put(charge_id)
+        # raise HTTPException(status_code=HTTPStatus.NO_CONTENT)