Added lnurl helper, and I hate mypy

helpers.py

@@ -0,0 +1,17 @@
+# Description: A place for helper functions.
+
+from fastapi import Request
+from lnurl.core import encode as lnurl_encode
+
+# The lnurler function is used to generate the lnurlpay and lnurlwithdraw links
+# from the lnurl api endpoints in views_lnurl.py.
+# It needs the Request object to know the url of the LNbits.
+# Lnurler is used in views_api.py
+
+
+def lnurler(myex_id: str, route_name: str, req: Request) -> str:
+    url = req.url_for(route_name, myextension_id=myex_id)
+    url_str = str(url)
+    if url.netloc.endswith(".onion"):
+        url_str = url_str.replace("https://", "http://")
+    return str(lnurl_encode(url_str))