fix: lnurl_encoding error was not handled (#56)

helpers.py

@@ -0,0 +1,28 @@
+from fastapi import Request
+from lnurl import Lnurl
+from lnurl import encode as lnurl_encode
+from shortuuid import uuid
+
+from .models import WithdrawLink
+
+
+def create_lnurl(link: WithdrawLink, req: Request) -> Lnurl:
+    if link.is_unique:
+        usescssv = link.usescsv.split(",")
+        tohash = link.id + link.unique_hash + usescssv[link.number]
+        multihash = uuid(name=tohash)
+        url = req.url_for(
+            "withdraw.api_lnurl_multi_response",
+            unique_hash=link.unique_hash,
+            id_unique_hash=multihash,
+        )
+    else:
+        url = req.url_for("withdraw.api_lnurl_response", unique_hash=link.unique_hash)
+
+    try:
+        return lnurl_encode(str(url))
+    except Exception as e:
+        raise ValueError(
+            f"Error creating LNURL with url: `{url!s}`, "
+            "check your webserver proxy configuration."
+        ) from e