fix insertion bugs/incompatibilities with lastrowid stuff.

lnbits/lnurl.py

@@ -1,7 +1,16 @@
-from bech32 import bech32_decode, convertbits
+from bech32 import bech32_decode, bech32_encode, convertbits
 
 
 def decode(lnurl: str) -> str:
     hrp, data = bech32_decode(lnurl)
+    assert data
     bech32_data = convertbits(data, 5, 8, False)
+    assert bech32_data
     return bytes(bech32_data).decode("utf-8")
+
+
+def encode(url: str) -> str:
+    bech32_data = convertbits(url.encode("utf-8"), 8, 5, True)
+    assert bech32_data
+    lnurl = bech32_encode("lnurl", bech32_data)
+    return lnurl.upper()