Wallets/unhashed_description (#870)

* new argument: unhashed_description

* accept in api

* set unhashed_description for memo case

* bolt11.py: dont be like CLN, accept the hash

* send hash to lnd in b64

* fix cln

* skip descr_hash for cln

* skip

* format

lnbits/wallets/spark.py

@@ -93,6 +93,8 @@ class SparkWallet(Wallet):
         amount: int,
         memo: Optional[str] = None,
         description_hash: Optional[bytes] = None,
+        unhashed_description: Optional[bytes] = None,
+        **kwargs,
     ) -> InvoiceResponse:
         label = "lbs{}".format(random.random())
         checking_id = label
@@ -102,7 +104,13 @@ class SparkWallet(Wallet):
                 r = await self.invoicewithdescriptionhash(
                     msatoshi=amount * 1000,
                     label=label,
-                    description_hash=hashlib.sha256(description_hash).hexdigest(),
+                    description_hash=description_hash.hex(),
+                )
+            elif unhashed_description:
+                r = await self.invoicewithdescriptionhash(
+                    msatoshi=amount * 1000,
+                    label=label,
+                    description_hash=hashlib.sha256(unhashed_description).hexdigest(),
                 )
             else:
                 r = await self.invoice(