feat: pass data through lnurl for webhook (#31)

* feat: pass through data with lnurl

lnurl.py

@@ -22,9 +22,11 @@ from .crud import (
     name="lnurlp.api_lnurl_lnaddr_callback",
 )
 async def api_lnurl_lnaddr_callback(
-    request: Request, link_id, amount: int = Query(...)
+    request: Request, link_id, amount: int = Query(...), webhook_data: str = Query(None)
 ):
-    return await api_lnurl_callback(request, link_id, amount, lnaddress=True)
+    return await api_lnurl_callback(
+        request, link_id, amount, webhook_data, lnaddress=True
+    )
 
 
 @lnurlp_ext.get(
@@ -33,7 +35,11 @@ async def api_lnurl_lnaddr_callback(
     name="lnurlp.api_lnurl_callback",
 )
 async def api_lnurl_callback(
-    request: Request, link_id, amount: int = Query(...), lnaddress=False
+    request: Request,
+    link_id,
+    amount: int = Query(...),
+    webhook_data: str = Query(None),
+    lnaddress=False,
 ):
     link = await increment_pay_link(link_id, served_pr=1)
     if not link:
@@ -64,11 +70,15 @@ async def api_lnurl_callback(
     comment = request.query_params.get("comment")
     if len(comment or "") > link.comment_chars:
         return LnurlErrorResponse(
-            reason=f"Got a comment with {len(comment)} characters, but can only accept {link.comment_chars}"
+            reason=(
+                f"Got a comment with {len(comment or '')} characters, "
+                f"but can only accept {link.comment_chars}"
+            )
         ).dict()
 
     if lnaddress:
-        # for lnaddress, we have to set this otherwise the metadata won't have the identifier
+        # for lnaddress, we have to set this otherwise
+        # the metadata won't have the identifier
         link.domain = urlparse(str(request.url)).netloc
 
     extra = {
@@ -80,6 +90,9 @@ async def api_lnurl_callback(
     if comment:
         extra["comment"] = (comment,)
 
+    if webhook_data:
+        extra["webhook_data"] = webhook_data
+
     # nip 57
     nostr = request.query_params.get("nostr")
     if nostr:
@@ -88,13 +101,14 @@ async def api_lnurl_callback(
     if lnaddress and link.username and link.domain:
         extra["lnaddress"] = f"{link.username}@{link.domain}"
 
+    # we take the zap request as the description instead of the metadata if present
+    unhashed_description = nostr.encode() if nostr else link.lnurlpay_metadata.encode()
+
     payment_hash, payment_request = await create_invoice(
         wallet_id=link.wallet,
         amount=int(amount / 1000),
         memo=link.description,
-        unhashed_description=nostr.encode()
-        if nostr  # we take the zap request as the description instead of the LNURL metadata if present
-        else link.lnurlpay_metadata.encode(),
+        unhashed_description=unhashed_description,
         extra=extra,
     )
 
@@ -110,7 +124,7 @@ async def api_lnurl_callback(
 
 
 @lnurlp_ext.get(
-    "/api/v1/lnurl/{link_id}",  # Backwards compatibility for old LNURLs / QR codes (with long URL)
+    "/api/v1/lnurl/{link_id}",  # Backwards compatibility for old LNURLs / QR codes
     status_code=HTTPStatus.OK,
     name="lnurlp.api_lnurl_response.deprecated",
 )
@@ -119,7 +133,9 @@ async def api_lnurl_callback(
     status_code=HTTPStatus.OK,
     name="lnurlp.api_lnurl_response",
 )
-async def api_lnurl_response(request: Request, link_id, lnaddress=False):
+async def api_lnurl_response(
+    request: Request, link_id, webhook_data: str = Query(None), lnaddress=False
+):
     link = await increment_pay_link(link_id, served_meta=1)
     if not link:
         raise HTTPException(
@@ -129,13 +145,25 @@ async def api_lnurl_response(request: Request, link_id, lnaddress=False):
     rate = await get_fiat_rate_satoshis(link.currency) if link.currency else 1
 
     if lnaddress:
-        # for lnaddress, we have to set this otherwise the metadata won't have the identifier
+        # for lnaddress, we have to set this otherwise
+        # the metadata won't have the identifier
         link.domain = urlparse(str(request.url)).netloc
         callback = str(
-            request.url_for("lnurlp.api_lnurl_lnaddr_callback", link_id=link.id)
+            request.url_for(
+                "lnurlp.api_lnurl_lnaddr_callback",
+                link_id=link.id,
+            )
         )
     else:
-        callback = str(request.url_for("lnurlp.api_lnurl_callback", link_id=link.id))
+        callback = str(
+            request.url_for(
+                "lnurlp.api_lnurl_callback",
+                link_id=link.id,
+            )
+        )
+
+    if webhook_data:
+        callback += f"?webhook_data={webhook_data}"
 
     resp = LnurlPayResponse(
         callback=callback,