Fix Webhooks on withdraw (#2)

* make webhook toggle not undefined
* undefined toggle at update and stringify webhook
* remove comment
* remove json stringify
* json validation serverside
* Fix updating withdraw links with webhook info
* make webhook toggle not undefined
* undefined toggle at update and stringify webhook
* remove comment
* remove json stringify
* Fix updating withdraw links with webhook info
* fix: use arrow functions

---------

Co-authored-by: dni ⚡ <office@dnilabs.com>
Co-authored-by: Vlad Stan <stan.v.vlad@gmail.com>

views_api.py

@@ -1,5 +1,6 @@
 from http import HTTPStatus
 from typing import Optional
+import json
 
 from fastapi import Depends, HTTPException, Query, Request
 from lnurl.exceptions import InvalidUrl as LnurlInvalidUrl
@@ -84,6 +85,24 @@ async def api_link_create_or_update(
             status_code=HTTPStatus.BAD_REQUEST,
         )
 
+    if data.webhook_body:
+        try:
+            json.loads(data.webhook_body)
+        except:
+            raise HTTPException(
+                detail="`webhook_body` can not parse JSON.",
+                status_code=HTTPStatus.BAD_REQUEST,
+            )
+
+    if data.webhook_headers:
+        try:
+            json.loads(data.webhook_headers)
+        except:
+            raise HTTPException(
+                detail="`webhook_headers` can not parse JSON.",
+                status_code=HTTPStatus.BAD_REQUEST,
+            )
+
     if link_id:
         link = await get_withdraw_link(link_id, 0)
         if not link: