Closes #3952: Add test for webhooks_worker; introduce generate_signature()

netbox/extras/webhooks.py

@@ -1,4 +1,6 @@
 import datetime
+import hashlib
+import hmac
 
 from django.contrib.contenttypes.models import ContentType
 
@@ -8,6 +10,18 @@ from .choices import *
 from .constants import *
 
 
+def generate_signature(request_body, secret):
+    """
+    Return a cryptographic signature that can be used to verify the authenticity of webhook data.
+    """
+    hmac_prep = hmac.new(
+        key=secret.encode('utf8'),
+        msg=request_body.encode('utf8'),
+        digestmod=hashlib.sha512
+    )
+    return hmac_prep.hexdigest()
+
+
 def enqueue_webhooks(instance, user, request_id, action):
     """
     Find Webhook(s) assigned to this instance + action and enqueue them