feat: add spintax support for email templates

backend/campaigns/tasks.py

@@ -10,6 +10,7 @@
 from .sms_service import send_sms, initiate_call
 from .models import CampaignLead, SequenceStep
 from leads.models import BlockedDomain, normalize_domain
+from .utils import parse_spintax
 
 logger = logging.getLogger(__name__)
 
@@ -458,6 +459,9 @@ def send_email_step(campaign_lead_id, step_id):
             return
 
         subject, body = personalize_email(step.template_subject, step.template_body, clead.lead)
+
+        subject = parse_spintax(subject)
+        body = parse_spintax(body)
 
         account = clead.campaign.connected_account
         if account:

backend/campaigns/utils.py

@@ -1,12 +1,35 @@
 from django.core.signing import Signer, BadSignature
+import random
+import re
 
 signer = Signer()
 
+
 def generate_unsubscribe_token(lead_id):
     return signer.sign(str(lead_id))
 
+
 def verify_unsubscribe_token(token):
     try:
         return signer.unsign(token)
     except BadSignature:
-        return None
+        return None
+
+
+def parse_spintax(text):
+    if not text:
+        return text
+
+    pattern = r"\{([^{}]*\|[^{}]*)\}"
+
+    while re.search(pattern, text):
+        text = re.sub(
+            pattern,
+            lambda match: random.choice(
+                match.group(1).split("|")
+            ),
+            text,
+            count=1,
+        )
+
+    return text