fix DKIM cname check

app/dashboard/views/domain_detail.py

@@ -74,7 +74,7 @@ def domain_detail_dns(custom_domain_id):
                 spf_errors = get_txt_record(custom_domain.domain)
 
         elif request.form.get("form-name") == "check-dkim":
-            dkim_record = get_cname_record(custom_domain.domain)
+            dkim_record = get_cname_record("dkim._domainkey." + custom_domain.domain)
             if dkim_record == dkim_cname:
                 flash("DKIM is setup correctly.", "success")
                 custom_domain.dkim_verified = True

app/dns_utils.py

@@ -13,14 +13,15 @@ def _get_dns_resolver():
 
 
 def get_cname_record(hostname) -> Optional[str]:
-    """Return the CNAME record if exists for a domain"""
+    """Return the CNAME record if exists for a domain, WITHOUT the trailing period at the end"""
     try:
         answers = _get_dns_resolver().query(hostname, "CNAME")
     except Exception:
         return None
 
     for a in answers:
-        return a
+        ret = a.to_text()
+        return ret[:-1]
 
     return None