From 4565995be748a661ffc7e2b14ed37ff32b9fa3fa Mon Sep 17 00:00:00 2001
From: Timothy Noel <tnoel@bluecatnetworks.com>
Date: Wed, 11 Oct 2023 16:05:44 -0400
Subject: [PATCH] fix for incorrect alpn in ja4s. Issue #11

---
 python/ja4.py | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/python/ja4.py b/python/ja4.py
index 81b778e..76a5ccd 100644
--- a/python/ja4.py
+++ b/python/ja4.py
@@ -186,8 +186,11 @@ def to_ja4s(x, debug_stream):
     alpn = '00' 
     if 'alpn' in x: 
         alpn = x['alpn']
-    elif 'alpn_list' in x and isinstance(x['alpn_list'], list):
-        alpn = x['alpn_list'][0]
+    elif 'alpn_list' in x:
+        if isinstance(x['alpn_list'], list):
+            alpn = x['alpn_list'][0]
+        else:
+            alpn = x['alpn_list']
 
     x['JA4S'] = f"{ptype}{version}{ext_len}{alpn}_{x['ciphers']}_{extensions}"
     x['JA4S_r'] = f"{ptype}{version}{ext_len}{alpn}_{x['ciphers']}_{','.join(x['extensions'])}"