From ea1698499f1f1b73aedd8a627a576f4347495414 Mon Sep 17 00:00:00 2001
From: jesopo
Date: Wed, 18 Sep 2019 10:18:49 +0100
Subject: through error when fediverse server is configured but crypto is
 missing

---
 modules/fediverse/ap_security.py | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

(limited to 'modules/fediverse/ap_security.py')

diff --git a/modules/fediverse/ap_security.py b/modules/fediverse/ap_security.py
index 1ffd3fdb..391c58de 100644
--- a/modules/fediverse/ap_security.py
+++ b/modules/fediverse/ap_security.py
@@ -1,12 +1,16 @@
 import base64, typing
-from cryptography.hazmat.primitives import hashes, serialization
-from cryptography.hazmat.primitives.asymmetric import padding, rsa
-from cryptography.hazmat.backends import default_backend
+
+try:
+    from cryptography.hazmat.primitives import hashes, serialization
+    from cryptography.hazmat.primitives.asymmetric import padding, rsa
+    from cryptography.hazmat.backends import default_backend
+    has_crypto = True
+except ModuleNotFoundError:
+    has_crypto = False
 
 SIGNATURE_FORMAT = (
     "keyId=\"%s\",headers=\"%s\",signature=\"%s\",algorithm=\"rsa-sha256\"")
 
-
 def _private_key(key_filename: str) -> rsa.RSAPrivateKey:
     with open(key_filename, "rb") as key_file:
         return serialization.load_pem_private_key(
-- 
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