Use issubclass instead of isinstance in Singer construct

archamoney · Aug 25, 2020 · 77c42ad · 77c42ad
1 parent 1b061f9
commit 77c42ad
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/httpsig/sign.py b/httpsig/sign.py
@@ -79,7 +79,7 @@ def sign(self, data):
             signed = self._sign_rsa(data)
         elif self._hash:
             signed = self._sign_hmac(data)
-        elif isinstance(self.sign_algorithm, SignAlgorithm):
+        elif issubclass(type(self.sign_algorithm), SignAlgorithm):
             signed = self.sign_algorithm.sign(self.secret, data)
         if not signed:
             raise SystemError('No valid encryptor found.')