updating ssl context codition

stix_shifter_utils/stix_transmission/utils/RestApiClientAsync.py

@@ -71,6 +71,12 @@ def __init__(self, host, port=None, headers={}, url_modifier_function=None, cert
         # self signed cert provided
         elif isinstance(cert_verify, str):
             self.server_cert_file_content = cert_verify
+            self.ssl_context = True
+
+        if self.ssl_context:
+            self.ssl_context = ssl.SSLContext(ssl.PROTOCOL_TLS)
+            self.ssl_context.verify_mode = ssl.CERT_REQUIRED
+            self.ssl_context.check_hostname = True
 
         self.headers = headers
         self.url_modifier_function = url_modifier_function
@@ -86,16 +92,12 @@ async def call_api(self, endpoint, method, headers=None, cookies=None, data=None
                         f.write(self.server_cert_file_content)
                     except IOError:
                         self.logger.error('Failed to setup certificate')
-
-            self.ssl_context = ssl.SSLContext(ssl.PROTOCOL_TLS)
 
-            try:
-                self.ssl_context.load_verify_locations(self.server_cert_name)
-            except Exception as ex:
-                self.logger.debug('Unable to load the certificate for ssl context. Reasons: Connection does not require certifcate or unexpected exception while loading the certificate: ' + str(ex))
-
-            self.ssl_context.verify_mode = ssl.CERT_REQUIRED
-            self.ssl_context.check_hostname = True
+            if self.ssl_context and self.server_cert_file_content:
+                try:
+                    self.ssl_context.load_verify_locations(self.server_cert_name)
+                except Exception as ex:
+                    self.logger.debug('Unable to load the certificate for ssl context. Reasons: Connection does not require certificate or unexpected exception while loading the certificate: ' + str(ex))
 
             url = None
             actual_headers = self.headers.copy()