Implement TLS listener support

lib/nntp/tiny/server.py

@@ -1,5 +1,6 @@
 import enum
 import socket
+import ssl
 import threading
 
 from configparser import ConfigParser
@@ -18,6 +19,12 @@ class Server():
         self.config       = config
         self.capabilities = ServerCapability.NONE
         self.newsgroups   = dict()
+        self.sslctx       = None
+
+        if config['listen'].get('tls', 'no') == 'yes':
+            self.sslctx = ssl.SSLContext(ssl.PROTOCOL_TLS_SERVER)
+            self.sslctx.load_cert_chain(config['tls']['cert'],
+                                        config['tls']['key'])
 
         self._init_newsgroups()
 
@@ -38,14 +45,20 @@ class Server():
         listener.bind((host, port))
         listener.listen()
 
+        if self.sslctx:
+            listener = self.sslctx.wrap_socket(listener, server_side=True)
+
         while True:
-            sock, addr = listener.accept()
+            try:
+                sock, addr = listener.accept()
 
-            def spawn():
-                session = Session(self, sock)
-                session.handle()
+                def spawn():
+                    session = Session(self, sock)
+                    session.handle()
 
-            thread = threading.Thread(target=spawn)
-            thread.start()
+                thread = threading.Thread(target=spawn)
+                thread.start()
+            except:
+                pass
 
         listener.close()