Defer the creation of XTLS until it's first time used.

This will make Gajim start a bit faster and more entropy can be
generated for key generation.

src/common/check_paths.py

@@ -30,7 +30,6 @@ import stat
 
 from common import gajim
 from common import logger
-from common import jingle_xtls
 
 # DO NOT MOVE ABOVE OF import gajim
 import sqlite3 as sqlite
@@ -350,12 +349,6 @@ def check_and_possibly_create_paths():
         create_path(XTLS_CERTS)
     if not os.path.exists(LOCAL_XTLS_CERTS):
         create_path(LOCAL_XTLS_CERTS)
-    cert_name = os.path.join(LOCAL_XTLS_CERTS,
-        jingle_xtls.SELF_SIGNED_CERTIFICATE)
-    if gajim.HAVE_PYOPENSSL and not (os.path.exists(cert_name + '.cert') and \
-    os.path.exists(cert_name + '.pkey')):
-        jingle_xtls.make_certs(cert_name, 'gajim')
-
 
 def create_path(directory):
     head, tail = os.path.split(directory)

src/common/jingle_ft.py

@@ -19,9 +19,11 @@
 Handles  Jingle File Transfer (XEP 0234)
 """
 
+import os
 import hashlib
 from common import gajim
 import nbxmpp
+from common import configpaths
 from . import jingle_xtls
 from common.jingle_content import contents, JingleContent
 from common.jingle_transport import *
@@ -108,6 +110,13 @@ class JingleFileTransfer(JingleContent):
                    STATE_TRANSPORT_REPLACE : StateTransportReplace(self),
               STATE_CAND_SENT_AND_RECEIVED : StateCandSentAndRecv(self)
         }
+        
+        if jingle_xtls.PYOPENSSL_PRESENT:
+            cert_name = os.path.join(configpaths.gajimpaths['MY_CERT'],
+                                     jingle_xtls.SELF_SIGNED_CERTIFICATE)
+            if not (os.path.exists(cert_name + '.cert')
+                    and os.path.exists(cert_name + '.pkey')):
+                jingle_xtls.make_certs(cert_name, 'gajim')
 
     def __state_changed(self, nextstate, args=None):
         # Executes the next state action and sets the next state