XEP-0065,XEP-0096,XEP-0166,XEP-0235,XEP-0300: file transfer improvments:

huge patch sorry :)

many things are improved by this patch, notably:
- updated to last protocol changes (urn:xmpp:jingle:apps:file-transfer:5 and urn:xmpp:hashes:2)
- XEP-0234: file request implementation
- XEP-0234: methods to parse and generate <file> element (can be used by other plugins easily)
- XEP-0234: range data is now in a namedtuple
- path and namespace can be specified when sending/requesting a file (not standard, but needed for file sharing)
- better error/termination handling
- trigger points to handle file requests by other plugins
- preparation to use file plugins with components

src/plugins/plugin_xep_0166.py

@@ -51,6 +51,7 @@ PLUGIN_INFO = {
     C.PI_NAME: "Jingle",
     C.PI_IMPORT_NAME: "XEP-0166",
     C.PI_TYPE: "XEP",
+    C.PI_MODES: C.PLUG_MODE_BOTH,
     C.PI_PROTOCOLS: ["XEP-0166"],
     C.PI_MAIN: "XEP_0166",
     C.PI_HANDLER: "yes",
@@ -318,6 +319,8 @@ class XEP_0166(object):
         @return D(unicode): jingle session id
         """
         assert contents # there must be at least one content
+        if peer_jid == client.jid:
+            raise ValueError(_(u"You can't do a jingle session with yourself"))
         initiator = client.jid
         sid = unicode(uuid.uuid4())
         # TODO: session cleaning after timeout ?
@@ -385,9 +388,12 @@ class XEP_0166(object):
             transport_elt = yield transport.handler.jingleSessionInit(client, session, content_name)
             content_elt.addChild(transport_elt)
 
-        d = iq_elt.send()
-        d.addErrback(self._iqError, sid, client)
-        yield d
+        try:
+            yield iq_elt.send()
+        except Exception as e:
+            failure_ = failure.Failure(e)
+            self._iqError(failure_, sid, client)
+            raise failure_
 
     def delayedContentTerminate(self, *args, **kwargs):
         """Put contentTerminate in queue but don't execute immediately
@@ -758,7 +764,7 @@ class XEP_0166(object):
         try:
             reason_elt = jingle_elt.elements(NS_JINGLE, 'reason').next()
         except StopIteration:
-            log.warning(u"Not reason given for session termination")
+            log.warning(u"No reason given for session termination")
             reason_elt = jingle_elt.addElement('reason')
 
         terminate_defers = self._callPlugins(client, XEP_0166.A_SESSION_TERMINATE, session, 'jingleTerminate', 'jingleTerminate', self._ignore, self._ignore, elements=False, force_element=reason_elt)