new file mode 100644
--- /dev/null
+++ b/plugins/presence.js
@@ -0,0 +1,57 @@
+'use strict';
+
+/**
+  Copyright (c) 2011, Sonny Piers <sonny at fastmail dot net>
+  Copyright (c) 2012, Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
+
+  Permission to use, copy, modify, and/or distribute this software for any
+  purpose with or without fee is hereby granted, provided that the above
+  copyright notice and this permission notice appear in all copies.
+
+  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+////////////
+//Presence// http://xmpp.org/rfcs/rfc6121.html#presence
+////////////
+(function() {
+  var legal_types = ['error', 'probe', 'subscribe', 'subscribed', 'unavailable', 'unsubscribe', 'unsubscribed'];
+
+  Lightstring.stanza.presence = function(object) {
+    if (object) {
+      var payloads = "";
+      var attributs = "";
+      if (object.type && legal_types.indexOf(object.type) !== -1)
+        attributs += " type='" + object.type + "'";
+
+      if (object.priority)
+        payloads += "<priority>" + object.priority + "</priority>";
+
+      if (object.show)
+        payloads += "<show>" + object.show + "</show>";
+
+      if (object.status)
+        payloads += "<status>" + object.status + "</status>";
+
+      if (object.payload)
+        payloads += object.payload;
+
+      if (payloads)
+        return "<presence" + attributs + ">" + payloads + "</presence>";
+      else
+        return "<presence" + attributs + "/>";
+
+    } else
+      return "<presence/>";
+  };
+
+  Lightstring.presence = function(aConnection, aObject) {
+    aConnection.send(Lightstring.stanza.presence(aObject));
+  };
+})();