add on_delivery

authhook/on_delivery.js

+function on_delivery(req, res, next) {
+    var topics = beDesireTopic(req.body.topic)
+    var response = {
+        'result': 'ok',
+        'modifiers': {
+            "topic": topics
+        }
+    }
+    res.send(response)
+}
+module.exports.on_delivery = on_delivery
+
+function hasGroup(topics) {
+    if (topics.indexOf('!') > -1) {
+        return true
+    }
+    else return false
+}
+
+function beDesireTopic(topics) {
+    if (hasGroup(topics)) {
+        return joinTopic(topics)
+    }
+    else return topics
+}
+
+function joinTopic(topics) {
+    var topic = topics.split('/!')[1]
+    return topics.split('/!')[0] + topic.substring(topic.indexOf('/'), topic.length)
+}
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