fix validation of notifcation by sender/from address

Reviewed-on: #19

distributor/xmpp.go

@@ -113,7 +113,7 @@ func (s *XMPPService) message(msgHead stanza.Message, t xmlstream.TokenReadEncod
 		return nil
 	}
 	from := msgHead.From.String()
-	if settings := strings.Split(conn.Settings, ":"); len(settings) > 1 && settings[0] == from {
+	if settings := strings.Split(conn.Settings, ":"); !(len(settings) > 1 && settings[0] == from) {
 		log.WithField("from", from).Info("message not from gateway, that is no notification")
 		return nil
 	}

gateway/README.md

@@ -11,24 +11,6 @@ So the XMPP-Address could be readed by Application-Server, Application and Distr
 
 The XMPP Component implements [XEP-0225](https://xmpp.org/extensions/xep-0225.html) it could be plugged in at every common server (like [ejabberd](https://docs.ejabberd.im/admin/configuration/listen/#ejabberd-service) or [Prosody](https://prosody.im/doc/components)) with an Secret and domain name.
 
-## XMPP Specials
-
-### Service Discovery XEP-0030
-As Part of the XMPP-Component we implement the following result of an Service Discovery:
-```xml
-<iq type='result'
-    from='up.chat.sum7.eu'
-    id='iq-disco-request'>
-  <query xmlns='http://jabber.org/protocol/disco#info'>
-    <identity
-        category='pubsub'
-        type='push'
-        name='Unified Push over XMPP'/>
-    <feature var='unifiedpush.org'/>
-  </query>
-</iq
-```
-
 ## Install
 
 How to configure this gateway take a look into the [config_example.toml](config_example.toml), we prefer it place it under `/etc/up-gateway.conf`