Format code, remove use of Mellium JID parser, and add indicator for messages originating from WebXDC apps

xmpp-webxdc.go

@@ -0,0 +1,21 @@
+package main
+
+// Implementation of XEP-0491: WebXDC
+// https://xmpp.org/extensions/xep-0491.html
+
+import (
+	"encoding/xml"
+	"gosrc.io/xmpp/stanza"
+)
+
+type XDCEl struct {
+	stanza.MsgExtension
+	XMLName xml.Name `xml:"urn:xmpp:webxdc:0 x"`
+	Document   string   `xml:"document"`
+	Summary   string   `xml:"summary"`
+	Payload string `xml:"urn:xmpp:json:0 json"` // TODO: Independent JSOn container type (XEP-0335)
+}
+
+func init() {
+	stanza.TypeRegistry.MapExtension(stanza.PKTMessage, xml.Name{Space: "urn:xmpp:webxdc:0", Local: "x"}, XDCEl{})
+}