Refactor IQ handling and merge payload iq struct fields for supported XEPs

xmpp/auth.go

@@ -66,8 +66,11 @@ type saslFailure struct {
 
 type bindBind struct {
 	XMLName  xml.Name `xml:"urn:ietf:params:xml:ns:xmpp-bind bind"`
-	Resource string
-	Jid      string
+	Resource string   `xml:"resource,omitempty"`
+	Jid      string   `xml:"jid,omitempty"`
+}
+
+func (*bindBind) IsIQPayload() {
 }
 
 // Session is obsolete in RFC 6121.

xmpp/iot/control.go

@@ -2,16 +2,24 @@ package iot
 
 import "encoding/xml"
 
+/*
 type Control struct {
 	ControlSet     ControlSet     `xml:",omitempty"`
 	ControlGetForm ControlGetForm `xml:",omitempty"`
 }
 
+func (*Control) IQPayload() {
+}
+*/
+
 type ControlSet struct {
 	XMLName xml.Name       `xml:"urn:xmpp:iot:control set"`
 	Fields  []ControlField `xml:",any"`
 }
 
+func (*ControlSet) IsIQPayload() {
+}
+
 type ControlGetForm struct {
 	XMLName xml.Name `xml:"urn:xmpp:iot:control getForm"`
 }

xmpp/iq.go

@@ -10,9 +10,66 @@ import (
 type ClientIQ struct {
 	XMLName xml.Name `xml:"jabber:client iq"`
 	Packet
-	Bind bindBind `xml:",omitempty"`
-	iot.Control
+	Payload IQPayload `xml:",omitempty"`
 	RawXML  string    `xml:",innerxml"`
 	// TODO We need to support detecting the IQ namespace / Query packet
 	// 	Error   clientError
 }
+
+type IQPayload interface {
+	IsIQPayload()
+}
+
+// UnmarshalXML implements custom parsing for IQs
+func (iq *ClientIQ) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
+	iq.XMLName = start.Name
+	// Extract IQ attributes
+	for _, attr := range start.Attr {
+		if attr.Name.Local == "id" {
+			iq.Id = attr.Value
+		}
+		if attr.Name.Local == "to" {
+			iq.To = attr.Value
+		}
+		if attr.Name.Local == "from" {
+			iq.From = attr.Value
+		}
+		if attr.Name.Local == "lang" {
+			iq.Lang = attr.Value
+		}
+	}
+
+	// decode inner elements
+	for {
+		t, err := d.Token()
+		if err != nil {
+			return err
+		}
+
+		var p IQPayload
+		switch tt := t.(type) {
+
+		case xml.StartElement:
+			switch tt.Name.Space + " " + tt.Name.Local {
+			case "urn:ietf:params:xml:ns:xmpp-bind bind":
+				p = new(bindBind)
+			case "urn:xmpp:iot:control set":
+				p = new(iot.ControlSet)
+				// TODO: Add a default Type that passes RawXML
+			}
+			if p != nil {
+				err = d.DecodeElement(p, &tt)
+				if err != nil {
+					return err
+				}
+				iq.Payload = p
+				p = nil
+			}
+
+		case xml.EndElement:
+			if tt == start.End() {
+				return nil
+			}
+		}
+	}
+}

xmpp/session.go

@@ -154,11 +154,18 @@ func (s *Session) bind(o Options) {
 	}
 
 	var iq ClientIQ
-	if s.err = s.decoder.Decode(&iq); s.err != nil || &iq.Bind == nil {
-		s.err = errors.New("iq bind result missing: " + s.err.Error())
+	if s.err = s.decoder.Decode(&iq); s.err != nil {
+		s.err = errors.New("error decoding iq bind result: " + s.err.Error())
 		return
 	}
-	s.BindJid = iq.Bind.Jid // our local id (with possibly randomly generated resource
+
+	switch payload := iq.Payload.(type) {
+	case *bindBind:
+		s.BindJid = payload.Jid // our local id (with possibly randomly generated resource
+	default:
+		s.err = errors.New("iq bind result missing")
+	}
+
 	return
 }