Add support for generating delegation forwarded iq response

component.go

@@ -224,9 +224,9 @@ func (handshakeDecoder) decode(p *xml.Decoder, se xml.StartElement) (Handshake,
 // depending on the context.
 type Delegation struct {
 	MsgExtension
-	XMLName   xml.Name  `xml:"urn:xmpp:delegation:1 delegation"`
-	Forwarded Forwarded // This is used in iq to wrap delegated iqs
-	Delegated Delegated // This is used in a message to confirm delegated namespace
+	XMLName   xml.Name   `xml:"urn:xmpp:delegation:1 delegation"`
+	Forwarded *Forwarded // This is used in iq to wrap delegated iqs
+	Delegated *Delegated // This is used in a message to confirm delegated namespace
 }
 
 func (d *Delegation) Namespace() string {
@@ -234,10 +234,33 @@ func (d *Delegation) Namespace() string {
 }
 
 type Forwarded struct {
-	XMLName  xml.Name `xml:"urn:xmpp:forward:0 forwarded"`
-	IQ       IQ
-	Message  Message
-	Presence Presence
+	XMLName xml.Name `xml:"urn:xmpp:forward:0 forwarded"`
+	Stanza  Packet
+}
+
+// UnmarshalXML is a custom unmarshal function used by xml.Unmarshal to
+// transform generic XML content into hierarchical Node structure.
+func (f *Forwarded) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
+	// Check subelements to extract required field as boolean
+	for {
+		t, err := d.Token()
+		if err != nil {
+			return err
+		}
+
+		switch tt := t.(type) {
+
+		case xml.StartElement:
+			if packet, err := decodeClient(d, tt); err == nil {
+				f.Stanza = packet
+			}
+
+		case xml.EndElement:
+			if tt == start.End() {
+				return nil
+			}
+		}
+	}
 }
 
 type Delegated struct {