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Merge pull request #4 from FluuxIO/component

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Add initial support for XMPP components
This commit is contained in:
Mickaël Rémond 2018-01-13 19:33:45 +01:00 committed by GitHub
commit ceeb51ce0e
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GPG Key ID: 4AEE18F83AFDEB23
18 changed files with 419 additions and 85 deletions
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49
auth.go
View File

@ -32,37 +32,72 @@ func authPlain(socket io.ReadWriter, decoder *xml.Decoder, user string, password
fmt.Fprintf(socket, "<auth xmlns='%s' mechanism='PLAIN'>%s</auth>", nsSASL, enc)
// Next message should be either success or failure.
name, val, err := next(decoder)
val, err := next(decoder)
if err != nil {
return err
}
switch v := val.(type) {
case *saslSuccess:
case *saslFailure:
case SASLSuccess:
case SASLFailure:
// v.Any is type of sub-element in failure, which gives a description of what failed.
return errors.New("auth failure: " + v.Any.Local)
default:
return errors.New("expected success or failure, got " + name.Local + " in " + name.Space)
return errors.New("expected SASL success or failure, got " + v.Name())
}
return err
}
// XMPP Packet Parsing
type saslMechanisms struct {
XMLName xml.Name `xml:"urn:ietf:params:xml:ns:xmpp-sasl mechanisms"`
Mechanism []string `xml:"mechanism"`
}
type saslSuccess struct {
// ============================================================================
// SASLSuccess
type SASLSuccess struct {
XMLName xml.Name `xml:"urn:ietf:params:xml:ns:xmpp-sasl success"`
}
type saslFailure struct {
func (SASLSuccess) Name() string {
return "sasl:success"
}
type saslSuccessDecoder struct{}
var saslSuccess saslSuccessDecoder
func (saslSuccessDecoder) decode(p *xml.Decoder, se xml.StartElement) (SASLSuccess, error) {
var packet SASLSuccess
err := p.DecodeElement(&packet, &se)
return packet, err
}
// ============================================================================
// SASLFailure
type SASLFailure struct {
XMLName xml.Name `xml:"urn:ietf:params:xml:ns:xmpp-sasl failure"`
Any xml.Name // error reason is a subelement
}
func (SASLFailure) Name() string {
return "sasl:failure"
}
type saslFailureDecoder struct{}
var saslFailure saslFailureDecoder
func (saslFailureDecoder) decode(p *xml.Decoder, se xml.StartElement) (SASLFailure, error) {
var packet SASLFailure
err := p.DecodeElement(&packet, &se)
return packet, err
}
// ============================================================================
type auth struct {
XMLName xml.Name `xml:"urn:ietf:params:xml:ns:xmpp-sasl auth"`
Mechanism string `xml:"mecanism,attr"`

4
client.go
View File

@ -108,7 +108,7 @@ func (c *Client) Connect() (*Session, error) {
func (c *Client) recv(receiver chan<- interface{}) (err error) {
for {
_, val, err := next(c.Session.decoder)
val, err := next(c.Session.decoder)
if err != nil {
return err
}
@ -128,7 +128,7 @@ func (c *Client) Recv() <-chan interface{} {
// Send sends message text.
func (c *Client) Send(packet string) error {
fmt.Fprintf(c.Session.socketProxy, packet)
fmt.Fprintf(c.Session.socketProxy, packet) // TODO handle errors
return nil
}

2
client_test.go
View File

@ -163,7 +163,7 @@ func bind(t *testing.T, c net.Conn, decoder *xml.Decoder) {
return
}
iq := &ClientIQ{}
iq := &IQ{}
// Decode element into pointer storage
if err = decoder.DecodeElement(&iq, &se); err != nil {
t.Errorf("cannot decode bind iq: %s", err)

32
cmd/xmpp_component/xmpp_component.go Normal file
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@ -0,0 +1,32 @@
package main
import (
"fmt"
"fluux.io/xmpp"
)
func main() {
component := xmpp.Component{Host: "mqtt.localhost", Secret: "mypass"}
component.Connect("localhost:8888")
for {
packet, err := component.ReadPacket()
if err != nil {
fmt.Println("read error", err)
return
}
switch p := packet.(type) {
case xmpp.IQ:
switch inner := p.Payload.(type) {
case *xmpp.Node:
fmt.Println("Node:", inner.XMLName.Space, inner.XMLName.Local)
default:
fmt.Println("default")
}
default:
fmt.Println("Packet unhandled packet:", packet)
}
}
}

4
cmd/xmpp_echo/xmpp_echo.go
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@ -31,9 +31,9 @@ func main() {
// Iterator to receive packets coming from our XMPP connection
for packet := range client.Recv() {
switch packet := packet.(type) {
case *xmpp.ClientMessage:
case *xmpp.Message:
fmt.Fprintf(os.Stdout, "Body = %s - from = %s\n", packet.Body, packet.From)
reply := xmpp.ClientMessage{Packet: xmpp.Packet{To: packet.From}, Body: packet.Body}
reply := xmpp.Message{PacketAttrs: xmpp.PacketAttrs{To: packet.From}, Body: packet.Body}
client.Send(reply.XMPPFormat())
default:
fmt.Fprintf(os.Stdout, "Ignoring packet: %T\n", packet)

12
cmd/xmpp_jukebox/xmpp_jukebox.go
View File

@ -40,11 +40,11 @@ func main() {
for packet := range client.Recv() {
switch packet := packet.(type) {
case *xmpp.ClientMessage:
case *xmpp.Message:
processMessage(client, p, packet)
case *xmpp.ClientIQ:
case *xmpp.IQ:
processIq(client, p, packet)
case *xmpp.ClientPresence:
case *xmpp.Presence:
// Do nothing with received presence
default:
fmt.Fprintf(os.Stdout, "Ignoring packet: %T\n", packet)
@ -52,7 +52,7 @@ func main() {
}
}
func processMessage(client *xmpp.Client, p *mpg123.Player, packet *xmpp.ClientMessage) {
func processMessage(client *xmpp.Client, p *mpg123.Player, packet *xmpp.Message) {
command := strings.Trim(packet.Body, " ")
if command == "stop" {
p.Stop()
@ -62,7 +62,7 @@ func processMessage(client *xmpp.Client, p *mpg123.Player, packet *xmpp.ClientMe
}
}
func processIq(client *xmpp.Client, p *mpg123.Player, packet *xmpp.ClientIQ) {
func processIq(client *xmpp.Client, p *mpg123.Player, packet *xmpp.IQ) {
switch payload := packet.Payload.(type) {
// We support IOT Control IQ
case *iot.ControlSet:
@ -76,7 +76,7 @@ func processIq(client *xmpp.Client, p *mpg123.Player, packet *xmpp.ClientIQ) {
playSCURL(p, url)
setResponse := new(iot.ControlSetResponse)
reply := xmpp.ClientIQ{Packet: xmpp.Packet{To: packet.From, Type: "result", Id: packet.Id}, Payload: setResponse}
reply := xmpp.IQ{PacketAttrs: xmpp.PacketAttrs{To: packet.From, Type: "result", Id: packet.Id}, Payload: setResponse}
client.Send(reply.XMPPFormat())
// TODO add Soundclound artist / title retrieval
sendUserTune(client, "Radiohead", "Spectre")

116
component.go Normal file
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@ -0,0 +1,116 @@
package xmpp
import (
"crypto/sha1"
"encoding/hex"
"encoding/xml"
"errors"
"fmt"
"io"
"net"
"time"
)
const componentStreamOpen = "<?xml version='1.0'?><stream:stream to='%s' xmlns='%s' xmlns:stream='%s'>"
// Component implements an XMPP extension allowing to extend XMPP server
// using external components. Component specifications are defined
// in XEP-0114, XEP-0355 and XEP-0356.
type Component struct {
Host string
Secret string
// TCP level connection
conn net.Conn
// read / write
socketProxy io.ReadWriter // TODO
decoder *xml.Decoder
}
// handshake generates an authentication token based on StreamID and shared secret.
func (c *Component) handshake(streamId string) string {
// 1. Concatenate the Stream ID received from the server with the shared secret.
concatStr := streamId + c.Secret
// 2. Hash the concatenated string according to the SHA1 algorithm, i.e., SHA1( concat (sid, password)).
h := sha1.New()
h.Write([]byte(concatStr))
hash := h.Sum(nil)
// 3. Ensure that the hash output is in hexadecimal format, not binary or base64.
// 4. Convert the hash output to all lowercase characters.
encodedStr := hex.EncodeToString(hash)
return encodedStr
}
// TODO Helper to prepare connection string
func (c *Component) Connect(connStr string) error {
var conn net.Conn
var err error
if conn, err = net.DialTimeout("tcp", connStr, time.Duration(5)*time.Second); err != nil {
return err
}
c.conn = conn
// 1. Send stream open tag
if _, err := fmt.Fprintf(conn, componentStreamOpen, c.Host, NSComponent, NSStream); err != nil {
return errors.New("cannot send stream open " + err.Error())
}
c.decoder = xml.NewDecoder(conn)
// 2. Initialize xml decoder and extract streamID from reply
streamId, err := initDecoder(c.decoder)
if err != nil {
return errors.New("cannot init decoder " + err.Error())
}
// 3. Authentication
if _, err := fmt.Fprintf(conn, "<handshake>%s</handshake>", c.handshake(streamId)); err != nil {
return errors.New("cannot send handshake " + err.Error())
}
// 4. Check server response for authentication
val, err := next(c.decoder)
if err != nil {
return err
}
switch v := val.(type) {
case *StreamError:
return errors.New("handshake failed " + v.Error.Local)
case *Handshake:
return nil
default:
return errors.New("unexpected packet, got " + v.Name())
}
panic("unreachable")
}
// ReadPacket reads next incoming XMPP packet
// TODO use defined interface Packet
func (c *Component) ReadPacket() (Packet, error) {
return next(c.decoder)
}
// ============================================================================
// Handshake Packet
type Handshake struct {
XMLName xml.Name `xml:"jabber:component:accept handshake"`
}
func (Handshake) Name() string {
return "component:handshake"
}
type handshakeDecoder struct{}
var handshake handshakeDecoder
func (handshakeDecoder) decode(p *xml.Decoder, se xml.StartElement) (Handshake, error) {
var packet Handshake
err := p.DecodeElement(&packet, &se)
return packet, err
}

18
component_test.go Normal file
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@ -0,0 +1,18 @@
package xmpp
import "testing"
func TestHandshake(t *testing.T) {
c := Component{
Host: "test.localhost",
Secret: "mypass",
}
streamID := "1263952298440005243"
expected := "c77e2ef0109fbbc5161e83b51629cd1353495332"
result := c.handshake(streamID)
if result != expected {
t.Errorf("incorrect handshake calculation '%s' != '%s'", result, expected)
}
}

42
iq.go
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@ -7,22 +7,38 @@ import (
"fluux.io/xmpp/iot"
)
// info/query
type ClientIQ struct {
XMLName xml.Name `xml:"jabber:client iq"`
Packet
// ============================================================================
// IQ Packet
type IQ struct { // Info/Query
XMLName xml.Name `xml:"iq"`
PacketAttrs
Payload IQPayload `xml:",omitempty"`
RawXML string `xml:",innerxml"`
// TODO We need to support detecting the IQ namespace / Query packet
// Error clientError
}
func (IQ) Name() string {
return "iq"
}
type iqDecoder struct{}
var iq iqDecoder
func (iqDecoder) decode(p *xml.Decoder, se xml.StartElement) (IQ, error) {
var packet IQ
err := p.DecodeElement(&packet, &se)
return packet, err
}
type IQPayload interface {
IsIQPayload()
}
// UnmarshalXML implements custom parsing for IQs
func (iq *ClientIQ) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
func (iq *IQ) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
iq.XMLName = start.Name
// Extract IQ attributes
for _, attr := range start.Attr {
@ -59,7 +75,8 @@ func (iq *ClientIQ) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
p = new(bindBind)
case "urn:xmpp:iot:control set":
p = new(iot.ControlSet)
// TODO: Add a default Type that passes RawXML
default:
p = new(Node)
}
if p != nil {
err = d.DecodeElement(p, &tt)
@ -80,7 +97,7 @@ func (iq *ClientIQ) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
// XMPPFormat returns the string representation of the XMPP packet.
// TODO: Should I simply rely on xml.Marshal ?
func (iq *ClientIQ) XMPPFormat() string {
func (iq *IQ) XMPPFormat() string {
if iq.Payload != nil {
var payload []byte
var err error
@ -98,3 +115,14 @@ func (iq *ClientIQ) XMPPFormat() string {
iq.To, iq.Type, iq.Id,
iq.RawXML)
}
// ============================================================================
// Genery IQ Node
type Node struct {
XMLName xml.Name
Content []byte `xml:",innerxml"`
Nodes []Node `xml:",any"`
}
func (*Node) IsIQPayload() {}

8
iq_test.go
View File

@ -10,14 +10,14 @@ func TestUnmarshalIqs(t *testing.T) {
//var cs1 = new(iot.ControlSet)
var tests = []struct {
iqString string
parsedIQ ClientIQ
parsedIQ IQ
}{
{"<iq id=\"1\" type=\"set\" to=\"test@localhost\"/>", ClientIQ{XMLName: xml.Name{Space: "", Local: "iq"}, Packet: Packet{To: "test@localhost", Type: "set", Id: "1"}}},
//{"<iq xmlns=\"jabber:client\" id=\"2\" type=\"set\" to=\"test@localhost\" from=\"server\"><set xmlns=\"urn:xmpp:iot:control\"/></iq>", ClientIQ{XMLName: xml.Name{Space: "jabber:client", Local: "iq"}, Packet: Packet{To: "test@localhost", From: "server", Type: "set", Id: "2"}, Payload: cs1}},
{"<iq id=\"1\" type=\"set\" to=\"test@localhost\"/>", IQ{XMLName: xml.Name{Space: "", Local: "iq"}, PacketAttrs: PacketAttrs{To: "test@localhost", Type: "set", Id: "1"}}},
//{"<iq xmlns=\"jabber:client\" id=\"2\" type=\"set\" to=\"test@localhost\" from=\"server\"><set xmlns=\"urn:xmpp:iot:control\"/></iq>", IQ{XMLName: xml.Name{Space: "jabber:client", Local: "iq"}, PacketAttrs: PacketAttrs{To: "test@localhost", From: "server", Type: "set", Id: "2"}, Payload: cs1}},
}
for _, test := range tests {
var parsedIQ = new(ClientIQ)
var parsedIQ = new(IQ)
err := xml.Unmarshal([]byte(test.iqString), parsedIQ)
if err != nil {
t.Errorf("Unmarshal(%s) returned error", test.iqString)

32
message.go
View File

@ -5,20 +5,36 @@ import (
"fmt"
)
// XMPP Packet Parsing
type ClientMessage struct {
XMLName xml.Name `xml:"jabber:client message"`
Packet
// ============================================================================
// Message Packet
type Message struct {
XMLName xml.Name `xml:"message"`
PacketAttrs
Subject string `xml:"subject,omitempty"`
Body string `xml:"body,omitempty"`
Thread string `xml:"thread,omitempty"`
}
// TODO: Func new message to create an empty message structure without the XML tag matching elements
func (Message) Name() string {
return "message"
}
func (message *ClientMessage) XMPPFormat() string {
type messageDecoder struct{}
var message messageDecoder
func (messageDecoder) decode(p *xml.Decoder, se xml.StartElement) (Message, error) {
var packet Message
err := p.DecodeElement(&packet, &se)
return packet, err
}
func (msg *Message) XMPPFormat() string {
return fmt.Sprintf("<message to='%s' type='chat' xml:lang='en'>"+
"<body>%s</body></message>",
message.To,
xmlEscape(message.Body))
msg.To,
xmlEscape(msg.Body))
}
// TODO: Func new message to create an empty message structure without the XML tag matching elements

13
ns.go
View File

@ -1,10 +1,11 @@
package xmpp // import "fluux.io/xmpp"
const (
NSStream = "http://etherx.jabber.org/streams"
nsTLS = "urn:ietf:params:xml:ns:xmpp-tls"
nsSASL = "urn:ietf:params:xml:ns:xmpp-sasl"
nsBind = "urn:ietf:params:xml:ns:xmpp-bind"
nsSession = "urn:ietf:params:xml:ns:xmpp-session"
NSClient = "jabber:client"
NSStream = "http://etherx.jabber.org/streams"
nsTLS = "urn:ietf:params:xml:ns:xmpp-tls"
nsSASL = "urn:ietf:params:xml:ns:xmpp-sasl"
nsBind = "urn:ietf:params:xml:ns:xmpp-bind"
nsSession = "urn:ietf:params:xml:ns:xmpp-session"
NSClient = "jabber:client"
NSComponent = "jabber:component:accept"
)

8
packet.go
View File

@ -1,7 +1,11 @@
package xmpp // import "fluux.io/xmpp"
// Packet represents the root default structure for an XMPP packet.
type Packet struct {
type Packet interface {
Name() string
}
// PacketAttrs represents the common structure for base XMPP packets.
type PacketAttrs struct {
Id string `xml:"id,attr,omitempty"`
From string `xml:"from,attr,omitempty"`
To string `xml:"to,attr,omitempty"`

95
parser.go
View File

@ -8,11 +8,12 @@ import (
)
// Reads and checks the opening XMPP stream element.
// It returns a stream structure containing:
// TODO It returns a stream structure containing:
// - Host: You can check the host against the host you were expecting to connect to
// - Id: the Stream ID is a temporary shared secret used for some hash calculation. It is also used by ProcessOne
// reattach features (allowing to resume an existing stream at the point the connection was interrupted, without
// getting through the authentication process.
// TODO We should handle stream error from XEP-0114 ( <conflict/> or <host-unknown/> )
func initDecoder(p *xml.Decoder) (sessionID string, err error) {
for {
var t xml.Token
@ -59,38 +60,76 @@ func nextStart(p *xml.Decoder) (xml.StartElement, error) {
panic("unreachable")
}
// Scan XML token stream for next element and save into val.
// If val == nil, allocate new element based on proto map.
// Either way, return val.
func next(p *xml.Decoder) (xml.Name, interface{}, error) {
// Read start element to find out what type we want.
// next scans XML token stream for next element and then assign a structure to decode
// that elements.
// TODO Use an interface to return packets interface xmppDecoder
func next(p *xml.Decoder) (Packet, error) {
// Read start element to find out how we want to parse the XMPP packet
se, err := nextStart(p)
if err != nil {
return xml.Name{}, nil, err
return nil, err
}
// Put it in an interface and allocate one.
var nv interface{}
switch se.Name.Space + " " + se.Name.Local {
// TODO: general case = Parse IQ / presence / message => split SASL case
case nsSASL + " success":
nv = &saslSuccess{}
case nsSASL + " failure":
nv = &saslFailure{}
case NSClient + " message":
nv = &ClientMessage{}
case NSClient + " presence":
nv = &ClientPresence{}
case NSClient + " iq":
nv = &ClientIQ{}
// TODO: general case = Parse IQ / presence / message => split SASL Stream and component cases
switch se.Name.Space {
case NSStream:
return decodeStream(p, se)
case nsSASL:
return decodeSASL(p, se)
case NSClient:
return decodeClient(p, se)
case NSComponent:
return decodeComponent(p, se)
default:
return xml.Name{}, nil, errors.New("unexpected XMPP message " +
return nil, errors.New("unknown namespace " +
se.Name.Space + " <" + se.Name.Local + "/>")
}
}
func decodeStream(p *xml.Decoder, se xml.StartElement) (Packet, error) {
switch se.Name.Local {
case "error":
return streamError.decode(p, se)
default:
return nil, errors.New("unexpected XMPP packet " +
se.Name.Space + " <" + se.Name.Local + "/>")
}
}
func decodeSASL(p *xml.Decoder, se xml.StartElement) (Packet, error) {
switch se.Name.Local {
case "success":
return saslSuccess.decode(p, se)
case "failure":
return saslFailure.decode(p, se)
default:
return nil, errors.New("unexpected XMPP packet " +
se.Name.Space + " <" + se.Name.Local + "/>")
}
}
func decodeClient(p *xml.Decoder, se xml.StartElement) (Packet, error) {
switch se.Name.Local {
case "message":
return message.decode(p, se)
case "presence":
return presence.decode(p, se)
case "iq":
return iq.decode(p, se)
default:
return nil, errors.New("unexpected XMPP packet " +
se.Name.Space + " <" + se.Name.Local + "/>")
}
}
func decodeComponent(p *xml.Decoder, se xml.StartElement) (Packet, error) {
switch se.Name.Local {
case "handshake":
return handshake.decode(p, se)
case "iq":
return iq.decode(p, se)
default:
return nil, errors.New("unexpected XMPP packet " +
se.Name.Space + " <" + se.Name.Local + "/>")
}
// Decode element into pointer storage
if err = p.DecodeElement(nv, &se); err != nil {
return xml.Name{}, nil, err
}
return se.Name, nv, err
}

8
pep/user_tune.go
View File

@ -7,9 +7,9 @@ import (
)
type iq struct {
XMLName xml.Name `xml:"jabber:client iq"`
C pubSub // c for "contains"
xmpp.Packet // Rename h for "header" ?
XMLName xml.Name `xml:"jabber:client iq"`
C pubSub // c for "contains"
xmpp.PacketAttrs // Rename h for "header" ?
}
type pubSub struct {
@ -68,7 +68,7 @@ type Tune struct {
*/
func (t *Tune) XMPPFormat() (s string) {
packet, _ := xml.Marshal(iq{Packet: xmpp.Packet{Id: "tunes", Type: "set"}, C: pubSub{Publish: publish{Node: "http://jabber.org/protocol/tune", Item: item{Tune: *t}}}})
packet, _ := xml.Marshal(iq{PacketAttrs: xmpp.PacketAttrs{Id: "tunes", Type: "set"}, C: pubSub{Publish: publish{Node: "http://jabber.org/protocol/tune", Item: item{Tune: *t}}}})
return string(packet)
}

24
presence.go
View File

@ -2,12 +2,28 @@ package xmpp // import "fluux.io/xmpp"
import "encoding/xml"
// XMPP Packet Parsing
type ClientPresence struct {
XMLName xml.Name `xml:"jabber:client presence"`
Packet
// ============================================================================
// Presence Packet
type Presence struct {
XMLName xml.Name `xml:"presence"`
PacketAttrs
Show string `xml:"show,attr,omitempty"` // away, chat, dnd, xa
Status string `xml:"status,attr,omitempty"`
Priority string `xml:"priority,attr,omitempty"`
//Error *clientError
}
func (Presence) Name() string {
return "presence"
}
type presenceDecoder struct{}
var presence presenceDecoder
func (presenceDecoder) decode(p *xml.Decoder, se xml.StartElement) (Presence, error) {
var packet Presence
err := p.DecodeElement(&packet, &se)
return packet, err
}

4
session.go
View File

@ -157,7 +157,7 @@ func (s *Session) bind(o Options) {
fmt.Fprintf(s.socketProxy, "<iq type='set' id='%s'><bind xmlns='%s'/></iq>", s.PacketId(), nsBind)
}
var iq ClientIQ
var iq IQ
if s.err = s.decoder.Decode(&iq); s.err != nil {
s.err = errors.New("error decoding iq bind result: " + s.err.Error())
return
@ -180,7 +180,7 @@ func (s *Session) rfc3921Session(o Options) {
return
}
var iq ClientIQ
var iq IQ
if s.Features.Session.optional.Local != "" {
fmt.Fprintf(s.socketProxy, "<iq type='set' id='%s'><session xmlns='%s'/></iq>", s.PacketId(), nsSession)
if s.err = s.decoder.Decode(&iq); s.err != nil {

33
stream.go
View File

@ -1,8 +1,12 @@
package xmpp // import "fluux.io/xmpp"
import "encoding/xml"
import (
"encoding/xml"
)
// ============================================================================
// StreamFeatures Packet
// XMPP Packet Parsing
type streamFeatures struct {
XMLName xml.Name `xml:"http://etherx.jabber.org/streams features"`
StartTLS tlsStartTLS
@ -13,6 +17,31 @@ type streamFeatures struct {
Any []xml.Name `xml:",any"`
}
// ============================================================================
// StreamError Packet
type StreamError struct {
XMLName xml.Name `xml:"http://etherx.jabber.org/streams error"`
Error xml.Name `xml:",any"`
}
func (StreamError) Name() string {
return "stream:error"
}
type streamErrorDecoder struct{}
var streamError streamErrorDecoder
func (streamErrorDecoder) decode(p *xml.Decoder, se xml.StartElement) (StreamError, error) {
var packet StreamError
err := p.DecodeElement(&packet, &se)
return packet, err
}
// ============================================================================
// Caps subElement
type Caps struct {
XMLName xml.Name `xml:"http://jabber.org/protocol/caps c"`
Hash string `xml:"hash,attr"`