xmpp: Add reply and stanza ID serialization/deserialization

This reverts commit f067814851.

README.md

@@ -3,4 +3,4 @@ go-xmpp
 
 go xmpp library (original was written by russ cox  )
 
-[Documentation](https://godoc.org/github.com/mattn/go-xmpp)
+[Documentation](https://godoc.org/github.com/xmppo/go-xmpp)

_example/example-gui.go

@@ -2,11 +2,12 @@ package main
 
 import (
 	"crypto/tls"
-	"github.com/mattn/go-gtk/gtk"
-	"github.com/mattn/go-xmpp"
 	"log"
 	"os"
 	"strings"
+
+	"github.com/matterbridge/go-xmpp"
+	"github.com/mattn/go-gtk/gtk"
 )
 
 func main() {

_example/example.go

@@ -5,20 +5,23 @@ import (
 	"crypto/tls"
 	"flag"
 	"fmt"
-	"github.com/mattn/go-xmpp"
 	"log"
 	"os"
 	"strings"
+
+	"github.com/matterbridge/go-xmpp"
 )
 
-var server = flag.String("server", "talk.google.com:443", "server")
-var username = flag.String("username", "", "username")
-var password = flag.String("password", "", "password")
-var status = flag.String("status", "xa", "status")
-var statusMessage = flag.String("status-msg", "I for one welcome our new codebot overlords.", "status message")
-var notls = flag.Bool("notls", false, "No TLS")
-var debug = flag.Bool("debug", false, "debug output")
-var session = flag.Bool("session", false, "use server session")
+var (
+	server        = flag.String("server", "talk.google.com:443", "server")
+	username      = flag.String("username", "", "username")
+	password      = flag.String("password", "", "password")
+	status        = flag.String("status", "xa", "status")
+	statusMessage = flag.String("status-msg", "I for one welcome our new codebot overlords.", "status message")
+	notls         = flag.Bool("notls", false, "No TLS")
+	debug         = flag.Bool("debug", false, "debug output")
+	session       = flag.Bool("session", false, "use server session")
+)
 
 func serverName(host string) string {
 	return strings.Split(host, ":")[0]
@@ -48,7 +51,8 @@ func main() {
 
 	var talk *xmpp.Client
 	var err error
-	options := xmpp.Options{Host: *server,
+	options := xmpp.Options{
+		Host:          *server,
 		User:          *username,
 		Password:      *password,
 		NoTLS:         *notls,
@@ -59,7 +63,6 @@ func main() {
 	}
 
 	talk, err = options.NewClient()
-
 	if err != nil {
 		log.Fatal(err)
 	}

go.mod

@@ -0,0 +1,8 @@
+module github.com/matterbridge/go-xmpp
+
+go 1.21.5
+
+require (
+	golang.org/x/crypto v0.23.0
+	golang.org/x/net v0.25.0
+)

go.sum

@@ -0,0 +1,4 @@
+golang.org/x/crypto v0.23.0 h1:dIJU/v2J8Mdglj/8rJ6UUOM3Zc9zLZxVZwwxMooUSAI=
+golang.org/x/crypto v0.23.0/go.mod h1:CKFgDieR+mRhux2Lsu27y0fO304Db0wZe70UKqHu0v8=
+golang.org/x/net v0.25.0 h1:d/OCCoBEUq33pjydKrGQhw7IlUPI2Oylr+8qLx49kac=
+golang.org/x/net v0.25.0/go.mod h1:JkAGAh7GEvH74S6FOH42FLoXpXbE/aqXSrIQjXgsiwM=

xmpp_avatar.go

@@ -0,0 +1,125 @@
+package xmpp
+
+import (
+	"crypto/sha1"
+	"encoding/base64"
+	"encoding/hex"
+	"encoding/xml"
+	"errors"
+	"strconv"
+)
+
+const (
+	XMPPNS_AVATAR_PEP_DATA     = "urn:xmpp:avatar:data"
+	XMPPNS_AVATAR_PEP_METADATA = "urn:xmpp:avatar:metadata"
+)
+
+type clientAvatarData struct {
+	XMLName xml.Name `xml:"data"`
+	Data    []byte   `xml:",innerxml"`
+}
+
+type clientAvatarInfo struct {
+	XMLName xml.Name `xml:"info"`
+	Bytes   string   `xml:"bytes,attr"`
+	Width   string   `xml:"width,attr"`
+	Height  string   `xml:"height,attr"`
+	ID      string   `xml:"id,attr"`
+	Type    string   `xml:"type,attr"`
+	URL     string   `xml:"url,attr"`
+}
+
+type clientAvatarMetadata struct {
+	XMLName xml.Name         `xml:"metadata"`
+	XMLNS   string           `xml:"xmlns,attr"`
+	Info    clientAvatarInfo `xml:"info"`
+}
+
+type AvatarData struct {
+	Data []byte
+	From string
+}
+
+type AvatarMetadata struct {
+	From   string
+	Bytes  int
+	Width  int
+	Height int
+	ID     string
+	Type   string
+	URL    string
+}
+
+func handleAvatarData(itemsBody []byte, from, id string) (AvatarData, error) {
+	var data clientAvatarData
+	err := xml.Unmarshal(itemsBody, &data)
+	if err != nil {
+		return AvatarData{}, err
+	}
+
+	// Base64-decode the avatar data to check its SHA1 hash
+	dataRaw, err := base64.StdEncoding.DecodeString(
+		string(data.Data))
+	if err != nil {
+		return AvatarData{}, err
+	}
+
+	hash := sha1.Sum(dataRaw)
+	hashStr := hex.EncodeToString(hash[:])
+	if hashStr != id {
+		return AvatarData{}, errors.New("SHA1 hashes do not match")
+	}
+
+	return AvatarData{
+		Data: dataRaw,
+		From: from,
+	}, nil
+}
+
+func handleAvatarMetadata(body []byte, from string) (AvatarMetadata, error) {
+	var meta clientAvatarMetadata
+	err := xml.Unmarshal(body, &meta)
+	if err != nil {
+		return AvatarMetadata{}, err
+	}
+
+	return AvatarMetadata{
+		From:   from,
+		Bytes:  atoiw(meta.Info.Bytes),
+		Width:  atoiw(meta.Info.Width),
+		Height: atoiw(meta.Info.Height),
+		ID:     meta.Info.ID,
+		Type:   meta.Info.Type,
+		URL:    meta.Info.URL,
+	}, nil
+}
+
+// A wrapper for atoi which just returns -1 if an error occurs
+func atoiw(str string) int {
+	i, err := strconv.Atoi(str)
+	if err != nil {
+		return -1
+	}
+
+	return i
+}
+
+func (c *Client) AvatarSubscribeMetadata(jid string) {
+	c.PubsubSubscribeNode(XMPPNS_AVATAR_PEP_METADATA, jid)
+}
+
+func (c *Client) AvatarUnsubscribeMetadata(jid string) {
+	c.PubsubUnsubscribeNode(XMPPNS_AVATAR_PEP_METADATA, jid)
+}
+
+func (c *Client) AvatarRequestData(jid string) {
+	c.PubsubRequestLastItems(XMPPNS_AVATAR_PEP_DATA, jid)
+}
+
+func (c *Client) AvatarRequestDataByID(jid, id string) {
+	c.PubsubRequestItem(XMPPNS_AVATAR_PEP_DATA, jid, id)
+}
+
+func (c *Client) AvatarRequestMetadata(jid string) {
+	c.PubsubRequestLastItems(XMPPNS_AVATAR_PEP_METADATA, jid)
+}

xmpp_disco.go

@@ -0,0 +1,99 @@
+package xmpp
+
+import (
+	"encoding/xml"
+)
+
+const (
+	XMPPNS_DISCO_ITEMS = "http://jabber.org/protocol/disco#items"
+	XMPPNS_DISCO_INFO  = "http://jabber.org/protocol/disco#info"
+)
+
+type clientDiscoFeature struct {
+	XMLName xml.Name `xml:"feature"`
+	Var     string   `xml:"var,attr"`
+}
+
+type clientDiscoIdentity struct {
+	XMLName  xml.Name `xml:"identity"`
+	Category string   `xml:"category,attr"`
+	Type     string   `xml:"type,attr"`
+	Name     string   `xml:"name,attr"`
+}
+
+type clientDiscoQuery struct {
+	XMLName    xml.Name              `xml:"query"`
+	Features   []clientDiscoFeature  `xml:"feature"`
+	Identities []clientDiscoIdentity `xml:"identity"`
+}
+
+type clientDiscoItem struct {
+	XMLName xml.Name `xml:"item"`
+	Jid     string   `xml:"jid,attr"`
+	Node    string   `xml:"node,attr"`
+	Name    string   `xml:"name,attr"`
+}
+
+type clientDiscoItemsQuery struct {
+	XMLName xml.Name          `xml:"query"`
+	Items   []clientDiscoItem `xml:"item"`
+}
+
+type DiscoIdentity struct {
+	Category string
+	Type     string
+	Name     string
+}
+
+type DiscoItem struct {
+	Jid  string
+	Name string
+	Node string
+}
+
+type DiscoResult struct {
+	Features   []string
+	Identities []DiscoIdentity
+}
+
+type DiscoItems struct {
+	Jid   string
+	Items []DiscoItem
+}
+
+func clientFeaturesToReturn(features []clientDiscoFeature) []string {
+	var ret []string
+
+	for _, feature := range features {
+		ret = append(ret, feature.Var)
+	}
+
+	return ret
+}
+
+func clientIdentitiesToReturn(identities []clientDiscoIdentity) []DiscoIdentity {
+	var ret []DiscoIdentity
+
+	for _, id := range identities {
+		ret = append(ret, DiscoIdentity{
+			Category: id.Category,
+			Type:     id.Type,
+			Name:     id.Name,
+		})
+	}
+
+	return ret
+}
+
+func clientDiscoItemsToReturn(items []clientDiscoItem) []DiscoItem {
+	var ret []DiscoItem
+	for _, item := range items {
+		ret = append(ret, DiscoItem{
+			Jid:  item.Jid,
+			Name: item.Name,
+			Node: item.Node,
+		})
+	}
+
+	return ret
+}

xmpp_information_query.go

@@ -5,27 +5,45 @@ import (
 	"strconv"
 )
 
-const IQTypeGet = "get"
-const IQTypeSet = "set"
-const IQTypeResult = "result"
+const (
+	IQTypeGet    = "get"
+	IQTypeSet    = "set"
+	IQTypeResult = "result"
+)
 
 func (c *Client) Discovery() (string, error) {
-	const namespace = "http://jabber.org/protocol/disco#items"
-	// use getCookie for a pseudo random id.
+	// use UUIDv4 for a pseudo random id.
 	reqID := strconv.FormatUint(uint64(getCookie()), 10)
-	return c.RawInformationQuery(c.jid, c.domain, reqID, IQTypeGet, namespace, "")
+	return c.RawInformationQuery(c.jid, c.domain, reqID, IQTypeGet, XMPPNS_DISCO_ITEMS, "")
+}
+
+// Discover information about a node
+func (c *Client) DiscoverNodeInfo(node string) (string, error) {
+	query := fmt.Sprintf("<query xmlns='%s' node='%s'/>", XMPPNS_DISCO_INFO, node)
+	return c.RawInformation(c.jid, c.domain, "info3", IQTypeGet, query)
+}
+
+// Discover items that the server exposes
+func (c *Client) DiscoverServerItems() (string, error) {
+	return c.DiscoverEntityItems(c.domain)
+}
+
+// Discover items that an entity exposes
+func (c *Client) DiscoverEntityItems(jid string) (string, error) {
+	query := fmt.Sprintf("<query xmlns='%s'/>", XMPPNS_DISCO_ITEMS)
+	return c.RawInformation(c.jid, jid, "info1", IQTypeGet, query)
 }
 
 // RawInformationQuery sends an information query request to the server.
 func (c *Client) RawInformationQuery(from, to, id, iqType, requestNamespace, body string) (string, error) {
-	const xmlIQ = "<iq from='%s' to='%s' id='%s' type='%s'><query xmlns='%s'>%s</query></iq>"
-	_, err := fmt.Fprintf(c.conn, xmlIQ, xmlEscape(from), xmlEscape(to), id, iqType, requestNamespace, body)
+	const xmlIQ = "<iq from='%s' to='%s' id='%s' type='%s'><query xmlns='%s'>%s</query></iq>\n"
+	_, err := fmt.Fprintf(c.stanzaWriter, xmlIQ, xmlEscape(from), xmlEscape(to), id, iqType, requestNamespace, body)
 	return id, err
 }
 
-// rawInformation send a IQ request with the the payload body to the server
+// rawInformation send a IQ request with the payload body to the server
 func (c *Client) RawInformation(from, to, id, iqType, body string) (string, error) {
-	const xmlIQ = "<iq from='%s' to='%s' id='%s' type='%s'>%s</iq>"
-	_, err := fmt.Fprintf(c.conn, xmlIQ, xmlEscape(from), xmlEscape(to), id, iqType, body)
+	const xmlIQ = "<iq from='%s' to='%s' id='%s' type='%s'>%s</iq>\n"
+	_, err := fmt.Fprintf(c.stanzaWriter, xmlIQ, xmlEscape(from), xmlEscape(to), id, iqType, body)
 	return id, err
 }

xmpp_muc.go

@@ -8,9 +8,9 @@
 package xmpp
 
 import (
+	"errors"
 	"fmt"
 	"time"
-	"errors"
 )
 
 const (
@@ -25,7 +25,7 @@ const (
 
 // Send sends room topic wrapped inside an XMPP message stanza body.
 func (c *Client) SendTopic(chat Chat) (n int, err error) {
-	return fmt.Fprintf(c.conn, "<message to='%s' type='%s' xml:lang='en'>"+"<subject>%s</subject></message>",
+	return fmt.Fprintf(c.stanzaWriter, "<message to='%s' type='%s' xml:lang='en'>"+"<subject>%s</subject></message>\n",
 		xmlEscape(chat.Remote), xmlEscape(chat.Type), xmlEscape(chat.Text))
 }
 
@@ -33,10 +33,10 @@ func (c *Client) JoinMUCNoHistory(jid, nick string) (n int, err error) {
 	if nick == "" {
 		nick = c.jid
 	}
-	return fmt.Fprintf(c.conn, "<presence to='%s/%s'>\n"+
+	return fmt.Fprintf(c.stanzaWriter, "<presence to='%s/%s'>"+
 		"<x xmlns='%s'>"+
-		"<history maxchars='0'/></x>\n"+
-		"</presence>",
+		"<history maxchars='0'/></x>"+
+		"</presence>\n",
 		xmlEscape(jid), xmlEscape(nick), nsMUC)
 }
 
@@ -47,34 +47,34 @@ func (c *Client) JoinMUC(jid, nick string, history_type, history int, history_da
 	}
 	switch history_type {
 	case NoHistory:
-		return fmt.Fprintf(c.conn, "<presence to='%s/%s'>\n" +
-			"<x xmlns='%s' />\n" +
-			"</presence>",
+		return fmt.Fprintf(c.stanzaWriter, "<presence to='%s/%s'>"+
+			"<x xmlns='%s' />"+
+			"</presence>\n",
 			xmlEscape(jid), xmlEscape(nick), nsMUC)
 	case CharHistory:
-		return fmt.Fprintf(c.conn, "<presence to='%s/%s'>\n" +
-			"<x xmlns='%s'>\n" +
-			"<history maxchars='%d'/></x>\n"+
-			"</presence>",
+		return fmt.Fprintf(c.stanzaWriter, "<presence to='%s/%s'>"+
+			"<x xmlns='%s'>"+
+			"<history maxchars='%d'/></x>"+
+			"</presence>\n",
 			xmlEscape(jid), xmlEscape(nick), nsMUC, history)
 	case StanzaHistory:
-		return fmt.Fprintf(c.conn, "<presence to='%s/%s'>\n" +
-			"<x xmlns='%s'>\n" +
-			"<history maxstanzas='%d'/></x>\n"+
-			"</presence>",
+		return fmt.Fprintf(c.stanzaWriter, "<presence to='%s/%s'>"+
+			"<x xmlns='%s'>"+
+			"<history maxstanzas='%d'/></x>"+
+			"</presence>\n",
 			xmlEscape(jid), xmlEscape(nick), nsMUC, history)
 	case SecondsHistory:
-		return fmt.Fprintf(c.conn, "<presence to='%s/%s'>\n" +
-			"<x xmlns='%s'>\n" +
-			"<history seconds='%d'/></x>\n"+
-			"</presence>",
+		return fmt.Fprintf(c.stanzaWriter, "<presence to='%s/%s'>"+
+			"<x xmlns='%s'>"+
+			"<history seconds='%d'/></x>"+
+			"</presence>\n",
 			xmlEscape(jid), xmlEscape(nick), nsMUC, history)
 	case SinceHistory:
 		if history_date != nil {
-			return fmt.Fprintf(c.conn, "<presence to='%s/%s'>\n" +
-				"<x xmlns='%s'>\n" +
-				"<history since='%s'/></x>\n" +
-				"</presence>",
+			return fmt.Fprintf(c.stanzaWriter, "<presence to='%s/%s'>"+
+				"<x xmlns='%s'>"+
+				"<history since='%s'/></x>"+
+				"</presence>\n",
 				xmlEscape(jid), xmlEscape(nick), nsMUC, history_date.Format(time.RFC3339))
 		}
 	}
@@ -88,40 +88,40 @@ func (c *Client) JoinProtectedMUC(jid, nick string, password string, history_typ
 	}
 	switch history_type {
 	case NoHistory:
-		return fmt.Fprintf(c.conn, "<presence to='%s/%s'>\n" +
-			"<x xmlns='%s'>\n" +
-			"<password>%s</password>" +
-			"</x>\n" +
-			"</presence>",
+		return fmt.Fprintf(c.stanzaWriter, "<presence to='%s/%s'>"+
+			"<x xmlns='%s'>"+
+			"<password>%s</password>"+
+			"</x>"+
+			"</presence>\n",
 			xmlEscape(jid), xmlEscape(nick), nsMUC, xmlEscape(password))
 	case CharHistory:
-		return fmt.Fprintf(c.conn, "<presence to='%s/%s'>\n" +
-			"<x xmlns='%s'>\n" +
-			"<password>%s</password>\n"+
-			"<history maxchars='%d'/></x>\n"+
-			"</presence>",
+		return fmt.Fprintf(c.stanzaWriter, "<presence to='%s/%s'>"+
+			"<x xmlns='%s'>"+
+			"<password>%s</password>"+
+			"<history maxchars='%d'/></x>"+
+			"</presence>\n",
 			xmlEscape(jid), xmlEscape(nick), nsMUC, xmlEscape(password), history)
 	case StanzaHistory:
-		return fmt.Fprintf(c.conn, "<presence to='%s/%s'>\n" +
-			"<x xmlns='%s'>\n" +
-			"<password>%s</password>\n"+
-			"<history maxstanzas='%d'/></x>\n"+
-			"</presence>",
+		return fmt.Fprintf(c.stanzaWriter, "<presence to='%s/%s'>"+
+			"<x xmlns='%s'>"+
+			"<password>%s</password>"+
+			"<history maxstanzas='%d'/></x>"+
+			"</presence>\n",
 			xmlEscape(jid), xmlEscape(nick), nsMUC, xmlEscape(password), history)
 	case SecondsHistory:
-		return fmt.Fprintf(c.conn, "<presence to='%s/%s'>\n" +
-			"<x xmlns='%s'>\n" +
-			"<password>%s</password>\n"+
-			"<history seconds='%d'/></x>\n"+
-			"</presence>",
+		return fmt.Fprintf(c.stanzaWriter, "<presence to='%s/%s'>"+
+			"<x xmlns='%s'>"+
+			"<password>%s</password>"+
+			"<history seconds='%d'/></x>"+
+			"</presence>\n",
 			xmlEscape(jid), xmlEscape(nick), nsMUC, xmlEscape(password), history)
 	case SinceHistory:
 		if history_date != nil {
-			return fmt.Fprintf(c.conn, "<presence to='%s/%s'>\n" +
-				"<x xmlns='%s'>\n" +
-				"<password>%s</password>\n"+
-				"<history since='%s'/></x>\n" +
-				"</presence>",
+			return fmt.Fprintf(c.stanzaWriter, "<presence to='%s/%s'>"+
+				"<x xmlns='%s'>"+
+				"<password>%s</password>"+
+				"<history since='%s'/></x>"+
+				"</presence>\n",
 				xmlEscape(jid), xmlEscape(nick), nsMUC, xmlEscape(password), history_date.Format(time.RFC3339))
 		}
 	}
@@ -130,6 +130,6 @@ func (c *Client) JoinProtectedMUC(jid, nick string, password string, history_typ
 
 // xep-0045 7.14
 func (c *Client) LeaveMUC(jid string) (n int, err error) {
-	return fmt.Fprintf(c.conn, "<presence from='%s' to='%s' type='unavailable' />",
+	return fmt.Fprintf(c.stanzaWriter, "<presence from='%s' to='%s' type='unavailable' />\n",
 		c.jid, xmlEscape(jid))
 }

xmpp_ping.go

@@ -11,23 +11,23 @@ func (c *Client) PingC2S(jid, server string) error {
 	if server == "" {
 		server = c.domain
 	}
-	_, err := fmt.Fprintf(c.conn, "<iq from='%s' to='%s' id='c2s1' type='get'>\n"+
-		"<ping xmlns='urn:xmpp:ping'/>\n"+
-		"</iq>",
+	_, err := fmt.Fprintf(c.stanzaWriter, "<iq from='%s' to='%s' id='c2s1' type='get'>"+
+		"<ping xmlns='urn:xmpp:ping'/>"+
+		"</iq>\n",
 		xmlEscape(jid), xmlEscape(server))
 	return err
 }
 
 func (c *Client) PingS2S(fromServer, toServer string) error {
-	_, err := fmt.Fprintf(c.conn, "<iq from='%s' to='%s' id='s2s1' type='get'>\n"+
-		"<ping xmlns='urn:xmpp:ping'/>\n"+
-		"</iq>",
+	_, err := fmt.Fprintf(c.stanzaWriter, "<iq from='%s' to='%s' id='s2s1' type='get'>"+
+		"<ping xmlns='urn:xmpp:ping'/>"+
+		"</iq>\n",
 		xmlEscape(fromServer), xmlEscape(toServer))
 	return err
 }
 
 func (c *Client) SendResultPing(id, toServer string) error {
-	_, err := fmt.Fprintf(c.conn, "<iq type='result' to='%s' id='%s'/>",
+	_, err := fmt.Fprintf(c.stanzaWriter, "<iq type='result' to='%s' id='%s'/>\n",
 		xmlEscape(toServer), xmlEscape(id))
 	return err
 }

xmpp_pubsub.go

@@ -0,0 +1,128 @@
+package xmpp
+
+import (
+	"encoding/xml"
+	"fmt"
+)
+
+const (
+	XMPPNS_PUBSUB       = "http://jabber.org/protocol/pubsub"
+	XMPPNS_PUBSUB_EVENT = "http://jabber.org/protocol/pubsub#event"
+)
+
+type clientPubsubItem struct {
+	XMLName xml.Name `xml:"item"`
+	ID      string   `xml:"id,attr"`
+	Body    []byte   `xml:",innerxml"`
+}
+
+type clientPubsubItems struct {
+	XMLName xml.Name           `xml:"items"`
+	Node    string             `xml:"node,attr"`
+	Items   []clientPubsubItem `xml:"item"`
+}
+
+type clientPubsubEvent struct {
+	XMLName xml.Name          `xml:"event"`
+	XMLNS   string            `xml:"xmlns,attr"`
+	Items   clientPubsubItems `xml:"items"`
+}
+
+type clientPubsubError struct {
+	XMLName xml.Name
+}
+
+type clientPubsubSubscription struct {
+	XMLName xml.Name `xml:"subscription"`
+	Node    string   `xml:"node,attr"`
+	JID     string   `xml:"jid,attr"`
+	SubID   string   `xml:"subid,attr"`
+}
+
+type PubsubEvent struct {
+	Node  string
+	Items []PubsubItem
+}
+
+type PubsubSubscription struct {
+	SubID  string
+	JID    string
+	Node   string
+	Errors []string
+}
+type PubsubUnsubscription PubsubSubscription
+
+type PubsubItem struct {
+	ID       string
+	InnerXML []byte
+}
+
+type PubsubItems struct {
+	Node  string
+	Items []PubsubItem
+}
+
+// Converts []clientPubsubItem to []PubsubItem
+func pubsubItemsToReturn(items []clientPubsubItem) []PubsubItem {
+	var tmp []PubsubItem
+	for _, i := range items {
+		tmp = append(tmp, PubsubItem{
+			ID:       i.ID,
+			InnerXML: i.Body,
+		})
+	}
+
+	return tmp
+}
+
+func pubsubClientToReturn(event clientPubsubEvent) PubsubEvent {
+	return PubsubEvent{
+		Node:  event.Items.Node,
+		Items: pubsubItemsToReturn(event.Items.Items),
+	}
+}
+
+func pubsubStanza(body string) string {
+	return fmt.Sprintf("<pubsub xmlns='%s'>%s</pubsub>",
+		XMPPNS_PUBSUB, body)
+}
+
+func pubsubSubscriptionStanza(node, jid string) string {
+	body := fmt.Sprintf("<subscribe node='%s' jid='%s'/>",
+		xmlEscape(node),
+		xmlEscape(jid))
+	return pubsubStanza(body)
+}
+
+func pubsubUnsubscriptionStanza(node, jid string) string {
+	body := fmt.Sprintf("<unsubscribe node='%s' jid='%s'/>",
+		xmlEscape(node),
+		xmlEscape(jid))
+	return pubsubStanza(body)
+}
+
+func (c *Client) PubsubSubscribeNode(node, jid string) {
+	c.RawInformation(c.jid,
+		jid,
+		"sub1",
+		"set",
+		pubsubSubscriptionStanza(node, c.jid))
+}
+
+func (c *Client) PubsubUnsubscribeNode(node, jid string) {
+	c.RawInformation(c.jid,
+		jid,
+		"unsub1",
+		"set",
+		pubsubUnsubscriptionStanza(node, c.jid))
+}
+
+func (c *Client) PubsubRequestLastItems(node, jid string) {
+	body := fmt.Sprintf("<items node='%s'/>", node)
+	c.RawInformation(c.jid, jid, "items1", "get", pubsubStanza(body))
+}
+
+func (c *Client) PubsubRequestItem(node, jid, id string) {
+	body := fmt.Sprintf("<items node='%s'><item id='%s'/></items>", node, id)
+	c.RawInformation(c.jid, jid, "items3", "get", pubsubStanza(body))
+}

xmpp_subscription.go

@@ -5,16 +5,21 @@ import (
 )
 
 func (c *Client) ApproveSubscription(jid string) {
-	fmt.Fprintf(c.conn, "<presence to='%s' type='subscribed'/>",
+	fmt.Fprintf(c.stanzaWriter, "<presence to='%s' type='subscribed'/>\n",
 		xmlEscape(jid))
 }
 
 func (c *Client) RevokeSubscription(jid string) {
-	fmt.Fprintf(c.conn, "<presence to='%s' type='unsubscribed'/>",
+	fmt.Fprintf(c.stanzaWriter, "<presence to='%s' type='unsubscribed'/>\n",
+		xmlEscape(jid))
+}
+
+func (c *Client) RetrieveSubscription(jid string) {
+	fmt.Fprintf(c.conn, "<presence to='%s' type='unsubscribe'/>\n",
 		xmlEscape(jid))
 }
 
 func (c *Client) RequestSubscription(jid string) {
-	fmt.Fprintf(c.conn, "<presence to='%s' type='subscribe'/>",
+	fmt.Fprintf(c.stanzaWriter, "<presence to='%s' type='subscribe'/>\n",
 		xmlEscape(jid))
 }

xmpp_test.go

@@ -85,12 +85,14 @@ func TestStanzaError(t *testing.T) {
 			"\n\t\t\n\t\t\n\t",
 		},
 		OtherElem: []XMLElement{
-			XMLElement{
+			{
 				XMLName:  xml.Name{Space: "google:mobile:data", Local: "gcm"},
+				Attr:     []xml.Attr{{Name: xml.Name{Space: "", Local: "xmlns"}, Value: "google:mobile:data"}},
 				InnerXML: "\n\t\t{\"random\": \"<text>\"}\n\t",
 			},
-			XMLElement{
+			{
 				XMLName: xml.Name{Space: "jabber:client", Local: "error"},
+				Attr:    []xml.Attr{{Name: xml.Name{Space: "", Local: "code"}, Value: "400"}, {Name: xml.Name{Space: "", Local: "type"}, Value: "modify"}},
 				InnerXML: `
 		<bad-request xmlns="urn:ietf:params:xml:ns:xmpp-stanzas"/>
 		<text xmlns="urn:ietf:params:xml:ns:xmpp-stanzas">
@@ -114,3 +116,28 @@ func TestEOFError(t *testing.T) {
 		t.Errorf("Recv() did not return io.EOF on end of input stream")
 	}
 }
+
+var emptyPubSub = strings.TrimSpace(`
+<iq xmlns="jabber:client" type='result' from='juliet@capulet.lit' id='items3'>
+  <pubsub xmlns='http://jabber.org/protocol/pubsub'>
+    <items node='urn:xmpp:avatar:data'></items>
+  </pubsub>
+</iq>
+`)
+
+func TestEmptyPubsub(t *testing.T) {
+	var c Client
+	c.conn = tConnect(emptyPubSub)
+	c.p = xml.NewDecoder(c.conn)
+	m, err := c.Recv()
+
+	switch m.(type) {
+	case AvatarData:
+		if err == nil {
+			t.Errorf("Expected an error to be returned")
+		}
+	default:
+		t.Errorf("Recv() = %v", m)
+		t.Errorf("Expected a return value of AvatarData")
+	}
+}