[WIP] Fix ban by software version, some other under-hood changes

- Use updated version of upstream go-xmpp + fixes on client-side
- Still waiting for https://github.com/xmppo/go-xmpp/pull/215
- Introduce golangci-lint v2 + fixes

vendor/github.com/xmppo/go-xmpp/.travis.yml

@@ -0,0 +1,5 @@
+language: go
+go:
+  - tip
+script:
+    - go test

vendor/github.com/xmppo/go-xmpp/LICENSE

@@ -0,0 +1,27 @@
+Copyright (c) 2009 The Go Authors. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+   * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+   * Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer
+in the documentation and/or other materials provided with the
+distribution.
+   * Neither the name of Google Inc. nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

vendor/github.com/xmppo/go-xmpp/README.md

@@ -0,0 +1,6 @@
+go-xmpp
+=======
+
+go xmpp library (original was written by russ cox  )
+
+[Documentation](https://godoc.org/github.com/xmppo/go-xmpp)

vendor/github.com/xmppo/go-xmpp/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) error {
+	return c.PubsubSubscribeNode(XMPPNS_AVATAR_PEP_METADATA, jid)
+}
+
+func (c *Client) AvatarUnsubscribeMetadata(jid string) error {
+	return c.PubsubUnsubscribeNode(XMPPNS_AVATAR_PEP_METADATA, jid)
+}
+
+func (c *Client) AvatarRequestData(jid string) error {
+	return c.PubsubRequestLastItems(XMPPNS_AVATAR_PEP_DATA, jid)
+}
+
+func (c *Client) AvatarRequestDataByID(jid, id string) error {
+	return c.PubsubRequestItem(XMPPNS_AVATAR_PEP_DATA, jid, id)
+}
+
+func (c *Client) AvatarRequestMetadata(jid string) error {
+	return c.PubsubRequestLastItems(XMPPNS_AVATAR_PEP_METADATA, jid)
+}

vendor/github.com/xmppo/go-xmpp/xmpp_disco.go

@@ -0,0 +1,115 @@
+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"`
+	X          []DiscoX              `xml:"x"`
+}
+
+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 {
+	ID         string
+	From       string
+	To         string
+	Features   []string
+	Identities []DiscoIdentity
+	X          []DiscoX
+}
+
+type DiscoX struct {
+	XMLName xml.Name      `xml:"x"`
+	Field   []DiscoXField `xml:"field"`
+}
+
+type DiscoXField struct {
+	Type  string   `xml:"type,attr"`
+	Var   string   `xml:"var,attr"`
+	Value []string `xml:"value"`
+}
+
+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
+}

vendor/github.com/xmppo/go-xmpp/xmpp_error.go

@@ -0,0 +1,57 @@
+package xmpp
+
+import (
+	"fmt"
+)
+
+// ErrorServiceUnavailable implements error response about a feature that is not available. Currently implemented for
+// xep-0030.
+// QueryXmlns is about incoming xmlns attribute in query tag.
+// Node is about incoming node attribute in query tag (looks like it used only in disco#commands).
+//
+// If queried feature is not here on purpose, standards suggest to answer with this stanza.
+func (c *Client) ErrorServiceUnavailable(v IQ, queryXmlns, node string) (string, error) {
+	query := fmt.Sprintf("<query xmlns='%s' ", queryXmlns)
+
+	if node != "" {
+		query += fmt.Sprintf("node='%s' />", node)
+	} else {
+		query += "/>"
+	}
+
+	query += "<error type='cancel'>"
+	query += "<service-unavailable xmlns='urn:ietf:params:xml:ns:xmpp-stanzas' />"
+	query += "</error>"
+
+	return c.RawInformation(
+		v.To,
+		v.From,
+		v.ID,
+		IQTypeError,
+		query,
+	)
+}
+
+// ErrorNotImplemented implements error response about a feature that is not (yet?) implemented.
+// Xmlns is about not implemented feature.
+//
+// If queried feature is not here because of it under development or for similar reasons, standards suggest to answer with
+// this stanza.
+func (c *Client) ErrorNotImplemented(v IQ, xmlns, feature string) (string, error) {
+	query := "<error type='cancel'>"
+	query += "<feature-not-implemented xmlns='urn:ietf:params:xml:ns:xmpp-stanzas' />"
+	query += fmt.Sprintf(
+		"<unsupported xmlns='%s' feature='%s' />",
+		xmlns,
+		feature,
+	)
+	query += "</error>"
+
+	return c.RawInformation(
+		v.To,
+		v.From,
+		v.ID,
+		IQTypeError,
+		query,
+	)
+}

vendor/github.com/xmppo/go-xmpp/xmpp_information_query.go

@@ -0,0 +1,104 @@
+package xmpp
+
+import (
+	"fmt"
+	"time"
+)
+
+const (
+	IQTypeGet    = "get"
+	IQTypeSet    = "set"
+	IQTypeResult = "result"
+	IQTypeError  = "error"
+)
+
+func (c *Client) Discovery() (string, error) {
+	// use UUIDv4 for a pseudo random id.
+	reqID := getUUID()
+	return c.RawInformationQuery(c.jid, c.domain, reqID, IQTypeGet, XMPPNS_DISCO_ITEMS, "")
+}
+
+// Discover information about a node. Empty node queries info about server itself.
+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, getUUID(), IQTypeGet, query)
+}
+
+// Discover information about given item from given jid.
+func (c *Client) DiscoverInfo(to string) (string, error) {
+	query := fmt.Sprintf("<query xmlns='%s'/>", XMPPNS_DISCO_INFO)
+	return c.RawInformation(c.jid, to, getUUID(), 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, getUUID(), 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>\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 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>\n"
+	_, err := fmt.Fprintf(c.stanzaWriter, xmlIQ, xmlEscape(from), xmlEscape(to), id, iqType, body)
+	return id, err
+}
+
+// UrnXMPPTimeResponse implements response to query entity's current time (xep-0202).
+func (c *Client) UrnXMPPTimeResponse(v IQ, timezoneOffset string) (string, error) {
+	query := fmt.Sprintf(
+		"<time xmlns=\"%s\"><tzo>%s</tzo><utc>%s</utc></time>",
+		nsTime,
+		timezoneOffset,
+		time.Now().UTC().Format(time.RFC3339),
+	)
+
+	return c.RawInformation(
+		v.To,
+		v.From,
+		v.ID,
+		IQTypeResult,
+		query,
+	)
+}
+
+// IqVersionResponse responding with software version, according to xep-0092.
+func (c *Client) IqVersionResponse(v IQ, name string, version string, os string) (string, error) {
+	if name == "" {
+		name = "go-xmpp"
+		version = Version
+	}
+
+	if version == "" {
+		version = "undefined"
+	}
+
+	query := fmt.Sprintf("<query xmlns=\"%s\">", nsVersion)
+	query += fmt.Sprintf("<name>%s</name>", name)
+	query += fmt.Sprintf("<version>%s</version>", version)
+
+	if os != "" {
+		query += fmt.Sprintf("<os>%s</os>", os)
+	}
+
+	query += "</query>"
+
+	return c.RawInformation(
+		v.To,
+		v.From,
+		v.ID,
+		IQTypeResult,
+		query,
+	)
+}

vendor/github.com/xmppo/go-xmpp/xmpp_muc.go

@@ -0,0 +1,135 @@
+// Copyright 2013 Flo Lauber <dev@qatfy.at>.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// TODO(flo):
+//   - support password protected MUC rooms
+//   - cleanup signatures of join/leave functions
+package xmpp
+
+import (
+	"errors"
+	"fmt"
+	"time"
+)
+
+const (
+	nsMUC          = "http://jabber.org/protocol/muc"
+	nsMUCUser      = "http://jabber.org/protocol/muc#user"
+	NoHistory      = 0
+	CharHistory    = 1
+	StanzaHistory  = 2
+	SecondsHistory = 3
+	SinceHistory   = 4
+)
+
+// 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.stanzaWriter, "<message to='%s' type='%s' xml:lang='en'>"+"<subject>%s</subject></message>\n",
+		xmlEscape(chat.Remote), xmlEscape(chat.Type), xmlEscape(chat.Text))
+}
+
+func (c *Client) JoinMUCNoHistory(jid, nick string) (n int, err error) {
+	if nick == "" {
+		nick = c.jid
+	}
+	return fmt.Fprintf(c.stanzaWriter, "<presence to='%s/%s'>"+
+		"<x xmlns='%s'>"+
+		"<history maxchars='0'/></x>"+
+		"</presence>\n",
+		xmlEscape(jid), xmlEscape(nick), nsMUC)
+}
+
+// xep-0045 7.2
+func (c *Client) JoinMUC(jid, nick string, history_type, history int, history_date *time.Time) (n int, err error) {
+	if nick == "" {
+		nick = c.jid
+	}
+	switch history_type {
+	case NoHistory:
+		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.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.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.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.stanzaWriter, "<presence to='%s/%s'>"+
+				"<x xmlns='%s'>"+
+				"<history since='%s'/></x>"+
+				"</presence>\n",
+				xmlEscape(jid), xmlEscape(nick), nsMUC, history_date.Format(time.RFC3339))
+		}
+	}
+	return 0, errors.New("unknown history option")
+}
+
+// xep-0045 7.2.6
+func (c *Client) JoinProtectedMUC(jid, nick string, password string, history_type, history int, history_date *time.Time) (n int, err error) {
+	if nick == "" {
+		nick = c.jid
+	}
+	switch history_type {
+	case NoHistory:
+		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.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.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.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.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))
+		}
+	}
+	return 0, errors.New("unknown history option")
+}
+
+// xep-0045 7.14
+func (c *Client) LeaveMUC(jid string) (n int, err error) {
+	return fmt.Fprintf(c.stanzaWriter, "<presence from='%s' to='%s' type='unavailable' />\n",
+		c.jid, xmlEscape(jid))
+}

vendor/github.com/xmppo/go-xmpp/xmpp_ping.go

@@ -0,0 +1,57 @@
+package xmpp
+
+import (
+	"fmt"
+	"time"
+)
+
+func (c *Client) PingC2S(jid, server string) error {
+	if jid == "" {
+		jid = c.jid
+	}
+	if server == "" {
+		server = c.domain
+	}
+	_, err := fmt.Fprintf(c.stanzaWriter, "<iq from='%s' to='%s' id='%s' type='get'>"+
+		"<ping xmlns='urn:xmpp:ping'/>"+
+		"</iq>\n",
+		xmlEscape(jid), xmlEscape(server), getUUID())
+	return err
+}
+
+func (c *Client) PingS2S(fromServer, toServer string) error {
+	_, err := fmt.Fprintf(c.stanzaWriter, "<iq from='%s' to='%s' id='%s' type='get'>"+
+		"<ping xmlns='urn:xmpp:ping'/>"+
+		"</iq>\n",
+		xmlEscape(fromServer), xmlEscape(toServer), getUUID())
+	return err
+}
+
+func (c *Client) SendResultPing(id, toServer string) error {
+	_, err := fmt.Fprintf(c.stanzaWriter, "<iq type='result' to='%s' id='%s'/>\n",
+		xmlEscape(toServer), xmlEscape(id))
+	return err
+}
+
+func (c *Client) sendPeriodicPings() {
+	for range c.periodicPingTicker.C {
+		// Reset ticker for periodic pings if configured.
+		if c.periodicPings {
+			c.periodicPingTicker.Reset(c.periodicPingPeriod)
+		}
+		c.periodicPingID = getUUID()
+		c.periodicPingReply = false
+		_, err := fmt.Fprintf(c.stanzaWriter, "<iq from='%s' to='%s' id='%s' type='get'>"+
+			"<ping xmlns='urn:xmpp:ping'/></iq>\n",
+			xmlEscape(c.jid), xmlEscape(c.domain), c.periodicPingID)
+		if err != nil {
+			c.Close()
+		}
+		time.Sleep(c.periodicPingTimeout)
+		if !c.periodicPingReply {
+			c.shutdown = true
+			fmt.Fprintf(c.stanzaWriter, "</stream:stream>\n")
+			c.conn.Close()
+		}
+	}
+}

vendor/github.com/xmppo/go-xmpp/xmpp_pubsub.go

@@ -0,0 +1,140 @@
+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) error {
+	id := getUUID()
+	c.subIDs = append(c.subIDs, id)
+	_, err := c.RawInformation(c.jid,
+		jid,
+		id,
+		"set",
+		pubsubSubscriptionStanza(node, c.jid))
+	return err
+}
+
+func (c *Client) PubsubUnsubscribeNode(node, jid string) error {
+	id := getUUID()
+	c.unsubIDs = append(c.unsubIDs, id)
+	_, err := c.RawInformation(c.jid,
+		jid,
+		id,
+		"set",
+		pubsubUnsubscriptionStanza(node, c.jid))
+	return err
+}
+
+func (c *Client) PubsubRequestLastItems(node, jid string) error {
+	id := getUUID()
+	c.itemsIDs = append(c.itemsIDs, id)
+	body := fmt.Sprintf("<items node='%s'/>", node)
+	_, err := c.RawInformation(c.jid, jid, id, "get", pubsubStanza(body))
+	return err
+}
+
+func (c *Client) PubsubRequestItem(node, jid, id string) error {
+	stanzaID := getUUID()
+	c.itemsIDs = append(c.itemsIDs, stanzaID)
+	body := fmt.Sprintf("<items node='%s'><item id='%s'/></items>", node, id)
+	_, err := c.RawInformation(c.jid, jid, stanzaID, "get", pubsubStanza(body))
+	return err
+}

vendor/github.com/xmppo/go-xmpp/xmpp_subscription.go

@@ -0,0 +1,30 @@
+package xmpp
+
+import (
+	"fmt"
+)
+
+func (c *Client) ApproveSubscription(jid string) {
+	fmt.Fprintf(c.stanzaWriter, "<presence to='%s' type='subscribed'/>\n",
+		xmlEscape(jid))
+}
+
+func (c *Client) RevokeSubscription(jid string) {
+	fmt.Fprintf(c.stanzaWriter, "<presence to='%s' type='unsubscribed'/>\n",
+		xmlEscape(jid))
+}
+
+// Deprecated: Use RevertSubscription instead.
+func (c *Client) RetrieveSubscription(jid string) {
+	c.RevertSubscription(jid)
+}
+
+func (c *Client) RevertSubscription(jid string) {
+	fmt.Fprintf(c.conn, "<presence to='%s' type='unsubscribe'/>\n",
+		xmlEscape(jid))
+}
+
+func (c *Client) RequestSubscription(jid string) {
+	fmt.Fprintf(c.stanzaWriter, "<presence to='%s' type='subscribe'/>\n",
+		xmlEscape(jid))
+}