Remove debug print-out

For now it support enabling SM, replying to ack requests from server,
and trying resuming the session with existing Stream Management state.

.gitignore

@@ -0,0 +1,36 @@
+# Compiled Object files, Static and Dynamic libs (Shared Objects)
+*.o
+*.a
+*.so
+
+# Folders
+_obj
+_test
+
+# Architecture specific extensions/prefixes
+*.[568vq]
+[568vq].out
+
+*.cgo1.go
+*.cgo2.c
+_cgo_defun.c
+_cgo_gotypes.go
+_cgo_export.*
+
+_testmain.go
+
+*.exe
+*.test
+*.prof
+coverage.out
+coverage.txt
+
+.idea/
+*.iml
+.DS_Store
+
+# Do not commit codeship key
+codeship.aes
+codeship.env
+
+priv/

.travis.yml

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

CODE_OF_CONDUCT.md

@@ -0,0 +1,76 @@
+# Contributor Covenant Code of Conduct
+
+## Our Pledge
+
+In the interest of fostering an open and welcoming environment, we as
+contributors and maintainers pledge to making participation in our project and
+our community a harassment-free experience for everyone, regardless of age, body
+size, disability, ethnicity, sex characteristics, gender identity and expression,
+level of experience, education, socio-economic status, nationality, personal
+appearance, race, religion, or sexual identity and orientation.
+
+## Our Standards
+
+Examples of behavior that contributes to creating a positive environment
+include:
+
+* Using welcoming and inclusive language
+* Being respectful of differing viewpoints and experiences
+* Gracefully accepting constructive criticism
+* Focusing on what is best for the community
+* Showing empathy towards other community members
+
+Examples of unacceptable behavior by participants include:
+
+* The use of sexualized language or imagery and unwelcome sexual attention or
+ advances
+* Trolling, insulting/derogatory comments, and personal or political attacks
+* Public or private harassment
+* Publishing others' private information, such as a physical or electronic
+ address, without explicit permission
+* Other conduct which could reasonably be considered inappropriate in a
+ professional setting
+
+## Our Responsibilities
+
+Project maintainers are responsible for clarifying the standards of acceptable
+behavior and are expected to take appropriate and fair corrective action in
+response to any instances of unacceptable behavior.
+
+Project maintainers have the right and responsibility to remove, edit, or
+reject comments, commits, code, wiki edits, issues, and other contributions
+that are not aligned to this Code of Conduct, or to ban temporarily or
+permanently any contributor for other behaviors that they deem inappropriate,
+threatening, offensive, or harmful.
+
+## Scope
+
+This Code of Conduct applies both within project spaces and in public spaces
+when an individual is representing the project or its community. Examples of
+representing a project or community include using an official project e-mail
+address, posting via an official social media account, or acting as an appointed
+representative at an online or offline event. Representation of a project may be
+further defined and clarified by project maintainers.
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be
+reported by contacting the project team at contact@process-one.net. All
+complaints will be reviewed and investigated and will result in a response that
+is deemed necessary and appropriate to the circumstances. The project team is
+obligated to maintain confidentiality with regard to the reporter of an incident.
+Further details of specific enforcement policies may be posted separately.
+
+Project maintainers who do not follow or enforce the Code of Conduct in good
+faith may face temporary or permanent repercussions as determined by other
+members of the project's leadership.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage], version 1.4,
+available at https://www.contributor-covenant.org/version/1/4/code-of-conduct.html
+
+[homepage]: https://www.contributor-covenant.org
+
+For answers to common questions about this code of conduct, see
+https://www.contributor-covenant.org/faq

CONTRIBUTING.md

@@ -0,0 +1,139 @@
+# Contributing
+
+We'd love for you to contribute to our source code and to make our project even better than it is
+today! Here are the guidelines we'd like you to follow:
+
+* [Code of Conduct](#coc)
+* [Questions and Problems](#question)
+* [Issues and Bugs](#issue)
+* [Feature Requests](#feature)
+* [Issue Submission Guidelines](#submit)
+* [Pull Request Submission Guidelines](#submit-pr)
+* [Signing the CLA](#cla)
+
+## <a name="coc"></a> Code of Conduct
+
+Help us keep our community open-minded and inclusive. Please read and follow our [Code of Conduct][coc].
+
+## <a name="requests"></a> Questions, Bugs, Features
+
+### <a name="question"></a> Got a Question or Problem?
+
+Do not open issues for general support questions as we want to keep GitHub issues for bug reports
+and feature requests. You've got much better chances of getting your question answered on dedicated
+support platforms, the best being [Stack Overflow][stackoverflow].
+
+Stack Overflow is a much better place to ask questions since:
+
+- there are thousands of people willing to help on Stack Overflow
+- questions and answers stay available for public viewing so your question / answer might help
+  someone else
+- Stack Overflow's voting system assures that the best answers are prominently visible.
+
+To save your and our time, we will systematically close all issues that are requests for general
+support and redirect people to the section you are reading right now.
+
+### <a name="issue"></a> Found an Issue or Bug?
+
+If you find a bug in the source code, you can help us by submitting an issue to our
+[GitHub Repository][github]. Even better, you can submit a Pull Request with a fix.
+
+### <a name="feature"></a> Missing a Feature?
+
+You can request a new feature by submitting an issue to our [GitHub Repository][github-issues].
+
+If you would like to implement a new feature then consider what kind of change it is:
+
+* **Major Changes** that you wish to contribute to the project should be discussed first in an
+  [GitHub issue][github-issues] that clearly outlines the changes and benefits of the feature.
+* **Small Changes** can directly be crafted and submitted to the [GitHub Repository][github]
+  as a Pull Request. See the section about [Pull Request Submission Guidelines](#submit-pr).
+
+## <a name="submit"></a> Issue Submission Guidelines
+
+Before you submit your issue search the archive, maybe your question was already answered.
+
+If your issue appears to be a bug, and hasn't been reported, open a new issue. Help us to maximize
+the effort we can spend fixing issues and adding new features, by not reporting duplicate issues.
+
+The "[new issue][github-new-issue]" form contains a number of prompts that you should fill out to
+make it easier to understand and categorize the issue.
+
+## <a name="submit-pr"></a> Pull Request Submission Guidelines
+
+By submitting a pull request for a code or doc contribution, you need to have the right
+to grant your contribution's copyright license to ProcessOne. Please check [ProcessOne CLA][cla]
+for details.
+
+Before you submit your pull request consider the following guidelines:
+
+* Search [GitHub][github-pr] for an open or closed Pull Request
+  that relates to your submission. You don't want to duplicate effort.
+* Make your changes in a new git branch:
+
+    ```shell
+    git checkout -b my-fix-branch master
+    ```
+* Test your changes and, if relevant, expand the automated test suite.
+* Create your patch commit, including appropriate test cases.
+* If the changes affect public APIs, change or add relevant documentation.
+* Commit your changes using a descriptive commit message.
+
+    ```shell
+    git commit -a
+    ```
+  Note: the optional commit `-a` command line option will automatically "add" and "rm" edited files.
+
+* Push your branch to GitHub:
+
+    ```shell
+    git push origin my-fix-branch
+    ```
+
+* In GitHub, send a pull request to `master` branch. This will trigger the continuous integration and run the test.
+We will also notify you if you have not yet signed the [contribution agreement][cla].
+
+* If you find that the continunous integration has failed, look into the logs to find out
+if your changes caused test failures, the commit message was malformed etc. If you find that the
+tests failed or times out for unrelated reasons, you can ping a team member so that the build can be
+restarted.
+
+* If we suggest changes, then:
+
+  * Make the required updates.
+  * Test your changes and test cases.
+  * Commit your changes to your branch (e.g. `my-fix-branch`).
+  * Push the changes to your GitHub repository (this will update your Pull Request).
+
+    You can also amend the initial commits and force push them to the branch.
+
+    ```shell
+    git rebase master -i
+    git push origin my-fix-branch -f
+    ```
+
+    This is generally easier to follow, but separate commits are useful if the Pull Request contains
+    iterations that might be interesting to see side-by-side.
+
+That's it! Thank you for your contribution!
+
+## <a name="cla"></a> Signing the Contributor License Agreement (CLA)
+
+Upon submitting a Pull Request, we will ask you to sign our CLA if you haven't done
+so before. It's a quick process, we promise, and you will be able to do it all online
+
+You can read [ProcessOne Contribution License Agreement][cla] in PDF.
+
+This is part of the legal framework of the open-source ecosystem that adds some red tape,
+but protects both the contributor and the company / foundation behind the project. It also
+gives us the option to relicense the code with a more permissive license in the future.
+
+
+[coc]: https://github.com/FluuxIO/go-xmpp/blob/master/CODE_OF_CONDUCT.md
+[stackoverflow]: https://stackoverflow.com/
+[github]: https://github.com/FluuxIO/go-xmpp
+[github-issues]: https://github.com/FluuxIO/go-xmpp/issues
+[github-new-issue]: https://github.com/FluuxIO/go-xmpp/issues/new
+[github-pr]: https://github.com/FluuxIO/go-xmpp/pulls
+[cla]: https://www.process-one.net/resources/ejabberd-cla.pdf
+[license]: https://github.com/FluuxIO/go-xmpp/blob/master/LICENSE

Dockerfile

@@ -0,0 +1,4 @@
+FROM golang:1.12
+WORKDIR /xmpp
+RUN curl -o codecov.sh -s https://codecov.io/bash && chmod +x codecov.sh
+COPY . ./

LICENSE

@@ -1,27 +1,29 @@
-Copyright (c) 2009 The Go Authors. All rights reserved.
+BSD 3-Clause License
+
+Copyright (c) 2017, ProcessOne SARL
+All rights reserved.
 
 Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions are
+modification, are permitted provided that the following conditions are met:
-met:
 
-   * Redistributions of source code must retain the above copyright
+* Redistributions of source code must retain the above copyright notice, this
-notice, this list of conditions and the following disclaimer.
+  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
+* Redistributions in binary form must reproduce the above copyright notice,
-in the documentation and/or other materials provided with the
+  this list of conditions and the following disclaimer in the documentation
-distribution.
+  and/or other materials provided with the distribution.
-   * Neither the name of Google Inc. nor the names of its
+
+* Neither the name of the copyright holder 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
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

README.md

@@ -1,6 +1,133 @@
-go-xmpp
+# Fluux XMPP
-=======
 
-go xmpp library (original was written by russ cox  )
+[![Codeship Status for FluuxIO/xmpp](https://app.codeship.com/projects/dba7f300-d145-0135-6c51-26e28af241d2/status?branch=master)](https://app.codeship.com/projects/262399) [![GoDoc](https://godoc.org/gosrc.io/xmpp?status.svg)](https://godoc.org/gosrc.io/xmpp) [![GoReportCard](https://goreportcard.com/badge/gosrc.io/xmpp)](https://goreportcard.com/report/fluux.io/xmpp) [![codecov](https://codecov.io/gh/FluuxIO/go-xmpp/branch/master/graph/badge.svg)](https://codecov.io/gh/FluuxIO/go-xmpp)
 
-[Documentation](https://godoc.org/github.com/xmppo/go-xmpp)
+Fluux XMPP is a Go XMPP library, focusing on simplicity, simple automation, and IoT.
+
+The goal is to make simple to write simple XMPP clients and components:
+
+- For automation (like for example monitoring of an XMPP service),
+- For building connected "things" by plugging them on an XMPP server,
+- For writing simple chatbot to control a service or a thing,
+- For writing XMPP servers components.
+
+The library is designed to have minimal dependencies. For now, the library does not depend on any other library.
+
+## Configuration and connection
+
+### Allowing Insecure TLS connection during development
+
+It is not recommended to disable the check for domain name and certificate chain. Doing so would open your client
+to man-in-the-middle attacks.
+
+However, in development, XMPP servers often use self-signed certificates. In that situation, it is better to add the
+root CA that signed the certificate to your trusted list of root CA. It avoids changing the code and limit the risk
+of shipping an insecure client to production.
+
+That said, if you really want to allow your client to trust any TLS certificate, you can customize Go standard 
+`tls.Config` and set it in Config struct.
+
+Here is an example code to configure a client to allow connecting to a server with self-signed certificate. Note the 
+`InsecureSkipVerify` option. When using this `tls.Config` option, all the checks on the certificate are skipped.
+
+```go
+config := xmpp.Config{
+	Address:      "localhost:5222",
+	Jid:          "test@localhost",
+	Password:     "test",
+	TLSConfig:     tls.Config{InsecureSkipVerify: true},
+}
+```
+
+## Supported specifications
+
+### Clients
+
+- [RFC 6120: XMPP Core](https://xmpp.org/rfcs/rfc6120.html)
+- [RFC 6121: XMPP Instant Messaging and Presence](https://xmpp.org/rfcs/rfc6121.html)
+
+### Components
+
+  - [XEP-0114: Jabber Component Protocol](https://xmpp.org/extensions/xep-0114.html)
+  - [XEP-0355: Namespace Delegation](https://xmpp.org/extensions/xep-0355.html)
+  - [XEP-0356: Privileged Entity](https://xmpp.org/extensions/xep-0356.html)
+
+## Stanza subpackage
+
+XMPP stanzas are basic and extensible XML elements. Stanzas (or sometimes special stanzas called 'nonzas') are used to 
+leverage the XMPP protocol features. During a session, a client (or a component) and a server will be exchanging stanzas
+back and forth.
+
+At a low-level, stanzas are XML fragments. However, Fluux XMPP library provides the building blocks to interact with
+stanzas at a high-level, providing a Go-friendly API.
+
+The `stanza` subpackage provides support for XMPP stream parsing, marshalling and unmarshalling of XMPP stanza. It is a
+bridge between high-level Go structure and low-level XMPP protocol.
+
+Parsing, marshalling and unmarshalling is automatically handled by Fluux XMPP client library. As a developer, you will
+generally manipulates only the high-level structs provided by the stanza package.
+
+The XMPP protocol, as the name implies is extensible. If your application is using custom stanza extensions, you can
+implement your own extensions directly in your own application.
+
+To learn more about the stanza package, you can read more in the
+[stanza package documentation](https://github.com/FluuxIO/go-xmpp/blob/master/stanza/README.md).
+
+## Examples
+
+We have several [examples](https://github.com/FluuxIO/go-xmpp/tree/master/_examples) to help you get started using
+Fluux XMPP library.
+
+Here is the demo "echo" client:
+
+```go
+package main
+
+import (
+	"fmt"
+	"log"
+	"os"
+
+	"gosrc.io/xmpp"
+	"gosrc.io/xmpp/stanza"
+)
+
+func main() {
+	config := xmpp.Config{
+		Address:      "localhost:5222",
+		Jid:          "test@localhost",
+		Password:     "test",
+		StreamLogger: os.Stdout,
+		Insecure:     true,
+	}
+
+	router := xmpp.NewRouter()
+	router.HandleFunc("message", handleMessage)
+
+	client, err := xmpp.NewClient(config, router)
+	if err != nil {
+		log.Fatalf("%+v", err)
+	}
+
+	// If you pass the client to a connection manager, it will handle the reconnect policy
+	// for you automatically.
+	cm := xmpp.NewStreamManager(client, nil)
+	log.Fatal(cm.Run())
+}
+
+func handleMessage(s xmpp.Sender, p stanza.Packet) {
+	msg, ok := p.(stanza.Message)
+	if !ok {
+		_, _ = fmt.Fprintf(os.Stdout, "Ignoring packet: %T\n", p)
+		return
+	}
+
+	_, _ = fmt.Fprintf(os.Stdout, "Body = %s - from = %s\n", msg.Body, msg.From)
+	reply := stanza.Message{Attrs: stanza.Attrs{To: msg.From}, Body: msg.Body}
+	_ = s.Send(reply)
+}
+```
+
+## Reference documentation
+
+The code documentation is available on GoDoc: [gosrc.io/xmpp](https://godoc.org/gosrc.io/xmpp)

_example/example-gui.go

@@ -1,113 +0,0 @@
-package main
-
-import (
-	"crypto/tls"
-	"log"
-	"os"
-	"strings"
-
-	"github.com/matterbridge/go-xmpp"
-	"github.com/mattn/go-gtk/gtk"
-)
-
-func main() {
-	gtk.Init(&os.Args)
-
-	window := gtk.NewWindow(gtk.WINDOW_TOPLEVEL)
-	window.SetTitle("GoTalk")
-	window.Connect("destroy", func() {
-		gtk.MainQuit()
-	})
-	vbox := gtk.NewVBox(false, 1)
-	scrolledwin := gtk.NewScrolledWindow(nil, nil)
-	textview := gtk.NewTextView()
-	textview.SetEditable(false)
-	textview.SetCursorVisible(false)
-	scrolledwin.Add(textview)
-	vbox.Add(scrolledwin)
-
-	buffer := textview.GetBuffer()
-
-	entry := gtk.NewEntry()
-	vbox.PackEnd(entry, false, false, 0)
-
-	window.Add(vbox)
-	window.SetSizeRequest(300, 400)
-	window.ShowAll()
-
-	dialog := gtk.NewDialog()
-	dialog.SetTitle(window.GetTitle())
-	sgroup := gtk.NewSizeGroup(gtk.SIZE_GROUP_HORIZONTAL)
-
-	hbox := gtk.NewHBox(false, 1)
-	dialog.GetVBox().Add(hbox)
-	label := gtk.NewLabel("username:")
-	sgroup.AddWidget(label)
-	hbox.Add(label)
-	username := gtk.NewEntry()
-	hbox.Add(username)
-
-	hbox = gtk.NewHBox(false, 1)
-	dialog.GetVBox().Add(hbox)
-	label = gtk.NewLabel("password:")
-	sgroup.AddWidget(label)
-	hbox.Add(label)
-	password := gtk.NewEntry()
-	password.SetVisibility(false)
-	hbox.Add(password)
-
-	dialog.AddButton(gtk.STOCK_OK, gtk.RESPONSE_OK)
-	dialog.AddButton(gtk.STOCK_CANCEL, gtk.RESPONSE_CANCEL)
-	dialog.SetDefaultResponse(gtk.RESPONSE_OK)
-	dialog.SetTransientFor(window)
-	dialog.ShowAll()
-	res := dialog.Run()
-	username_ := username.GetText()
-	password_ := password.GetText()
-	dialog.Destroy()
-	if res != gtk.RESPONSE_OK {
-		os.Exit(0)
-	}
-
-	xmpp.DefaultConfig = tls.Config{
-		ServerName:         "talk.google.com",
-		InsecureSkipVerify: false,
-	}
-
-	talk, err := xmpp.NewClient("talk.google.com:443", username_, password_, false)
-	if err != nil {
-		log.Fatal(err)
-	}
-
-	entry.Connect("activate", func() {
-		text := entry.GetText()
-		tokens := strings.SplitN(text, " ", 2)
-		if len(tokens) == 2 {
-			func() {
-				defer recover()
-				talk.Send(xmpp.Chat{Remote: tokens[0], Type: "chat", Text: tokens[1]})
-				entry.SetText("")
-			}()
-		}
-	})
-
-	go func() {
-		for {
-			func() {
-				defer recover()
-				chat, err := talk.Recv()
-				if err != nil {
-					log.Fatal(err)
-				}
-
-				var iter gtk.TextIter
-				buffer.GetStartIter(&iter)
-				if msg, ok := chat.(xmpp.Chat); ok {
-					buffer.Insert(&iter, msg.Remote+": "+msg.Text+"\n")
-				}
-			}()
-		}
-	}()
-
-	gtk.Main()
-}

_example/example.go

@@ -1,97 +0,0 @@
-package main
-
-import (
-	"bufio"
-	"crypto/tls"
-	"flag"
-	"fmt"
-	"log"
-	"os"
-	"strings"
-
-	"github.com/matterbridge/go-xmpp"
-)
-
-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]
-}
-
-func main() {
-	flag.Usage = func() {
-		fmt.Fprintf(os.Stderr, "usage: example [options]\n")
-		flag.PrintDefaults()
-		os.Exit(2)
-	}
-	flag.Parse()
-	if *username == "" || *password == "" {
-		if *debug && *username == "" && *password == "" {
-			fmt.Fprintf(os.Stderr, "no username or password were given; attempting ANONYMOUS auth\n")
-		} else if *username != "" || *password != "" {
-			flag.Usage()
-		}
-	}
-
-	if !*notls {
-		xmpp.DefaultConfig = tls.Config{
-			ServerName:         serverName(*server),
-			InsecureSkipVerify: false,
-		}
-	}
-
-	var talk *xmpp.Client
-	var err error
-	options := xmpp.Options{
-		Host:          *server,
-		User:          *username,
-		Password:      *password,
-		NoTLS:         *notls,
-		Debug:         *debug,
-		Session:       *session,
-		Status:        *status,
-		StatusMessage: *statusMessage,
-	}
-
-	talk, err = options.NewClient()
-	if err != nil {
-		log.Fatal(err)
-	}
-
-	go func() {
-		for {
-			chat, err := talk.Recv()
-			if err != nil {
-				log.Fatal(err)
-			}
-			switch v := chat.(type) {
-			case xmpp.Chat:
-				fmt.Println(v.Remote, v.Text)
-			case xmpp.Presence:
-				fmt.Println(v.From, v.Show)
-			}
-		}
-	}()
-	for {
-		in := bufio.NewReader(os.Stdin)
-		line, err := in.ReadString('\n')
-		if err != nil {
-			continue
-		}
-		line = strings.TrimRight(line, "\n")
-
-		tokens := strings.SplitN(line, " ", 2)
-		if len(tokens) == 2 {
-			talk.Send(xmpp.Chat{Remote: tokens[0], Type: "chat", Text: tokens[1]})
-		}
-	}
-}

_examples/custom_stanza/README.md

@@ -0,0 +1,5 @@
+# Custom Stanza example
+
+This module show how to implement a custom extension for your own client, without having to modify or fork Fluux XMPP.
+
+It help integrating your custom extension in the standard stream parsing, marshalling and unmarshalling workflow.

_examples/custom_stanza/custom_stanza.go

@@ -0,0 +1,49 @@
+package main
+
+import (
+	"encoding/xml"
+	"fmt"
+	"log"
+
+	"gosrc.io/xmpp/stanza"
+)
+
+func main() {
+	iq := stanza.NewIQ(stanza.Attrs{Type: stanza.IQTypeGet, To: "service.localhost", Id: "custom-pl-1"})
+	payload := CustomPayload{XMLName: xml.Name{Space: "my:custom:payload", Local: "query"}, Node: "test"}
+	iq.Payload = payload
+
+	data, err := xml.Marshal(iq)
+	if err != nil {
+		log.Fatalf("Cannot marshal iq with custom payload: %s", err)
+	}
+
+	var parsedIQ stanza.IQ
+	if err = xml.Unmarshal(data, &parsedIQ); err != nil {
+		log.Fatalf("Cannot unmarshal(%s): %s", data, err)
+	}
+
+	parsedPayload, ok := parsedIQ.Payload.(*CustomPayload)
+	if !ok {
+		log.Fatalf("Incorrect payload type: %#v", parsedIQ.Payload)
+	}
+
+	fmt.Printf("Parsed Payload: %#v", parsedPayload)
+
+	if parsedPayload.Node != "test" {
+		log.Fatalf("Incorrect node value: %s", parsedPayload.Node)
+	}
+}
+
+type CustomPayload struct {
+	XMLName xml.Name `xml:"my:custom:payload query"`
+	Node    string   `xml:"node,attr,omitempty"`
+}
+
+func (c CustomPayload) Namespace() string {
+	return c.XMLName.Space
+}
+
+func init() {
+	stanza.TypeRegistry.MapExtension(stanza.PKTIQ, xml.Name{"my:custom:payload", "query"}, CustomPayload{})
+}

_examples/delegation/README.md

@@ -0,0 +1,5 @@
+# Advanced component: delegation
+
+`delegation` is an example of advanced component supporting Namespace Delegation
+([XEP-0355](https://xmpp.org/extensions/xep-0355.html)) and privileged entity
+([XEP-356](https://xmpp.org/extensions/xep-0356.html)).

_examples/delegation/delegation.go

@@ -0,0 +1,206 @@
+package main
+
+import (
+	"encoding/xml"
+	"fmt"
+	"log"
+
+	"gosrc.io/xmpp"
+	"gosrc.io/xmpp/stanza"
+)
+
+func main() {
+	opts := xmpp.ComponentOptions{
+		Domain:  "service.localhost",
+		Secret:  "mypass",
+		Address: "localhost:9999",
+
+		// TODO: Move that part to a component discovery handler
+		Name:     "Test Component",
+		Category: "gateway",
+		Type:     "service",
+	}
+
+	router := xmpp.NewRouter()
+	router.HandleFunc("message", handleMessage)
+	router.NewRoute().
+		IQNamespaces(stanza.NSDiscoInfo).
+		HandlerFunc(func(s xmpp.Sender, p stanza.Packet) {
+			discoInfo(s, p, opts)
+		})
+	router.NewRoute().
+		IQNamespaces("urn:xmpp:delegation:1").
+		HandlerFunc(handleDelegation)
+
+	component, err := xmpp.NewComponent(opts, router)
+	if err != nil {
+		log.Fatalf("%+v", err)
+	}
+
+	// If you pass the component to a stream manager, it will handle the reconnect policy
+	// for you automatically.
+	// TODO: Post Connect could be a feature of the router or the client. Move it somewhere else.
+	cm := xmpp.NewStreamManager(component, nil)
+	log.Fatal(cm.Run())
+}
+
+func handleMessage(_ xmpp.Sender, p stanza.Packet) {
+	msg, ok := p.(stanza.Message)
+	if !ok {
+		return
+	}
+	var msgProcessed bool
+	for _, ext := range msg.Extensions {
+		delegation, ok := ext.(*stanza.Delegation)
+		if ok {
+			msgProcessed = true
+			fmt.Printf("Delegation confirmed for namespace %s\n", delegation.Delegated.Namespace)
+		}
+	}
+	// TODO: Decode privilege message
+	// <message to='service.localhost' from='localhost'><privilege xmlns='urn:xmpp:privilege:1'><perm type='outgoing' access='message'/><perm type='get' access='roster'/><perm type='managed_entity' access='presence'/></privilege></message>
+
+	if !msgProcessed {
+		fmt.Printf("Ignored received message, not related to delegation: %v\n", msg)
+	}
+}
+
+const (
+	pubsubNode = "urn:xmpp:delegation:1::http://jabber.org/protocol/pubsub"
+	pepNode    = "urn:xmpp:delegation:1:bare:http://jabber.org/protocol/pubsub"
+)
+
+// TODO: replace xmpp.Sender by ctx xmpp.Context ?
+// ctx.Stream.Send / SendRaw
+// ctx.Opts
+func discoInfo(c xmpp.Sender, p stanza.Packet, opts xmpp.ComponentOptions) {
+	// Type conversion & sanity checks
+	iq, ok := p.(stanza.IQ)
+	if !ok {
+		return
+	}
+	info, ok := iq.Payload.(*stanza.DiscoInfo)
+	if !ok {
+		return
+	}
+
+	iqResp := stanza.NewIQ(stanza.Attrs{Type: "result", From: iq.To, To: iq.From, Id: iq.Id})
+
+	switch info.Node {
+	case "":
+		discoInfoRoot(&iqResp, opts)
+	case pubsubNode:
+		discoInfoPubSub(&iqResp)
+	case pepNode:
+		discoInfoPEP(&iqResp)
+	}
+
+	_ = c.Send(iqResp)
+}
+
+func discoInfoRoot(iqResp *stanza.IQ, opts xmpp.ComponentOptions) {
+	disco := iqResp.DiscoInfo()
+	disco.AddIdentity(opts.Name, opts.Category, opts.Type)
+	disco.AddFeatures(stanza.NSDiscoInfo, stanza.NSDiscoItems, "jabber:iq:version", "urn:xmpp:delegation:1")
+}
+
+func discoInfoPubSub(iqResp *stanza.IQ) {
+	payload := stanza.DiscoInfo{
+		XMLName: xml.Name{
+			Space: stanza.NSDiscoInfo,
+			Local: "query",
+		},
+		Node: pubsubNode,
+		Features: []stanza.Feature{
+			{Var: "http://jabber.org/protocol/pubsub"},
+			{Var: "http://jabber.org/protocol/pubsub#publish"},
+			{Var: "http://jabber.org/protocol/pubsub#subscribe"},
+			{Var: "http://jabber.org/protocol/pubsub#publish-options"},
+		},
+	}
+	iqResp.Payload = &payload
+}
+
+func discoInfoPEP(iqResp *stanza.IQ) {
+	identity := stanza.Identity{
+		Category: "pubsub",
+		Type:     "pep",
+	}
+	payload := stanza.DiscoInfo{
+		XMLName: xml.Name{
+			Space: stanza.NSDiscoInfo,
+			Local: "query",
+		},
+		Identity: []stanza.Identity{identity},
+		Node:     pepNode,
+		Features: []stanza.Feature{
+			{Var: "http://jabber.org/protocol/pubsub#access-presence"},
+			{Var: "http://jabber.org/protocol/pubsub#auto-create"},
+			{Var: "http://jabber.org/protocol/pubsub#auto-subscribe"},
+			{Var: "http://jabber.org/protocol/pubsub#config-node"},
+			{Var: "http://jabber.org/protocol/pubsub#create-and-configure"},
+			{Var: "http://jabber.org/protocol/pubsub#create-nodes"},
+			{Var: "http://jabber.org/protocol/pubsub#filtered-notifications"},
+			{Var: "http://jabber.org/protocol/pubsub#persistent-items"},
+			{Var: "http://jabber.org/protocol/pubsub#publish"},
+			{Var: "http://jabber.org/protocol/pubsub#retrieve-items"},
+			{Var: "http://jabber.org/protocol/pubsub#subscribe"},
+		},
+	}
+	iqResp.Payload = &payload
+}
+
+func handleDelegation(s xmpp.Sender, p stanza.Packet) {
+	// Type conversion & sanity checks
+	iq, ok := p.(stanza.IQ)
+	if !ok {
+		return
+	}
+
+	delegation, ok := iq.Payload.(*stanza.Delegation)
+	if !ok {
+		return
+	}
+	forwardedPacket := delegation.Forwarded.Stanza
+	fmt.Println(forwardedPacket)
+	forwardedIQ, ok := forwardedPacket.(stanza.IQ)
+	if !ok {
+		return
+	}
+
+	pubsub, ok := forwardedIQ.Payload.(*stanza.PubSub)
+	if !ok {
+		// We only support pubsub delegation
+		return
+	}
+
+	if pubsub.Publish.XMLName.Local == "publish" {
+		// Prepare pubsub IQ reply
+		iqResp := stanza.NewIQ(stanza.Attrs{Type: "result", From: forwardedIQ.To, To: forwardedIQ.From, Id: forwardedIQ.Id})
+		payload := stanza.PubSub{
+			XMLName: xml.Name{
+				Space: "http://jabber.org/protocol/pubsub",
+				Local: "pubsub",
+			},
+		}
+		iqResp.Payload = &payload
+		// Wrap the reply in delegation 'forward'
+		iqForward := stanza.NewIQ(stanza.Attrs{Type: "result", From: iq.To, To: iq.From, Id: iq.Id})
+		delegPayload := stanza.Delegation{
+			XMLName: xml.Name{
+				Space: "urn:xmpp:delegation:1",
+				Local: "delegation",
+			},
+			Forwarded: &stanza.Forwarded{
+				XMLName: xml.Name{
+					Space: "urn:xmpp:forward:0",
+					Local: "forward",
+				},
+				Stanza: iqResp,
+			},
+		}
+		iqForward.Payload = &delegPayload
+		_ = s.Send(iqForward)
+		// TODO: The component should actually broadcast the mood to subscribers
+	}
+}

_examples/go.mod

@@ -0,0 +1,11 @@
+module gosrc.io/xmpp/_examples
+
+go 1.12
+
+require (
+	github.com/processone/mpg123 v1.0.0
+	github.com/processone/soundcloud v1.0.0
+	gosrc.io/xmpp v0.1.1
+)
+
+replace gosrc.io/xmpp => ./../

_examples/go.sum

@@ -0,0 +1,6 @@
+github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
+github.com/processone/mpg123 v1.0.0/go.mod h1:X/FeL+h8vD1bYsG9tIWV3M2c4qNTZOficyvPVBP08go=
+github.com/processone/soundcloud v1.0.0/go.mod h1:kDLeWpkRtN3C8kIReQdxoiRi92P9xR6yW6qLOJnNWfY=
+golang.org/x/net v0.0.0-20190110200230-915654e7eabc/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
+golang.org/x/xerrors v0.0.0-20190513163551-3ee3066db522 h1:bhOzK9QyoD0ogCnFro1m2mz41+Ib0oOhfJnBp5MR4K4=
+golang.org/x/xerrors v0.0.0-20190513163551-3ee3066db522/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=

_examples/xmpp_component/README.md

@@ -0,0 +1,22 @@
+# xmpp_component
+
+This component will connect to ejabberd and act as a subdomain "service" of your primary XMPP domain
+(in that case localhost).
+
+This component does nothing expect connect and show up in service discovery.
+
+To be able to connect this component, you need to add a listener to your XMPP server.
+
+Here is an example ejabberd configuration for that component listener:
+
+```yaml
+listen:
+...
+  -
+    port: 8888
+    module: ejabberd_service
+    password: "mypass"
+```
+
+ejabberd will listen for a component (service) on port 8888 and allows it to connect using the
+secret "mypass".

_examples/xmpp_component/xmpp_component.go

@@ -0,0 +1,101 @@
+package main
+
+import (
+	"fmt"
+	"log"
+
+	"gosrc.io/xmpp"
+	"gosrc.io/xmpp/stanza"
+)
+
+func main() {
+	opts := xmpp.ComponentOptions{
+		Domain:   "service2.localhost",
+		Secret:   "mypass",
+		Address:  "localhost:8888",
+		Name:     "Test Component",
+		Category: "gateway",
+		Type:     "service",
+	}
+
+	router := xmpp.NewRouter()
+	router.HandleFunc("message", handleMessage)
+	router.NewRoute().
+		IQNamespaces(stanza.NSDiscoInfo).
+		HandlerFunc(func(s xmpp.Sender, p stanza.Packet) {
+			discoInfo(s, p, opts)
+		})
+	router.NewRoute().
+		IQNamespaces(stanza.NSDiscoItems).
+		HandlerFunc(discoItems)
+	router.NewRoute().
+		IQNamespaces("jabber:iq:version").
+		HandlerFunc(handleVersion)
+
+	component, err := xmpp.NewComponent(opts, router)
+	if err != nil {
+		log.Fatalf("%+v", err)
+	}
+
+	// If you pass the component to a stream manager, it will handle the reconnect policy
+	// for you automatically.
+	// TODO: Post Connect could be a feature of the router or the client. Move it somewhere else.
+	cm := xmpp.NewStreamManager(component, nil)
+	log.Fatal(cm.Run())
+}
+
+func handleMessage(_ xmpp.Sender, p stanza.Packet) {
+	msg, ok := p.(stanza.Message)
+	if !ok {
+		return
+	}
+	fmt.Println("Received message:", msg.Body)
+}
+
+func discoInfo(c xmpp.Sender, p stanza.Packet, opts xmpp.ComponentOptions) {
+	// Type conversion & sanity checks
+	iq, ok := p.(stanza.IQ)
+	if !ok || iq.Type != "get" {
+		return
+	}
+
+	iqResp := stanza.NewIQ(stanza.Attrs{Type: "result", From: iq.To, To: iq.From, Id: iq.Id, Lang: "en"})
+	disco := iqResp.DiscoInfo()
+	disco.AddIdentity(opts.Name, opts.Category, opts.Type)
+	disco.AddFeatures(stanza.NSDiscoInfo, stanza.NSDiscoItems, "jabber:iq:version", "urn:xmpp:delegation:1")
+	_ = c.Send(iqResp)
+}
+
+// TODO: Handle iq error responses
+func discoItems(c xmpp.Sender, p stanza.Packet) {
+	// Type conversion & sanity checks
+	iq, ok := p.(stanza.IQ)
+	if !ok || iq.Type != "get" {
+		return
+	}
+
+	discoItems, ok := iq.Payload.(*stanza.DiscoItems)
+	if !ok {
+		return
+	}
+
+	iqResp := stanza.NewIQ(stanza.Attrs{Type: "result", From: iq.To, To: iq.From, Id: iq.Id, Lang: "en"})
+	items := iqResp.DiscoItems()
+
+	if discoItems.Node == "" {
+		items.AddItem("service.localhost", "node1", "test node")
+	}
+	_ = c.Send(iqResp)
+}
+
+func handleVersion(c xmpp.Sender, p stanza.Packet) {
+	// Type conversion & sanity checks
+	iq, ok := p.(stanza.IQ)
+	if !ok {
+		return
+	}
+
+	iqResp := stanza.NewIQ(stanza.Attrs{Type: "result", From: iq.To, To: iq.From, Id: iq.Id, Lang: "en"})
+	iqResp.Version().SetInfo("Fluux XMPP Component", "0.0.1", "")
+	_ = c.Send(iqResp)
+}

_examples/xmpp_echo/xmpp_echo.go

@@ -0,0 +1,53 @@
+/*
+xmpp_echo is a demo client that connect on an XMPP server and echo message received back to original sender.
+*/
+
+package main
+
+import (
+	"fmt"
+	"log"
+	"os"
+
+	"gosrc.io/xmpp"
+	"gosrc.io/xmpp/stanza"
+)
+
+func main() {
+	config := xmpp.Config{
+		Address:      "localhost:5222",
+		Jid:          "test@localhost",
+		Password:     "test",
+		StreamLogger: os.Stdout,
+		Insecure:     true,
+		// TLSConfig: tls.Config{InsecureSkipVerify: true},
+	}
+
+	router := xmpp.NewRouter()
+	router.HandleFunc("message", handleMessage)
+
+	client, err := xmpp.NewClient(config, router)
+	if err != nil {
+		log.Fatalf("%+v", err)
+	}
+
+	// If you pass the client to a connection manager, it will handle the reconnect policy
+	// for you automatically.
+	cm := xmpp.NewStreamManager(client, nil)
+	log.Fatal(cm.Run())
+}
+
+func handleMessage(s xmpp.Sender, p stanza.Packet) {
+	msg, ok := p.(stanza.Message)
+	if !ok {
+		_, _ = fmt.Fprintf(os.Stdout, "Ignoring packet: %T\n", p)
+		return
+	}
+
+	_, _ = fmt.Fprintf(os.Stdout, "Body = %s - from = %s\n", msg.Body, msg.From)
+	reply := stanza.Message{Attrs: stanza.Attrs{To: msg.From}, Body: msg.Body}
+	_ = s.Send(reply)
+}
+
+// TODO create default command line client to send message or to send an arbitrary XMPP sequence from a file,
+//   (using templates ?)

_examples/xmpp_jukebox/xmpp_jukebox.go

@@ -0,0 +1,125 @@
+// Can be launched with:
+//   ./xmpp_jukebox -jid=test@localhost/jukebox -password=test -address=localhost:5222
+package main
+
+import (
+	"flag"
+	"fmt"
+	"log"
+	"os"
+	"strings"
+
+	"github.com/processone/mpg123"
+	"github.com/processone/soundcloud"
+	"gosrc.io/xmpp"
+	"gosrc.io/xmpp/stanza"
+)
+
+// Get the actual song Stream URL from SoundCloud website song URL and play it with mpg123 player.
+const scClientID = "dde6a0075614ac4f3bea423863076b22"
+
+func main() {
+	jid := flag.String("jid", "", "jukebok XMPP JID, resource is optional")
+	password := flag.String("password", "", "XMPP account password")
+	address := flag.String("address", "", "If needed, XMPP server DNSName or IP and optional port (ie myserver:5222)")
+	flag.Parse()
+
+	// 1. Create mpg player
+	player, err := mpg123.NewPlayer()
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	// 2. Prepare XMPP client
+	config := xmpp.Config{
+		Address:  *address,
+		Jid:      *jid,
+		Password: *password,
+		// StreamLogger: os.Stdout,
+		Insecure: true,
+	}
+
+	router := xmpp.NewRouter()
+	router.NewRoute().
+		Packet("message").
+		HandlerFunc(func(s xmpp.Sender, p stanza.Packet) {
+			handleMessage(s, p, player)
+		})
+	router.NewRoute().
+		Packet("message").
+		HandlerFunc(func(s xmpp.Sender, p stanza.Packet) {
+			handleIQ(s, p, player)
+		})
+
+	client, err := xmpp.NewClient(config, router)
+	if err != nil {
+		log.Fatalf("%+v", err)
+	}
+
+	cm := xmpp.NewStreamManager(client, nil)
+	log.Fatal(cm.Run())
+}
+
+func handleMessage(s xmpp.Sender, p stanza.Packet, player *mpg123.Player) {
+	msg, ok := p.(stanza.Message)
+	if !ok {
+		return
+	}
+	command := strings.Trim(msg.Body, " ")
+	if command == "stop" {
+		player.Stop()
+	} else {
+		playSCURL(player, command)
+		sendUserTune(s, "Radiohead", "Spectre")
+	}
+}
+
+func handleIQ(s xmpp.Sender, p stanza.Packet, player *mpg123.Player) {
+	iq, ok := p.(stanza.IQ)
+	if !ok {
+		return
+	}
+	switch payload := iq.Payload.(type) {
+	// We support IOT Control IQ
+	case *stanza.ControlSet:
+		var url string
+		for _, element := range payload.Fields {
+			if element.XMLName.Local == "string" && element.Name == "url" {
+				url = strings.Trim(element.Value, " ")
+				break
+			}
+		}
+
+		playSCURL(player, url)
+		setResponse := new(stanza.ControlSetResponse)
+		// FIXME: Broken
+		reply := stanza.IQ{Attrs: stanza.Attrs{To: iq.From, Type: "result", Id: iq.Id}, Payload: setResponse}
+		_ = s.Send(reply)
+		// TODO add Soundclound artist / title retrieval
+		sendUserTune(s, "Radiohead", "Spectre")
+	default:
+		_, _ = fmt.Fprintf(os.Stdout, "Other IQ Payload: %T\n", iq.Payload)
+	}
+}
+
+func sendUserTune(s xmpp.Sender, artist string, title string) {
+	tune := stanza.Tune{Artist: artist, Title: title}
+	iq := stanza.NewIQ(stanza.Attrs{Type: "set", Id: "usertune-1", Lang: "en"})
+	payload := stanza.PubSub{Publish: &stanza.Publish{Node: "http://jabber.org/protocol/tune", Item: stanza.Item{Tune: &tune}}}
+	iq.Payload = &payload
+	_ = s.Send(iq)
+}
+
+func playSCURL(p *mpg123.Player, rawURL string) {
+	songID, _ := soundcloud.GetSongID(rawURL)
+	// TODO: Maybe we need to check the track itself to get the stream URL from reply ?
+	url := soundcloud.FormatStreamURL(songID)
+
+	_ = p.Play(url)
+}
+
+// TODO
+// - Have a player API to play, play next, or add to queue
+// - Have the ability to parse custom packet to play sound
+// - Use PEP to display tunes status
+// - Ability to "speak" messages

auth.go

@@ -0,0 +1,53 @@
+package xmpp
+
+import (
+	"encoding/base64"
+	"encoding/xml"
+	"errors"
+	"fmt"
+	"io"
+
+	"gosrc.io/xmpp/stanza"
+)
+
+func authSASL(socket io.ReadWriter, decoder *xml.Decoder, f stanza.StreamFeatures, user string, password string) (err error) {
+	// TODO: Implement other type of SASL Authentication
+	havePlain := false
+	for _, m := range f.Mechanisms.Mechanism {
+		if m == "PLAIN" {
+			havePlain = true
+			break
+		}
+	}
+	if !havePlain {
+		err := fmt.Errorf("PLAIN authentication is not supported by server: %v", f.Mechanisms.Mechanism)
+		return NewConnError(err, true)
+	}
+
+	return authPlain(socket, decoder, user, password)
+}
+
+// Plain authentication: send base64-encoded \x00 user \x00 password
+func authPlain(socket io.ReadWriter, decoder *xml.Decoder, user string, password string) error {
+	raw := "\x00" + user + "\x00" + password
+	enc := make([]byte, base64.StdEncoding.EncodedLen(len(raw)))
+	base64.StdEncoding.Encode(enc, []byte(raw))
+	fmt.Fprintf(socket, "<auth xmlns='%s' mechanism='PLAIN'>%s</auth>", stanza.NSSASL, enc)
+
+	// Next message should be either success or failure.
+	val, err := stanza.NextPacket(decoder)
+	if err != nil {
+		return err
+	}
+
+	switch v := val.(type) {
+	case stanza.SASLSuccess:
+	case stanza.SASLFailure:
+		// v.Any is type of sub-element in failure, which gives a description of what failed.
+		err := errors.New("auth failure: " + v.Any.Local)
+		return NewConnError(err, true)
+	default:
+		return errors.New("expected SASL success or failure, got " + v.Name())
+	}
+	return err
+}

backoff.go

@@ -0,0 +1,101 @@
+/*
+Interesting reference on backoff:
+- Exponential Backoff And Jitter (AWS Blog):
+  https://www.awsarchitectureblog.com/2015/03/backoff.html
+
+We use Jitter as a default for exponential backoff, as the goal of
+this module is not to provide precise 'ticks', but good behaviour to
+implement retries that are helping the server to recover faster in
+case of congestion.
+
+It can be used in several ways:
+- Using duration to get next sleep time.
+- Using ticker channel to trigger callback function on tick
+
+The functions for Backoff are not threadsafe, but you can:
+- Keep the attempt counter on your end and use durationForAttempt(int)
+- Use lock in your own code to protect the Backoff structure.
+
+TODO: Implement Backoff Ticker channel
+TODO: Implement throttler interface. Throttler could be used to implement various reconnect strategies.
+*/
+
+package xmpp
+
+import (
+	"math"
+	"math/rand"
+	"time"
+)
+
+const (
+	defaultBase   int = 20 // Backoff base, in ms
+	defaultFactor int = 2
+	defaultCap    int = 180000 // 3 minutes
+)
+
+// backoff provides increasing duration with the number of attempt
+// performed. The structure is used to support exponential backoff on
+// connection attempts to avoid hammering the server we are connecting
+// to.
+type backoff struct {
+	NoJitter     bool
+	Base         int
+	Factor       int
+	Cap          int
+	lastDuration int
+	attempt      int
+}
+
+// duration returns the duration to apply to the current attempt.
+func (b *backoff) duration() time.Duration {
+	d := b.durationForAttempt(b.attempt)
+	b.attempt++
+	return d
+}
+
+// wait sleeps for backoff duration for current attempt.
+func (b *backoff) wait() {
+	time.Sleep(b.duration())
+}
+
+// durationForAttempt returns a duration for an attempt number, in a stateless way.
+func (b *backoff) durationForAttempt(attempt int) time.Duration {
+	b.setDefault()
+	expBackoff := math.Min(float64(b.Cap), float64(b.Base)*math.Pow(float64(b.Factor), float64(b.attempt)))
+	d := int(math.Trunc(expBackoff))
+	if !b.NoJitter {
+		d = rand.Intn(d)
+	}
+	return time.Duration(d) * time.Millisecond
+}
+
+// reset sets back the number of attempts to 0. This is to be called after a successful operation has been performed,
+// to reset the exponential backoff interval.
+func (b *backoff) reset() {
+	b.attempt = 0
+}
+
+func (b *backoff) setDefault() {
+	if b.Base == 0 {
+		b.Base = defaultBase
+	}
+
+	if b.Cap == 0 {
+		b.Cap = defaultCap
+	}
+
+	if b.Factor == 0 {
+		b.Factor = defaultFactor
+	}
+}
+
+/*
+We use full jitter as default for now as it seems to provide good behaviour for reconnect.
+
+Base is the default interval between attempts (if backoff Factor was equal to 1)
+
+Attempt is the number of retry for operation. If we start attempt at 0, first sleep equals base.
+
+Cap is the maximum sleep time duration we tolerate between attempts
+*/

backoff_test.go

@@ -0,0 +1,22 @@
+package xmpp
+
+import (
+	"testing"
+	"time"
+)
+
+func TestDurationForAttempt_NoJitter(t *testing.T) {
+	b := backoff{Base: 25, NoJitter: true}
+	bInMS := time.Duration(b.Base) * time.Millisecond
+	if b.durationForAttempt(0) != bInMS {
+		t.Errorf("incorrect default duration for attempt #0 (%d) = %d", b.durationForAttempt(0)/time.Millisecond, bInMS/time.Millisecond)
+	}
+	var prevDuration, d time.Duration
+	for i := 0; i < 10; i++ {
+		d = b.durationForAttempt(i)
+		if !(d >= prevDuration) {
+			t.Errorf("duration should be increasing between attempts. #%d (%d) > %d", i, d, prevDuration)
+		}
+		prevDuration = d
+	}
+}

cert_checker.go

@@ -0,0 +1,148 @@
+package xmpp
+
+import (
+	"crypto/tls"
+	"encoding/xml"
+	"errors"
+	"fmt"
+	"net"
+	"strings"
+	"time"
+
+	"gosrc.io/xmpp/stanza"
+)
+
+// TODO: Should I move this as an extension of the client?
+//    I should probably make the code more modular, but keep concern separated to keep it simple.
+type ServerCheck struct {
+	address string
+	domain  string
+}
+
+func NewChecker(address, domain string) (*ServerCheck, error) {
+	client := ServerCheck{}
+
+	var err error
+	var host string
+	if client.address, host, err = extractParams(address); err != nil {
+		return &client, err
+	}
+
+	if domain != "" {
+		client.domain = domain
+	} else {
+		client.domain = host
+	}
+
+	return &client, nil
+}
+
+// Check triggers actual TCP connection, based on previously defined parameters.
+func (c *ServerCheck) Check() error {
+	var tcpconn net.Conn
+	var err error
+
+	timeout := 15 * time.Second
+	tcpconn, err = net.DialTimeout("tcp", c.address, timeout)
+	if err != nil {
+		return err
+	}
+
+	decoder := xml.NewDecoder(tcpconn)
+
+	// Send stream open tag
+	if _, err = fmt.Fprintf(tcpconn, xmppStreamOpen, c.domain, stanza.NSClient, stanza.NSStream); err != nil {
+		return err
+	}
+
+	// Set xml decoder and extract streamID from reply (not used for now)
+	_, err = stanza.InitStream(decoder)
+	if err != nil {
+		return err
+	}
+
+	// extract stream features
+	var f stanza.StreamFeatures
+	packet, err := stanza.NextPacket(decoder)
+	if err != nil {
+		err = fmt.Errorf("stream open decode features: %s", err)
+		return err
+	}
+
+	switch p := packet.(type) {
+	case stanza.StreamFeatures:
+		f = p
+	case stanza.StreamError:
+		return errors.New("open stream error: " + p.Error.Local)
+	default:
+		return errors.New("expected packet received while expecting features, got " + p.Name())
+	}
+
+	if _, ok := f.DoesStartTLS(); ok {
+		fmt.Fprintf(tcpconn, "<starttls xmlns='urn:ietf:params:xml:ns:xmpp-tls'/>")
+
+		var k stanza.TLSProceed
+		if err = decoder.DecodeElement(&k, nil); err != nil {
+			return fmt.Errorf("expecting starttls proceed: %s", err)
+		}
+
+		var tlsConfig tls.Config
+		tlsConfig.ServerName = c.domain
+		tlsConn := tls.Client(tcpconn, &tlsConfig)
+		// We convert existing connection to TLS
+		if err = tlsConn.Handshake(); err != nil {
+			return err
+		}
+
+		// We check that cert matches hostname
+		if err = tlsConn.VerifyHostname(c.domain); err != nil {
+			return err
+		}
+
+		if err = checkExpiration(tlsConn); err != nil {
+			return err
+		}
+		return nil
+	}
+	return errors.New("TLS not supported on server")
+}
+
+// Check expiration date for the whole certificate chain and returns an error
+// if the expiration date is in less than 48 hours.
+func checkExpiration(tlsConn *tls.Conn) error {
+	checkedCerts := make(map[string]struct{})
+	for _, chain := range tlsConn.ConnectionState().VerifiedChains {
+		for _, cert := range chain {
+			if _, checked := checkedCerts[string(cert.Signature)]; checked {
+				continue
+			}
+			checkedCerts[string(cert.Signature)] = struct{}{}
+
+			// Check the expiration.
+			timeNow := time.Now()
+			expiresInHours := int64(cert.NotAfter.Sub(timeNow).Hours())
+			// fmt.Printf("Cert '%s' expires in %d days\n", cert.Subject.CommonName, expiresInHours/24)
+			if expiresInHours <= 48 {
+				return fmt.Errorf("certificate '%s' will expire on %s", cert.Subject.CommonName, cert.NotAfter)
+			}
+		}
+	}
+	return nil
+}
+
+func extractParams(addr string) (string, string, error) {
+	var err error
+	hostport := strings.Split(addr, ":")
+	if len(hostport) > 2 {
+		err = errors.New("too many colons in xmpp server address")
+		return addr, hostport[0], err
+	}
+
+	// Address is composed of two parts, we are good
+	if len(hostport) == 2 && hostport[1] != "" {
+		return addr, hostport[0], err
+	}
+
+	// Port was not passed, we append XMPP default port:
+	return strings.Join([]string{hostport[0], "5222"}, ":"), hostport[0], err
+}

client.go

@@ -0,0 +1,288 @@
+package xmpp
+
+import (
+	"encoding/xml"
+	"errors"
+	"fmt"
+	"net"
+	"time"
+
+	"gosrc.io/xmpp/stanza"
+)
+
+//=============================================================================
+// EventManager
+
+// ConnState represents the current connection state.
+type ConnState = uint8
+
+// This is a the list of events happening on the connection that the
+// client can be notified about.
+const (
+	StateDisconnected ConnState = iota
+	StateConnected
+	StateSessionEstablished
+	StateStreamError
+)
+
+// Event is a structure use to convey event changes related to client state. This
+// is for example used to notify the client when the client get disconnected.
+type Event struct {
+	State       ConnState
+	Description string
+	StreamError string
+	SMState     SMState
+}
+
+// SMState holds Stream Management information regarding the session that can be
+// used to resume session after disconnect
+type SMState struct {
+	// Stream Management ID
+	Id string
+	// Inbound stanza count
+	Inbound uint
+	// TODO Store location for IP affinity
+	// TODO Store max and timestamp, to check if we should retry resumption or not
+}
+
+// EventHandler is use to pass events about state of the connection to
+// client implementation.
+type EventHandler func(Event)
+
+type EventManager struct {
+	// Store current state
+	CurrentState ConnState
+
+	// Callback used to propagate connection state changes
+	Handler EventHandler
+}
+
+func (em EventManager) updateState(state ConnState) {
+	em.CurrentState = state
+	if em.Handler != nil {
+		em.Handler(Event{State: em.CurrentState})
+	}
+}
+
+func (em EventManager) disconnected(state SMState) {
+	em.CurrentState = StateDisconnected
+	if em.Handler != nil {
+		em.Handler(Event{State: em.CurrentState, SMState: state})
+	}
+}
+
+func (em EventManager) streamError(error, desc string) {
+	em.CurrentState = StateStreamError
+	if em.Handler != nil {
+		em.Handler(Event{State: em.CurrentState, StreamError: error, Description: desc})
+	}
+}
+
+// Client
+// ============================================================================
+
+// Client is the main structure used to connect as a client on an XMPP
+// server.
+type Client struct {
+	// Store user defined options and states
+	config Config
+	// Session gather data that can be accessed by users of this library
+	Session *Session
+	// TCP level connection / can be replaced by a TLS session after starttls
+	conn net.Conn
+	// Router is used to dispatch packets
+	router *Router
+	// Track and broadcast connection state
+	EventManager
+}
+
+/*
+Setting up the client / Checking the parameters
+*/
+
+// NewClient generates a new XMPP client, based on Config passed as parameters.
+// If host is not specified, the DNS SRV should be used to find the host from the domainpart of the JID.
+// Default the port to 5222.
+func NewClient(config Config, r *Router) (c *Client, err error) {
+	// Parse JID
+	if config.parsedJid, err = NewJid(config.Jid); err != nil {
+		err = errors.New("missing jid")
+		return nil, NewConnError(err, true)
+	}
+
+	if config.Password == "" {
+		err = errors.New("missing password")
+		return nil, NewConnError(err, true)
+	}
+
+	// Fallback to jid domain
+	if config.Address == "" {
+		config.Address = config.parsedJid.Domain
+
+		// Fetch SRV DNS-Entries
+		_, srvEntries, err := net.LookupSRV("xmpp-client", "tcp", config.parsedJid.Domain)
+
+		if err == nil && len(srvEntries) > 0 {
+			// If we found matching DNS records, use the entry with highest weight
+			bestSrv := srvEntries[0]
+			for _, srv := range srvEntries {
+				if srv.Priority <= bestSrv.Priority && srv.Weight >= bestSrv.Weight {
+					bestSrv = srv
+					config.Address = ensurePort(srv.Target, int(srv.Port))
+				}
+			}
+		}
+	}
+	config.Address = ensurePort(config.Address, 5222)
+
+	c = new(Client)
+	c.config = config
+	c.router = r
+
+	if c.config.ConnectTimeout == 0 {
+		c.config.ConnectTimeout = 15 // 15 second as default
+	}
+
+	return
+}
+
+// Connect triggers actual TCP connection, based on previously defined parameters.
+// Connect simply triggers resumption, with an empty session state.
+func (c *Client) Connect() error {
+	var state SMState
+	return c.Resume(state)
+}
+
+// Resume attempts resuming  a Stream Managed session, based on the provided stream management
+// state.
+func (c *Client) Resume(state SMState) error {
+	var err error
+
+	c.conn, err = net.DialTimeout("tcp", c.config.Address, time.Duration(c.config.ConnectTimeout)*time.Second)
+	if err != nil {
+		return err
+	}
+	c.updateState(StateConnected)
+
+	// Client is ok, we now open XMPP session
+	if c.conn, c.Session, err = NewSession(c.conn, c.config, state); err != nil {
+		return err
+	}
+	c.updateState(StateSessionEstablished)
+
+	// Start the keepalive go routine
+	keepaliveQuit := make(chan struct{})
+	go keepalive(c.conn, keepaliveQuit)
+	// Start the receiver go routine
+	state = c.Session.SMState
+	go c.recv(state, keepaliveQuit)
+
+	// We're connected and can now receive and send messages.
+	//fmt.Fprintf(client.conn, "<presence xml:lang='en'><show>%s</show><status>%s</status></presence>", "chat", "Online")
+	// TODO: Do we always want to send initial presence automatically ?
+	// Do we need an option to avoid that or do we rely on client to send the presence itself ?
+	fmt.Fprintf(c.Session.streamLogger, "<presence/>")
+
+	return err
+}
+
+func (c *Client) Disconnect() {
+	_ = c.SendRaw("</stream:stream>")
+	// TODO: Add a way to wait for stream close acknowledgement from the server for clean disconnect
+	_ = c.conn.Close()
+}
+
+func (c *Client) SetHandler(handler EventHandler) {
+	c.Handler = handler
+}
+
+// Send marshals XMPP stanza and sends it to the server.
+func (c *Client) Send(packet stanza.Packet) error {
+	conn := c.conn
+	if conn == nil {
+		return errors.New("client is not connected")
+	}
+
+	data, err := xml.Marshal(packet)
+	if err != nil {
+		return errors.New("cannot marshal packet " + err.Error())
+	}
+
+	return c.sendWithLogger(string(data))
+}
+
+// SendRaw sends an XMPP stanza as a string to the server.
+// It can be invalid XML or XMPP content. In that case, the server will
+// disconnect the client. It is up to the user of this method to
+// carefully craft the XML content to produce valid XMPP.
+func (c *Client) SendRaw(packet string) error {
+	conn := c.conn
+	if conn == nil {
+		return errors.New("client is not connected")
+	}
+
+	return c.sendWithLogger(packet)
+}
+
+func (c *Client) sendWithLogger(packet string) error {
+	var err error
+	_, err = fmt.Fprintf(c.Session.streamLogger, packet)
+	return err
+}
+
+// ============================================================================
+// Go routines
+
+// Loop: Receive data from server
+func (c *Client) recv(state SMState, keepaliveQuit chan<- struct{}) (err error) {
+	for {
+		val, err := stanza.NextPacket(c.Session.decoder)
+		if err != nil {
+			close(keepaliveQuit)
+			c.disconnected(state)
+			return err
+		}
+
+		// Handle stream errors
+		switch packet := val.(type) {
+		case stanza.StreamError:
+			c.router.route(c, val)
+			close(keepaliveQuit)
+			c.streamError(packet.Error.Local, packet.Text)
+			return errors.New("stream error: " + packet.Error.Local)
+		// Process Stream management nonzas
+		case stanza.SMRequest:
+			answer := stanza.SMAnswer{XMLName: xml.Name{
+				Space: stanza.NSStreamManagement,
+				Local: "a",
+			}, H: state.Inbound}
+			c.Send(answer)
+		default:
+			state.Inbound++
+		}
+
+		c.router.route(c, val)
+	}
+}
+
+// Loop: send whitespace keepalive to server
+// This is use to keep the connection open, but also to detect connection loss
+// and trigger proper client connection shutdown.
+func keepalive(conn net.Conn, quit <-chan struct{}) {
+	// TODO: Make keepalive interval configurable
+	ticker := time.NewTicker(30 * time.Second)
+	for {
+		select {
+		case <-ticker.C:
+			if n, err := fmt.Fprintf(conn, "\n"); err != nil || n != 1 {
+				// When keep alive fails, we force close the connection. In all cases, the recv will also fail.
+				ticker.Stop()
+				_ = conn.Close()
+				return
+			}
+		case <-quit:
+			ticker.Stop()
+			return
+		}
+	}
+}

client_test.go

@@ -0,0 +1,281 @@
+package xmpp
+
+import (
+	"encoding/xml"
+	"errors"
+	"fmt"
+	"net"
+	"testing"
+	"time"
+
+	"gosrc.io/xmpp/stanza"
+)
+
+const (
+	// Default port is not standard XMPP port to avoid interfering
+	// with local running XMPP server
+	testXMPPAddress = "localhost:15222"
+
+	defaultTimeout = 2 * time.Second
+)
+
+func TestClient_Connect(t *testing.T) {
+	// Setup Mock server
+	mock := ServerMock{}
+	mock.Start(t, testXMPPAddress, handlerConnectSuccess)
+
+	// Test / Check result
+	config := Config{Address: testXMPPAddress, Jid: "test@localhost", Password: "test", Insecure: true}
+
+	var client *Client
+	var err error
+	router := NewRouter()
+	if client, err = NewClient(config, router); err != nil {
+		t.Errorf("connect create XMPP client: %s", err)
+	}
+
+	if err = client.Connect(); err != nil {
+		t.Errorf("XMPP connection failed: %s", err)
+	}
+
+	mock.Stop()
+}
+
+func TestClient_NoInsecure(t *testing.T) {
+	// Setup Mock server
+	mock := ServerMock{}
+	mock.Start(t, testXMPPAddress, handlerAbortTLS)
+
+	// Test / Check result
+	config := Config{Address: testXMPPAddress, Jid: "test@localhost", Password: "test"}
+
+	var client *Client
+	var err error
+	router := NewRouter()
+	if client, err = NewClient(config, router); err != nil {
+		t.Errorf("cannot create XMPP client: %s", err)
+	}
+
+	if err = client.Connect(); err == nil {
+		// When insecure is not allowed:
+		t.Errorf("should fail as insecure connection is not allowed and server does not support TLS")
+	}
+
+	mock.Stop()
+}
+
+// Check that the client is properly tracking features, as session negotiation progresses.
+func TestClient_FeaturesTracking(t *testing.T) {
+	// Setup Mock server
+	mock := ServerMock{}
+	mock.Start(t, testXMPPAddress, handlerAbortTLS)
+
+	// Test / Check result
+	config := Config{Address: testXMPPAddress, Jid: "test@localhost", Password: "test"}
+
+	var client *Client
+	var err error
+	router := NewRouter()
+	if client, err = NewClient(config, router); err != nil {
+		t.Errorf("cannot create XMPP client: %s", err)
+	}
+
+	if err = client.Connect(); err == nil {
+		// When insecure is not allowed:
+		t.Errorf("should fail as insecure connection is not allowed and server does not support TLS")
+	}
+
+	mock.Stop()
+}
+
+func TestClient_RFC3921Session(t *testing.T) {
+	// Setup Mock server
+	mock := ServerMock{}
+	mock.Start(t, testXMPPAddress, handlerConnectWithSession)
+
+	// Test / Check result
+	config := Config{Address: testXMPPAddress, Jid: "test@localhost", Password: "test", Insecure: true}
+
+	var client *Client
+	var err error
+	router := NewRouter()
+	if client, err = NewClient(config, router); err != nil {
+		t.Errorf("connect create XMPP client: %s", err)
+	}
+
+	if err = client.Connect(); err != nil {
+		t.Errorf("XMPP connection failed: %s", err)
+	}
+
+	mock.Stop()
+}
+
+//=============================================================================
+// Basic XMPP Server Mock Handlers.
+
+const serverStreamOpen = "<?xml version='1.0'?><stream:stream to='%s' id='%s' xmlns='%s' xmlns:stream='%s' version='1.0'>"
+
+// Test connection with a basic straightforward workflow
+func handlerConnectSuccess(t *testing.T, c net.Conn) {
+	decoder := xml.NewDecoder(c)
+	checkOpenStream(t, c, decoder)
+
+	sendStreamFeatures(t, c, decoder) // Send initial features
+	readAuth(t, decoder)
+	fmt.Fprintln(c, "<success xmlns=\"urn:ietf:params:xml:ns:xmpp-sasl\"/>")
+
+	checkOpenStream(t, c, decoder) // Reset stream
+	sendBindFeature(t, c, decoder) // Send post auth features
+	bind(t, c, decoder)
+}
+
+// We expect client will abort on TLS
+func handlerAbortTLS(t *testing.T, c net.Conn) {
+	decoder := xml.NewDecoder(c)
+	checkOpenStream(t, c, decoder)
+	sendStreamFeatures(t, c, decoder) // Send initial features
+}
+
+// Test connection with mandatory session (RFC-3921)
+func handlerConnectWithSession(t *testing.T, c net.Conn) {
+	decoder := xml.NewDecoder(c)
+	checkOpenStream(t, c, decoder)
+
+	sendStreamFeatures(t, c, decoder) // Send initial features
+	readAuth(t, decoder)
+	fmt.Fprintln(c, "<success xmlns=\"urn:ietf:params:xml:ns:xmpp-sasl\"/>")
+
+	checkOpenStream(t, c, decoder)    // Reset stream
+	sendRFC3921Feature(t, c, decoder) // Send post auth features
+	bind(t, c, decoder)
+	session(t, c, decoder)
+}
+
+func checkOpenStream(t *testing.T, c net.Conn, decoder *xml.Decoder) {
+	c.SetDeadline(time.Now().Add(defaultTimeout))
+	defer c.SetDeadline(time.Time{})
+
+	for { // TODO clean up. That for loop is not elegant and I prefer bounded recursion.
+		var token xml.Token
+		token, err := decoder.Token()
+		if err != nil {
+			t.Errorf("cannot read next token: %s", err)
+		}
+
+		switch elem := token.(type) {
+		// Wait for first startElement
+		case xml.StartElement:
+			if elem.Name.Space != stanza.NSStream || elem.Name.Local != "stream" {
+				err = errors.New("xmpp: expected <stream> but got <" + elem.Name.Local + "> in " + elem.Name.Space)
+				return
+			}
+			if _, err := fmt.Fprintf(c, serverStreamOpen, "localhost", "streamid1", stanza.NSClient, stanza.NSStream); err != nil {
+				t.Errorf("cannot write server stream open: %s", err)
+			}
+			return
+		}
+	}
+}
+
+func sendStreamFeatures(t *testing.T, c net.Conn, _ *xml.Decoder) {
+	// This is a basic server, supporting only 1 stream feature: SASL Plain Auth
+	features := `<stream:features>
+  <mechanisms xmlns="urn:ietf:params:xml:ns:xmpp-sasl">
+    <mechanism>PLAIN</mechanism>
+  </mechanisms>
+</stream:features>`
+	if _, err := fmt.Fprintln(c, features); err != nil {
+		t.Errorf("cannot send stream feature: %s", err)
+	}
+}
+
+// TODO return err in case of error reading the auth params
+func readAuth(t *testing.T, decoder *xml.Decoder) string {
+	se, err := stanza.NextStart(decoder)
+	if err != nil {
+		t.Errorf("cannot read auth: %s", err)
+		return ""
+	}
+
+	var nv interface{}
+	nv = &stanza.SASLAuth{}
+	// Decode element into pointer storage
+	if err = decoder.DecodeElement(nv, &se); err != nil {
+		t.Errorf("cannot decode auth: %s", err)
+		return ""
+	}
+
+	switch v := nv.(type) {
+	case *stanza.SASLAuth:
+		return v.Value
+	}
+	return ""
+}
+
+func sendBindFeature(t *testing.T, c net.Conn, _ *xml.Decoder) {
+	// This is a basic server, supporting only 1 stream feature after auth: resource binding
+	features := `<stream:features>
+  <bind xmlns='urn:ietf:params:xml:ns:xmpp-bind'/>
+</stream:features>`
+	if _, err := fmt.Fprintln(c, features); err != nil {
+		t.Errorf("cannot send stream feature: %s", err)
+	}
+}
+
+func sendRFC3921Feature(t *testing.T, c net.Conn, _ *xml.Decoder) {
+	// This is a basic server, supporting only 2 features after auth: resource & session binding
+	features := `<stream:features>
+  <bind xmlns='urn:ietf:params:xml:ns:xmpp-bind'/>
+  <session xmlns='urn:ietf:params:xml:ns:xmpp-session'/>
+</stream:features>`
+	if _, err := fmt.Fprintln(c, features); err != nil {
+		t.Errorf("cannot send stream feature: %s", err)
+	}
+}
+
+func bind(t *testing.T, c net.Conn, decoder *xml.Decoder) {
+	se, err := stanza.NextStart(decoder)
+	if err != nil {
+		t.Errorf("cannot read bind: %s", err)
+		return
+	}
+
+	iq := &stanza.IQ{}
+	// Decode element into pointer storage
+	if err = decoder.DecodeElement(&iq, &se); err != nil {
+		t.Errorf("cannot decode bind iq: %s", err)
+		return
+	}
+
+	// TODO Check all elements
+	switch iq.Payload.(type) {
+	case *stanza.Bind:
+		result := `<iq id='%s' type='result'>
+  <bind xmlns='urn:ietf:params:xml:ns:xmpp-bind'>
+  	<jid>%s</jid>
+  </bind>
+</iq>`
+		fmt.Fprintf(c, result, iq.Id, "test@localhost/test") // TODO use real JID
+	}
+}
+
+func session(t *testing.T, c net.Conn, decoder *xml.Decoder) {
+	se, err := stanza.NextStart(decoder)
+	if err != nil {
+		t.Errorf("cannot read session: %s", err)
+		return
+	}
+
+	iq := &stanza.IQ{}
+	// Decode element into pointer storage
+	if err = decoder.DecodeElement(&iq, &se); err != nil {
+		t.Errorf("cannot decode session iq: %s", err)
+		return
+	}
+
+	switch iq.Payload.(type) {
+	case *stanza.StreamSession:
+		result := `<iq id='%s' type='result'/>`
+		fmt.Fprintf(c, result, iq.Id)
+	}
+}

cmd/go.mod

@@ -0,0 +1,13 @@
+module gosrc.io/xmpp/cmd
+
+go 1.12
+
+require (
+	github.com/bdlm/log v0.1.19
+	github.com/bdlm/std v0.0.0-20180922040903-fd3b596111c7
+	github.com/spf13/cobra v0.0.5
+	github.com/spf13/viper v1.4.0
+	gosrc.io/xmpp v0.1.1
+)
+
+replace gosrc.io/xmpp => ./../

cmd/go.sum

@@ -0,0 +1,159 @@
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cmd/sendxmpp/README.md

@@ -0,0 +1,131 @@
+# sendXMPP
+
+sendxmpp is a tool to send messages from command-line.
+
+## Installation
+
+To install `sendxmpp` in your Go path:
+
+```
+$ go get -u gosrc.io/xmpp/cmd/sendxmpp
+```
+
+## Usage
+
+```
+$ sendxmpp --help
+Usage:
+  sendxmpp <recipient,> [message] [flags]
+
+Examples:
+sendxmpp to@chat.sum7.eu "Hello World!"
+
+Flags:
+      --addr string       host[:port]
+      --config string     config file (default is ~/.config/fluxxmpp.yml)
+  -h, --help              help for sendxmpp
+      --jid string        using jid (required)
+  -m, --muc               recipient is a muc (join it before sending messages)
+      --password string   using password for your jid (required)
+```
+
+
+## Examples
+
+Message from arguments:
+```bash
+$ sendxmpp to@example.org "Hello World!"
+ info client connected
+   ⇢  cmd.go:56 main.glob..func1.1
+   ⇢  2019-07-17T23:42:43.310+02:00
+ info send message
+   ⇢  muc=false text="Hello World!" to="to@example.org"
+   ⇢  send.go:31 main.send
+   ⇢  2019-07-17T23:42:43.310+02:00
+```
+
+Message from STDIN:
+```bash
+$  journalctl -f | sendxmpp to@example.org -
+ info client connected
+   ⇢  cmd.go:56 main.glob..func1.1
+   ⇢  2019-07-17T23:40:03.177+02:00
+ info send message
+   ⇢  muc=false text="-- Logs begin at Mon 2019-07-08 22:16:54 CEST. --" to="to@example.org"
+   ⇢  send.go:31 main.send
+   ⇢  2019-07-17T23:40:03.178+02:00
+ info send message
+   ⇢  muc=false text="Jul 17 23:36:46 RECHNERNAME systemd[755]: Started Fetch mails." to="to@example.org"
+   ⇢  send.go:31 main.send
+   ⇢  2019-07-17T23:40:03.178+02:00
+^C
+```
+
+
+Multiple recipients:
+```bash
+$ sendxmpp to1@example.org,to2@example.org "Multiple recipient"
+ info client connected
+   ⇢  cmd.go:56 main.glob..func1.1
+   ⇢  2019-07-17T23:47:57.650+02:00
+ info send message
+   ⇢  muc=false text="Multiple recipient" to="to1@example.org"
+   ⇢  send.go:31 main.send
+   ⇢  2019-07-17T23:47:57.651+02:00
+ info send message
+   ⇢  muc=false text="Multiple recipient" to="to2@example.org"
+   ⇢  send.go:31 main.send
+   ⇢  2019-07-17T23:47:57.652+02:00
+```
+
+Send to MUC:
+```bash
+journalctl -f | sendxmpp testit@conference.chat.sum7.eu - --muc
+ info client connected
+   ⇢  cmd.go:56 main.glob..func1.1
+   ⇢  2019-07-17T23:52:56.269+02:00
+ info send message
+   ⇢  muc=true text="-- Logs begin at Mon 2019-07-08 22:16:54 CEST. --" to="testit@conference.chat.sum7.eu"
+   ⇢  send.go:31 main.send
+   ⇢  2019-07-17T23:52:56.270+02:00
+ info send message
+   ⇢  muc=true text="Jul 17 23:48:58 RECHNERNAME systemd[755]: mail.service: Succeeded." to="testit@conference.chat.sum7.eu"
+   ⇢  send.go:31 main.send
+   ⇢  2019-07-17T23:52:56.277+02:00
+^C
+```
+
+### Authentification
+
+#### Configuration file
+
+In `/etc/`, `~/.config` and `.` (here).
+You could create the file name `fluxxmpp` with you favorite file extenion (e.g. `toml`, `yml`).
+
+e.g. ~/.config/fluxxmpp.toml
+```toml
+jid      = "bot@example.org"
+password = "secret"
+
+addr     = "example.com:5222"
+```
+
+#### Environment variables
+
+```bash
+export FLUXXMPP_JID='bot@example.org';
+export FLUXXMPP_PASSWORD='secret';
+
+export FLUXXMPP_ADDR='example.com:5222';
+
+sendxmpp to@example.org "Hello Welt";
+```
+
+#### Parameters
+
+Warning: This should not be used for production systems, as all users on the system
+can read the running processes, and their parameters (and thus the password).
+
+```bash
+sendxmpp to@example.org "Hello World!" --jid bot@example.org --password secret --addr example.com:5222;
+```

cmd/sendxmpp/TODO.md

@@ -0,0 +1,14 @@
+# TODO
+
+## Issues
+
+- Remove global variable (like mucToleave)
+- Does not report error when trying to connect to a non open port (for example localhost with no server running).
+
+## Features
+
+- configuration
+  - allow unencrypted
+  - skip tls verification
+- support muc and single user at same time
+- send html -> parse console colors to xhtml (is there a easy way or lib for it ?)

cmd/sendxmpp/cmd.go

@@ -0,0 +1,131 @@
+package main
+
+import (
+	"bufio"
+	"os"
+	"strings"
+	"sync"
+
+	"github.com/bdlm/log"
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
+
+	"gosrc.io/xmpp"
+)
+
+var configFile = ""
+
+// FIXME: Remove global variables
+var isMUCRecipient = false
+
+var cmd = &cobra.Command{
+	Use:     "sendxmpp <recipient,> [message]",
+	Example: `sendxmpp to@chat.sum7.eu "Hello World!"`,
+	Args:    cobra.ExactArgs(2),
+	Run:     sendxmpp,
+}
+
+func sendxmpp(cmd *cobra.Command, args []string) {
+	receiver := strings.Split(args[0], ",")
+	msgText := args[1]
+
+	var err error
+	client, err := xmpp.NewClient(xmpp.Config{
+		Jid:      viper.GetString("jid"),
+		Address:  viper.GetString("addr"),
+		Password: viper.GetString("password"),
+	}, xmpp.NewRouter())
+
+	if err != nil {
+		log.Errorf("error when starting xmpp client: %s", err)
+		return
+	}
+
+	wg := sync.WaitGroup{}
+	wg.Add(1)
+
+	// FIXME: Remove global variables
+	var mucsToLeave []*xmpp.Jid
+
+	cm := xmpp.NewStreamManager(client, func(c xmpp.Sender) {
+		defer wg.Done()
+
+		log.Info("client connected")
+
+		if isMUCRecipient {
+			for _, muc := range receiver {
+				jid, err := xmpp.NewJid(muc)
+				if err != nil {
+					log.WithField("muc", muc).Errorf("skipping invalid muc jid: %w", err)
+					continue
+				}
+				jid.Resource = "sendxmpp"
+
+				if err := joinMUC(c, jid); err != nil {
+					log.WithField("muc", muc).Errorf("error joining muc: %w", err)
+					continue
+				}
+				mucsToLeave = append(mucsToLeave, jid)
+			}
+		}
+
+		if msgText != "-" {
+			send(c, receiver, msgText)
+			return
+		}
+
+		scanner := bufio.NewScanner(os.Stdin)
+		for scanner.Scan() {
+			send(c, receiver, scanner.Text())
+		}
+
+		if err := scanner.Err(); err != nil {
+			log.Errorf("error on reading stdin: %s", err)
+		}
+	})
+	go func() {
+		err := cm.Run()
+		log.Panic("closed connection:", err)
+		wg.Done()
+	}()
+
+	wg.Wait()
+
+	leaveMUCs(client, mucsToLeave)
+}
+
+func init() {
+	cobra.OnInitialize(initConfig)
+	cmd.PersistentFlags().StringVar(&configFile, "config", "", "config file (default is ~/.config/fluxxmpp.yml)")
+
+	cmd.Flags().StringP("jid", "", "", "using jid (required)")
+	viper.BindPFlag("jid", cmd.Flags().Lookup("jid"))
+
+	cmd.Flags().StringP("password", "", "", "using password for your jid (required)")
+	viper.BindPFlag("password", cmd.Flags().Lookup("password"))
+
+	cmd.Flags().StringP("addr", "", "", "host[:port]")
+	viper.BindPFlag("addr", cmd.Flags().Lookup("addr"))
+
+	cmd.Flags().BoolVarP(&isMUCRecipient, "muc", "m", false, "recipient is a muc (join it before sending messages)")
+}
+
+// initConfig reads in config file and ENV variables if set.
+func initConfig() {
+	if configFile != "" {
+		viper.SetConfigFile(configFile)
+	}
+
+	viper.SetConfigName("fluxxmpp")
+	viper.AddConfigPath("/etc/")
+	viper.AddConfigPath("$HOME/.config")
+	viper.AddConfigPath(".")
+
+	viper.SetEnvPrefix("FLUXXMPP")
+	viper.AutomaticEnv()
+
+	// If a config file is found, read it in.
+	if err := viper.ReadInConfig(); err != nil {
+		log.Warnf("no configuration found (somebody could read your password from process argument list): %s", err)
+	}
+}

cmd/sendxmpp/doc.go

@@ -0,0 +1,6 @@
+/*
+
+sendxmpp is a command-line tool to send to send XMPP messages to users
+
+*/
+package main

cmd/sendxmpp/log.go

@@ -0,0 +1,34 @@
+package main
+
+import (
+	"os"
+
+	"github.com/bdlm/log"
+	stdLogger "github.com/bdlm/std/logger"
+)
+
+type hook struct{}
+
+func (h *hook) Fire(entry *log.Entry) error {
+	switch entry.Level {
+	case log.PanicLevel:
+		entry.Logger.Out = os.Stderr
+	case log.FatalLevel:
+		entry.Logger.Out = os.Stderr
+	case log.ErrorLevel:
+		entry.Logger.Out = os.Stderr
+	case log.WarnLevel:
+		entry.Logger.Out = os.Stdout
+	case log.InfoLevel:
+		entry.Logger.Out = os.Stdout
+	case log.DebugLevel:
+		entry.Logger.Out = os.Stdout
+	default:
+	}
+
+	return nil
+}
+
+func (h *hook) Levels() []stdLogger.Level {
+	return log.AllLevels
+}

cmd/sendxmpp/main.go

@@ -0,0 +1,12 @@
+package main
+
+import (
+	"github.com/bdlm/log"
+)
+
+func main() {
+	log.AddHook(&hook{})
+	if err := cmd.Execute(); err != nil {
+		log.Fatal(err)
+	}
+}

cmd/sendxmpp/muc.go

@@ -0,0 +1,28 @@
+package main
+
+import (
+	"github.com/bdlm/log"
+
+	"gosrc.io/xmpp"
+	"gosrc.io/xmpp/stanza"
+)
+
+func joinMUC(c xmpp.Sender, toJID *xmpp.Jid) error {
+	return c.Send(stanza.Presence{Attrs: stanza.Attrs{To: toJID.Full()},
+		Extensions: []stanza.PresExtension{
+			stanza.MucPresence{
+				History: stanza.History{MaxStanzas: stanza.NewNullableInt(0)},
+			}},
+	})
+}
+
+func leaveMUCs(c xmpp.Sender, mucsToLeave []*xmpp.Jid) {
+	for _, muc := range mucsToLeave {
+		if err := c.Send(stanza.Presence{Attrs: stanza.Attrs{
+			To:   muc.Full(),
+			Type: stanza.PresenceTypeUnavailable,
+		}}); err != nil {
+			log.WithField("muc", muc).Errorf("error on leaving muc: %s", err)
+		}
+	}
+}

cmd/sendxmpp/send.go

@@ -0,0 +1,36 @@
+package main
+
+import (
+	"github.com/bdlm/log"
+
+	"gosrc.io/xmpp"
+	"gosrc.io/xmpp/stanza"
+)
+
+func send(c xmpp.Sender, recipient []string, msgText string) {
+	msg := stanza.Message{
+		Attrs: stanza.Attrs{Type: stanza.MessageTypeChat},
+		Body:  msgText,
+	}
+
+	if isMUCRecipient {
+		msg.Type = stanza.MessageTypeGroupchat
+	}
+
+	for _, to := range recipient {
+		msg.To = to
+		if err := c.Send(msg); err != nil {
+			log.WithFields(map[string]interface{}{
+				"muc":  isMUCRecipient,
+				"to":   to,
+				"text": msgText,
+			}).Errorf("error on send message: %s", err)
+		} else {
+			log.WithFields(map[string]interface{}{
+				"muc":  isMUCRecipient,
+				"to":   to,
+				"text": msgText,
+			}).Info("send message")
+		}
+	}
+}

cmd/xmpp-check/README.md

@@ -0,0 +1,49 @@
+# XMPP Check
+
+XMPP check is a tool to check TLS certificate on a remote server.
+
+## Installation
+
+To install `xmpp-check` in your Go path:
+
+```
+$ go get -u gosrc.io/xmpp/cmd/xmpp-check
+```
+
+## Usage
+
+```
+$ xmpp-check --help
+Usage:
+  xmpp-check <host[:port]> [flags]
+
+Examples:
+xmpp-check chat.sum7.eu:5222 --domain meckerspace.de
+
+Flags:
+  -d, --domain string   domain if host handle multiple domains
+  -h, --help            help for xmpp-check
+```
+
+If you server is on standard port and XMPP domains matches the hostname you can simply use:
+
+```
+$ xmpp-check chat.sum7.eu
+ info All checks passed
+   ⇢  address="chat.sum7.eu" domain=""
+   ⇢  main.go:43 main.runCheck
+   ⇢  2019-07-16T22:01:39.765+02:00
+```
+
+You can also pass the port and the XMPP domain if different from the server hostname:
+
+```
+$ xmpp-check chat.sum7.eu:5222 --domain meckerspace.de
+ info All checks passed
+   ⇢  address="chat.sum7.eu:5222" domain="meckerspace.de"
+   ⇢  main.go:43 main.runCheck
+   ⇢  2019-07-16T22:01:33.270+02:00
+```
+
+Error code will be non-zero in case of error. You can thus use it directly with your usual 
+monitoring scripts.

cmd/xmpp-check/TODO.md

@@ -0,0 +1,3 @@
+# TODO
+
+- Use a config file to define the checks to perform as client on an XMPP server.

cmd/xmpp-check/doc.go

@@ -0,0 +1,6 @@
+/*
+
+xmpp-check is a command-line to check if you XMPP TLS certificate is valid and warn you before it expires.
+
+*/
+package main

cmd/xmpp-check/log.go

@@ -0,0 +1,34 @@
+package main
+
+import (
+	"os"
+
+	"github.com/bdlm/log"
+	stdLogger "github.com/bdlm/std/logger"
+)
+
+type hook struct{}
+
+func (h *hook) Fire(entry *log.Entry) error {
+	switch entry.Level {
+	case log.PanicLevel:
+		entry.Logger.Out = os.Stderr
+	case log.FatalLevel:
+		entry.Logger.Out = os.Stderr
+	case log.ErrorLevel:
+		entry.Logger.Out = os.Stderr
+	case log.WarnLevel:
+		entry.Logger.Out = os.Stdout
+	case log.InfoLevel:
+		entry.Logger.Out = os.Stdout
+	case log.DebugLevel:
+		entry.Logger.Out = os.Stdout
+	default:
+	}
+
+	return nil
+}
+
+func (h *hook) Levels() []stdLogger.Level {
+	return log.AllLevels
+}

cmd/xmpp-check/main.go

@@ -0,0 +1,44 @@
+package main
+
+import (
+	"github.com/bdlm/log"
+	"github.com/spf13/cobra"
+	"gosrc.io/xmpp"
+)
+
+func main() {
+	log.AddHook(&hook{})
+	cmd.Execute()
+}
+
+var domain = ""
+var cmd = &cobra.Command{
+	Use:     "xmpp-check <host[:port]>",
+	Example: "xmpp-check chat.sum7.eu:5222 --domain meckerspace.de",
+	Args:    cobra.ExactArgs(1),
+	Run: func(cmd *cobra.Command, args []string) {
+		runCheck(args[0], domain)
+	},
+}
+
+func init() {
+	cmd.Flags().StringVarP(&domain, "domain", "d", "", "domain if host handle multiple domains")
+}
+
+func runCheck(address, domain string) {
+	logger := log.WithFields(map[string]interface{}{
+		"address": address,
+		"domain":  domain,
+	})
+	client, err := xmpp.NewChecker(address, domain)
+
+	if err != nil {
+		log.Fatal("Error: ", err)
+	}
+
+	if err = client.Check(); err != nil {
+		logger.Fatal("Failed connection check: ", err)
+	}
+
+	logger.Println("All checks passed")
+}

codecov.yml

@@ -0,0 +1 @@
+comment: off

codeship-services.yml

@@ -0,0 +1,5 @@
+build:
+  build:
+    image: fluux/build
+    dockerfile: Dockerfile
+  encrypted_env_file: codeship.env.encrypted

codeship-steps.yml

@@ -0,0 +1,5 @@
+- type: serial
+  steps:
+  - name: test
+    service: build
+    command: ./test.sh

codeship.env.encrypted

@@ -0,0 +1 @@
+yVKgVFeKW6SSnC/KgLYpfYtTcqqTke1gOIW5GUiVvRijnhweOJiYKFPmwPjpt1FVrg4WVELQUNbxn3lmfyHVVF7r

component.go

@@ -0,0 +1,199 @@
+package xmpp
+
+import (
+	"crypto/sha1"
+	"encoding/hex"
+	"encoding/xml"
+	"errors"
+	"fmt"
+	"io"
+	"net"
+	"time"
+
+	"gosrc.io/xmpp/stanza"
+)
+
+const componentStreamOpen = "<?xml version='1.0'?><stream:stream to='%s' xmlns='%s' xmlns:stream='%s'>"
+
+type ComponentOptions struct {
+	// =================================
+	// Component Connection Info
+
+	// Domain is the XMPP server subdomain that the component will handle
+	Domain string
+	// Secret is the "password" used by the XMPP server to secure component access
+	Secret string
+	// Address is the XMPP Host and port to connect to. Host is of
+	// the form 'serverhost:port' i.e "localhost:8888"
+	Address string
+
+	// =================================
+	// Component discovery
+
+	// Component human readable name, that will be shown in XMPP discovery
+	Name string
+	// Typical categories and types: https://xmpp.org/registrar/disco-categories.html
+	Category string
+	Type     string
+
+	// =================================
+	// Communication with developer client / StreamManager
+
+	// Track and broadcast connection state
+	EventManager
+}
+
+// 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 {
+	ComponentOptions
+	router *Router
+
+	// TCP level connection
+	conn net.Conn
+
+	// read / write
+	socketProxy io.ReadWriter // TODO
+	decoder     *xml.Decoder
+}
+
+func NewComponent(opts ComponentOptions, r *Router) (*Component, error) {
+	c := Component{ComponentOptions: opts, router: r}
+	return &c, nil
+}
+
+// Connect triggers component connection to XMPP server component port.
+// TODO: Failed handshake should be a permanent error
+func (c *Component) Connect() error {
+	var conn net.Conn
+	var err error
+	if conn, err = net.DialTimeout("tcp", c.Address, time.Duration(5)*time.Second); err != nil {
+		return err
+	}
+	c.conn = conn
+
+	// 1. Send stream open tag
+	if _, err := fmt.Fprintf(conn, componentStreamOpen, c.Domain, stanza.NSComponent, stanza.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 := stanza.InitStream(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 := stanza.NextPacket(c.decoder)
+	if err != nil {
+		return err
+	}
+
+	switch v := val.(type) {
+	case stanza.StreamError:
+		return errors.New("handshake failed " + v.Error.Local)
+	case stanza.Handshake:
+		// Start the receiver go routine
+		go c.recv()
+		return nil
+	default:
+		return errors.New("expecting handshake result, got " + v.Name())
+	}
+}
+
+func (c *Component) Resume() error {
+	return errors.New("components do not support stream management")
+}
+
+func (c *Component) Disconnect() {
+	_ = c.SendRaw("</stream:stream>")
+	// TODO: Add a way to wait for stream close acknowledgement from the server for clean disconnect
+	_ = c.conn.Close()
+}
+
+func (c *Component) SetHandler(handler EventHandler) {
+	c.Handler = handler
+}
+
+// Receiver Go routine receiver
+func (c *Component) recv() (err error) {
+	for {
+		val, err := stanza.NextPacket(c.decoder)
+		if err != nil {
+			c.updateState(StateDisconnected)
+			return err
+		}
+
+		// Handle stream errors
+		switch p := val.(type) {
+		case stanza.StreamError:
+			c.router.route(c, val)
+			c.streamError(p.Error.Local, p.Text)
+			return errors.New("stream error: " + p.Error.Local)
+		}
+		c.router.route(c, val)
+	}
+}
+
+// Send marshalls XMPP stanza and sends it to the server.
+func (c *Component) Send(packet stanza.Packet) error {
+	conn := c.conn
+	if conn == nil {
+		return errors.New("component is not connected")
+	}
+
+	data, err := xml.Marshal(packet)
+	if err != nil {
+		return errors.New("cannot marshal packet " + err.Error())
+	}
+
+	if _, err := fmt.Fprintf(conn, string(data)); err != nil {
+		return errors.New("cannot send packet " + err.Error())
+	}
+	return nil
+}
+
+// SendRaw sends an XMPP stanza as a string to the server.
+// It can be invalid XML or XMPP content. In that case, the server will
+// disconnect the component. It is up to the user of this method to
+// carefully craft the XML content to produce valid XMPP.
+func (c *Component) SendRaw(packet string) error {
+	conn := c.conn
+	if conn == nil {
+		return errors.New("component is not connected")
+	}
+
+	var err error
+	_, err = fmt.Fprintf(c.conn, packet)
+	return err
+}
+
+// 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: Add support for discovery management directly in component
+TODO: Support multiple identities on disco info
+TODO: Support returning features on disco info
+*/

component_test.go

@@ -0,0 +1,25 @@
+package xmpp
+
+import (
+	"testing"
+)
+
+func TestHandshake(t *testing.T) {
+	opts := ComponentOptions{
+		Domain: "test.localhost",
+		Secret: "mypass",
+	}
+	c := Component{ComponentOptions: opts}
+
+	streamID := "1263952298440005243"
+	expected := "c77e2ef0109fbbc5161e83b51629cd1353495332"
+
+	result := c.handshake(streamID)
+	if result != expected {
+		t.Errorf("incorrect handshake calculation '%s' != '%s'", result, expected)
+	}
+}
+
+func TestGenerateHandshake(t *testing.T) {
+	// TODO
+}

config.go

@@ -0,0 +1,24 @@
+package xmpp
+
+import (
+	"crypto/tls"
+	"io"
+	"os"
+)
+
+type Config struct {
+	Address        string
+	Jid            string
+	parsedJid      *Jid // For easier manipulation
+	Password       string
+	StreamLogger   *os.File // Used for debugging
+	Lang           string   // TODO: should default to 'en'
+	ConnectTimeout int      // Client timeout in seconds. Default to 15
+	// tls.Config must not be modified after having been passed to NewClient. The
+	// Client connect method may override the tls.Config.ServerName if it was not set.
+	TLSConfig *tls.Config
+	// Insecure can be set to true to allow to open a session without TLS. If TLS
+	// is supported on the server, we will still try to use it.
+	Insecure      bool
+	CharsetReader func(charset string, input io.Reader) (io.Reader, error) // passed to xml decoder
+}

conn_error.go

@@ -0,0 +1,33 @@
+package xmpp
+
+import (
+	"fmt"
+
+	"golang.org/x/xerrors"
+)
+
+type ConnError struct {
+	frame xerrors.Frame
+	err   error
+	// Permanent will be true if error is not recoverable
+	Permanent bool
+}
+
+func NewConnError(err error, permanent bool) ConnError {
+	return ConnError{err: err, frame: xerrors.Caller(1), Permanent: permanent}
+}
+
+func (e ConnError) Format(s fmt.State, verb rune) {
+	xerrors.FormatError(e, s, verb)
+}
+
+func (e ConnError) FormatError(p xerrors.Printer) error {
+	e.frame.Format(p)
+	return e.err
+}
+
+func (e ConnError) Error() string {
+	return fmt.Sprint(e)
+}
+
+func (e ConnError) Unwrap() error { return e.err }

doc.go

@@ -0,0 +1,42 @@
+/*
+Fluux XMPP is an modern and full-featured XMPP library that can be used to build clients or
+server components.
+
+The goal is to make simple to write modern compliant XMPP software:
+
+ - For automation (like for example monitoring of an XMPP service),
+ - For building connected "things" by plugging them on an XMPP server,
+ - For writing simple chatbots to control a service or a thing.
+ - For writing XMPP servers components. Fluux XMPP supports:
+    - XEP-0114: Jabber Component Protocol
+    - XEP-0355: Namespace Delegation
+    - XEP-0356: Privileged Entity
+
+The library is designed to have minimal dependencies. For now, the library does not depend on any other library.
+
+The library includes a StreamManager that provides features like autoreconnect exponential back-off.
+
+The library is implementing latest versions of the XMPP specifications (RFC 6120 and RFC 6121), and includes
+support for many extensions.
+
+Clients
+
+Fluux XMPP can be use to create fully interactive XMPP clients (for
+example console-based), but it is more commonly used to build automated
+clients (connected devices, automation scripts, chatbots, etc.).
+
+Components
+
+XMPP components can typically be used to extends the features of an XMPP
+server, in a portable way, using component protocol over persistent TCP
+connections.
+
+Component protocol is defined in XEP-114 (https://xmpp.org/extensions/xep-0114.html).
+
+Compliance
+
+Fluux XMPP has been primarily tested with ejabberd (https://www.ejabberd.im)
+but it should work with any XMPP compliant server.
+
+*/
+package xmpp

go.mod

@@ -1,8 +1,8 @@
-module github.com/matterbridge/go-xmpp
+module gosrc.io/xmpp
 
-go 1.21.5
+go 1.12
 
 require (
-	golang.org/x/crypto v0.23.0
+	github.com/google/go-cmp v0.3.0
-	golang.org/x/net v0.25.0
+	golang.org/x/xerrors v0.0.0-20190513163551-3ee3066db522
 )

go.sum

@@ -1,4 +1,4 @@
-golang.org/x/crypto v0.23.0 h1:dIJU/v2J8Mdglj/8rJ6UUOM3Zc9zLZxVZwwxMooUSAI=
+github.com/google/go-cmp v0.3.0 h1:crn/baboCvb5fXaQ0IJ1SGTsTVrWpDsCWC8EGETZijY=
-golang.org/x/crypto v0.23.0/go.mod h1:CKFgDieR+mRhux2Lsu27y0fO304Db0wZe70UKqHu0v8=
+github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
-golang.org/x/net v0.25.0 h1:d/OCCoBEUq33pjydKrGQhw7IlUPI2Oylr+8qLx49kac=
+golang.org/x/xerrors v0.0.0-20190513163551-3ee3066db522 h1:bhOzK9QyoD0ogCnFro1m2mz41+Ib0oOhfJnBp5MR4K4=
-golang.org/x/net v0.25.0/go.mod h1:JkAGAh7GEvH74S6FOH42FLoXpXbE/aqXSrIQjXgsiwM=
+golang.org/x/xerrors v0.0.0-20190513163551-3ee3066db522/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=

jid.go

@@ -0,0 +1,91 @@
+package xmpp
+
+import (
+	"fmt"
+	"strings"
+	"unicode"
+)
+
+type Jid struct {
+	Node     string
+	Domain   string
+	Resource string
+}
+
+func NewJid(sjid string) (*Jid, error) {
+	jid := new(Jid)
+
+	if sjid == "" {
+		return jid, fmt.Errorf("jid cannot be empty")
+	}
+
+	s1 := strings.SplitN(sjid, "@", 2)
+	if len(s1) == 1 { // This is a server or component JID
+		jid.Domain = s1[0]
+	} else { // JID has a local username part
+		if s1[0] == "" {
+			return jid, fmt.Errorf("invalid jid '%s", sjid)
+		}
+		jid.Node = s1[0]
+		if s1[1] == "" {
+			return jid, fmt.Errorf("domain cannot be empty")
+		}
+		jid.Domain = s1[1]
+	}
+
+	// Extract resource from domain field
+	s2 := strings.SplitN(jid.Domain, "/", 2)
+	if len(s2) == 2 { // If len = 1, domain is already correct, and resource is already empty
+		jid.Domain = s2[0]
+		jid.Resource = s2[1]
+	}
+
+	if !isUsernameValid(jid.Node) {
+		return jid, fmt.Errorf("invalid Node in JID '%s'", sjid)
+	}
+	if !isDomainValid(jid.Domain) {
+		return jid, fmt.Errorf("invalid domain in JID '%s'", sjid)
+	}
+
+	return jid, nil
+}
+
+func (j *Jid) Full() string {
+	return j.Node + "@" + j.Domain + "/" + j.Resource
+}
+
+func (j *Jid) Bare() string {
+	return j.Node + "@" + j.Domain
+}
+
+// ============================================================================
+// Helpers, for parsing / validation
+
+func isUsernameValid(username string) bool {
+	invalidRunes := []rune{'@', '/', '\'', '"', ':', '<', '>'}
+	return strings.IndexFunc(username, isInvalid(invalidRunes)) < 0
+}
+
+func isDomainValid(domain string) bool {
+	if len(domain) == 0 {
+		return false
+	}
+
+	invalidRunes := []rune{'@', '/'}
+	return strings.IndexFunc(domain, isInvalid(invalidRunes)) < 0
+}
+
+func isInvalid(invalidRunes []rune) func(c rune) bool {
+	isInvalid := func(c rune) bool {
+		if unicode.IsSpace(c) {
+			return true
+		}
+		for _, r := range invalidRunes {
+			if c == r {
+				return true
+			}
+		}
+		return false
+	}
+	return isInvalid
+}

jid_test.go

@@ -0,0 +1,86 @@
+package xmpp
+
+import (
+	"testing"
+)
+
+func TestValidJids(t *testing.T) {
+	tests := []struct {
+		jidstr   string
+		expected Jid
+	}{
+		{jidstr: "test@domain.com", expected: Jid{"test", "domain.com", ""}},
+		{jidstr: "test@domain.com/resource", expected: Jid{"test", "domain.com", "resource"}},
+		// resource can contain '/' or '@'
+		{jidstr: "test@domain.com/a/b", expected: Jid{"test", "domain.com", "a/b"}},
+		{jidstr: "test@domain.com/a@b", expected: Jid{"test", "domain.com", "a@b"}},
+		{jidstr: "domain.com", expected: Jid{"", "domain.com", ""}},
+	}
+
+	for _, tt := range tests {
+		jid, err := NewJid(tt.jidstr)
+		if err != nil {
+			t.Errorf("could not parse correct jid: %s", tt.jidstr)
+			continue
+		}
+
+		if jid == nil {
+			t.Error("jid should not be nil")
+		}
+
+		if jid.Node != tt.expected.Node {
+			t.Errorf("incorrect jid Node (%s): %s", tt.expected.Node, jid.Node)
+		}
+
+		if jid.Node != tt.expected.Node {
+			t.Errorf("incorrect jid domain (%s): %s", tt.expected.Domain, jid.Domain)
+		}
+
+		if jid.Resource != tt.expected.Resource {
+			t.Errorf("incorrect jid resource (%s): %s", tt.expected.Resource, jid.Resource)
+		}
+	}
+}
+
+func TestIncorrectJids(t *testing.T) {
+	badJids := []string{
+		"",
+		"user@",
+		"@domain.com",
+		"user:name@domain.com",
+		"user<name@domain.com",
+		"test@domain.com@otherdomain.com",
+		"test@domain com/resource",
+	}
+
+	for _, sjid := range badJids {
+		if _, err := NewJid(sjid); err == nil {
+			t.Error("parsing incorrect jid should return error: " + sjid)
+		}
+	}
+}
+
+func TestFull(t *testing.T) {
+	jid := "test@domain.com/my resource"
+	parsedJid, err := NewJid(jid)
+	if err != nil {
+		t.Errorf("could not parse jid: %v", err)
+	}
+	fullJid := parsedJid.Full()
+	if fullJid != jid {
+		t.Errorf("incorrect full jid: %s", fullJid)
+	}
+}
+
+func TestBare(t *testing.T) {
+	jid := "test@domain.com"
+	fullJid := jid + "/my resource"
+	parsedJid, err := NewJid(fullJid)
+	if err != nil {
+		t.Errorf("could not parse jid: %v", err)
+	}
+	bareJid := parsedJid.Bare()
+	if bareJid != jid {
+		t.Errorf("incorrect bare jid: %s", bareJid)
+	}
+}

network.go

@@ -0,0 +1,32 @@
+package xmpp
+
+import (
+	"strconv"
+	"strings"
+)
+
+// ensurePort adds a port to an address if none are provided.
+// It handles both IPV4 and IPV6 addresses.
+func ensurePort(addr string, port int) string {
+	// This is an IPV6 address literal
+	if strings.HasPrefix(addr, "[") {
+		// if address has no port (behind his ipv6 address) - add default port
+		if strings.LastIndex(addr, ":") <= strings.LastIndex(addr, "]") {
+			return addr + ":" + strconv.Itoa(port)
+		}
+		return addr
+	}
+
+	// This is either an IPV6 address without bracket or an IPV4 address
+	switch strings.Count(addr, ":") {
+	case 0:
+		// This is IPV4 without port
+		return addr + ":" + strconv.Itoa(port)
+	case 1:
+		// This is IPV$ with port
+		return addr
+	default:
+		// This is IPV6 without port, as you need to use bracket with port in IPV6
+		return "[" + addr + "]:" + strconv.Itoa(port)
+	}
+}

network_test.go

@@ -0,0 +1,35 @@
+package xmpp
+
+import (
+	"testing"
+)
+
+type params struct {
+}
+
+func TestParseAddr(t *testing.T) {
+	tests := []struct {
+		name  string
+		input string
+		want  string
+	}{
+		{name: "ipv4-no-port-1", input: "localhost", want: "localhost:5222"},
+		{name: "ipv4-with-port-1", input: "localhost:5555", want: "localhost:5555"},
+		{name: "ipv4-no-port-2", input: "127.0.0.1", want: "127.0.0.1:5222"},
+		{name: "ipv4-with-port-2", input: "127.0.0.1:5555", want: "127.0.0.1:5555"},
+		{name: "ipv6-no-port-1", input: "::1", want: "[::1]:5222"},
+		{name: "ipv6-no-port-2", input: "[::1]", want: "[::1]:5222"},
+		{name: "ipv6-no-port-3", input: "2001::7334", want: "[2001::7334]:5222"},
+		{name: "ipv6-no-port-4", input: "2001:db8:85a3:0:0:8a2e:370:7334", want: "[2001:db8:85a3:0:0:8a2e:370:7334]:5222"},
+		{name: "ipv6-with-port-1", input: "[::1]:5555", want: "[::1]:5555"},
+	}
+	for _, tc := range tests {
+		t.Run(tc.name, func(st *testing.T) {
+			addr := ensurePort(tc.input, 5222)
+
+			if addr != tc.want {
+				st.Errorf("incorrect Result: %v (!= %v)", addr, tc.want)
+			}
+		})
+	}
+}

router.go

@@ -0,0 +1,258 @@
+package xmpp
+
+import (
+	"encoding/xml"
+	"strings"
+
+	"gosrc.io/xmpp/stanza"
+)
+
+/*
+The XMPP router helps client and component developers select which XMPP they would like to process,
+and associate processing code depending on the router configuration.
+
+Here are important rules to keep in mind while setting your routes and matchers:
+- Routes are evaluated in the order they are set.
+- When a route matches, it is executed and all others routes are ignored. For each packet, only a single
+  route is executed.
+- An empty route will match everything. Adding an empty route as the last route in your router will
+  allow you to get all stanzas that did not match any previous route. You can for example use this to
+  log all unexpected stanza received by your client or component.
+
+TODO: Automatically reply to IQ that do not match any route, to comply to XMPP standard.
+*/
+
+type Router struct {
+	// Routes to be matched, in order.
+	routes []*Route
+}
+
+// NewRouter returns a new router instance.
+func NewRouter() *Router {
+	return &Router{}
+}
+
+// route is called by the XMPP client to dispatch stanza received using the set up routes.
+// It is also used by test, but is not supposed to be used directly by users of the library.
+func (r *Router) route(s Sender, p stanza.Packet) {
+
+	var match RouteMatch
+	if r.Match(p, &match) {
+		// If we match, route the packet
+		match.Handler.HandlePacket(s, p)
+		return
+	}
+	// If there is no match and we receive an iq set or get, we need to send a reply
+	if iq, ok := p.(stanza.IQ); ok {
+		if iq.Type == stanza.IQTypeGet || iq.Type == stanza.IQTypeSet {
+			iqNotImplemented(s, iq)
+		}
+	}
+}
+
+func iqNotImplemented(s Sender, iq stanza.IQ) {
+	err := stanza.Err{
+		XMLName: xml.Name{Local: "error"},
+		Code:    501,
+		Type:    "cancel",
+		Reason:  "feature-not-implemented",
+	}
+	reply := iq.MakeError(err)
+	_ = s.Send(reply)
+}
+
+// NewRoute registers an empty routes
+func (r *Router) NewRoute() *Route {
+	route := &Route{}
+	r.routes = append(r.routes, route)
+	return route
+}
+
+func (r *Router) Match(p stanza.Packet, match *RouteMatch) bool {
+	for _, route := range r.routes {
+		if route.Match(p, match) {
+			return true
+		}
+	}
+	return false
+}
+
+// Handle registers a new route with a matcher for a given packet name (iq, message, presence)
+// See Route.Packet() and Route.Handler().
+func (r *Router) Handle(name string, handler Handler) *Route {
+	return r.NewRoute().Packet(name).Handler(handler)
+}
+
+// HandleFunc registers a new route with a matcher for for a given packet name (iq, message, presence)
+// See Route.Path() and Route.HandlerFunc().
+func (r *Router) HandleFunc(name string, f func(s Sender, p stanza.Packet)) *Route {
+	return r.NewRoute().Packet(name).HandlerFunc(f)
+}
+
+// ============================================================================
+// Route
+type Handler interface {
+	HandlePacket(s Sender, p stanza.Packet)
+}
+
+type Route struct {
+	handler Handler
+	// Matchers are used to "specialize" routes and focus on specific packet features
+	matchers []matcher
+}
+
+func (r *Route) Handler(handler Handler) *Route {
+	r.handler = handler
+	return r
+}
+
+// The HandlerFunc type is an adapter to allow the use of
+// ordinary functions as XMPP handlers. If f is a function
+// with the appropriate signature, HandlerFunc(f) is a
+// Handler that calls f.
+type HandlerFunc func(s Sender, p stanza.Packet)
+
+// HandlePacket calls f(s, p)
+func (f HandlerFunc) HandlePacket(s Sender, p stanza.Packet) {
+	f(s, p)
+}
+
+// HandlerFunc sets a handler function for the route
+func (r *Route) HandlerFunc(f HandlerFunc) *Route {
+	return r.Handler(f)
+}
+
+// addMatcher adds a matcher to the route
+func (r *Route) addMatcher(m matcher) *Route {
+	r.matchers = append(r.matchers, m)
+	return r
+}
+
+func (r *Route) Match(p stanza.Packet, match *RouteMatch) bool {
+	for _, m := range r.matchers {
+		if matched := m.Match(p, match); !matched {
+			return false
+		}
+	}
+
+	// We have a match, let's pass info route match info
+	match.Route = r
+	match.Handler = r.handler
+	return true
+}
+
+// --------------------
+// Match on packet name
+
+type nameMatcher string
+
+func (n nameMatcher) Match(p stanza.Packet, match *RouteMatch) bool {
+	var name string
+	// TODO: To avoid type switch everywhere in matching, I think we will need to have
+	//    to move to a concrete type for packets, to make matching and comparison more natural.
+	//    Current code structure is probably too rigid.
+	// Maybe packet types should even be from an enum.
+	switch p.(type) {
+	case stanza.Message:
+		name = "message"
+	case stanza.IQ:
+		name = "iq"
+	case stanza.Presence:
+		name = "presence"
+	}
+	if name == string(n) {
+		return true
+	}
+	return false
+}
+
+// Packet matches on a packet name (iq, message, presence, ...)
+// It matches on the Local part of the xml.Name
+func (r *Route) Packet(name string) *Route {
+	name = strings.ToLower(name)
+	return r.addMatcher(nameMatcher(name))
+}
+
+// -------------------------
+// Match on stanza type
+
+// nsTypeMather matches on a list of IQ  payload namespaces
+type nsTypeMatcher []string
+
+func (m nsTypeMatcher) Match(p stanza.Packet, match *RouteMatch) bool {
+	var stanzaType stanza.StanzaType
+	switch packet := p.(type) {
+	case stanza.IQ:
+		stanzaType = packet.Type
+	case stanza.Presence:
+		stanzaType = packet.Type
+	case stanza.Message:
+		if packet.Type == "" {
+			// optional on message, normal is the default type
+			stanzaType = "normal"
+		} else {
+			stanzaType = packet.Type
+		}
+	default:
+		return false
+	}
+	return matchInArray(m, string(stanzaType))
+}
+
+// IQNamespaces adds an IQ matcher, expecting both an IQ and a
+func (r *Route) StanzaType(types ...string) *Route {
+	for k, v := range types {
+		types[k] = strings.ToLower(v)
+	}
+	return r.addMatcher(nsTypeMatcher(types))
+}
+
+// -------------------------
+// Match on IQ and namespace
+
+// nsIqMather matches on a list of IQ  payload namespaces
+type nsIQMatcher []string
+
+func (m nsIQMatcher) Match(p stanza.Packet, match *RouteMatch) bool {
+	iq, ok := p.(stanza.IQ)
+	if !ok {
+		return false
+	}
+	if iq.Payload == nil {
+		return false
+	}
+	return matchInArray(m, iq.Payload.Namespace())
+}
+
+// IQNamespaces adds an IQ matcher, expecting both an IQ and a
+func (r *Route) IQNamespaces(namespaces ...string) *Route {
+	for k, v := range namespaces {
+		namespaces[k] = strings.ToLower(v)
+	}
+	return r.addMatcher(nsIQMatcher(namespaces))
+}
+
+// ============================================================================
+// Matchers
+
+// Matchers are used to "specialize" routes and focus on specific packet features
+type matcher interface {
+	Match(stanza.Packet, *RouteMatch) bool
+}
+
+// RouteMatch extracts and gather match information
+type RouteMatch struct {
+	Route   *Route
+	Handler Handler
+}
+
+// matchInArray is a generic matching function to check if a string is a list
+// of specific function
+func matchInArray(arr []string, value string) bool {
+	for _, str := range arr {
+		if str == value {
+			return true
+		}
+	}
+	return false
+}

router_test.go

@@ -0,0 +1,252 @@
+package xmpp
+
+import (
+	"bytes"
+	"encoding/xml"
+	"testing"
+
+	"gosrc.io/xmpp/stanza"
+)
+
+// ============================================================================
+// Test route & matchers
+
+func TestNameMatcher(t *testing.T) {
+	router := NewRouter()
+	router.HandleFunc("message", func(s Sender, p stanza.Packet) {
+		_ = s.SendRaw(successFlag)
+	})
+
+	// Check that a message packet is properly matched
+	conn := NewSenderMock()
+	msg := stanza.NewMessage(stanza.Attrs{Type: stanza.MessageTypeChat, To: "test@localhost", Id: "1"})
+	msg.Body = "Hello"
+	router.route(conn, msg)
+	if conn.String() != successFlag {
+		t.Error("Message was not matched and routed properly")
+	}
+
+	// Check that an IQ packet is not matched
+	conn = NewSenderMock()
+	iq := stanza.NewIQ(stanza.Attrs{Type: stanza.IQTypeGet, To: "localhost", Id: "1"})
+	iq.Payload = &stanza.DiscoInfo{}
+	router.route(conn, iq)
+	if conn.String() == successFlag {
+		t.Error("IQ should not have been matched and routed")
+	}
+}
+
+func TestIQNSMatcher(t *testing.T) {
+	router := NewRouter()
+	router.NewRoute().
+		IQNamespaces(stanza.NSDiscoInfo, stanza.NSDiscoItems).
+		HandlerFunc(func(s Sender, p stanza.Packet) {
+			_ = s.SendRaw(successFlag)
+		})
+
+	// Check that an IQ with proper namespace does match
+	conn := NewSenderMock()
+	iqDisco := stanza.NewIQ(stanza.Attrs{Type: stanza.IQTypeGet, To: "localhost", Id: "1"})
+	// TODO: Add a function to generate payload with proper namespace initialisation
+	iqDisco.Payload = &stanza.DiscoInfo{
+		XMLName: xml.Name{
+			Space: stanza.NSDiscoInfo,
+			Local: "query",
+		}}
+	router.route(conn, iqDisco)
+	if conn.String() != successFlag {
+		t.Errorf("IQ should have been matched and routed: %v", iqDisco)
+	}
+
+	// Check that another namespace is not matched
+	conn = NewSenderMock()
+	iqVersion := stanza.NewIQ(stanza.Attrs{Type: stanza.IQTypeGet, To: "localhost", Id: "1"})
+	// TODO: Add a function to generate payload with proper namespace initialisation
+	iqVersion.Payload = &stanza.DiscoInfo{
+		XMLName: xml.Name{
+			Space: "jabber:iq:version",
+			Local: "query",
+		}}
+	router.route(conn, iqVersion)
+	if conn.String() == successFlag {
+		t.Errorf("IQ should not have been matched and routed: %v", iqVersion)
+	}
+}
+
+func TestTypeMatcher(t *testing.T) {
+	router := NewRouter()
+	router.NewRoute().
+		StanzaType("normal").
+		HandlerFunc(func(s Sender, p stanza.Packet) {
+			_ = s.SendRaw(successFlag)
+		})
+
+	// Check that a packet with the proper type matches
+	conn := NewSenderMock()
+	message := stanza.NewMessage(stanza.Attrs{Type: "normal", To: "test@localhost", Id: "1"})
+	message.Body = "hello"
+	router.route(conn, message)
+
+	if conn.String() != successFlag {
+		t.Errorf("'normal' message should have been matched and routed: %v", message)
+	}
+
+	// We should match on default type 'normal' for message without a type
+	conn = NewSenderMock()
+	message = stanza.NewMessage(stanza.Attrs{To: "test@localhost", Id: "1"})
+	message.Body = "hello"
+	router.route(conn, message)
+
+	if conn.String() != successFlag {
+		t.Errorf("message should have been matched and routed: %v", message)
+	}
+
+	// We do not match on other types
+	conn = NewSenderMock()
+	iqVersion := stanza.NewIQ(stanza.Attrs{Type: "get", From: "service.localhost", To: "test@localhost", Id: "1"})
+	iqVersion.Payload = &stanza.DiscoInfo{
+		XMLName: xml.Name{
+			Space: "jabber:iq:version",
+			Local: "query",
+		}}
+	router.route(conn, iqVersion)
+
+	if conn.String() == successFlag {
+		t.Errorf("iq get should not have been matched and routed: %v", iqVersion)
+	}
+}
+
+func TestCompositeMatcher(t *testing.T) {
+	router := NewRouter()
+	router.NewRoute().
+		IQNamespaces("jabber:iq:version").
+		StanzaType("get").
+		HandlerFunc(func(s Sender, p stanza.Packet) {
+			_ = s.SendRaw(successFlag)
+		})
+
+	// Data set
+	getVersionIq := stanza.NewIQ(stanza.Attrs{Type: "get", From: "service.localhost", To: "test@localhost", Id: "1"})
+	getVersionIq.Payload = &stanza.Version{
+		XMLName: xml.Name{
+			Space: "jabber:iq:version",
+			Local: "query",
+		}}
+
+	setVersionIq := stanza.NewIQ(stanza.Attrs{Type: "set", From: "service.localhost", To: "test@localhost", Id: "1"})
+	setVersionIq.Payload = &stanza.Version{
+		XMLName: xml.Name{
+			Space: "jabber:iq:version",
+			Local: "query",
+		}}
+
+	GetDiscoIq := stanza.NewIQ(stanza.Attrs{Type: "get", From: "service.localhost", To: "test@localhost", Id: "1"})
+	GetDiscoIq.Payload = &stanza.DiscoInfo{
+		XMLName: xml.Name{
+			Space: "http://jabber.org/protocol/disco#info",
+			Local: "query",
+		}}
+
+	message := stanza.NewMessage(stanza.Attrs{Type: "normal", To: "test@localhost", Id: "1"})
+	message.Body = "hello"
+
+	tests := []struct {
+		name  string
+		input stanza.Packet
+		want  bool
+	}{
+		{name: "match get version iq", input: getVersionIq, want: true},
+		{name: "ignore set version iq", input: setVersionIq, want: false},
+		{name: "ignore get discoinfo iq", input: GetDiscoIq, want: false},
+		{name: "ignore message", input: message, want: false},
+	}
+
+	//
+	for _, tc := range tests {
+		t.Run(tc.name, func(st *testing.T) {
+			conn := NewSenderMock()
+			router.route(conn, tc.input)
+
+			res := conn.String() == successFlag
+			if tc.want != res {
+				st.Errorf("incorrect result for %#v\nMatch = %#v, expecting %#v", tc.input, res, tc.want)
+			}
+		})
+	}
+}
+
+// A blank route with empty matcher will always match
+// It can be use to receive all packets that do not match any of the previous route.
+func TestCatchallMatcher(t *testing.T) {
+	router := NewRouter()
+	router.NewRoute().
+		HandlerFunc(func(s Sender, p stanza.Packet) {
+			_ = s.SendRaw(successFlag)
+		})
+
+	// Check that we match on several packets
+	conn := NewSenderMock()
+	message := stanza.NewMessage(stanza.Attrs{Type: "chat", To: "test@localhost", Id: "1"})
+	message.Body = "hello"
+	router.route(conn, message)
+
+	if conn.String() != successFlag {
+		t.Errorf("chat message should have been matched and routed: %v", message)
+	}
+
+	conn = NewSenderMock()
+	iqVersion := stanza.NewIQ(stanza.Attrs{Type: "get", From: "service.localhost", To: "test@localhost", Id: "1"})
+	iqVersion.Payload = &stanza.DiscoInfo{
+		XMLName: xml.Name{
+			Space: "jabber:iq:version",
+			Local: "query",
+		}}
+	router.route(conn, iqVersion)
+
+	if conn.String() != successFlag {
+		t.Errorf("iq get should have been matched and routed: %v", iqVersion)
+	}
+}
+
+// ============================================================================
+// SenderMock
+
+var successFlag = "matched"
+
+type SenderMock struct {
+	buffer *bytes.Buffer
+}
+
+func NewSenderMock() SenderMock {
+	return SenderMock{buffer: new(bytes.Buffer)}
+}
+
+func (s SenderMock) Send(packet stanza.Packet) error {
+	out, err := xml.Marshal(packet)
+	if err != nil {
+		return err
+	}
+	s.buffer.Write(out)
+	return nil
+}
+
+func (s SenderMock) SendRaw(str string) error {
+	s.buffer.WriteString(str)
+	return nil
+}
+
+func (s SenderMock) String() string {
+	return s.buffer.String()
+}
+
+func TestSenderMock(t *testing.T) {
+	conn := NewSenderMock()
+	msg := stanza.NewMessage(stanza.Attrs{To: "test@localhost", Id: "1"})
+	msg.Body = "Hello"
+	if err := conn.Send(msg); err != nil {
+		t.Error("Could not send message")
+	}
+	if conn.String() != "<message id=\"1\" to=\"test@localhost\"><body>Hello</body></message>" {
+		t.Errorf("Incorrect packet sent: %s", conn.String())
+	}
+}

session.go

@@ -0,0 +1,279 @@
+package xmpp
+
+import (
+	"crypto/tls"
+	"encoding/xml"
+	"errors"
+	"fmt"
+	"io"
+	"net"
+
+	"gosrc.io/xmpp/stanza"
+)
+
+const xmppStreamOpen = "<?xml version='1.0'?><stream:stream to='%s' xmlns='%s' xmlns:stream='%s' version='1.0'>"
+
+type Session struct {
+	// Session info
+	BindJid      string // Jabber ID as provided by XMPP server
+	StreamId     string
+	SMState      SMState
+	Features     stanza.StreamFeatures
+	TlsEnabled   bool
+	lastPacketId int
+
+	// read / write
+	streamLogger io.ReadWriter
+	decoder      *xml.Decoder
+
+	// error management
+	err error
+}
+
+func NewSession(conn net.Conn, o Config, state SMState) (net.Conn, *Session, error) {
+	s := new(Session)
+	s.SMState = state
+	s.init(conn, o)
+
+	// starttls
+	var tlsConn net.Conn
+	tlsConn = s.startTlsIfSupported(conn, o.parsedJid.Domain, o)
+
+	if s.err != nil {
+		return nil, nil, NewConnError(s.err, true)
+	}
+
+	if !s.TlsEnabled && !o.Insecure {
+		err := fmt.Errorf("failed to negotiate TLS session : %s", s.err)
+		return nil, nil, NewConnError(err, true)
+	}
+
+	if s.TlsEnabled {
+		s.reset(conn, tlsConn, o)
+	}
+
+	// auth
+	s.auth(o)
+	s.reset(tlsConn, tlsConn, o)
+
+	// attempt resumption
+	if s.resume(o) {
+		return tlsConn, s, s.err
+	}
+
+	// otherwise, bind resource and 'start' XMPP session
+	s.bind(o)
+	s.rfc3921Session(o)
+
+	// Enable stream management if supported
+	s.EnableStreamManagement(o)
+
+	return tlsConn, s, s.err
+}
+
+func (s *Session) PacketId() string {
+	s.lastPacketId++
+	return fmt.Sprintf("%x", s.lastPacketId)
+}
+
+func (s *Session) init(conn net.Conn, o Config) {
+	s.setStreamLogger(nil, conn, o)
+	s.Features = s.open(o.parsedJid.Domain)
+}
+
+func (s *Session) reset(conn net.Conn, newConn net.Conn, o Config) {
+	if s.err != nil {
+		return
+	}
+
+	s.setStreamLogger(conn, newConn, o)
+	s.Features = s.open(o.parsedJid.Domain)
+}
+
+func (s *Session) setStreamLogger(conn net.Conn, newConn net.Conn, o Config) {
+	if newConn != conn {
+		s.streamLogger = newStreamLogger(newConn, o.StreamLogger)
+	}
+	s.decoder = xml.NewDecoder(s.streamLogger)
+	s.decoder.CharsetReader = o.CharsetReader
+}
+
+func (s *Session) open(domain string) (f stanza.StreamFeatures) {
+	// Send stream open tag
+	if _, s.err = fmt.Fprintf(s.streamLogger, xmppStreamOpen, domain, stanza.NSClient, stanza.NSStream); s.err != nil {
+		return
+	}
+
+	// Set xml decoder and extract streamID from reply
+	s.StreamId, s.err = stanza.InitStream(s.decoder) // TODO refactor / rename
+	if s.err != nil {
+		return
+	}
+
+	// extract stream features
+	if s.err = s.decoder.Decode(&f); s.err != nil {
+		s.err = errors.New("stream open decode features: " + s.err.Error())
+	}
+	return
+}
+
+func (s *Session) startTlsIfSupported(conn net.Conn, domain string, o Config) net.Conn {
+	if s.err != nil {
+		return conn
+	}
+
+	if _, ok := s.Features.DoesStartTLS(); ok {
+		fmt.Fprintf(s.streamLogger, "<starttls xmlns='urn:ietf:params:xml:ns:xmpp-tls'/>")
+
+		var k stanza.TLSProceed
+		if s.err = s.decoder.DecodeElement(&k, nil); s.err != nil {
+			s.err = errors.New("expecting starttls proceed: " + s.err.Error())
+			return conn
+		}
+
+		if o.TLSConfig == nil {
+			o.TLSConfig = &tls.Config{}
+		}
+
+		if o.TLSConfig.ServerName == "" {
+			o.TLSConfig.ServerName = domain
+		}
+		tlsConn := tls.Client(conn, o.TLSConfig)
+		// We convert existing connection to TLS
+		if s.err = tlsConn.Handshake(); s.err != nil {
+			return tlsConn
+		}
+
+		if !o.TLSConfig.InsecureSkipVerify {
+			s.err = tlsConn.VerifyHostname(domain)
+		}
+
+		if s.err == nil {
+			s.TlsEnabled = true
+		}
+		return tlsConn
+	}
+
+	// If we do not allow cleartext connections, make it explicit that server do not support starttls
+	if !o.Insecure {
+		s.err = errors.New("XMPP server does not advertise support for starttls")
+	}
+
+	// starttls is not supported => we do not upgrade the connection:
+	return conn
+}
+
+func (s *Session) auth(o Config) {
+	if s.err != nil {
+		return
+	}
+
+	s.err = authSASL(s.streamLogger, s.decoder, s.Features, o.parsedJid.Node, o.Password)
+}
+
+// Attempt to resume session using stream management
+func (s *Session) resume(o Config) bool {
+	if !s.Features.DoesStreamManagement() {
+		return false
+	}
+	if s.SMState.Id == "" {
+		return false
+	}
+
+	fmt.Fprintf(s.streamLogger, "<resume xmlns='%s' h='%d' previd='%s'/>",
+		stanza.NSStreamManagement, s.SMState.Inbound, s.SMState.Id)
+
+	var packet stanza.Packet
+	packet, s.err = stanza.NextPacket(s.decoder)
+	if s.err == nil {
+		switch p := packet.(type) {
+		case stanza.SMResumed:
+			if p.PrevId != s.SMState.Id {
+				s.err = errors.New("session resumption: mismatched id")
+				s.SMState = SMState{}
+				return false
+			}
+			return true
+		case stanza.SMFailed:
+		default:
+			s.err = errors.New("unexpected reply to SM resume")
+		}
+	}
+	s.SMState = SMState{}
+	return false
+}
+
+func (s *Session) bind(o Config) {
+	if s.err != nil {
+		return
+	}
+
+	// Send IQ message asking to bind to the local user name.
+	var resource = o.parsedJid.Resource
+	if resource != "" {
+		fmt.Fprintf(s.streamLogger, "<iq type='set' id='%s'><bind xmlns='%s'><resource>%s</resource></bind></iq>",
+			s.PacketId(), stanza.NSBind, resource)
+	} else {
+		fmt.Fprintf(s.streamLogger, "<iq type='set' id='%s'><bind xmlns='%s'/></iq>", s.PacketId(), stanza.NSBind)
+	}
+
+	var iq stanza.IQ
+	if s.err = s.decoder.Decode(&iq); s.err != nil {
+		s.err = errors.New("error decoding iq bind result: " + s.err.Error())
+		return
+	}
+
+	// TODO Check all elements
+	switch payload := iq.Payload.(type) {
+	case *stanza.Bind:
+		s.BindJid = payload.Jid // our local id (with possibly randomly generated resource
+	default:
+		s.err = errors.New("iq bind result missing")
+	}
+
+	return
+}
+
+// After the bind, if the session is not optional (as per old RFC 3921), we send the session open iq.
+func (s *Session) rfc3921Session(o Config) {
+	if s.err != nil {
+		return
+	}
+
+	var iq stanza.IQ
+	// We only negotiate session binding if it is mandatory, we skip it when optional.
+	if !s.Features.Session.IsOptional() {
+		fmt.Fprintf(s.streamLogger, "<iq type='set' id='%s'><session xmlns='%s'/></iq>", s.PacketId(), stanza.NSSession)
+		if s.err = s.decoder.Decode(&iq); s.err != nil {
+			s.err = errors.New("expecting iq result after session open: " + s.err.Error())
+			return
+		}
+	}
+}
+
+// Enable stream management, with session resumption, if supported.
+func (s *Session) EnableStreamManagement(o Config) {
+	if s.err != nil {
+		return
+	}
+	if !s.Features.DoesStreamManagement() {
+		return
+	}
+
+	fmt.Fprintf(s.streamLogger, "<enable xmlns='%s' resume='true'/>", stanza.NSStreamManagement)
+
+	var packet stanza.Packet
+	packet, s.err = stanza.NextPacket(s.decoder)
+	if s.err == nil {
+		switch p := packet.(type) {
+		case stanza.SMEnabled:
+			s.SMState = SMState{Id: p.Id}
+		case stanza.SMFailed:
+			// TODO: Store error in SMState, for later inspection
+		default:
+			s.err = errors.New("unexpected reply to SM enable")
+		}
+	}
+
+	return
+}

stanza/README.md

@@ -0,0 +1,142 @@
+# XMPP Stanza
+
+XMPP `stanza` package is used to parse, marshal and unmarshal XMPP stanzas and nonzas.
+
+## Stanza creation
+
+When creating stanzas, you can use two approaches:
+
+1. You can create IQ, Presence or Message structs, set the fields and manually prepare extensions struct to add to the
+stanza.
+2. You can use `stanza` build helper to be guided when creating the stanza, and have more controls performed on the
+final stanza.
+
+The methods are equivalent and you can use whatever suits you best. The helpers will finally generate the same type of
+struct that you can build by hand.
+
+### Composing stanzas manually with structs
+
+Here is for example how you would generate an IQ discovery result:
+
+	iqResp := stanza.NewIQ(stanza.Attrs{Type: "result", From: iq.To, To: iq.From, Id: iq.Id})
+	identity := stanza.Identity{
+		Name:     opts.Name,
+		Category: opts.Category,
+		Type:     opts.Type,
+	}
+	payload := stanza.DiscoInfo{
+		XMLName: xml.Name{
+			Space: stanza.NSDiscoInfo,
+			Local: "query",
+		},
+		Identity: []stanza.Identity{identity},
+		Features: []stanza.Feature{
+			{Var: stanza.NSDiscoInfo},
+			{Var: stanza.NSDiscoItems},
+			{Var: "jabber:iq:version"},
+			{Var: "urn:xmpp:delegation:1"},
+		},
+	}
+	iqResp.Payload = &payload
+
+### Using helpers
+
+Here is for example how you would generate an IQ discovery result using Builder:
+
+	iq := stanza.NewIQ(stanza.Attrs{Type: "get", To: "service.localhost", Id: "disco-get-1"})
+	disco := iq.DiscoInfo()
+	disco.AddIdentity("Test Component", "gateway", "service")
+	disco.AddFeatures(stanza.NSDiscoInfo, stanza.NSDiscoItems, "jabber:iq:version", "urn:xmpp:delegation:1")
+
+## Payload and extensions
+
+### Message
+
+Here is the list of implemented message extensions:
+
+- `Delegation`
+
+- `Markable`
+- `MarkAcknowledged`
+- `MarkDisplayed`
+- `MarkReceived`
+
+- `StateActive`
+- `StateComposing`
+- `StateGone`
+- `StateInactive`
+- `StatePaused`
+
+- `HTML`
+
+- `OOB`
+
+- `ReceiptReceived`
+- `ReceiptRequest`
+
+- `Mood`
+
+### Presence
+
+Here is the list of implemented presence extensions:
+
+- `MucPresence`
+
+### IQ
+
+IQ (Information Queries) contain a payload associated with the request and possibly an error. The main difference with
+Message and Presence extension is that you can only have one payload per IQ. The XMPP specification does not support
+having multiple payloads.
+
+Here is the list of structs implementing IQPayloads:
+
+- `ControlSet`
+- `ControlSetResponse`
+- `Delegation`
+- `DiscoInfo`
+- `DiscoItems`
+- `Pubsub`
+- `Version`
+- `Node`
+
+Finally, when the payload of the parsed stanza is unknown, the parser will provide the unknown payload as a generic
+`Node` element. You can also use the Node struct to add custom information on stanza generation. However, in both cases,
+you may also consider [adding your own custom extensions on stanzas]().
+
+
+## Adding your own custom extensions on stanzas
+
+Extensions are registered on launch using the `Registry`. It can be used to register you own custom payload. You may
+want to do so to support extensions we did not yet implement, or to add your own custom extensions to your XMPP stanzas.
+
+To create an extension you need:
+1. to create a struct for that extension. It need to have XMLName for consistency and to tagged at the struct level with
+`xml` info.
+2. It need to implement one or several extensions interface: stanza.IQPayload, stanza.MsgExtension and / or
+stanza.PresExtension
+3. Add that custom extension to the stanza.TypeRegistry during the file init.
+
+Here an example code showing how to create a custom IQPayload. 
+
+```go
+package myclient
+
+import (
+	"encoding/xml"
+
+	"gosrc.io/xmpp/stanza"
+)
+
+type CustomPayload struct {
+	XMLName xml.Name `xml:"my:custom:payload query"`
+	Node    string   `xml:"node,attr,omitempty"`
+}
+
+func (c CustomPayload) Namespace() string {
+	return c.XMLName.Space
+}
+
+func init() {
+	stanza.TypeRegistry.MapExtension(stanza.PKTIQ, xml.Name{"my:custom:payload", "query"}, CustomPayload{})
+}
+```

stanza/component.go

@@ -0,0 +1,91 @@
+package stanza
+
+import (
+	"encoding/xml"
+)
+
+// ============================================================================
+// Handshake Stanza
+
+// Handshake is a stanza used by XMPP components to authenticate on XMPP
+// component port.
+type Handshake struct {
+	XMLName xml.Name `xml:"jabber:component:accept handshake"`
+	// TODO Add handshake value with test for proper serialization
+	// Value string     `xml:",innerxml"`
+}
+
+func (Handshake) Name() string {
+	return "component:handshake"
+}
+
+// Handshake decoding wrapper
+
+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
+}
+
+// ============================================================================
+// Component delegation
+// XEP-0355
+
+// Delegation can be used both on message (for delegated) and IQ (for Forwarded),
+// 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
+}
+
+func (d *Delegation) Namespace() string {
+	return d.XMLName.Space
+}
+
+// Forwarded is used to wrapped forwarded stanzas.
+// TODO: Move it in another file, as it is not limited to components.
+type Forwarded struct {
+	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 {
+	XMLName   xml.Name `xml:"delegated"`
+	Namespace string   `xml:"namespace,attr,omitempty"`
+}
+
+func init() {
+	TypeRegistry.MapExtension(PKTMessage, xml.Name{"urn:xmpp:delegation:1", "delegation"}, Delegation{})
+	TypeRegistry.MapExtension(PKTIQ, xml.Name{"urn:xmpp:delegation:1", "delegation"}, Delegation{})
+}

stanza/component_test.go

@@ -0,0 +1,79 @@
+package stanza
+
+import (
+	"encoding/xml"
+	"testing"
+)
+
+// We should be able to properly parse delegation confirmation messages
+func TestParsingDelegationMessage(t *testing.T) {
+	packetStr := `<message to='service.localhost' from='localhost'>
+ <delegation xmlns='urn:xmpp:delegation:1'>
+  <delegated namespace='http://jabber.org/protocol/pubsub'/>
+ </delegation>
+</message>`
+	var msg Message
+	data := []byte(packetStr)
+	if err := xml.Unmarshal(data, &msg); err != nil {
+		t.Errorf("Unmarshal(%s) returned error", data)
+	}
+
+	// Check that we have extracted the delegation info as MsgExtension
+	var nsDelegated string
+	for _, ext := range msg.Extensions {
+		if delegation, ok := ext.(*Delegation); ok {
+			nsDelegated = delegation.Delegated.Namespace
+		}
+	}
+	if nsDelegated != "http://jabber.org/protocol/pubsub" {
+		t.Errorf("Could not find delegated namespace in delegation: %#v\n", msg)
+	}
+}
+
+// Check that we can parse a delegation IQ.
+// The most important thing is to be able to
+func TestParsingDelegationIQ(t *testing.T) {
+	packetStr := `<iq to='service.localhost' from='localhost' type='set' id='1'>
+ <delegation xmlns='urn:xmpp:delegation:1'>
+  <forwarded xmlns='urn:xmpp:forward:0'>
+   <iq xml:lang='en' to='test1@localhost' from='test1@localhost/mremond-mbp' type='set' id='aaf3a' xmlns='jabber:client'>
+    <pubsub xmlns='http://jabber.org/protocol/pubsub'>
+     <publish node='http://jabber.org/protocol/mood'>
+      <item id='current'>
+       <mood xmlns='http://jabber.org/protocol/mood'>
+        <excited/>
+       </mood>
+      </item>
+     </publish>
+    </pubsub>
+   </iq>
+  </forwarded>
+ </delegation>
+</iq>`
+	var iq IQ
+	data := []byte(packetStr)
+	if err := xml.Unmarshal(data, &iq); err != nil {
+		t.Errorf("Unmarshal(%s) returned error", data)
+	}
+
+	// Check that we have extracted the delegation info as IQPayload
+	var node string
+	if iq.Payload != nil {
+		if delegation, ok := iq.Payload.(*Delegation); ok {
+			packet := delegation.Forwarded.Stanza
+			forwardedIQ, ok := packet.(IQ)
+			if !ok {
+				t.Errorf("Could not extract packet IQ")
+				return
+			}
+			if forwardedIQ.Payload != nil {
+				if pubsub, ok := forwardedIQ.Payload.(*PubSub); ok {
+					node = pubsub.Publish.Node
+				}
+			}
+		}
+	}
+	if node != "http://jabber.org/protocol/mood" {
+		t.Errorf("Could not find mood node name on delegated publish: %#v\n", iq)
+	}
+}

stanza/doc.go

@@ -0,0 +1,4 @@
+/*
+XMPP stanza package is used to parse, marshal and unmarshal XMPP stanzas and nonzas.
+*/
+package stanza

stanza/error.go

@@ -0,0 +1,110 @@
+package stanza
+
+import (
+	"encoding/xml"
+	"strconv"
+)
+
+// ============================================================================
+// XMPP Errors
+
+// Err is an XMPP stanza payload that is used to report error on message,
+// presence or iq stanza.
+// It is intended to be added in the payload of the erroneous stanza.
+type Err struct {
+	XMLName xml.Name  `xml:"error"`
+	Code    int       `xml:"code,attr,omitempty"`
+	Type    ErrorType `xml:"type,attr"` // required
+	Reason  string
+	Text    string `xml:"urn:ietf:params:xml:ns:xmpp-stanzas text,omitempty"`
+}
+
+// UnmarshalXML implements custom parsing for XMPP errors
+func (x *Err) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
+	x.XMLName = start.Name
+
+	// Extract attributes
+	for _, attr := range start.Attr {
+		if attr.Name.Local == "type" {
+			x.Type = ErrorType(attr.Value)
+		}
+		if attr.Name.Local == "code" {
+			if code, err := strconv.Atoi(attr.Value); err == nil {
+				x.Code = code
+			}
+		}
+	}
+
+	// Check subelements to extract error text and reason (from local namespace).
+	for {
+		t, err := d.Token()
+		if err != nil {
+			return err
+		}
+
+		switch tt := t.(type) {
+
+		case xml.StartElement:
+			elt := new(Node)
+
+			err = d.DecodeElement(elt, &tt)
+			if err != nil {
+				return err
+			}
+
+			textName := xml.Name{Space: "urn:ietf:params:xml:ns:xmpp-stanzas", Local: "text"}
+			if elt.XMLName == textName {
+				x.Text = string(elt.Content)
+			} else if elt.XMLName.Space == "urn:ietf:params:xml:ns:xmpp-stanzas" {
+				x.Reason = elt.XMLName.Local
+			}
+
+		case xml.EndElement:
+			if tt == start.End() {
+				return nil
+			}
+		}
+	}
+}
+
+func (x Err) MarshalXML(e *xml.Encoder, start xml.StartElement) (err error) {
+	if x.Code == 0 {
+		return nil
+	}
+
+	// Encode start element and attributes
+	start.Name = xml.Name{Local: "error"}
+
+	code := xml.Attr{
+		Name:  xml.Name{Local: "code"},
+		Value: strconv.Itoa(x.Code),
+	}
+	start.Attr = append(start.Attr, code)
+
+	if len(x.Type) > 0 {
+		typ := xml.Attr{
+			Name:  xml.Name{Local: "type"},
+			Value: string(x.Type),
+		}
+		start.Attr = append(start.Attr, typ)
+	}
+	err = e.EncodeToken(start)
+
+	// SubTags
+	// Reason
+	if x.Reason != "" {
+		reason := xml.Name{Space: "urn:ietf:params:xml:ns:xmpp-stanzas", Local: x.Reason}
+		e.EncodeToken(xml.StartElement{Name: reason})
+		e.EncodeToken(xml.EndElement{Name: reason})
+	}
+
+	// Text
+	if x.Text != "" {
+		text := xml.Name{Space: "urn:ietf:params:xml:ns:xmpp-stanzas", Local: "text"}
+		e.EncodeToken(xml.StartElement{Name: text})
+		e.EncodeToken(xml.CharData(x.Text))
+		e.EncodeToken(xml.EndElement{Name: text})
+	}
+
+	return e.EncodeToken(xml.EndElement{Name: start.Name})
+}

stanza/error_enum.go

@@ -0,0 +1,13 @@
+package stanza
+
+// ErrorType is a Enum of error attribute type
+type ErrorType string
+
+// RFC 6120: part of A.5 Client Namespace and A.6 Server Namespace
+const (
+	ErrorTypeAuth     ErrorType = "auth"
+	ErrorTypeCancel   ErrorType = "cancel"
+	ErrorTypeContinue ErrorType = "continue"
+	ErrorTypeModify   ErrorType = "modify"
+	ErrorTypeWait     ErrorType = "wait"
+)

stanza/iot.go

@@ -0,0 +1,39 @@
+package stanza
+
+import (
+	"encoding/xml"
+)
+
+type ControlSet struct {
+	XMLName xml.Name       `xml:"urn:xmpp:iot:control set"`
+	Fields  []ControlField `xml:",any"`
+}
+
+func (c *ControlSet) Namespace() string {
+	return c.XMLName.Space
+}
+
+type ControlGetForm struct {
+	XMLName xml.Name `xml:"urn:xmpp:iot:control getForm"`
+}
+
+type ControlField struct {
+	XMLName xml.Name
+	Name    string `xml:"name,attr,omitempty"`
+	Value   string `xml:"value,attr,omitempty"`
+}
+
+type ControlSetResponse struct {
+	XMLName xml.Name `xml:"urn:xmpp:iot:control setResponse"`
+}
+
+func (c *ControlSetResponse) Namespace() string {
+	return c.XMLName.Space
+}
+
+// ============================================================================
+// Registry init
+
+func init() {
+	TypeRegistry.MapExtension(PKTIQ, xml.Name{"urn:xmpp:iot:control", "set"}, ControlSet{})
+}

stanza/iot_test.go

@@ -0,0 +1,26 @@
+package stanza
+
+import (
+	"encoding/xml"
+	"testing"
+)
+
+func TestControlSet(t *testing.T) {
+	packet := `
+<iq to='test@localhost/jukebox' from='admin@localhost/mbp' type='set' id='2'>
+ <set xmlns='urn:xmpp:iot:control' xml:lang='en'>
+	<string name='action' value='play'/>
+	<string name='url' value='https://soundcloud.com/radiohead/spectre'/>
+ </set>
+</iq>`
+
+	parsedIQ := IQ{}
+	data := []byte(packet)
+	if err := xml.Unmarshal(data, &parsedIQ); err != nil {
+		t.Errorf("Unmarshal(%s) returned error", data)
+	}
+
+	if cs, ok := parsedIQ.Payload.(*ControlSet); !ok {
+		t.Errorf("Paylod is not an iot control set: %v", cs)
+	}
+}

stanza/iq.go

@@ -0,0 +1,128 @@
+package stanza
+
+import (
+	"encoding/xml"
+)
+
+/*
+TODO support ability to put Raw payload inside IQ
+*/
+
+// ============================================================================
+// IQ Packet
+
+// IQ implements RFC 6120 - A.5 Client Namespace (a part)
+type IQ struct { // Info/Query
+	XMLName xml.Name `xml:"iq"`
+	// MUST have a ID
+	Attrs
+	// We can only have one payload on IQ:
+	//   "An IQ stanza of type "get" or "set" MUST contain exactly one
+	//    child element, which specifies the semantics of the particular
+	//    request."
+	Payload IQPayload `xml:",omitempty"`
+	Error   Err       `xml:"error,omitempty"`
+	// Any is used to decode unknown payload as a generique structure
+	Any *Node `xml:",any"`
+}
+
+type IQPayload interface {
+	Namespace() string
+}
+
+func NewIQ(a Attrs) IQ {
+	// TODO generate IQ ID if not set
+	// TODO ensure that type is set, as it is required
+	return IQ{
+		XMLName: xml.Name{Local: "iq"},
+		Attrs:   a,
+	}
+}
+
+func (iq IQ) MakeError(xerror Err) IQ {
+	from := iq.From
+	to := iq.To
+
+	iq.Type = "error"
+	iq.From = to
+	iq.To = from
+	iq.Error = xerror
+
+	return iq
+}
+
+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
+}
+
+// UnmarshalXML implements custom parsing for IQs
+func (iq *IQ) 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 == "type" {
+			iq.Type = StanzaType(attr.Value)
+		}
+		if attr.Name.Local == "to" {
+			iq.To = attr.Value
+		}
+		if attr.Name.Local == "from" {
+			iq.From = attr.Value
+		}
+	}
+
+	// decode inner elements
+	for {
+		t, err := d.Token()
+		if err != nil {
+			return err
+		}
+
+		switch tt := t.(type) {
+		case xml.StartElement:
+			if tt.Name.Local == "error" {
+				var xmppError Err
+				err = d.DecodeElement(&xmppError, &tt)
+				if err != nil {
+					return err
+				}
+				iq.Error = xmppError
+				continue
+			}
+			if iqExt := TypeRegistry.GetIQExtension(tt.Name); iqExt != nil {
+				// Decode payload extension
+				err = d.DecodeElement(iqExt, &tt)
+				if err != nil {
+					return err
+				}
+				iq.Payload = iqExt
+				continue
+			}
+			// TODO: If unknown decode as generic node
+			node := new(Node)
+			err = d.DecodeElement(node, &tt)
+			if err != nil {
+				return err
+			}
+			iq.Any = node
+		case xml.EndElement:
+			if tt == start.End() {
+				return nil
+			}
+		}
+	}
+}

stanza/iq_disco.go

@@ -0,0 +1,149 @@
+package stanza
+
+import (
+	"encoding/xml"
+)
+
+// ============================================================================
+// Disco Info
+
+const (
+	NSDiscoInfo = "http://jabber.org/protocol/disco#info"
+)
+
+// ----------
+// Namespaces
+
+type DiscoInfo struct {
+	XMLName  xml.Name   `xml:"http://jabber.org/protocol/disco#info query"`
+	Node     string     `xml:"node,attr,omitempty"`
+	Identity []Identity `xml:"identity"`
+	Features []Feature  `xml:"feature"`
+}
+
+func (d *DiscoInfo) Namespace() string {
+	return d.XMLName.Space
+}
+
+// ---------------
+// Builder helpers
+
+// DiscoInfo builds a default DiscoInfo payload
+func (iq *IQ) DiscoInfo() *DiscoInfo {
+	d := DiscoInfo{
+		XMLName: xml.Name{
+			Space: NSDiscoInfo,
+			Local: "query",
+		},
+	}
+	iq.Payload = &d
+	return &d
+}
+
+func (d *DiscoInfo) AddIdentity(name, category, typ string) {
+	identity := Identity{
+		XMLName:  xml.Name{Local: "identity"},
+		Name:     name,
+		Category: category,
+		Type:     typ,
+	}
+	d.Identity = append(d.Identity, identity)
+}
+
+func (d *DiscoInfo) AddFeatures(namespace ...string) {
+	for _, ns := range namespace {
+		d.Features = append(d.Features, Feature{Var: ns})
+	}
+}
+
+func (d *DiscoInfo) SetNode(node string) *DiscoInfo {
+	d.Node = node
+	return d
+}
+
+func (d *DiscoInfo) SetIdentities(ident ...Identity) *DiscoInfo {
+	d.Identity = ident
+	return d
+}
+
+func (d *DiscoInfo) SetFeatures(namespace ...string) *DiscoInfo {
+	d.Features = []Feature{}
+	for _, ns := range namespace {
+		d.Features = append(d.Features, Feature{Var: ns})
+	}
+	return d
+}
+
+// -----------
+// SubElements
+
+type Identity struct {
+	XMLName  xml.Name `xml:"identity,omitempty"`
+	Name     string   `xml:"name,attr,omitempty"`
+	Category string   `xml:"category,attr,omitempty"`
+	Type     string   `xml:"type,attr,omitempty"`
+}
+
+type Feature struct {
+	XMLName xml.Name `xml:"feature"`
+	Var     string   `xml:"var,attr"`
+}
+
+// ============================================================================
+// Disco Info
+
+const (
+	NSDiscoItems = "http://jabber.org/protocol/disco#items"
+)
+
+type DiscoItems struct {
+	XMLName xml.Name    `xml:"http://jabber.org/protocol/disco#items query"`
+	Node    string      `xml:"node,attr,omitempty"`
+	Items   []DiscoItem `xml:"item"`
+}
+
+func (d *DiscoItems) Namespace() string {
+	return d.XMLName.Space
+}
+
+// ---------------
+// Builder helpers
+
+// DiscoItems builds a default DiscoItems payload
+func (iq *IQ) DiscoItems() *DiscoItems {
+	d := DiscoItems{
+		XMLName: xml.Name{Space: "http://jabber.org/protocol/disco#items", Local: "query"},
+	}
+	iq.Payload = &d
+	return &d
+}
+
+func (d *DiscoItems) SetNode(node string) *DiscoItems {
+	d.Node = node
+	return d
+}
+
+func (d *DiscoItems) AddItem(jid, node, name string) *DiscoItems {
+	item := DiscoItem{
+		JID:  jid,
+		Node: node,
+		Name: name,
+	}
+	d.Items = append(d.Items, item)
+	return d
+}
+
+type DiscoItem struct {
+	XMLName xml.Name `xml:"item"`
+	JID     string   `xml:"jid,attr,omitempty"`
+	Node    string   `xml:"node,attr,omitempty"`
+	Name    string   `xml:"name,attr,omitempty"`
+}
+
+// ============================================================================
+// Registry init
+
+func init() {
+	TypeRegistry.MapExtension(PKTIQ, xml.Name{NSDiscoInfo, "query"}, DiscoInfo{})
+	TypeRegistry.MapExtension(PKTIQ, xml.Name{NSDiscoItems, "query"}, DiscoItems{})
+}

stanza/iq_disco_test.go

@@ -0,0 +1,90 @@
+package stanza_test
+
+import (
+	"encoding/xml"
+	"testing"
+
+	"gosrc.io/xmpp/stanza"
+)
+
+// Test DiscoInfo Builder with several features
+func TestDiscoInfo_Builder(t *testing.T) {
+	iq := stanza.NewIQ(stanza.Attrs{Type: "get", To: "service.localhost", Id: "disco-get-1"})
+	disco := iq.DiscoInfo()
+	disco.AddIdentity("Test Component", "gateway", "service")
+	disco.AddFeatures(stanza.NSDiscoInfo, stanza.NSDiscoItems, "jabber:iq:version", "urn:xmpp:delegation:1")
+
+	parsedIQ, err := checkMarshalling(t, iq)
+	if err != nil {
+		return
+	}
+
+	// Check result
+	pp, ok := parsedIQ.Payload.(*stanza.DiscoInfo)
+	if !ok {
+		t.Errorf("Parsed stanza does not contain correct IQ payload")
+	}
+
+	// Check features
+	features := []string{stanza.NSDiscoInfo, stanza.NSDiscoItems, "jabber:iq:version", "urn:xmpp:delegation:1"}
+	if len(pp.Features) != len(features) {
+		t.Errorf("Features length mismatch: %#v", pp.Features)
+	} else {
+		for i, f := range pp.Features {
+			if f.Var != features[i] {
+				t.Errorf("Missing feature: %s", features[i])
+			}
+		}
+	}
+
+	// Check identity
+	if len(pp.Identity) != 1 {
+		t.Errorf("Identity length mismatch: %#v", pp.Identity)
+	} else {
+		if pp.Identity[0].Name != "Test Component" {
+			t.Errorf("Incorrect identity name: %#v", pp.Identity[0].Name)
+		}
+	}
+}
+
+// Implements XEP-0030 example 17
+// https://xmpp.org/extensions/xep-0030.html#example-17
+func TestDiscoItems_Builder(t *testing.T) {
+	iq := stanza.NewIQ(stanza.Attrs{Type: "result", From: "catalog.shakespeare.lit",
+		To: "romeo@montague.net/orchard", Id: "items-2"})
+	iq.DiscoItems().
+		AddItem("catalog.shakespeare.lit", "books", "Books by and about Shakespeare").
+		AddItem("catalog.shakespeare.lit", "clothing", "Wear your literary taste with pride").
+		AddItem("catalog.shakespeare.lit", "music", "Music from the time of Shakespeare")
+
+	parsedIQ, err := checkMarshalling(t, iq)
+	if err != nil {
+		return
+	}
+
+	// Check result
+	pp, ok := parsedIQ.Payload.(*stanza.DiscoItems)
+	if !ok {
+		t.Errorf("Parsed stanza does not contain correct IQ payload")
+	}
+
+	// Check items
+	items := []stanza.DiscoItem{{xml.Name{}, "catalog.shakespeare.lit", "books", "Books by and about Shakespeare"},
+		{xml.Name{}, "catalog.shakespeare.lit", "clothing", "Wear your literary taste with pride"},
+		{xml.Name{}, "catalog.shakespeare.lit", "music", "Music from the time of Shakespeare"}}
+	if len(pp.Items) != len(items) {
+		t.Errorf("Items length mismatch: %#v", pp.Items)
+	} else {
+		for i, item := range pp.Items {
+			if item.JID != items[i].JID {
+				t.Errorf("JID Mismatch (expected: %s): %s", items[i].JID, item.JID)
+			}
+			if item.Node != items[i].Node {
+				t.Errorf("Node Mismatch (expected: %s): %s", items[i].JID, item.JID)
+			}
+			if item.Name != items[i].Name {
+				t.Errorf("Name Mismatch (expected: %s): %s", items[i].JID, item.JID)
+			}
+		}
+	}
+}

stanza/iq_test.go

@@ -0,0 +1,171 @@
+package stanza_test
+
+import (
+	"encoding/xml"
+	"strings"
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+	"gosrc.io/xmpp/stanza"
+)
+
+func TestUnmarshalIqs(t *testing.T) {
+	//var cs1 = new(iot.ControlSet)
+	var tests = []struct {
+		iqString string
+		parsedIQ stanza.IQ
+	}{
+		{"<iq id=\"1\" type=\"set\" to=\"test@localhost\"/>",
+			stanza.IQ{XMLName: xml.Name{Local: "iq"}, Attrs: stanza.Attrs{Type: stanza.IQTypeSet, To: "test@localhost", 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 {
+		parsedIQ := stanza.IQ{}
+		err := xml.Unmarshal([]byte(test.iqString), &parsedIQ)
+		if err != nil {
+			t.Errorf("Unmarshal(%s) returned error", test.iqString)
+		}
+
+		if !xmlEqual(parsedIQ, test.parsedIQ) {
+			t.Errorf("non matching items\n%s", cmp.Diff(parsedIQ, test.parsedIQ))
+		}
+
+	}
+}
+
+func TestGenerateIq(t *testing.T) {
+	iq := stanza.NewIQ(stanza.Attrs{Type: stanza.IQTypeResult, From: "admin@localhost", To: "test@localhost", Id: "1"})
+	payload := stanza.DiscoInfo{
+		Identity: []stanza.Identity{
+			{Name: "Test Gateway",
+				Category: "gateway",
+				Type:     "mqtt",
+			}},
+		Features: []stanza.Feature{
+			{Var: stanza.NSDiscoInfo},
+			{Var: stanza.NSDiscoItems},
+		},
+	}
+	iq.Payload = &payload
+
+	data, err := xml.Marshal(iq)
+	if err != nil {
+		t.Errorf("cannot marshal xml structure")
+	}
+
+	if strings.Contains(string(data), "<error ") {
+		t.Error("empty error should not be serialized")
+	}
+
+	parsedIQ := stanza.IQ{}
+	if err = xml.Unmarshal(data, &parsedIQ); err != nil {
+		t.Errorf("Unmarshal(%s) returned error", data)
+	}
+
+	if !xmlEqual(iq.Payload, parsedIQ.Payload) {
+		t.Errorf("non matching items\n%s", xmlDiff(iq.Payload, parsedIQ.Payload))
+	}
+}
+
+func TestErrorTag(t *testing.T) {
+	xError := stanza.Err{
+		XMLName: xml.Name{Local: "error"},
+		Code:    503,
+		Type:    "cancel",
+		Reason:  "service-unavailable",
+		Text:    "User session not found",
+	}
+
+	data, err := xml.Marshal(xError)
+	if err != nil {
+		t.Errorf("cannot marshal xml structure: %s", err)
+	}
+
+	parsedError := stanza.Err{}
+	if err = xml.Unmarshal(data, &parsedError); err != nil {
+		t.Errorf("Unmarshal(%s) returned error", data)
+	}
+
+	if !xmlEqual(parsedError, xError) {
+		t.Errorf("non matching items\n%s", cmp.Diff(parsedError, xError))
+	}
+}
+
+func TestDiscoItems(t *testing.T) {
+	iq := stanza.NewIQ(stanza.Attrs{Type: stanza.IQTypeGet, From: "romeo@montague.net/orchard", To: "catalog.shakespeare.lit", Id: "items3"})
+	payload := stanza.DiscoItems{
+		Node: "music",
+	}
+	iq.Payload = &payload
+
+	data, err := xml.Marshal(iq)
+	if err != nil {
+		t.Errorf("cannot marshal xml structure")
+	}
+
+	parsedIQ := stanza.IQ{}
+	if err = xml.Unmarshal(data, &parsedIQ); err != nil {
+		t.Errorf("Unmarshal(%s) returned error", data)
+	}
+
+	if !xmlEqual(parsedIQ.Payload, iq.Payload) {
+		t.Errorf("non matching items\n%s", cmp.Diff(parsedIQ.Payload, iq.Payload))
+	}
+}
+
+func TestUnmarshalPayload(t *testing.T) {
+	query := "<iq to='service.localhost' type='get' id='1'><query xmlns='jabber:iq:version'/></iq>"
+
+	parsedIQ := stanza.IQ{}
+	err := xml.Unmarshal([]byte(query), &parsedIQ)
+	if err != nil {
+		t.Errorf("Unmarshal(%s) returned error", query)
+	}
+
+	if parsedIQ.Payload == nil {
+		t.Error("Missing payload")
+	}
+
+	namespace := parsedIQ.Payload.Namespace()
+	if namespace != "jabber:iq:version" {
+		t.Errorf("incorrect namespace: %s", namespace)
+	}
+}
+
+func TestPayloadWithError(t *testing.T) {
+	iq := `<iq xml:lang='en' to='test1@localhost/resource' from='test@localhost' type='error' id='aac1a'>
+ <query xmlns='jabber:iq:version'/>
+ <error code='407' type='auth'>
+  <subscription-required xmlns='urn:ietf:params:xml:ns:xmpp-stanzas'/>
+  <text xml:lang='en' xmlns='urn:ietf:params:xml:ns:xmpp-stanzas'>Not subscribed</text>
+ </error>
+</iq>`
+
+	parsedIQ := stanza.IQ{}
+	err := xml.Unmarshal([]byte(iq), &parsedIQ)
+	if err != nil {
+		t.Errorf("Unmarshal error: %s", iq)
+		return
+	}
+
+	if parsedIQ.Error.Reason != "subscription-required" {
+		t.Errorf("incorrect error value: '%s'", parsedIQ.Error.Reason)
+	}
+}
+
+func TestUnknownPayload(t *testing.T) {
+	iq := `<iq type="get" to="service.localhost" id="1" >
+ <query xmlns="unknown:ns"/>
+</iq>`
+	parsedIQ := stanza.IQ{}
+	err := xml.Unmarshal([]byte(iq), &parsedIQ)
+	if err != nil {
+		t.Errorf("Unmarshal error: %#v (%s)", err, iq)
+		return
+	}
+
+	if parsedIQ.Any.XMLName.Space != "unknown:ns" {
+		t.Errorf("could not extract namespace: '%s'", parsedIQ.Any.XMLName.Space)
+	}
+}

stanza/iq_version.go

@@ -0,0 +1,45 @@
+package stanza
+
+import "encoding/xml"
+
+// ============================================================================
+// Software Version (XEP-0092)
+
+// Version
+type Version struct {
+	XMLName xml.Name `xml:"jabber:iq:version query"`
+	Name    string   `xml:"name,omitempty"`
+	Version string   `xml:"version,omitempty"`
+	OS      string   `xml:"os,omitempty"`
+}
+
+func (v *Version) Namespace() string {
+	return v.XMLName.Space
+}
+
+// ---------------
+// Builder helpers
+
+// Version builds a default software version payload
+func (iq *IQ) Version() *Version {
+	d := Version{
+		XMLName: xml.Name{Space: "jabber:iq:version", Local: "query"},
+	}
+	iq.Payload = &d
+	return &d
+}
+
+// Set all software version info
+func (v *Version) SetInfo(name, version, os string) *Version {
+	v.Name = name
+	v.Version = version
+	v.OS = os
+	return v
+}
+
+// ============================================================================
+// Registry init
+
+func init() {
+	TypeRegistry.MapExtension(PKTIQ, xml.Name{"jabber:iq:version", "query"}, Version{})
+}

stanza/iq_version_test.go

@@ -0,0 +1,40 @@
+package stanza_test
+
+import (
+	"testing"
+
+	"gosrc.io/xmpp/stanza"
+)
+
+// Build a Software Version reply
+// https://xmpp.org/extensions/xep-0092.html#example-2
+func TestVersion_Builder(t *testing.T) {
+	name := "Exodus"
+	version := "0.7.0.4"
+	os := "Windows-XP 5.01.2600"
+	iq := stanza.NewIQ(stanza.Attrs{Type: "result", From: "romeo@montague.net/orchard",
+		To: "juliet@capulet.com/balcony", Id: "version_1"})
+	iq.Version().SetInfo(name, version, os)
+
+	parsedIQ, err := checkMarshalling(t, iq)
+	if err != nil {
+		return
+	}
+
+	// Check result
+	pp, ok := parsedIQ.Payload.(*stanza.Version)
+	if !ok {
+		t.Errorf("Parsed stanza does not contain correct IQ payload")
+	}
+
+	// Check version info
+	if pp.Name != name {
+		t.Errorf("Name Mismatch (expected: %s): %s", name, pp.Name)
+	}
+	if pp.Version != version {
+		t.Errorf("Version Mismatch (expected: %s): %s", version, pp.Version)
+	}
+	if pp.OS != os {
+		t.Errorf("OS Mismatch (expected: %s): %s", os, pp.OS)
+	}
+}

stanza/message.go

@@ -0,0 +1,148 @@
+package stanza
+
+import (
+	"encoding/xml"
+	"reflect"
+)
+
+// ============================================================================
+// Message Packet
+
+// Message implements RFC 6120 - A.5 Client Namespace (a part)
+type Message struct {
+	XMLName xml.Name `xml:"message"`
+	Attrs
+
+	Subject    string         `xml:"subject,omitempty"`
+	Body       string         `xml:"body,omitempty"`
+	Thread     string         `xml:"thread,omitempty"`
+	Error      Err            `xml:"error,omitempty"`
+	Extensions []MsgExtension `xml:",omitempty"`
+}
+
+func (Message) Name() string {
+	return "message"
+}
+
+func NewMessage(a Attrs) Message {
+	return Message{
+		XMLName: xml.Name{Local: "message"},
+		Attrs:   a,
+	}
+}
+
+// Get search and extracts a specific extension on a message.
+// It receives a pointer to an MsgExtension. It will panic if the caller
+// does not pass a pointer.
+// It will return true if the passed extension is found and set the pointer
+// to the extension passed as parameter to the found extension.
+// It will return false if the extension is not found on the message.
+//
+// Example usage:
+//   var oob xmpp.OOB
+//   if ok := msg.Get(&oob); ok {
+//     // oob extension has been found
+//	 }
+func (msg *Message) Get(ext MsgExtension) bool {
+	target := reflect.ValueOf(ext)
+	if target.Kind() != reflect.Ptr {
+		panic("you must pass a pointer to the message Get method")
+	}
+
+	for _, e := range msg.Extensions {
+		if reflect.TypeOf(e) == target.Type() {
+			source := reflect.ValueOf(e)
+			if source.Kind() != reflect.Ptr {
+				source = source.Elem()
+			}
+			target.Elem().Set(source.Elem())
+			return true
+		}
+	}
+	return false
+}
+
+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
+}
+
+// XMPPFormat with all Extensions
+func (msg *Message) XMPPFormat() string {
+	out, err := xml.MarshalIndent(msg, "", "")
+	if err != nil {
+		return ""
+	}
+	return string(out)
+}
+
+// UnmarshalXML implements custom parsing for messages
+func (msg *Message) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
+	msg.XMLName = start.Name
+
+	// Extract packet attributes
+	for _, attr := range start.Attr {
+		if attr.Name.Local == "id" {
+			msg.Id = attr.Value
+		}
+		if attr.Name.Local == "type" {
+			msg.Type = StanzaType(attr.Value)
+		}
+		if attr.Name.Local == "to" {
+			msg.To = attr.Value
+		}
+		if attr.Name.Local == "from" {
+			msg.From = attr.Value
+		}
+		if attr.Name.Local == "lang" {
+			msg.Lang = attr.Value
+		}
+	}
+
+	// decode inner elements
+	for {
+		t, err := d.Token()
+		if err != nil {
+			return err
+		}
+
+		switch tt := t.(type) {
+
+		case xml.StartElement:
+			if msgExt := TypeRegistry.GetMsgExtension(tt.Name); msgExt != nil {
+				// Decode message extension
+				err = d.DecodeElement(msgExt, &tt)
+				if err != nil {
+					return err
+				}
+				msg.Extensions = append(msg.Extensions, msgExt)
+			} else {
+				// Decode standard message sub-elements
+				var err error
+				switch tt.Name.Local {
+				case "body":
+					err = d.DecodeElement(&msg.Body, &tt)
+				case "thread":
+					err = d.DecodeElement(&msg.Thread, &tt)
+				case "subject":
+					err = d.DecodeElement(&msg.Subject, &tt)
+				case "error":
+					err = d.DecodeElement(&msg.Error, &tt)
+				}
+				if err != nil {
+					return err
+				}
+			}
+
+		case xml.EndElement:
+			if tt == start.End() {
+				return nil
+			}
+		}
+	}
+}

stanza/message_test.go

@@ -0,0 +1,76 @@
+package stanza_test
+
+import (
+	"encoding/xml"
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+	"gosrc.io/xmpp/stanza"
+)
+
+func TestGenerateMessage(t *testing.T) {
+	message := stanza.NewMessage(stanza.Attrs{Type: stanza.MessageTypeChat, From: "admin@localhost", To: "test@localhost", Id: "1"})
+	message.Body = "Hi"
+	message.Subject = "Msg Subject"
+
+	data, err := xml.Marshal(message)
+	if err != nil {
+		t.Errorf("cannot marshal xml structure")
+	}
+
+	parsedMessage := stanza.Message{}
+	if err = xml.Unmarshal(data, &parsedMessage); err != nil {
+		t.Errorf("Unmarshal(%s) returned error", data)
+	}
+
+	if !xmlEqual(parsedMessage, message) {
+		t.Errorf("non matching items\n%s", cmp.Diff(parsedMessage, message))
+	}
+}
+
+func TestDecodeError(t *testing.T) {
+	str := `<message from='juliet@capulet.com'
+         id='msg_1'
+         to='romeo@montague.lit'
+         type='error'>
+  <error type='cancel'>
+    <not-acceptable xmlns='urn:ietf:params:xml:ns:xmpp-stanzas'/>
+  </error>
+</message>`
+
+	parsedMessage := stanza.Message{}
+	if err := xml.Unmarshal([]byte(str), &parsedMessage); err != nil {
+		t.Errorf("message error stanza unmarshall error: %v", err)
+		return
+	}
+	if parsedMessage.Error.Type != "cancel" {
+		t.Errorf("incorrect error type: %s", parsedMessage.Error.Type)
+	}
+}
+
+func TestGetOOB(t *testing.T) {
+	image := "https://localhost/image.png"
+	msg := stanza.NewMessage(stanza.Attrs{To: "test@localhost"})
+	ext := stanza.OOB{
+		XMLName: xml.Name{Space: "jabber:x:oob", Local: "x"},
+		URL:     image,
+	}
+	msg.Extensions = append(msg.Extensions, &ext)
+
+	// OOB can properly be found
+	var oob stanza.OOB
+	// Try to find and
+	if ok := msg.Get(&oob); !ok {
+		t.Error("could not find oob extension")
+		return
+	}
+	if oob.URL != image {
+		t.Errorf("OOB URL was not properly extracted: ''%s", oob.URL)
+	}
+
+	// Markable is not found
+	var m stanza.Markable
+	if ok := msg.Get(&m); ok {
+		t.Error("we should not have found markable extension")
+	}
+}

stanza/msg_chat_markers.go

@@ -0,0 +1,42 @@
+package stanza
+
+import (
+	"encoding/xml"
+)
+
+/*
+Support for:
+- XEP-0333 - Chat Markers: https://xmpp.org/extensions/xep-0333.html
+*/
+
+const NSMsgChatMarkers = "urn:xmpp:chat-markers:0"
+
+type Markable struct {
+	MsgExtension
+	XMLName xml.Name `xml:"urn:xmpp:chat-markers:0 markable"`
+}
+
+type MarkReceived struct {
+	MsgExtension
+	XMLName xml.Name `xml:"urn:xmpp:chat-markers:0 received"`
+	ID      string   `xml:"id,attr"`
+}
+
+type MarkDisplayed struct {
+	MsgExtension
+	XMLName xml.Name `xml:"urn:xmpp:chat-markers:0 displayed"`
+	ID      string   `xml:"id,attr"`
+}
+
+type MarkAcknowledged struct {
+	MsgExtension
+	XMLName xml.Name `xml:"urn:xmpp:chat-markers:0 acknowledged"`
+	ID      string   `xml:"id,attr"`
+}
+
+func init() {
+	TypeRegistry.MapExtension(PKTMessage, xml.Name{NSMsgChatMarkers, "markable"}, Markable{})
+	TypeRegistry.MapExtension(PKTMessage, xml.Name{NSMsgChatMarkers, "received"}, MarkReceived{})
+	TypeRegistry.MapExtension(PKTMessage, xml.Name{NSMsgChatMarkers, "displayed"}, MarkDisplayed{})
+	TypeRegistry.MapExtension(PKTMessage, xml.Name{NSMsgChatMarkers, "acknowledged"}, MarkAcknowledged{})
+}

stanza/msg_chat_state.go

@@ -0,0 +1,45 @@
+package stanza
+
+import (
+	"encoding/xml"
+)
+
+/*
+Support for:
+- XEP-0085 - Chat State Notifications: https://xmpp.org/extensions/xep-0085.html
+*/
+
+const NSMsgChatStateNotifications = "http://jabber.org/protocol/chatstates"
+
+type StateActive struct {
+	MsgExtension
+	XMLName xml.Name `xml:"http://jabber.org/protocol/chatstates active"`
+}
+
+type StateComposing struct {
+	MsgExtension
+	XMLName xml.Name `xml:"http://jabber.org/protocol/chatstates composing"`
+}
+
+type StateGone struct {
+	MsgExtension
+	XMLName xml.Name `xml:"http://jabber.org/protocol/chatstates gone"`
+}
+
+type StateInactive struct {
+	MsgExtension
+	XMLName xml.Name `xml:"http://jabber.org/protocol/chatstates inactive"`
+}
+
+type StatePaused struct {
+	MsgExtension
+	XMLName xml.Name `xml:"http://jabber.org/protocol/chatstates paused"`
+}
+
+func init() {
+	TypeRegistry.MapExtension(PKTMessage, xml.Name{NSMsgChatStateNotifications, "active"}, StateActive{})
+	TypeRegistry.MapExtension(PKTMessage, xml.Name{NSMsgChatStateNotifications, "composing"}, StateComposing{})
+	TypeRegistry.MapExtension(PKTMessage, xml.Name{NSMsgChatStateNotifications, "gone"}, StateGone{})
+	TypeRegistry.MapExtension(PKTMessage, xml.Name{NSMsgChatStateNotifications, "inactive"}, StateInactive{})
+	TypeRegistry.MapExtension(PKTMessage, xml.Name{NSMsgChatStateNotifications, "paused"}, StatePaused{})
+}

stanza/msg_html.go

@@ -0,0 +1,22 @@
+package stanza
+
+import (
+	"encoding/xml"
+)
+
+type HTML struct {
+	MsgExtension
+	XMLName xml.Name `xml:"http://jabber.org/protocol/xhtml-im html"`
+	Body    HTMLBody
+	Lang    string `xml:"xml:lang,attr,omitempty"`
+}
+
+type HTMLBody struct {
+	XMLName xml.Name `xml:"http://www.w3.org/1999/xhtml body"`
+	// InnerXML MUST be valid xhtml. We do not check if it is valid when generating the XMPP stanza.
+	InnerXML string `xml:",innerxml"`
+}
+
+func init() {
+	TypeRegistry.MapExtension(PKTMessage, xml.Name{"http://jabber.org/protocol/xhtml-im", "html"}, HTML{})
+}

stanza/msg_html_test.go

@@ -0,0 +1,44 @@
+package stanza_test
+
+import (
+	"encoding/xml"
+	"testing"
+
+	"gosrc.io/xmpp/stanza"
+)
+
+func TestHTMLGen(t *testing.T) {
+	htmlBody := "<p>Hello <b>World</b></p>"
+	msg := stanza.NewMessage(stanza.Attrs{To: "test@localhost"})
+	msg.Body = "Hello World"
+	body := stanza.HTMLBody{
+		InnerXML: htmlBody,
+	}
+	html := stanza.HTML{Body: body}
+	msg.Extensions = append(msg.Extensions, html)
+
+	result := msg.XMPPFormat()
+	str := `<message to="test@localhost"><body>Hello World</body><html xmlns="http://jabber.org/protocol/xhtml-im"><body xmlns="http://www.w3.org/1999/xhtml"><p>Hello <b>World</b></p></body></html></message>`
+	if result != str {
+		t.Errorf("incorrect serialize message:\n%s", result)
+	}
+
+	parsedMessage := stanza.Message{}
+	if err := xml.Unmarshal([]byte(str), &parsedMessage); err != nil {
+		t.Errorf("message HTML unmarshall error: %v", err)
+		return
+	}
+
+	if parsedMessage.Body != msg.Body {
+		t.Errorf("incorrect parsed body: '%s'", parsedMessage.Body)
+	}
+
+	var h stanza.HTML
+	if ok := parsedMessage.Get(&h); !ok {
+		t.Error("could not extract HTML body")
+	}
+
+	if h.Body.InnerXML != htmlBody {
+		t.Errorf("could not extract html body: '%s'", h.Body.InnerXML)
+	}
+}

stanza/msg_oob.go

@@ -0,0 +1,21 @@
+package stanza
+
+import (
+	"encoding/xml"
+)
+
+/*
+Support for:
+- XEP-0066 - Out of Band Data: https://xmpp.org/extensions/xep-0066.html
+*/
+
+type OOB struct {
+	MsgExtension
+	XMLName xml.Name `xml:"jabber:x:oob x"`
+	URL     string   `xml:"url"`
+	Desc    string   `xml:"desc,omitempty"`
+}
+
+func init() {
+	TypeRegistry.MapExtension(PKTMessage, xml.Name{"jabber:x:oob", "x"}, OOB{})
+}

stanza/msg_receipts.go

@@ -0,0 +1,29 @@
+package stanza
+
+import (
+	"encoding/xml"
+)
+
+/*
+Support for:
+- XEP-0184 - Message Delivery Receipts: https://xmpp.org/extensions/xep-0184.html
+*/
+
+const NSMsgReceipts = "urn:xmpp:receipts"
+
+// Used on outgoing message, to tell the recipient that you are requesting a message receipt / ack.
+type ReceiptRequest struct {
+	MsgExtension
+	XMLName xml.Name `xml:"urn:xmpp:receipts request"`
+}
+
+type ReceiptReceived struct {
+	MsgExtension
+	XMLName xml.Name `xml:"urn:xmpp:receipts received"`
+	ID      string   `xml:"id,attr"`
+}
+
+func init() {
+	TypeRegistry.MapExtension(PKTMessage, xml.Name{NSMsgReceipts, "request"}, ReceiptRequest{})
+	TypeRegistry.MapExtension(PKTMessage, xml.Name{NSMsgReceipts, "received"}, ReceiptReceived{})
+}

stanza/msg_receipts_test.go

@@ -0,0 +1,42 @@
+package stanza_test
+
+import (
+	"encoding/xml"
+	"testing"
+
+	"gosrc.io/xmpp/stanza"
+)
+
+func TestDecodeRequest(t *testing.T) {
+	str := `<message
+    from='northumberland@shakespeare.lit/westminster'
+    id='richard2-4.1.247'
+    to='kingrichard@royalty.england.lit/throne'>
+  <body>My lord, dispatch; read o'er these articles.</body>
+  <request xmlns='urn:xmpp:receipts'/>
+</message>`
+	parsedMessage := stanza.Message{}
+	if err := xml.Unmarshal([]byte(str), &parsedMessage); err != nil {
+		t.Errorf("message receipt unmarshall error: %v", err)
+		return
+	}
+
+	if parsedMessage.Body != "My lord, dispatch; read o'er these articles." {
+		t.Errorf("Unexpected body: '%s'", parsedMessage.Body)
+	}
+
+	if len(parsedMessage.Extensions) < 1 {
+		t.Errorf("no extension found on parsed message")
+		return
+	}
+
+	switch ext := parsedMessage.Extensions[0].(type) {
+	case *stanza.ReceiptRequest:
+		if ext.XMLName.Local != "request" {
+			t.Errorf("unexpected extension: %s:%s", ext.XMLName.Space, ext.XMLName.Local)
+		}
+	default:
+		t.Errorf("could not find receipts extension")
+	}
+
+}

stanza/node.go

@@ -0,0 +1,51 @@
+package stanza
+
+import "encoding/xml"
+
+// ============================================================================
+// Generic / unknown content
+
+// Node is a generic structure to represent XML data. It is used to parse
+// unreferenced or custom stanza payload.
+type Node struct {
+	XMLName xml.Name
+	Attrs   []xml.Attr `xml:"-"`
+	Content string     `xml:",innerxml"`
+	Nodes   []Node     `xml:",any"`
+}
+
+func (n *Node) Namespace() string {
+	return n.XMLName.Space
+}
+
+// Attr represents generic XML attributes, as used on the generic XML Node
+// representation.
+type Attr struct {
+	K string
+	V string
+}
+
+// UnmarshalXML is a custom unmarshal function used by xml.Unmarshal to
+// transform generic XML content into hierarchical Node structure.
+func (n *Node) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
+	// Assign	"n.Attrs = start.Attr", without repeating xmlns in attributes:
+	for _, attr := range start.Attr {
+		// Do not repeat xmlns, it is already in XMLName
+		if attr.Name.Local != "xmlns" {
+			n.Attrs = append(n.Attrs, attr)
+		}
+	}
+	type node Node
+	return d.DecodeElement((*node)(n), &start)
+}
+
+// MarshalXML is a custom XML serializer used by xml.Marshal to serialize a
+// Node structure to XML.
+func (n Node) MarshalXML(e *xml.Encoder, start xml.StartElement) (err error) {
+	start.Attr = n.Attrs
+	start.Name = n.XMLName
+
+	err = e.EncodeToken(start)
+	e.EncodeElement(n.Nodes, xml.StartElement{Name: n.XMLName})
+	return e.EncodeToken(xml.EndElement{Name: start.Name})
+}

stanza/ns.go

@@ -0,0 +1,11 @@
+package stanza
+
+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"
+	NSComponent = "jabber:component:accept"
+)

stanza/packet.go

@@ -0,0 +1,18 @@
+package stanza
+
+type Packet interface {
+	Name() string
+}
+
+// Attrs represents the common structure for base XMPP packets.
+type Attrs struct {
+	Type StanzaType `xml:"type,attr,omitempty"`
+	Id   string     `xml:"id,attr,omitempty"`
+	From string     `xml:"from,attr,omitempty"`
+	To   string     `xml:"to,attr,omitempty"`
+	Lang string     `xml:"lang,attr,omitempty"`
+}
+
+type packetFormatter interface {
+	XMPPFormat() string
+}

stanza/packet_enum.go

@@ -0,0 +1,25 @@
+package stanza
+
+type StanzaType string
+
+// RFC 6120: part of A.5 Client Namespace and A.6 Server Namespace
+const (
+	IQTypeError  StanzaType = "error"
+	IQTypeGet    StanzaType = "get"
+	IQTypeResult StanzaType = "result"
+	IQTypeSet    StanzaType = "set"
+
+	MessageTypeChat      StanzaType = "chat"
+	MessageTypeError     StanzaType = "error"
+	MessageTypeGroupchat StanzaType = "groupchat"
+	MessageTypeHeadline  StanzaType = "headline"
+	MessageTypeNormal    StanzaType = "normal" // Default
+
+	PresenceTypeError        StanzaType = "error"
+	PresenceTypeProbe        StanzaType = "probe"
+	PresenceTypeSubscribe    StanzaType = "subscribe"
+	PresenceTypeSubscribed   StanzaType = "subscribed"
+	PresenceTypeUnavailable  StanzaType = "unavailable"
+	PresenceTypeUnsubscribe  StanzaType = "unsubscribe"
+	PresenceTypeUnsubscribed StanzaType = "unsubscribed"
+)

stanza/parser.go

@@ -0,0 +1,153 @@
+package stanza
+
+import (
+	"encoding/xml"
+	"errors"
+	"fmt"
+	"io"
+)
+
+// Reads and checks the opening XMPP stream element.
+// 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 InitStream(p *xml.Decoder) (sessionID string, err error) {
+	for {
+		var t xml.Token
+		t, err = p.Token()
+		if err != nil {
+			return sessionID, err
+		}
+
+		switch elem := t.(type) {
+		case xml.StartElement:
+			if elem.Name.Space != NSStream || elem.Name.Local != "stream" {
+				err = errors.New("xmpp: expected <stream> but got <" + elem.Name.Local + "> in " + elem.Name.Space)
+				return sessionID, err
+			}
+
+			// Parse XMPP stream attributes
+			for _, attrs := range elem.Attr {
+				switch attrs.Name.Local {
+				case "id":
+					sessionID = attrs.Value
+				}
+			}
+			return sessionID, err
+		}
+	}
+}
+
+// NextPacket scans XML token stream for next complete XMPP stanza.
+// Once the type of stanza has been identified, a structure is created to decode
+// that stanza and returned.
+// TODO Use an interface to return packets interface xmppDecoder
+// TODO make auth and bind use NextPacket instead of directly NextStart
+func NextPacket(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 nil, err
+	}
+
+	// Decode one of the top level XMPP namespace
+	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)
+	case NSStreamManagement:
+		return sm.decode(p, se)
+	default:
+		return nil, errors.New("unknown namespace " +
+			se.Name.Space + " <" + se.Name.Local + "/>")
+	}
+}
+
+// Scan XML token stream to find next StartElement.
+func NextStart(p *xml.Decoder) (xml.StartElement, error) {
+	for {
+		t, err := p.Token()
+		if err == io.EOF {
+			return xml.StartElement{}, errors.New("connection closed")
+		}
+		if err != nil {
+			return xml.StartElement{}, fmt.Errorf("NextStart %s", err)
+		}
+		switch t := t.(type) {
+		case xml.StartElement:
+			return t, nil
+		}
+	}
+}
+
+/*
+TODO: From all the decoder, we can return a pointer to the actual concrete type, instead of directly that
+   type.
+   That way, we have a consistent way to do type assertion, always matching against pointers.
+*/
+
+// decodeStream will fully decode a stream packet
+func decodeStream(p *xml.Decoder, se xml.StartElement) (Packet, error) {
+	switch se.Name.Local {
+	case "error":
+		return streamError.decode(p, se)
+	case "features":
+		return streamFeatures.decode(p, se)
+	default:
+		return nil, errors.New("unexpected XMPP packet " +
+			se.Name.Space + " <" + se.Name.Local + "/>")
+	}
+}
+
+// decodeSASL decodes a packet related to SASL authentication.
+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 + "/>")
+	}
+}
+
+// decodeClient decodes all known packets in the client namespace.
+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 + "/>")
+	}
+}
+
+// decodeComponent decodes all known packets in the component namespace.
+func decodeComponent(p *xml.Decoder, se xml.StartElement) (Packet, error) {
+	switch se.Name.Local {
+	case "handshake": // handshake is used to authenticate components
+		return handshake.decode(p, se)
+	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 + "/>")
+	}
+}

stanza/pep.go

@@ -0,0 +1,27 @@
+package stanza
+
+import (
+	"encoding/xml"
+)
+
+type Tune struct {
+	XMLName xml.Name `xml:"http://jabber.org/protocol/tune tune"`
+	Artist  string   `xml:"artist,omitempty"`
+	Length  int      `xml:"length,omitempty"`
+	Rating  int      `xml:"rating,omitempty"`
+	Source  string   `xml:"source,omitempty"`
+	Title   string   `xml:"title,omitempty"`
+	Track   string   `xml:"track,omitempty"`
+	Uri     string   `xml:"uri,omitempty"`
+}
+
+// Mood defines deta model for XEP-0107 - User Mood
+// See: https://xmpp.org/extensions/xep-0107.html
+type Mood struct {
+	MsgExtension          // Mood can be added as a message extension
+	XMLName      xml.Name `xml:"http://jabber.org/protocol/mood mood"`
+	// TODO: Custom parsing to extract mood type from tag name.
+	// Note: the list is predefined.
+	// Mood type
+	Text string `xml:"text,omitempty"`
+}

stanza/pres_muc.go

@@ -0,0 +1,148 @@
+package stanza
+
+import (
+	"encoding/xml"
+	"strconv"
+	"time"
+)
+
+// ============================================================================
+// MUC Presence extension
+
+// MucPresence implements XEP-0045: Multi-User Chat - 19.1
+type MucPresence struct {
+	PresExtension
+	XMLName  xml.Name `xml:"http://jabber.org/protocol/muc x"`
+	Password string   `xml:"password,omitempty"`
+	History  History  `xml:"history,omitempty"`
+}
+
+const timeLayout = "2006-01-02T15:04:05Z"
+
+// History implements XEP-0045: Multi-User Chat - 19.1
+type History struct {
+	XMLName    xml.Name
+	MaxChars   NullableInt `xml:"maxchars,attr,omitempty"`
+	MaxStanzas NullableInt `xml:"maxstanzas,attr,omitempty"`
+	Seconds    NullableInt `xml:"seconds,attr,omitempty"`
+	Since      time.Time   `xml:"since,attr,omitempty"`
+}
+
+type NullableInt struct {
+	Value int
+	isSet bool
+}
+
+func NewNullableInt(val int) NullableInt {
+	return NullableInt{val, true}
+}
+
+func (n NullableInt) Get() (v int, ok bool) {
+	return n.Value, n.isSet
+}
+
+// UnmarshalXML implements custom parsing for history element
+func (h *History) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
+	h.XMLName = start.Name
+
+	// Extract attributes
+	for _, attr := range start.Attr {
+		switch attr.Name.Local {
+		case "maxchars":
+			v, err := strconv.Atoi(attr.Value)
+			if err != nil {
+				return err
+			}
+			h.MaxChars = NewNullableInt(v)
+		case "maxstanzas":
+			v, err := strconv.Atoi(attr.Value)
+			if err != nil {
+				return err
+			}
+			h.MaxStanzas = NewNullableInt(v)
+		case "seconds":
+			v, err := strconv.Atoi(attr.Value)
+			if err != nil {
+				return err
+			}
+			h.Seconds = NewNullableInt(v)
+		case "since":
+			t, err := time.Parse(timeLayout, attr.Value)
+			if err != nil {
+				return err
+			}
+			h.Since = t
+		}
+	}
+
+	// Consume remaining data until element end
+	for {
+		t, err := d.Token()
+		if err != nil {
+			return err
+		}
+
+		switch tt := t.(type) {
+		case xml.EndElement:
+			if tt == start.End() {
+				return nil
+			}
+		}
+	}
+}
+
+func (h History) MarshalXML(e *xml.Encoder, start xml.StartElement) (err error) {
+	mc, isMcSet := h.MaxChars.Get()
+	ms, isMsSet := h.MaxStanzas.Get()
+	s, isSSet := h.Seconds.Get()
+
+	// We do not have any value, ignore history element
+	if h.Since.IsZero() && !isMcSet && !isMsSet && !isSSet {
+		return nil
+	}
+
+	// Encode start element and attributes
+	start.Name = xml.Name{Local: "history"}
+
+	if isMcSet {
+		attr := xml.Attr{
+			Name:  xml.Name{Local: "maxchars"},
+			Value: strconv.Itoa(mc),
+		}
+		start.Attr = append(start.Attr, attr)
+	}
+
+	if isMsSet {
+		attr := xml.Attr{
+			Name:  xml.Name{Local: "maxstanzas"},
+			Value: strconv.Itoa(ms),
+		}
+		start.Attr = append(start.Attr, attr)
+	}
+
+	if isSSet {
+		attr := xml.Attr{
+			Name:  xml.Name{Local: "seconds"},
+			Value: strconv.Itoa(s),
+		}
+		start.Attr = append(start.Attr, attr)
+	}
+
+	if !h.Since.IsZero() {
+		attr := xml.Attr{
+			Name:  xml.Name{Local: "since"},
+			Value: h.Since.Format(timeLayout),
+		}
+		start.Attr = append(start.Attr, attr)
+	}
+	if err := e.EncodeToken(start); err != nil {
+		return err
+	}
+
+	return e.EncodeToken(xml.EndElement{Name: start.Name})
+
+}
+
+func init() {
+	TypeRegistry.MapExtension(PKTPresence, xml.Name{"http://jabber.org/protocol/muc", "x"}, MucPresence{})
+}

stanza/pres_muc_test.go

@@ -0,0 +1,97 @@
+package stanza_test
+
+import (
+	"encoding/xml"
+	"testing"
+
+	"gosrc.io/xmpp/stanza"
+)
+
+// https://xmpp.org/extensions/xep-0045.html#example-27
+func TestMucPassword(t *testing.T) {
+	str := `<presence
+    from='hag66@shakespeare.lit/pda'
+    id='djn4714'
+    to='coven@chat.shakespeare.lit/thirdwitch'>
+  <x xmlns='http://jabber.org/protocol/muc'>
+    <password>cauldronburn</password>
+  </x>
+</presence>`
+
+	var parsedPresence stanza.Presence
+	if err := xml.Unmarshal([]byte(str), &parsedPresence); err != nil {
+		t.Errorf("Unmarshal(%s) returned error", str)
+	}
+
+	var muc stanza.MucPresence
+	if ok := parsedPresence.Get(&muc); !ok {
+		t.Error("muc presence extension was not found")
+	}
+
+	if muc.Password != "cauldronburn" {
+		t.Errorf("incorrect password: '%s'", muc.Password)
+	}
+}
+
+// https://xmpp.org/extensions/xep-0045.html#example-37
+func TestMucHistory(t *testing.T) {
+	str := `<presence
+    from='hag66@shakespeare.lit/pda'
+    id='n13mt3l'
+    to='coven@chat.shakespeare.lit/thirdwitch'>
+  <x xmlns='http://jabber.org/protocol/muc'>
+    <history maxstanzas='20'/>
+  </x>
+</presence>`
+
+	var parsedPresence stanza.Presence
+	if err := xml.Unmarshal([]byte(str), &parsedPresence); err != nil {
+		t.Errorf("Unmarshal(%s) returned error: %s", str, err)
+		return
+	}
+
+	var muc stanza.MucPresence
+	if ok := parsedPresence.Get(&muc); !ok {
+		t.Error("muc presence extension was not found")
+		return
+	}
+
+	if v, ok := muc.History.MaxStanzas.Get(); !ok || v != 20 {
+		t.Errorf("incorrect MaxStanzas: '%#v'", muc.History.MaxStanzas)
+	}
+}
+
+// https://xmpp.org/extensions/xep-0045.html#example-37
+func TestMucNoHistory(t *testing.T) {
+	str := "<presence" +
+		" id=\"n13mt3l\"" +
+		" from=\"hag66@shakespeare.lit/pda\"" +
+		" to=\"coven@chat.shakespeare.lit/thirdwitch\">" +
+		"<x xmlns=\"http://jabber.org/protocol/muc\">" +
+		"<history maxstanzas=\"0\"></history>" +
+		"</x>" +
+		"</presence>"
+
+	maxstanzas := 0
+
+	pres := stanza.Presence{Attrs: stanza.Attrs{
+		From: "hag66@shakespeare.lit/pda",
+		Id:   "n13mt3l",
+		To:   "coven@chat.shakespeare.lit/thirdwitch",
+	},
+		Extensions: []stanza.PresExtension{
+			stanza.MucPresence{
+				History: stanza.History{MaxStanzas: stanza.NewNullableInt(maxstanzas)},
+			},
+		},
+	}
+	data, err := xml.Marshal(&pres)
+	if err != nil {
+		t.Error("error on encode:", err)
+		return
+	}
+
+	if string(data) != str {
+		t.Errorf("incorrect stanza: \n%s\n%s", str, data)
+	}
+}

stanza/presence.go

@@ -0,0 +1,139 @@
+package stanza
+
+import (
+	"encoding/xml"
+	"reflect"
+)
+
+// ============================================================================
+// Presence Packet
+
+// Presence implements RFC 6120 - A.5 Client Namespace (a part)
+type Presence struct {
+	XMLName xml.Name `xml:"presence"`
+	Attrs
+	Show       PresenceShow    `xml:"show,omitempty"`
+	Status     string          `xml:"status,omitempty"`
+	Priority   int8            `xml:"priority,omitempty"` // default: 0
+	Error      Err             `xml:"error,omitempty"`
+	Extensions []PresExtension `xml:",omitempty"`
+}
+
+func (Presence) Name() string {
+	return "presence"
+}
+
+func NewPresence(a Attrs) Presence {
+	return Presence{
+		XMLName: xml.Name{Local: "presence"},
+		Attrs:   a,
+	}
+}
+
+// Get search and extracts a specific extension on a presence stanza.
+// It receives a pointer to an PresExtension. It will panic if the caller
+// does not pass a pointer.
+// It will return true if the passed extension is found and set the pointer
+// to the extension passed as parameter to the found extension.
+// It will return false if the extension is not found on the presence.
+//
+// Example usage:
+//   var muc xmpp.MucPresence
+//   if ok := msg.Get(&muc); ok {
+//     // muc presence extension has been found
+//	 }
+func (pres *Presence) Get(ext PresExtension) bool {
+	target := reflect.ValueOf(ext)
+	if target.Kind() != reflect.Ptr {
+		panic("you must pass a pointer to the message Get method")
+	}
+
+	for _, e := range pres.Extensions {
+		if reflect.TypeOf(e) == target.Type() {
+			source := reflect.ValueOf(e)
+			if source.Kind() != reflect.Ptr {
+				source = source.Elem()
+			}
+			target.Elem().Set(source.Elem())
+			return true
+		}
+	}
+	return false
+}
+
+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)
+	// TODO Add default presence type (when omitted)
+	return packet, err
+}
+
+// UnmarshalXML implements custom parsing for presence stanza
+func (pres *Presence) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
+	pres.XMLName = start.Name
+
+	// Extract packet attributes
+	for _, attr := range start.Attr {
+		if attr.Name.Local == "id" {
+			pres.Id = attr.Value
+		}
+		if attr.Name.Local == "type" {
+			pres.Type = StanzaType(attr.Value)
+		}
+		if attr.Name.Local == "to" {
+			pres.To = attr.Value
+		}
+		if attr.Name.Local == "from" {
+			pres.From = attr.Value
+		}
+		if attr.Name.Local == "lang" {
+			pres.Lang = attr.Value
+		}
+	}
+
+	// decode inner elements
+	for {
+		t, err := d.Token()
+		if err != nil {
+			return err
+		}
+
+		switch tt := t.(type) {
+
+		case xml.StartElement:
+			if presExt := TypeRegistry.GetPresExtension(tt.Name); presExt != nil {
+				// Decode message extension
+				err = d.DecodeElement(presExt, &tt)
+				if err != nil {
+					return err
+				}
+				pres.Extensions = append(pres.Extensions, presExt)
+			} else {
+				// Decode standard message sub-elements
+				var err error
+				switch tt.Name.Local {
+				case "show":
+					err = d.DecodeElement(&pres.Show, &tt)
+				case "status":
+					err = d.DecodeElement(&pres.Status, &tt)
+				case "priority":
+					err = d.DecodeElement(&pres.Priority, &tt)
+				case "error":
+					err = d.DecodeElement(&pres.Error, &tt)
+				}
+				if err != nil {
+					return err
+				}
+			}
+
+		case xml.EndElement:
+			if tt == start.End() {
+				return nil
+			}
+		}
+	}
+}

stanza/presence_enum.go

@@ -0,0 +1,12 @@
+package stanza
+
+// PresenceShow is a Enum of presence element show
+type PresenceShow string
+
+// RFC 6120: part of A.5 Client Namespace and A.6 Server Namespace
+const (
+	PresenceShowAway PresenceShow = "away"
+	PresenceShowChat PresenceShow = "chat"
+	PresenceShowDND  PresenceShow = "dnd"
+	PresenceShowXA   PresenceShow = "xa"
+)

stanza/presence_test.go

@@ -0,0 +1,63 @@
+package stanza_test
+
+import (
+	"encoding/xml"
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+	"gosrc.io/xmpp/stanza"
+)
+
+func TestGeneratePresence(t *testing.T) {
+	presence := stanza.NewPresence(stanza.Attrs{From: "admin@localhost", To: "test@localhost", Id: "1"})
+	presence.Show = stanza.PresenceShowChat
+
+	data, err := xml.Marshal(presence)
+	if err != nil {
+		t.Errorf("cannot marshal xml structure")
+	}
+
+	var parsedPresence stanza.Presence
+	if err = xml.Unmarshal(data, &parsedPresence); err != nil {
+		t.Errorf("Unmarshal(%s) returned error", data)
+	}
+
+	if !xmlEqual(parsedPresence, presence) {
+		t.Errorf("non matching items\n%s", cmp.Diff(parsedPresence, presence))
+	}
+}
+
+func TestPresenceSubElt(t *testing.T) {
+	// Test structure to ensure that show, status and priority are correctly defined as presence
+	// package sub-elements
+	type pres struct {
+		Show     stanza.PresenceShow `xml:"show"`
+		Status   string              `xml:"status"`
+		Priority int8                `xml:"priority"`
+	}
+
+	presence := stanza.NewPresence(stanza.Attrs{From: "admin@localhost", To: "test@localhost", Id: "1"})
+	presence.Show = stanza.PresenceShowXA
+	presence.Status = "Coding"
+	presence.Priority = 10
+
+	data, err := xml.Marshal(presence)
+	if err != nil {
+		t.Errorf("cannot marshal xml structure")
+	}
+
+	var parsedPresence pres
+	if err = xml.Unmarshal(data, &parsedPresence); err != nil {
+		t.Errorf("Unmarshal(%s) returned error", data)
+	}
+
+	if parsedPresence.Show != presence.Show {
+		t.Errorf("cannot read 'show' as presence subelement (%s)", parsedPresence.Show)
+	}
+	if parsedPresence.Status != presence.Status {
+		t.Errorf("cannot read 'status' as presence subelement (%s)", parsedPresence.Status)
+	}
+	if parsedPresence.Priority != presence.Priority {
+		t.Errorf("cannot read 'priority' as presence subelement (%d)", parsedPresence.Priority)
+	}
+}

stanza/pubsub.go

@@ -0,0 +1,40 @@
+package stanza
+
+import (
+	"encoding/xml"
+)
+
+type PubSub struct {
+	XMLName xml.Name `xml:"http://jabber.org/protocol/pubsub pubsub"`
+	Publish *Publish
+	Retract *Retract
+	// TODO <configure/>
+}
+
+func (p *PubSub) Namespace() string {
+	return p.XMLName.Space
+}
+
+type Publish struct {
+	XMLName xml.Name `xml:"publish"`
+	Node    string   `xml:"node,attr"`
+	Item    Item
+}
+
+type Item struct {
+	XMLName xml.Name `xml:"item"`
+	Id      string   `xml:"id,attr,omitempty"`
+	Tune    *Tune
+	Mood    *Mood
+}
+
+type Retract struct {
+	XMLName xml.Name `xml:"retract"`
+	Node    string   `xml:"node,attr"`
+	Notify  string   `xml:"notify,attr"`
+	Item    Item
+}
+
+func init() {
+	TypeRegistry.MapExtension(PKTIQ, xml.Name{"http://jabber.org/protocol/pubsub", "pubsub"}, PubSub{})
+}

stanza/registry.go

@@ -0,0 +1,119 @@
+package stanza
+
+import (
+	"encoding/xml"
+	"reflect"
+	"sync"
+)
+
+type MsgExtension interface{}
+type PresExtension interface{}
+
+// The Registry for msg and IQ types is a global variable.
+// TODO: Move to the client init process to remove the dependency on a global variable.
+//   That should make it possible to be able to share the decoder.
+// TODO: Ensure that a client can add its own custom namespace to the registry (or overload existing ones).
+
+type PacketType uint8
+
+const (
+	PKTPresence PacketType = iota
+	PKTMessage
+	PKTIQ
+)
+
+var TypeRegistry = newRegistry()
+
+// We store different registries per packet type and namespace.
+type registryKey struct {
+	packetType PacketType
+	namespace  string
+}
+
+type registryForNamespace map[string]reflect.Type
+
+type registry struct {
+	// We store different registries per packet type and namespace.
+	msgTypes map[registryKey]registryForNamespace
+	// Handle concurrent access
+	msgTypesLock *sync.RWMutex
+}
+
+func newRegistry() *registry {
+	return &registry{
+		msgTypes:     make(map[registryKey]registryForNamespace),
+		msgTypesLock: &sync.RWMutex{},
+	}
+}
+
+// MapExtension stores extension type for packet payload.
+// The match is done per PacketType (iq, message, or presence) and XML tag name.
+// You can use the alias "*" as local XML name to be able to match all unknown tag name for that
+// packet type and namespace.
+func (r *registry) MapExtension(pktType PacketType, name xml.Name, extension MsgExtension) {
+	key := registryKey{pktType, name.Space}
+	r.msgTypesLock.RLock()
+	store := r.msgTypes[key]
+	r.msgTypesLock.RUnlock()
+
+	r.msgTypesLock.Lock()
+	defer r.msgTypesLock.Unlock()
+	if store == nil {
+		store = make(map[string]reflect.Type)
+	}
+	store[name.Local] = reflect.TypeOf(extension)
+	r.msgTypes[key] = store
+}
+
+// GetExtensionType returns extension type for packet payload, based on packet type and tag name.
+func (r *registry) GetExtensionType(pktType PacketType, name xml.Name) reflect.Type {
+	key := registryKey{pktType, name.Space}
+
+	r.msgTypesLock.RLock()
+	defer r.msgTypesLock.RUnlock()
+	store := r.msgTypes[key]
+	result := store[name.Local]
+	if result == nil && name.Local != "*" {
+		return store["*"]
+	}
+	return result
+}
+
+// GetPresExtension returns an instance of PresExtension, by matching packet type and XML
+// tag name against the registry.
+func (r *registry) GetPresExtension(name xml.Name) PresExtension {
+	if extensionType := r.GetExtensionType(PKTPresence, name); extensionType != nil {
+		val := reflect.New(extensionType)
+		elt := val.Interface()
+		if presExt, ok := elt.(PresExtension); ok {
+			return presExt
+		}
+	}
+	return nil
+}
+
+// GetMsgExtension returns an instance of MsgExtension, by matching packet type and XML
+// tag name against the registry.
+func (r *registry) GetMsgExtension(name xml.Name) MsgExtension {
+	if extensionType := r.GetExtensionType(PKTMessage, name); extensionType != nil {
+		val := reflect.New(extensionType)
+		elt := val.Interface()
+		if msgExt, ok := elt.(MsgExtension); ok {
+			return msgExt
+		}
+	}
+	return nil
+}
+
+// GetIQExtension returns an instance of IQPayload, by matching packet type and XML
+// tag name against the registry.
+func (r *registry) GetIQExtension(name xml.Name) IQPayload {
+	if extensionType := r.GetExtensionType(PKTIQ, name); extensionType != nil {
+		val := reflect.New(extensionType)
+		elt := val.Interface()
+		if iqExt, ok := elt.(IQPayload); ok {
+			return iqExt
+		}
+	}
+	return nil
+}

stanza/registry_test.go

@@ -0,0 +1,47 @@
+package stanza
+
+import (
+	"encoding/xml"
+	"reflect"
+	"testing"
+)
+
+func TestRegistry_RegisterMsgExt(t *testing.T) {
+	// Setup registry
+	typeRegistry := newRegistry()
+
+	// Register an element
+	name := xml.Name{Space: "urn:xmpp:receipts", Local: "request"}
+	typeRegistry.MapExtension(PKTMessage, name, ReceiptRequest{})
+
+	// Match that element
+	receipt := typeRegistry.GetMsgExtension(name)
+	if receipt == nil {
+		t.Error("cannot read element type from registry")
+		return
+	}
+
+	switch r := receipt.(type) {
+	case *ReceiptRequest:
+	default:
+		t.Errorf("Registry did not return expected type ReceiptRequest: %v", reflect.TypeOf(r))
+	}
+}
+
+func BenchmarkRegistryGet(b *testing.B) {
+	// Setup registry
+	typeRegistry := newRegistry()
+
+	// Register an element
+	name := xml.Name{Space: "urn:xmpp:receipts", Local: "request"}
+	typeRegistry.MapExtension(PKTMessage, name, ReceiptRequest{})
+
+	for i := 0; i < b.N; i++ {
+		// Match that element
+		receipt := typeRegistry.GetExtensionType(PKTMessage, name)
+		if receipt == nil {
+			b.Error("cannot read element type from registry")
+			return
+		}
+	}
+}

stanza/sasl_auth.go

@@ -0,0 +1,112 @@
+package stanza
+
+import "encoding/xml"
+
+// ============================================================================
+
+// SASLAuth implements SASL Authentication initiation.
+// Reference: https://tools.ietf.org/html/rfc6120#section-6.4.2
+type SASLAuth struct {
+	XMLName   xml.Name `xml:"urn:ietf:params:xml:ns:xmpp-sasl auth"`
+	Mechanism string   `xml:"mechanism,attr"`
+	Value     string   `xml:",innerxml"`
+}
+
+// ============================================================================
+
+// SASLSuccess implements SASL Success nonza, sent by server as a result of the
+// SASL auth negotiation.
+// Reference: https://tools.ietf.org/html/rfc6120#section-6.4.6
+type SASLSuccess struct {
+	XMLName xml.Name `xml:"urn:ietf:params:xml:ns:xmpp-sasl success"`
+}
+
+func (SASLSuccess) Name() string {
+	return "sasl:success"
+}
+
+// SASLSuccess decoding
+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"
+}
+
+// SASLFailure decoding
+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
+}
+
+// ===========================================================================
+// Resource binding
+
+// Bind is an IQ payload used during session negotiation to bind user resource
+// to the current XMPP stream.
+// Reference: https://tools.ietf.org/html/rfc6120#section-7
+type Bind struct {
+	XMLName  xml.Name `xml:"urn:ietf:params:xml:ns:xmpp-bind bind"`
+	Resource string   `xml:"resource,omitempty"`
+	Jid      string   `xml:"jid,omitempty"`
+}
+
+func (b *Bind) Namespace() string {
+	return b.XMLName.Space
+}
+
+// ============================================================================
+// Session (Obsolete)
+
+// Session is both a stream feature and an obsolete IQ Payload, used to bind a
+// resource to the current XMPP stream on RFC 3121 only XMPP servers.
+// Session is obsolete in RFC 6121. It is added to Fluux XMPP for compliance
+// with RFC 3121.
+// Reference: https://xmpp.org/rfcs/rfc3921.html#session
+//
+// This is the draft defining how to handle the transition:
+//    https://tools.ietf.org/html/draft-cridland-xmpp-session-01
+type StreamSession struct {
+	XMLName  xml.Name `xml:"urn:ietf:params:xml:ns:xmpp-session session"`
+	Optional bool     // If element does exist, it mean we are not required to open session
+}
+
+func (s *StreamSession) Namespace() string {
+	return s.XMLName.Space
+}
+
+func (s *StreamSession) IsOptional() bool {
+	if s.XMLName.Local == "session" {
+		return s.Optional
+	}
+	// If session element is missing, then we should not use session
+	return true
+}
+
+// ============================================================================
+// Registry init
+
+func init() {
+	TypeRegistry.MapExtension(PKTIQ, xml.Name{"urn:ietf:params:xml:ns:xmpp-bind", "bind"}, Bind{})
+	TypeRegistry.MapExtension(PKTIQ, xml.Name{"urn:ietf:params:xml:ns:xmpp-session", "session"}, StreamSession{})
+}

stanza/sasl_auth_test.go

@@ -0,0 +1,57 @@
+package stanza_test
+
+import (
+	"encoding/xml"
+	"testing"
+
+	"gosrc.io/xmpp/stanza"
+)
+
+// Check that we can detect optional session from advertised stream features
+func TestSessionFeatures(t *testing.T) {
+	streamFeatures := stanza.StreamFeatures{Session: stanza.StreamSession{Optional: true}}
+
+	data, err := xml.Marshal(streamFeatures)
+	if err != nil {
+		t.Errorf("cannot marshal xml structure: %s", err)
+	}
+
+	parsedStream := stanza.StreamFeatures{}
+	if err = xml.Unmarshal(data, &parsedStream); err != nil {
+		t.Errorf("Unmarshal(%s) returned error: %s", data, err)
+	}
+
+	if !parsedStream.Session.IsOptional() {
+		t.Error("Session should be optional")
+	}
+}
+
+// Check that the Session tag can be used in IQ decoding
+func TestSessionIQ(t *testing.T) {
+	iq := stanza.NewIQ(stanza.Attrs{Type: stanza.IQTypeSet, Id: "session"})
+	iq.Payload = &stanza.StreamSession{XMLName: xml.Name{Local: "session"}, Optional: true}
+
+	data, err := xml.Marshal(iq)
+	if err != nil {
+		t.Errorf("cannot marshal xml structure: %s", err)
+		return
+	}
+
+	parsedIQ := stanza.IQ{}
+	if err = xml.Unmarshal(data, &parsedIQ); err != nil {
+		t.Errorf("Unmarshal(%s) returned error: %s", data, err)
+		return
+	}
+
+	session, ok := parsedIQ.Payload.(*stanza.StreamSession)
+	if !ok {
+		t.Error("Missing session payload")
+		return
+	}
+
+	if !session.IsOptional() {
+		t.Error("Session should be optional")
+	}
+}
+
+// TODO Test Sasl mechanism

stanza/starttls.go

@@ -0,0 +1,14 @@
+package stanza
+
+import (
+	"encoding/xml"
+)
+
+// Used during stream initiation / session establishment
+type TLSProceed struct {
+	XMLName xml.Name `xml:"urn:ietf:params:xml:ns:xmpp-tls proceed"`
+}
+
+type tlsFailure struct {
+	XMLName xml.Name `xml:"urn:ietf:params:xml:ns:xmpp-tls failure"`
+}

stanza/stream.go

@@ -0,0 +1,167 @@
+package stanza
+
+import (
+	"encoding/xml"
+)
+
+// ============================================================================
+// StreamFeatures Packet
+// Reference: The active stream features are published on
+//            https://xmpp.org/registrar/stream-features.html
+// Note: That page misses draft and experimental XEP (i.e CSI, etc)
+
+type StreamFeatures struct {
+	XMLName xml.Name `xml:"http://etherx.jabber.org/streams features"`
+	// Server capabilities hash
+	Caps Caps
+	// Stream features
+	StartTLS         tlsStartTLS
+	Mechanisms       saslMechanisms
+	Bind             Bind
+	StreamManagement streamManagement
+	// Obsolete
+	Session StreamSession
+	// ProcessOne Stream Features
+	P1Push   p1Push
+	P1Rebind p1Rebind
+	p1Ack    p1Ack
+	Any      []xml.Name `xml:",any"`
+}
+
+func (StreamFeatures) Name() string {
+	return "stream:features"
+}
+
+type streamFeatureDecoder struct{}
+
+var streamFeatures streamFeatureDecoder
+
+func (streamFeatureDecoder) decode(p *xml.Decoder, se xml.StartElement) (StreamFeatures, error) {
+	var packet StreamFeatures
+	err := p.DecodeElement(&packet, &se)
+	return packet, err
+}
+
+// Capabilities
+// Reference: https://xmpp.org/extensions/xep-0115.html#stream
+//    "A server MAY include its entity capabilities in a stream feature element so that connecting clients
+//     and peer servers do not need to send service discovery requests each time they connect."
+// This is not a stream feature but a way to let client cache server disco info.
+type Caps struct {
+	XMLName xml.Name `xml:"http://jabber.org/protocol/caps c"`
+	Hash    string   `xml:"hash,attr"`
+	Node    string   `xml:"node,attr"`
+	Ver     string   `xml:"ver,attr"`
+	Ext     string   `xml:"ext,attr,omitempty"`
+}
+
+// ============================================================================
+// Supported Stream Features
+
+// StartTLS feature
+// Reference: RFC 6120 - https://tools.ietf.org/html/rfc6120#section-5.4
+type tlsStartTLS struct {
+	XMLName  xml.Name `xml:"urn:ietf:params:xml:ns:xmpp-tls starttls"`
+	Required bool
+}
+
+// UnmarshalXML implements custom parsing startTLS required flag
+func (stls *tlsStartTLS) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
+	stls.XMLName = start.Name
+
+	// 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:
+			elt := new(Node)
+
+			err = d.DecodeElement(elt, &tt)
+			if err != nil {
+				return err
+			}
+
+			if elt.XMLName.Local == "required" {
+				stls.Required = true
+			}
+
+		case xml.EndElement:
+			if tt == start.End() {
+				return nil
+			}
+		}
+	}
+}
+
+func (sf *StreamFeatures) DoesStartTLS() (feature tlsStartTLS, isSupported bool) {
+	if sf.StartTLS.XMLName.Space+" "+sf.StartTLS.XMLName.Local == nsTLS+" starttls" {
+		return sf.StartTLS, true
+	}
+	return feature, false
+}
+
+// Mechanisms
+// Reference: RFC 6120 - https://tools.ietf.org/html/rfc6120#section-6.4.1
+type saslMechanisms struct {
+	XMLName   xml.Name `xml:"urn:ietf:params:xml:ns:xmpp-sasl mechanisms"`
+	Mechanism []string `xml:"mechanism"`
+}
+
+// StreamManagement
+// Reference: XEP-0198 - https://xmpp.org/extensions/xep-0198.html#feature
+type streamManagement struct {
+	XMLName xml.Name `xml:"urn:xmpp:sm:3 sm"`
+}
+
+func (sf *StreamFeatures) DoesStreamManagement() (isSupported bool) {
+	if sf.StreamManagement.XMLName.Space+" "+sf.StreamManagement.XMLName.Local == "urn:xmpp:sm:3 sm" {
+		return true
+	}
+	return false
+}
+
+// P1 extensions
+// Reference: https://docs.ejabberd.im/developer/mobile/core-features/
+
+// p1:push support
+type p1Push struct {
+	XMLName xml.Name `xml:"p1:push push"`
+}
+
+// p1:rebind suppor
+type p1Rebind struct {
+	XMLName xml.Name `xml:"p1:rebind rebind"`
+}
+
+// p1:ack support
+type p1Ack struct {
+	XMLName xml.Name `xml:"p1:ack ack"`
+}
+
+// ============================================================================
+// StreamError Packet
+
+type StreamError struct {
+	XMLName xml.Name `xml:"http://etherx.jabber.org/streams error"`
+	Error   xml.Name `xml:",any"`
+	Text    string   `xml:"urn:ietf:params:xml:ns:xmpp-streams text"`
+}
+
+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
+}

stanza/stream_management.go

@@ -0,0 +1,121 @@
+package stanza
+
+import (
+	"encoding/xml"
+	"errors"
+)
+
+const (
+	NSStreamManagement = "urn:xmpp:sm:3"
+)
+
+// Enabled as defined in Stream Management spec
+// Reference: https://xmpp.org/extensions/xep-0198.html#enable
+type SMEnabled struct {
+	XMLName  xml.Name `xml:"urn:xmpp:sm:3 enabled"`
+	Id       string   `xml:"id,attr,omitempty"`
+	Location string   `xml:"location,attr,omitempty"`
+	Resume   string   `xml:"resume,attr,omitempty"`
+	Max      uint     `xml:"max,attr,omitempty"`
+}
+
+func (SMEnabled) Name() string {
+	return "Stream Management: enabled"
+}
+
+// Request as defined in Stream Management spec
+// Reference: https://xmpp.org/extensions/xep-0198.html#acking
+type SMRequest struct {
+	XMLName xml.Name `xml:"urn:xmpp:sm:3 r"`
+}
+
+func (SMRequest) Name() string {
+	return "Stream Management: request"
+}
+
+// Answer as defined in Stream Management spec
+// Reference: https://xmpp.org/extensions/xep-0198.html#acking
+type SMAnswer struct {
+	XMLName xml.Name `xml:"urn:xmpp:sm:3 a"`
+	H       uint     `xml:"h,attr,omitempty"`
+}
+
+func (SMAnswer) Name() string {
+	return "Stream Management: answer"
+}
+
+// Resumed as defined in Stream Management spec
+// Reference: https://xmpp.org/extensions/xep-0198.html#acking
+type SMResumed struct {
+	XMLName xml.Name `xml:"urn:xmpp:sm:3 resumed"`
+	PrevId  string   `xml:"previd,attr,omitempty"`
+	H       uint     `xml:"h,attr,omitempty"`
+}
+
+func (SMResumed) Name() string {
+	return "Stream Management: resumed"
+}
+
+// Failed as defined in Stream Management spec
+// Reference: https://xmpp.org/extensions/xep-0198.html#acking
+type SMFailed struct {
+	XMLName xml.Name `xml:"urn:xmpp:sm:3 failed"`
+	// TODO: Handle decoding error cause (need custom parsing).
+}
+
+func (SMFailed) Name() string {
+	return "Stream Management: failed"
+}
+
+type smDecoder struct{}
+
+var sm smDecoder
+
+// decode decodes all known nonza in the stream management namespace.
+func (s smDecoder) decode(p *xml.Decoder, se xml.StartElement) (Packet, error) {
+	switch se.Name.Local {
+	case "enabled":
+		return s.decodeEnabled(p, se)
+	case "resumed":
+		return s.decodeResumed(p, se)
+	case "r":
+		return s.decodeRequest(p, se)
+	case "h":
+		return s.decodeAnswer(p, se)
+	case "failed":
+		return s.decodeFailed(p, se)
+	default:
+		return nil, errors.New("unexpected XMPP packet " +
+			se.Name.Space + " <" + se.Name.Local + "/>")
+	}
+}
+
+func (smDecoder) decodeEnabled(p *xml.Decoder, se xml.StartElement) (SMEnabled, error) {
+	var packet SMEnabled
+	err := p.DecodeElement(&packet, &se)
+	return packet, err
+}
+
+func (smDecoder) decodeResumed(p *xml.Decoder, se xml.StartElement) (SMResumed, error) {
+	var packet SMResumed
+	err := p.DecodeElement(&packet, &se)
+	return packet, err
+}
+
+func (smDecoder) decodeRequest(p *xml.Decoder, se xml.StartElement) (SMRequest, error) {
+	var packet SMRequest
+	err := p.DecodeElement(&packet, &se)
+	return packet, err
+}
+
+func (smDecoder) decodeAnswer(p *xml.Decoder, se xml.StartElement) (SMAnswer, error) {
+	var packet SMAnswer
+	err := p.DecodeElement(&packet, &se)
+	return packet, err
+}
+
+func (smDecoder) decodeFailed(p *xml.Decoder, se xml.StartElement) (SMFailed, error) {
+	var packet SMFailed
+	err := p.DecodeElement(&packet, &se)
+	return packet, err
+}