# Fluux XMPP

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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. Fluux XMPP supports:
  - [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)

The library is designed to have minimal dependencies. For now, the library does not depend on any other library.

## 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)