xmpp/layer3.go
author Chris Jones <christian.jones@sri.com>
Sun, 15 Sep 2013 16:18:20 -0600
changeset 148 b1b4900eee5b
parent 147 d7679d991b17
child 149 22c96a9ab289
permissions -rw-r--r--
Made layers 1 and 3 more modular, shrinking the surface area of the coupling between them.
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// This layer of the XMPP protocol reads XMLish structures and
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// responds to them. It negotiates TLS and authentication.
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package xmpp
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import (
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	"encoding/xml"
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	"fmt"
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)
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// Callback to handle a stanza with a particular id.
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type callback struct {
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	id string
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	// Return true means pass this to the application
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	f func(Stanza) bool
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}
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// Receive XMLish structures, handle all the stream-related ones, and
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// send XMPP stanzas on to the client.
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func (cl *Client) recvStream(recvXml <-chan interface{}, sendXmpp chan<- Stanza) {
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	defer close(sendXmpp)
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	handlers := make(map[string]func(Stanza) bool)
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Loop:
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	for {
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		select {
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		case h := <-cl.handlers:
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			handlers[h.id] = h.f
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		case x, ok := <-recvXml:
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			if !ok {
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				break Loop
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			}
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			switch obj := x.(type) {
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			case *stream:
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				handleStream(obj)
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			case *streamError:
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				cl.handleStreamError(obj)
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			case *Features:
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				cl.handleFeatures(obj)
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			case *starttls:
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				cl.handleTls(obj)
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			case *auth:
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				cl.handleSasl(obj)
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			case Stanza:
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				send := true
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				id := obj.GetHeader().Id
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				if handlers[id] != nil {
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					f := handlers[id]
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					delete(handlers, id)
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					send = f(obj)
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				}
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				if send {
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					sendXmpp <- obj
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				}
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			default:
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				Warn.Logf("Unhandled non-stanza: %T %#v", x, x)
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			}
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		}
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	}
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}
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// Receive XMPP stanzas from the client and send them on to the
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// remote. Don't allow the client to send us any stanzas until
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// negotiation has completed.  This loop is paused until resource
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// binding is complete. Otherwise the app might inject something
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// inappropriate into our negotiations with the server. The control
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// channel controls this loop's activity.
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func sendStream(sendXml chan<- interface{}, recvXmpp <-chan Stanza,
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	control <-chan sendCmd) {
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	defer close(sendXml)
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	var input <-chan Stanza
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	for {
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		select {
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		case cmd := <-control:
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			switch cmd {
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			case sendDeny:
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				input = nil
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			case sendAllow:
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				input = recvXmpp
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			case sendAbort:
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				return
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			default:
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				panic(fmt.Sprintf("unknown cmd %d", cmd))
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			}
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		case x, ok := <-input:
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			if !ok {
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				return
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			}
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			if x == nil {
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				Info.Log("Refusing to send nil stanza")
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				continue
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			}
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			sendXml <- x
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		}
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	}
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}
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func handleStream(ss *stream) {
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}
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func (cl *Client) handleStreamError(se *streamError) {
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	Info.Logf("Received stream error: %v", se)
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	cl.inputControl <- sendAbort
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}
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func (cl *Client) handleFeatures(fe *Features) {
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	cl.Features = fe
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	if fe.Starttls != nil {
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		start := &starttls{XMLName: xml.Name{Space: NsTLS,
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			Local: "starttls"}}
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		cl.sendXml <- start
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		return
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	}
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	if len(fe.Mechanisms.Mechanism) > 0 {
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		cl.chooseSasl(fe)
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		return
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	}
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	if fe.Bind != nil {
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		cl.bind(fe.Bind)
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		return
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	}
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}
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func (cl *Client) handleTls(t *starttls) {
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	cl.layer1.startTls(&cl.tlsConfig)
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	// Now re-send the initial handshake message to start the new
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	// session.
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	cl.sendXml <- &stream{To: cl.Jid.Domain, Version: XMPPVersion}
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}
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// Register a callback to handle the next XMPP stanza (iq, message, or
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// presence) with a given id. The provided function will not be called
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// more than once. If it returns false, the stanza will not be made
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// available on the normal Client.Recv channel. The callback must not
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// read from that channel, as deliveries on it cannot proceed until
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// the handler returns true or false.
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func (cl *Client) SetCallback(id string, f func(Stanza) bool) {
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	h := &callback{id: id, f: f}
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	cl.handlers <- h
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}
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// Send a request to bind a resource. RFC 3920, section 7.
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func (cl *Client) bind(bindAdv *bindIq) {
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	res := cl.Jid.Resource
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	bindReq := &bindIq{}
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	if res != "" {
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		bindReq.Resource = &res
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	}
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	msg := &Iq{Header: Header{Type: "set", Id: NextId(),
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		Nested: []interface{}{bindReq}}}
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	f := func(st Stanza) bool {
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		iq, ok := st.(*Iq)
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		if !ok {
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			Warn.Log("non-iq response")
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		}
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		if iq.Type == "error" {
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			Warn.Log("Resource binding failed")
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			return false
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		}
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		var bindRepl *bindIq
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		for _, ele := range iq.Nested {
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			if b, ok := ele.(*bindIq); ok {
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				bindRepl = b
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				break
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			}
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		}
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		if bindRepl == nil {
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			Warn.Logf("Bad bind reply: %#v", iq)
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			return false
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		}
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		jidStr := bindRepl.Jid
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		if jidStr == nil || *jidStr == "" {
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			Warn.Log("Can't bind empty resource")
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			return false
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		}
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		jid := new(JID)
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		if err := jid.Set(*jidStr); err != nil {
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			Warn.Logf("Can't parse JID %s: %s", *jidStr, err)
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			return false
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		}
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		cl.Jid = *jid
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		Info.Logf("Bound resource: %s", cl.Jid.String())
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		cl.bindDone()
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		return false
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	}
144
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	cl.SetCallback(msg.Id, f)
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	cl.sendXml <- msg
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}