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package xmpp
import (
"encoding/xml"
"io"
"net"
"strings"
"github.com/twstrike/coyim/tls"
"github.com/twstrike/coyim/xmpp/data"
"github.com/twstrike/coyim/xmpp/interfaces"
"golang.org/x/net/proxy"
)
// A dialer connects and authenticates to an XMPP server
type dialer struct {
// JID represents the user's "bare JID" as specified in RFC 6120
JID string
// password used to authenticate to the server
password string
// serverAddress associates a particular FQDN with the origin domain specified by the JID.
serverAddress string
// proxy configures a proxy used to connect to the server
proxy proxy.Dialer
// config configures the XMPP protocol
config data.Config
verifier tls.Verifier
}
// DialerFactory returns a new xmpp dialer
func DialerFactory(verifier tls.Verifier) interfaces.Dialer {
return &dialer{verifier: verifier}
}
func (d *dialer) SetJID(v string) {
d.JID = v
}
func (d *dialer) SetServerAddress(v string) {
d.serverAddress = v
}
func (d *dialer) SetPassword(v string) {
d.password = v
}
func (d *dialer) SetProxy(v proxy.Dialer) {
d.proxy = v
}
func (d *dialer) SetConfig(v data.Config) {
d.config = v
}
func (d *dialer) Config() data.Config {
return d.config
}
func (d *dialer) ServerAddress() string {
return d.serverAddress
}
func (d *dialer) hasCustomServer() bool {
return d.serverAddress != ""
}
func (d *dialer) getJIDLocalpart() string {
parts := strings.SplitN(d.JID, "@", 2)
return parts[0]
}
func (d *dialer) getJIDDomainpart() string {
//TODO: remove any existing resourcepart although our doc says it is a bare JID (without resourcepart) but it would be nice
parts := strings.SplitN(d.JID, "@", 2)
return parts[1]
}
// GetServer returns the "hardcoded" server chosen if available, otherwise returns the domainpart from the JID. The server contains port information
func (d *dialer) GetServer() string {
if d.hasCustomServer() {
return d.serverAddress
}
return d.getFallbackServer()
}
func (d *dialer) getFallbackServer() string {
return net.JoinHostPort(d.getJIDDomainpart(), "5222")
}
// RegisterAccount registers an account on the server. The formCallback is used to handle XMPP forms.
func (d *dialer) RegisterAccount(formCallback data.FormCallback) (interfaces.Conn, error) {
//TODO: notify in case the feature is not supported
d.config.CreateCallback = formCallback
return d.Dial()
}
// Dial creates a new connection to an XMPP server with the given proxy
// and authenticates as the given user.
func (d *dialer) Dial() (interfaces.Conn, error) {
// Starting an XMPP connection comprises two parts:
// - Opening a transport channel (TCP)
// - Opening an XML stream over the transport channel
// RFC 6120, section 3
conn, err := d.newTCPConn()
if err != nil {
return nil, err
}
// RFC 6120, section 4
return d.setupStream(conn)
}
// RFC 6120, Section 4.2
func (d *dialer) setupStream(conn net.Conn) (interfaces.Conn, error) {
c := newConn()
c.config = d.config
c.originDomain = d.getJIDDomainpart()
d.bindTransport(c, conn)
if err := d.negotiateStreamFeatures(c, conn); err != nil {
return nil, err
}
go c.watchKeepAlive(conn)
go c.watchPings()
return c, nil
}
// RFC 6120, section 4.3.2
func (d *dialer) negotiateStreamFeatures(c interfaces.Conn, conn net.Conn) error {
if err := c.SendInitialStreamHeader(); err != nil {
return err
}
// STARTTLS MUST be the first feature to be negotiated
if err := d.negotiateSTARTTLS(c, conn); err != nil {
return err
}
if registered, err := d.negotiateInBandRegistration(c); err != nil || registered {
return err
}
// SASL negotiation. RFC 6120, section 6
if err := d.negotiateSASL(c); err != nil {
return err
}
//TODO: negotiate other features
return nil
}
func (d *dialer) bindTransport(c interfaces.Conn, conn net.Conn) {
c.SetInOut(makeInOut(conn, d.config))
c.SetRawOut(conn)
c.SetKeepaliveOut(&timeoutableConn{conn, keepaliveTimeout})
c.SetServerAddress(d.serverAddress)
}
func makeInOut(conn io.ReadWriter, config data.Config) (in *xml.Decoder, out io.Writer) {
if config.InLog != nil {
in = xml.NewDecoder(io.TeeReader(conn, config.InLog))
} else {
in = xml.NewDecoder(conn)
}
if config.OutLog != nil {
out = io.MultiWriter(conn, config.OutLog)
} else {
out = conn
}
return
}
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