127 lines
2.8 KiB
Go
127 lines
2.8 KiB
Go
package xmpp
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import (
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"bytes"
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"crypto/tls"
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"encoding/xml"
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"errors"
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"fmt"
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"log"
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"net"
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)
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const (
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nsStream = "http://etherx.jabber.org/streams"
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nsTLS = "urn:ietf:params:xml:ns:xmpp-tls"
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)
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type Stream struct {
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conn net.Conn
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dec *xml.Decoder
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}
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// Create a XML stream connection. A Steam is used by an XMPP instance to
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// handle sending and receiving XML data over the net connection.
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func NewStream(addr string) (*Stream, error) {
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log.Println("Connecting to", addr)
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conn, err := net.Dial("tcp", addr)
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if err != nil {
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return nil, err
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}
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if _, err := conn.Write([]byte("<?xml version='1.0'?>")); err != nil {
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return nil, err
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}
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dec := xml.NewDecoder(conn)
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return &Stream{conn, dec}, nil
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}
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// Upgrade the stream's underlying net conncetion to TLS.
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func (stream *Stream) UpgradeTLS(config *tls.Config) error {
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conn := tls.Client(stream.conn, config)
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if err := conn.Handshake(); err != nil {
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return err
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}
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stream.conn = conn
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stream.dec = xml.NewDecoder(stream.conn)
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return nil
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}
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// Send the element's start tag. Typically used to open the stream's document.
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func (stream *Stream) SendStart(start *xml.StartElement) error {
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buf := new(bytes.Buffer)
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if _, err := buf.Write([]byte{'<'}); err != nil {
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return err
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}
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if err := writeXMLName(buf, start.Name); err != nil {
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return err
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}
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for _, attr := range start.Attr {
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if _, err := buf.Write([]byte{' '}); err != nil {
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return err
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}
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if err := writeXMLAttr(buf, attr); err != nil {
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return err
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}
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}
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if _, err := buf.Write([]byte{'>'}); err != nil {
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return err
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}
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return stream.send(buf.Bytes())
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}
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// Send a stanza. Used to write a complete, top-level element.
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func (stream *Stream) Send(v interface{}) error {
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bytes, err := xml.Marshal(v)
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if err != nil {
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return err
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}
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return stream.send(bytes)
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}
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func (stream *Stream) send(b []byte) error {
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log.Println("send:", string(b))
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if _, err := stream.conn.Write(b); err != nil {
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return err
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}
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return nil
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}
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// Find start of next stanza. If match is not nil the stanza's XML name
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// compared and must be equal.
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func (stream *Stream) Next(match *xml.Name) (*xml.StartElement, error) {
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for {
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t, err := stream.dec.Token()
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if err != nil {
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return nil, err
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}
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if e, ok := t.(xml.StartElement); ok {
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if match != nil && e.Name != *match {
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return nil, errors.New(fmt.Sprintf("Expected %s, got %s", *match, e.Name))
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}
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return &e, nil
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}
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}
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panic("Unreachable")
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}
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// Decode the next stanza. Works like xml.Unmarshal but reads from the stream's
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// connection.
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func (stream *Stream) Decode(v interface{}) error {
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return stream.dec.Decode(v)
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}
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// Decode the stanza with the given start element. Works like
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// xml.Decoder.DecodeElement.
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func (stream *Stream) DecodeElement(v interface{}, start *xml.StartElement) error {
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return stream.dec.DecodeElement(v, start)
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}
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