140 lines
3.6 KiB
Go
140 lines
3.6 KiB
Go
package xmpp // import "fluux.io/xmpp"
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import (
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"bytes"
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"encoding/xml"
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"errors"
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"fmt"
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"net"
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"strings"
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"time"
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)
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// Client is the main structure use to connect as a client on an XMPP
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// server.
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type Client struct {
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// Store user defined options
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options Options
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// Session gather data that can be accessed by users of this library
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Session *Session
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// TCP level connection / can be replaced by a TLS session after starttls
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conn net.Conn
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}
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/*
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Setting up the client / Checking the parameters
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*/
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// NewClient generates a new XMPP client, based on Options passed as parameters.
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// If host is not specified, the DNS SRV should be used to find the host from the domainpart of the JID.
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// Default the port to 5222.
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// TODO: better options checks
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func NewClient(options Options) (c *Client, err error) {
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// TODO: If option address is nil, use the Jid domain to compose the address
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if options.Address, err = checkAddress(options.Address); err != nil {
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return
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}
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if options.Password == "" {
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err = errors.New("missing password")
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return
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}
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c = new(Client)
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c.options = options
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// Parse JID
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if c.options.parsedJid, err = NewJid(c.options.Jid); err != nil {
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return
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}
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if c.options.ConnectTimeout == 0 {
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c.options.ConnectTimeout = 15 // 15 second as default
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}
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return
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}
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// TODO Pass JID to be able to add default address based on JID, if
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// addr is empty
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func checkAddress(addr string) (string, error) {
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var err error
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hostport := strings.Split(addr, ":")
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if len(hostport) > 2 {
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err = errors.New("too many colons in xmpp server address")
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return addr, err
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}
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// Address is composed of two parts, we are good
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if len(hostport) == 2 && hostport[1] != "" {
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return addr, err
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}
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// Port was not passed, we append XMPP default port:
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return strings.Join([]string{hostport[0], "5222"}, ":"), err
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}
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// Connect triggers actual TCP connection, based on previously defined parameters.
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func (c *Client) Connect() (*Session, error) {
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var tcpconn net.Conn
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var err error
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// TODO: Refactor = abstract retry loop in capped exponential back-off function
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var try = 0
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var success bool
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for try <= c.options.Retry || !success {
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if tcpconn, err = net.DialTimeout("tcp", c.options.Address, time.Duration(c.options.ConnectTimeout)*time.Second); err == nil {
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success = true
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}
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try++
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}
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if err != nil {
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return nil, err
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}
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// Connection is ok, we now open XMPP session
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c.conn = tcpconn
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if c.conn, c.Session, err = NewSession(c.conn, c.options); err != nil {
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return c.Session, err
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}
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// We're connected and can now receive and send messages.
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//fmt.Fprintf(client.conn, "<presence xml:lang='en'><show>%s</show><status>%s</status></presence>", "chat", "Online")
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// TODO: Do we always want to send initial presence automatically ?
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// Do we need an option to avoid that or do we rely on client to send the presence itself ?
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fmt.Fprintf(c.Session.socketProxy, "<presence/>")
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return c.Session, err
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}
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func (c *Client) recv(receiver chan<- interface{}) (err error) {
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for {
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val, err := next(c.Session.decoder)
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if err != nil {
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return err
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}
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receiver <- val
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val = nil
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}
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panic("unreachable")
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}
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// Recv abstracts receiving preparsed XMPP packets from a channel.
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// Channel allow client to receive / dispatch packets in for range loop.
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func (c *Client) Recv() <-chan interface{} {
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ch := make(chan interface{})
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go c.recv(ch)
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return ch
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}
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// Send sends message text.
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func (c *Client) Send(packet string) error {
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fmt.Fprintf(c.Session.socketProxy, packet) // TODO handle errors
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return nil
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}
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func xmlEscape(s string) string {
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var b bytes.Buffer
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xml.Escape(&b, []byte(s))
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return b.String()
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}
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