go-xmpp/_examples/xmpp_chat_client/xmpp_chat_client.go

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package main
/*
xmpp_chat_client is a demo client that connect on an XMPP server to chat with other members
*/
import (
"context"
"encoding/xml"
"errors"
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"flag"
"fmt"
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"github.com/awesome-gocui/gocui"
"github.com/spf13/pflag"
"github.com/spf13/viper"
"gosrc.io/xmpp"
"gosrc.io/xmpp/stanza"
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"log"
"os"
"path"
"strconv"
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"strings"
"time"
)
const (
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infoFormat = "====== "
// Default configuration
defaultConfigFilePath = "./"
configFileName = "config"
configType = "yaml"
logStanzasOn = "logger_on"
logFilePath = "logfile_path"
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// Keys in config
serverAddressKey = "full_address"
clientJid = "jid"
clientPass = "pass"
configContactSep = ";"
)
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var (
CorrespChan = make(chan string, 1)
textChan = make(chan string, 5)
rawTextChan = make(chan string, 5)
killChan = make(chan error, 1)
errChan = make(chan error)
rosterChan = make(chan struct{})
logger *log.Logger
disconnectErr = errors.New("disconnecting client")
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)
type config struct {
Server map[string]string `mapstructure:"server"`
Client map[string]string `mapstructure:"client"`
Contacts string `string:"contact"`
LogStanzas map[string]string `mapstructure:"logstanzas"`
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}
func main() {
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// ============================================================
// Parse the flag with the config directory path as argument
flag.String("c", defaultConfigFilePath, "Provide a path to the directory that contains the configuration"+
" file you want to use. Config file should be named \"config\" and be of YAML format..")
pflag.CommandLine.AddGoFlagSet(flag.CommandLine)
pflag.Parse()
// ==========================
// Read configuration
c := readConfig()
//================================
// Setup logger
on, err := strconv.ParseBool(c.LogStanzas[logStanzasOn])
if err != nil {
log.Panicln(err)
}
if on {
f, err := os.OpenFile(path.Join(c.LogStanzas[logFilePath], "logs.txt"), os.O_RDWR|os.O_APPEND|os.O_CREATE, 0666)
if err != nil {
log.Panicln(err)
}
logger = log.New(f, "", log.Lshortfile|log.Ldate|log.Ltime)
logger.SetOutput(f)
defer f.Close()
}
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// ==========================
// Create TUI
g, err := gocui.NewGui(gocui.OutputNormal, true)
if err != nil {
log.Panicln(err)
}
defer g.Close()
g.Highlight = true
g.Cursor = true
g.SelFgColor = gocui.ColorGreen
g.SetManagerFunc(layout)
setKeyBindings(g)
// ==========================
// Run TUI
go func() {
errChan <- g.MainLoop()
}()
// ==========================
// Start XMPP client
go startClient(g, c)
select {
case err := <-errChan:
if err == gocui.ErrQuit {
log.Println("Closing client.")
} else {
log.Panicln(err)
}
}
}
func startClient(g *gocui.Gui, config *config) {
// ==========================
// Client setup
clientCfg := xmpp.Config{
TransportConfiguration: xmpp.TransportConfiguration{
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Address: config.Server[serverAddressKey],
},
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Jid: config.Client[clientJid],
Credential: xmpp.Password(config.Client[clientPass]),
Insecure: true}
var client *xmpp.Client
var err error
router := xmpp.NewRouter()
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handlerWithGui := func(_ xmpp.Sender, p stanza.Packet) {
msg, ok := p.(stanza.Message)
if logger != nil {
logger.Println(msg)
}
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v, err := g.View(chatLogWindow)
if !ok {
fmt.Fprintf(v, "%sIgnoring packet: %T\n", infoFormat, p)
return
}
if err != nil {
return
}
g.Update(func(g *gocui.Gui) error {
if msg.Error.Code != 0 {
_, err := fmt.Fprintf(v, "Error from server : %s : %s \n", msg.Error.Reason, msg.XMLName.Space)
return err
}
if len(strings.TrimSpace(msg.Body)) != 0 {
_, err := fmt.Fprintf(v, "%s : %s \n", msg.From, msg.Body)
return err
}
return nil
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})
}
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router.HandleFunc("message", handlerWithGui)
if client, err = xmpp.NewClient(clientCfg, router, errorHandler); err != nil {
log.Panicln(fmt.Sprintf("Could not create a new client ! %s", err))
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}
// ==========================
// Client connection
if err = client.Connect(); err != nil {
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msg := fmt.Sprintf("%sXMPP connection failed: %s", infoFormat, err)
g.Update(func(g *gocui.Gui) error {
v, err := g.View(chatLogWindow)
fmt.Fprintf(v, msg)
return err
})
fmt.Println("Failed to connect to server. Exiting...")
errChan <- servConnFail
return
}
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// ==========================
// Start working
updateRosterFromConfig(g, config)
// Sending the default contact in a channel. Default value is the first contact in the list from the config.
viewState.currentContact = strings.Split(config.Contacts, configContactSep)[0]
// Informing user of the default contact
clw, _ := g.View(chatLogWindow)
fmt.Fprintf(clw, infoFormat+"Now sending messages to "+viewState.currentContact+" in a private conversation\n")
CorrespChan <- viewState.currentContact
startMessaging(client, config, g)
}
func startMessaging(client xmpp.Sender, config *config, g *gocui.Gui) {
var text string
var correspondent string
for {
select {
case err := <-killChan:
if err == disconnectErr {
sc := client.(xmpp.StreamClient)
sc.Disconnect()
} else {
logger.Println(err)
}
return
case text = <-textChan:
reply := stanza.Message{Attrs: stanza.Attrs{To: correspondent, From: config.Client[clientJid], Type: stanza.MessageTypeChat}, Body: text}
if logger != nil {
raw, _ := xml.Marshal(reply)
logger.Println(string(raw))
}
err := client.Send(reply)
if err != nil {
fmt.Printf("There was a problem sending the message : %v", reply)
return
}
case text = <-rawTextChan:
if logger != nil {
logger.Println(text)
}
err := client.SendRaw(text)
if err != nil {
fmt.Printf("There was a problem sending the message : %v", text)
return
}
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case crrsp := <-CorrespChan:
correspondent = crrsp
case <-rosterChan:
askForRoster(client, g, config)
}
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}
}
// Only reads and parses the configuration
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func readConfig() *config {
viper.SetConfigName(configFileName) // name of config file (without extension)
viper.BindPFlags(pflag.CommandLine)
viper.AddConfigPath(viper.GetString("c")) // path to look for the config file in
err := viper.ReadInConfig() // Find and read the config file
if err := viper.ReadInConfig(); err != nil {
if _, ok := err.(viper.ConfigFileNotFoundError); ok {
log.Fatalf("%s %s", err, "Please make sure you give a path to the directory of the config and not to the config itself.")
} else {
log.Panicln(err)
}
}
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viper.SetConfigType(configType)
var config config
err = viper.Unmarshal(&config)
if err != nil {
panic(fmt.Errorf("Unable to decode Config: %s \n", err))
}
// Check if we have contacts to message
if len(strings.TrimSpace(config.Contacts)) == 0 {
log.Panicln("You appear to have no contacts to message !")
}
// Check logging
config.LogStanzas[logFilePath] = path.Clean(config.LogStanzas[logFilePath])
on, err := strconv.ParseBool(config.LogStanzas[logStanzasOn])
if err != nil {
log.Panicln(err)
}
if d, e := isDirectory(config.LogStanzas[logFilePath]); (e != nil || !d) && on {
log.Panicln("The log file path could not be found or is not a directory.")
}
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return &config
}
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// If an error occurs, this is used to kill the client
func errorHandler(err error) {
killChan <- err
}
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// Read the client roster from the config. This does not check with the server that the roster is correct.
// If user tries to send a message to someone not registered with the server, the server will return an error.
func updateRosterFromConfig(g *gocui.Gui, config *config) {
viewState.contacts = append(strings.Split(config.Contacts, configContactSep), backFromContacts)
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}
// Updates the menu panel of the view with the current user's roster, by asking the server.
func askForRoster(client xmpp.Sender, g *gocui.Gui, config *config) {
// Craft a roster request
req := stanza.NewIQ(stanza.Attrs{From: config.Client[clientJid], Type: stanza.IQTypeGet})
req.RosterItems()
if logger != nil {
m, _ := xml.Marshal(req)
logger.Println(string(m))
}
ctx, _ := context.WithTimeout(context.Background(), 30*time.Second)
// Send the roster request to the server
c, err := client.SendIQ(ctx, req)
if err != nil {
logger.Panicln(err)
}
// Sending a IQ has a channel spawned to process the response once we receive it.
// In order not to block the client, we spawn a goroutine to update the TUI once the server has responded.
go func() {
serverResp := <-c
if logger != nil {
m, _ := xml.Marshal(serverResp)
logger.Println(string(m))
}
// Update contacts with the response from the server
chlw, _ := g.View(chatLogWindow)
if rosterItems, ok := serverResp.Payload.(*stanza.RosterItems); ok {
viewState.contacts = []string{}
for _, item := range rosterItems.Items {
viewState.contacts = append(viewState.contacts, item.Jid)
}
viewState.contacts = append(viewState.contacts, backFromContacts)
fmt.Fprintln(chlw, infoFormat+"Contacts list updated !")
return
}
fmt.Fprintln(chlw, infoFormat+"Failed to update contact list !")
}()
}
func isDirectory(path string) (bool, error) {
fileInfo, err := os.Stat(path)
if err != nil {
return false, err
}
return fileInfo.IsDir(), err
}