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package main
import (
"crypto/rsa"
"fmt"
"fyne.io/fyne/v2"
"fyne.io/fyne/v2/app"
"fyne.io/fyne/v2/canvas"
"fyne.io/fyne/v2/container"
"fyne.io/fyne/v2/data/binding"
"fyne.io/fyne/v2/dialog"
"fyne.io/fyne/v2/layout"
"fyne.io/fyne/v2/theme"
"fyne.io/fyne/v2/widget"
"image/color"
"regexp"
"strings"
)
type UserData struct {
ServerUrl string
Username string
ServerKey []byte
UserKey []byte
ParsedUserKey *rsa.PublicKey
}
const DefaultPort = "12345"
func parseServerUrl(url string) (string, error) {
url = strings.TrimRight(url, "/")
urlFormat, err := regexp.Compile("(.*://)?((.*):(\\d+)|(.*))")
if err != nil {
return "", err
}
matches := urlFormat.FindStringSubmatch(url)
host := ""
port := ""
if matches[5] != "" {
host = matches[5]
port = DefaultPort
} else {
host = matches[3]
port = matches[4]
}
addr := fmt.Sprintf("http://%s:%s", host, port)
return addr, nil
}
func chatLayout(window fyne.Window, user UserData) {
window.SetTitle("Сообщения")
storage.binding = binding.BindStringList(&storage.data)
go runClient(user)
list := widget.NewListWithData(storage.binding,
func() fyne.CanvasObject {
return widget.NewLabel("template")
},
func(i binding.DataItem, o fyne.CanvasObject) {
o.(*widget.Label).Bind(i.(binding.String))
})
entry := widget.NewEntry()
submit := widget.NewButton("Отправить", func() {
go sendMessage(user, entry.Text)
entry.SetText("")
storage.RLock()
lastIdx := storage.binding.Length() - 1
list.Select(lastIdx)
list.Unselect(lastIdx)
storage.RUnlock()
})
window.SetContent(container.NewBorder(
nil,
container.NewBorder(nil, nil, nil, submit, entry),
nil, nil,
list,
))
}
func loginLayout(window fyne.Window, user UserData) {
window.SetTitle("Войти в чат")
keyIsSetup := false
label := canvas.NewText("Chat", color.White)
label.TextSize = 40
urlLabel := widget.NewLabel("URL: ")
urlEntry := widget.NewEntry()
urlEntry.Text = "localhost"
loginLabel := widget.NewLabel("Логин: ")
loginEntry := widget.NewEntry()
chooseKey := widget.NewButton("Выбрать ключ для подписи", func() {
dialog.ShowFileOpen(func(closer fyne.URIReadCloser, err error) {
if closer == nil {
return
}
bufSize := 4096
data := make([]byte, 0)
buf := make([]byte, bufSize)
n := bufSize
for n >= bufSize {
n, _ = closer.Read(buf)
data = append(data, buf...)
}
user.ParsedUserKey, err = parseKey(data)
if err != nil {
dialog.ShowInformation("Ошибка", "Выбранный файл не является ключом", window)
return
}
user.UserKey = data
user.ServerKey = nil
keyIsSetup = true
_ = closer.Close()
}, window)
})
loginButton := widget.NewButton("Войти", func() {
if !keyIsSetup {
dialog.ShowInformation("Ошибка", "Не выбран ключ", window)
return
}
if len(loginEntry.Text) == 0 {
dialog.ShowInformation("Ошибка", "Логин не может быть пустым", window)
return
}
user.Username = loginEntry.Text
if len(urlEntry.Text) == 0 {
dialog.ShowInformation("Ошибка", "URL не может быть пустым", window)
return
}
url, err := parseServerUrl(urlEntry.Text)
if err != nil {
dialog.ShowInformation("Ошибка", err.Error(), window)
}
user.ServerUrl = url
err = pingServer(user)
if err != nil {
dialog.ShowInformation("Ошибка", "Нет связи с указанным сервером", window)
return
}
_, err = tryAuth(user)
if err != nil {
dialog.ShowInformation("Ошибка", fmt.Sprint(err), window)
return
}
chatLayout(window, user)
})
back := widget.NewButton("Назад", func() {
startLayout(window, user)
})
mainContainer := container.NewCenter(container.NewVBox(
container.NewCenter(label), layout.NewSpacer(),
container.NewBorder(nil, nil, urlLabel, nil, urlEntry),
container.NewBorder(nil, nil, loginLabel, nil, loginEntry),
chooseKey,
loginButton,
back,
))
window.SetContent(mainContainer)
}
func registerLayout(window fyne.Window, user UserData) {
window.SetTitle("Регистрация")
keyIsSetup := false
label := canvas.NewText("Chat", color.White)
label.TextSize = 40
urlLabel := widget.NewLabel("URL: ")
urlEntry := widget.NewEntry()
urlEntry.Text = "localhost"
loginLabel := widget.NewLabel("Логин: ")
loginEntry := widget.NewEntry()
generateKeysBtn := widget.NewButton("Сгенерировать ключи подписи", func() {
dialog.ShowFileSave(func(closer fyne.URIWriteCloser, err error) {
if closer == nil {
return
}
private, public, err := generateKeys()
if err != nil {
dialog.ShowInformation("Ошибка", fmt.Sprint(err), window)
return
}
user.ServerKey = private
user.UserKey = public
user.ParsedUserKey, _ = parseKey(user.UserKey)
keyIsSetup = true
_, _ = closer.Write(user.UserKey)
_ = closer.Close()
}, window)
})
registerButton := widget.NewButton("Зарегистрироваться", func() {
if !keyIsSetup {
dialog.ShowInformation("Ошибка", "Не выбран ключ", window)
return
}
if len(loginEntry.Text) == 0 {
dialog.ShowInformation("Ошибка", "Логин не может быть пустым", window)
return
}
user.Username = loginEntry.Text
if len(urlEntry.Text) == 0 {
dialog.ShowInformation("Ошибка", "URL не может быть пустым", window)
return
}
url, err := parseServerUrl(urlEntry.Text)
if err != nil {
dialog.ShowInformation("Ошибка", err.Error(), window)
}
user.ServerUrl = url
err = pingServer(user)
if err != nil {
dialog.ShowInformation("Ошибка", "Нет связи с указанным сервером", window)
return
}
_, err = register(user, string(user.ServerKey))
if err != nil {
dialog.ShowInformation("Ошибка", fmt.Sprint(err), window)
return
}
chatLayout(window, user)
})
back := widget.NewButton("Назад", func() {
startLayout(window, user)
})
window.SetContent(container.NewCenter(container.NewVBox(
container.NewCenter(label), layout.NewSpacer(),
container.NewBorder(nil, nil, urlLabel, nil, urlEntry),
container.NewBorder(nil, nil, loginLabel, nil, loginEntry),
generateKeysBtn,
registerButton,
back,
)))
}
func startLayout(window fyne.Window, user UserData) {
window.SetTitle("Chat")
label := canvas.NewText("Chat", color.White)
label.TextSize = 40
login := widget.NewButton("Войти", func() {
loginLayout(window, user)
})
signup := widget.NewButton("Зарегистрироваться", func() {
registerLayout(window, user)
})
mainContainer := container.NewCenter(container.NewVBox(
container.NewCenter(label), layout.NewSpacer(), login, signup))
window.SetContent(mainContainer)
}
func main() {
myApp := app.New()
myApp.Settings().SetTheme(theme.DarkTheme())
window := myApp.NewWindow("")
window.Resize(fyne.Size{Width: 640, Height: 480})
var user UserData
startLayout(window, user)
window.ShowAndRun()
}
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