3 files changed, 266 insertions, 0 deletions
diff --git a/http-client/client.go b/http-client/client.go
new file mode 100644
index 0000000..ee3e044
--- /dev/null
+++ b/http-client/client.go
@@ -0,0 +1,106 @@
+package main
+
+import (
+	"bytes"
+	"crypto/sha256"
+	"encoding/base64"
+	"encoding/json"
+	"fmt"
+	"fyne.io/fyne/v2/data/binding"
+	"io"
+	"net/http"
+	"sync"
+	"time"
+)
+
+const (
+	URL          = "http://localhost:8080/api"
+	Register     = "register"
+	SendMessage  = "sendMessage"
+	PollMessages = "pollMessages"
+	GetUserKey   = "getUserKey"
+	TryAuth      = "tryAuth"
+)
+
+const TimestampFormat = "2006-01-02T15-01-05.999"
+
+var storage struct {
+	sync.RWMutex
+	messages []Message
+	data     []string
+	binding  binding.ExternalStringList
+}
+
+type Request struct {
+	User string
+	Data string
+}
+
+type Response struct {
+	Message string
+}
+
+type Message struct {
+	User      string
+	Data      string
+	Timestamp string
+}
+
+func (msg *Message) toString() string {
+	return fmt.Sprintf("%s: %s", msg.User, msg.Data)
+}
+
+func signData(data []byte) string {
+	data64 := base64.StdEncoding.EncodeToString(data)
+	h := sha256.Sum256([]byte(data64))
+	signature := fmt.Sprintf("%x", h)
+	return fmt.Sprintf("%s.%s", data64, signature)
+}
+
+func makeRequest(request Request, apiMethod string) (*http.Response, error) {
+	req, _ := json.Marshal(request)
+	signedRequest := signData(req)
+	reader := bytes.NewReader([]byte(signedRequest))
+	return http.Post(URL+"/"+apiMethod, "application/json", reader)
+}
+
+func sendMessage(user UserData, message string) {
+	// TODO(andrew): Добавить отображение ошибки в интерфейс
+	_, _ = makeRequest(Request{
+		User: user.Username,
+		Data: message,
+	}, SendMessage)
+}
+
+func runClient(user UserData) {
+	lastPoll := time.Now().UnixNano()
+	for {
+		httpResp, _ := makeRequest(Request{
+			User: user.Username,
+			Data: fmt.Sprint(lastPoll),
+		}, PollMessages)
+		lastPoll = time.Now().UnixNano()
+
+		if httpResp.StatusCode == http.StatusOK {
+			body, _ := io.ReadAll(httpResp.Body)
+			var resp Response
+			_ = json.Unmarshal(body, &resp)
+			var messages []Message
+			_ = json.Unmarshal([]byte(resp.Message), &messages)
+
+			storage.Lock()
+			for _, msg := range messages {
+				fmt.Printf("Polled new message from %s: %s (%s)\n", msg.User, msg.Data, msg.Timestamp)
+				_ = storage.binding.Append(msg.toString())
+				storage.messages = append(storage.messages, msg)
+			}
+			storage.Unlock()
+		} else {
+			fmt.Println(httpResp.StatusCode)
+			ae, _ := io.ReadAll(httpResp.Body)
+			fmt.Println(string(ae))
+		}
+
+		time.Sleep(100 * time.Millisecond)
+	}
+}
diff --git a/http-client/go.mod b/http-client/go.mod
new file mode 100644
index 0000000..a62b9f0
--- /dev/null
+++ b/http-client/go.mod
@@ -0,0 +1,5 @@
+module vasthecat.ru/coursework/http-client
+
+go 1.16
+
+require fyne.io/fyne/v2 v2.0.2
diff --git a/http-client/main.go b/http-client/main.go
new file mode 100644
index 0000000..14419e5
--- /dev/null
+++ b/http-client/main.go
@@ -0,0 +1,155 @@
+package main
+
+import (
+	"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/widget"
+	"image/color"
+)
+
+type UserData struct {
+	Username string
+}
+
+func chatLayout(window fyne.Window, user UserData, c chan string) {
+	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, c chan string) {
+	window.SetTitle("Войти в чат")
+
+	label := canvas.NewText("Chat", color.White)
+	label.TextSize = 40
+
+	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...)
+			}
+
+			_ = closer.Close()
+		}, window)
+	})
+
+	loginButton := widget.NewButton("Войти", func() {
+		var user = UserData{
+			Username: loginEntry.Text,
+		}
+		chatLayout(window, user, c)
+	})
+
+	back := widget.NewButton("Назад", func() {
+		startLayout(window, c)
+	})
+
+	mainContainer := container.NewCenter(container.NewVBox(
+		container.NewCenter(label), layout.NewSpacer(),
+		container.NewBorder(nil, nil, loginLabel, nil, loginEntry),
+		chooseKey,
+		loginButton,
+		back,
+	))
+	window.SetContent(mainContainer)
+}
+
+func registerLayout(window fyne.Window, c chan string) {
+	window.SetTitle("Регистрация")
+
+	label := canvas.NewText("Chat", color.White)
+	label.TextSize = 40
+
+	loginLabel := widget.NewLabel("Логин: ")
+	loginEntry := widget.NewEntry()
+
+	generateKeys := widget.NewButton("Сгенерировать ключи подписи", func() {
+
+	})
+
+	registerButton := widget.NewButton("Зарегистрироваться", func() {
+
+	})
+
+	back := widget.NewButton("Назад", func() {
+		startLayout(window, c)
+	})
+
+	window.SetContent(container.NewCenter(container.NewVBox(
+		container.NewCenter(label), layout.NewSpacer(),
+		container.NewBorder(nil, nil, loginLabel, nil, loginEntry),
+		generateKeys,
+		registerButton,
+		back,
+	)))
+}
+
+func startLayout(window fyne.Window, c chan string) {
+	window.SetTitle("Chat")
+
+	label := canvas.NewText("Chat", color.White)
+	label.TextSize = 40
+	login := widget.NewButton("Войти", func() {
+		loginLayout(window, c)
+	})
+	signup := widget.NewButton("Зарегистрироваться", func() {
+		registerLayout(window, c)
+	})
+
+	mainContainer := container.NewCenter(container.NewVBox(
+		container.NewCenter(label), layout.NewSpacer(), login, signup))
+	window.SetContent(mainContainer)
+}
+
+func main() {
+	myApp := app.New()
+	window := myApp.NewWindow("")
+	channel := make(chan string)
+
+	startLayout(window, channel)
+	window.ShowAndRun()
+}