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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)
}
}
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