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package main
import (
"bytes"
"encoding/base64"
"encoding/json"
"errors"
"fmt"
"fyne.io/fyne/v2/data/binding"
"io"
"net/http"
"strings"
"sync"
"time"
)
const (
Register = "/api/register"
SendMessage = "/api/sendMessage"
PollMessages = "/api/pollMessages"
GetUserKey = "/api/getUserKey"
TryAuth = "/api/tryAuth"
)
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
Payload string
Signature string
}
func (msg *Message) toString() string {
return fmt.Sprintf("%s: %s", msg.User, msg.Data)
}
func makeRequest(request Request, apiMethod string, user UserData) (*http.Response, error) {
signedRequest, err := signRequest(request, user.ParsedUserKey)
if err != nil {
return nil, err
}
reader := bytes.NewReader([]byte(signedRequest))
return http.Post(user.ServerUrl+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, user)
}
func register(user UserData, serverKey string) (Response, error) {
var resp Response
httpResp, err := makeRequest(Request{
User: user.Username,
Data: serverKey,
}, Register, user)
if err != nil {
return resp, err
}
body, _ := io.ReadAll(httpResp.Body)
_ = json.Unmarshal(body, &resp)
if httpResp.StatusCode == http.StatusOK {
return resp, nil
} else {
return resp, errors.New(resp.Message)
}
}
func tryAuth(user UserData) (bool, error) {
var resp Response
httpResp, err := makeRequest(Request{
User: user.Username,
Data: "auth",
}, TryAuth, user)
if err != nil {
return false, err
}
body, _ := io.ReadAll(httpResp.Body)
_ = json.Unmarshal(body, &resp)
if httpResp.StatusCode == http.StatusOK {
return true, nil
} else {
return false, errors.New(resp.Message)
}
}
func pingServer(user UserData) error {
_, err := http.Get(user.ServerUrl)
return err
}
func parseMessage(signedMessage string) (Message, error) {
var msg Message
parts := strings.Split(signedMessage, ".")
if len(parts) != 2 {
return msg, errors.New("request doesn't contain exactly two parts")
}
payload := parts[0]
signature := parts[1]
messageBody, err := base64.StdEncoding.DecodeString(payload)
if err != nil {
return msg, err
}
err = json.Unmarshal(messageBody, &msg)
if err != nil {
return msg, errors.New("unable to parse message")
}
msg.Payload = payload
msg.Signature = signature
return msg, nil
}
// TODO(andrew): Заменить сбор новых сообщений через http запрос к серверу на
// получения обновлений через сокет от сервера.
func runClient(user UserData) {
var lastPoll int64 = 0
for {
httpResp, _ := makeRequest(Request{
User: user.Username,
Data: fmt.Sprint(lastPoll),
}, PollMessages, user)
lastPoll = time.Now().UnixNano()
if httpResp.StatusCode == http.StatusOK {
body, _ := io.ReadAll(httpResp.Body)
var resp Response
_ = json.Unmarshal(body, &resp)
var signedMessages []string
_ = json.Unmarshal([]byte(resp.Message), &signedMessages)
storage.Lock()
for _, signedMessage := range signedMessages {
msg, _ := parseMessage(signedMessage)
fmt.Printf("Polled new message from %s: %s\n", msg.User, msg.Data)
_ = 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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