From 7d6270f64b1dc00d91230b5c793bc49991f0fcf8 Mon Sep 17 00:00:00 2001
From: Andrew <saintruler@gmail.com>
Date: Wed, 28 Apr 2021 18:09:00 +0400
Subject: Added http client and tryAuth view to server.

---
 http-client/client.go | 106 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 106 insertions(+)
 create mode 100644 http-client/client.go

(limited to 'http-client/client.go')

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)
+	}
+}
-- 
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