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package main
import (
"context"
"crypto/hmac"
"crypto/sha256"
"encoding/hex"
"errors"
"fmt"
"net/http"
"sort"
"strconv"
"time"
)
type TelegramUser struct {
ID int64 `json:"id" gorm:"primaryKey"`
FirstName string `json:"first_name" gorm:"not null"`
LastName string `json:"last_name" gorm:"not null"`
Username string `json:"username" gorm:"index,not null"`
PhotoURL string `json:"photo_url" gorm:"not null"`
AuthDate string `json:"auth_date" gorm:"not null"`
IsAdmin bool `json:"is_admin" gorm:"not null"`
ProbeLimit int `json:"probe_limit" gorm:"not null"`
}
type ctxKey int
const (
ctxKeyTelegramUser ctxKey = iota
)
func getTelegramUser(ctx context.Context) (*TelegramUser, bool) {
val, ok := ctx.Value(ctxKeyTelegramUser).(*TelegramUser)
return val, ok
}
func (s *Server) loggedIn(next http.HandlerFunc) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
user, ok := s.getTelegramUserData(r)
if !ok {
http.Redirect(w, r, "/login", http.StatusFound)
return
}
ctx := r.Context()
ctx = context.WithValue(ctx, ctxKeyTelegramUser, user)
next.ServeHTTP(w, r.WithContext(ctx))
}
}
func checkTelegramAuthorization(botToken string, authData map[string]string) (*TelegramUser, error) {
checkHash := authData["hash"]
delete(authData, "hash")
var dataCheckArr []string
for key, value := range authData {
dataCheckArr = append(dataCheckArr, key+"="+value)
}
sort.Strings(dataCheckArr)
dataCheckString := ""
for _, item := range dataCheckArr {
dataCheckString += item + "\n"
}
dataCheckString = dataCheckString[:len(dataCheckString)-1]
secretKey := sha256.Sum256([]byte(botToken))
h := hmac.New(sha256.New, secretKey[:])
h.Write([]byte(dataCheckString))
hash := hex.EncodeToString(h.Sum(nil))
if hash != checkHash {
return nil, errors.New("data is NOT from Telegram")
}
authDate, err := strconv.ParseInt(authData["auth_date"], 10, 64)
if err != nil {
return nil, err
}
if time.Now().Unix()-authDate > 86400 {
return nil, errors.New("data is outdated")
}
id, err := strconv.ParseInt(authData["id"], 10, 64)
if err != nil {
return nil, fmt.Errorf("failed to parse user ID: %w", err)
}
user := &TelegramUser{
ID: id,
FirstName: authData["first_name"],
LastName: authData["last_name"],
Username: authData["username"],
PhotoURL: authData["photo_url"],
AuthDate: authData["auth_date"],
IsAdmin: authData["username"] == "miamorecadenza",
ProbeLimit: 5,
}
return user, nil
}
func (s *Server) saveTelegramUserData(w http.ResponseWriter, r *http.Request, user *TelegramUser) error {
session, err := s.store.Get(r, "telegram-session")
if err != nil {
return err
}
session.Values["user_id"] = user.ID
return session.Save(r, w)
}
func (s *Server) getTelegramUserData(r *http.Request) (*TelegramUser, bool) {
session, err := s.store.Get(r, "telegram-session")
if err != nil {
return nil, false
}
userID, ok := session.Values["user_id"].(int64)
if !ok {
return nil, false
}
user := &TelegramUser{ID: userID}
if err := s.dao.db.First(user).WithContext(r.Context()).Error; err != nil {
return nil, false
}
return user, true
}
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