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package main
import (
"context"
"flag"
"fmt"
"net"
"net/http"
"os"
"strconv"
"time"
tgbotapi "github.com/go-telegram-bot-api/telegram-bot-api"
"github.com/rs/zerolog/log"
pb "github.com/terminaldweller/grpc/telebot/v1"
"golang.org/x/net/proxy"
"google.golang.org/grpc"
)
// FIXME-the client should provide the channel ID.
var botChannelID = flag.Int64(
"botchannelid",
146328407, //nolint: gomnd
"determines the channel id the telgram bot should send messages to")
const (
telegramBotTokenEnvVar = "TELEGRAM_BOT_TOKEN" //nolint: gosec
httpClientTimeout = 5
)
type server struct {
pb.UnimplementedNotificationServiceServer
}
func GetProxiedClient() (*http.Client, error) {
var isProxied bool
proxyURL := os.Getenv("ALL_PROXY")
if proxyURL == "" {
proxyURL = os.Getenv("HTTPS_PROXY")
}
if proxyURL == "" {
isProxied = false
}
var dialer_proxy proxy.Dialer
var dialer net.Dialer
var err error
if isProxied {
dialer_proxy, err = proxy.SOCKS5("tcp", proxyURL, nil, proxy.Direct)
if err != nil {
return nil, fmt.Errorf("[GetProxiedClient] : %w", err)
}
} else {
dialer = net.Dialer{
Timeout: 5 * time.Second,
}
if err != nil {
return nil, fmt.Errorf("[GetProxiedClient] : %w", err)
}
}
dialContext := func(ctx context.Context, network, address string) (net.Conn, error) {
if isProxied {
netConn, err := dialer_proxy.Dial(network, address)
if err == nil {
return netConn, nil
}
return netConn, fmt.Errorf("[dialContext] : %w", err)
} else {
netConn, err := dialer.Dial(network, address)
if err == nil {
return netConn, nil
}
return netConn, fmt.Errorf("[dialContext] : %w", err)
}
}
transport := &http.Transport{
DialContext: dialContext,
DisableKeepAlives: true,
}
client := &http.Client{
Transport: transport,
Timeout: httpClientTimeout * time.Second,
CheckRedirect: nil,
Jar: nil,
}
return client, nil
}
func getTGBot() *tgbotapi.BotAPI {
token := os.Getenv(telegramBotTokenEnvVar)
// client, err := GetProxiedClient()
// if err != nil {
// log.Fatal().Err(err)
// }
// bot, err := tgbotapi.NewBotAPIWithClient(token[1:len(token)-1], client)
bot, err := tgbotapi.NewBotAPI(token[1 : len(token)-1])
if err != nil {
log.Fatal().Err(err)
}
return bot
}
func sendMessage(bot *tgbotapi.BotAPI, msgText string, channelID int64) error {
msg := tgbotapi.NewMessage(channelID, msgText)
_, err := bot.Send(msg)
return err
}
func (s *server) Notify(
ctx context.Context,
NotificationRequest *pb.NotificationRequest,
) (*pb.NotificationResponse, error) {
var err error
tgbotapi := getTGBot()
if NotificationRequest.ChannelId == 0 {
err = sendMessage(tgbotapi, NotificationRequest.NotificationText, *botChannelID)
} else {
err = sendMessage(tgbotapi, NotificationRequest.NotificationText, NotificationRequest.ChannelId)
}
if err != nil {
return &pb.NotificationResponse{Error: err.Error(), IsOK: false}, err
}
return &pb.NotificationResponse{Error: "", IsOK: true}, nil
}
func startServer(port uint16) {
listener, err := net.Listen("tcp", fmt.Sprintf("0.0.0.0:%d", port))
if err != nil {
log.Fatal().Err(err)
}
var opts []grpc.ServerOption
grpcServer := grpc.NewServer(opts...)
pb.RegisterNotificationServiceServer(grpcServer, &server{})
if err := grpcServer.Serve(listener); err != nil {
log.Fatal().Err(err)
}
}
func main() {
flagPort := flag.String("port", "8000", "determines the port the service runs on")
flag.Parse()
port, _ := strconv.Atoi(*flagPort)
startServer(uint16(port))
}
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