feat: initial implementation of uptodownbot

Telegram bot for downloading media from any site using yt-dlp.
Supports audio/video/both, quality selection, language picker,
container format selection, playlist pagination, progress updates,
per-user quotas, user preferences, download history, cancel at any step,
polling and webhook modes, proxy support, and SQLite persistence.

cmd/bot/main.go

@@ -0,0 +1,124 @@
+package main
+
+import (
+	"context"
+	"log/slog"
+	"os"
+	"os/signal"
+	"strconv"
+	"strings"
+	"syscall"
+
+	tgbot "github.com/go-telegram/bot"
+	"github.com/go-telegram/bot/models"
+	"github.com/joho/godotenv"
+
+	"uptodownBot/internal/dl"
+	"uptodownBot/internal/handler"
+	"uptodownBot/internal/repo"
+)
+
+func main() {
+	slog.SetDefault(slog.New(slog.NewTextHandler(os.Stderr, &slog.HandlerOptions{
+		AddSource: true,
+		Level:     slog.LevelInfo,
+	})))
+
+	godotenv.Load()
+
+	token := os.Getenv("BOT_TOKEN")
+	dbPath := getEnvDefault("DB_PATH", "data/uptodown.db")
+	downloadDir := getEnvDefault("DOWNLOAD_DIR", "/tmp/uptodown")
+	maxFileSizeMB := getEnvIntDefault("MAX_FILE_SIZE_MB", 2000)
+	cookiesFile := os.Getenv("COOKIES_FILE")
+
+	if token == "" {
+		slog.Error("BOT_TOKEN is required")
+		os.Exit(1)
+	}
+
+	store, err := repo.NewStore(dbPath)
+	if err != nil {
+		slog.Error("failed to open database", "path", dbPath, "error", err)
+		os.Exit(1)
+	}
+
+	ytdlp, err := dl.NewClient(cookiesFile)
+	if err != nil {
+		slog.Error("failed to init yt-dlp", "error", err)
+		os.Exit(1)
+	}
+
+	allowedUsers := parseAllowedUsers(os.Getenv("BOT_ALLOWED_USERS"))
+
+	var h *handler.Handler
+
+	dispatch := func(ctx context.Context, b *tgbot.Bot, update *models.Update) {
+		if update.Message != nil {
+			h.HandleMessage(ctx, update.Message)
+		}
+		if update.CallbackQuery != nil {
+			h.HandleCallback(ctx, update.CallbackQuery)
+		}
+	}
+
+	b, err := tgbot.New(token, tgbot.WithDefaultHandler(dispatch))
+	if err != nil {
+		slog.Error("failed to create bot", "error", err)
+		os.Exit(1)
+	}
+
+	h = handler.NewHandler(b, store, ytdlp, allowedUsers, downloadDir, int64(maxFileSizeMB)*1024*1024)
+
+	ctx, cancel := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
+	defer cancel()
+
+	if url := os.Getenv("BOT_WEBHOOK_URL"); url != "" {
+		startWebhook(ctx, b, h, url)
+	} else {
+		if _, err := b.DeleteWebhook(ctx, &tgbot.DeleteWebhookParams{}); err != nil {
+			slog.Warn("failed to delete webhook", "error", err)
+		}
+		slog.Info("bot started",
+			"allowed_users", len(allowedUsers),
+			"mode", "polling",
+		)
+		b.Start(ctx)
+	}
+
+	store.Close()
+}
+
+func parseAllowedUsers(raw string) map[int64]bool {
+	m := make(map[int64]bool)
+	for _, s := range strings.Split(raw, ",") {
+		s = strings.TrimSpace(s)
+		if s == "" {
+			continue
+		}
+		id, err := strconv.ParseInt(s, 10, 64)
+		if err == nil {
+			m[id] = true
+		} else {
+			slog.Warn("invalid user ID in BOT_ALLOWED_USERS", "value", s)
+		}
+	}
+	return m
+}
+
+func getEnvDefault(key, defaultValue string) string {
+	if val := os.Getenv(key); val != "" {
+		return val
+	}
+	return defaultValue
+}
+
+func getEnvIntDefault(key string, defaultVal int) int {
+	if val := os.Getenv(key); val != "" {
+		n, err := strconv.Atoi(val)
+		if err == nil {
+			return n
+		}
+	}
+	return defaultVal
+}