feat: initial commit

internal/infrastructure/telegram/file_downloader.go

@@ -0,0 +1,48 @@
+package telegram
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"net/http"
+
+	tgbotapi "github.com/go-telegram-bot-api/telegram-bot-api/v5"
+)
+
+type TelegramFileDownloader struct {
+	bot    *tgbotapi.BotAPI
+	client *http.Client
+}
+
+func NewTelegramFileDownloader(bot *tgbotapi.BotAPI) *TelegramFileDownloader {
+	return &TelegramFileDownloader{
+		bot:    bot,
+		client: &http.Client{},
+	}
+}
+
+func (d *TelegramFileDownloader) Download(ctx context.Context, fileID string) ([]byte, string, error) {
+	file, err := d.bot.GetFile(tgbotapi.FileConfig{FileID: fileID})
+	if err != nil {
+		return nil, "", fmt.Errorf("get file info: %w", err)
+	}
+
+	url := file.Link(d.bot.Token)
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
+	if err != nil {
+		return nil, "", fmt.Errorf("create download request: %w", err)
+	}
+
+	resp, err := d.client.Do(req)
+	if err != nil {
+		return nil, "", fmt.Errorf("download file: %w", err)
+	}
+	defer resp.Body.Close()
+
+	data, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, "", fmt.Errorf("read file body: %w", err)
+	}
+
+	return data, "audio/ogg", nil
+}