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feat: download to writer for medias. #704

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feat: download to writer for medias. #704

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19 changes: 19 additions & 0 deletions bot.go
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Original file line number Diff line number Diff line change
Expand Up @@ -903,6 +903,25 @@ func (b *Bot) Download(file *File, localFilename string) error {
return nil
}

// DownloadToWriter stream the file from Telegram servers to an io.Writer interface,
// This can be used for cases that you want to get the file from one server,
// and directly upload it to another server without saving it locally.
// Maximum file size to download is 20 MB.
func (b *Bot) DownloadToWriter(file *File, writer io.Writer) error {
reader, err := b.File(file)
if err != nil {
return err
}
defer reader.Close()

_, err = io.Copy(writer, reader)
if err != nil {
return wrapError(err)
}

return nil
}

// File gets a file from Telegram servers.
func (b *Bot) File(file *File) (io.ReadCloser, error) {
f, err := b.FileByID(file.FileID)
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