91 lines
1.9 KiB
Go
91 lines
1.9 KiB
Go
package dl
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import (
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"errors"
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"fmt"
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"os"
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"os/exec"
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"path/filepath"
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"regexp"
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"strings"
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)
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var (
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urlMatchRegex = regexp.MustCompile(`(magnet|torrent\+https?):.*`)
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ErrAria2NotFound = errors.New("aria2 must be installed for torrent functionality")
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ErrDestinationEmpty = errors.New("the destination directory is empty")
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)
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type TorrentDownloader struct{}
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// Name always returns "file"
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func (TorrentDownloader) Name() string {
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return "torrent"
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}
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// MatchURL returns true if the URL is a magnet link
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// or an http(s) link with a "torrent+" prefix
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func (TorrentDownloader) MatchURL(u string) bool {
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return urlMatchRegex.MatchString(u)
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}
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// Download downloads a file over the BitTorrent protocol.
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func (TorrentDownloader) Download(opts Options) (Type, string, error) {
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aria2Path, err := exec.LookPath("aria2c")
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if err != nil {
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return 0, "", ErrAria2NotFound
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}
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opts.URL = strings.TrimPrefix(opts.URL, "torrent+")
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cmd := exec.Command(aria2Path, "--summary-interval=0", "--log-level=warn", "--seed-time=0", "--dir="+opts.Destination, opts.URL)
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cmd.Stdout = os.Stdout
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cmd.Stderr = os.Stderr
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err = cmd.Run()
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if err != nil {
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return 0, "", fmt.Errorf("aria2c returned an error: %w", err)
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}
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err = removeTorrentFiles(opts.Destination)
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if err != nil {
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return 0, "", err
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}
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return determineType(opts.Destination)
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}
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func removeTorrentFiles(path string) error {
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filePaths, err := filepath.Glob(filepath.Join(path, "*.torrent"))
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if err != nil {
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return err
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}
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for _, filePath := range filePaths {
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err = os.Remove(filePath)
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if err != nil {
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return err
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}
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}
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return nil
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}
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func determineType(path string) (Type, string, error) {
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files, err := os.ReadDir(path)
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if err != nil {
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return 0, "", err
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}
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if len(files) > 1 {
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return TypeDir, "", nil
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} else if len(files) == 1 {
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if files[0].IsDir() {
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return TypeDir, files[0].Name(), nil
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} else {
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return TypeFile, files[0].Name(), nil
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}
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}
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return 0, "", ErrDestinationEmpty
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}
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