forked from Plemya-x/ALR
111 lines
2.9 KiB
Go
111 lines
2.9 KiB
Go
// This file was originally part of the project "LURE - Linux User REpository", created by Elara Musayelyan.
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// It has been modified as part of "ALR - Any Linux Repository" by Евгений Храмов.
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//
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// ALR - Any Linux Repository
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// Copyright (C) 2025 Евгений Храмов
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package dl
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import (
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"context"
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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(ctx context.Context, 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.CommandContext(ctx, 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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