fix(downloads): support Transmission and aria2 end to end

Fixes #65

internal/service/qbittorrent_adp.go

@@ -7,6 +7,7 @@ package service
 import (
 	"bytes"
 	"context"
+	"errors"
 	"fmt"
 	"io"
 	"mime/multipart"
@@ -61,6 +62,12 @@ func (a *QBitAdapter) Ping(ctx context.Context) error {
 
 // AddTorrent 通过 URL 添加种子。
 func (a *QBitAdapter) AddTorrent(ctx context.Context, torrentURL, savePath string) (string, error) {
+	return a.AddTorrentWithCategory(ctx, torrentURL, savePath, "")
+}
+
+// AddTorrentWithCategory submits a URL or magnet while preserving the
+// qBittorrent category selected by MediaStationGo's classification rules.
+func (a *QBitAdapter) AddTorrentWithCategory(ctx context.Context, torrentURL, savePath, category string) (string, error) {
 	a.mu.Lock()
 	defer a.mu.Unlock()
 	if err := a.ensureAuthLocked(ctx); err != nil {
@@ -70,10 +77,49 @@ func (a *QBitAdapter) AddTorrent(ctx context.Context, torrentURL, savePath strin
 	body := &bytes.Buffer{}
 	w := multipart.NewWriter(body)
 	_ = w.WriteField("urls", torrentURL)
+	return a.addTorrentMultipartLocked(ctx, body, w, savePath, category, torrentURLInfoHash(torrentURL))
+}
+
+// AddMagnet 通过磁力链接添加种子。
+func (a *QBitAdapter) AddMagnet(ctx context.Context, magnet, savePath string) (string, error) {
+	return a.AddTorrent(ctx, magnet, savePath)
+}
+
+// AddTorrentFile uploads .torrent bytes as multipart/form-data.
+func (a *QBitAdapter) AddTorrentFile(ctx context.Context, data []byte, name, savePath string) (string, error) {
+	return a.AddTorrentFileWithCategory(ctx, data, name, savePath, "")
+}
+
+// AddTorrentFileWithCategory uploads .torrent bytes and preserves the
+// qBittorrent category selected by the caller.
+func (a *QBitAdapter) AddTorrentFileWithCategory(ctx context.Context, data []byte, name, savePath, category string) (string, error) {
+	a.mu.Lock()
+	defer a.mu.Unlock()
+	if err := a.ensureAuthLocked(ctx); err != nil {
+		return "", err
+	}
+	body := &bytes.Buffer{}
+	w := multipart.NewWriter(body)
+	part, err := w.CreateFormFile("torrents", name)
+	if err != nil {
+		return "", err
+	}
+	if _, err := part.Write(data); err != nil {
+		return "", err
+	}
+	return a.addTorrentMultipartLocked(ctx, body, w, savePath, category, torrentInfoHash(data))
+}
+
+func (a *QBitAdapter) addTorrentMultipartLocked(ctx context.Context, body *bytes.Buffer, w *multipart.Writer, savePath, category, externalID string) (string, error) {
 	if savePath != "" {
 		_ = w.WriteField("savepath", savePath)
 	}
-	_ = w.Close()
+	if category != "" {
+		_ = w.WriteField("category", category)
+	}
+	if err := w.Close(); err != nil {
+		return "", err
+	}
 
 	baseURL := strings.TrimRight(a.cfg.Host, "/")
 	req, err := newDownloadClientHTTPRequest(ctx, http.MethodPost,
@@ -95,14 +141,9 @@ func (a *QBitAdapter) AddTorrent(ctx context.Context, torrentURL, savePath strin
 		return "", fmt.Errorf("qbittorrent add torrent: %d: %s", resp.StatusCode, strings.TrimSpace(string(raw)))
 	}
 	if strings.EqualFold(strings.TrimSpace(string(raw)), "Fails.") {
-		return "", fmt.Errorf("qbittorrent add torrent: rejected by downloader")
+		return externalID, errors.New("qbittorrent add torrent: rejected by downloader")
 	}
-	return "", nil
-}
-
-// AddMagnet 通过磁力链接添加种子。
-func (a *QBitAdapter) AddMagnet(ctx context.Context, magnet, savePath string) (string, error) {
-	return a.AddTorrent(ctx, magnet, savePath)
+	return externalID, nil
 }
 
 // Pause 暂停种子。
@@ -193,6 +234,36 @@ func (a *QBitAdapter) Remove(ctx context.Context, hash string, deleteFiles bool)
 	return nil
 }
 
+func (a *QBitAdapter) Relocate(ctx context.Context, hash, location string) error {
+	a.mu.Lock()
+	defer a.mu.Unlock()
+	if err := a.ensureAuthLocked(ctx); err != nil {
+		return err
+	}
+	baseURL := strings.TrimRight(a.cfg.Host, "/")
+	form := url.Values{}
+	form.Set("hashes", hash)
+	form.Set("location", location)
+	req, err := newDownloadClientHTTPRequest(ctx, http.MethodPost,
+		baseURL+"/api/v2/torrents/setLocation", strings.NewReader(form.Encode()))
+	if err != nil {
+		return err
+	}
+	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
+	req.Header.Set("Referer", baseURL)
+	req.Header.Set("Origin", baseURL)
+	resp, err := a.client.Do(req)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+	body, _ := io.ReadAll(resp.Body)
+	if resp.StatusCode >= 400 {
+		return fmt.Errorf("qbittorrent setLocation: %d: %s", resp.StatusCode, strings.TrimSpace(string(body)))
+	}
+	return nil
+}
+
 // loginLocked 执行登录（调用者必须持有锁）。
 func (a *QBitAdapter) loginLocked(ctx context.Context) error {
 	if a.cfg.Host == "" {