Store torrent FileList info as bencoded data. (#530)

Use this instead of joining with forward-slashes because it's possible
that a torrent uses "foo/bar" as a filename or part of the directory list.

model/file.go

@@ -1,14 +1,34 @@
 package model
 
+import (
+	"github.com/zeebo/bencode"
+)
+
 type File struct {
-	ID        uint   `gorm:"column:file_id;primary_key"`
-	TorrentID uint   `gorm:"column:torrent_id;unique_index:idx_tid_path"`
-	Path      string `gorm:"column:path;unique_index:idx_tid_path"`
-	Filesize  int64  `gorm:"column:filesize"`
+	ID           uint   `gorm:"column:file_id;primary_key"`
+	TorrentID    uint   `gorm:"column:torrent_id;unique_index:idx_tid_path"`
+	// this path is bencode'd, call Path() to obtain
+	BencodedPath string `gorm:"column:path;unique_index:idx_tid_path"`
+	Filesize     int64  `gorm:"column:filesize"`
 }
 
 // Returns the total size of memory allocated for this struct
 func (f File) Size() int {
-	return (2 + len(f.Path) + 2) * 8;
+	return (2 + len(f.BencodedPath) + 1) * 8;
+}
+
+func (f *File) Path() (out []string) {
+	bencode.DecodeString(f.BencodedPath, &out)
+	return
+}
+
+func (f *File) SetPath(path []string) error {
+	encoded, err := bencode.EncodeString(path)
+	if err != nil {
+		return err
+	}
+
+	f.BencodedPath = encoded
+	return nil
 }
 

model/torrent.go

@@ -6,6 +6,7 @@ import (
 
 	"fmt"
 	"html/template"
+	"path/filepath"
 	"strconv"
 	"strings"
 	"time"
@@ -131,7 +132,10 @@ func (t *Torrent) ToJSON() TorrentJSON {
 	}
 	fileListJSON := make([]FileJSON, 0, len(t.FileList))
 	for _, f := range t.FileList {
-		fileListJSON = append(fileListJSON, FileJSON{Path: f.Path, Filesize: util.FormatFilesize2(f.Filesize)})
+		fileListJSON = append(fileListJSON, FileJSON{
+			Path: filepath.Join(f.Path()...),
+			Filesize: util.FormatFilesize2(f.Filesize),
+		})
 	}
 	uploader := ""
 	if t.Uploader != nil {

router/upload.go

@@ -27,7 +27,7 @@ import (
 // Use this, because we seem to avoid using models, and we would need
 // the torrent ID to create the File in the DB
 type UploadedFile struct {
-	Path     string
+	Path     []string
 	Filesize int64
 }
 
@@ -161,10 +161,10 @@ func (f *UploadForm) ExtractInfo(r *http.Request) error {
 		
 		// extract filelist
 		fileInfos := torrent.Info.GetFiles()
-		for _, info := range fileInfos {
+		for _, fileInfo := range fileInfos {
 			f.FileList = append(f.FileList, UploadedFile{
-				Path: info.Path.FilePath(),
-				Filesize: int64(info.Length),
+				Path: fileInfo.Path,
+				Filesize: int64(fileInfo.Length),
 			})
 		}
 	} else {

router/uploadHandler.go

@@ -64,10 +64,12 @@ func UploadHandler(w http.ResponseWriter, r *http.Request) {
 			// add filelist to files db, if we have one
 			if len(uploadForm.FileList) > 0 {
 				for _, uploadedFile := range uploadForm.FileList {
-					file := model.File{
-						TorrentID: torrent.ID,
-						Path: uploadedFile.Path,
-						Filesize: uploadedFile.Filesize}
+					file := model.File{TorrentID: torrent.ID, Filesize: uploadedFile.Filesize}
+					err := file.SetPath(uploadedFile.Path)
+					if err != nil {
+						http.Error(w, err.Error(), http.StatusInternalServerError)
+						return
+					}
 					db.ORM.Create(&file)
 				}
 			}

service/torrent/metainfoFetcher/metainfoFetcher.go

@@ -120,23 +120,32 @@ func (fetcher *MetainfoFetcher) removeFromFailed(tID uint) {
 
 	delete(fetcher.failedOperations, tID)
 }
-
 func updateFileList(dbEntry model.Torrent, info *metainfo.Info) error {
 	torrentFiles := info.UpvertedFiles()
 	log.Infof("TID %d has %d files.", dbEntry.ID, len(torrentFiles))
+
 	for _, file := range torrentFiles {
-		path := file.DisplayPath(info)
+		var path []string
+		if file.Path != nil {
+			path = file.Path
+		} else {
+			// If it's nil, use the torrent name (info.Name) as the path (single-file torrent)
+			path = append(path, info.Name)
+		}
 
 		// Can't read FileList from the GetTorrents output, rely on the unique_index
 		// to ensure no files are duplicated.
-		log.Infof("Adding file %s to filelist of TID %d", path, dbEntry.ID)
+		log.Infof("Adding file %s to filelist of TID %d", file.DisplayPath(info), dbEntry.ID)
 		dbFile := model.File{
 			TorrentID: dbEntry.ID,
-			Path: path,
 			Filesize: file.Length,
 		}
+		err := dbFile.SetPath(path)
+		if err != nil {
+			return err
+		}
 
-		err := db.ORM.Create(&dbFile).Error
+		err = db.ORM.Create(&dbFile).Error
 		if err != nil {
 			return err
 		}