filestore: Expose .info path and fix absolute paths (#1162)

* filestore: Allow providing custom, absolute paths

* filestore: Expose path to `.info` file in hooks

docs/_advanced-topics/hooks.md

@@ -83,9 +83,11 @@ Below you can find an annotated, JSON-ish encoded example of a hook request:
             // Storage contains information about where the upload is stored. The exact values
             // depend on the storage that is used and are not available in the pre-create hook.
             "Storage": {
-                 // For example, the filestore supplies the absolute file path:
+                 // For example, the filestore supplies the absolute file paths where the upload data
+                 // (Path) and the associated info file (InfoPath) are stored:
                  "Type": "filestore",
                  "Path": "/my/upload/directory/14b1c4c77771671a8479bc0444bbc5ce",
+                 "InfoPath": "/my/upload/directory/14b1c4c77771671a8479bc0444bbc5ce.info",
 
                  // The S3Store and GCSStore supply the bucket name and object key:
                  "Type": "s3store",

pkg/filestore/filestore.go

@@ -62,14 +62,22 @@ func (store FileStore) NewUpload(ctx context.Context, info handler.FileInfo) (ha
 	// The binary file's location might be modified by the pre-create hook.
 	var binPath string
 	if info.Storage != nil && info.Storage["Path"] != "" {
-		binPath = filepath.Join(store.Path, info.Storage["Path"])
+		// filepath.Join treats absolute and relative paths the same, so we must
+		// handle them on our own. Absolute paths get used as-is, while relative
+		// paths are joined to the storage path.
+		if filepath.IsAbs(info.Storage["Path"]) {
+			binPath = info.Storage["Path"]
+		} else {
+			binPath = filepath.Join(store.Path, info.Storage["Path"])
+		}
 	} else {
 		binPath = store.defaultBinPath(info.ID)
 	}
 
 	info.Storage = map[string]string{
-		"Type": "filestore",
-		"Path": binPath,
+		"Type":     "filestore",
+		"Path":     binPath,
+		"InfoPath": infoPath,
 	}
 
 	// Create binary file with no content

pkg/filestore/filestore_test.go

@@ -43,9 +43,10 @@ func TestFilestore(t *testing.T) {
 	a.EqualValues(42, info.Size)
 	a.EqualValues(0, info.Offset)
 	a.Equal(handler.MetaData{"hello": "world"}, info.MetaData)
-	a.Equal(2, len(info.Storage))
+	a.Equal(3, len(info.Storage))
 	a.Equal("filestore", info.Storage["Type"])
 	a.Equal(filepath.Join(tmp, info.ID), info.Storage["Path"])
+	a.Equal(filepath.Join(tmp, info.ID+".info"), info.Storage["InfoPath"])
 
 	// Write data to upload
 	bytesWritten, err := upload.WriteChunk(ctx, 0, strings.NewReader("hello world"))
@@ -104,9 +105,10 @@ func TestCreateDirectories(t *testing.T) {
 	a.EqualValues(42, info.Size)
 	a.EqualValues(0, info.Offset)
 	a.Equal(handler.MetaData{"hello": "world"}, info.MetaData)
-	a.Equal(2, len(info.Storage))
+	a.Equal(3, len(info.Storage))
 	a.Equal("filestore", info.Storage["Type"])
 	a.Equal(filepath.Join(tmp, info.ID), info.Storage["Path"])
+	a.Equal(filepath.Join(tmp, info.ID+".info"), info.Storage["InfoPath"])
 
 	// Write data to upload
 	bytesWritten, err := upload.WriteChunk(ctx, 0, strings.NewReader("hello world"))
@@ -246,8 +248,9 @@ func TestDeclareLength(t *testing.T) {
 	a.Equal(false, updatedInfo.SizeIsDeferred)
 }
 
-// TestCustomPath tests whether the upload's destination can be customized.
-func TestCustomPath(t *testing.T) {
+// TestCustomRelativePath tests whether the upload's destination can be customized
+// relative to the storage directory.
+func TestCustomRelativePath(t *testing.T) {
 	a := assert.New(t)
 
 	tmp, err := os.MkdirTemp("", "tusd-filestore-")
@@ -272,9 +275,10 @@ func TestCustomPath(t *testing.T) {
 	a.NoError(err)
 	a.EqualValues(42, info.Size)
 	a.EqualValues(0, info.Offset)
-	a.Equal(2, len(info.Storage))
+	a.Equal(3, len(info.Storage))
 	a.Equal("filestore", info.Storage["Type"])
 	a.Equal(filepath.Join(tmp, "./folder2/bin"), info.Storage["Path"])
+	a.Equal(filepath.Join(tmp, "./folder1/info.info"), info.Storage["InfoPath"])
 
 	// Write data to upload
 	bytesWritten, err := upload.WriteChunk(ctx, 0, strings.NewReader("hello world"))
@@ -313,3 +317,44 @@ func TestCustomPath(t *testing.T) {
 	a.Equal(nil, upload)
 	a.Equal(handler.ErrNotFound, err)
 }
+
+// TestCustomAbsolutePath tests whether the upload's destination can be customized
+// using an absolute path to the storage directory.
+func TestCustomAbsolutePath(t *testing.T) {
+	a := assert.New(t)
+
+	tmp1, err := os.MkdirTemp("", "tusd-filestore-")
+	a.NoError(err)
+
+	tmp2, err := os.MkdirTemp("", "tusd-filestore-")
+	a.NoError(err)
+
+	store := FileStore{tmp1}
+	ctx := context.Background()
+
+	// Create new upload, but the Path property points to a directory
+	// outside of the directory given to FileStore
+	binPath := filepath.Join(tmp2, "dir/my-upload.bin")
+	upload, err := store.NewUpload(ctx, handler.FileInfo{
+		ID:   "my-upload",
+		Size: 42,
+		Storage: map[string]string{
+			"Path": binPath,
+		},
+	})
+	a.NoError(err)
+	a.NotEqual(nil, upload)
+
+	info, err := upload.GetInfo(ctx)
+	a.NoError(err)
+	a.EqualValues(42, info.Size)
+	a.EqualValues(0, info.Offset)
+	a.Equal(3, len(info.Storage))
+	a.Equal("filestore", info.Storage["Type"])
+	a.Equal(binPath, info.Storage["Path"])
+	a.Equal(filepath.Join(tmp1, "my-upload.info"), info.Storage["InfoPath"])
+
+	statInfo, err := os.Stat(binPath)
+	a.NoError(err)
+	a.True(statInfo.Mode().IsRegular())
+}