Add findFolder and findFolders queries to graphql schema (#5965)

* Add findFolder and findFolders queries to graphql schema
* Add zip file criterion to file and folder queries

graphql/schema/schema.graphql

@@ -16,6 +16,16 @@ type Query {
     ids: [ID!]
   ): FindFilesResultType!
 
+  "Find a file by its id or path"
+  findFolder(id: ID, path: String): Folder!
+
+  "Queries for Files"
+  findFolders(
+    folder_filter: FolderFilterType
+    filter: FindFilterType
+    ids: [ID!]
+  ): FindFoldersResultType!
+
   "Find a scene by ID or Checksum"
   findScene(id: ID, checksum: String): Scene
   findSceneByHash(input: SceneHashInput!): Scene

graphql/schema/types/file.graphql

@@ -10,7 +10,7 @@ type Folder {
   parent_folder_id: ID @deprecated(reason: "Use parent_folder instead")
   zip_file_id: ID @deprecated(reason: "Use zip_file instead")
 
-  parent_folder: Folder!
+  parent_folder: Folder
   zip_file: BasicFile
 
   mod_time: Time!
@@ -176,3 +176,8 @@ type FindFilesResultType {
 
   files: [BaseFile!]!
 }
+
+type FindFoldersResultType {
+  count: Int!
+  folders: [Folder!]!
+}

graphql/schema/types/filters.graphql

@@ -691,6 +691,7 @@ input FileFilterType {
   dir: StringCriterionInput
 
   parent_folder: HierarchicalMultiCriterionInput
+  zip_file: MultiCriterionInput
 
   "Filter by modification time"
   mod_time: TimestampCriterionInput
@@ -721,6 +722,32 @@ input FileFilterType {
   updated_at: TimestampCriterionInput
 }
 
+input FolderFilterType {
+  AND: FolderFilterType
+  OR: FolderFilterType
+  NOT: FolderFilterType
+
+  path: StringCriterionInput
+
+  parent_folder: HierarchicalMultiCriterionInput
+  zip_file: MultiCriterionInput
+
+  "Filter by modification time"
+  mod_time: TimestampCriterionInput
+
+  gallery_count: IntCriterionInput
+
+  "Filter by files that meet this criteria"
+  files_filter: FileFilterType
+  "Filter by related galleries that meet this criteria"
+  galleries_filter: GalleryFilterType
+
+  "Filter by creation time"
+  created_at: TimestampCriterionInput
+  "Filter by last update time"
+  updated_at: TimestampCriterionInput
+}
+
 input VideoFileFilterInput {
   resolution: ResolutionCriterionInput
   orientation: OrientationCriterionInput

internal/api/resolver_query_find_folder.go

@@ -0,0 +1,100 @@
+package api
+
+import (
+	"context"
+	"errors"
+	"strconv"
+
+	"github.com/stashapp/stash/pkg/models"
+	"github.com/stashapp/stash/pkg/sliceutil/stringslice"
+)
+
+func (r *queryResolver) FindFolder(ctx context.Context, id *string, path *string) (*models.Folder, error) {
+	var ret *models.Folder
+	if err := r.withReadTxn(ctx, func(ctx context.Context) error {
+		qb := r.repository.Folder
+		var err error
+		switch {
+		case id != nil:
+			idInt, err := strconv.Atoi(*id)
+			if err != nil {
+				return err
+			}
+			ret, err = qb.Find(ctx, models.FolderID(idInt))
+			if err != nil {
+				return err
+			}
+		case path != nil:
+			ret, err = qb.FindByPath(ctx, *path)
+			if err == nil && ret == nil {
+				return errors.New("folder not found")
+			}
+		default:
+			return errors.New("either id or path must be provided")
+		}
+
+		return err
+	}); err != nil {
+		return nil, err
+	}
+
+	return ret, nil
+}
+
+func (r *queryResolver) FindFolders(
+	ctx context.Context,
+	folderFilter *models.FolderFilterType,
+	filter *models.FindFilterType,
+	ids []string,
+) (ret *FindFoldersResultType, err error) {
+	var folderIDs []models.FolderID
+	if len(ids) > 0 {
+		folderIDsInt, err := stringslice.StringSliceToIntSlice(ids)
+		if err != nil {
+			return nil, err
+		}
+
+		folderIDs = models.FolderIDsFromInts(folderIDsInt)
+	}
+
+	if err := r.withReadTxn(ctx, func(ctx context.Context) error {
+		var folders []*models.Folder
+		var err error
+
+		fields := collectQueryFields(ctx)
+		result := &models.FolderQueryResult{}
+
+		if len(folderIDs) > 0 {
+			folders, err = r.repository.Folder.FindMany(ctx, folderIDs)
+			if err == nil {
+				result.Count = len(folders)
+			}
+		} else {
+			result, err = r.repository.Folder.Query(ctx, models.FolderQueryOptions{
+				QueryOptions: models.QueryOptions{
+					FindFilter: filter,
+					Count:      fields.Has("count"),
+				},
+				FolderFilter: folderFilter,
+			})
+			if err == nil {
+				folders, err = result.Resolve(ctx)
+			}
+		}
+
+		if err != nil {
+			return err
+		}
+
+		ret = &FindFoldersResultType{
+			Count:   result.Count,
+			Folders: folders,
+		}
+
+		return nil
+	}); err != nil {
+		return nil, err
+	}
+
+	return ret, nil
+}

pkg/models/file.go

@@ -24,6 +24,7 @@ type FileFilterType struct {
 	Basename        *StringCriterionInput            `json:"basename"`
 	Dir             *StringCriterionInput            `json:"dir"`
 	ParentFolder    *HierarchicalMultiCriterionInput `json:"parent_folder"`
+	ZipFile         *MultiCriterionInput             `json:"zip_file"`
 	ModTime         *TimestampCriterionInput         `json:"mod_time"`
 	Duplicated      *PHashDuplicationCriterionInput  `json:"duplicated"`
 	Hashes          []*FingerprintFilterInput        `json:"hashes"`

pkg/models/folder.go

@@ -0,0 +1,92 @@
+package models
+
+import (
+	"context"
+	"path/filepath"
+	"strings"
+)
+
+type FolderQueryOptions struct {
+	QueryOptions
+	FolderFilter *FolderFilterType
+
+	TotalDuration bool
+	Megapixels    bool
+	TotalSize     bool
+}
+
+type FolderFilterType struct {
+	OperatorFilter[FolderFilterType]
+
+	Path     *StringCriterionInput `json:"path,omitempty"`
+	Basename *StringCriterionInput `json:"basename,omitempty"`
+	// Filter by parent directory path
+	Dir          *StringCriterionInput            `json:"dir,omitempty"`
+	ParentFolder *HierarchicalMultiCriterionInput `json:"parent_folder,omitempty"`
+	ZipFile      *MultiCriterionInput             `json:"zip_file,omitempty"`
+	// Filter by modification time
+	ModTime      *TimestampCriterionInput `json:"mod_time,omitempty"`
+	GalleryCount *IntCriterionInput       `json:"gallery_count,omitempty"`
+	// Filter by files that meet this criteria
+	FilesFilter *FileFilterType `json:"files_filter,omitempty"`
+	// Filter by related galleries that meet this criteria
+	GalleriesFilter *GalleryFilterType `json:"galleries_filter,omitempty"`
+	// Filter by creation time
+	CreatedAt *TimestampCriterionInput `json:"created_at,omitempty"`
+	// Filter by last update time
+	UpdatedAt *TimestampCriterionInput `json:"updated_at,omitempty"`
+}
+
+func PathsFolderFilter(paths []string) *FileFilterType {
+	if paths == nil {
+		return nil
+	}
+
+	sep := string(filepath.Separator)
+
+	var ret *FileFilterType
+	var or *FileFilterType
+	for _, p := range paths {
+		newOr := &FileFilterType{}
+		if or != nil {
+			or.Or = newOr
+		} else {
+			ret = newOr
+		}
+
+		or = newOr
+
+		if !strings.HasSuffix(p, sep) {
+			p += sep
+		}
+
+		or.Path = &StringCriterionInput{
+			Modifier: CriterionModifierEquals,
+			Value:    p + "%",
+		}
+	}
+
+	return ret
+}
+
+type FolderQueryResult struct {
+	QueryResult[FolderID]
+
+	getter     FolderGetter
+	folders    []*Folder
+	resolveErr error
+}
+
+func NewFolderQueryResult(folderGetter FolderGetter) *FolderQueryResult {
+	return &FolderQueryResult{
+		getter: folderGetter,
+	}
+}
+
+func (r *FolderQueryResult) Resolve(ctx context.Context) ([]*Folder, error) {
+	// cache results
+	if r.folders == nil && r.resolveErr == nil {
+		r.folders, r.resolveErr = r.getter.FindMany(ctx, r.IDs)
+	}
+	return r.folders, r.resolveErr
+}

pkg/models/mocks/FolderReaderWriter.go

@@ -201,6 +201,29 @@ func (_m *FolderReaderWriter) FindMany(ctx context.Context, id []models.FolderID
 	return r0, r1
 }
 
+// Query provides a mock function with given fields: ctx, options
+func (_m *FolderReaderWriter) Query(ctx context.Context, options models.FolderQueryOptions) (*models.FolderQueryResult, error) {
+	ret := _m.Called(ctx, options)
+
+	var r0 *models.FolderQueryResult
+	if rf, ok := ret.Get(0).(func(context.Context, models.FolderQueryOptions) *models.FolderQueryResult); ok {
+		r0 = rf(ctx, options)
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(*models.FolderQueryResult)
+		}
+	}
+
+	var r1 error
+	if rf, ok := ret.Get(1).(func(context.Context, models.FolderQueryOptions) error); ok {
+		r1 = rf(ctx, options)
+	} else {
+		r1 = ret.Error(1)
+	}
+
+	return r0, r1
+}
+
 // Update provides a mock function with given fields: ctx, f
 func (_m *FolderReaderWriter) Update(ctx context.Context, f *models.Folder) error {
 	ret := _m.Called(ctx, f)

pkg/models/model_folder.go

@@ -35,6 +35,14 @@ func (i FolderID) MarshalGQL(w io.Writer) {
 	fmt.Fprint(w, strconv.Quote(i.String()))
 }
 
+func FolderIDsFromInts(ids []int) []FolderID {
+	ret := make([]FolderID, len(ids))
+	for i, id := range ids {
+		ret[i] = FolderID(id)
+	}
+	return ret
+}
+
 // Folder represents a folder in the file system.
 type Folder struct {
 	ID FolderID `json:"id"`

pkg/models/repository_folder.go

@@ -17,6 +17,10 @@ type FolderFinder interface {
 	FindByParentFolderID(ctx context.Context, parentFolderID FolderID) ([]*Folder, error)
 }
 
+type FolderQueryer interface {
+	Query(ctx context.Context, options FolderQueryOptions) (*FolderQueryResult, error)
+}
+
 type FolderCounter interface {
 	CountAllInPaths(ctx context.Context, p []string) (int, error)
 }
@@ -48,6 +52,7 @@ type FolderFinderDestroyer interface {
 // FolderReader provides all methods to read folders.
 type FolderReader interface {
 	FolderFinder
+	FolderQueryer
 	FolderCounter
 }
 

pkg/sqlite/file.go

@@ -321,7 +321,7 @@ type FileStore struct {
 func NewFileStore() *FileStore {
 	return &FileStore{
 		repository: repository{
-			tableName: sceneTable,
+			tableName: fileTable,
 			idColumn:  idColumn,
 		},
 

pkg/sqlite/file_filter.go

@@ -68,6 +68,7 @@ func (qb *fileFilterHandler) criterionHandler() criterionHandler {
 		&timestampCriterionHandler{fileFilter.ModTime, "files.mod_time", nil},
 
 		qb.parentFolderCriterionHandler(fileFilter.ParentFolder),
+		qb.zipFileCriterionHandler(fileFilter.ZipFile),
 
 		qb.sceneCountCriterionHandler(fileFilter.SceneCount),
 		qb.imageCountCriterionHandler(fileFilter.ImageCount),
@@ -106,6 +107,43 @@ func (qb *fileFilterHandler) criterionHandler() criterionHandler {
 	}
 }
 
+func (qb *fileFilterHandler) zipFileCriterionHandler(criterion *models.MultiCriterionInput) criterionHandlerFunc {
+	return func(ctx context.Context, f *filterBuilder) {
+		if criterion != nil {
+			if criterion.Modifier == models.CriterionModifierIsNull || criterion.Modifier == models.CriterionModifierNotNull {
+				var notClause string
+				if criterion.Modifier == models.CriterionModifierNotNull {
+					notClause = "NOT"
+				}
+
+				f.addWhere(fmt.Sprintf("files.zip_file_id IS %s NULL", notClause))
+				return
+			}
+
+			if len(criterion.Value) == 0 {
+				return
+			}
+
+			var args []interface{}
+			for _, tagID := range criterion.Value {
+				args = append(args, tagID)
+			}
+
+			whereClause := ""
+			havingClause := ""
+			switch criterion.Modifier {
+			case models.CriterionModifierIncludes:
+				whereClause = "files.zip_file_id IN " + getInBinding(len(criterion.Value))
+			case models.CriterionModifierExcludes:
+				whereClause = "files.zip_file_id NOT IN " + getInBinding(len(criterion.Value))
+			}
+
+			f.addWhere(whereClause, args...)
+			f.addHaving(havingClause)
+		}
+	}
+}
+
 func (qb *fileFilterHandler) parentFolderCriterionHandler(folder *models.HierarchicalMultiCriterionInput) criterionHandlerFunc {
 	return func(ctx context.Context, f *filterBuilder) {
 		if folder == nil {

pkg/sqlite/file_filter_test.go

@@ -18,7 +18,7 @@ func TestFileQuery(t *testing.T) {
 		findFilter  *models.FindFilterType
 		filter      *models.FileFilterType
 		includeIdxs []int
-		includeIDs  []int
+		includeIDs  []models.FileID
 		excludeIdxs []int
 		wantErr     bool
 	}{
@@ -52,7 +52,7 @@ func TestFileQuery(t *testing.T) {
 					Modifier: models.CriterionModifierIncludes,
 				},
 			},
-			includeIDs:  []int{int(sceneFileIDs[sceneIdxWithGroup])},
+			includeIDs:  []models.FileID{sceneFileIDs[sceneIdxWithGroup]},
 			excludeIdxs: []int{fileIdxStartImageFiles},
 		},
 		{
@@ -65,7 +65,20 @@ func TestFileQuery(t *testing.T) {
 					Modifier: models.CriterionModifierIncludes,
 				},
 			},
-			includeIDs:  []int{int(sceneFileIDs[sceneIdxWithGroup])},
+			includeIDs:  []models.FileID{sceneFileIDs[sceneIdxWithGroup]},
+			excludeIdxs: []int{fileIdxStartImageFiles},
+		},
+		{
+			name: "zip file",
+			filter: &models.FileFilterType{
+				ZipFile: &models.MultiCriterionInput{
+					Value: []string{
+						strconv.Itoa(int(fileIDs[fileIdxZip])),
+					},
+					Modifier: models.CriterionModifierIncludes,
+				},
+			},
+			includeIDs:  []models.FileID{fileIDs[fileIdxInZip]},
 			excludeIdxs: []int{fileIdxStartImageFiles},
 		},
 		// TODO - add more tests for other file filters
@@ -86,15 +99,18 @@ func TestFileQuery(t *testing.T) {
 				return
 			}
 
-			include := indexesToIDs(sceneIDs, tt.includeIdxs)
-			include = append(include, tt.includeIDs...)
-			exclude := indexesToIDs(sceneIDs, tt.excludeIdxs)
+			include := indexesToIDPtrs(fileIDs, tt.includeIdxs)
+			for _, id := range tt.includeIDs {
+				v := id
+				include = append(include, &v)
+			}
+			exclude := indexesToIDPtrs(fileIDs, tt.excludeIdxs)
 
 			for _, i := range include {
-				assert.Contains(results.IDs, models.FileID(i))
+				assert.Contains(results.IDs, models.FileID(*i))
 			}
 			for _, e := range exclude {
-				assert.NotContains(results.IDs, models.FileID(e))
+				assert.NotContains(results.IDs, models.FileID(*e))
 			}
 		})
 	}

pkg/sqlite/folder.go

@@ -16,6 +16,7 @@ import (
 )
 
 const folderTable = "folders"
+const folderIDColumn = "folder_id"
 
 type folderRow struct {
 	ID             models.FolderID `db:"id" goqu:"skipinsert"`
@@ -83,6 +84,25 @@ func (r folderQueryRows) resolve() []*models.Folder {
 	return ret
 }
 
+type folderRepositoryType struct {
+	repository
+
+	galleries repository
+}
+
+var (
+	folderRepository = folderRepositoryType{
+		repository: repository{
+			tableName: folderTable,
+			idColumn:  idColumn,
+		},
+		galleries: repository{
+			tableName: galleryTable,
+			idColumn:  folderIDColumn,
+		},
+	}
+)
+
 type FolderStore struct {
 	repository
 
@@ -92,7 +112,7 @@ type FolderStore struct {
 func NewFolderStore() *FolderStore {
 	return &FolderStore{
 		repository: repository{
-			tableName: sceneTable,
+			tableName: folderTable,
 			idColumn:  idColumn,
 		},
 
@@ -360,3 +380,162 @@ func (qb *FolderStore) FindByZipFileID(ctx context.Context, zipFileID models.Fil
 
 	return qb.getMany(ctx, q)
 }
+
+func (qb *FolderStore) validateFilter(fileFilter *models.FolderFilterType) error {
+	const and = "AND"
+	const or = "OR"
+	const not = "NOT"
+
+	if fileFilter.And != nil {
+		if fileFilter.Or != nil {
+			return illegalFilterCombination(and, or)
+		}
+		if fileFilter.Not != nil {
+			return illegalFilterCombination(and, not)
+		}
+
+		return qb.validateFilter(fileFilter.And)
+	}
+
+	if fileFilter.Or != nil {
+		if fileFilter.Not != nil {
+			return illegalFilterCombination(or, not)
+		}
+
+		return qb.validateFilter(fileFilter.Or)
+	}
+
+	if fileFilter.Not != nil {
+		return qb.validateFilter(fileFilter.Not)
+	}
+
+	return nil
+}
+
+func (qb *FolderStore) makeFilter(ctx context.Context, folderFilter *models.FolderFilterType) *filterBuilder {
+	query := &filterBuilder{}
+
+	if folderFilter.And != nil {
+		query.and(qb.makeFilter(ctx, folderFilter.And))
+	}
+	if folderFilter.Or != nil {
+		query.or(qb.makeFilter(ctx, folderFilter.Or))
+	}
+	if folderFilter.Not != nil {
+		query.not(qb.makeFilter(ctx, folderFilter.Not))
+	}
+
+	filter := filterBuilderFromHandler(ctx, &folderFilterHandler{
+		folderFilter: folderFilter,
+	})
+
+	return filter
+}
+
+func (qb *FolderStore) Query(ctx context.Context, options models.FolderQueryOptions) (*models.FolderQueryResult, error) {
+	folderFilter := options.FolderFilter
+	findFilter := options.FindFilter
+
+	if folderFilter == nil {
+		folderFilter = &models.FolderFilterType{}
+	}
+	if findFilter == nil {
+		findFilter = &models.FindFilterType{}
+	}
+
+	query := qb.newQuery()
+
+	distinctIDs(&query, folderTable)
+
+	if q := findFilter.Q; q != nil && *q != "" {
+		searchColumns := []string{"folders.path"}
+		query.parseQueryString(searchColumns, *q)
+	}
+
+	if err := qb.validateFilter(folderFilter); err != nil {
+		return nil, err
+	}
+	filter := qb.makeFilter(ctx, folderFilter)
+
+	if err := query.addFilter(filter); err != nil {
+		return nil, err
+	}
+
+	if err := qb.setQuerySort(&query, findFilter); err != nil {
+		return nil, err
+	}
+	query.sortAndPagination += getPagination(findFilter)
+
+	result, err := qb.queryGroupedFields(ctx, options, query)
+	if err != nil {
+		return nil, fmt.Errorf("error querying aggregate fields: %w", err)
+	}
+
+	idsResult, err := query.findIDs(ctx)
+	if err != nil {
+		return nil, fmt.Errorf("error finding IDs: %w", err)
+	}
+
+	result.IDs = make([]models.FolderID, len(idsResult))
+	for i, id := range idsResult {
+		result.IDs[i] = models.FolderID(id)
+	}
+
+	return result, nil
+}
+
+func (qb *FolderStore) queryGroupedFields(ctx context.Context, options models.FolderQueryOptions, query queryBuilder) (*models.FolderQueryResult, error) {
+	if !options.Count {
+		// nothing to do - return empty result
+		return models.NewFolderQueryResult(qb), nil
+	}
+
+	aggregateQuery := qb.newQuery()
+
+	if options.Count {
+		aggregateQuery.addColumn("COUNT(DISTINCT temp.id) as total")
+	}
+
+	const includeSortPagination = false
+	aggregateQuery.from = fmt.Sprintf("(%s) as temp", query.toSQL(includeSortPagination))
+
+	out := struct {
+		Total      int
+		Duration   float64
+		Megapixels float64
+		Size       int64
+	}{}
+	if err := qb.repository.queryStruct(ctx, aggregateQuery.toSQL(includeSortPagination), query.args, &out); err != nil {
+		return nil, err
+	}
+
+	ret := models.NewFolderQueryResult(qb)
+	ret.Count = out.Total
+
+	return ret, nil
+}
+
+var folderSortOptions = sortOptions{
+	"created_at",
+	"id",
+	"path",
+	"random",
+	"updated_at",
+}
+
+func (qb *FolderStore) setQuerySort(query *queryBuilder, findFilter *models.FindFilterType) error {
+	if findFilter == nil || findFilter.Sort == nil || *findFilter.Sort == "" {
+		return nil
+	}
+	sort := findFilter.GetSort("path")
+
+	// CVE-2024-32231 - ensure sort is in the list of allowed sorts
+	if err := folderSortOptions.validateSort(sort); err != nil {
+		return err
+	}
+
+	direction := findFilter.GetDirection()
+	query.sortAndPagination += getSort(sort, direction, "folders")
+
+	return nil
+}

pkg/sqlite/folder_filter.go

@@ -0,0 +1,150 @@
+package sqlite
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/stashapp/stash/pkg/models"
+)
+
+type folderFilterHandler struct {
+	folderFilter *models.FolderFilterType
+}
+
+func (qb *folderFilterHandler) validate() error {
+	folderFilter := qb.folderFilter
+	if folderFilter == nil {
+		return nil
+	}
+
+	if err := validateFilterCombination(folderFilter.OperatorFilter); err != nil {
+		return err
+	}
+
+	if subFilter := folderFilter.SubFilter(); subFilter != nil {
+		sqb := &folderFilterHandler{folderFilter: subFilter}
+		if err := sqb.validate(); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func (qb *folderFilterHandler) handle(ctx context.Context, f *filterBuilder) {
+	folderFilter := qb.folderFilter
+	if folderFilter == nil {
+		return
+	}
+
+	if err := qb.validate(); err != nil {
+		f.setError(err)
+		return
+	}
+
+	sf := folderFilter.SubFilter()
+	if sf != nil {
+		sub := &folderFilterHandler{sf}
+		handleSubFilter(ctx, sub, f, folderFilter.OperatorFilter)
+	}
+
+	f.handleCriterion(ctx, qb.criterionHandler())
+}
+
+func (qb *folderFilterHandler) criterionHandler() criterionHandler {
+	folderFilter := qb.folderFilter
+	return compoundHandler{
+		stringCriterionHandler(folderFilter.Path, "folders.path"),
+		&timestampCriterionHandler{folderFilter.ModTime, "folders.mod_time", nil},
+
+		qb.parentFolderCriterionHandler(folderFilter.ParentFolder),
+		qb.zipFileCriterionHandler(folderFilter.ZipFile),
+
+		qb.galleryCountCriterionHandler(folderFilter.GalleryCount),
+
+		&timestampCriterionHandler{folderFilter.CreatedAt, "folders.created_at", nil},
+		&timestampCriterionHandler{folderFilter.UpdatedAt, "folders.updated_at", nil},
+
+		&relatedFilterHandler{
+			relatedIDCol:   "galleries.id",
+			relatedRepo:    galleryRepository.repository,
+			relatedHandler: &galleryFilterHandler{folderFilter.GalleriesFilter},
+			joinFn: func(f *filterBuilder) {
+				folderRepository.galleries.innerJoin(f, "", "folders.id")
+			},
+		},
+	}
+}
+
+func (qb *folderFilterHandler) zipFileCriterionHandler(criterion *models.MultiCriterionInput) criterionHandlerFunc {
+	return func(ctx context.Context, f *filterBuilder) {
+		if criterion != nil {
+			if criterion.Modifier == models.CriterionModifierIsNull || criterion.Modifier == models.CriterionModifierNotNull {
+				var notClause string
+				if criterion.Modifier == models.CriterionModifierNotNull {
+					notClause = "NOT"
+				}
+
+				f.addWhere(fmt.Sprintf("folders.zip_file_id IS %s NULL", notClause))
+				return
+			}
+
+			if len(criterion.Value) == 0 {
+				return
+			}
+
+			var args []interface{}
+			for _, tagID := range criterion.Value {
+				args = append(args, tagID)
+			}
+
+			whereClause := ""
+			havingClause := ""
+			switch criterion.Modifier {
+			case models.CriterionModifierIncludes:
+				whereClause = "folders.zip_file_id IN " + getInBinding(len(criterion.Value))
+			case models.CriterionModifierExcludes:
+				whereClause = "folders.zip_file_id NOT IN " + getInBinding(len(criterion.Value))
+			}
+
+			f.addWhere(whereClause, args...)
+			f.addHaving(havingClause)
+		}
+	}
+}
+
+func (qb *folderFilterHandler) parentFolderCriterionHandler(folder *models.HierarchicalMultiCriterionInput) criterionHandlerFunc {
+	return func(ctx context.Context, f *filterBuilder) {
+		if folder == nil {
+			return
+		}
+
+		folderCopy := *folder
+		switch folderCopy.Modifier {
+		case models.CriterionModifierEquals:
+			folderCopy.Modifier = models.CriterionModifierIncludesAll
+		case models.CriterionModifierNotEquals:
+			folderCopy.Modifier = models.CriterionModifierExcludes
+		}
+
+		hh := hierarchicalMultiCriterionHandlerBuilder{
+			primaryTable: folderTable,
+			foreignTable: folderTable,
+			foreignFK:    "parent_folder_id",
+			parentFK:     "parent_folder_id",
+		}
+
+		hh.handler(&folderCopy)(ctx, f)
+	}
+}
+
+func (qb *folderFilterHandler) galleryCountCriterionHandler(galleryCount *models.IntCriterionInput) criterionHandlerFunc {
+	return func(ctx context.Context, f *filterBuilder) {
+		if galleryCount != nil {
+			f.addLeftJoin("galleries", "", "galleries.folder_id = folders.id")
+			clause, args := getIntCriterionWhereClause("count(distinct galleries.id)", *galleryCount)
+
+			f.addHaving(clause, args...)
+		}
+	}
+}

pkg/sqlite/folder_filter_test.go

@@ -0,0 +1,95 @@
+//go:build integration
+// +build integration
+
+package sqlite_test
+
+import (
+	"context"
+	"strconv"
+	"testing"
+
+	"github.com/stashapp/stash/pkg/models"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestFolderQuery(t *testing.T) {
+	tests := []struct {
+		name        string
+		findFilter  *models.FindFilterType
+		filter      *models.FolderFilterType
+		includeIdxs []int
+		includeIDs  []models.FolderID
+		excludeIdxs []int
+		wantErr     bool
+	}{
+		{
+			name: "path",
+			filter: &models.FolderFilterType{
+				Path: &models.StringCriterionInput{
+					Value:    getFolderPath(folderIdxWithSubFolder, nil),
+					Modifier: models.CriterionModifierIncludes,
+				},
+			},
+			includeIdxs: []int{folderIdxWithSubFolder, folderIdxWithParentFolder},
+			excludeIdxs: []int{folderIdxInZip},
+		},
+		{
+			name: "parent folder",
+			filter: &models.FolderFilterType{
+				ParentFolder: &models.HierarchicalMultiCriterionInput{
+					Value: []string{
+						strconv.Itoa(int(folderIDs[folderIdxWithSubFolder])),
+					},
+					Modifier: models.CriterionModifierIncludes,
+				},
+			},
+			includeIdxs: []int{folderIdxWithParentFolder},
+			excludeIdxs: []int{folderIdxWithSubFolder, folderIdxInZip},
+		},
+		{
+			name: "zip file",
+			filter: &models.FolderFilterType{
+				ZipFile: &models.MultiCriterionInput{
+					Value: []string{
+						strconv.Itoa(int(fileIDs[fileIdxZip])),
+					},
+					Modifier: models.CriterionModifierIncludes,
+				},
+			},
+			includeIdxs: []int{folderIdxInZip},
+			excludeIdxs: []int{folderIdxForObjectFiles},
+		},
+		// TODO - add more tests for other folder filters
+	}
+
+	for _, tt := range tests {
+		runWithRollbackTxn(t, tt.name, func(t *testing.T, ctx context.Context) {
+			assert := assert.New(t)
+
+			results, err := db.Folder.Query(ctx, models.FolderQueryOptions{
+				FolderFilter: tt.filter,
+				QueryOptions: models.QueryOptions{
+					FindFilter: tt.findFilter,
+				},
+			})
+			if (err != nil) != tt.wantErr {
+				t.Errorf("SceneStore.Query() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+
+			include := indexesToIDPtrs(folderIDs, tt.includeIdxs)
+			for _, id := range tt.includeIDs {
+				v := id
+				include = append(include, &v)
+			}
+			exclude := indexesToIDPtrs(folderIDs, tt.excludeIdxs)
+
+			for _, i := range include {
+				assert.Contains(results.IDs, models.FolderID(*i))
+			}
+			for _, e := range exclude {
+				assert.NotContains(results.IDs, models.FolderID(*e))
+			}
+		})
+	}
+}

pkg/sqlite/setup_test.go

@@ -578,6 +578,22 @@ func indexToID(ids []int, idx int) int {
 	return ids[idx]
 }
 
+func indexesToIDPtrs[T any](ids []T, indexes []int) []*T {
+	ret := make([]*T, len(indexes))
+	for i, idx := range indexes {
+		ret[i] = indexToIDPtr(ids, idx)
+	}
+
+	return ret
+}
+
+func indexToIDPtr[T any](ids []T, idx int) *T {
+	if idx < 0 {
+		return nil
+	}
+	return &ids[idx]
+}
+
 func indexFromID(ids []int, id int) int {
 	for i, v := range ids {
 		if v == id {
@@ -675,7 +691,9 @@ func populateDB() error {
 			return fmt.Errorf("creating files: %w", err)
 		}
 
-		// TODO - link folders to zip files
+		if err := linkFoldersToZip(ctx); err != nil {
+			return fmt.Errorf("linking folders to zip files: %w", err)
+		}
 
 		if err := createTags(ctx, db.Tag, tagsNameCase, tagsNameNoCase); err != nil {
 			return fmt.Errorf("error creating tags: %s", err.Error())
@@ -798,6 +816,27 @@ func createFolders(ctx context.Context) error {
 	return nil
 }
 
+func linkFoldersToZip(ctx context.Context) error {
+	// link folders to zip files
+	for folderIdx, fileIdx := range folderZipFiles {
+		folderID := folderIDs[folderIdx]
+		fileID := fileIDs[fileIdx]
+
+		f, err := db.Folder.Find(ctx, folderID)
+		if err != nil {
+			return fmt.Errorf("Error finding folder [%d] to link to zip file [%d]", folderID, fileID)
+		}
+
+		f.ZipFileID = &fileID
+
+		if err := db.Folder.Update(ctx, f); err != nil {
+			return fmt.Errorf("Error linking folder [%d] to zip file [%d]: %s", folderIdx, fileIdx, err.Error())
+		}
+	}
+
+	return nil
+}
+
 func getFileBaseName(index int) string {
 	return getPrefixedStringValue("file", index, "basename")
 }