feat: impl upload service

apps/backend/internal/upload/err.go

@@ -0,0 +1,9 @@
+package upload
+
+import "errors"
+
+var (
+	ErrNotFound           = errors.New("not found")
+	ErrParentNotDirectory = errors.New("parent is not a directory")
+	ErrConflict           = errors.New("node conflict")
+)

apps/backend/internal/upload/service.go

@@ -0,0 +1,141 @@
+package upload
+
+import (
+	"context"
+	"errors"
+	"io"
+	"sync"
+	"time"
+
+	"github.com/get-drexa/drexa/internal/blob"
+	"github.com/get-drexa/drexa/internal/virtualfs"
+	"github.com/google/uuid"
+)
+
+type Service struct {
+	vfs       *virtualfs.VirtualFS
+	blobStore blob.Store
+
+	pendingUploads sync.Map
+}
+
+func NewService(vfs *virtualfs.VirtualFS, blobStore blob.Store) *Service {
+	return &Service{
+		vfs:       vfs,
+		blobStore: blobStore,
+
+		pendingUploads: sync.Map{},
+	}
+}
+
+type CreateUploadOptions struct {
+	ParentID string
+	Name     string
+}
+
+type Upload struct {
+	ID         string
+	TargetNode *virtualfs.Node
+	UploadURL  string
+}
+
+type CreateUploadResult struct {
+	UploadID  string
+	UploadURL string
+}
+
+func (s *Service) CreateUpload(ctx context.Context, userID uuid.UUID, opts CreateUploadOptions) (*Upload, error) {
+	parentNode, err := s.vfs.FindNodeByPublicID(ctx, userID, opts.ParentID)
+	if err != nil {
+		if errors.Is(err, virtualfs.ErrNodeNotFound) {
+			return nil, ErrNotFound
+		}
+		return nil, err
+	}
+
+	if parentNode.Kind != virtualfs.NodeKindDirectory {
+		return nil, ErrParentNotDirectory
+	}
+
+	node, err := s.vfs.CreateFile(ctx, userID, virtualfs.CreateFileOptions{
+		ParentID: parentNode.ID,
+		Name:     opts.Name,
+	})
+	if err != nil {
+		if errors.Is(err, virtualfs.ErrNodeConflict) {
+			return nil, ErrConflict
+		}
+		return nil, err
+	}
+
+	uploadURL, err := s.blobStore.GenerateUploadURL(ctx, node.BlobKey, blob.UploadURLOptions{
+		Duration: 1 * time.Hour,
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	upload := &Upload{
+		ID:         node.PublicID,
+		TargetNode: node,
+		UploadURL:  uploadURL,
+	}
+
+	s.pendingUploads.Store(upload.ID, upload)
+
+	return upload, nil
+}
+
+func (s *Service) ReceiveUpload(ctx context.Context, userID uuid.UUID, uploadID string, reader io.Reader) error {
+	n, ok := s.pendingUploads.Load(uploadID)
+	if !ok {
+		return ErrNotFound
+	}
+
+	upload, ok := n.(*Upload)
+	if !ok {
+		return ErrNotFound
+	}
+
+	if upload.TargetNode.UserID != userID {
+		return ErrNotFound
+	}
+
+	err := s.vfs.WriteFile(ctx, upload.TargetNode, virtualfs.FileContentFromReader(reader))
+	if err != nil {
+		return err
+	}
+
+	s.pendingUploads.Delete(uploadID)
+
+	return nil
+}
+
+func (s *Service) CompleteUpload(ctx context.Context, userID uuid.UUID, uploadID string) error {
+	n, ok := s.pendingUploads.Load(uploadID)
+	if !ok {
+		return ErrNotFound
+	}
+
+	upload, ok := n.(*Upload)
+	if !ok {
+		return ErrNotFound
+	}
+
+	if upload.TargetNode.UserID != userID {
+		return ErrNotFound
+	}
+
+	if upload.TargetNode.Status == virtualfs.NodeStatusReady {
+		return nil
+	}
+
+	err := s.vfs.WriteFile(ctx, upload.TargetNode, virtualfs.FileContentFromBlobKey(upload.TargetNode.BlobKey))
+	if err != nil {
+		return err
+	}
+
+	s.pendingUploads.Delete(uploadID)
+
+	return nil
+}