first draft for removing references of declined shares

internal/grpc/services/gateway/usershareprovider.go

@@ -26,6 +26,7 @@ import (
 	rpc "github.com/cs3org/go-cs3apis/cs3/rpc/v1beta1"
 	collaboration "github.com/cs3org/go-cs3apis/cs3/sharing/collaboration/v1beta1"
 	provider "github.com/cs3org/go-cs3apis/cs3/storage/provider/v1beta1"
+	typesv1beta1 "github.com/cs3org/go-cs3apis/cs3/types/v1beta1"
 	"github.com/cs3org/reva/pkg/appctx"
 	"github.com/cs3org/reva/pkg/errtypes"
 	"github.com/cs3org/reva/pkg/rgrpc/status"
@@ -127,6 +128,8 @@ func (s *svc) RemoveShare(ctx context.Context, req *collaboration.RemoveShareReq
 		return nil, errors.Wrap(err, "gateway: error calling RemoveShare")
 	}
 
+	s.createReference(ctx, share.ResourceId, "true")
+
 	// if we don't need to commit we return earlier
 	if !s.c.CommitShareToStorageGrant && !s.c.CommitShareToStorageRef {
 		return res, nil
@@ -316,7 +319,7 @@ func (s *svc) UpdateReceivedShare(ctx context.Context, req *collaboration.Update
 			if share == nil {
 				panic("gateway: error updating a received share: the share is nil")
 			}
-			createRefStatus := s.createReference(ctx, share.Share.ResourceId)
+			createRefStatus := s.createReference(ctx, share.Share.ResourceId, "false")
 			rsp := &collaboration.UpdateReceivedShareResponse{Status: createRefStatus}
 
 			if createRefStatus.Code == rpc.Code_CODE_OK {
@@ -325,6 +328,7 @@ func (s *svc) UpdateReceivedShare(ctx context.Context, req *collaboration.Update
 			return rsp, nil
 		} else if req.Field.GetState() == collaboration.ShareState_SHARE_STATE_REJECTED {
 			// Nothing more to do, return the original result
+			s.createReference(ctx, res.Share.Share.ResourceId, "true")
 			return res, nil
 		}
 	}
@@ -336,7 +340,7 @@ func (s *svc) UpdateReceivedShare(ctx context.Context, req *collaboration.Update
 	}, nil
 }
 
-func (s *svc) createReference(ctx context.Context, resourceID *provider.ResourceId) *rpc.Status {
+func (s *svc) createReference(ctx context.Context, resourceID *provider.ResourceId, delete string) *rpc.Status {
 	ref := &provider.Reference{
 		ResourceId: resourceID,
 	}
@@ -386,6 +390,14 @@ func (s *svc) createReference(ctx context.Context, resourceID *provider.Resource
 	log.Info().Msg("mount path will be:" + refPath)
 
 	createRefReq := &provider.CreateReferenceRequest{
+		Opaque: &typesv1beta1.Opaque{
+			Map: map[string]*typesv1beta1.OpaqueEntry{
+				"delete": {
+					Decoder: "plain",
+					Value:   []byte(delete),
+				},
+			},
+		},
 		Ref: &provider.Reference{Path: refPath},
 		// cs3 is the Scheme and %s/%s is the Opaque parts of a net.URL.
 		TargetUri: fmt.Sprintf("cs3:%s/%s", resourceID.GetStorageId(), resourceID.GetOpaqueId()),

internal/grpc/services/storageprovider/storageprovider.go

@@ -1130,19 +1130,44 @@ func (s *service) RemoveGrant(ctx context.Context, req *provider.RemoveGrantRequ
 func (s *service) CreateReference(ctx context.Context, req *provider.CreateReferenceRequest) (*provider.CreateReferenceResponse, error) {
 	log := appctx.GetLogger(ctx)
 
-	// parse uri is valid
-	u, err := url.Parse(req.TargetUri)
+	newRef, err := s.unwrap(ctx, req.Ref)
 	if err != nil {
-		log.Err(err).Msg("invalid target uri")
 		return &provider.CreateReferenceResponse{
-			Status: status.NewInvalidArg(ctx, "target uri is invalid: "+err.Error()),
+			Status: status.NewInternal(ctx, err, "error unwrapping path"),
 		}, nil
 	}
 
-	newRef, err := s.unwrap(ctx, req.Ref)
+	if req.Opaque != nil {
+		opaque := req.Opaque
+		if entry, ok := opaque.Map["delete"]; ok {
+			if string(entry.Value) == "true" {
+				if err := s.storage.RemoveReference(ctx, newRef.Path); err != nil {
+					var st *rpc.Status
+					switch err.(type) {
+					case errtypes.IsNotFound:
+						st = status.NewNotFound(ctx, "path not found when creating reference")
+					case errtypes.PermissionDenied:
+						st = status.NewPermissionDenied(ctx, err, "permission denied")
+					default:
+						st = status.NewInternal(ctx, err, "error creating reference")
+					}
+					return &provider.CreateReferenceResponse{
+						Status: st,
+					}, nil
+				}
+				return &provider.CreateReferenceResponse{
+					Status: status.NewOK(ctx),
+				}, nil
+			}
+		}
+	}
+
+	// parse uri is valid
+	u, err := url.Parse(req.TargetUri)
 	if err != nil {
+		log.Err(err).Msg("invalid target uri")
 		return &provider.CreateReferenceResponse{
-			Status: status.NewInternal(ctx, err, "error unwrapping path"),
+			Status: status.NewInvalidArg(ctx, "target uri is invalid: "+err.Error()),
 		}, nil
 	}
 

internal/http/services/owncloud/ocs/handlers/apps/sharing/shares/pending.go

@@ -103,6 +103,7 @@ func (h *Handler) updateReceivedShare(w http.ResponseWriter, r *http.Request, sh
 		// Needed because received shares can be jailed in a folder in the users home
 		data.FileTarget = path.Join(h.sharePrefix, path.Base(info.Path))
 		data.Path = path.Join(h.sharePrefix, path.Base(info.Path))
+		data.StorageID = "shared::" + data.Path
 	}
 
 	response.WriteOCSSuccess(w, r, []*conversions.ShareData{data})

pkg/storage/fs/owncloud/owncloud.go

@@ -1214,6 +1214,10 @@ func (fs *ocfs) CreateReference(ctx context.Context, sp string, targetURI *url.U
 	return nil
 }
 
+func (fs *ocfs) RemoveReference(ctx context.Context, path string) error {
+	return nil
+}
+
 func (fs *ocfs) setMtime(ctx context.Context, ip string, mtime string) error {
 	log := appctx.GetLogger(ctx)
 	if mt, err := parseMTime(mtime); err == nil {

pkg/storage/fs/owncloudsql/owncloudsql.go

@@ -764,6 +764,10 @@ func (fs *owncloudsqlfs) CreateReference(ctx context.Context, sp string, targetU
 	return errtypes.NotSupported("owncloudsql: operation not supported")
 }
 
+func (fs *owncloudsqlfs) RemoveReference(ctx context.Context, path string) error {
+	return nil
+}
+
 func (fs *owncloudsqlfs) setMtime(ctx context.Context, ip string, mtime string) error {
 	log := appctx.GetLogger(ctx)
 	if mt, err := parseMTime(mtime); err == nil {

pkg/storage/fs/s3/s3.go

@@ -285,6 +285,10 @@ func (fs *s3FS) CreateReference(ctx context.Context, path string, targetURI *url
 	return errtypes.NotSupported("s3: operation not supported")
 }
 
+func (fs *s3FS) RemoveReference(ctx context.Context, path string) error {
+	return nil
+}
+
 func (fs *s3FS) GetHome(ctx context.Context) (string, error) {
 	return "", errtypes.NotSupported("eos: not supported")
 }

pkg/storage/storage.go

@@ -54,6 +54,7 @@ type FS interface {
 	ListGrants(ctx context.Context, ref *provider.Reference) ([]*provider.Grant, error)
 	GetQuota(ctx context.Context) (uint64, uint64, error)
 	CreateReference(ctx context.Context, path string, targetURI *url.URL) error
+	RemoveReference(ctx context.Context, path string) error
 	Shutdown(ctx context.Context) error
 	SetArbitraryMetadata(ctx context.Context, ref *provider.Reference, md *provider.ArbitraryMetadata) error
 	UnsetArbitraryMetadata(ctx context.Context, ref *provider.Reference, keys []string) error

pkg/storage/utils/decomposedfs/decomposedfs.go

@@ -371,6 +371,34 @@ func (fs *Decomposedfs) CreateReference(ctx context.Context, p string, targetURI
 	return nil
 }
 
+// RemoveReference removes a reference from the users home
+func (fs *Decomposedfs) RemoveReference(ctx context.Context, path string) (err error) {
+	path = strings.Trim(path, "/")
+	parts := strings.Split(path, "/")
+
+	if len(parts) != 2 {
+		return errtypes.PermissionDenied("Decomposedfs: references must be a child of the share folder: share_folder=" + fs.o.ShareFolder + " path=" + path)
+	} else if parts[0] != strings.Trim(fs.o.ShareFolder, "/") {
+		return errtypes.PermissionDenied("Decomposedfs: cannot create references outside the share folder: share_folder=" + fs.o.ShareFolder + " path=" + path)
+	}
+
+	var n *node.Node
+	if n, err = fs.lu.NodeFromPath(ctx, fs.o.ShareFolder); err != nil {
+		return errtypes.InternalError(err.Error())
+	} else if !n.Exists {
+		return nil
+	}
+
+	if n, err = n.Child(ctx, parts[1]); err != nil {
+		return errtypes.InternalError(err.Error())
+	} else if !n.Exists {
+		// TODO append increasing number to mountpoint name
+		return errtypes.NotFound(path)
+	}
+
+	return fs.tp.Delete(ctx, n)
+}
+
 // Move moves a resource from one reference to another
 func (fs *Decomposedfs) Move(ctx context.Context, oldRef, newRef *provider.Reference) (err error) {
 	var oldNode, newNode *node.Node

pkg/storage/utils/eosfs/eosfs.go

@@ -1232,6 +1232,10 @@ func (fs *eosfs) CreateReference(ctx context.Context, p string, targetURI *url.U
 	return nil
 }
 
+func (fs *eosfs) RemoveReference(ctx context.Context, path string) (err error) {
+	return nil
+}
+
 func (fs *eosfs) Delete(ctx context.Context, ref *provider.Reference) error {
 	p, err := fs.resolve(ctx, ref)
 	if err != nil {

pkg/storage/utils/localfs/localfs.go

@@ -564,6 +564,10 @@ func (fs *localfs) CreateReference(ctx context.Context, path string, targetURI *
 	return fs.propagate(ctx, fn)
 }
 
+func (fs *localfs) RemoveReference(ctx context.Context, path string) error {
+	return nil
+}
+
 func (fs *localfs) SetArbitraryMetadata(ctx context.Context, ref *provider.Reference, md *provider.ArbitraryMetadata) error {
 
 	np, err := fs.resolve(ctx, ref)