storage

type ComposableFS interface {
	UseIn(composer *tusd.StoreComposer)
}

type FS interface {

	// Shutdown is called when the process is exiting to give the driver a chance to flush and close all open handles
	Shutdown(ctx context.Context) error

	// ListStorageSpaces lists the spaces in the storage.
	// FIXME The unrestricted parameter is an implementation detail of decomposedfs, remove it from the function?
	ListStorageSpaces(ctx context.Context, filter []*provider.ListStorageSpacesRequest_Filter, unrestricted bool) ([]*provider.StorageSpace, error)

	// GetQuota returns the quota on the referenced resource
	GetQuota(ctx context.Context, ref *provider.Reference) (uint64, uint64, uint64, error)

	// GetMD returns the resuorce info for the referenced resource
	GetMD(ctx context.Context, ref *provider.Reference, mdKeys, fieldMask []string) (*provider.ResourceInfo, error)
	// ListFolder returns the resource infos for all children of the referenced resource
	ListFolder(ctx context.Context, ref *provider.Reference, mdKeys, fieldMask []string) ([]*provider.ResourceInfo, error)
	// Download returns a ReadCloser for the content of the referenced resource
	Download(ctx context.Context, ref *provider.Reference) (io.ReadCloser, error)

	// GetPathByID returns the path for the given resource id relative to the space root
	// It should only reveal the path visible to the current user to not leak the names uf unshared parent resources
	// FIXME should be deprecated in favor of calls to GetMD and the fieldmask 'path'
	GetPathByID(ctx context.Context, id *provider.ResourceId) (string, error)

	// CreateReference creates a resource of type reference
	CreateReference(ctx context.Context, path string, targetURI *url.URL) error
	// CreateDir creates a resource of type container
	CreateDir(ctx context.Context, ref *provider.Reference) error
	// TouchFile sets the mtime of a resource, creating an empty file if it does not exist
	// FIXME the markprocessing flag is an implementation detail of decomposedfs, remove it from the function
	// FIXME the mtime should either be a time.Time or a CS3 Timestamp, not a string
	TouchFile(ctx context.Context, ref *provider.Reference, markprocessing bool, mtime string) error
	// Delete deletes a resource.
	// If the storage driver supports a recycle bin it should moves it to the recycle bin
	Delete(ctx context.Context, ref *provider.Reference) error
	// Move changes the path of a resource
	Move(ctx context.Context, oldRef, newRef *provider.Reference) error
	// InitiateUpload returns a list of protocols with urls that can be used to append bytes to a new upload session
	InitiateUpload(ctx context.Context, ref *provider.Reference, uploadLength int64, metadata map[string]string) (map[string]string, error)
	// Upload creates or updates a resource of type file with a new revision
	Upload(ctx context.Context, req UploadRequest, uploadFunc UploadFinishedFunc) (*provider.ResourceInfo, error)

	// ListRevisions lists all revisions for the referenced resource
	ListRevisions(ctx context.Context, ref *provider.Reference) ([]*provider.FileVersion, error)
	// DownloadRevision downloads a revision
	DownloadRevision(ctx context.Context, ref *provider.Reference, key string) (io.ReadCloser, error)
	// RestoreRevision restores a revision
	RestoreRevision(ctx context.Context, ref *provider.Reference, key string) error

	// ListRecycle lists the content of the recycle bin
	ListRecycle(ctx context.Context, ref *provider.Reference, key, relativePath string) ([]*provider.RecycleItem, error)
	// RestoreRecycleItem restores an item from the recyle bin
	// if restoreRef is nil the resource should be restored at the original path
	RestoreRecycleItem(ctx context.Context, ref *provider.Reference, key, relativePath string, restoreRef *provider.Reference) error
	// PurgeRecycleItem removes a resource from the recycle bin
	PurgeRecycleItem(ctx context.Context, ref *provider.Reference, key, relativePath string) error
	// EmptyRecycle removes all resource from the recycle bin
	EmptyRecycle(ctx context.Context, ref *provider.Reference) error

	// AddGrant adds a grant to a resource
	AddGrant(ctx context.Context, ref *provider.Reference, g *provider.Grant) error
	// DenyGrant marks a resource as denied for a recipient
	// The resource and its children must be completely hidden for the recipient
	DenyGrant(ctx context.Context, ref *provider.Reference, g *provider.Grantee) error
	// RemoveGrant removes a grant from a resource
	RemoveGrant(ctx context.Context, ref *provider.Reference, g *provider.Grant) error
	// UpdateGrant updates a grant on a resource
	UpdateGrant(ctx context.Context, ref *provider.Reference, g *provider.Grant) error
	// ListGrants lists all grants on a resource
	ListGrants(ctx context.Context, ref *provider.Reference) ([]*provider.Grant, error)

	// SetArbitraryMetadata sets arbitraty metadata on a resource
	SetArbitraryMetadata(ctx context.Context, ref *provider.Reference, md *provider.ArbitraryMetadata) error
	// UnsetArbitraryMetadata removes arbitraty metadata from a resource
	UnsetArbitraryMetadata(ctx context.Context, ref *provider.Reference, keys []string) error

	// GetLock returns an existing lock on the given reference
	GetLock(ctx context.Context, ref *provider.Reference) (*provider.Lock, error)
	// SetLock puts a lock on the given reference
	SetLock(ctx context.Context, ref *provider.Reference, lock *provider.Lock) error
	// RefreshLock refreshes an existing lock on the given reference
	RefreshLock(ctx context.Context, ref *provider.Reference, lock *provider.Lock, existingLockID string) error
	// Unlock removes an existing lock from the given reference
	Unlock(ctx context.Context, ref *provider.Reference, lock *provider.Lock) error

	// CreateStorageSpace creates a storage space
	CreateStorageSpace(ctx context.Context, req *provider.CreateStorageSpaceRequest) (*provider.CreateStorageSpaceResponse, error)
	// UpdateStorageSpace updates a storage space
	UpdateStorageSpace(ctx context.Context, req *provider.UpdateStorageSpaceRequest) (*provider.UpdateStorageSpaceResponse, error)
	// DeleteStorageSpace deletes a storage space
	DeleteStorageSpace(ctx context.Context, req *provider.DeleteStorageSpaceRequest) error

	// CreateHome creates a users home
	// Deprecated: use CreateStorageSpace with type personal
	CreateHome(ctx context.Context) error
	// GetHome returns the path to the users home
	// Deprecated: use ListStorageSpaces with type personal
	GetHome(ctx context.Context) (string, error)
}

type PathWrapper interface {
	Unwrap(ctx context.Context, rp string) (string, error)
	Wrap(ctx context.Context, rp string) (string, error)
}

type Registry interface {
	// GetProvider returns the Address of the storage provider that should be used for the given space.
	// Use it to determine where to create a new storage space.
	GetProvider(ctx context.Context, space *provider.StorageSpace) (*registry.ProviderInfo, error)
	// ListProviders returns the storage providers that match the given filter
	ListProviders(ctx context.Context, filters map[string]string) ([]*registry.ProviderInfo, error)
}

type UnscopeFunc func()

type UploadFinishedFunc func(spaceOwner, executant *userpb.UserId, ref *provider.Reference)

type UploadRequest struct {
	Ref    *provider.Reference
	Body   io.ReadCloser
	Length int64
}

type UploadSession interface {
	// ID returns the upload id
	ID() string
	// Filename returns the filename of the file
	Filename() string
	// Size returns the size of the upload
	Size() int64
	// Offset returns the current offset
	Offset() int64
	// Reference returns a reference for the file being uploaded. May be absolute id based or relative to e.g. a space root
	Reference() provider.Reference
	// Executant returns the userid of the user that created the upload
	Executant() userpb.UserId
	// SpaceOwner returns the owner of a space if set. optional
	SpaceOwner() *userpb.UserId
	// Expires returns the time when the upload can no longer be used
	Expires() time.Time

	// IsProcessing returns true if postprocessing has not finished, yet
	// The actual postprocessing state is tracked in the postprocessing service.
	IsProcessing() bool

	// Purge allows completely removing an upload. Should emit a PostprocessingFinished event with a Delete outcome
	Purge(ctx context.Context) error

	// ScanData returns the scan data for the UploadSession
	ScanData() (string, time.Time)
}

type UploadSessionFilter struct {
	ID         *string
	Processing *bool
	Expired    *bool
	HasVirus   *bool
}

type UploadSessionLister interface {
	// ListUploadSessions returns the upload sessions matching the given filter
	ListUploadSessions(ctx context.Context, filter UploadSessionFilter) ([]UploadSession, error)
}

type UploadsManager interface {
	ListUploads() ([]tusd.FileInfo, error)
	PurgeExpiredUploads(chan<- tusd.FileInfo) error
}