add more functions to the utils package

Signed-off-by: jkoberg <jkoberg@owncloud.com>

changelog/unreleased/improve-utils.md

@@ -0,0 +1,5 @@
+Enhancement: Improve utils pkg
+
+Add more function to utils pkg so they don't need to be copy/pasted everywhere
+
+https://github.com/cs3org/reva/pull/4160

pkg/utils/grpc.go

@@ -2,27 +2,30 @@ package utils
 
 import (
 	"context"
+	"encoding/json"
+	"errors"
 	"fmt"
 
 	gateway "github.com/cs3org/go-cs3apis/cs3/gateway/v1beta1"
+	group "github.com/cs3org/go-cs3apis/cs3/identity/group/v1beta1"
 	user "github.com/cs3org/go-cs3apis/cs3/identity/user/v1beta1"
 	rpc "github.com/cs3org/go-cs3apis/cs3/rpc/v1beta1"
+	storageprovider "github.com/cs3org/go-cs3apis/cs3/storage/provider/v1beta1"
 	revactx "github.com/cs3org/reva/v2/pkg/ctx"
+
 	"google.golang.org/grpc/metadata"
 )
 
-// GetUser gets the specified user
-func GetUser(userID *user.UserId, gwc gateway.GatewayAPIClient) (*user.User, error) {
-	getUserResponse, err := gwc.GetUser(context.Background(), &user.GetUserRequest{UserId: userID})
-	if err != nil {
-		return nil, err
-	}
-	if getUserResponse.Status.Code != rpc.Code_CODE_OK {
-		return nil, fmt.Errorf("error getting user: %s", getUserResponse.Status.Message)
-	}
+// SpaceRole defines the user role on space
+type SpaceRole func(*storageprovider.ResourcePermissions) bool
 
-	return getUserResponse.GetUser(), nil
-}
+// Possible roles in spaces
+var (
+	AllRole     SpaceRole = func(perms *storageprovider.ResourcePermissions) bool { return true }
+	ViewerRole  SpaceRole = func(perms *storageprovider.ResourcePermissions) bool { return perms.Stat }
+	EditorRole  SpaceRole = func(perms *storageprovider.ResourcePermissions) bool { return perms.InitiateFileUpload }
+	ManagerRole SpaceRole = func(perms *storageprovider.ResourcePermissions) bool { return perms.DenyGrant }
+)
 
 // GetServiceUserContext returns an authenticated context of the given service user
 func GetServiceUserContext(serviceUserID string, gwc gateway.GatewayAPIClient, serviceUserSecret string) (context.Context, error) {
@@ -41,3 +44,174 @@ func GetServiceUserContext(serviceUserID string, gwc gateway.GatewayAPIClient, s
 
 	return metadata.AppendToOutgoingContext(ctx, revactx.TokenHeader, authRes.Token), nil
 }
+
+// GetUser gets the specified user
+func GetUser(userID *user.UserId, gwc gateway.GatewayAPIClient) (*user.User, error) {
+	getUserResponse, err := gwc.GetUser(context.Background(), &user.GetUserRequest{UserId: userID})
+	if err != nil {
+		return nil, err
+	}
+	if getUserResponse.Status.Code != rpc.Code_CODE_OK {
+		return nil, fmt.Errorf("error getting user: %s", getUserResponse.Status.Message)
+	}
+
+	return getUserResponse.GetUser(), nil
+}
+
+// GetSpace returns the given space
+func GetSpace(ctx context.Context, spaceID string, gwc gateway.GatewayAPIClient) (*storageprovider.StorageSpace, error) {
+	res, err := gwc.ListStorageSpaces(ctx, listStorageSpaceRequest(spaceID))
+	if err != nil {
+		return nil, err
+	}
+
+	if res.GetStatus().GetCode() != rpc.Code_CODE_OK {
+		return nil, fmt.Errorf("error while getting space: (%v) %s", res.GetStatus().GetCode(), res.GetStatus().GetMessage())
+	}
+
+	if len(res.StorageSpaces) == 0 {
+		return nil, fmt.Errorf("error getting storage space %s: no space returned", spaceID)
+	}
+
+	return res.StorageSpaces[0], nil
+}
+
+// GetGroupMembers returns all members of the given group
+func GetGroupMembers(ctx context.Context, groupID string, gwc gateway.GatewayAPIClient) ([]string, error) {
+	r, err := gwc.GetGroup(ctx, &group.GetGroupRequest{GroupId: &group.GroupId{OpaqueId: groupID}})
+	if err != nil {
+		return nil, err
+	}
+
+	if r.GetStatus().GetCode() != rpc.Code_CODE_OK {
+		return nil, fmt.Errorf("unexpected status code from gateway client: %d", r.GetStatus().GetCode())
+	}
+
+	var usrs []string
+	for _, u := range r.GetGroup().GetMembers() {
+		usrs = append(usrs, u.GetOpaqueId())
+	}
+
+	return usrs, nil
+}
+
+// ResolveID returns either the given userID or all members of the given groupID (if userID is nil)
+func ResolveID(ctx context.Context, userid *user.UserId, groupid *group.GroupId, gwc gateway.GatewayAPIClient) ([]string, error) {
+	if userid != nil {
+		return []string{userid.GetOpaqueId()}, nil
+	}
+
+	if ctx == nil {
+		return nil, errors.New("need ctx to resolve group id")
+	}
+
+	return GetGroupMembers(ctx, groupid.GetOpaqueId(), gwc)
+}
+
+// GetSpaceMembers returns all members of the given space that have at least the given role. `nil` role will be interpreted as all
+func GetSpaceMembers(ctx context.Context, spaceID string, gwc gateway.GatewayAPIClient, role SpaceRole) ([]string, error) {
+	if ctx == nil {
+		return nil, errors.New("need authenticated context to find space members")
+	}
+
+	space, err := GetSpace(ctx, spaceID, gwc)
+	if err != nil {
+		return nil, err
+	}
+
+	var users []string
+	switch space.SpaceType {
+	case "personal":
+		users = append(users, space.GetOwner().GetId().GetOpaqueId())
+	case "project":
+		if users, err = gatherProjectSpaceMembers(ctx, space, gwc, role); err != nil {
+			return nil, err
+		}
+	default:
+		// TODO: shares? other space types?
+		return nil, fmt.Errorf("unsupported space type: %s", space.SpaceType)
+	}
+
+	return users, nil
+}
+
+// GetResourceByID is a convenience method to get a resource by its resourceID
+func GetResourceByID(ctx context.Context, resourceid *storageprovider.ResourceId, gwc gateway.GatewayAPIClient) (*storageprovider.ResourceInfo, error) {
+	return GetResource(ctx, &storageprovider.Reference{ResourceId: resourceid}, gwc)
+}
+
+// GetResource returns a resource by reference
+func GetResource(ctx context.Context, ref *storageprovider.Reference, gwc gateway.GatewayAPIClient) (*storageprovider.ResourceInfo, error) {
+	res, err := gwc.Stat(ctx, &storageprovider.StatRequest{Ref: ref})
+	if err != nil {
+		return nil, err
+	}
+
+	if res.GetStatus().GetCode() != rpc.Code_CODE_OK {
+		return nil, fmt.Errorf("unexpected status code while getting space: %v", res.GetStatus().GetCode())
+	}
+
+	return res.GetInfo(), nil
+}
+
+func gatherProjectSpaceMembers(ctx context.Context, space *storageprovider.StorageSpace, gwc gateway.GatewayAPIClient, role SpaceRole) ([]string, error) {
+	var permissionsMap map[string]*storageprovider.ResourcePermissions
+	if err := ReadJSONFromOpaque(space.GetOpaque(), "grants", &permissionsMap); err != nil {
+		return nil, err
+	}
+
+	groupsMap := make(map[string]struct{})
+	if opaqueGroups, ok := space.Opaque.Map["groups"]; ok {
+		_ = json.Unmarshal(opaqueGroups.GetValue(), &groupsMap)
+	}
+
+	if role == nil {
+		role = AllRole
+	}
+
+	// we use a map to avoid duplicates
+	usermap := make(map[string]struct{})
+	for id, perm := range permissionsMap {
+		if !role(perm) {
+			continue
+		}
+
+		if _, isGroup := groupsMap[id]; !isGroup {
+			usermap[id] = struct{}{}
+			continue
+		}
+
+		usrs, err := GetGroupMembers(ctx, id, gwc)
+		if err != nil {
+			// TODO: continue?
+			return nil, err
+		}
+
+		for _, u := range usrs {
+			usermap[u] = struct{}{}
+		}
+	}
+
+	var users []string
+	for id := range usermap {
+		users = append(users, id)
+	}
+
+	return users, nil
+}
+
+func listStorageSpaceRequest(spaceID string) *storageprovider.ListStorageSpacesRequest {
+	return &storageprovider.ListStorageSpacesRequest{
+		Opaque: AppendPlainToOpaque(nil, "unrestricted", "true"),
+		Filters: []*storageprovider.ListStorageSpacesRequest_Filter{
+			{
+				Type: storageprovider.ListStorageSpacesRequest_Filter_TYPE_ID,
+				Term: &storageprovider.ListStorageSpacesRequest_Filter_Id{
+					Id: &storageprovider.StorageSpaceId{
+						OpaqueId: spaceID,
+					},
+				},
+			},
+		},
+	}
+}