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lock-session.go
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lock-session.go
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/*
* Copyright (c) 2019-2021. Abstrium SAS <team (at) pydio.com>
* This file is part of Pydio Cells.
*
* Pydio Cells is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Pydio Cells is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with Pydio Cells. If not, see <http://www.gnu.org/licenses/>.
*
* The latest code can be found at <https://pydio.com>.
*/
package permissions
import (
"context"
"time"
"github.com/pydio/cells/v4/common/client/grpc"
"google.golang.org/protobuf/types/known/anypb"
"github.com/pydio/cells/v4/common"
"github.com/pydio/cells/v4/common/log"
"github.com/pydio/cells/v4/common/proto/idm"
service "github.com/pydio/cells/v4/common/proto/service"
"github.com/pydio/cells/v4/common/proto/tree"
)
type SessionLocker interface {
Lock(ctx context.Context) error
UpdateExpiration(ctx context.Context, expireAfter time.Duration) error
Unlock(ctx context.Context) error
AddChildTarget(parentUUID, targetChildName string)
}
type LockSession struct {
nodeUUID string
sessionUUID string
expireAfter time.Duration
targetParentUuid string
targetChildName string
}
// NewLockSession creates a new LockSession object
func NewLockSession(nodeUUID, sessionUUID string, expireAfter time.Duration) *LockSession {
return &LockSession{
nodeUUID: nodeUUID,
sessionUUID: sessionUUID,
expireAfter: expireAfter,
}
}
func (l *LockSession) AddChildTarget(parentUUID, targetChildName string) {
l.targetParentUuid = parentUUID
l.targetChildName = targetChildName
}
// Lock sets an expirable lock ACL on the NodeUUID with SessionUUID as value
func (l *LockSession) Lock(ctx context.Context) error {
aclClient := idm.NewACLServiceClient(grpc.GetClientConnFromCtx(ctx, common.ServiceAcl))
if l.nodeUUID != "" {
lock := &idm.ACLAction{Name: AclLock.Name, Value: l.sessionUUID}
if err := l.create(ctx, aclClient, l.nodeUUID, lock); err != nil {
return err
}
if err := l.updateExpiration(ctx, aclClient, l.nodeUUID, lock, l.expireAfter); err != nil {
return err
}
}
if l.targetParentUuid != "" && l.targetChildName != "" {
childLock := &idm.ACLAction{Name: AclChildLock.Name + ":" + l.targetChildName, Value: l.sessionUUID}
if err := l.create(ctx, aclClient, l.targetParentUuid, childLock); err != nil {
return err
}
if err := l.updateExpiration(ctx, aclClient, l.targetParentUuid, childLock, l.expireAfter); err != nil {
return err
}
}
return nil
}
// UpdateExpiration set a new expiration date on the current lock
func (l *LockSession) UpdateExpiration(ctx context.Context, expireAfter time.Duration) error {
aclClient := idm.NewACLServiceClient(grpc.GetClientConnFromCtx(ctx, common.ServiceAcl))
if l.nodeUUID != "" {
searchLock := &idm.ACLAction{Name: AclLock.Name, Value: l.sessionUUID}
if err := l.updateExpiration(ctx, aclClient, l.nodeUUID, searchLock, expireAfter); err != nil {
return err
}
}
if l.targetParentUuid != "" && l.targetChildName != "" {
childLock := &idm.ACLAction{Name: AclChildLock.Name + ":" + l.targetChildName, Value: l.sessionUUID}
return l.updateExpiration(ctx, aclClient, l.targetParentUuid, childLock, expireAfter)
}
return nil
}
// Unlock manually removes the ACL
func (l *LockSession) Unlock(ctx context.Context) error {
aclClient := idm.NewACLServiceClient(grpc.GetClientConnFromCtx(ctx, common.ServiceAcl))
err1 := l.remove(ctx, aclClient, &idm.ACLAction{Name: AclLock.Name, Value: l.sessionUUID})
err2 := l.remove(ctx, aclClient, &idm.ACLAction{Name: AclChildLock.Name + ":*", Value: l.sessionUUID})
if err1 != nil {
return err1
} else if err2 != nil {
return err1
} else {
return nil
}
}
func (l *LockSession) create(ctx context.Context, cli idm.ACLServiceClient, nodeUUID string, action *idm.ACLAction) error {
_, err := cli.CreateACL(ctx, &idm.CreateACLRequest{
ACL: &idm.ACL{
NodeID: nodeUUID,
Action: action,
},
})
return err
}
func (l *LockSession) remove(ctx context.Context, cli idm.ACLServiceClient, action *idm.ACLAction) error {
q, _ := anypb.New(&idm.ACLSingleQuery{
Actions: []*idm.ACLAction{action},
})
_, err := cli.DeleteACL(ctx, &idm.DeleteACLRequest{
Query: &service.Query{
SubQueries: []*anypb.Any{q},
},
})
return err
}
func (l *LockSession) updateExpiration(ctx context.Context, cli idm.ACLServiceClient, nodeUUID string, action *idm.ACLAction, expireAfter time.Duration) error {
q, _ := anypb.New(&idm.ACLSingleQuery{
Actions: []*idm.ACLAction{action},
NodeIDs: []string{nodeUUID},
})
_, err := cli.ExpireACL(ctx, &idm.ExpireACLRequest{
Query: &service.Query{
SubQueries: []*anypb.Any{q},
},
Timestamp: time.Now().Add(expireAfter).Unix(),
})
return err
}
func HasChildLocks(ctx context.Context, node *tree.Node) bool {
aclClient := idm.NewACLServiceClient(grpc.GetClientConnFromCtx(ctx, common.ServiceAcl))
q, _ := anypb.New(&idm.ACLSingleQuery{
Actions: []*idm.ACLAction{{Name: AclChildLock.Name + ":*"}},
NodeIDs: []string{node.GetUuid()},
})
if st, e := aclClient.SearchACL(ctx, &idm.SearchACLRequest{Query: &service.Query{SubQueries: []*anypb.Any{q}}}); e == nil {
defer st.CloseSend()
for {
_, er := st.Recv()
if er != nil {
break
}
log.Logger(ctx).Info("Found childLock on ", node.Zap())
return true
}
}
log.Logger(ctx).Debug("No childLock on ", node.Zap())
return false
}