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json.go
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/
json.go
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// Copyright 2018-2024 CERN
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// In applying this license, CERN does not waive the privileges and immunities
// granted to it by virtue of its status as an Intergovernmental Organization
// or submit itself to any jurisdiction.
package json
import (
"context"
"encoding/json"
"io"
"os"
"sync"
"time"
userpb "github.com/cs3org/go-cs3apis/cs3/identity/user/v1beta1"
ocm "github.com/cs3org/go-cs3apis/cs3/sharing/ocm/v1beta1"
provider "github.com/cs3org/go-cs3apis/cs3/storage/provider/v1beta1"
typespb "github.com/cs3org/go-cs3apis/cs3/types/v1beta1"
"github.com/cs3org/reva/pkg/errtypes"
"github.com/cs3org/reva/pkg/ocm/share"
"github.com/cs3org/reva/pkg/ocm/share/repository/registry"
"github.com/cs3org/reva/pkg/utils"
"github.com/cs3org/reva/pkg/utils/cfg"
"github.com/google/uuid"
"github.com/pkg/errors"
"google.golang.org/genproto/protobuf/field_mask"
)
func init() {
registry.Register("json", New)
}
// New returns a new authorizer object.
func New(ctx context.Context, m map[string]interface{}) (share.Repository, error) {
var c config
if err := cfg.Decode(m, &c); err != nil {
return nil, err
}
// load or create file
model, err := loadOrCreate(c.File)
if err != nil {
err = errors.Wrap(err, "error loading the file containing the shares")
return nil, err
}
mgr := &mgr{
c: &c,
model: model,
}
return mgr, nil
}
func loadOrCreate(file string) (*shareModel, error) {
_, err := os.Stat(file)
if os.IsNotExist(err) {
if err := os.WriteFile(file, []byte("{}"), 0700); err != nil {
return nil, errors.Wrap(err, "error creating the file: "+file)
}
}
f, err := os.OpenFile(file, os.O_RDONLY, 0644)
if err != nil {
err = errors.Wrap(err, "error opening the file: "+file)
return nil, err
}
defer f.Close()
var m shareModel
if err := json.NewDecoder(f).Decode(&m); err != nil {
if err != io.EOF {
return nil, errors.Wrap(err, "error decoding data to json")
}
}
if m.Shares == nil {
m.Shares = map[string]*ocm.Share{}
}
if m.ReceivedShares == nil {
m.ReceivedShares = map[string]*ocm.ReceivedShare{}
}
return &m, nil
}
type shareModel struct {
Shares map[string]*ocm.Share `json:"shares"` // share_id -> share
ReceivedShares map[string]*ocm.ReceivedShare `json:"received_shares"` // share_id -> share
}
func (s *shareModel) UnmarshalJSON(d []byte) error {
m := struct {
Shares map[string]json.RawMessage `json:"shares"`
ReceivedShares map[string]json.RawMessage `json:"received_shares"`
}{}
if err := json.Unmarshal(d, &m); err != nil {
return err
}
share := map[string]*ocm.Share{}
for k, v := range m.Shares {
var s ocm.Share
if err := utils.UnmarshalJSONToProtoV1(v, &s); err != nil {
return err
}
share[k] = &s
}
received := map[string]*ocm.ReceivedShare{}
for k, v := range m.ReceivedShares {
var s ocm.ReceivedShare
if err := utils.UnmarshalJSONToProtoV1(v, &s); err != nil {
return err
}
received[k] = &s
}
*s = shareModel{
Shares: share,
ReceivedShares: received,
}
return nil
}
func (s *shareModel) MarshalJSON() ([]byte, error) {
shares := map[string]json.RawMessage{}
for k, v := range s.Shares {
d, err := utils.MarshalProtoV1ToJSON(v)
if err != nil {
return nil, err
}
shares[k] = d
}
received := map[string]json.RawMessage{}
for k, v := range s.ReceivedShares {
d, err := utils.MarshalProtoV1ToJSON(v)
if err != nil {
return nil, err
}
received[k] = d
}
return json.Marshal(map[string]any{
"shares": shares,
"received_shares": received,
})
}
type config struct {
File string `mapstructure:"file"`
}
func (c *config) ApplyDefaults() {
if c.File == "" {
c.File = "/var/tmp/reva/ocm-shares.json"
}
}
type mgr struct {
c *config
sync.Mutex // concurrent access to the file
model *shareModel
}
func (m *mgr) save() error {
f, err := os.OpenFile(m.c.File, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
if err != nil {
return errors.Wrap(err, "error opening file "+m.c.File)
}
defer f.Close()
if err := json.NewEncoder(f).Encode(m.model); err != nil {
return errors.Wrap(err, "error encoding to json")
}
return f.Sync()
}
func (m *mgr) load() error {
f, err := os.OpenFile(m.c.File, os.O_RDONLY, 0644)
if err != nil {
return errors.Wrap(err, "error opening file "+m.c.File)
}
defer f.Close()
d, err := io.ReadAll(f)
if err != nil {
return err
}
var model shareModel
if err := json.Unmarshal(d, &model); err != nil {
return err
}
m.model = &model
return nil
}
func genID() string {
return uuid.New().String()
}
func (m *mgr) StoreShare(ctx context.Context, ocmshare *ocm.Share) (*ocm.Share, error) {
m.Lock()
defer m.Unlock()
if err := m.load(); err != nil {
return nil, err
}
if _, err := m.getByKey(ctx, &ocm.ShareKey{
Owner: ocmshare.Owner,
ResourceId: ocmshare.ResourceId,
Grantee: ocmshare.Grantee,
}); err == nil {
return nil, share.ErrShareAlreadyExisting
}
ocmshare.Id = &ocm.ShareId{OpaqueId: genID()}
m.model.Shares[ocmshare.Id.OpaqueId] = cloneShare(ocmshare)
if err := m.save(); err != nil {
return nil, errors.Wrap(err, "error saving share")
}
return ocmshare, nil
}
func cloneShare(s *ocm.Share) *ocm.Share {
d, err := utils.MarshalProtoV1ToJSON(s)
if err != nil {
panic(err)
}
var cloned ocm.Share
if err := utils.UnmarshalJSONToProtoV1(d, &cloned); err != nil {
panic(err)
}
return &cloned
}
func cloneReceivedShare(s *ocm.ReceivedShare) *ocm.ReceivedShare {
d, err := utils.MarshalProtoV1ToJSON(s)
if err != nil {
panic(err)
}
var cloned ocm.ReceivedShare
if err := utils.UnmarshalJSONToProtoV1(d, &cloned); err != nil {
panic(err)
}
return &cloned
}
func (m *mgr) GetShare(ctx context.Context, user *userpb.User, ref *ocm.ShareReference) (*ocm.Share, error) {
m.Lock()
defer m.Unlock()
var (
s *ocm.Share
err error
)
if err := m.load(); err != nil {
return nil, err
}
switch {
case ref.GetId() != nil:
s, err = m.getByID(ctx, ref.GetId())
case ref.GetKey() != nil:
s, err = m.getByKey(ctx, ref.GetKey())
case ref.GetToken() != "":
return m.getByToken(ctx, ref.GetToken())
default:
err = errtypes.NotFound(ref.String())
}
if err != nil {
return nil, err
}
// check if we are the owner
if utils.UserEqual(user.Id, s.Owner) || utils.UserEqual(user.Id, s.Creator) {
return s, nil
}
return nil, share.ErrShareNotFound
}
func (m *mgr) getByToken(ctx context.Context, token string) (*ocm.Share, error) {
for _, share := range m.model.Shares {
if share.Token == token {
return share, nil
}
}
return nil, errtypes.NotFound(token)
}
func (m *mgr) getByID(ctx context.Context, id *ocm.ShareId) (*ocm.Share, error) {
if share, ok := m.model.Shares[id.OpaqueId]; ok {
return share, nil
}
return nil, errtypes.NotFound(id.String())
}
func (m *mgr) getByKey(ctx context.Context, key *ocm.ShareKey) (*ocm.Share, error) {
for _, share := range m.model.Shares {
if (utils.UserEqual(key.Owner, share.Owner) || utils.UserEqual(key.Owner, share.Creator)) &&
utils.ResourceIDEqual(key.ResourceId, share.ResourceId) && utils.GranteeEqual(key.Grantee, share.Grantee) {
return share, nil
}
}
return nil, share.ErrShareNotFound
}
func (m *mgr) DeleteShare(ctx context.Context, user *userpb.User, ref *ocm.ShareReference) error {
m.Lock()
defer m.Unlock()
if err := m.load(); err != nil {
return err
}
for id, share := range m.model.Shares {
if sharesEqual(ref, share) {
if utils.UserEqual(user.Id, share.Owner) || utils.UserEqual(user.Id, share.Creator) {
delete(m.model.Shares, id)
return m.save()
}
}
}
return errtypes.NotFound(ref.String())
}
func sharesEqual(ref *ocm.ShareReference, s *ocm.Share) bool {
if ref.GetId() != nil && s.Id != nil {
if ref.GetId().OpaqueId == s.Id.OpaqueId {
return true
}
} else if ref.GetKey() != nil {
if (utils.UserEqual(ref.GetKey().Owner, s.Owner) || utils.UserEqual(ref.GetKey().Owner, s.Creator)) &&
utils.ResourceIDEqual(ref.GetKey().ResourceId, s.ResourceId) && utils.GranteeEqual(ref.GetKey().Grantee, s.Grantee) {
return true
}
}
return false
}
func receivedShareEqual(ref *ocm.ShareReference, s *ocm.ReceivedShare) bool {
if ref.GetId() != nil && s.Id != nil {
if ref.GetId().OpaqueId == s.Id.OpaqueId {
return true
}
}
return false
}
func (m *mgr) UpdateShare(ctx context.Context, user *userpb.User, ref *ocm.ShareReference, f ...*ocm.UpdateOCMShareRequest_UpdateField) (*ocm.Share, error) {
return nil, errtypes.NotSupported("not yet implemented")
}
func (m *mgr) ListShares(ctx context.Context, user *userpb.User, filters []*ocm.ListOCMSharesRequest_Filter) ([]*ocm.Share, error) {
var ss []*ocm.Share
m.Lock()
defer m.Unlock()
if err := m.load(); err != nil {
return nil, err
}
for _, share := range m.model.Shares {
if utils.UserEqual(user.Id, share.Owner) || utils.UserEqual(user.Id, share.Creator) {
// no filter we return earlier
if len(filters) == 0 {
ss = append(ss, share)
} else {
// check filters
// TODO(labkode): add the rest of filters.
for _, f := range filters {
if f.Type == ocm.ListOCMSharesRequest_Filter_TYPE_RESOURCE_ID {
if utils.ResourceIDEqual(share.ResourceId, f.GetResourceId()) {
ss = append(ss, share)
}
}
}
}
}
}
return ss, nil
}
func (m *mgr) StoreReceivedShare(ctx context.Context, share *ocm.ReceivedShare) (*ocm.ReceivedShare, error) {
m.Lock()
defer m.Unlock()
if err := m.load(); err != nil {
return nil, err
}
now := time.Now().UnixNano()
ts := &typespb.Timestamp{
Seconds: uint64(now / 1000000000),
Nanos: uint32(now % 1000000000),
}
share.Id = &ocm.ShareId{
OpaqueId: genID(),
}
share.Ctime = ts
share.Mtime = ts
m.model.ReceivedShares[share.Id.OpaqueId] = cloneReceivedShare(share)
if err := m.save(); err != nil {
return nil, err
}
return share, nil
}
func (m *mgr) ListReceivedShares(ctx context.Context, user *userpb.User) ([]*ocm.ReceivedShare, error) {
var rss []*ocm.ReceivedShare
m.Lock()
defer m.Unlock()
if err := m.load(); err != nil {
return nil, err
}
for _, share := range m.model.ReceivedShares {
if utils.UserEqual(user.Id, share.Owner) || utils.UserEqual(user.Id, share.Creator) {
// omit shares created by me
continue
}
if share.Grantee.Type == provider.GranteeType_GRANTEE_TYPE_USER && utils.UserEqual(user.Id, share.Grantee.GetUserId()) {
rss = append(rss, share)
}
}
return rss, nil
}
func (m *mgr) GetReceivedShare(ctx context.Context, user *userpb.User, ref *ocm.ShareReference) (*ocm.ReceivedShare, error) {
m.Lock()
defer m.Unlock()
if err := m.load(); err != nil {
return nil, err
}
for _, share := range m.model.ReceivedShares {
if receivedShareEqual(ref, share) {
if share.Grantee.Type == provider.GranteeType_GRANTEE_TYPE_USER && utils.UserEqual(user.Id, share.Grantee.GetUserId()) {
return share, nil
}
}
}
return nil, errtypes.NotFound(ref.String())
}
func (m *mgr) UpdateReceivedShare(ctx context.Context, user *userpb.User, share *ocm.ReceivedShare, fieldMask *field_mask.FieldMask) (*ocm.ReceivedShare, error) {
rs, err := m.GetReceivedShare(ctx, user, &ocm.ShareReference{Spec: &ocm.ShareReference_Id{Id: share.Id}})
if err != nil {
return nil, err
}
m.Lock()
defer m.Unlock()
if err := m.load(); err != nil {
return nil, err
}
for _, mask := range fieldMask.Paths {
switch mask {
case "state":
rs.State = share.State
m.model.ReceivedShares[share.Id.OpaqueId].State = share.State
// TODO case "mount_point":
default:
return nil, errtypes.NotSupported("updating " + mask + " is not supported")
}
}
if err := m.save(); err != nil {
return nil, errors.Wrap(err, "error saving model")
}
return rs, nil
}