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/*
GoToSocial
Copyright (C) 2021 GoToSocial Authors admin@gotosocial.org
This program 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.
This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
package federatingdb
import (
"context"
"encoding/json"
"errors"
"fmt"
"github.com/go-fed/activity/streams"
"github.com/go-fed/activity/streams/vocab"
"github.com/sirupsen/logrus"
"github.com/superseriousbusiness/gotosocial/internal/db"
"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
"github.com/superseriousbusiness/gotosocial/internal/util"
)
func (f *federatingDB) Undo(ctx context.Context, undo vocab.ActivityStreamsUndo) error {
l := f.log.WithFields(
logrus.Fields{
"func": "Undo",
"asType": undo.GetTypeName(),
},
)
m, err := streams.Serialize(undo)
if err != nil {
return err
}
b, err := json.Marshal(m)
if err != nil {
return err
}
l.Debugf("received UNDO asType %s", string(b))
targetAcctI := ctx.Value(util.APAccount)
if targetAcctI == nil {
// If the target account wasn't set on the context, that means this request didn't pass through the
// API, but came from inside GtS as the result of another activity on this instance. That being so,
// we can safely just ignore this activity, since we know we've already processed it elsewhere.
return nil
}
targetAcct, ok := targetAcctI.(*gtsmodel.Account)
if !ok {
l.Error("UNDO: target account was set on context but couldn't be parsed")
return nil
}
undoObject := undo.GetActivityStreamsObject()
if undoObject == nil {
return errors.New("UNDO: no object set on vocab.ActivityStreamsUndo")
}
for iter := undoObject.Begin(); iter != undoObject.End(); iter = iter.Next() {
if iter.GetType() == nil {
continue
}
switch iter.GetType().GetTypeName() {
case string(gtsmodel.ActivityStreamsFollow):
// UNDO FOLLOW
ASFollow, ok := iter.GetType().(vocab.ActivityStreamsFollow)
if !ok {
return errors.New("UNDO: couldn't parse follow into vocab.ActivityStreamsFollow")
}
// make sure the actor owns the follow
if !sameActor(undo.GetActivityStreamsActor(), ASFollow.GetActivityStreamsActor()) {
return errors.New("UNDO: follow actor and activity actor not the same")
}
// convert the follow to something we can understand
gtsFollow, err := f.typeConverter.ASFollowToFollow(ASFollow)
if err != nil {
return fmt.Errorf("UNDO: error converting asfollow to gtsfollow: %s", err)
}
// make sure the addressee of the original follow is the same as whatever inbox this landed in
if gtsFollow.TargetAccountID != targetAcct.ID {
return errors.New("UNDO: follow object account and inbox account were not the same")
}
// delete any existing FOLLOW
if err := f.db.DeleteWhere([]db.Where{{Key: "uri", Value: gtsFollow.URI}}, >smodel.Follow{}); err != nil {
return fmt.Errorf("UNDO: db error removing follow: %s", err)
}
// delete any existing FOLLOW REQUEST
if err := f.db.DeleteWhere([]db.Where{{Key: "uri", Value: gtsFollow.URI}}, >smodel.FollowRequest{}); err != nil {
return fmt.Errorf("UNDO: db error removing follow request: %s", err)
}
l.Debug("follow undone")
return nil
case string(gtsmodel.ActivityStreamsLike):
// UNDO LIKE
case string(gtsmodel.ActivityStreamsAnnounce):
// UNDO BOOST/REBLOG/ANNOUNCE
case string(gtsmodel.ActivityStreamsBlock):
// UNDO BLOCK
ASBlock, ok := iter.GetType().(vocab.ActivityStreamsBlock)
if !ok {
return errors.New("UNDO: couldn't parse block into vocab.ActivityStreamsBlock")
}
// make sure the actor owns the follow
if !sameActor(undo.GetActivityStreamsActor(), ASBlock.GetActivityStreamsActor()) {
return errors.New("UNDO: block actor and activity actor not the same")
}
// convert the block to something we can understand
gtsBlock, err := f.typeConverter.ASBlockToBlock(ASBlock)
if err != nil {
return fmt.Errorf("UNDO: error converting asblock to gtsblock: %s", err)
}
// make sure the addressee of the original block is the same as whatever inbox this landed in
if gtsBlock.TargetAccountID != targetAcct.ID {
return errors.New("UNDO: block object account and inbox account were not the same")
}
// delete any existing BLOCK
if err := f.db.DeleteWhere([]db.Where{{Key: "uri", Value: gtsBlock.URI}}, >smodel.Block{}); err != nil {
return fmt.Errorf("UNDO: db error removing block: %s", err)
}
l.Debug("block undone")
return nil
}
}
return nil
}
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