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// GoToSocial
// Copyright (C) GoToSocial Authors admin@gotosocial.org
// SPDX-License-Identifier: AGPL-3.0-or-later
//
// 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"
"errors"
"fmt"
"codeberg.org/gruf/go-logger/v2/level"
"github.com/superseriousbusiness/activity/streams/vocab"
"github.com/superseriousbusiness/gotosocial/internal/ap"
"github.com/superseriousbusiness/gotosocial/internal/db"
"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
"github.com/superseriousbusiness/gotosocial/internal/log"
)
func (f *federatingDB) Undo(ctx context.Context, undo vocab.ActivityStreamsUndo) error {
l := log.Entry{}.WithContext(ctx)
if log.Level() >= level.DEBUG {
i, err := marshalItem(undo)
if err != nil {
return err
}
l = l.WithField("undo", i)
l.Debug("entering Undo")
}
receivingAccount, _ := extractFromCtx(ctx)
if receivingAccount == nil {
// If the receiving 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
}
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 ap.ActivityFollow:
// 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(ctx, 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 != receivingAccount.ID {
return errors.New("UNDO: follow object account and inbox account were not the same")
}
// delete any existing FOLLOW
if err := f.state.DB.DeleteWhere(ctx, []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.state.DB.DeleteWhere(ctx, []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 ap.ActivityLike:
// UNDO LIKE
case ap.ActivityAnnounce:
// UNDO BOOST/REBLOG/ANNOUNCE
case ap.ActivityBlock:
// 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(ctx, 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 != receivingAccount.ID {
return errors.New("UNDO: block object account and inbox account were not the same")
}
// delete any existing BLOCK
if err := f.state.DB.DeleteBlockByURI(ctx, gtsBlock.URI); err != nil {
return fmt.Errorf("UNDO: db error removing block: %s", err)
}
l.Debug("block undone")
return nil
}
}
return nil
}
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