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 }