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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/gtscontext"
"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.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, _, internal := extractFromCtx(ctx)
if internal {
return nil // Already processed.
}
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() {
t := iter.GetType()
if t == nil {
continue
}
switch t.GetTypeName() {
case ap.ActivityFollow:
if err := f.undoFollow(ctx, receivingAccount, undo, t); err != nil {
return err
}
case ap.ActivityLike:
if err := f.undoLike(ctx, receivingAccount, undo, t); err != nil {
return err
}
case ap.ActivityAnnounce:
// todo: undo boost / reblog / announce
case ap.ActivityBlock:
if err := f.undoBlock(ctx, receivingAccount, undo, t); err != nil {
return err
}
}
}
return nil
}
func (f *federatingDB) undoFollow(
ctx context.Context,
receivingAccount *gtsmodel.Account,
undo vocab.ActivityStreamsUndo,
t vocab.Type,
) error {
Follow, ok := t.(vocab.ActivityStreamsFollow)
if !ok {
return errors.New("undoFollow: couldn't parse vocab.Type into vocab.ActivityStreamsFollow")
}
// Make sure the undo actor owns the target.
if !sameActor(undo.GetActivityStreamsActor(), Follow.GetActivityStreamsActor()) {
// Ignore this Activity.
return nil
}
follow, err := f.typeConverter.ASFollowToFollow(ctx, Follow)
if err != nil {
return fmt.Errorf("undoFollow: error converting ActivityStreams Follow to follow: %w", err)
}
// Ensure addressee is follow target.
if follow.TargetAccountID != receivingAccount.ID {
// Ignore this Activity.
return nil
}
// Delete any existing follow with this URI.
if err := f.state.DB.DeleteFollowByURI(ctx, follow.URI); err != nil && !errors.Is(err, db.ErrNoEntries) {
return fmt.Errorf("undoFollow: db error removing follow: %w", err)
}
// Delete any existing follow request with this URI.
if err := f.state.DB.DeleteFollowRequestByURI(ctx, follow.URI); err != nil && !errors.Is(err, db.ErrNoEntries) {
return fmt.Errorf("undoFollow: db error removing follow request: %w", err)
}
log.Debug(ctx, "Follow undone")
return nil
}
func (f *federatingDB) undoLike(
ctx context.Context,
receivingAccount *gtsmodel.Account,
undo vocab.ActivityStreamsUndo,
t vocab.Type,
) error {
Like, ok := t.(vocab.ActivityStreamsLike)
if !ok {
return errors.New("undoLike: couldn't parse vocab.Type into vocab.ActivityStreamsLike")
}
// Make sure the undo actor owns the target.
if !sameActor(undo.GetActivityStreamsActor(), Like.GetActivityStreamsActor()) {
// Ignore this Activity.
return nil
}
fave, err := f.typeConverter.ASLikeToFave(ctx, Like)
if err != nil {
return fmt.Errorf("undoLike: error converting ActivityStreams Like to fave: %w", err)
}
// Ensure addressee is fave target.
if fave.TargetAccountID != receivingAccount.ID {
// Ignore this Activity.
return nil
}
// Ignore URI on Likes, since we often get multiple Likes
// with the same target and account ID, but differing URIs.
// Instead, we'll select using account and target status.
// Regardless of the URI, we can read an Undo Like to mean
// "I don't want to fave this post anymore".
fave, err = f.state.DB.GetStatusFave(gtscontext.SetBarebones(ctx), fave.AccountID, fave.StatusID)
if err != nil {
if errors.Is(err, db.ErrNoEntries) {
// We didn't have a like/fave
// for this combo anyway, ignore.
return nil
}
// Real error.
return fmt.Errorf("undoLike: db error getting fave from %s targeting %s: %w", fave.AccountID, fave.StatusID, err)
}
// Delete the status fave.
if err := f.state.DB.DeleteStatusFaveByID(ctx, fave.ID); err != nil {
return fmt.Errorf("undoLike: db error deleting fave %s: %w", fave.ID, err)
}
log.Debug(ctx, "Like undone")
return nil
}
func (f *federatingDB) undoBlock(
ctx context.Context,
receivingAccount *gtsmodel.Account,
undo vocab.ActivityStreamsUndo,
t vocab.Type,
) error {
Block, ok := t.(vocab.ActivityStreamsBlock)
if !ok {
return errors.New("undoBlock: couldn't parse vocab.Type into vocab.ActivityStreamsBlock")
}
// Make sure the undo actor owns the target.
if !sameActor(undo.GetActivityStreamsActor(), Block.GetActivityStreamsActor()) {
// Ignore this Activity.
return nil
}
block, err := f.typeConverter.ASBlockToBlock(ctx, Block)
if err != nil {
return fmt.Errorf("undoBlock: error converting ActivityStreams Block to block: %w", err)
}
// Ensure addressee is block target.
if block.TargetAccountID != receivingAccount.ID {
// Ignore this Activity.
return nil
}
// Delete any existing BLOCK
if err := f.state.DB.DeleteBlockByURI(ctx, block.URI); err != nil && !errors.Is(err, db.ErrNoEntries) {
return fmt.Errorf("undoBlock: db error removing block: %w", err)
}
log.Debug(ctx, "Block undone")
return nil
}
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