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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 dereferencing
import (
"context"
"github.com/superseriousbusiness/gotosocial/internal/gtserror"
"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
"github.com/superseriousbusiness/gotosocial/internal/log"
)
// isPermittedStatus returns whether the given status
// is permitted to be stored on this instance, checking:
//
// - author is not suspended
// - status passes visibility checks
// - status passes interaction policy checks
//
// If status is not permitted to be stored, the function
// will clean up after itself by removing the status.
//
// If status is a reply or a boost, and the author of
// the given status is only permitted to reply or boost
// pending approval, then "PendingApproval" will be set
// to "true" on status. Callers should check this
// and handle it as appropriate.
func (d *Dereferencer) isPermittedStatus(
ctx context.Context,
requestUser string,
existing *gtsmodel.Status,
status *gtsmodel.Status,
) (
bool, // is permitted?
error,
) {
// our failure condition handling
// at the end of this function for
// the case of permission = false.
onFalse := func() (bool, error) {
if existing != nil {
log.Infof(ctx, "deleting unpermitted: %s", existing.URI)
// Delete existing status from database as it's no longer permitted.
if err := d.state.DB.DeleteStatusByID(ctx, existing.ID); err != nil {
log.Errorf(ctx, "error deleting %s after permissivity fail: %v", existing.URI, err)
}
}
return false, nil
}
if status.Account.IsSuspended() {
// The status author is suspended,
// this shouldn't have reached here
// but it's a fast check anyways.
log.Debugf(ctx,
"status author %s is suspended",
status.AccountURI,
)
return onFalse()
}
if inReplyTo := status.InReplyTo; inReplyTo != nil {
return d.isPermittedReply(
ctx,
requestUser,
status,
inReplyTo,
onFalse,
)
} else if boostOf := status.BoostOf; boostOf != nil {
return d.isPermittedBoost(
ctx,
requestUser,
status,
boostOf,
onFalse,
)
}
// Nothing else stopping this.
return true, nil
}
func (d *Dereferencer) isPermittedReply(
ctx context.Context,
requestUser string,
status *gtsmodel.Status,
inReplyTo *gtsmodel.Status,
onFalse func() (bool, error),
) (bool, error) {
if inReplyTo.BoostOfID != "" {
// We do not permit replies to
// boost wrapper statuses. (this
// shouldn't be able to happen).
log.Info(ctx, "rejecting reply to boost wrapper status")
return onFalse()
}
// Check visibility of local
// inReplyTo to replying account.
if inReplyTo.IsLocal() {
visible, err := d.visFilter.StatusVisible(ctx,
status.Account,
inReplyTo,
)
if err != nil {
err := gtserror.Newf("error checking inReplyTo visibility: %w", err)
return false, err
}
// Our status is not visible to the
// account trying to do the reply.
if !visible {
return onFalse()
}
}
// Check interaction policy of inReplyTo.
replyable, err := d.intFilter.StatusReplyable(ctx,
status.Account,
inReplyTo,
)
if err != nil {
err := gtserror.Newf("error checking status replyability: %w", err)
return false, err
}
if replyable.Forbidden() {
// Replier is not permitted
// to do this interaction.
return onFalse()
}
// TODO in next PR: check conditional /
// with approval and deref Accept.
if !replyable.Permitted() {
return onFalse()
}
return true, nil
}
func (d *Dereferencer) isPermittedBoost(
ctx context.Context,
requestUser string,
status *gtsmodel.Status,
boostOf *gtsmodel.Status,
onFalse func() (bool, error),
) (bool, error) {
if boostOf.BoostOfID != "" {
// We do not permit boosts of
// boost wrapper statuses. (this
// shouldn't be able to happen).
log.Info(ctx, "rejecting boost of boost wrapper status")
return onFalse()
}
// Check visibility of local
// boostOf to boosting account.
if boostOf.IsLocal() {
visible, err := d.visFilter.StatusVisible(ctx,
status.Account,
boostOf,
)
if err != nil {
err := gtserror.Newf("error checking boostOf visibility: %w", err)
return false, err
}
// Our status is not visible to the
// account trying to do the boost.
if !visible {
return onFalse()
}
}
// Check interaction policy of boostOf.
boostable, err := d.intFilter.StatusBoostable(ctx,
status.Account,
boostOf,
)
if err != nil {
err := gtserror.Newf("error checking status boostability: %w", err)
return false, err
}
if boostable.Forbidden() {
// Booster is not permitted
// to do this interaction.
return onFalse()
}
// TODO in next PR: check conditional /
// with approval and deref Accept.
if !boostable.Permitted() {
return onFalse()
}
return true, nil
}
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