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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 visibility
import (
"context"
"fmt"
"github.com/superseriousbusiness/gotosocial/internal/cache"
"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
"github.com/superseriousbusiness/gotosocial/internal/log"
)
// StatusesVisible calls StatusVisible for each status in the statuses slice, and returns a slice of only statuses which are visible to the requester.
func (f *Filter) StatusesVisible(ctx context.Context, requester *gtsmodel.Account, statuses []*gtsmodel.Status) ([]*gtsmodel.Status, error) {
// Preallocate slice of maximum possible length.
filtered := make([]*gtsmodel.Status, 0, len(statuses))
for _, status := range statuses {
// Check whether status is visible to requester.
visible, err := f.StatusVisible(ctx, requester, status)
if err != nil {
return nil, err
}
if visible {
// Add filtered status to ret slice.
filtered = append(filtered, status)
}
}
return filtered, nil
}
// StatusVisible will check if given status is visible to requester, accounting for requester with no auth (i.e is nil), suspensions, disabled local users, account blocks and status privacy.
func (f *Filter) StatusVisible(ctx context.Context, requester *gtsmodel.Account, status *gtsmodel.Status) (bool, error) {
// By default we assume no auth.
requesterID := noauth
if requester != nil {
// Use provided account ID.
requesterID = requester.ID
}
visibility, err := f.state.Caches.Visibility.Load("Type.RequesterID.ItemID", func() (*cache.CachedVisibility, error) {
// Visibility not yet cached, perform visibility lookup.
visible, err := f.isStatusVisible(ctx, requester, status)
if err != nil {
return nil, err
}
// Return visibility value.
return &cache.CachedVisibility{
ItemID: status.ID,
RequesterID: requesterID,
Type: cache.VisibilityTypeStatus,
Value: visible,
}, nil
}, "status", requesterID, status.ID)
if err != nil {
return false, err
}
return visibility.Value, nil
}
// isStatusVisible will check if status is visible to requester. It is the "meat" of the logic to Filter{}.StatusVisible() which is called within cache loader callback.
func (f *Filter) isStatusVisible(ctx context.Context, requester *gtsmodel.Account, status *gtsmodel.Status) (bool, error) {
// Ensure that status is fully populated for further processing.
if err := f.state.DB.PopulateStatus(ctx, status); err != nil {
return false, err
}
// Check whether status accounts are visible to the requester.
visible, err := f.areStatusAccountsVisible(ctx, requester, status)
if err != nil {
return false, fmt.Errorf("isStatusVisible: error checking status %s account visibility: %w", status.ID, err)
} else if !visible {
return false, nil
}
if status.Visibility == gtsmodel.VisibilityPublic {
// This status will be visible to all.
return true, nil
}
if requester == nil {
// This request is WITHOUT auth, and status is NOT public.
log.Trace(ctx, "unauthorized request to non-public status")
return false, nil
}
if status.Visibility == gtsmodel.VisibilityUnlocked {
// This status is visible to all auth'd accounts.
return true, nil
}
if requester.ID == status.AccountID {
// Author can always see their own status.
return true, nil
}
if status.MentionsAccount(requester.ID) {
// Status mentions the requesting account.
return true, nil
}
if status.BoostOf != nil {
if !status.BoostOf.MentionsPopulated() {
// Boosted status needs its mentions populating, fetch these from database.
status.BoostOf.Mentions, err = f.state.DB.GetMentions(ctx, status.BoostOf.MentionIDs)
if err != nil {
return false, fmt.Errorf("isStatusVisible: error populating boosted status %s mentions: %w", status.BoostOfID, err)
}
}
if status.BoostOf.MentionsAccount(requester.ID) {
// Boosted status mentions the requesting account.
return true, nil
}
}
switch status.Visibility {
case gtsmodel.VisibilityFollowersOnly:
// Check requester follows status author.
follows, err := f.state.DB.IsFollowing(ctx,
requester.ID,
status.AccountID,
)
if err != nil {
return false, fmt.Errorf("isStatusVisible: error checking follow %s->%s: %w", requester.ID, status.AccountID, err)
}
if !follows {
log.Trace(ctx, "follow-only status not visible to requester")
return false, nil
}
return true, nil
case gtsmodel.VisibilityMutualsOnly:
// Check mutual following between requester and author.
mutuals, err := f.state.DB.IsMutualFollowing(ctx,
requester.ID,
status.AccountID,
)
if err != nil {
return false, fmt.Errorf("isStatusVisible: error checking mutual follow %s<->%s: %w", requester.ID, status.AccountID, err)
}
if !mutuals {
log.Trace(ctx, "mutual-only status not visible to requester")
return false, nil
}
return true, nil
case gtsmodel.VisibilityDirect:
log.Trace(ctx, "direct status not visible to requester")
return false, nil
default:
log.Warnf(ctx, "unexpected status visibility %s for %s", status.Visibility, status.URI)
return false, nil
}
}
// areStatusAccountsVisible calls Filter{}.AccountVisible() on status author and the status boost-of (if set) author, returning visibility of status (and boost-of) to requester.
func (f *Filter) areStatusAccountsVisible(ctx context.Context, requester *gtsmodel.Account, status *gtsmodel.Status) (bool, error) {
// Check whether status author's account is visible to requester.
visible, err := f.AccountVisible(ctx, requester, status.Account)
if err != nil {
return false, err
}
if !visible {
log.Trace(ctx, "status author not visible to requester")
return false, nil
}
if status.BoostOfID != "" {
// This is a boosted status.
if status.AccountID == status.BoostOfAccountID {
// Some clout-chaser boosted their own status, tch.
return true, nil
}
// Check whether boosted status author's account is visible to requester.
visible, err := f.AccountVisible(ctx, requester, status.BoostOfAccount)
if err != nil {
return false, err
}
if !visible {
log.Trace(ctx, "boosted status author not visible to requester")
return false, nil
}
}
return true, nil
}
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