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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 status
import (
"context"
"errors"
"fmt"
"time"
apimodel "github.com/superseriousbusiness/gotosocial/internal/api/model"
"github.com/superseriousbusiness/gotosocial/internal/gtserror"
"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
)
const allowedPinnedCount = 10
// getPinnableStatus fetches targetStatusID status and ensures that requestingAccountID
// can pin or unpin it.
//
// It checks:
// - Status is visible to requesting account.
// - Status belongs to requesting account.
// - Status is public, unlisted, or followers-only.
// - Status is not a boost.
func (p *Processor) getPinnableStatus(ctx context.Context, requestingAccount *gtsmodel.Account, targetStatusID string) (*gtsmodel.Status, gtserror.WithCode) {
targetStatus, errWithCode := p.c.GetVisibleTargetStatus(ctx,
requestingAccount,
targetStatusID,
nil, // default freshness
)
if errWithCode != nil {
return nil, errWithCode
}
if targetStatus.AccountID != requestingAccount.ID {
err := fmt.Errorf("status %s does not belong to account %s", targetStatusID, requestingAccount.ID)
return nil, gtserror.NewErrorUnprocessableEntity(err, err.Error())
}
if targetStatus.Visibility == gtsmodel.VisibilityDirect {
err := errors.New("cannot pin direct messages")
return nil, gtserror.NewErrorUnprocessableEntity(err, err.Error())
}
if targetStatus.BoostOfID != "" {
err := errors.New("cannot pin boosts")
return nil, gtserror.NewErrorUnprocessableEntity(err, err.Error())
}
return targetStatus, nil
}
// PinCreate pins the target status to the top of requestingAccount's profile, if possible.
//
// Conditions for a pin to work:
// - Status belongs to requesting account.
// - Status is public, unlisted, or followers-only.
// - Status is not a boost.
// - Status is not already pinnd.
// - Limit of pinned statuses not yet met or exceeded.
//
// If the conditions can't be met, then code 422 Unprocessable Entity will be returned.
func (p *Processor) PinCreate(ctx context.Context, requestingAccount *gtsmodel.Account, targetStatusID string) (*apimodel.Status, gtserror.WithCode) {
targetStatus, errWithCode := p.getPinnableStatus(ctx, requestingAccount, targetStatusID)
if errWithCode != nil {
return nil, errWithCode
}
// Get a lock on this account.
unlock := p.state.ProcessingLocks.Lock(requestingAccount.URI)
defer unlock()
if !targetStatus.PinnedAt.IsZero() {
err := errors.New("status already pinned")
return nil, gtserror.NewErrorUnprocessableEntity(err, err.Error())
}
// Ensure account stats populated.
if requestingAccount.Stats == nil {
if err := p.state.DB.PopulateAccountStats(ctx, requestingAccount); err != nil {
err = gtserror.Newf("db error getting account stats: %w", err)
return nil, gtserror.NewErrorInternalError(err)
}
}
pinnedCount := *requestingAccount.Stats.StatusesPinnedCount
if pinnedCount >= allowedPinnedCount {
err := fmt.Errorf("status pin limit exceeded, you've already pinned %d status(es) out of %d", pinnedCount, allowedPinnedCount)
return nil, gtserror.NewErrorUnprocessableEntity(err, err.Error())
}
targetStatus.PinnedAt = time.Now()
if err := p.state.DB.UpdateStatus(ctx, targetStatus, "pinned_at"); err != nil {
err = gtserror.Newf("db error pinning status: %w", err)
return nil, gtserror.NewErrorInternalError(err)
}
// Update account stats.
*requestingAccount.Stats.StatusesPinnedCount++
if err := p.state.DB.UpdateAccountStats(
ctx,
requestingAccount.Stats,
"statuses_pinned_count",
); err != nil {
err = gtserror.Newf("db error updating stats: %w", err)
return nil, gtserror.NewErrorInternalError(err)
}
if err := p.c.InvalidateTimelinedStatus(ctx, requestingAccount.ID, targetStatusID); err != nil {
err = gtserror.Newf("error invalidating status from timelines: %w", err)
return nil, gtserror.NewErrorInternalError(err)
}
return p.c.GetAPIStatus(ctx, requestingAccount, targetStatus)
}
// PinRemove unpins the target status from the top of requestingAccount's profile, if possible.
//
// Conditions for an unpin to work:
// - Status belongs to requesting account.
// - Status is public, unlisted, or followers-only.
// - Status is not a boost.
//
// If the conditions can't be met, then code 422 Unprocessable Entity will be returned.
//
// Unlike with PinCreate, statuses that are already unpinned will not return 422, but just do
// nothing and return the api model representation of the status, to conform to the masto API.
func (p *Processor) PinRemove(ctx context.Context, requestingAccount *gtsmodel.Account, targetStatusID string) (*apimodel.Status, gtserror.WithCode) {
targetStatus, errWithCode := p.getPinnableStatus(ctx, requestingAccount, targetStatusID)
if errWithCode != nil {
return nil, errWithCode
}
// Get a lock on this account.
unlock := p.state.ProcessingLocks.Lock(requestingAccount.URI)
defer unlock()
if targetStatus.PinnedAt.IsZero() {
// Status already not pinned.
return p.c.GetAPIStatus(ctx, requestingAccount, targetStatus)
}
// Ensure account stats populated.
if requestingAccount.Stats == nil {
if err := p.state.DB.PopulateAccountStats(ctx, requestingAccount); err != nil {
err = gtserror.Newf("db error getting account stats: %w", err)
return nil, gtserror.NewErrorInternalError(err)
}
}
targetStatus.PinnedAt = time.Time{}
if err := p.state.DB.UpdateStatus(ctx, targetStatus, "pinned_at"); err != nil {
err = gtserror.Newf("db error unpinning status: %w", err)
return nil, gtserror.NewErrorInternalError(err)
}
// Update account stats.
//
// Clamp to 0 to avoid funny business.
*requestingAccount.Stats.StatusesPinnedCount--
if *requestingAccount.Stats.StatusesPinnedCount < 0 {
*requestingAccount.Stats.StatusesPinnedCount = 0
}
if err := p.state.DB.UpdateAccountStats(
ctx,
requestingAccount.Stats,
"statuses_pinned_count",
); err != nil {
err = gtserror.Newf("db error updating stats: %w", err)
return nil, gtserror.NewErrorInternalError(err)
}
if err := p.c.InvalidateTimelinedStatus(ctx, requestingAccount.ID, targetStatusID); err != nil {
err = gtserror.Newf("error invalidating status from timelines: %w", err)
return nil, gtserror.NewErrorInternalError(err)
}
return p.c.GetAPIStatus(ctx, requestingAccount, targetStatus)
}
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