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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 timeline
import (
"context"
"errors"
"strconv"
apimodel "github.com/superseriousbusiness/gotosocial/internal/api/model"
"github.com/superseriousbusiness/gotosocial/internal/db"
statusfilter "github.com/superseriousbusiness/gotosocial/internal/filter/status"
"github.com/superseriousbusiness/gotosocial/internal/filter/usermute"
"github.com/superseriousbusiness/gotosocial/internal/gtscontext"
"github.com/superseriousbusiness/gotosocial/internal/gtserror"
"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
"github.com/superseriousbusiness/gotosocial/internal/log"
"github.com/superseriousbusiness/gotosocial/internal/util"
)
func (p *Processor) PublicTimelineGet(
ctx context.Context,
requester *gtsmodel.Account,
maxID string,
sinceID string,
minID string,
limit int,
local bool,
) (*apimodel.PageableResponse, gtserror.WithCode) {
const maxAttempts = 3
var (
nextMaxIDValue string
prevMinIDValue string
items = make([]any, 0, limit)
)
var filters []*gtsmodel.Filter
var compiledMutes *usermute.CompiledUserMuteList
if requester != nil {
var err error
filters, err = p.state.DB.GetFiltersForAccountID(ctx, requester.ID)
if err != nil {
err = gtserror.Newf("couldn't retrieve filters for account %s: %w", requester.ID, err)
return nil, gtserror.NewErrorInternalError(err)
}
mutes, err := p.state.DB.GetAccountMutes(gtscontext.SetBarebones(ctx), requester.ID, nil)
if err != nil {
err = gtserror.Newf("couldn't retrieve mutes for account %s: %w", requester.ID, err)
return nil, gtserror.NewErrorInternalError(err)
}
compiledMutes = usermute.NewCompiledUserMuteList(mutes)
}
// Try a few times to select appropriate public
// statuses from the db, paging up or down to
// reattempt if nothing suitable is found.
outer:
for attempts := 1; ; attempts++ {
// Select slightly more than the limit to try to avoid situations where
// we filter out all the entries, and have to make another db call.
// It's cheaper to select more in 1 query than it is to do multiple queries.
statuses, err := p.state.DB.GetPublicTimeline(ctx, maxID, sinceID, minID, limit+5, local)
if err != nil && !errors.Is(err, db.ErrNoEntries) {
err = gtserror.Newf("db error getting statuses: %w", err)
return nil, gtserror.NewErrorInternalError(err)
}
count := len(statuses)
if count == 0 {
// Nothing relevant (left) in the db.
return util.EmptyPageableResponse(), nil
}
// Page up from first status in slice
// (ie., one with the highest ID).
prevMinIDValue = statuses[0].ID
inner:
for _, s := range statuses {
// Push back the next page down ID to
// this status, regardless of whether
// we end up filtering it out or not.
nextMaxIDValue = s.ID
timelineable, err := p.filter.StatusPublicTimelineable(ctx, requester, s)
if err != nil {
log.Errorf(ctx, "error checking status visibility: %v", err)
continue inner
}
if !timelineable {
continue inner
}
apiStatus, err := p.converter.StatusToAPIStatus(ctx, s, requester, statusfilter.FilterContextPublic, filters, compiledMutes)
if errors.Is(err, statusfilter.ErrHideStatus) {
continue
}
if err != nil {
log.Errorf(ctx, "error converting to api status: %v", err)
continue inner
}
// Looks good, add this.
items = append(items, apiStatus)
// We called the db with a little
// more than the desired limit.
//
// Ensure we don't return more
// than the caller asked for.
if len(items) == limit {
break outer
}
}
if len(items) != 0 {
// We've got some items left after
// filtering, happily break + return.
break
}
if attempts >= maxAttempts {
// We reached our attempts limit.
// Be nice + warn about it.
log.Warn(ctx, "reached max attempts to find items in public timeline")
break
}
// We filtered out all items before we
// found anything we could return, but
// we still have attempts left to try
// fetching again. Set paging params
// and allow loop to continue.
if minID != "" {
// Paging up.
minID = prevMinIDValue
} else {
// Paging down.
maxID = nextMaxIDValue
}
}
return util.PackagePageableResponse(util.PageableResponseParams{
Items: items,
Path: "/api/v1/timelines/public",
NextMaxIDValue: nextMaxIDValue,
PrevMinIDValue: prevMinIDValue,
Limit: limit,
ExtraQueryParams: []string{
"local=" + strconv.FormatBool(local),
},
})
}
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