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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"
"fmt"
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/text"
"github.com/superseriousbusiness/gotosocial/internal/util"
)
// TagTimelineGet gets a pageable timeline for the given
// tagName and given paging parameters. It will ensure
// that each status in the timeline is actually visible
// to requestingAcct before returning it.
func (p *Processor) TagTimelineGet(
ctx context.Context,
requestingAcct *gtsmodel.Account,
tagName string,
maxID string,
sinceID string,
minID string,
limit int,
) (*apimodel.PageableResponse, gtserror.WithCode) {
tag, errWithCode := p.getTag(ctx, tagName)
if errWithCode != nil {
return nil, errWithCode
}
if tag == nil || !*tag.Useable || !*tag.Listable {
// Obey mastodon API by returning 404 for this.
err := fmt.Errorf("tag was not found, or not useable/listable on this instance")
return nil, gtserror.NewErrorNotFound(err, err.Error())
}
statuses, err := p.state.DB.GetTagTimeline(ctx, tag.ID, maxID, sinceID, minID, limit)
if err != nil && !errors.Is(err, db.ErrNoEntries) {
err = gtserror.Newf("db error getting statuses: %w", err)
return nil, gtserror.NewErrorInternalError(err)
}
return p.packageTagResponse(
ctx,
requestingAcct,
statuses,
limit,
// Use API URL for tag.
"/api/v1/timelines/tag/"+tagName,
)
}
func (p *Processor) getTag(ctx context.Context, tagName string) (*gtsmodel.Tag, gtserror.WithCode) {
// Normalize + validate tag name.
tagNameNormal, ok := text.NormalizeHashtag(tagName)
if !ok {
err := gtserror.Newf("string '%s' could not be normalized to a valid hashtag", tagName)
return nil, gtserror.NewErrorBadRequest(err, err.Error())
}
// Ensure we have tag with this name in the db.
tag, err := p.state.DB.GetTagByName(ctx, tagNameNormal)
if err != nil && !errors.Is(err, db.ErrNoEntries) {
// Real db error.
err = gtserror.Newf("db error getting tag by name: %w", err)
return nil, gtserror.NewErrorInternalError(err)
}
return tag, nil
}
func (p *Processor) packageTagResponse(
ctx context.Context,
requestingAcct *gtsmodel.Account,
statuses []*gtsmodel.Status,
limit int,
requestPath string,
) (*apimodel.PageableResponse, gtserror.WithCode) {
count := len(statuses)
if count == 0 {
return util.EmptyPageableResponse(), nil
}
var (
items = make([]interface{}, 0, count)
// Set next + prev values before filtering and API
// converting, so caller can still page properly.
nextMaxIDValue = statuses[count-1].ID
prevMinIDValue = statuses[0].ID
)
filters, err := p.state.DB.GetFiltersForAccountID(ctx, requestingAcct.ID)
if err != nil {
err = gtserror.Newf("couldn't retrieve filters for account %s: %w", requestingAcct.ID, err)
return nil, gtserror.NewErrorInternalError(err)
}
mutes, err := p.state.DB.GetAccountMutes(gtscontext.SetBarebones(ctx), requestingAcct.ID, nil)
if err != nil {
err = gtserror.Newf("couldn't retrieve mutes for account %s: %w", requestingAcct.ID, err)
return nil, gtserror.NewErrorInternalError(err)
}
compiledMutes := usermute.NewCompiledUserMuteList(mutes)
for _, s := range statuses {
timelineable, err := p.filter.StatusTagTimelineable(ctx, requestingAcct, s)
if err != nil {
log.Errorf(ctx, "error checking status visibility: %v", err)
continue
}
if !timelineable {
continue
}
apiStatus, err := p.converter.StatusToAPIStatus(ctx, s, requestingAcct, 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
}
items = append(items, apiStatus)
}
return util.PackagePageableResponse(util.PageableResponseParams{
Items: items,
Path: requestPath,
NextMaxIDValue: nextMaxIDValue,
PrevMinIDValue: prevMinIDValue,
Limit: limit,
})
}
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