[feature] Add List functionality (#1802)

* start working on lists

* further list work

* test list db functions nicely

* more work on lists

* peepoopeepoo

* poke

* start list timeline func

* we're getting there lads

* couldn't be me working on stuff... could it?

* hook up handlers

* fiddling

* weeee

* woah

* screaming, pissing

* fix streaming being a whiny baby

* lint, small test fix, swagger

* tidying up, testing

* fucked! by the linter

* move timelines to state like a boss

* add timeline start to tests using state

* invalidate lists

1 files changed, 144 insertions, 0 deletions

diff --git a/internal/processing/timeline/notification.go b/internal/processing/timeline/notification.go
new file mode 100644
index 000000000..4a79fb82a
--- /dev/null
+++ b/internal/processing/timeline/notification.go
@@ -0,0 +1,144 @@
+// 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"
+	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+	"github.com/superseriousbusiness/gotosocial/internal/log"
+	"github.com/superseriousbusiness/gotosocial/internal/oauth"
+	"github.com/superseriousbusiness/gotosocial/internal/util"
+)
+
+func (p *Processor) NotificationsGet(ctx context.Context, authed *oauth.Auth, maxID string, sinceID string, minID string, limit int, excludeTypes []string) (*apimodel.PageableResponse, gtserror.WithCode) {
+	notifs, err := p.state.DB.GetAccountNotifications(ctx, authed.Account.ID, maxID, sinceID, minID, limit, excludeTypes)
+	if err != nil && !errors.Is(err, db.ErrNoEntries) {
+		err = fmt.Errorf("NotificationsGet: db error getting notifications: %w", err)
+		return nil, gtserror.NewErrorInternalError(err)
+	}
+
+	count := len(notifs)
+	if count == 0 {
+		return util.EmptyPageableResponse(), nil
+	}
+
+	var (
+		items          = make([]interface{}, 0, count)
+		nextMaxIDValue string
+		prevMinIDValue string
+	)
+
+	for i, n := range notifs {
+		// Set next + prev values before filtering and API
+		// converting, so caller can still page properly.
+		if i == count-1 {
+			nextMaxIDValue = n.ID
+		}
+
+		if i == 0 {
+			prevMinIDValue = n.ID
+		}
+
+		// Ensure this notification should be shown to requester.
+		if n.OriginAccount != nil {
+			// Account is set, ensure it's visible to notif target.
+			visible, err := p.filter.AccountVisible(ctx, authed.Account, n.OriginAccount)
+			if err != nil {
+				log.Debugf(ctx, "skipping notification %s because of an error checking notification visibility: %s", n.ID, err)
+				continue
+			}
+
+			if !visible {
+				continue
+			}
+		}
+
+		if n.Status != nil {
+			// Status is set, ensure it's visible to notif target.
+			visible, err := p.filter.StatusVisible(ctx, authed.Account, n.Status)
+			if err != nil {
+				log.Debugf(ctx, "skipping notification %s because of an error checking notification visibility: %s", n.ID, err)
+				continue
+			}
+
+			if !visible {
+				continue
+			}
+		}
+
+		item, err := p.tc.NotificationToAPINotification(ctx, n)
+		if err != nil {
+			log.Debugf(ctx, "skipping notification %s because it couldn't be converted to its api representation: %s", n.ID, err)
+			continue
+		}
+
+		items = append(items, item)
+	}
+
+	return util.PackagePageableResponse(util.PageableResponseParams{
+		Items:          items,
+		Path:           "api/v1/notifications",
+		NextMaxIDValue: nextMaxIDValue,
+		PrevMinIDValue: prevMinIDValue,
+		Limit:          limit,
+	})
+}
+
+func (p *Processor) NotificationGet(ctx context.Context, account *gtsmodel.Account, targetNotifID string) (*apimodel.Notification, gtserror.WithCode) {
+	notif, err := p.state.DB.GetNotificationByID(ctx, targetNotifID)
+	if err != nil {
+		if errors.Is(err, db.ErrNoEntries) {
+			return nil, gtserror.NewErrorNotFound(err)
+		}
+
+		// Real error.
+		return nil, gtserror.NewErrorInternalError(err)
+	}
+
+	if notifTargetAccountID := notif.TargetAccountID; notifTargetAccountID != account.ID {
+		err = fmt.Errorf("account %s does not have permission to view notification belong to account %s", account.ID, notifTargetAccountID)
+		return nil, gtserror.NewErrorNotFound(err)
+	}
+
+	apiNotif, err := p.tc.NotificationToAPINotification(ctx, notif)
+	if err != nil {
+		if errors.Is(err, db.ErrNoEntries) {
+			return nil, gtserror.NewErrorNotFound(err)
+		}
+
+		// Real error.
+		return nil, gtserror.NewErrorInternalError(err)
+	}
+
+	return apiNotif, nil
+}
+
+func (p *Processor) NotificationsClear(ctx context.Context, authed *oauth.Auth) gtserror.WithCode {
+	// Delete all notifications of all types that target the authorized account.
+	if err := p.state.DB.DeleteNotifications(ctx, nil, authed.Account.ID, ""); err != nil && !errors.Is(err, db.ErrNoEntries) {
+		return gtserror.NewErrorInternalError(err)
+	}
+
+	return nil
+}