[feature] Implemented notification clear (#720)

* Implemented notification clear

* Added the cache clear mechanism

* added multi user check test

internal/api/client/notification/notification.go

@@ -34,6 +34,7 @@
 	// BasePathWithID is just the base path with the ID key in it.
 	// Use this anywhere you need to know the ID of the notification being queried.
 	BasePathWithID    = BasePath + "/:" + IDKey
+	BasePathWithClear = BasePath + "/clear"
 
 	// MaxIDKey is the url query for setting a max notification ID to return
 	MaxIDKey = "max_id"
@@ -58,5 +59,6 @@ func New(processor processing.Processor) api.ClientModule {
 // Route attaches all routes from this module to the given router
 func (m *Module) Route(r router.Router) error {
 	r.AttachHandler(http.MethodGet, BasePath, m.NotificationsGETHandler)
+	r.AttachHandler(http.MethodPost, BasePathWithClear, m.NotificationsClearPOSTHandler)
 	return nil
 }

internal/api/client/notification/notificationsclear.go

@@ -0,0 +1,50 @@
+/*
+   GoToSocial
+   Copyright (C) 2021-2022 GoToSocial Authors admin@gotosocial.org
+
+   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 notification
+
+import (
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+	"github.com/superseriousbusiness/gotosocial/internal/api"
+	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
+	"github.com/superseriousbusiness/gotosocial/internal/oauth"
+)
+
+// NotificationsClearPOSTHandler clears all the notifications
+func (m *Module) NotificationsClearPOSTHandler(c *gin.Context) {
+	authed, err := oauth.Authed(c, true, true, true, true)
+	if err != nil {
+		api.ErrorHandler(c, gtserror.NewErrorUnauthorized(err, err.Error()), m.processor.InstanceGet)
+		return
+	}
+
+	if _, err := api.NegotiateAccept(c, api.JSONAcceptHeaders...); err != nil {
+		api.ErrorHandler(c, gtserror.NewErrorNotAcceptable(err, err.Error()), m.processor.InstanceGet)
+		return
+	}
+
+	errWithCode := m.processor.NotificationsClear(c.Request.Context(), authed)
+	if errWithCode != nil {
+		api.ErrorHandler(c, errWithCode, m.processor.InstanceGet)
+		return
+	}
+
+	c.JSON(http.StatusOK, struct{}{})
+}

internal/db/bundb/notification.go

@@ -108,3 +108,17 @@ func (n *notificationDB) GetNotifications(ctx context.Context, accountID string,
 
 	return notifs, nil
 }
+
+func (n *notificationDB) ClearNotifications(ctx context.Context, accountID string) db.Error {
+	if _, err := n.conn.
+		NewDelete().
+		Table("notifications").
+		Where("target_account_id = ?", accountID).
+		Exec(ctx); err != nil {
+		return n.conn.ProcessError(err)
+	}
+
+	n.cache.Clear()
+
+	return nil
+}

internal/db/bundb/notification_test.go

@@ -118,6 +118,35 @@ func (suite *NotificationTestSuite) TestGetNotificationsWithoutSpam() {
 	}
 }
 
+func (suite *NotificationTestSuite) TestClearNotificationsWithSpam() {
+	suite.spamNotifs()
+	testAccount := suite.testAccounts["local_account_1"]
+	err := suite.db.ClearNotifications(context.Background(), testAccount.ID)
+	suite.NoError(err)
+
+	notifications, err := suite.db.GetNotifications(context.Background(), testAccount.ID, 20, "ZZZZZZZZZZZZZZZZZZZZZZZZZZ", "00000000000000000000000000")
+	suite.NoError(err)
+	suite.NotNil(notifications)
+	suite.Empty(notifications)
+}
+
+func (suite *NotificationTestSuite) TestClearNotificationsWithTwoAccounts() {
+	suite.spamNotifs()
+	testAccount := suite.testAccounts["local_account_1"]
+	err := suite.db.ClearNotifications(context.Background(), testAccount.ID)
+	suite.NoError(err)
+
+	notifications, err := suite.db.GetNotifications(context.Background(), testAccount.ID, 20, "ZZZZZZZZZZZZZZZZZZZZZZZZZZ", "00000000000000000000000000")
+	suite.NoError(err)
+	suite.NotNil(notifications)
+	suite.Empty(notifications)
+
+	notif := []*gtsmodel.Notification{}
+	err = suite.db.GetAll(context.Background(), &notif)
+	suite.NoError(err)
+	suite.NotEmpty(notif)
+}
+
 func TestNotificationTestSuite(t *testing.T) {
 	suite.Run(t, new(NotificationTestSuite))
 }

internal/db/notification.go

@@ -32,4 +32,6 @@ type Notification interface {
 	GetNotifications(ctx context.Context, accountID string, limit int, maxID string, sinceID string) ([]*gtsmodel.Notification, Error)
 	// GetNotification returns one notification according to its id.
 	GetNotification(ctx context.Context, id string) (*gtsmodel.Notification, Error)
+	// ClearNotifications deletes every notification that pertain to the given accountID.
+	ClearNotifications(ctx context.Context, accountID string) Error
 }

internal/processing/notification.go

@@ -58,3 +58,12 @@ func (p *processor) NotificationsGet(ctx context.Context, authed *oauth.Auth, li
 		Limit:          limit,
 	})
 }
+
+func (p *processor) NotificationsClear(ctx context.Context, authed *oauth.Auth) gtserror.WithCode {
+	err := p.db.ClearNotifications(ctx, authed.Account.ID)
+	if err != nil {
+		return gtserror.NewErrorInternalError(err)
+	}
+
+	return nil
+}

internal/processing/processor.go

@@ -155,6 +155,8 @@ type Processor interface {
 
 	// NotificationsGet
 	NotificationsGet(ctx context.Context, authed *oauth.Auth, limit int, maxID string, sinceID string) (*apimodel.TimelineResponse, gtserror.WithCode)
+	// NotificationsClear
+	NotificationsClear(ctx context.Context, authed *oauth.Auth) gtserror.WithCode
 
 	OAuthHandleTokenRequest(r *http.Request) (map[string]interface{}, gtserror.WithCode)
 	OAuthHandleAuthorizeRequest(w http.ResponseWriter, r *http.Request) error