[feature] Push notifications (#3587)

* Update push subscription API model to be Mastodon 4.0 compatible

* Add webpush-go dependency

# Conflicts:
#	go.sum

* Single-row table for storing instance's VAPID key pair

* Generate VAPID key pair during startup

* Add VAPID public key to instance info API

* Return VAPID public key when registering an app

* Store Web Push subscriptions in DB

* Add Web Push sender (similar to email sender)

* Add no-op push senders to most processor tests

* Test Web Push notifications from workers

* Delete Web Push subscriptions when account is deleted

* Implement push subscription API

* Linter fixes

* Update Swagger

* Fix enum to int migration

* Fix GetVAPIDKeyPair

* Create web push subscriptions table with indexes

* Log Web Push server error messages

* Send instance URL as Web Push JWT subject

* Accept any 2xx code as a success

* Fix malformed VAPID sub claim

* Use packed notification flags

* Remove unused date columns

* Add notification type for update notifications

Not used yet

* Make GetVAPIDKeyPair idempotent

and remove PutVAPIDKeyPair

* Post-rebase fixes

* go mod tidy

* Special-case 400 errors other than 408/429

Most client errors should remove the subscription.

* Improve titles, trim body to reasonable length

* Disallow cleartext HTTP for Web Push servers

* Fix lint

* Remove redundant index on unique column

Also removes redundant unique and notnull tags on ID column since these are implied by pk

* Make realsender.go more readable

* Use Tobi's style for wrapping errors

* Restore treating all 5xx codes as temporary problems

* Always load target account settings

* Stub `policy` and `standard`

* webpush.Sender: take type converter as ctor param

* Move webpush.MockSender and noopSender into testrig

testrig/webpush.go

@@ -0,0 +1,65 @@
+// 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 testrig
+
+import (
+	"context"
+
+	"github.com/superseriousbusiness/gotosocial/internal/filter/usermute"
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+	"github.com/superseriousbusiness/gotosocial/internal/webpush"
+)
+
+// WebPushMockSender collects a map of notifications sent to each account ID.
+type WebPushMockSender struct {
+	Sent map[string][]*gtsmodel.Notification
+}
+
+// NewWebPushMockSender creates a mock sender that can record sent Web Push notifications for test expectations.
+func NewWebPushMockSender() *WebPushMockSender {
+	return &WebPushMockSender{
+		Sent: map[string][]*gtsmodel.Notification{},
+	}
+}
+
+func (m *WebPushMockSender) Send(
+	ctx context.Context,
+	notification *gtsmodel.Notification,
+	filters []*gtsmodel.Filter,
+	mutes *usermute.CompiledUserMuteList,
+) error {
+	m.Sent[notification.TargetAccountID] = append(m.Sent[notification.TargetAccountID], notification)
+	return nil
+}
+
+// noopSender drops anything sent to it.
+type noopWebPushSender struct{}
+
+// NewNoopWebPushSender creates a no-op sender that does nothing.
+func NewNoopWebPushSender() webpush.Sender {
+	return &noopWebPushSender{}
+}
+
+func (n *noopWebPushSender) Send(
+	ctx context.Context,
+	notification *gtsmodel.Notification,
+	filters []*gtsmodel.Filter,
+	mutes *usermute.CompiledUserMuteList,
+) error {
+	return nil
+}