[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

1 files changed, 52 insertions, 0 deletions

diff --git a/internal/api/model/webpushnotification.go b/internal/api/model/webpushnotification.go
new file mode 100644
index 000000000..5d7a593fc
--- /dev/null
+++ b/internal/api/model/webpushnotification.go
@@ -0,0 +1,52 @@
+// 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 model
+
+// WebPushNotification represents a notification summary delivered to the client by the Web Push server.
+// It does not contain an entire Notification, just the NotificationID and some preview information.
+// It is not used in the client API directly, but is included in the API doc for decoding Web Push notifications.
+//
+// swagger:model webPushNotification
+type WebPushNotification struct {
+	// NotificationID is the Notification.ID of the referenced Notification.
+	NotificationID string `json:"notification_id"`
+
+	// NotificationType is the Notification.Type of the referenced Notification.
+	NotificationType string `json:"notification_type"`
+
+	// Title is a title for the notification,
+	// generally describing an action taken by a user.
+	Title string `json:"title"`
+
+	// Body is a preview of the notification body,
+	// such as the first line of a status's CW or text,
+	// or the first line of an account bio.
+	Body string `json:"body"`
+
+	// Icon is an image URL that can be displayed with the notification,
+	// normally the account's avatar.
+	Icon string `json:"icon"`
+
+	// PreferredLocale is a BCP 47 language tag for the receiving user's locale.
+	PreferredLocale string `json:"preferred_locale"`
+
+	// AccessToken is the access token associated with the Web Push subscription.
+	// I don't know why this is sent, given that the client should know that already,
+	// but Feditext does use it.
+	AccessToken string `json:"access_token"`
+}