[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, 20 insertions, 9 deletions

diff --git a/internal/gtsmodel/notification.go b/internal/gtsmodel/notification.go
index 1ef805081..d160e0883 100644
--- a/internal/gtsmodel/notification.go
+++ b/internal/gtsmodel/notification.go
@@ -48,13 +48,16 @@ const (
 	NotificationFollowRequest NotificationType = 2  // NotificationFollowRequest -- someone requested to follow you
 	NotificationMention       NotificationType = 3  // NotificationMention -- someone mentioned you in their status
 	NotificationReblog        NotificationType = 4  // NotificationReblog -- someone boosted one of your statuses
-	NotificationFave          NotificationType = 5  // NotificationFave -- someone faved/liked one of your statuses
+	NotificationFavourite     NotificationType = 5  // NotificationFavourite -- someone faved/liked one of your statuses
 	NotificationPoll          NotificationType = 6  // NotificationPoll -- a poll you voted in or created has ended
 	NotificationStatus        NotificationType = 7  // NotificationStatus -- someone you enabled notifications for has posted a status.
-	NotificationSignup        NotificationType = 8  // NotificationSignup -- someone has submitted a new account sign-up to the instance.
-	NotificationPendingFave   NotificationType = 9  // Someone has faved a status of yours, which requires approval by you.
-	NotificationPendingReply  NotificationType = 10 // Someone has replied to a status of yours, which requires approval by you.
-	NotificationPendingReblog NotificationType = 11 // Someone has boosted a status of yours, which requires approval by you.
+	NotificationAdminSignup   NotificationType = 8  // NotificationAdminSignup -- someone has submitted a new account sign-up to the instance.
+	NotificationPendingFave   NotificationType = 9  // NotificationPendingFave -- Someone has faved a status of yours, which requires approval by you.
+	NotificationPendingReply  NotificationType = 10 // NotificationPendingReply -- Someone has replied to a status of yours, which requires approval by you.
+	NotificationPendingReblog NotificationType = 11 // NotificationPendingReblog -- Someone has boosted a status of yours, which requires approval by you.
+	NotificationAdminReport   NotificationType = 12 // NotificationAdminReport -- someone has submitted a new report to the instance.
+	NotificationUpdate        NotificationType = 13 // NotificationUpdate -- someone has edited their status.
+	NotificationTypeNumValues NotificationType = 14 // NotificationTypeNumValues -- 1 + number of max notification type
 )
 
 // String returns a stringified, frontend API compatible form of NotificationType.
@@ -68,13 +71,13 @@ func (t NotificationType) String() string {
 		return "mention"
 	case NotificationReblog:
 		return "reblog"
-	case NotificationFave:
+	case NotificationFavourite:
 		return "favourite"
 	case NotificationPoll:
 		return "poll"
 	case NotificationStatus:
 		return "status"
-	case NotificationSignup:
+	case NotificationAdminSignup:
 		return "admin.sign_up"
 	case NotificationPendingFave:
 		return "pending.favourite"
@@ -82,6 +85,10 @@ func (t NotificationType) String() string {
 		return "pending.reply"
 	case NotificationPendingReblog:
 		return "pending.reblog"
+	case NotificationAdminReport:
+		return "admin.report"
+	case NotificationUpdate:
+		return "update"
 	default:
 		panic("invalid notification type")
 	}
@@ -99,19 +106,23 @@ func ParseNotificationType(in string) NotificationType {
 	case "reblog":
 		return NotificationReblog
 	case "favourite":
-		return NotificationFave
+		return NotificationFavourite
 	case "poll":
 		return NotificationPoll
 	case "status":
 		return NotificationStatus
 	case "admin.sign_up":
-		return NotificationSignup
+		return NotificationAdminSignup
 	case "pending.favourite":
 		return NotificationPendingFave
 	case "pending.reply":
 		return NotificationPendingReply
 	case "pending.reblog":
 		return NotificationPendingReblog
+	case "admin.report":
+		return NotificationAdminReport
+	case "update":
+		return NotificationUpdate
 	default:
 		return NotificationUnknown
 	}