[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, 31 insertions, 3 deletions

diff --git a/testrig/testmodels.go b/testrig/testmodels.go
index da4202eed..9a54aba70 100644
--- a/testrig/testmodels.go
+++ b/testrig/testmodels.go
@@ -2585,7 +2585,7 @@ func NewTestNotifications() map[string]*gtsmodel.Notification {
 	return map[string]*gtsmodel.Notification{
 		"local_account_1_like": {
 			ID:               "01F8Q0ANPTWW10DAKTX7BRPBJP",
-			NotificationType: gtsmodel.NotificationFave,
+			NotificationType: gtsmodel.NotificationFavourite,
 			CreatedAt:        TimeMustParse("2022-05-14T13:21:09+02:00"),
 			TargetAccountID:  "01F8MH1H7YV1Z7D2C8K2730QBF",
 			OriginAccountID:  "01F8MH17FWEB39HZJ76B6VXSKF",
@@ -2594,7 +2594,7 @@ func NewTestNotifications() map[string]*gtsmodel.Notification {
 		},
 		"local_account_2_like": {
 			ID:               "01GTS6PRPXJYZBPFFQ56PP0XR8",
-			NotificationType: gtsmodel.NotificationFave,
+			NotificationType: gtsmodel.NotificationFavourite,
 			CreatedAt:        TimeMustParse("2022-01-13T12:45:01+02:00"),
 			TargetAccountID:  "01F8MH17FWEB39HZJ76B6VXSKF",
 			OriginAccountID:  "01F8MH5NBDF2MV7CTC4Q5128HF",
@@ -2603,7 +2603,7 @@ func NewTestNotifications() map[string]*gtsmodel.Notification {
 		},
 		"new_signup": {
 			ID:               "01HTM9TETMB3YQCBKZ7KD4KV02",
-			NotificationType: gtsmodel.NotificationSignup,
+			NotificationType: gtsmodel.NotificationAdminSignup,
 			CreatedAt:        TimeMustParse("2022-06-04T13:12:00Z"),
 			TargetAccountID:  "01F8MH17FWEB39HZJ76B6VXSKF",
 			OriginAccountID:  "01F8MH0BBE4FHXPH513MBVFHB0",
@@ -3586,6 +3586,34 @@ func NewTestUserMutes() map[string]*gtsmodel.UserMute {
 	return map[string]*gtsmodel.UserMute{}
 }
 
+func NewTestWebPushSubscriptions() map[string]*gtsmodel.WebPushSubscription {
+	return map[string]*gtsmodel.WebPushSubscription{
+		"local_account_1_token_1": {
+			ID:        "01G65Z755AFWAKHE12NY0CQ9FH",
+			AccountID: "01F8MH1H7YV1Z7D2C8K2730QBF",
+			TokenID:   "01F8MGTQW4DKTDF8SW5CT9HYGA",
+			Endpoint:  "https://example.test/push",
+			Auth:      "cgna/fzrYLDQyPf5hD7IsA==",
+			P256dh:    "BMYVItYVOX+AHBdtA62Q0i6c+F7MV2Gia3aoDr8mvHkuPBNIOuTLDfmFcnBqoZcQk6BtLcIONbxhHpy2R+mYIUY=",
+			NotificationFlags: gtsmodel.WebPushSubscriptionNotificationFlagsFromSlice([]gtsmodel.NotificationType{
+				gtsmodel.NotificationFollow,
+				gtsmodel.NotificationFollowRequest,
+				gtsmodel.NotificationFavourite,
+				gtsmodel.NotificationMention,
+				gtsmodel.NotificationReblog,
+				gtsmodel.NotificationPoll,
+				gtsmodel.NotificationStatus,
+				gtsmodel.NotificationUpdate,
+				gtsmodel.NotificationAdminSignup,
+				gtsmodel.NotificationAdminReport,
+				gtsmodel.NotificationPendingFave,
+				gtsmodel.NotificationPendingReply,
+				gtsmodel.NotificationPendingReblog,
+			}),
+		},
+	}
+}
+
 func NewTestInteractionRequests() map[string]*gtsmodel.InteractionRequest {
 	return map[string]*gtsmodel.InteractionRequest{
 		"admin_account_reply_turtle": {