[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, 13 insertions, 0 deletions

diff --git a/testrig/db.go b/testrig/db.go
index e53e9c9f0..d33a63f12 100644
--- a/testrig/db.go
+++ b/testrig/db.go
@@ -61,6 +61,8 @@ var testModels = []interface{}{
 	&gtsmodel.ThreadToStatus{},
 	&gtsmodel.User{},
 	&gtsmodel.UserMute{},
+	&gtsmodel.VAPIDKeyPair{},
+	&gtsmodel.WebPushSubscription{},
 	&gtsmodel.Emoji{},
 	&gtsmodel.Instance{},
 	&gtsmodel.Notification{},
@@ -348,6 +350,12 @@ func StandardDBSetup(db db.DB, accounts map[string]*gtsmodel.Account) {
 		}
 	}
 
+	for _, v := range NewTestWebPushSubscriptions() {
+		if err := db.Put(ctx, v); err != nil {
+			log.Panic(nil, err)
+		}
+	}
+
 	for _, v := range NewTestInteractionRequests() {
 		if err := db.Put(ctx, v); err != nil {
 			log.Panic(ctx, err)
@@ -368,6 +376,11 @@ func StandardDBSetup(db db.DB, accounts map[string]*gtsmodel.Account) {
 		log.Panic(ctx, err)
 	}
 
+	// Generates and stores a VAPID key pair as a side effect.
+	if _, err := db.GetVAPIDKeyPair(ctx); err != nil {
+		log.Panic(nil, err)
+	}
+
 	log.Debug(ctx, "testing db setup complete")
 }