[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

2 files changed, 25 insertions, 15 deletions

diff --git a/cmd/gotosocial/action/server/server.go b/cmd/gotosocial/action/server/server.go
index efedda9ec..7a374fbcd 100644
--- a/cmd/gotosocial/action/server/server.go
+++ b/cmd/gotosocial/action/server/server.go
@@ -36,37 +36,37 @@ import (
 	"github.com/superseriousbusiness/gotosocial/internal/api"
 	apiutil "github.com/superseriousbusiness/gotosocial/internal/api/util"
 	"github.com/superseriousbusiness/gotosocial/internal/cleaner"
-	"github.com/superseriousbusiness/gotosocial/internal/filter/interaction"
-	"github.com/superseriousbusiness/gotosocial/internal/filter/spam"
-	"github.com/superseriousbusiness/gotosocial/internal/filter/visibility"
-	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
-	"github.com/superseriousbusiness/gotosocial/internal/media/ffmpeg"
-	"github.com/superseriousbusiness/gotosocial/internal/messages"
-	"github.com/superseriousbusiness/gotosocial/internal/metrics"
-	"github.com/superseriousbusiness/gotosocial/internal/middleware"
-	tlprocessor "github.com/superseriousbusiness/gotosocial/internal/processing/timeline"
-	"github.com/superseriousbusiness/gotosocial/internal/subscriptions"
-	"github.com/superseriousbusiness/gotosocial/internal/timeline"
-	"github.com/superseriousbusiness/gotosocial/internal/tracing"
-	"go.uber.org/automaxprocs/maxprocs"
-
 	"github.com/superseriousbusiness/gotosocial/internal/config"
 	"github.com/superseriousbusiness/gotosocial/internal/db/bundb"
 	"github.com/superseriousbusiness/gotosocial/internal/email"
 	"github.com/superseriousbusiness/gotosocial/internal/federation"
 	"github.com/superseriousbusiness/gotosocial/internal/federation/federatingdb"
+	"github.com/superseriousbusiness/gotosocial/internal/filter/interaction"
+	"github.com/superseriousbusiness/gotosocial/internal/filter/spam"
+	"github.com/superseriousbusiness/gotosocial/internal/filter/visibility"
+	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
 	"github.com/superseriousbusiness/gotosocial/internal/httpclient"
 	"github.com/superseriousbusiness/gotosocial/internal/log"
 	"github.com/superseriousbusiness/gotosocial/internal/media"
+	"github.com/superseriousbusiness/gotosocial/internal/media/ffmpeg"
+	"github.com/superseriousbusiness/gotosocial/internal/messages"
+	"github.com/superseriousbusiness/gotosocial/internal/metrics"
+	"github.com/superseriousbusiness/gotosocial/internal/middleware"
 	"github.com/superseriousbusiness/gotosocial/internal/oauth"
 	"github.com/superseriousbusiness/gotosocial/internal/oidc"
 	"github.com/superseriousbusiness/gotosocial/internal/processing"
+	tlprocessor "github.com/superseriousbusiness/gotosocial/internal/processing/timeline"
 	"github.com/superseriousbusiness/gotosocial/internal/router"
 	"github.com/superseriousbusiness/gotosocial/internal/state"
 	gtsstorage "github.com/superseriousbusiness/gotosocial/internal/storage"
+	"github.com/superseriousbusiness/gotosocial/internal/subscriptions"
+	"github.com/superseriousbusiness/gotosocial/internal/timeline"
+	"github.com/superseriousbusiness/gotosocial/internal/tracing"
 	"github.com/superseriousbusiness/gotosocial/internal/transport"
 	"github.com/superseriousbusiness/gotosocial/internal/typeutils"
 	"github.com/superseriousbusiness/gotosocial/internal/web"
+	"github.com/superseriousbusiness/gotosocial/internal/webpush"
+	"go.uber.org/automaxprocs/maxprocs"
 )
 
 // Start creates and starts a gotosocial server
@@ -248,6 +248,14 @@ var Start action.GTSAction = func(ctx context.Context) error {
 		}
 	}
 
+	// Get or create a VAPID key pair.
+	if _, err := dbService.GetVAPIDKeyPair(ctx); err != nil {
+		return gtserror.Newf("error getting or creating VAPID key pair: %w", err)
+	}
+
+	// Create a Web Push notification sender.
+	webPushSender := webpush.NewSender(client, state, typeConverter)
+
 	// Initialize both home / list timelines.
 	state.Timelines.Home = timeline.NewManager(
 		tlprocessor.HomeTimelineGrab(state),
@@ -307,6 +315,7 @@ var Start action.GTSAction = func(ctx context.Context) error {
 		mediaManager,
 		state,
 		emailSender,
+		webPushSender,
 		visFilter,
 		intFilter,
 	)
diff --git a/cmd/gotosocial/action/testrig/testrig.go b/cmd/gotosocial/action/testrig/testrig.go
index 0036b7a7d..d91758767 100644
--- a/cmd/gotosocial/action/testrig/testrig.go
+++ b/cmd/gotosocial/action/testrig/testrig.go
@@ -164,6 +164,7 @@ var Start action.GTSAction = func(ctx context.Context) error {
 	federator := testrig.NewTestFederator(state, transportController, mediaManager)
 
 	emailSender := testrig.NewEmailSender("./web/template/", nil)
+	webPushSender := testrig.NewWebPushMockSender()
 	typeConverter := typeutils.NewConverter(state)
 	filter := visibility.NewFilter(state)
 
@@ -187,7 +188,7 @@ var Start action.GTSAction = func(ctx context.Context) error {
 		return fmt.Errorf("error starting list timeline: %s", err)
 	}
 
-	processor := testrig.NewTestProcessor(state, federator, emailSender, mediaManager)
+	processor := testrig.NewTestProcessor(state, federator, emailSender, webPushSender, mediaManager)
 
 	// Initialize workers.
 	testrig.StartWorkers(state, processor.Workers())