Single-row table for storing instance's VAPID key pair

internal/db/admin.go

@@ -68,6 +68,10 @@ type Admin interface {
 	// the number of pending sign-ups sitting in the backlog.
 	CountUnhandledSignups(ctx context.Context) (int, error)
 
+	// GetOrCreateVAPIDKeyPair creates and stores a VAPID key pair,
+	// or retrieves the existing VAPID key pair.
+	GetOrCreateVAPIDKeyPair(ctx context.Context) (*gtsmodel.VAPIDKeyPair, error)
+
 	/*
 		ACTION FUNCS
 	*/

internal/db/bundb/admin.go

@@ -27,6 +27,7 @@ import (
 	"strings"
 	"time"
 
+	webpushgo "github.com/SherClockHolmes/webpush-go"
 	"github.com/google/uuid"
 	"github.com/superseriousbusiness/gotosocial/internal/ap"
 	"github.com/superseriousbusiness/gotosocial/internal/config"
@@ -442,6 +443,38 @@ func (a *adminDB) CountUnhandledSignups(ctx context.Context) (int, error) {
 		Count(ctx)
 }
 
+func (a *adminDB) GetOrCreateVAPIDKeyPair(ctx context.Context) (*gtsmodel.VAPIDKeyPair, error) {
+	var err error
+	var vapidKeyPair *gtsmodel.VAPIDKeyPair
+
+	// Look for previously generated keys.
+	if err = a.db.NewSelect().
+		Model(vapidKeyPair).
+		Limit(1).
+		Scan(ctx); // nocollapse
+	err != nil && !errors.Is(err, db.ErrNoEntries) {
+		return nil, gtserror.Newf("DB error getting VAPID key pair: %w", err)
+	}
+
+	if vapidKeyPair == nil {
+		// Generate new keys.
+		vapidKeyPair = &gtsmodel.VAPIDKeyPair{}
+		if vapidKeyPair.Private, vapidKeyPair.Public, err = webpushgo.GenerateVAPIDKeys(); err != nil {
+			return nil, gtserror.Newf("error generating VAPID key pair: %w", err)
+		}
+
+		// Save them to the database.
+		if _, err = a.db.NewInsert().
+			Model(vapidKeyPair).
+			Exec(ctx); // nocollapse
+		err != nil {
+			return nil, gtserror.Newf("DB error saving VAPID key pair: %w", err)
+		}
+	}
+
+	return vapidKeyPair, err
+}
+
 /*
 	ACTION FUNCS
 */

internal/db/bundb/migrations/20241124012635_add_vapid_key_pairs.go

@@ -0,0 +1,51 @@
+// 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 migrations
+
+import (
+	"context"
+
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+	"github.com/uptrace/bun"
+)
+
+func init() {
+	up := func(ctx context.Context, db *bun.DB) error {
+		return db.RunInTx(ctx, nil, func(ctx context.Context, tx bun.Tx) error {
+			if _, err := tx.
+				NewCreateTable().
+				Model(&gtsmodel.VAPIDKeyPair{}).
+				IfNotExists().
+				Exec(ctx); err != nil {
+				return err
+			}
+
+			return nil
+		})
+	}
+
+	down := func(ctx context.Context, db *bun.DB) error {
+		return db.RunInTx(ctx, nil, func(ctx context.Context, tx bun.Tx) error {
+			return nil
+		})
+	}
+
+	if err := Migrations.Register(up, down); err != nil {
+		panic(err)
+	}
+}

internal/gtsmodel/vapidkeypair.go

@@ -0,0 +1,28 @@
+// 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 gtsmodel
+
+// VAPIDKeyPair represents the instance's VAPID keys (stored as Base64 strings).
+// This table should only ever have one entry, with a known ID of 0.
+//
+// See: https://datatracker.ietf.org/doc/html/rfc8292
+type VAPIDKeyPair struct {
+	ID      int    `bun:"pk,notnull"`
+	Public  string `bun:"notnull,nullzero"`
+	Private string `bun:"notnull,nullzero"`
+}