[feature] Create/update/remove domain permission subscriptions (#3623)

* [feature] Create/update/remove domain permission subscriptions

* lint

* envparsing

* remove errant fmt.Println

* create drafts, subs, exclude, from snapshot models

* name etag column correctly

* remove count column

* lint

1 files changed, 75 insertions, 0 deletions

diff --git a/internal/db/bundb/migrations/20241022153016_domain_permission_subscriptions.go b/internal/db/bundb/migrations/20241022153016_domain_permission_subscriptions.go
new file mode 100644
index 000000000..7d2bd085c
--- /dev/null
+++ b/internal/db/bundb/migrations/20241022153016_domain_permission_subscriptions.go
@@ -0,0 +1,75 @@
+// 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"
+
+	gtsmodel "github.com/superseriousbusiness/gotosocial/internal/db/bundb/migrations/20241022153016_domain_permission_subscriptions"
+	"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 {
+			// Create `domain_permission_subscriptions`.
+			if _, err := tx.
+				NewCreateTable().
+				Model((*gtsmodel.DomainPermissionSubscription)(nil)).
+				IfNotExists().
+				Exec(ctx); err != nil {
+				return err
+			}
+
+			// Create indexes. Indices. Indie sexes.
+			if _, err := tx.
+				NewCreateIndex().
+				Table("domain_permission_subscriptions").
+				// Filter on permission type.
+				Index("domain_permission_subscriptions_permission_type_idx").
+				Column("permission_type").
+				IfNotExists().
+				Exec(ctx); err != nil {
+				return err
+			}
+
+			if _, err := tx.
+				NewCreateIndex().
+				Table("domain_permission_subscriptions").
+				// Sort by priority DESC.
+				Index("domain_permission_subscriptions_priority_order_idx").
+				ColumnExpr("? DESC", bun.Ident("priority")).
+				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)
+	}
+}