[feature] Application creation + management via API + settings panel (#3906)

* [feature] Application creation + management via API + settings panel

* fix docs links

* add errnorows test

* use known application as shorter

* add comment about side effects

1 files changed, 105 insertions, 0 deletions

diff --git a/internal/db/bundb/migrations/20250310144102_application_management.go b/internal/db/bundb/migrations/20250310144102_application_management.go
new file mode 100644
index 000000000..46ff9926b
--- /dev/null
+++ b/internal/db/bundb/migrations/20250310144102_application_management.go
@@ -0,0 +1,105 @@
+// 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/config"
+	"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 {
+			// Add client_id index to token table,
+			// needed for invalidation if/when the
+			// token's app is deleted.
+			if _, err := tx.
+				NewCreateIndex().
+				Table("tokens").
+				Index("tokens_client_id_idx").
+				Column("client_id").
+				IfNotExists().
+				Exec(ctx); err != nil {
+				return err
+			}
+
+			// Update users to set all "created_by_application_id"
+			// values to the instance application, to correct some
+			// past issues where this wasn't set. Skip this if there's
+			// no users though, as in that case we probably don't even
+			// have an instance application yet.
+			usersLen, err := tx.
+				NewSelect().
+				Table("users").
+				Count(ctx)
+			if err != nil {
+				return err
+			}
+
+			if usersLen == 0 {
+				// Nothing to do.
+				return nil
+			}
+
+			// Get Instance account ID.
+			var instanceAcctID string
+			if err := tx.
+				NewSelect().
+				Table("accounts").
+				Column("id").
+				Where("? = ?", bun.Ident("username"), config.GetHost()).
+				Where("? IS NULL", bun.Ident("domain")).
+				Scan(ctx, &instanceAcctID); err != nil {
+				return err
+			}
+
+			// Get the instance app ID.
+			var instanceAppID string
+			if err := tx.
+				NewSelect().
+				Table("applications").
+				Column("id").
+				Where("? = ?", bun.Ident("client_id"), instanceAcctID).
+				Scan(ctx, &instanceAppID); err != nil {
+				return err
+			}
+
+			// Set instance app
+			// ID on all users.
+			if _, err := tx.
+				NewUpdate().
+				Table("users").
+				Set("? = ?", bun.Ident("created_by_application_id"), instanceAppID).
+				Exec(ctx); err != nil {
+				return err
+			}
+
+			return nil
+		})
+	}
+
+	down := func(ctx context.Context, db *bun.DB) error {
+		return nil
+	}
+
+	if err := Migrations.Register(up, down); err != nil {
+		panic(err)
+	}
+}