feat(migration): migrate legacy signature_flow policy keys

Signed-off-by: Vitor Mattos <1079143+vitormattos@users.noreply.github.com>

Author: vitormattos

lib/Migration/Version18001Date20260320000000.php

@@ -0,0 +1,54 @@
+<?php
+
+declare(strict_types=1);
+/**
+ * SPDX-FileCopyrightText: 2026 LibreCode coop and contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OCA\Libresign\Migration;
+
+use Closure;
+use OCA\Libresign\AppInfo\Application;
+use OCA\Libresign\Service\Policy\Provider\Signature\SignatureFlowPolicy;
+use OCP\DB\ISchemaWrapper;
+use OCP\IAppConfig;
+use OCP\Migration\IOutput;
+use OCP\Migration\SimpleMigrationStep;
+
+class Version18001Date20260320000000 extends SimpleMigrationStep {
+	private const LEGACY_SYSTEM_KEY = SignatureFlowPolicy::KEY;
+	private const LEGACY_ALLOW_CHILD_OVERRIDE_KEY = SignatureFlowPolicy::KEY . '.allow_child_override';
+	private const SYSTEM_ALLOW_CHILD_OVERRIDE_SUFFIX = '.allow_child_override';
+
+	public function __construct(
+		private IAppConfig $appConfig,
+	) {
+	}
+
+	#[\Override]
+	public function preSchemaChange(IOutput $output, Closure $schemaClosure, array $options): void {
+		$newSystemKey = SignatureFlowPolicy::SYSTEM_APP_CONFIG_KEY;
+		$newAllowChildOverrideKey = $newSystemKey . self::SYSTEM_ALLOW_CHILD_OVERRIDE_SUFFIX;
+
+		$legacySystemValue = $this->appConfig->getValueString(Application::APP_ID, self::LEGACY_SYSTEM_KEY, '');
+		$newSystemValue = $this->appConfig->getValueString(Application::APP_ID, $newSystemKey, '');
+		if ($legacySystemValue !== '' && $newSystemValue === '') {
+			$this->appConfig->setValueString(Application::APP_ID, $newSystemKey, $legacySystemValue);
+		}
+
+		$legacyAllowOverrideValue = $this->appConfig->getValueString(Application::APP_ID, self::LEGACY_ALLOW_CHILD_OVERRIDE_KEY, '');
+		$newAllowOverrideValue = $this->appConfig->getValueString(Application::APP_ID, $newAllowChildOverrideKey, '');
+		if ($legacyAllowOverrideValue !== '' && $newAllowOverrideValue === '') {
+			$this->appConfig->setValueString(Application::APP_ID, $newAllowChildOverrideKey, $legacyAllowOverrideValue);
+		}
+
+		$this->appConfig->deleteKey(Application::APP_ID, self::LEGACY_SYSTEM_KEY);
+		$this->appConfig->deleteKey(Application::APP_ID, self::LEGACY_ALLOW_CHILD_OVERRIDE_KEY);
+	}
+
+	#[\Override]
+	public function changeSchema(IOutput $output, Closure $schemaClosure, array $options): ?ISchemaWrapper {
+		return null;
+	}
+}