Add support for toString/Serializable

src/Core/Config/Util/ConfigFileTransformer.php

@@ -214,6 +214,17 @@ class ConfigFileTransformer
 			case "NULL":
 				return "null";
 			case "object":
+				if (method_exists($value, '__toString')) {
+					return sprintf('\'%s\'', $value);
+				} elseif ($value instanceof \Serializable) {
+					try {
+						return $value->serialize();
+					} catch (\Exception $e) {
+						throw new \InvalidArgumentException(sprintf('Cannot serialize %s.', gettype($value)), $e);
+					}
+				} else {
+					throw new \InvalidArgumentException(sprintf('%s is an object without stringify.', gettype($value)));
+				}
 			case "resource":
 			case "resource (closed)":
 				throw new \InvalidArgumentException(sprintf('%s in configs are not supported yet.', gettype($value)));

tests/Util/SerializableObjectDouble.php

@@ -0,0 +1,35 @@
+<?php
+/**
+ * @copyright Copyright (C) 2010-2023, the Friendica project
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * 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 <https://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace Friendica\Test\Util;
+
+class SerializableObjectDouble implements \Serializable#
+{
+	public function serialize()
+	{
+		return '\'serialized\'';
+	}
+
+	public function unserialize($data)
+	{
+		return '\'unserialized\'';
+	}
+}

tests/datasets/config/transformer/object_valid.node.config.php

@@ -0,0 +1,11 @@
+<?php
+
+use Friendica\Test\Util\SerializableObjectDouble;
+use ParagonIE\HiddenString\HiddenString;
+
+return [
+	'object' => [
+		'toString' => new HiddenString('test'),
+		'serializable' => new SerializableObjectDouble(),
+	],
+];

tests/src/Core/Config/Util/ConfigFileTransformerTest.php

@@ -23,6 +23,9 @@ namespace Friendica\Test\src\Core\Config\Util;
 
 use Friendica\Core\Config\Util\ConfigFileTransformer;
 use Friendica\Test\MockedTest;
+use Friendica\Test\Util\SerializableObjectDouble;
+use ParagonIE\HiddenString\HiddenString;
+use function PHPUnit\Framework\assertEquals;
 
 class ConfigFileTransformerTest extends MockedTest
 {
@@ -45,9 +48,34 @@ class ConfigFileTransformerTest extends MockedTest
 				'configFile' => (dirname(__DIR__, 4) . '/datasets/config/transformer/object.node.config.php'),
 				'assertException' => true,
 			],
-			'ressource_invalid' => [
+			'ressource' => [
 				'configFile' => (dirname(__DIR__, 4) . '/datasets/config/transformer/ressource.node.config.php'),
-				'assertException' => true,
+				'assertException' => false,
+				'assertion' => <<<EOF
+<?php
+
+return [
+	'ressource' => [
+		'ressources_not_allowed' => '',
+	],
+];
+
+EOF,
+			],
+			'object_valid' => [
+				'configFile' => (dirname(__DIR__, 4) . '/datasets/config/transformer/object_valid.node.config.php'),
+				'assertException' => false,
+				'assertion' => <<<EOF
+<?php
+
+return [
+	'object' => [
+		'toString' => 'test',
+		'serializable' => 'serialized',
+	],
+];
+
+EOF,
 			],
 			'test_types' => [
 				'configFile' => (dirname(__DIR__, 4) . '/datasets/config/transformer/types.node.config.php'),
@@ -63,7 +91,7 @@ class ConfigFileTransformerTest extends MockedTest
 	 *
 	 * @dataProvider dataTests
 	 */
-	public function testConfigFile(string $configFile, bool $assertException = false)
+	public function testConfigFile(string $configFile, bool $assertException = false, $assertion = null)
 	{
 		$dataArray = include $configFile;
 
@@ -73,6 +101,10 @@ class ConfigFileTransformerTest extends MockedTest
 
 		$newConfig = ConfigFileTransformer::encode($dataArray);
 
-		self::assertEquals(file_get_contents($configFile), $newConfig);
+		if (empty($assertion)) {
+			self::assertEquals(file_get_contents($configFile), $newConfig);
+		} else {
+			self::assertEquals($assertion, $newConfig);
+		}
 	}
 }