Make "name" column nullable in workflow operations

The "name" column is now unused and the code is always inserting an
empty string. While this works with most databases, Oracle complains
because an empty string is equivalent to null.

To fix this, the column definition is changed to allow null values now.

Also added some logging in case of database exceptions, because without
this nothing would be logged to detect the above problem.

Signed-off-by: Vincent Petry <vincent@nextcloud.com>

7 files changed, 72 insertions, 5 deletions

diff --git a/apps/workflowengine/appinfo/info.xml b/apps/workflowengine/appinfo/info.xml
index 754458c6dc1..96d5c8fa64d 100644
--- a/apps/workflowengine/appinfo/info.xml
+++ b/apps/workflowengine/appinfo/info.xml
@@ -5,7 +5,7 @@
 	<name>Nextcloud workflow engine</name>
 	<summary>Nextcloud workflow engine</summary>
 	<description>Nextcloud workflow engine</description>
-	<version>2.4.0</version>
+	<version>2.4.1</version>
 	<licence>agpl</licence>
 	<author>Arthur Schiwon</author>
 	<author>Julius Härtl</author>
diff --git a/apps/workflowengine/composer/composer/autoload_classmap.php b/apps/workflowengine/composer/composer/autoload_classmap.php
index aaae4a6a0e9..bb60023a02e 100644
--- a/apps/workflowengine/composer/composer/autoload_classmap.php
+++ b/apps/workflowengine/composer/composer/autoload_classmap.php
@@ -32,6 +32,7 @@ return array(
     'OCA\\WorkflowEngine\\Manager' => $baseDir . '/../lib/Manager.php',
     'OCA\\WorkflowEngine\\Migration\\PopulateNewlyIntroducedDatabaseFields' => $baseDir . '/../lib/Migration/PopulateNewlyIntroducedDatabaseFields.php',
     'OCA\\WorkflowEngine\\Migration\\Version2000Date20190808074233' => $baseDir . '/../lib/Migration/Version2000Date20190808074233.php',
+    'OCA\\WorkflowEngine\\Migration\\Version2200Date20210805101925' => $baseDir . '/../lib/Migration/Version2200Date20210805101925.php',
     'OCA\\WorkflowEngine\\Service\\Logger' => $baseDir . '/../lib/Service/Logger.php',
     'OCA\\WorkflowEngine\\Service\\RuleMatcher' => $baseDir . '/../lib/Service/RuleMatcher.php',
     'OCA\\WorkflowEngine\\Settings\\ASettings' => $baseDir . '/../lib/Settings/ASettings.php',
diff --git a/apps/workflowengine/composer/composer/autoload_static.php b/apps/workflowengine/composer/composer/autoload_static.php
index 175e509e032..e867bfa4feb 100644
--- a/apps/workflowengine/composer/composer/autoload_static.php
+++ b/apps/workflowengine/composer/composer/autoload_static.php
@@ -47,6 +47,7 @@ class ComposerStaticInitWorkflowEngine
         'OCA\\WorkflowEngine\\Manager' => __DIR__ . '/..' . '/../lib/Manager.php',
         'OCA\\WorkflowEngine\\Migration\\PopulateNewlyIntroducedDatabaseFields' => __DIR__ . '/..' . '/../lib/Migration/PopulateNewlyIntroducedDatabaseFields.php',
         'OCA\\WorkflowEngine\\Migration\\Version2000Date20190808074233' => __DIR__ . '/..' . '/../lib/Migration/Version2000Date20190808074233.php',
+        'OCA\\WorkflowEngine\\Migration\\Version2200Date20210805101925' => __DIR__ . '/..' . '/../lib/Migration/Version2200Date20210805101925.php',
         'OCA\\WorkflowEngine\\Service\\Logger' => __DIR__ . '/..' . '/../lib/Service/Logger.php',
         'OCA\\WorkflowEngine\\Service\\RuleMatcher' => __DIR__ . '/..' . '/../lib/Service/RuleMatcher.php',
         'OCA\\WorkflowEngine\\Settings\\ASettings' => __DIR__ . '/..' . '/../lib/Settings/ASettings.php',
diff --git a/apps/workflowengine/lib/Controller/AWorkflowController.php b/apps/workflowengine/lib/Controller/AWorkflowController.php
index 39549d3d6e0..77e50526092 100644
--- a/apps/workflowengine/lib/Controller/AWorkflowController.php
+++ b/apps/workflowengine/lib/Controller/AWorkflowController.php
@@ -36,20 +36,26 @@ use OCP\AppFramework\OCS\OCSException;
 use OCP\AppFramework\OCS\OCSForbiddenException;
 use OCP\AppFramework\OCSController;
 use OCP\IRequest;
+use Psr\Log\LoggerInterface;
 
 abstract class AWorkflowController extends OCSController {
 
 	/** @var Manager */
 	protected $manager;
 
+	/** @var LoggerInterface */
+	private $logger;
+
 	public function __construct(
 		$appName,
 		IRequest $request,
-		Manager $manager
+		Manager $manager,
+		LoggerInterface $logger
 	) {
 		parent::__construct($appName, $request);
 
 		$this->manager = $manager;
+		$this->logger = $logger;
 	}
 
 	/**
@@ -115,6 +121,7 @@ abstract class AWorkflowController extends OCSController {
 		} catch (\DomainException $e) {
 			throw new OCSForbiddenException($e->getMessage(), $e);
 		} catch (Exception $e) {
+			$this->logger->error('Error when inserting flow', ['exception' => $e]);
 			throw new OCSException('An internal error occurred', $e->getCode(), $e);
 		}
 	}
@@ -142,6 +149,7 @@ abstract class AWorkflowController extends OCSController {
 		} catch (\DomainException $e) {
 			throw new OCSForbiddenException($e->getMessage(), $e);
 		} catch (Exception $e) {
+			$this->logger->error('Error when updating flow with id ' . $id, ['exception' => $e]);
 			throw new OCSException('An internal error occurred', $e->getCode(), $e);
 		}
 	}
@@ -160,6 +168,7 @@ abstract class AWorkflowController extends OCSController {
 		} catch (\DomainException $e) {
 			throw new OCSForbiddenException($e->getMessage(), $e);
 		} catch (Exception $e) {
+			$this->logger->error('Error when deleting flow with id ' . $id, ['exception' => $e]);
 			throw new OCSException('An internal error occurred', $e->getCode(), $e);
 		}
 	}
diff --git a/apps/workflowengine/lib/Controller/UserWorkflowsController.php b/apps/workflowengine/lib/Controller/UserWorkflowsController.php
index dfb17c17f9b..dd2457dd9e8 100644
--- a/apps/workflowengine/lib/Controller/UserWorkflowsController.php
+++ b/apps/workflowengine/lib/Controller/UserWorkflowsController.php
@@ -35,6 +35,7 @@ use OCP\AppFramework\OCS\OCSForbiddenException;
 use OCP\IRequest;
 use OCP\IUserSession;
 use OCP\WorkflowEngine\IManager;
+use Psr\Log\LoggerInterface;
 
 class UserWorkflowsController extends AWorkflowController {
 
@@ -48,9 +49,10 @@ class UserWorkflowsController extends AWorkflowController {
 		$appName,
 		IRequest $request,
 		Manager $manager,
-		IUserSession $session
+		IUserSession $session,
+		LoggerInterface $logger
 	) {
-		parent::__construct($appName, $request, $manager);
+		parent::__construct($appName, $request, $manager, $logger);
 
 		$this->session = $session;
 	}
diff --git a/apps/workflowengine/lib/Migration/Version2000Date20190808074233.php b/apps/workflowengine/lib/Migration/Version2000Date20190808074233.php
index bfb22665287..351c1aa3fa5 100644
--- a/apps/workflowengine/lib/Migration/Version2000Date20190808074233.php
+++ b/apps/workflowengine/lib/Migration/Version2000Date20190808074233.php
@@ -91,7 +91,7 @@ class Version2000Date20190808074233 extends SimpleMigrationStep {
 				'default' => '',
 			]);
 			$table->addColumn('name', Types::STRING, [
-				'notnull' => true,
+				'notnull' => false,
 				'length' => 256,
 				'default' => '',
 			]);
diff --git a/apps/workflowengine/lib/Migration/Version2200Date20210805101925.php b/apps/workflowengine/lib/Migration/Version2200Date20210805101925.php
new file mode 100644
index 00000000000..9f2049dc611
--- /dev/null
+++ b/apps/workflowengine/lib/Migration/Version2200Date20210805101925.php
@@ -0,0 +1,54 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * @copyright Copyright (c) 2021 Vincent Petry <vincent@nextcloud.com>
+ *
+ * @author Vincent Petry <vincent@nextcloud.com>
+ *
+ * @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 <http://www.gnu.org/licenses/>.
+ *
+ */
+namespace OCA\WorkflowEngine\Migration;
+
+use Closure;
+use OCP\DB\ISchemaWrapper;
+use OCP\Migration\IOutput;
+use OCP\Migration\SimpleMigrationStep;
+
+class Version2200Date20210805101925 extends SimpleMigrationStep {
+
+	/**
+	 * @param IOutput $output
+	 * @param Closure $schemaClosure The `\Closure` returns a `ISchemaWrapper`
+	 * @param array $options
+	 * @return null|ISchemaWrapper
+	 */
+	public function changeSchema(IOutput $output, Closure $schemaClosure, array $options) {
+		/** @var ISchemaWrapper $schema */
+		$schema = $schemaClosure();
+
+		if ($schema->hasTable('flow_operations')) {
+			$table = $schema->getTable('flow_operations');
+			$table->changeColumn('name', [
+				'notnull' => false,
+			]);
+		}
+
+		return $schema;
+	}
+}