add migration to uniformly change the label column to a length of 2048

Signed-off-by: binsky <timo@binsky.org>

lib/Migration/Version020311Date20210831180132.php

@@ -0,0 +1,57 @@
+<?php
+
+declare(strict_types=1);
+
+namespace OCA\Passman\Migration;
+
+use Closure;
+use Doctrine\DBAL\Types\Type;
+use OCP\DB\ISchemaWrapper;
+use OCP\Migration\IOutput;
+use OCP\Migration\SimpleMigrationStep;
+
+/**
+ * Auto-generated migration step: Please modify to your needs!
+ */
+class Version020311Date20210831180132 extends SimpleMigrationStep {
+
+	/**
+	 * @param IOutput $output
+	 * @param Closure $schemaClosure The `\Closure` returns a `ISchemaWrapper`
+	 * @param array $options
+	 */
+	public function preSchemaChange(IOutput $output, Closure $schemaClosure, array $options): void {
+	}
+
+	/**
+	 * @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): ?ISchemaWrapper {
+		/** @var ISchemaWrapper $schema */
+		$schema = $schemaClosure();
+
+		if ($schema->hasTable('passman_credentials')) {
+			$table = $schema->getTable('passman_credentials');
+			$labelColumn = $table->getColumn('label');
+			if ($labelColumn->getLength() < 2048 || $labelColumn->getType() !== Type::getType('string')) {
+				$table->changeColumn('label', [
+					'type' => Type::getType('string'),
+					'length' => 2048
+				]);
+			}
+		}
+
+		return $schema;
+	}
+
+	/**
+	 * @param IOutput $output
+	 * @param Closure $schemaClosure The `\Closure` returns a `ISchemaWrapper`
+	 * @param array $options
+	 */
+	public function postSchemaChange(IOutput $output, Closure $schemaClosure, array $options): void {
+	}
+}