Added an setting to disable password reset mechanism.

By default the pw reset is disabled, when no email server is configured.

src/Services/CustomEnvVarProcessor.php

@@ -0,0 +1,55 @@
+<?php
+/**
+ * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
+ *
+ * Copyright (C) 2019 Jan Böhmer (https://github.com/jbtronics)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ */
+
+namespace App\Services;
+
+
+use Symfony\Component\DependencyInjection\EnvVarProcessorInterface;
+use Symfony\Component\DependencyInjection\Exception\EnvNotFoundException;
+
+class CustomEnvVarProcessor implements EnvVarProcessorInterface
+{
+
+    /**
+     * @inheritDoc
+     */
+    public function getEnv($prefix, $name, \Closure $getEnv)
+    {
+        if ('validMailDSN' === $prefix) {
+            try {
+                $env = $getEnv($name);
+                return !empty($env)  && $env !== 'null://null';
+            } catch (EnvNotFoundException $exception) {
+                return false;
+            }
+        }
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public static function getProvidedTypes()
+    {
+        return [
+            'validMailDSN' => 'bool',
+        ];
+    }
+}