[FEATURE] Blind the Solr Cell crendetials in TYPO3 configuration tools

This change hides/blinds the Apache Solr username and password.
It is the follow up of #212, which introduces the username and password for Apache Solr connection.
It prevents the users from
accidental release of secrets and credentials via TYPO3 backend configuration Tools like:
* Extension Settings module
* Configuration module


Relates: #212

Classes/Lowlevel/EventListener/BlindedSecrets.php

@@ -0,0 +1,67 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * This file is part of the TYPO3 CMS project.
+ *
+ * It is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License, either version 2
+ * of the License, or any later version.
+ *
+ * For the full copyright and license information, please read the
+ * LICENSE.txt file that was distributed with this source code.
+ *
+ * The TYPO3 project - inspiring people to share!
+ */
+
+namespace ApacheSolrForTypo3\Tika\Lowlevel\EventListener;
+
+use TYPO3\CMS\Lowlevel\Event\ModifyBlindedConfigurationOptionsEvent;
+
+use function str_contains;
+
+class BlindedSecrets
+{
+    public function __invoke(ModifyBlindedConfigurationOptionsEvent $event): void
+    {
+        $options = $event->getBlindedConfigurationOptions();
+
+        if ($event->getProviderIdentifier() === 'confVars') {
+            if (!empty($GLOBALS['TYPO3_CONF_VARS']['EXTENSIONS']['tika']['solrUsername'])
+                && !str_contains($GLOBALS['TYPO3_CONF_VARS']['EXTENSIONS']['tika']['solrUsername'], '%env(')
+            ) {
+                $options['TYPO3_CONF_VARS']['EXTENSIONS']['tika']['solrUsername'] = '***';
+            }
+            if (!empty($GLOBALS['TYPO3_CONF_VARS']['EXTENSIONS']['tika']['solrPassword'])
+                && !str_contains($GLOBALS['TYPO3_CONF_VARS']['EXTENSIONS']['tika']['solrPassword'], '%env(')
+            ) {
+                $options['TYPO3_CONF_VARS']['EXTENSIONS']['tika']['solrPassword'] = '***';
+            }
+        }
+
+        $event->setBlindedConfigurationOptions($options);
+    }
+
+    /**
+     * Renders a single secret/credentials input field in BE -> Settings -> Extension Configuration -> tika
+     * dependent on configured/saved value.
+     * * \<input ... type="password"> for simple string, which masks the password in browser
+     * * \<input ... type="text"> for values %env(SOME_SOLR_CREDENTIAL)%, which prints the value as is
+     *
+     * @noinspection PhpUnused
+     */
+    public function hideInExtConf(array $params): string
+    {
+        $currentConfigValue = $GLOBALS['TYPO3_CONF_VARS']['EXTENSIONS']['tika'][$params['fieldName']] ?? '';
+        $inputType = 'password';
+        if (empty($currentConfigValue)
+            || str_contains($currentConfigValue, '%env(')
+        ) {
+            $inputType = 'text';
+        }
+
+        return /* @lang HTML */
+            "<input class='form-control' id='em-tika-{$params['fieldName']}' type='$inputType' name='{$params['fieldName']}' value='$currentConfigValue'>";
+    }
+}

Configuration/Services.yaml

@@ -12,3 +12,9 @@ services:
     public: true
     autowire: true
     tags: ['backend.controller']
+
+  ApacheSolrForTypo3\Tika\Lowlevel\EventListener\BlindedSecrets:
+    tags:
+      - name: event.listener
+        identifier: 'tika/blind-secrets-for-tika'
+        event: 'TYPO3\CMS\Lowlevel\Event\ModifyBlindedConfigurationOptionsEvent'

composer.json

@@ -39,6 +39,7 @@
     "phpstan/phpstan": "^1.10",
     "phpstan/phpstan-phpunit": "^1.3",
     "phpunit/phpunit": "^9.5",
+    "typo3/cms-lowlevel": "*",
     "typo3/coding-standards": "~0.7.1",
     "typo3/testing-framework": "^7.0.2"
   },