added admin settings service and api; made filesystem paths configurable; added babel config; added admin settings webpack config

lib/Service/SettingsService.php

@@ -0,0 +1,42 @@
+<?php
+
+declare(strict_types=1);
+
+namespace OCA\GroupfolderFilesystemSnapshots\Service;
+
+use OCA\GroupfolderFilesystemSnapshots\AppInfo\Application;
+use OCP\IConfig;
+
+class SettingsService {
+
+	private static array $VALID_APP_SETTINGS = ["filesystem_mountpoint_path", "filesystem_snapshots_path"];
+	
+	public function __construct(private IConfig $config) {
+	}
+
+	public function getAppValues(): array {
+		$result = [];
+		foreach(self::$VALID_APP_SETTINGS as $key) {
+			$result[$key] = $this->config->getAppValue(Application::APP_ID, $key);
+		}
+		return $result;
+	}
+
+	public function getAppValue(string $key): string {
+		if(in_array($key, self::$VALID_APP_SETTINGS)) {
+			return $this->config->getAppValue(Application::APP_ID, $key);
+		}
+	}
+
+    public function setAppValue(string $key, string $value): string {
+		if(in_array($key, self::$VALID_APP_SETTINGS)) {
+			if($value !== '') {
+				$this->config->setAppValue(Application::APP_ID, $key, $value);
+			} else {
+				$this->config->deleteAppValue(Application::APP_ID, $key);
+			}
+
+			return $value;
+		}
+    }
+}