Nextcloud added import RainLoop data helper for

https://github.com/pierre-alain-b/rainloop-nextcloud/issues/288

integrations/nextcloud/snappymail/lib/Util/SnappyMailHelper.php

@@ -119,4 +119,43 @@ class SnappyMailHelper
 		static::loadApp();
 		return \SnappyMail\Crypt::DecryptUrlSafe($sPassword, $sSalt);
 	}
+
+	public static function importRainloop() : bool
+	{
+		$dir = \rtrim(\trim(\OC::$server->getSystemConfig()->getValue('datadirectory', '')), '\\/');
+
+		$dir_snappy = $dir . '/appdata_snappymail/';
+		\is_dir($dir_snappy) || \mkdir($dir);
+
+		$dir_rainloop = $dir . '/rainloop-storage';
+		if (\is_dir($dir_rainloop)) {
+			$plugins = [];
+			$iterator = new \RecursiveIteratorIterator(
+				new \RecursiveDirectoryIterator($dir_rainloop, \RecursiveDirectoryIterator::SKIP_DOTS),
+				\RecursiveIteratorIterator::SELF_FIRST
+			);
+			foreach ($iterator as $item) {
+				$target = $dir_snappy . DIRECTORY_SEPARATOR . $iterator->getSubPathname();
+				if (\preg_match('@/plugins/([^/])@', $target, $match)) {
+					$plugins[$match[1]] = $match[1];
+				} else if (!\strpos($target, '/cache/')) {
+					if ($item->isDir()) {
+						\mkdir($target);
+					} else {
+						\copy($item, $target);
+					}
+				}
+			}
+
+			static::loadApp();
+			foreach (\SnappyMail\Repository::getPackagesList()['List'] as $plugin) {
+				if (\in_array($plugin['id'], $plugins)) {
+					\SnappyMail\Repository::installPackage('plugin', $plugin['id']);
+				}
+			}
+
+			return true;
+		}
+		return false;
+	}
 }