diff --git a/composer.json b/composer.json
index 1e403960..831cc479 100644
--- a/composer.json
+++ b/composer.json
@@ -36,5 +36,8 @@
 		"psr-4": {
 			"OCP\\": "vendor/nextcloud/ocp/OCP"
 		}
+	},
+	"require": {
+		"sabre/dav": "^4.5"
 	}
 }
diff --git a/composer.lock b/composer.lock
index c2a60c37..55e8182b 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,8 +4,504 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "5fc5c2ff5280acdfb59ce3599cfaaa5b",
-    "packages": [],
+    "content-hash": "0cea5f90d52e1ea5c65da17df460f72b",
+    "packages": [
+        {
+            "name": "psr/log",
+            "version": "1.1.4",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/php-fig/log.git",
+                "reference": "d49695b909c3b7628b6289db5479a1c204601f11"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/php-fig/log/zipball/d49695b909c3b7628b6289db5479a1c204601f11",
+                "reference": "d49695b909c3b7628b6289db5479a1c204601f11",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.1.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Psr\\Log\\": "Psr/Log/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "PHP-FIG",
+                    "homepage": "https://www.php-fig.org/"
+                }
+            ],
+            "description": "Common interface for logging libraries",
+            "homepage": "https://github.com/php-fig/log",
+            "keywords": [
+                "log",
+                "psr",
+                "psr-3"
+            ],
+            "support": {
+                "source": "https://github.com/php-fig/log/tree/1.1.4"
+            },
+            "time": "2021-05-03T11:20:27+00:00"
+        },
+        {
+            "name": "sabre/dav",
+            "version": "4.5.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sabre-io/dav.git",
+                "reference": "b29899b675371aee73920165d1dc5a2235aa104b"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sabre-io/dav/zipball/b29899b675371aee73920165d1dc5a2235aa104b",
+                "reference": "b29899b675371aee73920165d1dc5a2235aa104b",
+                "shasum": ""
+            },
+            "require": {
+                "ext-ctype": "*",
+                "ext-date": "*",
+                "ext-dom": "*",
+                "ext-iconv": "*",
+                "ext-json": "*",
+                "ext-mbstring": "*",
+                "ext-pcre": "*",
+                "ext-simplexml": "*",
+                "ext-spl": "*",
+                "lib-libxml": ">=2.7.0",
+                "php": "^7.1.0 || ^8.0",
+                "psr/log": "^1.0 || ^2.0 || ^3.0",
+                "sabre/event": "^5.0",
+                "sabre/http": "^5.0.5",
+                "sabre/uri": "^2.0",
+                "sabre/vobject": "^4.2.1",
+                "sabre/xml": "^2.0.1"
+            },
+            "require-dev": {
+                "friendsofphp/php-cs-fixer": "^2.19",
+                "monolog/monolog": "^1.27",
+                "phpstan/phpstan": "^0.12 || ^1.0",
+                "phpstan/phpstan-phpunit": "^1.0",
+                "phpunit/phpunit": "^7.5 || ^8.5 || ^9.6"
+            },
+            "suggest": {
+                "ext-curl": "*",
+                "ext-imap": "*",
+                "ext-pdo": "*"
+            },
+            "bin": [
+                "bin/sabredav",
+                "bin/naturalselection"
+            ],
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "Sabre\\": "lib/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Evert Pot",
+                    "email": "me@evertpot.com",
+                    "homepage": "http://evertpot.com/",
+                    "role": "Developer"
+                }
+            ],
+            "description": "WebDAV Framework for PHP",
+            "homepage": "http://sabre.io/",
+            "keywords": [
+                "CalDAV",
+                "CardDAV",
+                "WebDAV",
+                "framework",
+                "iCalendar"
+            ],
+            "support": {
+                "forum": "https://groups.google.com/group/sabredav-discuss",
+                "issues": "https://github.com/sabre-io/dav/issues",
+                "source": "https://github.com/fruux/sabre-dav"
+            },
+            "time": "2023-11-23T04:33:31+00:00"
+        },
+        {
+            "name": "sabre/event",
+            "version": "5.1.4",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sabre-io/event.git",
+                "reference": "d7da22897125d34d7eddf7977758191c06a74497"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sabre-io/event/zipball/d7da22897125d34d7eddf7977758191c06a74497",
+                "reference": "d7da22897125d34d7eddf7977758191c06a74497",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.1 || ^8.0"
+            },
+            "require-dev": {
+                "friendsofphp/php-cs-fixer": "~2.17.1",
+                "phpstan/phpstan": "^0.12",
+                "phpunit/phpunit": "^7.5 || ^8.5 || ^9.0"
+            },
+            "type": "library",
+            "autoload": {
+                "files": [
+                    "lib/coroutine.php",
+                    "lib/Loop/functions.php",
+                    "lib/Promise/functions.php"
+                ],
+                "psr-4": {
+                    "Sabre\\Event\\": "lib/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Evert Pot",
+                    "email": "me@evertpot.com",
+                    "homepage": "http://evertpot.com/",
+                    "role": "Developer"
+                }
+            ],
+            "description": "sabre/event is a library for lightweight event-based programming",
+            "homepage": "http://sabre.io/event/",
+            "keywords": [
+                "EventEmitter",
+                "async",
+                "coroutine",
+                "eventloop",
+                "events",
+                "hooks",
+                "plugin",
+                "promise",
+                "reactor",
+                "signal"
+            ],
+            "support": {
+                "forum": "https://groups.google.com/group/sabredav-discuss",
+                "issues": "https://github.com/sabre-io/event/issues",
+                "source": "https://github.com/fruux/sabre-event"
+            },
+            "time": "2021-11-04T06:51:17+00:00"
+        },
+        {
+            "name": "sabre/http",
+            "version": "5.1.10",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sabre-io/http.git",
+                "reference": "f9f3d1fba8916fa2f4ec25636c4fedc26cb94e02"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sabre-io/http/zipball/f9f3d1fba8916fa2f4ec25636c4fedc26cb94e02",
+                "reference": "f9f3d1fba8916fa2f4ec25636c4fedc26cb94e02",
+                "shasum": ""
+            },
+            "require": {
+                "ext-ctype": "*",
+                "ext-curl": "*",
+                "ext-mbstring": "*",
+                "php": "^7.1 || ^8.0",
+                "sabre/event": ">=4.0 <6.0",
+                "sabre/uri": "^2.0"
+            },
+            "require-dev": {
+                "friendsofphp/php-cs-fixer": "~2.17.1",
+                "phpstan/phpstan": "^0.12",
+                "phpunit/phpunit": "^7.5 || ^8.5 || ^9.0"
+            },
+            "suggest": {
+                "ext-curl": " to make http requests with the Client class"
+            },
+            "type": "library",
+            "autoload": {
+                "files": [
+                    "lib/functions.php"
+                ],
+                "psr-4": {
+                    "Sabre\\HTTP\\": "lib/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Evert Pot",
+                    "email": "me@evertpot.com",
+                    "homepage": "http://evertpot.com/",
+                    "role": "Developer"
+                }
+            ],
+            "description": "The sabre/http library provides utilities for dealing with http requests and responses. ",
+            "homepage": "https://github.com/fruux/sabre-http",
+            "keywords": [
+                "http"
+            ],
+            "support": {
+                "forum": "https://groups.google.com/group/sabredav-discuss",
+                "issues": "https://github.com/sabre-io/http/issues",
+                "source": "https://github.com/fruux/sabre-http"
+            },
+            "time": "2023-08-18T01:55:28+00:00"
+        },
+        {
+            "name": "sabre/uri",
+            "version": "2.3.3",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sabre-io/uri.git",
+                "reference": "7e0e7dfd0b7e14346a27eabd66e843a6e7f1812b"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sabre-io/uri/zipball/7e0e7dfd0b7e14346a27eabd66e843a6e7f1812b",
+                "reference": "7e0e7dfd0b7e14346a27eabd66e843a6e7f1812b",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.4 || ^8.0"
+            },
+            "require-dev": {
+                "friendsofphp/php-cs-fixer": "^3.17",
+                "phpstan/extension-installer": "^1.3",
+                "phpstan/phpstan": "^1.10",
+                "phpstan/phpstan-phpunit": "^1.3",
+                "phpstan/phpstan-strict-rules": "^1.5",
+                "phpunit/phpunit": "^9.6"
+            },
+            "type": "library",
+            "autoload": {
+                "files": [
+                    "lib/functions.php"
+                ],
+                "psr-4": {
+                    "Sabre\\Uri\\": "lib/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Evert Pot",
+                    "email": "me@evertpot.com",
+                    "homepage": "http://evertpot.com/",
+                    "role": "Developer"
+                }
+            ],
+            "description": "Functions for making sense out of URIs.",
+            "homepage": "http://sabre.io/uri/",
+            "keywords": [
+                "rfc3986",
+                "uri",
+                "url"
+            ],
+            "support": {
+                "forum": "https://groups.google.com/group/sabredav-discuss",
+                "issues": "https://github.com/sabre-io/uri/issues",
+                "source": "https://github.com/fruux/sabre-uri"
+            },
+            "time": "2023-06-09T06:54:04+00:00"
+        },
+        {
+            "name": "sabre/vobject",
+            "version": "4.5.4",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sabre-io/vobject.git",
+                "reference": "a6d53a3e5bec85ed3dd78868b7de0f5b4e12f772"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sabre-io/vobject/zipball/a6d53a3e5bec85ed3dd78868b7de0f5b4e12f772",
+                "reference": "a6d53a3e5bec85ed3dd78868b7de0f5b4e12f772",
+                "shasum": ""
+            },
+            "require": {
+                "ext-mbstring": "*",
+                "php": "^7.1 || ^8.0",
+                "sabre/xml": "^2.1 || ^3.0 || ^4.0"
+            },
+            "require-dev": {
+                "friendsofphp/php-cs-fixer": "~2.17.1",
+                "phpstan/phpstan": "^0.12",
+                "phpunit/php-invoker": "^2.0 || ^3.1",
+                "phpunit/phpunit": "^7.5 || ^8.5 || ^9.0"
+            },
+            "suggest": {
+                "hoa/bench": "If you would like to run the benchmark scripts"
+            },
+            "bin": [
+                "bin/vobject",
+                "bin/generate_vcards"
+            ],
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "4.0.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Sabre\\VObject\\": "lib/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Evert Pot",
+                    "email": "me@evertpot.com",
+                    "homepage": "http://evertpot.com/",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Dominik Tobschall",
+                    "email": "dominik@fruux.com",
+                    "homepage": "http://tobschall.de/",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Ivan Enderlin",
+                    "email": "ivan.enderlin@hoa-project.net",
+                    "homepage": "http://mnt.io/",
+                    "role": "Developer"
+                }
+            ],
+            "description": "The VObject library for PHP allows you to easily parse and manipulate iCalendar and vCard objects",
+            "homepage": "http://sabre.io/vobject/",
+            "keywords": [
+                "availability",
+                "freebusy",
+                "iCalendar",
+                "ical",
+                "ics",
+                "jCal",
+                "jCard",
+                "recurrence",
+                "rfc2425",
+                "rfc2426",
+                "rfc2739",
+                "rfc4770",
+                "rfc5545",
+                "rfc5546",
+                "rfc6321",
+                "rfc6350",
+                "rfc6351",
+                "rfc6474",
+                "rfc6638",
+                "rfc6715",
+                "rfc6868",
+                "vCalendar",
+                "vCard",
+                "vcf",
+                "xCal",
+                "xCard"
+            ],
+            "support": {
+                "forum": "https://groups.google.com/group/sabredav-discuss",
+                "issues": "https://github.com/sabre-io/vobject/issues",
+                "source": "https://github.com/fruux/sabre-vobject"
+            },
+            "time": "2023-11-09T12:54:37+00:00"
+        },
+        {
+            "name": "sabre/xml",
+            "version": "2.2.6",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sabre-io/xml.git",
+                "reference": "9cde7cdab1e50893cc83b037b40cd47bfde42a2b"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sabre-io/xml/zipball/9cde7cdab1e50893cc83b037b40cd47bfde42a2b",
+                "reference": "9cde7cdab1e50893cc83b037b40cd47bfde42a2b",
+                "shasum": ""
+            },
+            "require": {
+                "ext-dom": "*",
+                "ext-xmlreader": "*",
+                "ext-xmlwriter": "*",
+                "lib-libxml": ">=2.6.20",
+                "php": "^7.1 || ^8.0",
+                "sabre/uri": ">=1.0,<3.0.0"
+            },
+            "require-dev": {
+                "friendsofphp/php-cs-fixer": "~2.17.1",
+                "phpstan/phpstan": "^0.12",
+                "phpunit/phpunit": "^7.5 || ^8.5 || ^9.0"
+            },
+            "type": "library",
+            "autoload": {
+                "files": [
+                    "lib/Deserializer/functions.php",
+                    "lib/Serializer/functions.php"
+                ],
+                "psr-4": {
+                    "Sabre\\Xml\\": "lib/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Evert Pot",
+                    "email": "me@evertpot.com",
+                    "homepage": "http://evertpot.com/",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Markus Staab",
+                    "email": "markus.staab@redaxo.de",
+                    "role": "Developer"
+                }
+            ],
+            "description": "sabre/xml is an XML library that you may not hate.",
+            "homepage": "https://sabre.io/xml/",
+            "keywords": [
+                "XMLReader",
+                "XMLWriter",
+                "dom",
+                "xml"
+            ],
+            "support": {
+                "forum": "https://groups.google.com/group/sabredav-discuss",
+                "issues": "https://github.com/sabre-io/xml/issues",
+                "source": "https://github.com/fruux/sabre-xml"
+            },
+            "time": "2023-06-28T12:56:05+00:00"
+        }
+    ],
     "packages-dev": [
         {
             "name": "doctrine/instantiator",
@@ -1048,56 +1544,6 @@
             },
             "time": "2019-01-08T18:20:26+00:00"
         },
-        {
-            "name": "psr/log",
-            "version": "1.1.4",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/php-fig/log.git",
-                "reference": "d49695b909c3b7628b6289db5479a1c204601f11"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/php-fig/log/zipball/d49695b909c3b7628b6289db5479a1c204601f11",
-                "reference": "d49695b909c3b7628b6289db5479a1c204601f11",
-                "shasum": ""
-            },
-            "require": {
-                "php": ">=5.3.0"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "1.1.x-dev"
-                }
-            },
-            "autoload": {
-                "psr-4": {
-                    "Psr\\Log\\": "Psr/Log/"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "PHP-FIG",
-                    "homepage": "https://www.php-fig.org/"
-                }
-            ],
-            "description": "Common interface for logging libraries",
-            "homepage": "https://github.com/php-fig/log",
-            "keywords": [
-                "log",
-                "psr",
-                "psr-3"
-            ],
-            "support": {
-                "source": "https://github.com/php-fig/log/tree/1.1.4"
-            },
-            "time": "2021-05-03T11:20:27+00:00"
-        },
         {
             "name": "sebastian/cli-parser",
             "version": "1.0.1",
diff --git a/lib/Listener/UserDeletedListener.php b/lib/Listener/UserDeletedListener.php
index 2ea79660..66d55fff 100644
--- a/lib/Listener/UserDeletedListener.php
+++ b/lib/Listener/UserDeletedListener.php
@@ -28,6 +28,9 @@
 use OCP\EventDispatcher\IEventListener;
 use OCP\User\Events\UserDeletedEvent;
 
+/**
+ * @template-implements IEventListener<UserDeletedEvent>
+ */
 class UserDeletedListener implements IEventListener {
 	private IKeyStorage $keyStorage;