files: Create files from template API

Signed-off-by: Julius Härtl <jus@bitgrid.net>

16 files changed, 721 insertions, 1 deletions

diff --git a/apps/files/appinfo/routes.php b/apps/files/appinfo/routes.php
index 65c8deb4427..03a025cadf5 100644
--- a/apps/files/appinfo/routes.php
+++ b/apps/files/appinfo/routes.php
@@ -139,6 +139,21 @@ $application->registerRoutes(
 				'verb' => 'POST'
 			],
 			[
+				'name' => 'Template#list',
+				'url' => '/api/v1/templates',
+				'verb' => 'GET'
+			],
+			[
+				'name' => 'Template#create',
+				'url' => '/api/v1/templates/create',
+				'verb' => 'POST'
+			],
+			[
+				'name' => 'Template#path',
+				'url' => '/api/v1/templates/path',
+				'verb' => 'POST'
+			],
+			[
 				'name' => 'TransferOwnership#transfer',
 				'url' => '/api/v1/transferownership',
 				'verb' => 'POST',
diff --git a/apps/files/composer/composer/autoload_classmap.php b/apps/files/composer/composer/autoload_classmap.php
index 53fccf702bf..bc2e496294b 100644
--- a/apps/files/composer/composer/autoload_classmap.php
+++ b/apps/files/composer/composer/autoload_classmap.php
@@ -35,6 +35,7 @@ return array(
     'OCA\\Files\\Controller\\ApiController' => $baseDir . '/../lib/Controller/ApiController.php',
     'OCA\\Files\\Controller\\DirectEditingController' => $baseDir . '/../lib/Controller/DirectEditingController.php',
     'OCA\\Files\\Controller\\DirectEditingViewController' => $baseDir . '/../lib/Controller/DirectEditingViewController.php',
+    'OCA\\Files\\Controller\\TemplateController' => $baseDir . '/../lib/Controller/TemplateController.php',
     'OCA\\Files\\Controller\\TransferOwnershipController' => $baseDir . '/../lib/Controller/TransferOwnershipController.php',
     'OCA\\Files\\Controller\\ViewController' => $baseDir . '/../lib/Controller/ViewController.php',
     'OCA\\Files\\Db\\TransferOwnership' => $baseDir . '/../lib/Db/TransferOwnership.php',
diff --git a/apps/files/composer/composer/autoload_static.php b/apps/files/composer/composer/autoload_static.php
index 635ed27c1bb..ba39b2c5707 100644
--- a/apps/files/composer/composer/autoload_static.php
+++ b/apps/files/composer/composer/autoload_static.php
@@ -50,6 +50,7 @@ class ComposerStaticInitFiles
         'OCA\\Files\\Controller\\ApiController' => __DIR__ . '/..' . '/../lib/Controller/ApiController.php',
         'OCA\\Files\\Controller\\DirectEditingController' => __DIR__ . '/..' . '/../lib/Controller/DirectEditingController.php',
         'OCA\\Files\\Controller\\DirectEditingViewController' => __DIR__ . '/..' . '/../lib/Controller/DirectEditingViewController.php',
+        'OCA\\Files\\Controller\\TemplateController' => __DIR__ . '/..' . '/../lib/Controller/TemplateController.php',
         'OCA\\Files\\Controller\\TransferOwnershipController' => __DIR__ . '/..' . '/../lib/Controller/TransferOwnershipController.php',
         'OCA\\Files\\Controller\\ViewController' => __DIR__ . '/..' . '/../lib/Controller/ViewController.php',
         'OCA\\Files\\Db\\TransferOwnership' => __DIR__ . '/..' . '/../lib/Db/TransferOwnership.php',
diff --git a/apps/files/lib/Controller/TemplateController.php b/apps/files/lib/Controller/TemplateController.php
new file mode 100644
index 00000000000..69d2790df1a
--- /dev/null
+++ b/apps/files/lib/Controller/TemplateController.php
@@ -0,0 +1,76 @@
+<?php
+/*
+ * @copyright Copyright (c) 2021 Julius Härtl <jus@bitgrid.net>
+ *
+ * @author Julius Härtl <jus@bitgrid.net>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+declare(strict_types=1);
+
+namespace OCA\Files\Controller;
+
+use OCP\AppFramework\Http\DataResponse;
+use OCP\AppFramework\OCS\OCSForbiddenException;
+use OCP\AppFramework\OCSController;
+use OCP\Files\GenericFileException;
+use OCP\Files\Template\ITemplateManager;
+use OCP\IRequest;
+
+class TemplateController extends OCSController {
+	protected $templateManager;
+
+	public function __construct($appName, IRequest $request, ITemplateManager $templateManager) {
+		parent::__construct($appName, $request);
+		$this->templateManager = $templateManager;
+	}
+
+	/**
+	 * @NoAdminRequired
+	 */
+	public function list(): DataResponse {
+		return new DataResponse($this->templateManager->listCreators());
+	}
+
+	/**
+	 * @NoAdminRequired
+	 * @throws OCSForbiddenException
+	 */
+	public function create(string $filePath, string $templatePath = '', string $templateType = 'user'): DataResponse {
+		try {
+			return new DataResponse($this->templateManager->createFromTemplate($filePath, $templatePath, $templateType));
+		} catch (GenericFileException $e) {
+			throw new OCSForbiddenException($e->getMessage());
+		}
+	}
+
+	/**
+	 * @NoAdminRequired
+	 */
+	public function path(string $templatePath = '', bool $copySystemTemplates = false) {
+		try {
+			$this->templateManager->setTemplatePath($templatePath);
+			if ($copySystemTemplates) {
+				$this->templateManager->initializeTemplateDirectory($templatePath);
+			}
+			return new DataResponse();
+		} catch (GenericFileException $e) {
+			throw new OCSForbiddenException($e->getMessage());
+		}
+	}
+}
diff --git a/apps/files/lib/Controller/ViewController.php b/apps/files/lib/Controller/ViewController.php
index 364735437e4..124363f07bb 100644
--- a/apps/files/lib/Controller/ViewController.php
+++ b/apps/files/lib/Controller/ViewController.php
@@ -44,10 +44,12 @@ use OCP\AppFramework\Http\ContentSecurityPolicy;
 use OCP\AppFramework\Http\RedirectResponse;
 use OCP\AppFramework\Http\Response;
 use OCP\AppFramework\Http\TemplateResponse;
+use OCP\AppFramework\Services\IInitialState;
 use OCP\EventDispatcher\IEventDispatcher;
 use OCP\Files\Folder;
 use OCP\Files\IRootFolder;
 use OCP\Files\NotFoundException;
+use OCP\Files\Template\ITemplateManager;
 use OCP\IConfig;
 use OCP\IL10N;
 use OCP\IRequest;
@@ -80,6 +82,10 @@ class ViewController extends Controller {
 	protected $rootFolder;
 	/** @var Helper */
 	protected $activityHelper;
+	/** @var IInitialState */
+	private $initialState;
+	/** @var ITemplateManager */
+	private $templateManager;
 
 	public function __construct(string $appName,
 		IRequest $request,
@@ -90,7 +96,9 @@ class ViewController extends Controller {
 		IUserSession $userSession,
 		IAppManager $appManager,
 		IRootFolder $rootFolder,
-		Helper $activityHelper
+		Helper $activityHelper,
+		IInitialState $initialState,
+		ITemplateManager $templateManager
 	) {
 		parent::__construct($appName, $request);
 		$this->appName = $appName;
@@ -103,6 +111,8 @@ class ViewController extends Controller {
 		$this->appManager = $appManager;
 		$this->rootFolder = $rootFolder;
 		$this->activityHelper = $activityHelper;
+		$this->initialState = $initialState;
+		$this->templateManager = $templateManager;
 	}
 
 	/**
@@ -283,6 +293,8 @@ class ViewController extends Controller {
 		if (class_exists(LoadViewer::class)) {
 			$this->eventDispatcher->dispatchTyped(new LoadViewer());
 		}
+		$this->initialState->provideInitialState('template_path', $this->templateManager->hasTemplateDirectory() ? $this->templateManager->getTemplatePath() : null);
+		$this->initialState->provideInitialState('templates', $this->templateManager->listCreators());
 
 		$params = [];
 		$params['usedSpacePercent'] = (int) $storageInfo['relative'];
diff --git a/apps/files/tests/Controller/ViewControllerTest.php b/apps/files/tests/Controller/ViewControllerTest.php
index fc2b82de9c8..bc233599e34 100644
--- a/apps/files/tests/Controller/ViewControllerTest.php
+++ b/apps/files/tests/Controller/ViewControllerTest.php
@@ -36,10 +36,12 @@ use OCA\Files\Activity\Helper;
 use OCA\Files\Controller\ViewController;
 use OCP\App\IAppManager;
 use OCP\AppFramework\Http;
+use OCP\AppFramework\Services\IInitialState;
 use OCP\EventDispatcher\IEventDispatcher;
 use OCP\Files\File;
 use OCP\Files\Folder;
 use OCP\Files\IRootFolder;
+use OCP\Files\Template\ITemplateManager;
 use OCP\IConfig;
 use OCP\IL10N;
 use OCP\IRequest;
@@ -78,6 +80,10 @@ class ViewControllerTest extends TestCase {
 	private $rootFolder;
 	/** @var Helper|\PHPUnit\Framework\MockObject\MockObject */
 	private $activityHelper;
+	/** @var IInitialState|\PHPUnit\Framework\MockObject\MockObject */
+	private $initialState;
+	/** @var ITemplateManager|\PHPUnit\Framework\MockObject\MockObject */
+	private $templateManager;
 
 	protected function setUp(): void {
 		parent::setUp();
@@ -97,6 +103,8 @@ class ViewControllerTest extends TestCase {
 			->willReturn($this->user);
 		$this->rootFolder = $this->getMockBuilder('\OCP\Files\IRootFolder')->getMock();
 		$this->activityHelper = $this->createMock(Helper::class);
+		$this->initialState = $this->createMock(IInitialState::class);
+		$this->templateManager = $this->createMock(ITemplateManager::class);
 		$this->viewController = $this->getMockBuilder('\OCA\Files\Controller\ViewController')
 			->setConstructorArgs([
 				'files',
@@ -109,6 +117,8 @@ class ViewControllerTest extends TestCase {
 				$this->appManager,
 				$this->rootFolder,
 				$this->activityHelper,
+				$this->initialState,
+				$this->templateManager,
 			])
 		->setMethods([
 			'getStorageInfo',
diff --git a/lib/composer/composer/autoload_classmap.php b/lib/composer/composer/autoload_classmap.php
index 673d5581042..63cd4db5959 100644
--- a/lib/composer/composer/autoload_classmap.php
+++ b/lib/composer/composer/autoload_classmap.php
@@ -315,6 +315,11 @@ return array(
     'OCP\\Files\\Storage\\IStorage' => $baseDir . '/lib/public/Files/Storage/IStorage.php',
     'OCP\\Files\\Storage\\IStorageFactory' => $baseDir . '/lib/public/Files/Storage/IStorageFactory.php',
     'OCP\\Files\\Storage\\IWriteStreamStorage' => $baseDir . '/lib/public/Files/Storage/IWriteStreamStorage.php',
+    'OCP\\Files\\Template\\CreatedFromTemplateEvent' => $baseDir . '/lib/public/Files/Template/CreatedFromTemplateEvent.php',
+    'OCP\\Files\\Template\\ICustomTemplateProvider' => $baseDir . '/lib/public/Files/Template/ICustomTemplateProvider.php',
+    'OCP\\Files\\Template\\ITemplateManager' => $baseDir . '/lib/public/Files/Template/ITemplateManager.php',
+    'OCP\\Files\\Template\\Template' => $baseDir . '/lib/public/Files/Template/Template.php',
+    'OCP\\Files\\Template\\TemplateFileCreator' => $baseDir . '/lib/public/Files/Template/TemplateFileCreator.php',
     'OCP\\Files\\UnseekableException' => $baseDir . '/lib/public/Files/UnseekableException.php',
     'OCP\\Files_FullTextSearch\\Model\\AFilesDocument' => $baseDir . '/lib/public/Files_FullTextSearch/Model/AFilesDocument.php',
     'OCP\\FullTextSearch\\Exceptions\\FullTextSearchAppNotAvailableException' => $baseDir . '/lib/public/FullTextSearch/Exceptions/FullTextSearchAppNotAvailableException.php',
@@ -1125,6 +1130,7 @@ return array(
     'OC\\Files\\Stream\\HashWrapper' => $baseDir . '/lib/private/Files/Stream/HashWrapper.php',
     'OC\\Files\\Stream\\Quota' => $baseDir . '/lib/private/Files/Stream/Quota.php',
     'OC\\Files\\Stream\\SeekableHttpStream' => $baseDir . '/lib/private/Files/Stream/SeekableHttpStream.php',
+    'OC\\Files\\Template\\TemplateManager' => $baseDir . '/lib/private/Files/Template/TemplateManager.php',
     'OC\\Files\\Type\\Detection' => $baseDir . '/lib/private/Files/Type/Detection.php',
     'OC\\Files\\Type\\Loader' => $baseDir . '/lib/private/Files/Type/Loader.php',
     'OC\\Files\\Type\\TemplateManager' => $baseDir . '/lib/private/Files/Type/TemplateManager.php',
diff --git a/lib/composer/composer/autoload_static.php b/lib/composer/composer/autoload_static.php
index 1ee50ae6b71..6bcd72d01f0 100644
--- a/lib/composer/composer/autoload_static.php
+++ b/lib/composer/composer/autoload_static.php
@@ -344,6 +344,11 @@ class ComposerStaticInit53792487c5a8370acc0b06b1a864ff4c
         'OCP\\Files\\Storage\\IStorage' => __DIR__ . '/../../..' . '/lib/public/Files/Storage/IStorage.php',
         'OCP\\Files\\Storage\\IStorageFactory' => __DIR__ . '/../../..' . '/lib/public/Files/Storage/IStorageFactory.php',
         'OCP\\Files\\Storage\\IWriteStreamStorage' => __DIR__ . '/../../..' . '/lib/public/Files/Storage/IWriteStreamStorage.php',
+        'OCP\\Files\\Template\\CreatedFromTemplateEvent' => __DIR__ . '/../../..' . '/lib/public/Files/Template/CreatedFromTemplateEvent.php',
+        'OCP\\Files\\Template\\ICustomTemplateProvider' => __DIR__ . '/../../..' . '/lib/public/Files/Template/ICustomTemplateProvider.php',
+        'OCP\\Files\\Template\\ITemplateManager' => __DIR__ . '/../../..' . '/lib/public/Files/Template/ITemplateManager.php',
+        'OCP\\Files\\Template\\Template' => __DIR__ . '/../../..' . '/lib/public/Files/Template/Template.php',
+        'OCP\\Files\\Template\\TemplateFileCreator' => __DIR__ . '/../../..' . '/lib/public/Files/Template/TemplateFileCreator.php',
         'OCP\\Files\\UnseekableException' => __DIR__ . '/../../..' . '/lib/public/Files/UnseekableException.php',
         'OCP\\Files_FullTextSearch\\Model\\AFilesDocument' => __DIR__ . '/../../..' . '/lib/public/Files_FullTextSearch/Model/AFilesDocument.php',
         'OCP\\FullTextSearch\\Exceptions\\FullTextSearchAppNotAvailableException' => __DIR__ . '/../../..' . '/lib/public/FullTextSearch/Exceptions/FullTextSearchAppNotAvailableException.php',
@@ -1154,6 +1159,7 @@ class ComposerStaticInit53792487c5a8370acc0b06b1a864ff4c
         'OC\\Files\\Stream\\HashWrapper' => __DIR__ . '/../../..' . '/lib/private/Files/Stream/HashWrapper.php',
         'OC\\Files\\Stream\\Quota' => __DIR__ . '/../../..' . '/lib/private/Files/Stream/Quota.php',
         'OC\\Files\\Stream\\SeekableHttpStream' => __DIR__ . '/../../..' . '/lib/private/Files/Stream/SeekableHttpStream.php',
+        'OC\\Files\\Template\\TemplateManager' => __DIR__ . '/../../..' . '/lib/private/Files/Template/TemplateManager.php',
         'OC\\Files\\Type\\Detection' => __DIR__ . '/../../..' . '/lib/private/Files/Type/Detection.php',
         'OC\\Files\\Type\\Loader' => __DIR__ . '/../../..' . '/lib/private/Files/Type/Loader.php',
         'OC\\Files\\Type\\TemplateManager' => __DIR__ . '/../../..' . '/lib/private/Files/Type/TemplateManager.php',
diff --git a/lib/private/Files/Template/TemplateManager.php b/lib/private/Files/Template/TemplateManager.php
new file mode 100644
index 00000000000..8b0c78d0b9a
--- /dev/null
+++ b/lib/private/Files/Template/TemplateManager.php
@@ -0,0 +1,237 @@
+<?php
+/*
+ * @copyright Copyright (c) 2021 Julius Härtl <jus@bitgrid.net>
+ *
+ * @author Julius Härtl <jus@bitgrid.net>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+declare(strict_types=1);
+
+
+namespace OC\Files\Template;
+
+use OCP\EventDispatcher\IEventDispatcher;
+use OCP\Files\Folder;
+use OCP\Files\File;
+use OCP\Files\GenericFileException;
+use OCP\Files\IRootFolder;
+use OCP\Files\Node;
+use OCP\Files\NotFoundException;
+use OCP\Files\Template\CreatedFromTemplateEvent;
+use OCP\Files\Template\ICustomTemplateProvider;
+use OCP\Files\Template\ITemplateManager;
+use OCP\Files\Template\Template;
+use OCP\Files\Template\TemplateFileCreator;
+use OCP\IConfig;
+use OCP\IPreview;
+use OCP\IServerContainer;
+use OCP\IUserSession;
+use OCP\L10N\IFactory;
+use Psr\Log\LoggerInterface;
+
+class TemplateManager implements ITemplateManager {
+	private $types = [];
+
+	private $registeredProviders = [];
+	private $providers;
+
+	private $serverContainer;
+	private $eventDispatcher;
+	private $rootFolder;
+	private $previewManager;
+	private $config;
+	private $l10n;
+	private $logger;
+	private $userId;
+
+	public function __construct(
+		IServerContainer $serverContainer,
+		IEventDispatcher $eventDispatcher,
+		IRootFolder $rootFolder,
+		IUserSession $userSession,
+		IPreview $previewManager,
+		IConfig $config,
+		IFactory $l10n,
+		LoggerInterface $logger
+	) {
+		$this->serverContainer = $serverContainer;
+		$this->eventDispatcher = $eventDispatcher;
+		$this->rootFolder = $rootFolder;
+		$this->previewManager = $previewManager;
+		$this->config = $config;
+		$this->l10n = $l10n->get('lib');
+		$this->logger = $logger;
+		$user = $userSession->getUser();
+		$this->userId = $user ? $user->getUID() : null;
+	}
+
+	public function registerTemplateFileCreator(TemplateFileCreator $templateType): void {
+		$this->types[] = $templateType;
+	}
+
+	public function registerTemplateProvider(string $providerClass): void {
+		$this->registeredProviders[] = $providerClass;
+	}
+
+	public function getRegisteredProviders(): array {
+		if ($this->providers !== null) {
+			return $this->providers;
+		}
+		$this->providers = [];
+		foreach ($this->registeredProviders as $providerClass) {
+			$this->providers[$providerClass] = $this->serverContainer->get($providerClass);
+		}
+		return $this->providers;
+	}
+
+	public function listCreators(): array {
+		return array_map(function (TemplateFileCreator $entry) {
+			return array_merge($entry->jsonSerialize(), [
+				'templates' => $this->getTemplateFiles($entry)
+			]);
+		}, $this->types);
+	}
+
+	/**
+	 * @param string $filePath
+	 * @param string $templateId
+	 * @return array
+	 * @throws GenericFileException
+	 */
+	public function createFromTemplate(string $filePath, string $templateId = '', string $templateType = 'user'): array {
+		$userFolder = $this->rootFolder->getUserFolder($this->userId);
+		try {
+			$userFolder->get($filePath);
+			throw new GenericFileException($this->l10n->t('File already exists'));
+		} catch (NotFoundException $e) {
+		}
+		try {
+			$targetFile = $userFolder->newFile($filePath);
+			if ($templateType === 'user' && $templateId !== '') {
+				$template = $userFolder->get($templateId);
+				$template->copy($targetFile->getPath());
+			} else {
+				$matchingProvider = array_filter($this->getRegisteredProviders(), function (ICustomTemplateProvider $provider) use ($templateType) {
+					return $templateType === get_class($provider);
+				});
+				$provider = array_shift($matchingProvider);
+				if ($provider) {
+					$template = $provider->getCustomTemplate($templateId);
+					$template->copy($targetFile->getPath());
+				}
+			}
+			$this->eventDispatcher->dispatchTyped(new CreatedFromTemplateEvent($template, $targetFile));
+			return $this->formatFile($userFolder->get($filePath));
+		} catch (\Exception $e) {
+			$this->logger->error($e->getMessage(), ['exception' => $e]);
+			throw new GenericFileException($this->l10n->t('Failed to create file from template'));
+		}
+	}
+
+	/**
+	 * @return Folder
+	 * @throws \OCP\Files\NotFoundException
+	 * @throws \OCP\Files\NotPermittedException
+	 * @throws \OC\User\NoUserException
+	 */
+	private function getTemplateFolder(): Node {
+		return $this->rootFolder->getUserFolder($this->userId)->get($this->getTemplatePath());
+	}
+
+	private function getTemplateFiles(TemplateFileCreator $type): array {
+		$templates = [];
+		foreach ($this->getRegisteredProviders() as $provider) {
+			foreach ($type->getMimetypes() as $mimetype) {
+				foreach ($provider->getCustomTemplates($mimetype) as $template) {
+					$templates[] = $template;
+				}
+			}
+		}
+		try {
+			$userTemplateFolder = $this->getTemplateFolder();
+		} catch (\Exception $e) {
+			return $templates;
+		}
+		foreach ($type->getMimetypes() as $mimetype) {
+			foreach ($userTemplateFolder->searchByMime($mimetype) as $templateFile) {
+				$template = new Template(
+					'user',
+					$this->rootFolder->getUserFolder($this->userId)->getRelativePath($templateFile->getPath()),
+					$templateFile
+				);
+				$template->setHasPreview($this->previewManager->isAvailable($templateFile));
+				$templates[] = $template;
+			}
+		}
+
+		return $templates;
+	}
+
+	/**
+	 * @param Node|File $file
+	 * @return array
+	 * @throws NotFoundException
+	 * @throws \OCP\Files\InvalidPathException
+	 */
+	private function formatFile(Node $file): array {
+		return [
+			'basename' => $file->getName(),
+			'etag' => $file->getEtag(),
+			'fileid' => $file->getId(),
+			'filename' => $this->rootFolder->getUserFolder($this->userId)->getRelativePath($file->getPath()),
+			'lastmod' => $file->getMTime(),
+			'mime' => $file->getMimetype(),
+			'size' => $file->getSize(),
+			'type' => $file->getType(),
+			'hasPreview' => $this->previewManager->isAvailable($file)
+		];
+	}
+
+	public function hasTemplateDirectory(): bool {
+		try {
+			$this->getTemplateFolder();
+			return true;
+		} catch (\Exception $e) {
+		}
+		return false;
+	}
+
+	public function setTemplatePath(string $path): void {
+		$this->config->setUserValue($this->userId, 'core', 'templateDirectory', $path);
+	}
+
+	public function getTemplatePath(): string {
+		return $this->config->getUserValue($this->userId, 'core', 'templateDirectory', $this->l10n->t('Templates') . '/');
+	}
+
+	public function initializeTemplateDirectory(string $path = null, string $userId = null): void {
+		if ($userId !== null) {
+			$this->userId = $userId;
+		}
+		$userFolder = $this->rootFolder->getUserFolder($this->userId);
+		$templateDirectoryPath = $path ?? $this->l10n->t('Templates') . '/';
+		try {
+			$userFolder->get($templateDirectoryPath);
+		} catch (NotFoundException $e) {
+			$folder = $userFolder->newFolder($templateDirectoryPath);
+			$folder->newFile('Testtemplate.txt');
+		}
+		$this->setTemplatePath($templateDirectoryPath);
+	}
+}
diff --git a/lib/private/Server.php b/lib/private/Server.php
index ba954165799..c0d6afbaaf6 100644
--- a/lib/private/Server.php
+++ b/lib/private/Server.php
@@ -95,6 +95,7 @@ use OC\Files\Node\HookConnector;
 use OC\Files\Node\LazyRoot;
 use OC\Files\Node\Root;
 use OC\Files\Storage\StorageFactory;
+use OC\Files\Template\TemplateManager;
 use OC\Files\Type\Loader;
 use OC\Files\View;
 use OC\FullTextSearch\FullTextSearchManager;
@@ -166,6 +167,7 @@ use OCP\Files\IRootFolder;
 use OCP\Files\Mount\IMountManager;
 use OCP\Files\NotFoundException;
 use OCP\Files\Storage\IStorageFactory;
+use OCP\Files\Template\ITemplateManager;
 use OCP\FullTextSearch\IFullTextSearchManager;
 use OCP\GlobalScale\IConfig;
 use OCP\Group\Events\BeforeGroupCreatedEvent;
@@ -289,6 +291,7 @@ class Server extends ServerContainer implements IServerContainer {
 		$this->registerDeprecatedAlias('ContactsManager', \OCP\Contacts\IManager::class);
 
 		$this->registerAlias(\OCP\DirectEditing\IManager::class, \OC\DirectEditing\Manager::class);
+		$this->registerAlias(ITemplateManager::class, TemplateManager::class);
 
 		$this->registerAlias(IActionFactory::class, ActionFactory::class);
 
diff --git a/lib/private/legacy/OC_Util.php b/lib/private/legacy/OC_Util.php
index d5805719ea2..16e68b07cf1 100644
--- a/lib/private/legacy/OC_Util.php
+++ b/lib/private/legacy/OC_Util.php
@@ -66,6 +66,7 @@
 use bantu\IniGetWrapper\IniGetWrapper;
 use OC\AppFramework\Http\Request;
 use OC\Files\Storage\LocalRootStorage;
+use OCP\Files\Template\ITemplateManager;
 use OCP\IConfig;
 use OCP\IGroupManager;
 use OCP\ILogger;
@@ -447,6 +448,8 @@ class OC_Util {
 			self::copyr($skeletonDirectory, $userDirectory);
 			// update the file cache
 			$userDirectory->getStorage()->getScanner()->scan('', \OC\Files\Cache\Scanner::SCAN_RECURSIVE);
+			$templateManaer = \OC::$server->get(ITemplateManager::class);
+			$templateManaer->initializeTemplateDirectory(null, $userId);
 		}
 	}
 
diff --git a/lib/public/Files/Template/CreatedFromTemplateEvent.php b/lib/public/Files/Template/CreatedFromTemplateEvent.php
new file mode 100644
index 00000000000..8d802814406
--- /dev/null
+++ b/lib/public/Files/Template/CreatedFromTemplateEvent.php
@@ -0,0 +1,64 @@
+<?php
+/*
+ * @copyright Copyright (c) 2021 Julius Härtl <jus@bitgrid.net>
+ *
+ * @author Julius Härtl <jus@bitgrid.net>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+declare(strict_types=1);
+
+
+namespace OCP\Files\Template;
+
+use OCP\EventDispatcher\Event;
+use OCP\Files\File;
+
+/**
+ * @since 21.0.0
+ */
+class CreatedFromTemplateEvent extends Event {
+	private $template;
+	private $target;
+
+	/**
+	 * @param File|null $template
+	 * @param File $target
+	 * @since 21.0.0
+	 */
+	public function __construct(?File $template, File $target) {
+		$this->template = $template;
+		$this->target = $target;
+	}
+
+	/**
+	 * @return File|null
+	 * @since 21.0.0
+	 */
+	public function getTemplate(): ?File {
+		return $this->template;
+	}
+
+	/**
+	 * @return File
+	 * @since 21.0.0
+	 */
+	public function getTarget(): File {
+		return $this->target;
+	}
+}
diff --git a/lib/public/Files/Template/ICustomTemplateProvider.php b/lib/public/Files/Template/ICustomTemplateProvider.php
new file mode 100644
index 00000000000..a14ea86a100
--- /dev/null
+++ b/lib/public/Files/Template/ICustomTemplateProvider.php
@@ -0,0 +1,51 @@
+<?php
+/*
+ * @copyright Copyright (c) 2021 Julius Härtl <jus@bitgrid.net>
+ *
+ * @author Julius Härtl <jus@bitgrid.net>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+declare(strict_types=1);
+
+
+namespace OCP\Files\Template;
+
+use OCP\Files\File;
+
+/**
+ * @since 21.0.0
+ */
+interface ICustomTemplateProvider {
+	/**
+	 * Return a list of additional templates that the template provider is offering
+	 *
+	 * @return File[]
+	 * @since 21.0.0
+	 */
+	public function getCustomTemplates(string $mimetype): array;
+
+	/**
+	 * Return the file for a given template id
+	 *
+	 * @param string $template identifier of the template
+	 * @return File
+	 * @since 21.0.0
+	 */
+	public function getCustomTemplate(string $template): File;
+}
diff --git a/lib/public/Files/Template/ITemplateManager.php b/lib/public/Files/Template/ITemplateManager.php
new file mode 100644
index 00000000000..61dbb68cd77
--- /dev/null
+++ b/lib/public/Files/Template/ITemplateManager.php
@@ -0,0 +1,94 @@
+<?php
+/*
+ * @copyright Copyright (c) 2021 Julius Härtl <jus@bitgrid.net>
+ *
+ * @author Julius Härtl <jus@bitgrid.net>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+declare(strict_types=1);
+
+
+namespace OCP\Files\Template;
+
+use OCP\Files\GenericFileException;
+
+/**
+ * @since 21.0.0
+ */
+interface ITemplateManager {
+
+	/**
+	 * Register a template type support
+	 *
+	 * @param TemplateFileCreator $templateType
+	 * @since 21.0.0
+	 */
+	public function registerTemplateFileCreator(TemplateFileCreator $templateType): void;
+
+	/**
+	 * Register a custom template provider class that is able to inject custom templates
+	 * in addition to the user defined ones
+	 *
+	 * @param string $providerClass
+	 * @since 21.0.0
+	 */
+	public function registerTemplateProvider(string $providerClass): void;
+
+	/**
+	 * Get a list of available file creators and their offered templates
+	 *
+	 * @return array
+	 * @since 21.0.0
+	 */
+	public function listCreators(): array;
+
+	/**
+	 * @return bool
+	 * @since 21.0.0
+	 */
+	public function hasTemplateDirectory(): bool;
+
+	/**
+	 * @param string $path
+	 * @return void
+	 * @since 21.0.0
+	 */
+	public function setTemplatePath(string $path): void;
+
+	/**
+	 * @return string
+	 * @since 21.0.0
+	 */
+	public function getTemplatePath(): string;
+
+	/**
+	 * @param string $path
+	 * @since 21.0.0
+	 */
+	public function initializeTemplateDirectory(string $path): void;
+
+	/**
+	 * @param string $filePath
+	 * @param string $templateId
+	 * @return array
+	 * @throws GenericFileException
+	 * @since 21.0.0
+	 */
+	public function createFromTemplate(string $filePath, string $templateId = '', string $templateType = 'user'): array;
+}
diff --git a/lib/public/Files/Template/Template.php b/lib/public/Files/Template/Template.php
new file mode 100644
index 00000000000..b5b90e01f89
--- /dev/null
+++ b/lib/public/Files/Template/Template.php
@@ -0,0 +1,68 @@
+<?php
+/*
+ * @copyright Copyright (c) 2021 Julius Härtl <jus@bitgrid.net>
+ *
+ * @author Julius Härtl <jus@bitgrid.net>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+declare(strict_types=1);
+
+
+namespace OCP\Files\Template;
+
+use OCP\Files\File;
+
+class Template implements \JsonSerializable {
+	protected $templateType;
+	protected $templateId;
+	protected $file;
+	protected $hasPreview = false;
+	protected $previewUrl;
+
+	final public function __construct(string $templateType, string $templateId, File $file) {
+		$this->templateType = $templateType;
+		$this->templateId = $templateId;
+		$this->file = $file;
+	}
+
+	final public function setCustomPreviewUrl(string $previewUrl): void {
+		$this->previewUrl = $previewUrl;
+	}
+
+	final public function setHasPreview(bool $hasPreview): void {
+		$this->hasPreview = $hasPreview;
+	}
+
+	final public function jsonSerialize() {
+		return [
+			'templateType' => $this->templateType,
+			'templateId' => $this->templateId,
+			'basename' => $this->file->getName(),
+			'etag' => $this->file->getEtag(),
+			'fileid' => $this->file->getId(),
+			'filename' => $this->templateId,
+			'lastmod' => $this->file->getMTime(),
+			'mime' => $this->file->getMimetype(),
+			'size' => $this->file->getSize(),
+			'type' => $this->file->getType(),
+			'hasPreview' => $this->hasPreview,
+			'previewUrl' => $this->previewUrl
+		];
+	}
+}
diff --git a/lib/public/Files/Template/TemplateFileCreator.php b/lib/public/Files/Template/TemplateFileCreator.php
new file mode 100644
index 00000000000..eeca2f0c01f
--- /dev/null
+++ b/lib/public/Files/Template/TemplateFileCreator.php
@@ -0,0 +1,73 @@
+<?php
+/*
+ * @copyright Copyright (c) 2021 Julius Härtl <jus@bitgrid.net>
+ *
+ * @author Julius Härtl <jus@bitgrid.net>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+declare(strict_types=1);
+
+namespace OCP\Files\Template;
+
+/**
+ * @since 21.0.0
+ */
+final class TemplateFileCreator implements \JsonSerializable {
+	protected $appId;
+	protected $mimetypes = [];
+	protected $actionName;
+	protected $fileExtension;
+	protected $iconClass;
+
+	public function __construct(
+		string $appId, string $actionName, string $fileExtension
+	) {
+		$this->appId = $appId;
+		$this->actionName = $actionName;
+		$this->fileExtension = $fileExtension;
+	}
+
+	public function getAppId(): string {
+		return $this->appId;
+	}
+
+	public function setIconClass(string $iconClass): TemplateFileCreator {
+		$this->iconClass = $iconClass;
+		return $this;
+	}
+
+	public function addMimetype(string $mimetype): TemplateFileCreator {
+		$this->mimetypes[] = $mimetype;
+		return $this;
+	}
+
+	public function getMimetypes(): array {
+		return $this->mimetypes;
+	}
+
+	public function jsonSerialize() {
+		return [
+			'app' => $this->appId,
+			'label' => $this->actionName,
+			'extension' => $this->fileExtension,
+			'iconClass' => $this->iconClass,
+			'mimetypes' => $this->mimetypes
+		];
+	}
+}