Merge pull request #24585 from owncloud/files_external_lazy

Load external storage backends/auth mechanisms lazily

apps/files_external/appinfo/application.php

@@ -30,20 +30,26 @@ use \OCP\AppFramework\App;
 use OCP\AppFramework\IAppContainer;
 use \OCP\IContainer;
 use \OCA\Files_External\Service\BackendService;
+use \OCA\Files_External\Lib\Config\IBackendProvider;
+use \OCA\Files_External\Lib\Config\IAuthMechanismProvider;
 
 /**
  * @package OCA\Files_External\Appinfo
  */
-class Application extends App {
+class Application extends App implements IBackendProvider, IAuthMechanismProvider {
+
 	public function __construct(array $urlParams = array()) {
 		parent::__construct('files_external', $urlParams);
 
-		$this->getContainer()->registerService('OCP\Files\Config\IUserMountCache', function (IAppContainer $c) {
+		$container = $this->getContainer();
+
+		$container->registerService('OCP\Files\Config\IUserMountCache', function (IAppContainer $c) {
 			return $c->getServer()->query('UserMountCache');
 		});
 
-		$this->loadBackends();
-		$this->loadAuthMechanisms();
+		$backendService = $container->query('OCA\\Files_External\\Service\\BackendService');
+		$backendService->registerBackendProvider($this);
+		$backendService->registerAuthMechanismProvider($this);
 
 		// app developers: do NOT depend on this! it will disappear with oC 9.0!
 		\OC::$server->getEventDispatcher()->dispatch(
@@ -63,13 +69,12 @@ class Application extends App {
 	}
 
 	/**
-	 * Load storage backends provided by this app
+	 * @{inheritdoc}
 	 */
-	protected function loadBackends() {
+	public function getBackends() {
 		$container = $this->getContainer();
-		$service = $container->query('OCA\\Files_External\\Service\\BackendService');
 
-		$service->registerBackends([
+		$backends = [
 			$container->query('OCA\Files_External\Lib\Backend\Local'),
 			$container->query('OCA\Files_External\Lib\Backend\FTP'),
 			$container->query('OCA\Files_External\Lib\Backend\DAV'),
@@ -80,24 +85,25 @@ class Application extends App {
 			$container->query('OCA\Files_External\Lib\Backend\Google'),
 			$container->query('OCA\Files_External\Lib\Backend\Swift'),
 			$container->query('OCA\Files_External\Lib\Backend\SFTP_Key'),
-		]);
+		];
 
 		if (!\OC_Util::runningOnWindows()) {
-			$service->registerBackends([
+			$backends += [
 				$container->query('OCA\Files_External\Lib\Backend\SMB'),
 				$container->query('OCA\Files_External\Lib\Backend\SMB_OC'),
-			]);
+			];
 		}
+
+		return $backends;
 	}
 
 	/**
-	 * Load authentication mechanisms provided by this app
+	 * @{inheritdoc}
 	 */
-	protected function loadAuthMechanisms() {
+	public function getAuthMechanisms() {
 		$container = $this->getContainer();
-		$service = $container->query('OCA\\Files_External\\Service\\BackendService');
 
-		$service->registerAuthMechanisms([
+		return [
 			// AuthMechanism::SCHEME_NULL mechanism
 			$container->query('OCA\Files_External\Lib\Auth\NullMechanism'),
 
@@ -123,7 +129,7 @@ class Application extends App {
 
 			// Specialized mechanisms
 			$container->query('OCA\Files_External\Lib\Auth\AmazonS3\AccessKey'),
-		]);
+		];
 	}
 
 }

apps/files_external/lib/config/iauthmechanismprovider.php

@@ -0,0 +1,38 @@
+<?php
+/**
+ * @author Robin McCorkell <robin@mccorkell.me.uk>
+ *
+ * @copyright Copyright (c) 2016, ownCloud, Inc.
+ * @license AGPL-3.0
+ *
+ * This code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * 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, version 3,
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+
+namespace OCA\Files_External\Lib\Config;
+
+use \OCA\Files_External\Lib\Auth\AuthMechanism;
+
+/**
+ * Provider of external storage auth mechanisms
+ * @since 9.1.0
+ */
+interface IAuthMechanismProvider {
+
+	/**
+	 * @since 9.1.0
+	 * @return AuthMechanism[]
+	 */
+	public function getAuthMechanisms();
+
+}

apps/files_external/lib/config/ibackendprovider.php

@@ -0,0 +1,38 @@
+<?php
+/**
+ * @author Robin McCorkell <robin@mccorkell.me.uk>
+ *
+ * @copyright Copyright (c) 2016, ownCloud, Inc.
+ * @license AGPL-3.0
+ *
+ * This code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * 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, version 3,
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+
+namespace OCA\Files_External\Lib\Config;
+
+use \OCA\Files_External\Lib\Backend\Backend;
+
+/**
+ * Provider of external storage backends
+ * @since 9.1.0
+ */
+interface IBackendProvider {
+
+	/**
+	 * @since 9.1.0
+	 * @return Backend[]
+	 */
+	public function getBackends();
+
+}

apps/files_external/service/backendservice.php

@@ -26,6 +26,8 @@ use \OCP\IConfig;
 
 use \OCA\Files_External\Lib\Backend\Backend;
 use \OCA\Files_External\Lib\Auth\AuthMechanism;
+use \OCA\Files_External\Lib\Config\IBackendProvider;
+use \OCA\Files_External\Lib\Config\IAuthMechanismProvider;
 
 /**
  * Service class to manage backend definitions
@@ -55,9 +57,15 @@ class BackendService {
 	/** @var Backend[] */
 	private $backends = [];
 
+	/** @var IBackendProvider[] */
+	private $backendProviders = [];
+
 	/** @var AuthMechanism[] */
 	private $authMechanisms = [];
 
+	/** @var IAuthMechanismProvider[] */
+	private $authMechanismProviders = [];
+
 	/**
 	 * @param IConfig $config
 	 */
@@ -80,9 +88,44 @@ class BackendService {
 		}
 	}
 
+	/**
+	 * Register a backend provider
+	 *
+	 * @since 9.1.0
+	 * @param IBackendProvider $provider
+	 */
+	public function registerBackendProvider(IBackendProvider $provider) {
+		$this->backendProviders[] = $provider;
+	}
+
+	private function loadBackendProviders() {
+		foreach ($this->backendProviders as $provider) {
+			$this->registerBackends($provider->getBackends());
+		}
+		$this->backendProviders = [];
+	}
+
+	/**
+	 * Register an auth mechanism provider
+	 *
+	 * @since 9.1.0
+	 * @param IAuthMechanismProvider $provider
+	 */
+	public function registerAuthMechanismProvider(IAuthMechanismProvider $provider) {
+		$this->authMechanismProviders[] = $provider;
+	}
+
+	private function loadAuthMechanismProviders() {
+		foreach ($this->authMechanismProviders as $provider) {
+			$this->registerAuthMechanisms($provider->getAuthMechanisms());
+		}
+		$this->authMechanismProviders = [];
+	}
+
 	/**
 	 * Register a backend
 	 *
+	 * @deprecated 9.1.0 use registerBackendProvider()
 	 * @param Backend $backend
 	 */
 	public function registerBackend(Backend $backend) {
@@ -95,6 +138,7 @@ class BackendService {
 	}
 
 	/**
+	 * @deprecated 9.1.0 use registerBackendProvider()
 	 * @param Backend[] $backends
 	 */
 	public function registerBackends(array $backends) {
@@ -105,6 +149,7 @@ class BackendService {
 	/**
 	 * Register an authentication mechanism
 	 *
+	 * @deprecated 9.1.0 use registerAuthMechanismProvider()
 	 * @param AuthMechanism $authMech
 	 */
 	public function registerAuthMechanism(AuthMechanism $authMech) {
@@ -117,6 +162,7 @@ class BackendService {
 	}
 
 	/**
+	 * @deprecated 9.1.0 use registerAuthMechanismProvider()
 	 * @param AuthMechanism[] $mechanisms
 	 */
 	public function registerAuthMechanisms(array $mechanisms) {
@@ -131,6 +177,7 @@ class BackendService {
 	 * @return Backend[]
 	 */
 	public function getBackends() {
+		$this->loadBackendProviders();
 		// only return real identifiers, no aliases
 		$backends = [];
 		foreach ($this->backends as $backend) {
@@ -155,6 +202,7 @@ class BackendService {
 	 * @return Backend|null
 	 */
 	public function getBackend($identifier) {
+		$this->loadBackendProviders();
 		if (isset($this->backends[$identifier])) {
 			return $this->backends[$identifier];
 		}
@@ -167,6 +215,7 @@ class BackendService {
 	 * @return AuthMechanism[]
 	 */
 	public function getAuthMechanisms() {
+		$this->loadAuthMechanismProviders();
 		// only return real identifiers, no aliases
 		$mechanisms = [];
 		foreach ($this->authMechanisms as $mechanism) {
@@ -192,6 +241,7 @@ class BackendService {
 	 * @return AuthMechanism|null
 	 */
 	public function getAuthMechanism($identifier) {
+		$this->loadAuthMechanismProviders();
 		if (isset($this->authMechanisms[$identifier])) {
 			return $this->authMechanisms[$identifier];
 		}

apps/files_external/tests/service/backendservicetest.php

@@ -49,6 +49,20 @@ class BackendServiceTest extends \Test\TestCase {
 		return $backend;
 	}
 
+	/**
+	 * @param string $class
+	 *
+	 * @return \OCA\Files_External\Lib\Auth\AuthMechanism
+	 */
+	protected function getAuthMechanismMock($class) {
+		$backend = $this->getMockBuilder('\OCA\Files_External\Lib\Auth\AuthMechanism')
+			->disableOriginalConstructor()
+			->getMock();
+		$backend->method('getIdentifier')->will($this->returnValue('identifier:'.$class));
+		$backend->method('getIdentifierAliases')->will($this->returnValue(['identifier:'.$class]));
+		return $backend;
+	}
+
 	public function testRegisterBackend() {
 		$service = new BackendService($this->config, $this->l10n);
 
@@ -76,6 +90,68 @@ class BackendServiceTest extends \Test\TestCase {
 		$this->assertArrayNotHasKey('identifier_alias', $backends);
 	}
 
+	public function testBackendProvider() {
+		$service = new BackendService($this->config, $this->l10n);
+
+		$backend1 = $this->getBackendMock('\Foo\Bar');
+		$backend2 = $this->getBackendMock('\Bar\Foo');
+
+		$providerMock = $this->getMock('\OCA\Files_External\Lib\Config\IBackendProvider');
+		$providerMock->expects($this->once())
+			->method('getBackends')
+			->willReturn([$backend1, $backend2]);
+		$service->registerBackendProvider($providerMock);
+
+		$this->assertEquals($backend1, $service->getBackend('identifier:\Foo\Bar'));
+		$this->assertEquals($backend2, $service->getBackend('identifier:\Bar\Foo'));
+
+		$this->assertCount(2, $service->getBackends());
+	}
+
+	public function testAuthMechanismProvider() {
+		$service = new BackendService($this->config, $this->l10n);
+
+		$backend1 = $this->getAuthMechanismMock('\Foo\Bar');
+		$backend2 = $this->getAuthMechanismMock('\Bar\Foo');
+
+		$providerMock = $this->getMock('\OCA\Files_External\Lib\Config\IAuthMechanismProvider');
+		$providerMock->expects($this->once())
+			->method('getAuthMechanisms')
+			->willReturn([$backend1, $backend2]);
+		$service->registerAuthMechanismProvider($providerMock);
+
+		$this->assertEquals($backend1, $service->getAuthMechanism('identifier:\Foo\Bar'));
+		$this->assertEquals($backend2, $service->getAuthMechanism('identifier:\Bar\Foo'));
+
+		$this->assertCount(2, $service->getAuthMechanisms());
+	}
+
+	public function testMultipleBackendProviders() {
+		$service = new BackendService($this->config, $this->l10n);
+
+		$backend1a = $this->getBackendMock('\Foo\Bar');
+		$backend1b = $this->getBackendMock('\Bar\Foo');
+
+		$backend2 = $this->getBackendMock('\Dead\Beef');
+
+		$provider1Mock = $this->getMock('\OCA\Files_External\Lib\Config\IBackendProvider');
+		$provider1Mock->expects($this->once())
+			->method('getBackends')
+			->willReturn([$backend1a, $backend1b]);
+		$service->registerBackendProvider($provider1Mock);
+		$provider2Mock = $this->getMock('\OCA\Files_External\Lib\Config\IBackendProvider');
+		$provider2Mock->expects($this->once())
+			->method('getBackends')
+			->willReturn([$backend2]);
+		$service->registerBackendProvider($provider2Mock);
+
+		$this->assertEquals($backend1a, $service->getBackend('identifier:\Foo\Bar'));
+		$this->assertEquals($backend1b, $service->getBackend('identifier:\Bar\Foo'));
+		$this->assertEquals($backend2, $service->getBackend('identifier:\Dead\Beef'));
+
+		$this->assertCount(3, $service->getBackends());
+	}
+
 	public function testUserMountingBackends() {
 		$this->config->expects($this->exactly(2))
 			->method('getAppValue')