Add user provided credentials mechanism

apps/files_external/appinfo/application.php

@@ -109,6 +109,7 @@ class Application extends App {
 			$container->query('OCA\Files_External\Lib\Auth\Password\Password'),
 			$container->query('OCA\Files_External\Lib\Auth\Password\SessionCredentials'),
 			$container->query('OCA\Files_External\Lib\Auth\Password\LoginCredentials'),
+			$container->query('OCA\Files_External\Lib\Auth\Password\UserProvided'),
 
 			// AuthMechanism::SCHEME_OAUTH1 mechanisms
 			$container->query('OCA\Files_External\Lib\Auth\OAuth1\OAuth1'),

apps/files_external/appinfo/routes.php

@@ -44,7 +44,12 @@ namespace OCA\Files_External\AppInfo;
 				'url' => '/ajax/public_key.php',
 				'verb' => 'POST',
 				'requirements' => array()
-			)
+			),
+			[
+				'name' => 'UserCredentials#store',
+				'url' => '/usercredentials/{storageId}',
+				'verb' => 'PUT'
+			]
 		)
 	)
 );

apps/files_external/controller/usercredentialscontroller.php

@@ -0,0 +1,57 @@
+<?php
+/**
+ * @author Robin Appelman <icewind@owncloud.com>
+ *
+ * @copyright Copyright (c) 2015, 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\Controller;
+
+use OCA\Files_External\Lib\Auth\Password\UserProvided;
+use OCP\AppFramework\Controller;
+use OCP\IRequest;
+use OCP\IUserSession;
+
+class UserCredentialsController extends Controller {
+	/**
+	 * @var UserProvided
+	 */
+	private $authMechanism;
+
+	/**
+	 * @var IUserSession
+	 */
+	private $userSession;
+
+	public function __construct($appName, IRequest $request, UserProvided $authMechanism, IUserSession $userSession) {
+		parent::__construct($appName, $request);
+		$this->authMechanism = $authMechanism;
+		$this->userSession = $userSession;
+	}
+
+	/**
+	 * @param int $storageId
+	 * @param string $username
+	 * @param string $password
+	 *
+	 * @NoAdminRequired
+	 * @NoCSRFRequired
+	 */
+	public function store($storageId, $username, $password) {
+		$this->authMechanism->saveCredentials($this->userSession->getUser(), $storageId, $username, $password);
+	}
+}

apps/files_external/lib/auth/password/userprovided.php

@@ -0,0 +1,78 @@
+<?php
+/**
+ * @author Robin Appelman <icewind@owncloud.com>
+ *
+ * @copyright Copyright (c) 2015, 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\Auth\Password;
+
+use OCP\IL10N;
+use OCP\IUser;
+use OCA\Files_External\Lib\Auth\AuthMechanism;
+use OCA\Files_External\Lib\StorageConfig;
+use OCP\Security\ICredentialsManager;
+use OCP\Files\Storage;
+use OCA\Files_External\Lib\InsufficientDataForMeaningfulAnswerException;
+
+/**
+ * User provided Username and Password
+ */
+class UserProvided extends AuthMechanism {
+
+	const CREDENTIALS_IDENTIFIER_PREFIX = 'password::userprovided/';
+
+	/** @var ICredentialsManager */
+	protected $credentialsManager;
+
+	public function __construct(IL10N $l, ICredentialsManager $credentialsManager) {
+		$this->credentialsManager = $credentialsManager;
+
+		$this
+			->setIdentifier('password::userprovided')
+			->setScheme(self::SCHEME_PASSWORD)
+			->setText($l->t('User provided'))
+			->addParameters([]);
+	}
+
+	private function getCredentialsIdentifier($storageId) {
+		return self::CREDENTIALS_IDENTIFIER_PREFIX . $storageId;
+	}
+
+	public function saveCredentials(IUser $user, $id, $username, $password) {
+		$this->credentialsManager->store($user->getUID(), $this->getCredentialsIdentifier($id), [
+			'user' => $username,
+			'password' => $password
+		]);
+	}
+
+	public function manipulateStorageConfig(StorageConfig &$storage, IUser $user = null) {
+		if (!isset($user)) {
+			throw new InsufficientDataForMeaningfulAnswerException('No credentials saved');
+		}
+		$uid = $user->getUID();
+		$credentials = $this->credentialsManager->retrieve($uid, $this->getCredentialsIdentifier($storage->getId()));
+
+		if (!isset($credentials)) {
+			throw new InsufficientDataForMeaningfulAnswerException('No credentials saved');
+		}
+
+		$storage->setBackendOption('user', $credentials['user']);
+		$storage->setBackendOption('password', $credentials['password']);
+	}
+
+}