implement verification for additional mails

- mails added by (sub)admins are automatically verified
- provisioning_api controller as verification endpoint
- IAccountProperty gets a locallyVerified property
- IPropertyCollection gets a method to fetch an IAccountProperty by value
  - an remove equivalent was already present
- AccountManager always initiates mail verification on update if necessary
- add core success template for arbitrary title and message

Signed-off-by: Arthur Schiwon <blizzz@arthur-schiwon.de>

2 files changed, 131 insertions, 4 deletions

diff --git a/apps/provisioning_api/lib/Controller/UsersController.php b/apps/provisioning_api/lib/Controller/UsersController.php
index a0eda5848ec..aae34975c25 100644
--- a/apps/provisioning_api/lib/Controller/UsersController.php
+++ b/apps/provisioning_api/lib/Controller/UsersController.php
@@ -621,6 +621,10 @@ class UsersController extends AUserData {
 			throw new OCSException('', OCSController::RESPOND_NOT_FOUND);
 		}
 
+		$subAdminManager = $this->groupManager->getSubAdmin();
+		$isAdminOrSubadmin = $this->groupManager->isAdmin($currentLoggedInUser->getUID())
+			|| $subAdminManager->isUserAccessible($currentLoggedInUser, $targetUser);
+
 		$permittedFields = [];
 		if ($targetUser->getUID() === $currentLoggedInUser->getUID()) {
 			// Editing self (display, email)
@@ -628,11 +632,8 @@ class UsersController extends AUserData {
 			$permittedFields[] = IAccountManager::COLLECTION_EMAIL . self::SCOPE_SUFFIX;
 		} else {
 			// Check if admin / subadmin
-			$subAdminManager = $this->groupManager->getSubAdmin();
-			if ($this->groupManager->isAdmin($currentLoggedInUser->getUID())
-				|| $subAdminManager->isUserAccessible($currentLoggedInUser, $targetUser)) {
+			if ($isAdminOrSubadmin) {
 				// They have permissions over the user
-
 				$permittedFields[] = IAccountManager::COLLECTION_EMAIL;
 			} else {
 				// No rights
@@ -652,6 +653,11 @@ class UsersController extends AUserData {
 				$mailCollection->removePropertyByValue($key);
 				if ($value !== '') {
 					$mailCollection->addPropertyWithDefaults($value);
+					$property = $mailCollection->getPropertyByValue($key);
+					if ($isAdminOrSubadmin && $property) {
+						// admin set mails are auto-verified
+						$property->setLocallyVerified(IAccountManager::VERIFIED);
+					}
 				}
 				$this->accountManager->updateAccount($userAccount);
 				break;
diff --git a/apps/provisioning_api/lib/Controller/VerificationController.php b/apps/provisioning_api/lib/Controller/VerificationController.php
new file mode 100644
index 00000000000..b248d3e8285
--- /dev/null
+++ b/apps/provisioning_api/lib/Controller/VerificationController.php
@@ -0,0 +1,121 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * @copyright Copyright (c) 2021 Arthur Schiwon <blizzz@arthur-schiwon.de>
+ *
+ * @author Arthur Schiwon <blizzz@arthur-schiwon.de>
+ *
+ * @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 <https://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace OCA\Provisioning_API\Controller;
+
+use InvalidArgumentException;
+use OC\Security\Crypto;
+use OCP\Accounts\IAccountManager;
+use OCP\AppFramework\Controller;
+use OCP\AppFramework\Http\TemplateResponse;
+use OCP\IL10N;
+use OCP\IRequest;
+use OCP\IUserManager;
+use OCP\IUserSession;
+use OCP\Security\VerificationToken\InvalidTokenException;
+use OCP\Security\VerificationToken\IVerificationToken;
+
+class VerificationController extends Controller {
+
+	/** @var IVerificationToken */
+	private $verificationToken;
+	/** @var IUserManager */
+	private $userManager;
+	/** @var IL10N */
+	private $l10n;
+	/** @var IUserSession */
+	private $userSession;
+	/** @var IAccountManager */
+	private $accountManager;
+	/** @var Crypto */
+	private $crypto;
+
+	public function __construct(
+		string $appName,
+		IRequest $request,
+		IVerificationToken $verificationToken,
+		IUserManager $userManager,
+		IL10N $l10n,
+		IUserSession $userSession,
+		IAccountManager $accountManager,
+		Crypto $crypto
+	) {
+		parent::__construct($appName, $request);
+		$this->verificationToken = $verificationToken;
+		$this->userManager = $userManager;
+		$this->l10n = $l10n;
+		$this->userSession = $userSession;
+		$this->accountManager = $accountManager;
+		$this->crypto = $crypto;
+	}
+
+	/**
+	 * @NoCSRFRequired
+	 */
+	public function verifyMail(string $token, string $userId, string $key) {
+		try {
+			if ($this->userSession->getUser()->getUID() !== $userId) {
+				throw new InvalidArgumentException('Logged in user is not mail address owner');
+			}
+			$email = $this->crypto->decrypt($key);
+			$ref = \substr(hash('sha256', $email), 0, 8);
+
+			$user = $this->userManager->get($userId);
+			$this->verificationToken->check($token, $user, 'verifyMail' . $ref, $email);
+
+			$userAccount = $this->accountManager->getAccount($user);
+			$emailProperty = $userAccount->getPropertyCollection(IAccountManager::COLLECTION_EMAIL)
+				->getPropertyByValue($email);
+
+			if ($emailProperty === null) {
+				throw new InvalidArgumentException($this->l10n->t('Email was already removed from account and cannot be confirmed anymore.'));
+			}
+			$emailProperty->setLocallyVerified(IAccountManager::VERIFIED);
+			$this->accountManager->updateAccount($userAccount);
+		} catch (InvalidTokenException $e) {
+			$error = $e->getCode() === InvalidTokenException::TOKEN_EXPIRED
+				? $this->l10n->t('Could not verify mail because the token is expired.')
+				: $this->l10n->t('Could not verify mail because the token is invalid.');
+		} catch (InvalidArgumentException $e) {
+			$error = $e->getMessage();
+		} catch (\Exception $e) {
+			$error = $this->l10n->t('An unexpected error occurred. Please consult your sysadmin.');
+		}
+
+		if (isset($error)) {
+			return new TemplateResponse(
+				'core', 'error', [
+					'errors' => [['error' => $error]]
+				], 'guest');
+		}
+
+		return new TemplateResponse(
+			'core', 'success', [
+				'title' => $this->l10n->t('Email confirmation successful'),
+				'message' => $this->l10n->t('Email confirmation successful'),
+			], 'guest');
+	}
+}