warn before sending to many recipients in to/cc

Signed-off-by: Matthias <git@myrho.net>

2 files changed, 40 insertions, 1 deletions

diff --git a/lib/Controller/AccountsController.php b/lib/Controller/AccountsController.php
index be3947fbb..893a750d7 100644
--- a/lib/Controller/AccountsController.php
+++ b/lib/Controller/AccountsController.php
@@ -35,6 +35,7 @@ use OCA\Mail\Contracts\IMailManager;
 use OCA\Mail\Contracts\IMailTransmission;
 use OCA\Mail\Db\Mailbox;
 use OCA\Mail\Exception\ClientException;
+use OCA\Mail\Exception\ManyRecipientsException;
 use OCA\Mail\Exception\ServiceException;
 use OCA\Mail\Http\JsonResponse as MailJsonResponse;
 use OCA\Mail\Model\NewMessageData;
@@ -383,7 +384,8 @@ class AccountsController extends Controller {
 						 int $draftId = null,
 						 int $messageId = null,
 						 array $attachments = [],
-						 int $aliasId = null): JSONResponse {
+						 int $aliasId = null,
+						 bool $force = false): JSONResponse {
 		$account = $this->accountService->find($this->currentUserId, $id);
 		$alias = $aliasId ? $this->aliasesService->find($aliasId, $this->currentUserId) : null;
 
@@ -391,6 +393,11 @@ class AccountsController extends Controller {
 		$expandedCc = $this->groupsIntegration->expand($cc);
 		$expandedBcc = $this->groupsIntegration->expand($bcc);
 
+		$count = substr_count($expandedTo, ',') + substr_count($expandedCc, ',');
+		if (!$force && $count >= 10) {
+			throw new ManyRecipientsException();
+		}
+
 		$messageData = NewMessageData::fromRequest($account, $expandedTo, $expandedCc, $expandedBcc, $subject, $body, $attachments, $isHtml, $requestMdn);
 		$repliedMessageData = null;
 		if ($messageId !== null) {
diff --git a/lib/Exception/ManyRecipientsException.php b/lib/Exception/ManyRecipientsException.php
new file mode 100644
index 000000000..e90d3c01d
--- /dev/null
+++ b/lib/Exception/ManyRecipientsException.php
@@ -0,0 +1,32 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * @copyright 2021 Christoph Wurst <christoph@winzerhof-wurst.at>
+ *
+ * @author 2021 Matthias Rella <mrella@pisys.eu>
+ *
+ * @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/>.
+ */
+
+namespace OCA\Mail\Exception;
+
+class ManyRecipientsException extends ClientException {
+	public function __construct() {
+		parent::__construct("Many recipients in TO and/or CC");
+	}
+}