From d5407764d7fe9c1a7e32fd44afe01eaf4bf7b4ed Mon Sep 17 00:00:00 2001
From: Christoph Wurst <christoph@winzerhof-wurst.at>
Date: Thu, 11 Feb 2021 13:27:02 +0100
Subject: [PATCH] Do not send imip email to invalid recipients

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>
---
 apps/dav/lib/CalDAV/Schedule/IMipPlugin.php        |  5 +++++
 .../tests/unit/CalDAV/Schedule/IMipPluginTest.php  | 14 ++++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/apps/dav/lib/CalDAV/Schedule/IMipPlugin.php b/apps/dav/lib/CalDAV/Schedule/IMipPlugin.php
index e360273383..8161272955 100644
--- a/apps/dav/lib/CalDAV/Schedule/IMipPlugin.php
+++ b/apps/dav/lib/CalDAV/Schedule/IMipPlugin.php
@@ -178,6 +178,11 @@ class IMipPlugin extends SabreIMipPlugin {
 		// Strip off mailto:
 		$sender = substr($iTipMessage->sender, 7);
 		$recipient = substr($iTipMessage->recipient, 7);
+		if (!$this->mailer->validateMailAddress($recipient)) {
+			// Nothing to send if the recipient doesn't have a valid email address
+			$iTipMessage->scheduleStatus = '5.0; EMail delivery failed';
+			return;
+		}
 
 		$senderName = $iTipMessage->senderName ?: null;
 		$recipientName = $iTipMessage->recipientName ?: null;
diff --git a/apps/dav/tests/unit/CalDAV/Schedule/IMipPluginTest.php b/apps/dav/tests/unit/CalDAV/Schedule/IMipPluginTest.php
index a31fdfdc5f..3b2abd8575 100644
--- a/apps/dav/tests/unit/CalDAV/Schedule/IMipPluginTest.php
+++ b/apps/dav/tests/unit/CalDAV/Schedule/IMipPluginTest.php
@@ -140,6 +140,7 @@ class IMipPluginTest extends TestCase {
 			->method('getAppValue')
 			->with('dav', 'invitation_link_recipients', 'yes')
 			->willReturn('yes');
+		$this->mailer->method('validateMailAddress')->willReturn(true);
 
 		$message = $this->_testMessage();
 		$this->_expectSend();
@@ -153,6 +154,7 @@ class IMipPluginTest extends TestCase {
 			->method('getAppValue')
 			->with('dav', 'invitation_link_recipients', 'yes')
 			->willReturn('yes');
+		$this->mailer->method('validateMailAddress')->willReturn(true);
 
 		$message = $this->_testMessage();
 		$this->mailer
@@ -163,12 +165,21 @@ class IMipPluginTest extends TestCase {
 		$this->assertEquals('5.0', $message->getScheduleStatus());
 	}
 
+	public function testInvalidEmailDelivery() {
+		$this->mailer->method('validateMailAddress')->willReturn(false);
+
+		$message = $this->_testMessage();
+		$this->plugin->schedule($message);
+		$this->assertEquals('5.0', $message->getScheduleStatus());
+	}
+
 	public function testDeliveryWithNoCommonName() {
 		$this->config
 	  ->expects($this->at(1))
 			->method('getAppValue')
 			->with('dav', 'invitation_link_recipients', 'yes')
 			->willReturn('yes');
+		$this->mailer->method('validateMailAddress')->willReturn(true);
 
 		$message = $this->_testMessage();
 		$message->senderName = null;
@@ -193,6 +204,7 @@ class IMipPluginTest extends TestCase {
 		$this->config
 	  ->method('getAppValue')
 	  ->willReturn('yes');
+		$this->mailer->method('validateMailAddress')->willReturn(true);
 
 		$message = $this->_testMessage($veventParams);
 
@@ -227,6 +239,7 @@ class IMipPluginTest extends TestCase {
 	 */
 	public function testIncludeResponseButtons(string $config_setting, string $recipient, bool $has_buttons) {
 		$message = $this->_testMessage([],$recipient);
+		$this->mailer->method('validateMailAddress')->willReturn(true);
 
 		$this->_expectSend($recipient, true, $has_buttons);
 		$this->config
@@ -256,6 +269,7 @@ class IMipPluginTest extends TestCase {
 		$this->config
 			->method('getAppValue')
 			->willReturn('yes');
+		$this->mailer->method('validateMailAddress')->willReturn(true);
 
 		$message = $this->_testMessage(['SUMMARY' => '']);
 		$this->_expectSend('frodo@hobb.it', true, true,'Invitation: Untitled event');