Do not throw errors when invalid setTo email is provided

Signed-off-by: Julius Härtl <jus@bitgrid.net>

lib/private/Mail/Message.php

@@ -78,14 +78,18 @@ class Message implements IMessage {
 		$convertedAddresses = [];
 
 		foreach ($addresses as $email => $readableName) {
-			if (!is_numeric($email)) {
-				[$name, $domain] = explode('@', $email, 2);
-				$domain = idn_to_ascii($domain, 0, INTL_IDNA_VARIANT_UTS46);
-				$convertedAddresses[$name.'@'.$domain] = $readableName;
+			$parsableEmail = is_numeric($email) ? $readableName : $email;
+			if (strpos($parsableEmail, '@') === false) {
+				$convertedAddresses[$parsableEmail] = $readableName;
+				continue;
+			}
+
+			[$name, $domain] = explode('@', $parsableEmail, 2);
+			$domain = idn_to_ascii($domain, 0, INTL_IDNA_VARIANT_UTS46);
+			if (is_numeric($email)) {
+				$convertedAddresses[] = $name . '@' . $domain;
 			} else {
-				[$name, $domain] = explode('@', $readableName, 2);
-				$domain = idn_to_ascii($domain, 0, INTL_IDNA_VARIANT_UTS46);
-				$convertedAddresses[$email] = $name.'@'.$domain;
+				$convertedAddresses[$name . '@' . $domain] = $readableName;
 			}
 		}
 

tests/lib/Mail/MessageTest.php

@@ -102,12 +102,23 @@ class MessageTest extends TestCase {
 		$this->assertSame('lukas@owncloud.com', $this->message->getReplyTo());
 	}
 
-	public function testSetTo() {
+	/** @dataProvider dataSetTo */
+	public function testSetTo(array $to, array $expected) {
 		$this->swiftMessage
 			->expects($this->once())
 			->method('setTo')
-			->with(['lukas@owncloud.com']);
-		$this->message->setTo(['lukas@owncloud.com']);
+			->with($expected);
+		$this->message->setTo($to);
+	}
+
+	public function dataSetTo(): array {
+		return [
+			[['robot@example.com'], ['robot@example.com']],
+			[['robot'], ['robot' => 'robot']],
+			[['robot' => 'robot display name'], ['robot' => 'robot display name']],
+			[['example@🤖.com'], ['example@xn--yp9h.com']],
+			[['example@🤖.com' => 'A robot'], ['example@xn--yp9h.com' => 'A robot']],
+		];
 	}
 
 	/**