fix: guest joins room

fix #50

lib/BigBlueButton/API.php

@@ -58,7 +58,7 @@ class API
 	 *
 	 * @return string join url
 	 */
-	public function createJoinUrl(Room $room, int $creationTime, string $displayname, string $uid = null)
+	public function createJoinUrl(Room $room, int $creationTime, string $displayname, ?string $uid = null)
 	{
 		$password = $this->permission->isModerator($room, $uid) ? $room->moderatorPassword : $room->attendeePassword;
 

lib/Permission.php

@@ -25,14 +25,14 @@ class Permission
 		$this->roomShareService = $roomShareService;
 	}
 
-	public function isUser(Room $room, string $uid)
+	public function isUser(Room $room, ?string $uid)
 	{
 		return $this->hasPermission($room, $uid, function (RoomShare $share) {
 			return $share->hasUserPermission();
 		});
 	}
 
-	public function isModerator(Room $room, string $uid)
+	public function isModerator(Room $room, ?string $uid)
 	{
 		if ($room->everyoneIsModerator) {
 			return true;
@@ -43,14 +43,14 @@ class Permission
 		});
 	}
 
-	public function isAdmin(Room $room, string $uid)
+	public function isAdmin(Room $room, ?string $uid)
 	{
 		return $this->hasPermission($room, $uid, function (RoomShare $share) {
 			return $share->hasAdminPermission();
 		});
 	}
 
-	private function hasPermission(Room $room, string $uid, Closure $hasPermission): bool
+	private function hasPermission(Room $room, ?string $uid, Closure $hasPermission): bool
 	{
 		if ($uid === null) {
 			return false;

tests/Unit/PermissionTest.php

@@ -0,0 +1,90 @@
+<?php
+namespace OCA\BigBlueButton\Tests;
+
+use OCA\BigBlueButton\Db\Room;
+use OCA\BigBlueButton\Db\RoomShare;
+use OCA\BigBlueButton\Permission;
+use OCA\BigBlueButton\Service\RoomShareService;
+use OCP\IGroupManager;
+use PHPUnit\Framework\MockObject\MockObject;
+use PHPUnit\Framework\TestCase;
+
+class PermissionTest extends TestCase
+{
+	/** @var Permission */
+	private $permission;
+
+	/** @var IGroupManager|MockObject */
+	private $groupManager;
+
+	/** @var RoomShareService|MockObject */
+	private $roomShareService;
+
+	public function setUp(): void
+	{
+		parent::setUp();
+
+		/** @var IGroupManager|MockObject */
+		$this->groupManager = $this->createMock(IGroupManager::class);
+
+		/** @var RoomShareService|MockObject */
+		$this->roomShareService = $this->createMock(RoomShareService::class);
+
+		$this->permission = new Permission(
+			$this->groupManager,
+			$this->roomShareService
+		);
+	}
+
+	public function testIsUser()
+	{
+		$room = $this->createRoom(1, 'foo');
+
+		$this->roomShareService
+			->expects($this->exactly(4))
+			->method('findAll')
+			->will($this->returnValueMap([
+				[1, [
+					$this->createRoomShare(RoomShare::SHARE_TYPE_USER, 'user', RoomShare::PERMISSION_ADMIN),
+					$this->createRoomShare(RoomShare::SHARE_TYPE_GROUP, 'group', RoomShare::PERMISSION_MODERATOR),
+				]],
+				[2, []],
+			]));
+
+		$this->groupManager
+			->method('isInGroup')
+			->will($this->returnValueMap([
+				['bar', 'group', false],
+				['group_user', 'group', true],
+			]));
+
+		$this->assertFalse($this->permission->isUser($room, null), 'Test guest user');
+		$this->assertFalse($this->permission->isUser($room, 'bar'), 'Test no matching share');
+		$this->assertFalse($this->permission->isUser($this->createRoom(2, 'foo'), 'bar'), 'Test empty shares');
+
+		$this->assertTrue($this->permission->isUser($room, 'foo'), 'Test room owner');
+		$this->assertTrue($this->permission->isUser($room, 'user'));
+		$this->assertTrue($this->permission->isUser($room, 'group_user'));
+	}
+
+	private function createRoom(int $id, string $userId): Room
+	{
+		$room = new Room();
+
+		$room->setId($id);
+		$room->setUserId($userId);
+
+		return $room;
+	}
+
+	private function createRoomShare(int $type, string $with, int $permission): RoomShare
+	{
+		$share = new RoomShare();
+
+		$share->setShareType($type);
+		$share->setShareWith($with);
+		$share->setPermission($permission);
+
+		return $share;
+	}
+}