fix(files_sharing): block downloading if needed

Signed-off-by: Ferdinand Thiessen <opensource@fthiessen.de>

apps/files_sharing/lib/Controller/ShareController.php

@@ -359,6 +359,11 @@ class ShareController extends AuthPublicShareController {
 			return new DataResponse('Share has no read permission');
 		}
 
+		$attributes = $share->getAttributes();
+		if ($attributes?->getAttribute('permissions', 'download') === false) {
+			return new DataResponse('Share has no download permission');
+		}
+
 		if (!$this->validateShare($share)) {
 			throw new NotFoundException();
 		}

apps/files_sharing/tests/Controller/ShareControllerTest.php

@@ -42,6 +42,7 @@ use OCP\IUserManager;
 use OCP\Security\ISecureRandom;
 use OCP\Server;
 use OCP\Share\Exceptions\ShareNotFound;
+use OCP\Share\IAttributes;
 use OCP\Share\IPublicShareTemplateFactory;
 use OCP\Share\IShare;
 use PHPUnit\Framework\MockObject\MockObject;
@@ -690,6 +691,34 @@ class ShareControllerTest extends \Test\TestCase {
 		$this->assertEquals($expectedResponse, $response);
 	}
 
+	public function testDownloadShareWithoutDownloadPermission(): void {
+		$attributes = $this->createMock(IAttributes::class);
+		$attributes->expects(self::once())
+			->method('getAttribute')
+			->with('permissions', 'download')
+			->willReturn(false);
+
+		$share = $this->createMock(IShare::class);
+		$share->method('getPassword')->willReturn('password');
+		$share->expects(self::once())
+			->method('getPermissions')
+			->willReturn(Constants::PERMISSION_READ);
+		$share->expects(self::once())
+			->method('getAttributes')
+			->willReturn($attributes);
+
+		$this->shareManager
+			->expects(self::once())
+			->method('getShareByToken')
+			->with('validtoken')
+			->willReturn($share);
+
+		// Test with a password protected share and no authentication
+		$response = $this->shareController->downloadShare('validtoken');
+		$expectedResponse = new DataResponse('Share has no download permission');
+		$this->assertEquals($expectedResponse, $response);
+	}
+
 	public function testDisabledOwner(): void {
 		$this->shareController->setToken('token');