Check if the offset exists before accessing

This checks if the offset exists before accessing it and also adds unit tests to this function which would have catched this before :see_no_evil:

Fixes https://github.com/owncloud/core/issues/14277

apps/files/controller/apicontroller.php

@@ -1,6 +1,6 @@
 <?php
 /**
- * Copyright (c) 2014 Lukas Reschke <lukas@owncloud.com>
+ * Copyright (c) 2014-2015 Lukas Reschke <lukas@owncloud.com>
  * This file is licensed under the Affero General Public License version 3 or
  * later.
  * See the COPYING-README file.
@@ -17,19 +17,27 @@ use OCP\AppFramework\Http\DownloadResponse;
 use OC\Preview;
 use OCA\Files\Service\TagService;
 
+/**
+ * Class ApiController
+ *
+ * @package OCA\Files\Controller
+ */
 class ApiController extends Controller {
+	/** @var TagService */
+	private $tagService;
 
 	/**
-	 * @var TagService $tagService
+	 * @param string $appName
+	 * @param IRequest $request
+	 * @param TagService $tagService
 	 */
-	private $tagService;
-
-	public function __construct($appName, IRequest $request, TagService $tagService){
+	public function __construct($appName,
+								IRequest $request,
+								TagService $tagService){
 		parent::__construct($appName, $request);
 		$this->tagService = $tagService;
 	}
 
-
 	/**
 	 * Gets a thumbnail of the specified file
 	 *
@@ -66,25 +74,31 @@ class ApiController extends Controller {
 	 * @CORS
 	 *
 	 * @param string $path path
-	 * @param array  $tags array of tags
+	 * @param array|string $tags array of tags
 	 * @return DataResponse
 	 */
 	public function updateFileTags($path, $tags = null) {
-		$result = array();
+		$result = [];
 		// if tags specified or empty array, update tags
 		if (!is_null($tags)) {
 			try {
 				$this->tagService->updateFileTags($path, $tags);
 			} catch (\OCP\Files\NotFoundException $e) {
-				return new DataResponse(['message' => $e->getMessage()], Http::STATUS_NOT_FOUND);
+				return new DataResponse([
+					'message' => $e->getMessage()
+				], Http::STATUS_NOT_FOUND);
 			} catch (\OCP\Files\StorageNotAvailableException $e) {
-				return new DataResponse(['message' => $e->getMessage()], Http::STATUS_SERVICE_UNAVAILABLE);
+				return new DataResponse([
+					'message' => $e->getMessage()
+				], Http::STATUS_SERVICE_UNAVAILABLE);
 			} catch (\Exception $e) {
-				return new DataResponse(['message' => $e->getMessage()], Http::STATUS_NOT_FOUND);
+				return new DataResponse([
+					'message' => $e->getMessage()
+				], Http::STATUS_NOT_FOUND);
 			}
 			$result['tags'] = $tags;
 		}
-		return new DataResponse($result, Http::STATUS_OK);
+		return new DataResponse($result);
 	}
 
 	/**
@@ -93,7 +107,7 @@ class ApiController extends Controller {
 	 * @NoAdminRequired
 	 * @CORS
 	 *
-	 * @param array $tagName tag name to filter by
+	 * @param array|string $tagName tag name to filter by
 	 * @return DataResponse
 	 */
 	public function getFilesByTag($tagName) {
@@ -102,11 +116,15 @@ class ApiController extends Controller {
 		foreach ($fileInfos as &$fileInfo) {
 			$file = \OCA\Files\Helper::formatFileInfo($fileInfo);
 			$parts = explode('/', dirname($fileInfo->getPath()), 4);
-			$file['path'] = '/' . $parts[3];
-			$file['tags'] = array($tagName);
+			if(isset($parts[3])) {
+				$file['path'] = '/' . $parts[3];
+			} else {
+				$file['path'] = '/';
+			}
+			$file['tags'] = [$tagName];
 			$files[] = $file;
 		}
-		return new DataResponse(array('files' => $files), Http::STATUS_OK);
+		return new DataResponse(['files' => $files]);
 	}
 
 }

apps/files/tests/controller/apicontrollertest.php

@@ -0,0 +1,243 @@
+<?php
+/**
+ * Copyright (c) 2015 Lukas Reschke <lukas@owncloud.com>
+ * This file is licensed under the Affero General Public License version 3 or
+ * later.
+ * See the COPYING-README file.
+ */
+
+namespace OCA\Files\Controller;
+
+use OC\Files\FileInfo;
+use OCP\AppFramework\Http;
+use OC\Preview;
+use OCP\Files\NotFoundException;
+use OCP\Files\StorageNotAvailableException;
+use Test\TestCase;
+use OCP\IRequest;
+use OCA\Files\Service\TagService;
+use OCP\AppFramework\Http\DataResponse;
+
+/**
+ * Class ApiController
+ *
+ * @package OCA\Files\Controller
+ */
+class ApiControllerTest extends TestCase {
+	/** @var string */
+	private $appName = 'files';
+	/** @var IRequest */
+	private $request;
+	/** @var TagService */
+	private $tagService;
+	/** @var ApiController */
+	private $apiController;
+
+	public function setUp() {
+		$this->request = $this->getMockBuilder('\OCP\IRequest')
+			->disableOriginalConstructor()
+			->getMock();
+		$this->tagService = $this->getMockBuilder('\OCA\Files\Service\TagService')
+			->disableOriginalConstructor()
+			->getMock();
+
+		$this->apiController = new ApiController(
+			$this->appName,
+			$this->request,
+			$this->tagService
+		);
+	}
+
+	public function testGetFilesByTagEmpty() {
+		$tagName = 'MyTagName';
+		$this->tagService->expects($this->once())
+			->method('getFilesByTag')
+			->with($this->equalTo([$tagName]))
+			->will($this->returnValue([]));
+
+		$expected = new DataResponse(['files' => []]);
+		$this->assertEquals($expected, $this->apiController->getFilesByTag([$tagName]));
+	}
+
+	public function testGetFilesByTagSingle() {
+		$tagName = 'MyTagName';
+		$fileInfo = new FileInfo(
+			'/root.txt',
+			$this->getMockBuilder('\OC\Files\Storage\Storage')
+				->disableOriginalConstructor()
+				->getMock(),
+			'/var/www/root.txt',
+			[
+				'mtime' => 55,
+				'mimetype' => 'application/pdf',
+				'size' => 1234,
+				'etag' => 'MyEtag',
+			],
+			$this->getMockBuilder('\OCP\Files\Mount\IMountPoint')
+				->disableOriginalConstructor()
+				->getMock()
+		);
+		$this->tagService->expects($this->once())
+			->method('getFilesByTag')
+			->with($this->equalTo([$tagName]))
+			->will($this->returnValue([$fileInfo]));
+
+		$expected = new DataResponse([
+			'files' => [
+				[
+					'id' => null,
+					'parentId' => null,
+					'date' => 'January 1, 1970 at 12:00:55 AM GMT+0',
+					'mtime' => 55000,
+					'icon' => \OCA\Files\Helper::determineIcon($fileInfo),
+					'name' => 'root.txt',
+					'permissions' => null,
+					'mimetype' => 'application/pdf',
+					'size' => 1234,
+					'type' => 'file',
+					'etag' => 'MyEtag',
+					'path' => '/',
+					'tags' => [
+						[
+							'MyTagName'
+						]
+					],
+				],
+			],
+		]);
+		$this->assertEquals($expected, $this->apiController->getFilesByTag([$tagName]));
+	}
+
+	public function testGetFilesByTagMultiple() {
+		$tagName = 'MyTagName';
+		$fileInfo1 = new FileInfo(
+			'/root.txt',
+			$this->getMockBuilder('\OC\Files\Storage\Storage')
+				->disableOriginalConstructor()
+				->getMock(),
+			'/var/www/root.txt',
+			[
+				'mtime' => 55,
+				'mimetype' => 'application/pdf',
+				'size' => 1234,
+				'etag' => 'MyEtag',
+			],
+			$this->getMockBuilder('\OCP\Files\Mount\IMountPoint')
+				->disableOriginalConstructor()
+				->getMock()
+		);
+		$fileInfo2 = new FileInfo(
+			'/root.txt',
+			$this->getMockBuilder('\OC\Files\Storage\Storage')
+				->disableOriginalConstructor()
+				->getMock(),
+			'/var/www/some/sub.txt',
+			[
+				'mtime' => 999,
+				'mimetype' => 'application/binary',
+				'size' => 9876,
+				'etag' => 'SubEtag',
+			],
+			$this->getMockBuilder('\OCP\Files\Mount\IMountPoint')
+				->disableOriginalConstructor()
+				->getMock()
+		);
+		$this->tagService->expects($this->once())
+			->method('getFilesByTag')
+			->with($this->equalTo([$tagName]))
+			->will($this->returnValue([$fileInfo1, $fileInfo2]));
+
+		$expected = new DataResponse([
+			'files' => [
+				[
+					'id' => null,
+					'parentId' => null,
+					'date' => 'January 1, 1970 at 12:00:55 AM GMT+0',
+					'mtime' => 55000,
+					'icon' => \OCA\Files\Helper::determineIcon($fileInfo1),
+					'name' => 'root.txt',
+					'permissions' => null,
+					'mimetype' => 'application/pdf',
+					'size' => 1234,
+					'type' => 'file',
+					'etag' => 'MyEtag',
+					'path' => '/',
+					'tags' => [
+						[
+							'MyTagName'
+						]
+					],
+				],
+				[
+					'id' => null,
+					'parentId' => null,
+					'date' => 'January 1, 1970 at 12:16:39 AM GMT+0',
+					'mtime' => 999000,
+					'icon' => \OCA\Files\Helper::determineIcon($fileInfo2),
+					'name' => 'root.txt',
+					'permissions' => null,
+					'mimetype' => 'application/binary',
+					'size' => 9876,
+					'type' => 'file',
+					'etag' => 'SubEtag',
+					'path' => '/',
+					'tags' => [
+						[
+							'MyTagName'
+						]
+					],
+				]
+			],
+		]);
+		$this->assertEquals($expected, $this->apiController->getFilesByTag([$tagName]));
+	}
+
+	public function testUpdateFileTagsEmpty() {
+		$expected = new DataResponse([]);
+		$this->assertEquals($expected, $this->apiController->updateFileTags('/path.txt'));
+	}
+
+	public function testUpdateFileTagsWorking() {
+		$this->tagService->expects($this->once())
+			->method('updateFileTags')
+			->with('/path.txt', ['Tag1', 'Tag2']);
+
+		$expected = new DataResponse([
+			'tags' => [
+				'Tag1',
+				'Tag2'
+			],
+		]);
+		$this->assertEquals($expected, $this->apiController->updateFileTags('/path.txt', ['Tag1', 'Tag2']));
+	}
+
+	public function testUpdateFileTagsNotFoundException() {
+		$this->tagService->expects($this->once())
+			->method('updateFileTags')
+			->with('/path.txt', ['Tag1', 'Tag2'])
+			->will($this->throwException(new NotFoundException('My error message')));
+
+		$expected = new DataResponse(['message' => 'My error message'], Http::STATUS_NOT_FOUND);
+		$this->assertEquals($expected, $this->apiController->updateFileTags('/path.txt', ['Tag1', 'Tag2']));
+	}
+
+	public function testUpdateFileTagsStorageNotAvailableException() {
+		$this->tagService->expects($this->once())
+			->method('updateFileTags')
+			->with('/path.txt', ['Tag1', 'Tag2'])
+			->will($this->throwException(new StorageNotAvailableException('My error message')));
+
+		$expected = new DataResponse(['message' => 'My error message'], Http::STATUS_SERVICE_UNAVAILABLE);
+		$this->assertEquals($expected, $this->apiController->updateFileTags('/path.txt', ['Tag1', 'Tag2']));
+	}
+
+	public function testUpdateFileTagsStorageGenericException() {
+		$this->tagService->expects($this->once())
+			->method('updateFileTags')
+			->with('/path.txt', ['Tag1', 'Tag2'])
+			->will($this->throwException(new \Exception('My error message')));
+
+		$expected = new DataResponse(['message' => 'My error message'], Http::STATUS_NOT_FOUND);
+		$this->assertEquals($expected, $this->apiController->updateFileTags('/path.txt', ['Tag1', 'Tag2']));
+	}
+}