Merge pull request #3988 from nextcloud/jscombiner

[PoC] JS Combiner

apps/files_sharing/appinfo/app.php

@@ -38,10 +38,8 @@ $eventDispatcher = \OC::$server->getEventDispatcher();
 $eventDispatcher->addListener(
 	'OCA\Files::loadAdditionalScripts',
 	function() {
-		\OCP\Util::addScript('files_sharing', 'share');
-		\OCP\Util::addScript('files_sharing', 'sharetabview');
-		\OCP\Util::addScript('files_sharing', 'sharebreadcrumbview');
 		\OCP\Util::addStyle('files_sharing', 'mergedAdditionalStyles');
+		\OCP\Util::addScript('files_sharing', 'additionalScripts');
 	}
 );
 

apps/files_sharing/js/additionalScripts.json

@@ -0,0 +1,5 @@
+[
+	"share.js",
+	"sharetabview.js",
+	"sharebreadcrumbview.js"
+]

core/Application.php

@@ -30,6 +30,8 @@
 
 namespace OC\Core;
 
+use OC\AppFramework\Utility\SimpleContainer;
+use OC\Core\Controller\JsController;
 use OC\Core\Controller\OCJSController;
 use OC\Security\IdentityProof\Manager;
 use OC\Server;
@@ -87,5 +89,13 @@ class Application extends App {
 				$server->getURLGenerator()
 			);
 		});
+		$container->registerService(JsController::class, function () use ($container) {
+			return new JsController(
+				$container->query('AppName'),
+				$container->query(IRequest::class),
+				$container->getServer()->getAppDataDir('js'),
+				$container->query(ITimeFactory::class)
+			);
+		});
 	}
 }

core/Controller/JsController.php

@@ -0,0 +1,80 @@
+<?php
+/**
+ * @copyright 2017, Roeland Jago Douma <roeland@famdouma.nl>
+ *
+ * @author Roeland Jago Douma <roeland@famdouma.nl>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+namespace OC\Core\Controller;
+
+use OCP\AppFramework\Controller;
+use OCP\AppFramework\Http;
+use OCP\AppFramework\Http\NotFoundResponse;
+use OCP\AppFramework\Http\FileDisplayResponse;
+use OCP\AppFramework\Utility\ITimeFactory;
+use OCP\Files\IAppData;
+use OCP\Files\NotFoundException;
+use OCP\IRequest;
+
+class JsController extends Controller {
+
+	/** @var IAppData */
+	protected $appData;
+
+	/** @var ITimeFactory */
+	protected $timeFactory;
+
+	/**
+	 * @param string $appName
+	 * @param IRequest $request
+	 * @param IAppData $appData
+	 * @param ITimeFactory $timeFactory
+	 */
+	public function __construct($appName, IRequest $request, IAppData $appData, ITimeFactory $timeFactory) {
+		parent::__construct($appName, $request);
+
+		$this->appData = $appData;
+		$this->timeFactory = $timeFactory;
+	}
+
+	/**
+	 * @PublicPage
+	 * @NoCSRFRequired
+	 *
+	 * @param string $fileName css filename with extension
+	 * @param string $appName css folder name
+	 * @return FileDisplayResponse|NotFoundResponse
+	 */
+	public function getJs($fileName, $appName) {
+		try {
+			$folder = $this->appData->getFolder($appName);
+			$jsFile = $folder->getFile($fileName);
+		} catch(NotFoundException $e) {
+			return new NotFoundResponse();
+		}
+
+		$response = new FileDisplayResponse($jsFile, Http::STATUS_OK, ['Content-Type' => 'application/javascript']);
+		$response->cacheFor(86400);
+		$expires = new \DateTime();
+		$expires->setTimestamp($this->timeFactory->getTime());
+		$expires->add(new \DateInterval('PT24H'));
+		$response->addHeader('Expires', $expires->format(\DateTime::RFC1123));
+		$response->addHeader('Pragma', 'cache');
+		return $response;
+	}
+}

core/routes.php

@@ -56,6 +56,7 @@ $application->registerRoutes($this, [
 		['name' => 'Preview#getPreview', 'url' => '/core/preview', 'verb' => 'GET'],
 		['name' => 'Preview#getPreview', 'url' => '/core/preview.png', 'verb' => 'GET'],
 		['name' => 'Css#getCss', 'url' => '/css/{appName}/{fileName}', 'verb' => 'GET'],
+		['name' => 'Js#getJs', 'url' => '/js/{appName}/{fileName}', 'verb' => 'GET'],
 	],
 	'ocs' => [
 		['root' => '/cloud', 'name' => 'OCS#getCapabilities', 'url' => '/capabilities', 'verb' => 'GET'],

lib/composer/composer/autoload_classmap.php

@@ -439,6 +439,7 @@ return array(
     'OC\\Core\\Command\\User\\Setting' => $baseDir . '/core/Command/User/Setting.php',
     'OC\\Core\\Controller\\AvatarController' => $baseDir . '/core/Controller/AvatarController.php',
     'OC\\Core\\Controller\\CssController' => $baseDir . '/core/Controller/CssController.php',
+    'OC\\Core\\Controller\\JsController' => $baseDir . '/core/Controller/JsController.php',
     'OC\\Core\\Controller\\LoginController' => $baseDir . '/core/Controller/LoginController.php',
     'OC\\Core\\Controller\\LostController' => $baseDir . '/core/Controller/LostController.php',
     'OC\\Core\\Controller\\OCJSController' => $baseDir . '/core/Controller/OCJSController.php',
@@ -802,6 +803,7 @@ return array(
     'OC\\TemplateLayout' => $baseDir . '/lib/private/TemplateLayout.php',
     'OC\\Template\\Base' => $baseDir . '/lib/private/Template/Base.php',
     'OC\\Template\\CSSResourceLocator' => $baseDir . '/lib/private/Template/CSSResourceLocator.php',
+    'OC\\Template\\JSCombiner' => $baseDir . '/lib/private/Template/JSCombiner.php',
     'OC\\Template\\JSConfigHelper' => $baseDir . '/lib/private/Template/JSConfigHelper.php',
     'OC\\Template\\JSResourceLocator' => $baseDir . '/lib/private/Template/JSResourceLocator.php',
     'OC\\Template\\ResourceLocator' => $baseDir . '/lib/private/Template/ResourceLocator.php',

lib/composer/composer/autoload_static.php

@@ -469,6 +469,7 @@ class ComposerStaticInit53792487c5a8370acc0b06b1a864ff4c
         'OC\\Core\\Command\\User\\Setting' => __DIR__ . '/../../..' . '/core/Command/User/Setting.php',
         'OC\\Core\\Controller\\AvatarController' => __DIR__ . '/../../..' . '/core/Controller/AvatarController.php',
         'OC\\Core\\Controller\\CssController' => __DIR__ . '/../../..' . '/core/Controller/CssController.php',
+        'OC\\Core\\Controller\\JsController' => __DIR__ . '/../../..' . '/core/Controller/JsController.php',
         'OC\\Core\\Controller\\LoginController' => __DIR__ . '/../../..' . '/core/Controller/LoginController.php',
         'OC\\Core\\Controller\\LostController' => __DIR__ . '/../../..' . '/core/Controller/LostController.php',
         'OC\\Core\\Controller\\OCJSController' => __DIR__ . '/../../..' . '/core/Controller/OCJSController.php',
@@ -832,6 +833,7 @@ class ComposerStaticInit53792487c5a8370acc0b06b1a864ff4c
         'OC\\TemplateLayout' => __DIR__ . '/../../..' . '/lib/private/TemplateLayout.php',
         'OC\\Template\\Base' => __DIR__ . '/../../..' . '/lib/private/Template/Base.php',
         'OC\\Template\\CSSResourceLocator' => __DIR__ . '/../../..' . '/lib/private/Template/CSSResourceLocator.php',
+        'OC\\Template\\JSCombiner' => __DIR__ . '/../../..' . '/lib/private/Template/JSCombiner.php',
         'OC\\Template\\JSConfigHelper' => __DIR__ . '/../../..' . '/lib/private/Template/JSConfigHelper.php',
         'OC\\Template\\JSResourceLocator' => __DIR__ . '/../../..' . '/lib/private/Template/JSResourceLocator.php',
         'OC\\Template\\ResourceLocator' => __DIR__ . '/../../..' . '/lib/private/Template/ResourceLocator.php',

lib/private/Template/JSCombiner.php

@@ -0,0 +1,199 @@
+<?php
+/**
+ * @copyright 2017, Roeland Jago Douma <roeland@famdouma.nl>
+ *
+ * @author Roeland Jago Douma <roeland@famdouma.nl>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+namespace OC\Template;
+
+use OC\SystemConfig;
+use OCP\ICache;
+use OCP\Files\IAppData;
+use OCP\Files\NotFoundException;
+use OCP\Files\NotPermittedException;
+use OCP\Files\SimpleFS\ISimpleFolder;
+use OCP\IURLGenerator;
+
+class JSCombiner {
+
+	/** @var IAppData */
+	protected $appData;
+
+	/** @var IURLGenerator */
+	protected $urlGenerator;
+
+	/** @var ICache */
+	protected $depsCache;
+
+	/** @var SystemConfig */
+	protected $config;
+
+	/**
+	 * JSCombiner constructor.
+	 *
+	 * @param IAppData $appData
+	 * @param IURLGenerator $urlGenerator
+	 * @param ICache $depsCache
+	 */
+	public function __construct(IAppData $appData,
+								IURLGenerator $urlGenerator,
+								ICache $depsCache,
+								SystemConfig $config) {
+		$this->appData = $appData;
+		$this->urlGenerator = $urlGenerator;
+		$this->depsCache = $depsCache;
+		$this->config = $config;
+	}
+
+	/**
+	 * @param string $root
+	 * @param string $file
+	 * @param string $app
+	 * @return bool
+	 */
+	public function process($root, $file, $app) {
+		if ($this->config->getValue('debug')) {
+			return false;
+		}
+
+		$path = explode('/', $root . '/' . $file);
+
+		$fileName = array_pop($path);
+		$path = implode('/', $path);
+
+		try {
+			$folder = $this->appData->getFolder($app);
+		} catch(NotFoundException $e) {
+			// creating css appdata folder
+			$folder = $this->appData->newFolder($app);
+		}
+
+		if($this->isCached($fileName, $folder)) {
+			return true;
+		}
+		return $this->cache($path, $fileName, $folder);
+	}
+
+	/**
+	 * @param string $fileName
+	 * @param ISimpleFolder $folder
+	 * @return bool
+	 */
+	protected function isCached($fileName, ISimpleFolder $folder) {
+		$fileName = str_replace('.json', '.js', $fileName) . '.deps';
+		try {
+			$deps = $this->depsCache->get($folder->getName() . '-' . $fileName);
+			if ($deps === null) {
+				$depFile = $folder->getFile($fileName);
+				$deps = $depFile->getContent();
+				$this->depsCache->set($folder->getName() . '-' . $fileName, $deps);
+			}
+			$deps = json_decode($deps, true);
+
+			foreach ($deps as $file=>$mtime) {
+				if (!file_exists($file) || filemtime($file) > $mtime) {
+					return false;
+				}
+			}
+
+			return true;
+		} catch(NotFoundException $e) {
+			return false;
+		}
+	}
+
+	/**
+	 * @param string $path
+	 * @param string $fileName
+	 * @param ISimpleFolder $folder
+	 * @return bool
+	 */
+	protected function cache($path, $fileName, ISimpleFolder $folder) {
+		$deps = [];
+		$fullPath = $path . '/' . $fileName;
+		$data = json_decode(file_get_contents($fullPath));
+		$deps[$fullPath] = filemtime($fullPath);
+
+		$res = '';
+		foreach ($data as $file) {
+			$filePath = $path . '/' . $file;
+
+			if (is_file($filePath)) {
+				$res .= file_get_contents($filePath);
+				$res .= PHP_EOL . PHP_EOL;
+				$deps[$filePath] = filemtime($filePath);
+			}
+		}
+
+		$fileName = str_replace('.json', '.js', $fileName);
+		try {
+			$cachedfile = $folder->getFile($fileName);
+		} catch(NotFoundException $e) {
+			$cachedfile = $folder->newFile($fileName);
+		}
+
+		$depFileName = $fileName . '.deps';
+		try {
+			$depFile = $folder->getFile($depFileName);
+		} catch (NotFoundException $e) {
+			$depFile = $folder->newFile($depFileName);
+		}
+
+		try {
+			$cachedfile->putContent($res);
+			$depFile->putContent(json_encode($deps));
+			return true;
+		} catch (NotPermittedException $e) {
+			return false;
+		}
+	}
+
+	/**
+	 * @param string $appName
+	 * @param string $fileName
+	 * @return string
+	 */
+	public function getCachedJS($appName, $fileName) {
+		$tmpfileLoc = explode('/', $fileName);
+		$fileName = array_pop($tmpfileLoc);
+		$fileName = str_replace('.json', '.js', $fileName);
+
+		return substr($this->urlGenerator->linkToRoute('core.Js.getJs', array('fileName' => $fileName, 'appName' => $appName)), strlen(\OC::$WEBROOT) + 1);
+	}
+
+	/**
+	 * @param string $root
+	 * @param string $file
+	 * @return string[]
+	 */
+	public function getContent($root, $file) {
+		$data = json_decode(file_get_contents($root . '/' . $file));
+
+		$path = explode('/', $file);
+		array_pop($path);
+		$path = implode('/', $path);
+
+		$result = [];
+		foreach ($data as $f) {
+			$result[] = $path . '/' . $f;
+		}
+
+		return $result;
+	}
+}

lib/private/Template/JSResourceLocator.php

@@ -26,6 +26,16 @@
 namespace OC\Template;
 
 class JSResourceLocator extends ResourceLocator {
+
+	/** @var JSCombiner */
+	protected $jsCombiner;
+
+	public function __construct(\OCP\ILogger $logger, $theme, array $core_map, array $party_map, JSCombiner $JSCombiner) {
+		parent::__construct($logger, $theme, $core_map, $party_map);
+
+		$this->jsCombiner = $JSCombiner;
+	}
+
 	/**
 	 * @param string $script
 	 */
@@ -52,8 +62,10 @@ class JSResourceLocator extends ResourceLocator {
 		} else if ($this->appendIfExist($this->serverroot, $theme_dir.'apps/'.$script.'.js')
 			|| $this->appendIfExist($this->serverroot, $theme_dir.$script.'.js')
 			|| $this->appendIfExist($this->serverroot, $script.'.js')
+			|| $this->cacheAndAppendCombineJsonIfExist($this->serverroot, $script.'.json')
 			|| $this->appendIfExist($this->serverroot, $theme_dir.'core/'.$script.'.js')
 			|| $this->appendIfExist($this->serverroot, 'core/'.$script.'.js')
+			|| $this->cacheAndAppendCombineJsonIfExist($this->serverroot, 'core/'.$script.'.json')
 		) {
 			return;
 		}
@@ -68,7 +80,9 @@ class JSResourceLocator extends ResourceLocator {
 			$this->appendIfExist($app_path, $script . '.js', $app_url);
 			return;
 		}
-		$this->append($app_path, $script . '.js', $app_url);
+		if (!$this->cacheAndAppendCombineJsonIfExist($app_path, $script.'.json', $app)) {
+			$this->append($app_path, $script . '.js', $app_url);
+		}
 	}
 
 	/**
@@ -76,4 +90,23 @@ class JSResourceLocator extends ResourceLocator {
 	 */
 	public function doFindTheme($script) {
 	}
+
+	protected function cacheAndAppendCombineJsonIfExist($root, $file, $app = 'core') {
+		if (is_file($root.'/'.$file)) {
+			if ($this->jsCombiner->process($root, $file, $app)) {
+				$this->append($this->serverroot, $this->jsCombiner->getCachedJS($app, $file), false, false);
+			} else {
+				// Add all the files from the json
+				$files = $this->jsCombiner->getContent($root, $file);
+				$app_url = \OC_App::getAppWebPath($app);
+
+				foreach ($files as $jsFile) {
+					$this->append($root, $jsFile, $app_url);
+				}
+			}
+			return true;
+		}
+
+		return false;
+	}
 }

lib/private/TemplateLayout.php

@@ -35,6 +35,7 @@
  */
 namespace OC;
 
+use OC\Template\JSCombiner;
 use OC\Template\JSConfigHelper;
 use OC\Template\SCSSCacher;
 
@@ -249,7 +250,14 @@ class TemplateLayout extends \OC_Template {
 			\OC::$server->getLogger(),
 			$theme,
 			array( \OC::$SERVERROOT => \OC::$WEBROOT ),
-			array( \OC::$SERVERROOT => \OC::$WEBROOT ));
+			array( \OC::$SERVERROOT => \OC::$WEBROOT ),
+			new JSCombiner(
+				\OC::$server->getAppDataDir('js'),
+				\OC::$server->getURLGenerator(),
+				\OC::$server->getMemCacheFactory()->create('JS'),
+				\OC::$server->getSystemConfig()
+			)
+			);
 		$locator->find($scripts);
 		return $locator->getResources();
 	}

tests/Core/Controller/JsControllerTest.php

@@ -0,0 +1,110 @@
+<?php
+/**
+ * @copyright 2017, Roeland Jago Douma <roeland@famdouma.nl>
+ *
+ * @author Roeland Jago Douma <roeland@famdouma.nl>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+namespace Tests\Core\Controller;
+
+use OC\Core\Controller\JsController;
+use OCP\AppFramework\Http;
+use OCP\AppFramework\Http\FileDisplayResponse;
+use OCP\AppFramework\Http\NotFoundResponse;
+use OCP\AppFramework\Utility\ITimeFactory;
+use OCP\Files\IAppData;
+use OCP\Files\NotFoundException;
+use OCP\Files\SimpleFS\ISimpleFile;
+use OCP\Files\SimpleFS\ISimpleFolder;
+use OCP\IRequest;
+use Test\TestCase;
+
+class JsControllerTest extends TestCase {
+
+	/** @var IAppData|\PHPUnit_Framework_MockObject_MockObject */
+	private $appData;
+
+	/** @var JsController */
+	private $controller;
+
+	public function setUp() {
+		parent::setUp();
+
+		$this->appData = $this->createMock(IAppData::class);
+
+		$timeFactory = $this->createMock(ITimeFactory::class);
+		$timeFactory->method('getTime')
+			->willReturn(1337);
+
+		$this->controller = new JsController(
+			'core',
+			$this->createMock(IRequest::class),
+			$this->appData,
+			$timeFactory
+		);
+	}
+
+	public function testNoCssFolderForApp() {
+		$this->appData->method('getFolder')
+			->with('myapp')
+			->willThrowException(new NotFoundException());
+
+		$result = $this->controller->getJs('file.css', 'myapp');
+
+		$this->assertInstanceOf(NotFoundResponse::class, $result);
+	}
+
+
+	public function testNoCssFile() {
+		$folder = $this->createMock(ISimpleFolder::class);
+		$this->appData->method('getFolder')
+			->with('myapp')
+			->willReturn($folder);
+
+		$folder->method('getFile')
+			->willThrowException(new NotFoundException());
+
+		$result = $this->controller->getJs('file.css', 'myapp');
+
+		$this->assertInstanceOf(NotFoundResponse::class, $result);
+	}
+
+	public function testGetFile() {
+		$folder = $this->createMock(ISimpleFolder::class);
+		$file = $this->createMock(ISimpleFile::class);
+		$this->appData->method('getFolder')
+			->with('myapp')
+			->willReturn($folder);
+
+		$folder->method('getFile')
+			->with('file.js')
+			->willReturn($file);
+
+		$expected = new FileDisplayResponse($file, Http::STATUS_OK, ['Content-Type' => 'application/javascript']);
+		$expected->cacheFor(86400);
+		$expires = new \DateTime();
+		$expires->setTimestamp(1337);
+		$expires->add(new \DateInterval('PT24H'));
+		$expected->addHeader('Expires', $expires->format(\DateTime::RFC1123));
+		$expected->addHeader('Pragma', 'cache');
+
+		$result = $this->controller->getJs('file.js', 'myapp');
+		$this->assertEquals($expected, $result);
+	}
+
+}

tests/lib/Template/JSCombinerTest.php

@@ -0,0 +1,268 @@
+<?php
+
+namespace Test\Template;
+
+use OC\SystemConfig;
+use OC\Template\JSCombiner;
+use OC\Template\SCSSCacher;
+use OCP\Files\IAppData;
+use OCP\Files\NotFoundException;
+use OCP\Files\SimpleFS\ISimpleFile;
+use OCP\Files\SimpleFS\ISimpleFolder;
+use OCP\ICache;
+use OCP\IConfig;
+use OCP\ILogger;
+use OCP\IURLGenerator;
+
+class JSCombinerTest extends \Test\TestCase {
+	/** @var IAppData|\PHPUnit_Framework_MockObject_MockObject */
+	protected $appData;
+	/** @var IURLGenerator|\PHPUnit_Framework_MockObject_MockObject */
+	protected $urlGenerator;
+	/** @var IConfig|\PHPUnit_Framework_MockObject_MockObject */
+	protected $config;
+	/** @var JSCombiner */
+	protected $jsCombiner;
+	/** @var ICache|\PHPUnit_Framework_MockObject_MockObject */
+	protected $depsCache;
+
+	protected function setUp() {
+		parent::setUp();
+
+		$this->appData = $this->createMock(IAppData::class);
+		$this->urlGenerator = $this->createMock(IURLGenerator::class);
+		$this->config = $this->createMock(SystemConfig::class);
+		$this->depsCache = $this->createMock(ICache::class);
+		$this->jsCombiner = new JSCombiner(
+			$this->appData,
+			$this->urlGenerator,
+			$this->depsCache,
+			$this->config);
+	}
+
+	public function testProcessUncachedFileNoAppDataFolder() {
+		$folder = $this->createMock(ISimpleFolder::class);
+		$this->appData->expects($this->once())->method('getFolder')->with('awesomeapp')->willThrowException(new NotFoundException());
+		$this->appData->expects($this->once())->method('newFolder')->with('awesomeapp')->willReturn($folder);
+		$file = $this->createMock(ISimpleFile::class);
+
+		$fileDeps = $this->createMock(ISimpleFile::class);
+
+		$folder->method('getFile')
+			->will($this->returnCallback(function($path) use ($file) {
+				if ($path === 'combine.js') {
+					return $file;
+				} else if ($path === 'combine.js.deps') {
+					throw new NotFoundException();
+				} else {
+					$this->fail();
+				}
+			}));
+		$folder->expects($this->once())
+			->method('newFile')
+			->with('combine.js.deps')
+			->willReturn($fileDeps);
+
+		$actual = $this->jsCombiner->process(__DIR__, '/data/combine.json', 'awesomeapp');
+		$this->assertTrue($actual);
+	}
+
+	public function testProcessUncachedFile() {
+		$folder = $this->createMock(ISimpleFolder::class);
+		$this->appData->expects($this->once())->method('getFolder')->with('awesomeapp')->willReturn($folder);
+		$file = $this->createMock(ISimpleFile::class);
+
+		$fileDeps = $this->createMock(ISimpleFile::class);
+
+		$folder->method('getFile')
+			->will($this->returnCallback(function($path) use ($file) {
+				if ($path === 'combine.js') {
+					return $file;
+				} else if ($path === 'combine.js.deps') {
+					throw new NotFoundException();
+				} else {
+					$this->fail();
+				}
+			}));
+		$folder->expects($this->once())
+			->method('newFile')
+			->with('combine.js.deps')
+			->willReturn($fileDeps);
+
+		$actual = $this->jsCombiner->process(__DIR__, '/data/combine.json', 'awesomeapp');
+		$this->assertTrue($actual);
+	}
+
+	public function testProcessCachedFile() {
+		$folder = $this->createMock(ISimpleFolder::class);
+		$this->appData->expects($this->once())->method('getFolder')->with('awesomeapp')->willReturn($folder);
+		$file = $this->createMock(ISimpleFile::class);
+
+		$fileDeps = $this->createMock(ISimpleFile::class);
+
+		$fileDeps->expects($this->once())->method('getContent')->willReturn('{}');
+
+		$folder->method('getFile')
+			->will($this->returnCallback(function($path) use ($file, $fileDeps) {
+				if ($path === 'combine.js') {
+					return $file;
+				} else if ($path === 'combine.js.deps') {
+					return $fileDeps;
+				} else {
+					$this->fail();
+				}
+			}));
+
+		$actual = $this->jsCombiner->process(__DIR__, '/data/combine.json', 'awesomeapp');
+		$this->assertTrue($actual);
+	}
+
+	public function testProcessCachedFileMemcache() {
+		$folder = $this->createMock(ISimpleFolder::class);
+		$this->appData->expects($this->once())
+			->method('getFolder')
+			->with('awesomeapp')
+			->willReturn($folder);
+		$folder->method('getName')
+			->willReturn('awesomeapp');
+
+		$file = $this->createMock(ISimpleFile::class);
+
+		$this->depsCache->method('get')
+			->with('awesomeapp-combine.js.deps')
+			->willReturn('{}');
+
+		$folder->method('getFile')
+			->will($this->returnCallback(function($path) use ($file) {
+				if ($path === 'combine.js') {
+					return $file;
+				} else if ($path === 'combine.js.deps') {
+					$this->fail();
+				} else {
+					$this->fail();
+				}
+			}));
+
+		$actual = $this->jsCombiner->process(__DIR__, '/data/combine.json', 'awesomeapp');
+		$this->assertTrue($actual);
+	}
+
+	public function testIsCachedNoDepsFile() {
+		$fileName = "combine.json";
+		$folder = $this->createMock(ISimpleFolder::class);
+		$file = $this->createMock(ISimpleFile::class);
+
+		$folder->method('getFile')
+			->will($this->returnCallback(function($path) use ($file) {
+				if ($path === 'combine.js') {
+					return $file;
+				} else if ($path === 'combine.js.deps') {
+					throw new NotFoundException();
+				} else {
+					$this->fail();
+				}
+			}));
+
+		$actual = self::invokePrivate($this->jsCombiner, 'isCached', [$fileName, $folder]);
+		$this->assertFalse($actual);
+	}
+	public function testCacheNoFile() {
+		$fileName = "combine.js";
+
+		$folder = $this->createMock(ISimpleFolder::class);
+		$file = $this->createMock(ISimpleFile::class);
+		$depsFile = $this->createMock(ISimpleFile::class);
+
+		$path = __DIR__ . '/data/';
+
+		$folder->expects($this->at(0))->method('getFile')->with($fileName)->willThrowException(new NotFoundException());
+		$folder->expects($this->at(1))->method('newFile')->with($fileName)->willReturn($file);
+		$folder->expects($this->at(2))->method('getFile')->with($fileName . '.deps')->willThrowException(new NotFoundException());
+		$folder->expects($this->at(3))->method('newFile')->with($fileName . '.deps')->willReturn($depsFile);
+
+		$file->expects($this->once())->method('putContent');
+		$depsFile->expects($this->once())->method('putContent');
+
+		$actual = self::invokePrivate($this->jsCombiner, 'cache', [$path, 'combine.json', $folder]);
+		$this->assertTrue($actual);
+	}
+
+	public function testCache() {
+		$fileName = "combine.js";
+
+		$folder = $this->createMock(ISimpleFolder::class);
+		$file = $this->createMock(ISimpleFile::class);
+		$depsFile = $this->createMock(ISimpleFile::class);
+
+		$path = __DIR__ . '/data/';
+
+		$folder->expects($this->at(0))->method('getFile')->with($fileName)->willReturn($file);
+		$folder->expects($this->at(1))->method('getFile')->with($fileName . '.deps')->willReturn($depsFile);
+
+		$file->expects($this->once())->method('putContent');
+		$depsFile->expects($this->once())->method('putContent');
+
+		$actual = self::invokePrivate($this->jsCombiner, 'cache', [$path, 'combine.json', $folder]);
+		$this->assertTrue($actual);
+	}
+
+	public function testCacheSuccess() {
+		$fileName = 'combine.js';
+
+		$folder = $this->createMock(ISimpleFolder::class);
+		$file = $this->createMock(ISimpleFile::class);
+		$depsFile = $this->createMock(ISimpleFile::class);
+
+		$path = __DIR__ . '/data/';
+
+		$folder->expects($this->at(0))->method('getFile')->with($fileName)->willReturn($file);
+		$folder->expects($this->at(1))->method('getFile')->with($fileName . '.deps')->willReturn($depsFile);
+
+		$file->expects($this->at(0))
+			->method('putContent')
+			->with('var a = \'hello\';
+
+
+var b = \'world\';
+
+
+');
+		$depsFile->expects($this->at(0))->method('putContent')->with($this->callback(
+			function ($content) {
+				$deps = json_decode($content, true);
+				return array_key_exists(__DIR__ . '/data//1.js', $deps)
+					&& array_key_exists(__DIR__ . '/data//2.js', $deps);
+			}));
+
+		$actual = self::invokePrivate($this->jsCombiner, 'cache', [$path, 'combine.json', $folder]);
+		$this->assertTrue($actual);
+	}
+
+	public function dataGetCachedSCSS() {
+		return [
+			['awesomeapp', 'core/js/foo.json', '/js/core/foo.js'],
+			['files', 'apps/files/js/foo.json', '/js/files/foo.js']
+		];
+	}
+
+	/**
+	 * @param $appName
+	 * @param $fileName
+	 * @param $result
+	 * @dataProvider dataGetCachedSCSS
+	 */
+	public function testGetCachedSCSS($appName, $fileName, $result) {
+		$this->urlGenerator->expects($this->once())
+			->method('linkToRoute')
+			->with('core.Js.getJs', [
+				'fileName' => 'foo.js',
+				'appName' => $appName
+			])
+			->willReturn(\OC::$WEBROOT . $result);
+
+		$actual = $this->jsCombiner->getCachedJS($appName, $fileName);
+		$this->assertEquals(substr($result, 1), $actual);
+	}
+
+
+}

tests/lib/Template/data/1.js

@@ -0,0 +1 @@
+var a = 'hello';

tests/lib/Template/data/2.js

@@ -0,0 +1 @@
+var b = 'world';

tests/lib/Template/data/combine.json

@@ -0,0 +1,4 @@
+[
+  "1.js",
+  "2.js"
+]