nextcloud / server

config/config.sample.php

Indentation +136 added lines, -136 removed lines

@@ -41,17 +41,17 @@ 
  */
 'instanceid' => '',
 
- /**
-  * The salt used to hash all passwords, auto-generated by the Nextcloud
-  * installer. (There are also per-user salts.) If you lose this salt you lose
-  * all your passwords. This example is for documentation only, and you should
-  * never use it.
-  *
-  * @deprecated This salt is deprecated and only used for legacy-compatibility,
-  * developers should *NOT* use this value for anything nowadays.
-  *
-  * 'passwordsalt' => 'd3c944a9af095aa08f',
- */
+    /**
+     * The salt used to hash all passwords, auto-generated by the Nextcloud
+     * installer. (There are also per-user salts.) If you lose this salt you lose
+     * all your passwords. This example is for documentation only, and you should
+     * never use it.
+     *
+     * @deprecated This salt is deprecated and only used for legacy-compatibility,
+     * developers should *NOT* use this value for anything nowadays.
+     *
+     * 'passwordsalt' => 'd3c944a9af095aa08f',
+     */
 'passwordsalt' => '',
 
 /**
@@ -69,12 +69,12 @@ 
  *   Using TLS certificates where commonName=<IP address> is deprecated
  */
 'trusted_domains' =>
-   [
+    [
     'demo.example.org',
     'otherdomain.example.org',
     '10.111.112.113',
     '[2001:db8::1]'
-  ],
+    ],
 
 
 /**
@@ -767,10 +767,10 @@ 
  *  - www.edri.org
  */
 'connectivity_check_domains' => [
-	'www.nextcloud.com',
-	'www.startpage.com',
-	'www.eff.org',
-	'www.edri.org'
+    'www.nextcloud.com',
+    'www.startpage.com',
+    'www.eff.org',
+    'www.edri.org'
 ],
 
 /**
@@ -886,9 +886,9 @@ 
  * Defaults to an empty array.
  */
 'log.condition' => [
-	'shared_secret' => '57b58edb6637fe3059b3595cf9c41b9',
-	'users' => ['sample-user'],
-	'apps' => ['files'],
+    'shared_secret' => '57b58edb6637fe3059b3595cf9c41b9',
+    'users' => ['sample-user'],
+    'apps' => ['files'],
 ],
 
 /**
@@ -942,18 +942,18 @@ 
  *  - iOS client app id: ``1125420102``
  */
 'customclient_desktop' =>
-	'https://nextcloud.com/install/#install-clients',
+    'https://nextcloud.com/install/#install-clients',
 'customclient_android' =>
-	'https://play.google.com/store/apps/details?id=com.nextcloud.client',
+    'https://play.google.com/store/apps/details?id=com.nextcloud.client',
 'customclient_ios' =>
-	'https://itunes.apple.com/us/app/nextcloud/id1125420102?mt=8',
+    'https://itunes.apple.com/us/app/nextcloud/id1125420102?mt=8',
 'customclient_ios_appid' =>
-		'1125420102',
+        '1125420102',
 /**
- * Apps
- *
- * Options for the Apps folder, Apps store, and App code checker.
- */
+         * Apps
+         *
+         * Options for the Apps folder, Apps store, and App code checker.
+         */
 
 /**
  * When enabled, admins may install apps from the Nextcloud app store.
@@ -979,11 +979,11 @@ 
  * indicates if a Web server can write files to that folder.
  */
 'apps_paths' => [
-	[
-		'path'=> '/var/www/nextcloud/apps',
-		'url' => '/apps',
-		'writable' => true,
-	],
+    [
+        'path'=> '/var/www/nextcloud/apps',
+        'url' => '/apps',
+        'writable' => true,
+    ],
 ],
 
 /**
@@ -1048,8 +1048,8 @@ 
  * Defaults to ``''`` (empty string)
  */
 'preview_office_cl_parameters' =>
-	' --headless --nologo --nofirststartwizard --invisible --norestore '.
-	'--convert-to png --outdir ',
+    ' --headless --nologo --nofirststartwizard --invisible --norestore '.
+    '--convert-to png --outdir ',
 
 /**
  * Only register providers that have been explicitly enabled
@@ -1086,16 +1086,16 @@ 
  *  - OC\Preview\Krita
  */
 'enabledPreviewProviders' => [
-	'OC\Preview\PNG',
-	'OC\Preview\JPEG',
-	'OC\Preview\GIF',
-	'OC\Preview\BMP',
-	'OC\Preview\XBitmap',
-	'OC\Preview\MP3',
-	'OC\Preview\TXT',
-	'OC\Preview\MarkDown',
-	'OC\Preview\OpenDocument',
-	'OC\Preview\Krita',
+    'OC\Preview\PNG',
+    'OC\Preview\JPEG',
+    'OC\Preview\GIF',
+    'OC\Preview\BMP',
+    'OC\Preview\XBitmap',
+    'OC\Preview\MP3',
+    'OC\Preview\TXT',
+    'OC\Preview\MarkDown',
+    'OC\Preview\OpenDocument',
+    'OC\Preview\Krita',
 ],
 
 /**
@@ -1171,11 +1171,11 @@ 
 
 /**
  * Extra SSL options to be used for configuration.
-  *
+ *
  * Defaults to an empty array.
  */
 'openssl' => [
-	'config' => '/absolute/location/of/openssl.cnf',
+    'config' => '/absolute/location/of/openssl.cnf',
 ],
 
 /**
@@ -1223,11 +1223,11 @@ 
  * for more information.
  */
 'redis' => [
-	'host' => 'localhost', // can also be a unix domain socket: '/tmp/redis.sock'
-	'port' => 6379,
-	'timeout' => 0.0,
-	'password' => '', // Optional, if not defined no password will be used.
-	'dbindex' => 0, // Optional, if undefined SELECT will not run and will use Redis Server's default DB Index.
+    'host' => 'localhost', // can also be a unix domain socket: '/tmp/redis.sock'
+    'port' => 6379,
+    'timeout' => 0.0,
+    'password' => '', // Optional, if not defined no password will be used.
+    'dbindex' => 0, // Optional, if undefined SELECT will not run and will use Redis Server's default DB Index.
 ],
 
 /**
@@ -1256,14 +1256,14 @@ 
  * https://github.com/phpredis/phpredis/commit/c5994f2a42b8a348af92d3acb4edff1328ad8ce1
  */
 'redis.cluster' => [
-	'seeds' => [ // provide some/all of the cluster servers to bootstrap discovery, port required
-		'localhost:7000',
-		'localhost:7001',
-	],
-	'timeout' => 0.0,
-	'read_timeout' => 0.0,
-	'failover_mode' => \RedisCluster::FAILOVER_ERROR,
-	'password' => '', // Optional, if not defined no password will be used.
+    'seeds' => [ // provide some/all of the cluster servers to bootstrap discovery, port required
+        'localhost:7000',
+        'localhost:7001',
+    ],
+    'timeout' => 0.0,
+    'read_timeout' => 0.0,
+    'failover_mode' => \RedisCluster::FAILOVER_ERROR,
+    'password' => '', // Optional, if not defined no password will be used.
 ],
 
 
@@ -1271,35 +1271,35 @@ 
  * Server details for one or more memcached servers to use for memory caching.
  */
 'memcached_servers' => [
-	// hostname, port and optional weight. Also see:
-	// https://www.php.net/manual/en/memcached.addservers.php
-	// https://www.php.net/manual/en/memcached.addserver.php
-	['localhost', 11211],
-	//array('other.host.local', 11211),
+    // hostname, port and optional weight. Also see:
+    // https://www.php.net/manual/en/memcached.addservers.php
+    // https://www.php.net/manual/en/memcached.addserver.php
+    ['localhost', 11211],
+    //array('other.host.local', 11211),
 ],
 
 /**
  * Connection options for memcached
  */
 'memcached_options' => [
-	// Set timeouts to 50ms
-	\Memcached::OPT_CONNECT_TIMEOUT => 50,
-	\Memcached::OPT_RETRY_TIMEOUT =>   50,
-	\Memcached::OPT_SEND_TIMEOUT =>    50,
-	\Memcached::OPT_RECV_TIMEOUT =>    50,
-	\Memcached::OPT_POLL_TIMEOUT =>    50,
+    // Set timeouts to 50ms
+    \Memcached::OPT_CONNECT_TIMEOUT => 50,
+    \Memcached::OPT_RETRY_TIMEOUT =>   50,
+    \Memcached::OPT_SEND_TIMEOUT =>    50,
+    \Memcached::OPT_RECV_TIMEOUT =>    50,
+    \Memcached::OPT_POLL_TIMEOUT =>    50,
 
-	// Enable compression
-	\Memcached::OPT_COMPRESSION =>          true,
+    // Enable compression
+    \Memcached::OPT_COMPRESSION =>          true,
 
-	// Turn on consistent hashing
-	\Memcached::OPT_LIBKETAMA_COMPATIBLE => true,
+    // Turn on consistent hashing
+    \Memcached::OPT_LIBKETAMA_COMPATIBLE => true,
 
-	// Enable Binary Protocol
-	\Memcached::OPT_BINARY_PROTOCOL =>      true,
+    // Enable Binary Protocol
+    \Memcached::OPT_BINARY_PROTOCOL =>      true,
 
-	// Binary serializer vill be enabled if the igbinary PECL module is available
-	//\Memcached::OPT_SERIALIZER => \Memcached::SERIALIZER_IGBINARY,
+    // Binary serializer vill be enabled if the igbinary PECL module is available
+    //\Memcached::OPT_SERIALIZER => \Memcached::SERIALIZER_IGBINARY,
 ],
 
 
@@ -1345,61 +1345,61 @@ 
  * One way to test is applying for a trystack account at http://trystack.org/
  */
 'objectstore' => [
-	'class' => 'OC\\Files\\ObjectStore\\Swift',
-	'arguments' => [
-		// trystack will use your facebook id as the user name
-		'username' => 'facebook100000123456789',
-		// in the trystack dashboard go to user -> settings -> API Password to
-		// generate a password
-		'password' => 'Secr3tPaSSWoRdt7',
-		// must already exist in the objectstore, name can be different
-		'container' => 'nextcloud',
-		// prefix to prepend to the fileid, default is 'oid:urn:'
-		'objectPrefix' => 'oid:urn:',
-		// create the container if it does not exist. default is false
-		'autocreate' => true,
-		// required, dev-/trystack defaults to 'RegionOne'
-		'region' => 'RegionOne',
-		// The Identity / Keystone endpoint
-		'url' => 'http://8.21.28.222:5000/v2.0',
-		// required on dev-/trystack
-		'tenantName' => 'facebook100000123456789',
-		// dev-/trystack uses swift by default, the lib defaults to 'cloudFiles'
-		// if omitted
-		'serviceName' => 'swift',
-		// The Interface / url Type, optional
-		'urlType' => 'internal'
-	],
+    'class' => 'OC\\Files\\ObjectStore\\Swift',
+    'arguments' => [
+        // trystack will use your facebook id as the user name
+        'username' => 'facebook100000123456789',
+        // in the trystack dashboard go to user -> settings -> API Password to
+        // generate a password
+        'password' => 'Secr3tPaSSWoRdt7',
+        // must already exist in the objectstore, name can be different
+        'container' => 'nextcloud',
+        // prefix to prepend to the fileid, default is 'oid:urn:'
+        'objectPrefix' => 'oid:urn:',
+        // create the container if it does not exist. default is false
+        'autocreate' => true,
+        // required, dev-/trystack defaults to 'RegionOne'
+        'region' => 'RegionOne',
+        // The Identity / Keystone endpoint
+        'url' => 'http://8.21.28.222:5000/v2.0',
+        // required on dev-/trystack
+        'tenantName' => 'facebook100000123456789',
+        // dev-/trystack uses swift by default, the lib defaults to 'cloudFiles'
+        // if omitted
+        'serviceName' => 'swift',
+        // The Interface / url Type, optional
+        'urlType' => 'internal'
+    ],
 ],
 
 /**
  * To use swift V3
  */
 'objectstore' => [
-	'class' => 'OC\\Files\\ObjectStore\\Swift',
-	'arguments' => [
-		'autocreate' => true,
-		'user' => [
-			'name' => 'swift',
-			'password' => 'swift',
-			'domain' => [
-				'name' => 'default',
-			],
-		],
-		'scope' => [
-			'project' => [
-				'name' => 'service',
-				'domain' => [
-					'name' => 'default',
-				],
-			],
-		],
-		'tenantName' => 'service',
-		'serviceName' => 'swift',
-		'region' => 'regionOne',
-		'url' => 'http://yourswifthost:5000/v3',
-		'bucket' => 'nextcloud',
-	],
+    'class' => 'OC\\Files\\ObjectStore\\Swift',
+    'arguments' => [
+        'autocreate' => true,
+        'user' => [
+            'name' => 'swift',
+            'password' => 'swift',
+            'domain' => [
+                'name' => 'default',
+            ],
+        ],
+        'scope' => [
+            'project' => [
+                'name' => 'service',
+                'domain' => [
+                    'name' => 'default',
+                ],
+            ],
+        ],
+        'tenantName' => 'service',
+        'serviceName' => 'swift',
+        'region' => 'regionOne',
+        'url' => 'http://yourswifthost:5000/v3',
+        'bucket' => 'nextcloud',
+    ],
 ],
 
 /**
@@ -1480,8 +1480,8 @@ 
  * encryption in MySQL or specify a custom wait timeout on a cheap hoster.
  */
 'dbdriveroptions' => [
-	PDO::MYSQL_ATTR_SSL_CA => '/file/path/to/ca_cert.pem',
-	PDO::MYSQL_ATTR_INIT_COMMAND => 'SET wait_timeout = 28800'
+    PDO::MYSQL_ATTR_SSL_CA => '/file/path/to/ca_cert.pem',
+    PDO::MYSQL_ATTR_INIT_COMMAND => 'SET wait_timeout = 28800'
 ],
 
 /**
@@ -1538,10 +1538,10 @@ 
  *  - pgsql (PostgreSQL)
  */
 'supportedDatabases' => [
-	'sqlite',
-	'mysql',
-	'pgsql',
-	'oci',
+    'sqlite',
+    'mysql',
+    'pgsql',
+    'oci',
 ],
 
 /**
@@ -1882,8 +1882,8 @@ 
  * WARNING: only use this if you know what you are doing
  */
 'csrf.optout' => [
-	'/^WebDAVFS/', // OS X Finder
-	'/^Microsoft-WebDAV-MiniRedir/', // Windows webdav drive
+    '/^WebDAVFS/', // OS X Finder
+    '/^Microsoft-WebDAV-MiniRedir/', // Windows webdav drive
 ],
 
 /**

lib/private/PreviewManager.php

Indentation +388 added lines, -388 removed lines

@@ -43,392 +43,392 @@
 use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 
 class PreviewManager implements IPreview {
-	/** @var IConfig */
-	protected $config;
-
-	/** @var IRootFolder */
-	protected $rootFolder;
-
-	/** @var IAppData */
-	protected $appData;
-
-	/** @var EventDispatcherInterface */
-	protected $eventDispatcher;
-
-	/** @var Generator */
-	private $generator;
-
-	/** @var GeneratorHelper */
-	private $helper;
-
-	/** @var bool */
-	protected $providerListDirty = false;
-
-	/** @var bool */
-	protected $registeredCoreProviders = false;
-
-	/** @var array */
-	protected $providers = [];
-
-	/** @var array mime type => support status */
-	protected $mimeTypeSupportMap = [];
-
-	/** @var array */
-	protected $defaultProviders;
-
-	/** @var string */
-	protected $userId;
-
-	/**
-	 * PreviewManager constructor.
-	 *
-	 * @param IConfig $config
-	 * @param IRootFolder $rootFolder
-	 * @param IAppData $appData
-	 * @param EventDispatcherInterface $eventDispatcher
-	 * @param string $userId
-	 */
-	public function __construct(IConfig $config,
-								IRootFolder $rootFolder,
-								IAppData $appData,
-								EventDispatcherInterface $eventDispatcher,
-								GeneratorHelper $helper,
-								$userId) {
-		$this->config = $config;
-		$this->rootFolder = $rootFolder;
-		$this->appData = $appData;
-		$this->eventDispatcher = $eventDispatcher;
-		$this->helper = $helper;
-		$this->userId = $userId;
-	}
-
-	/**
-	 * In order to improve lazy loading a closure can be registered which will be
-	 * called in case preview providers are actually requested
-	 *
-	 * $callable has to return an instance of \OCP\Preview\IProvider or \OCP\Preview\IProviderV2
-	 *
-	 * @param string $mimeTypeRegex Regex with the mime types that are supported by this provider
-	 * @param \Closure $callable
-	 * @return void
-	 */
-	public function registerProvider($mimeTypeRegex, \Closure $callable) {
-		if (!$this->config->getSystemValue('enable_previews', true)) {
-			return;
-		}
-
-		if (!isset($this->providers[$mimeTypeRegex])) {
-			$this->providers[$mimeTypeRegex] = [];
-		}
-		$this->providers[$mimeTypeRegex][] = $callable;
-		$this->providerListDirty = true;
-	}
-
-	/**
-	 * Get all providers
-	 * @return array
-	 */
-	public function getProviders() {
-		if (!$this->config->getSystemValue('enable_previews', true)) {
-			return [];
-		}
-
-		$this->registerCoreProviders();
-		if ($this->providerListDirty) {
-			$keys = array_map('strlen', array_keys($this->providers));
-			array_multisort($keys, SORT_DESC, $this->providers);
-			$this->providerListDirty = false;
-		}
-
-		return $this->providers;
-	}
-
-	/**
-	 * Does the manager have any providers
-	 * @return bool
-	 */
-	public function hasProviders() {
-		$this->registerCoreProviders();
-		return !empty($this->providers);
-	}
-
-	private function getGenerator(): Generator {
-		if ($this->generator === null) {
-			$this->generator = new Generator(
-				$this->config,
-				$this,
-				$this->appData,
-				new GeneratorHelper(
-					$this->rootFolder,
-					$this->config
-				),
-				$this->eventDispatcher
-			);
-		}
-		return $this->generator;
-	}
-
-	/**
-	 * Returns a preview of a file
-	 *
-	 * The cache is searched first and if nothing usable was found then a preview is
-	 * generated by one of the providers
-	 *
-	 * @param File $file
-	 * @param int $width
-	 * @param int $height
-	 * @param bool $crop
-	 * @param string $mode
-	 * @param string $mimeType
-	 * @return ISimpleFile
-	 * @throws NotFoundException
-	 * @throws \InvalidArgumentException if the preview would be invalid (in case the original image is invalid)
-	 * @since 11.0.0 - \InvalidArgumentException was added in 12.0.0
-	 */
-	public function getPreview(File $file, $width = -1, $height = -1, $crop = false, $mode = IPreview::MODE_FILL, $mimeType = null) {
-		return $this->getGenerator()->getPreview($file, $width, $height, $crop, $mode, $mimeType);
-	}
-
-	/**
-	 * Generates previews of a file
-	 *
-	 * @param File $file
-	 * @param array $specifications
-	 * @param string $mimeType
-	 * @return ISimpleFile the last preview that was generated
-	 * @throws NotFoundException
-	 * @throws \InvalidArgumentException if the preview would be invalid (in case the original image is invalid)
-	 * @since 19.0.0
-	 */
-	public function generatePreviews(File $file, array $specifications, $mimeType = null) {
-		return $this->getGenerator()->generatePreviews($file, $specifications, $mimeType);
-	}
-
-	/**
-	 * returns true if the passed mime type is supported
-	 *
-	 * @param string $mimeType
-	 * @return boolean
-	 */
-	public function isMimeSupported($mimeType = '*') {
-		if (!$this->config->getSystemValue('enable_previews', true)) {
-			return false;
-		}
-
-		if (isset($this->mimeTypeSupportMap[$mimeType])) {
-			return $this->mimeTypeSupportMap[$mimeType];
-		}
-
-		$this->registerCoreProviders();
-		$providerMimeTypes = array_keys($this->providers);
-		foreach ($providerMimeTypes as $supportedMimeType) {
-			if (preg_match($supportedMimeType, $mimeType)) {
-				$this->mimeTypeSupportMap[$mimeType] = true;
-				return true;
-			}
-		}
-		$this->mimeTypeSupportMap[$mimeType] = false;
-		return false;
-	}
-
-	/**
-	 * Check if a preview can be generated for a file
-	 *
-	 * @param \OCP\Files\FileInfo $file
-	 * @return bool
-	 */
-	public function isAvailable(\OCP\Files\FileInfo $file) {
-		if (!$this->config->getSystemValue('enable_previews', true)) {
-			return false;
-		}
-
-		$this->registerCoreProviders();
-		if (!$this->isMimeSupported($file->getMimetype())) {
-			return false;
-		}
-
-		$mount = $file->getMountPoint();
-		if ($mount and !$mount->getOption('previews', true)) {
-			return false;
-		}
-
-		foreach ($this->providers as $supportedMimeType => $providers) {
-			if (preg_match($supportedMimeType, $file->getMimetype())) {
-				foreach ($providers as $providerClosure) {
-					$provider = $this->helper->getProvider($providerClosure);
-					if (!($provider instanceof IProviderV2)) {
-						continue;
-					}
-
-					if ($provider->isAvailable($file)) {
-						return true;
-					}
-				}
-			}
-		}
-		return false;
-	}
-
-	/**
-	 * List of enabled default providers
-	 *
-	 * The following providers are enabled by default:
-	 *  - OC\Preview\PNG
-	 *  - OC\Preview\JPEG
-	 *  - OC\Preview\GIF
-	 *  - OC\Preview\BMP
-	 *  - OC\Preview\XBitmap
-	 *  - OC\Preview\MarkDown
-	 *  - OC\Preview\MP3
-	 *  - OC\Preview\TXT
-	 *
-	 * The following providers are disabled by default due to performance or privacy concerns:
-	 *  - OC\Preview\Font
-	 *  - OC\Preview\HEIC
-	 *  - OC\Preview\Illustrator
-	 *  - OC\Preview\Movie
-	 *  - OC\Preview\MSOfficeDoc
-	 *  - OC\Preview\MSOffice2003
-	 *  - OC\Preview\MSOffice2007
-	 *  - OC\Preview\OpenDocument
-	 *  - OC\Preview\PDF
-	 *  - OC\Preview\Photoshop
-	 *  - OC\Preview\Postscript
-	 *  - OC\Preview\StarOffice
-	 *  - OC\Preview\SVG
-	 *  - OC\Preview\TIFF
-	 *
-	 * @return array
-	 */
-	protected function getEnabledDefaultProvider() {
-		if ($this->defaultProviders !== null) {
-			return $this->defaultProviders;
-		}
-
-		$imageProviders = [
-			Preview\PNG::class,
-			Preview\JPEG::class,
-			Preview\GIF::class,
-			Preview\BMP::class,
-			Preview\XBitmap::class,
-			Preview\Krita::class,
-			Preview\WebP::class,
-		];
-
-		$this->defaultProviders = $this->config->getSystemValue('enabledPreviewProviders', array_merge([
-			Preview\MarkDown::class,
-			Preview\MP3::class,
-			Preview\TXT::class,
-			Preview\OpenDocument::class,
-		], $imageProviders));
-
-		if (in_array(Preview\Image::class, $this->defaultProviders)) {
-			$this->defaultProviders = array_merge($this->defaultProviders, $imageProviders);
-		}
-		$this->defaultProviders = array_unique($this->defaultProviders);
-		return $this->defaultProviders;
-	}
-
-	/**
-	 * Register the default providers (if enabled)
-	 *
-	 * @param string $class
-	 * @param string $mimeType
-	 */
-	protected function registerCoreProvider($class, $mimeType, $options = []) {
-		if (in_array(trim($class, '\\'), $this->getEnabledDefaultProvider())) {
-			$this->registerProvider($mimeType, function () use ($class, $options) {
-				return new $class($options);
-			});
-		}
-	}
-
-	/**
-	 * Register the default providers (if enabled)
-	 */
-	protected function registerCoreProviders() {
-		if ($this->registeredCoreProviders) {
-			return;
-		}
-		$this->registeredCoreProviders = true;
-
-		$this->registerCoreProvider(Preview\TXT::class, '/text\/plain/');
-		$this->registerCoreProvider(Preview\MarkDown::class, '/text\/(x-)?markdown/');
-		$this->registerCoreProvider(Preview\PNG::class, '/image\/png/');
-		$this->registerCoreProvider(Preview\JPEG::class, '/image\/jpeg/');
-		$this->registerCoreProvider(Preview\GIF::class, '/image\/gif/');
-		$this->registerCoreProvider(Preview\BMP::class, '/image\/bmp/');
-		$this->registerCoreProvider(Preview\XBitmap::class, '/image\/x-xbitmap/');
-		$this->registerCoreProvider(Preview\WebP::class, '/image\/webp/');
-		$this->registerCoreProvider(Preview\Krita::class, '/application\/x-krita/');
-		$this->registerCoreProvider(Preview\MP3::class, '/audio\/mpeg/');
-		$this->registerCoreProvider(Preview\OpenDocument::class, '/application\/vnd.oasis.opendocument.*/');
-
-		// SVG, Office and Bitmap require imagick
-		if (extension_loaded('imagick')) {
-			$checkImagick = new \Imagick();
-
-			$imagickProviders = [
-				'SVG' => ['mimetype' => '/image\/svg\+xml/', 'class' => Preview\SVG::class],
-				'TIFF' => ['mimetype' => '/image\/tiff/', 'class' => Preview\TIFF::class],
-				'PDF' => ['mimetype' => '/application\/pdf/', 'class' => Preview\PDF::class],
-				'AI' => ['mimetype' => '/application\/illustrator/', 'class' => Preview\Illustrator::class],
-				'PSD' => ['mimetype' => '/application\/x-photoshop/', 'class' => Preview\Photoshop::class],
-				'EPS' => ['mimetype' => '/application\/postscript/', 'class' => Preview\Postscript::class],
-				'TTF' => ['mimetype' => '/application\/(?:font-sfnt|x-font$)/', 'class' => Preview\Font::class],
-				'HEIC' => ['mimetype' => '/image\/hei(f|c)/', 'class' => Preview\HEIC::class],
-				'TGA' => ['mimetype' => '/image\/t(ar)?ga/', 'class' => Preview\TGA::class],
-				'SGI' => ['mimetype' => '/image\/sgi/', 'class' => Preview\SGI::class],
-			];
-
-			foreach ($imagickProviders as $queryFormat => $provider) {
-				$class = $provider['class'];
-				if (!in_array(trim($class, '\\'), $this->getEnabledDefaultProvider())) {
-					continue;
-				}
-
-				if (count($checkImagick->queryFormats($queryFormat)) === 1) {
-					$this->registerCoreProvider($class, $provider['mimetype']);
-				}
-			}
-
-			if (count($checkImagick->queryFormats('PDF')) === 1) {
-				if (\OC_Helper::is_function_enabled('shell_exec')) {
-					$officeFound = is_string($this->config->getSystemValue('preview_libreoffice_path', null));
-
-					if (!$officeFound) {
-						//let's see if there is libreoffice or openoffice on this machine
-						$whichLibreOffice = shell_exec('command -v libreoffice');
-						$officeFound = !empty($whichLibreOffice);
-						if (!$officeFound) {
-							$whichOpenOffice = shell_exec('command -v openoffice');
-							$officeFound = !empty($whichOpenOffice);
-						}
-					}
-
-					if ($officeFound) {
-						$this->registerCoreProvider(Preview\MSOfficeDoc::class, '/application\/msword/');
-						$this->registerCoreProvider(Preview\MSOffice2003::class, '/application\/vnd.ms-.*/');
-						$this->registerCoreProvider(Preview\MSOffice2007::class, '/application\/vnd.openxmlformats-officedocument.*/');
-						$this->registerCoreProvider(Preview\OpenDocument::class, '/application\/vnd.oasis.opendocument.*/');
-						$this->registerCoreProvider(Preview\StarOffice::class, '/application\/vnd.sun.xml.*/');
-					}
-				}
-			}
-		}
-
-		// Video requires avconv or ffmpeg
-		if (in_array(Preview\Movie::class, $this->getEnabledDefaultProvider())) {
-			$avconvBinary = \OC_Helper::findBinaryPath('avconv');
-			$ffmpegBinary = $avconvBinary ? null : \OC_Helper::findBinaryPath('ffmpeg');
-
-			if ($avconvBinary || $ffmpegBinary) {
-				// FIXME // a bit hacky but didn't want to use subclasses
-				\OC\Preview\Movie::$avconvBinary = $avconvBinary;
-				\OC\Preview\Movie::$ffmpegBinary = $ffmpegBinary;
-
-				$this->registerCoreProvider(Preview\Movie::class, '/video\/.*/');
-			}
-		}
-	}
+    /** @var IConfig */
+    protected $config;
+
+    /** @var IRootFolder */
+    protected $rootFolder;
+
+    /** @var IAppData */
+    protected $appData;
+
+    /** @var EventDispatcherInterface */
+    protected $eventDispatcher;
+
+    /** @var Generator */
+    private $generator;
+
+    /** @var GeneratorHelper */
+    private $helper;
+
+    /** @var bool */
+    protected $providerListDirty = false;
+
+    /** @var bool */
+    protected $registeredCoreProviders = false;
+
+    /** @var array */
+    protected $providers = [];
+
+    /** @var array mime type => support status */
+    protected $mimeTypeSupportMap = [];
+
+    /** @var array */
+    protected $defaultProviders;
+
+    /** @var string */
+    protected $userId;
+
+    /**
+     * PreviewManager constructor.
+     *
+     * @param IConfig $config
+     * @param IRootFolder $rootFolder
+     * @param IAppData $appData
+     * @param EventDispatcherInterface $eventDispatcher
+     * @param string $userId
+     */
+    public function __construct(IConfig $config,
+                                IRootFolder $rootFolder,
+                                IAppData $appData,
+                                EventDispatcherInterface $eventDispatcher,
+                                GeneratorHelper $helper,
+                                $userId) {
+        $this->config = $config;
+        $this->rootFolder = $rootFolder;
+        $this->appData = $appData;
+        $this->eventDispatcher = $eventDispatcher;
+        $this->helper = $helper;
+        $this->userId = $userId;
+    }
+
+    /**
+     * In order to improve lazy loading a closure can be registered which will be
+     * called in case preview providers are actually requested
+     *
+     * $callable has to return an instance of \OCP\Preview\IProvider or \OCP\Preview\IProviderV2
+     *
+     * @param string $mimeTypeRegex Regex with the mime types that are supported by this provider
+     * @param \Closure $callable
+     * @return void
+     */
+    public function registerProvider($mimeTypeRegex, \Closure $callable) {
+        if (!$this->config->getSystemValue('enable_previews', true)) {
+            return;
+        }
+
+        if (!isset($this->providers[$mimeTypeRegex])) {
+            $this->providers[$mimeTypeRegex] = [];
+        }
+        $this->providers[$mimeTypeRegex][] = $callable;
+        $this->providerListDirty = true;
+    }
+
+    /**
+     * Get all providers
+     * @return array
+     */
+    public function getProviders() {
+        if (!$this->config->getSystemValue('enable_previews', true)) {
+            return [];
+        }
+
+        $this->registerCoreProviders();
+        if ($this->providerListDirty) {
+            $keys = array_map('strlen', array_keys($this->providers));
+            array_multisort($keys, SORT_DESC, $this->providers);
+            $this->providerListDirty = false;
+        }
+
+        return $this->providers;
+    }
+
+    /**
+     * Does the manager have any providers
+     * @return bool
+     */
+    public function hasProviders() {
+        $this->registerCoreProviders();
+        return !empty($this->providers);
+    }
+
+    private function getGenerator(): Generator {
+        if ($this->generator === null) {
+            $this->generator = new Generator(
+                $this->config,
+                $this,
+                $this->appData,
+                new GeneratorHelper(
+                    $this->rootFolder,
+                    $this->config
+                ),
+                $this->eventDispatcher
+            );
+        }
+        return $this->generator;
+    }
+
+    /**
+     * Returns a preview of a file
+     *
+     * The cache is searched first and if nothing usable was found then a preview is
+     * generated by one of the providers
+     *
+     * @param File $file
+     * @param int $width
+     * @param int $height
+     * @param bool $crop
+     * @param string $mode
+     * @param string $mimeType
+     * @return ISimpleFile
+     * @throws NotFoundException
+     * @throws \InvalidArgumentException if the preview would be invalid (in case the original image is invalid)
+     * @since 11.0.0 - \InvalidArgumentException was added in 12.0.0
+     */
+    public function getPreview(File $file, $width = -1, $height = -1, $crop = false, $mode = IPreview::MODE_FILL, $mimeType = null) {
+        return $this->getGenerator()->getPreview($file, $width, $height, $crop, $mode, $mimeType);
+    }
+
+    /**
+     * Generates previews of a file
+     *
+     * @param File $file
+     * @param array $specifications
+     * @param string $mimeType
+     * @return ISimpleFile the last preview that was generated
+     * @throws NotFoundException
+     * @throws \InvalidArgumentException if the preview would be invalid (in case the original image is invalid)
+     * @since 19.0.0
+     */
+    public function generatePreviews(File $file, array $specifications, $mimeType = null) {
+        return $this->getGenerator()->generatePreviews($file, $specifications, $mimeType);
+    }
+
+    /**
+     * returns true if the passed mime type is supported
+     *
+     * @param string $mimeType
+     * @return boolean
+     */
+    public function isMimeSupported($mimeType = '*') {
+        if (!$this->config->getSystemValue('enable_previews', true)) {
+            return false;
+        }
+
+        if (isset($this->mimeTypeSupportMap[$mimeType])) {
+            return $this->mimeTypeSupportMap[$mimeType];
+        }
+
+        $this->registerCoreProviders();
+        $providerMimeTypes = array_keys($this->providers);
+        foreach ($providerMimeTypes as $supportedMimeType) {
+            if (preg_match($supportedMimeType, $mimeType)) {
+                $this->mimeTypeSupportMap[$mimeType] = true;
+                return true;
+            }
+        }
+        $this->mimeTypeSupportMap[$mimeType] = false;
+        return false;
+    }
+
+    /**
+     * Check if a preview can be generated for a file
+     *
+     * @param \OCP\Files\FileInfo $file
+     * @return bool
+     */
+    public function isAvailable(\OCP\Files\FileInfo $file) {
+        if (!$this->config->getSystemValue('enable_previews', true)) {
+            return false;
+        }
+
+        $this->registerCoreProviders();
+        if (!$this->isMimeSupported($file->getMimetype())) {
+            return false;
+        }
+
+        $mount = $file->getMountPoint();
+        if ($mount and !$mount->getOption('previews', true)) {
+            return false;
+        }
+
+        foreach ($this->providers as $supportedMimeType => $providers) {
+            if (preg_match($supportedMimeType, $file->getMimetype())) {
+                foreach ($providers as $providerClosure) {
+                    $provider = $this->helper->getProvider($providerClosure);
+                    if (!($provider instanceof IProviderV2)) {
+                        continue;
+                    }
+
+                    if ($provider->isAvailable($file)) {
+                        return true;
+                    }
+                }
+            }
+        }
+        return false;
+    }
+
+    /**
+     * List of enabled default providers
+     *
+     * The following providers are enabled by default:
+     *  - OC\Preview\PNG
+     *  - OC\Preview\JPEG
+     *  - OC\Preview\GIF
+     *  - OC\Preview\BMP
+     *  - OC\Preview\XBitmap
+     *  - OC\Preview\MarkDown
+     *  - OC\Preview\MP3
+     *  - OC\Preview\TXT
+     *
+     * The following providers are disabled by default due to performance or privacy concerns:
+     *  - OC\Preview\Font
+     *  - OC\Preview\HEIC
+     *  - OC\Preview\Illustrator
+     *  - OC\Preview\Movie
+     *  - OC\Preview\MSOfficeDoc
+     *  - OC\Preview\MSOffice2003
+     *  - OC\Preview\MSOffice2007
+     *  - OC\Preview\OpenDocument
+     *  - OC\Preview\PDF
+     *  - OC\Preview\Photoshop
+     *  - OC\Preview\Postscript
+     *  - OC\Preview\StarOffice
+     *  - OC\Preview\SVG
+     *  - OC\Preview\TIFF
+     *
+     * @return array
+     */
+    protected function getEnabledDefaultProvider() {
+        if ($this->defaultProviders !== null) {
+            return $this->defaultProviders;
+        }
+
+        $imageProviders = [
+            Preview\PNG::class,
+            Preview\JPEG::class,
+            Preview\GIF::class,
+            Preview\BMP::class,
+            Preview\XBitmap::class,
+            Preview\Krita::class,
+            Preview\WebP::class,
+        ];
+
+        $this->defaultProviders = $this->config->getSystemValue('enabledPreviewProviders', array_merge([
+            Preview\MarkDown::class,
+            Preview\MP3::class,
+            Preview\TXT::class,
+            Preview\OpenDocument::class,
+        ], $imageProviders));
+
+        if (in_array(Preview\Image::class, $this->defaultProviders)) {
+            $this->defaultProviders = array_merge($this->defaultProviders, $imageProviders);
+        }
+        $this->defaultProviders = array_unique($this->defaultProviders);
+        return $this->defaultProviders;
+    }
+
+    /**
+     * Register the default providers (if enabled)
+     *
+     * @param string $class
+     * @param string $mimeType
+     */
+    protected function registerCoreProvider($class, $mimeType, $options = []) {
+        if (in_array(trim($class, '\\'), $this->getEnabledDefaultProvider())) {
+            $this->registerProvider($mimeType, function () use ($class, $options) {
+                return new $class($options);
+            });
+        }
+    }
+
+    /**
+     * Register the default providers (if enabled)
+     */
+    protected function registerCoreProviders() {
+        if ($this->registeredCoreProviders) {
+            return;
+        }
+        $this->registeredCoreProviders = true;
+
+        $this->registerCoreProvider(Preview\TXT::class, '/text\/plain/');
+        $this->registerCoreProvider(Preview\MarkDown::class, '/text\/(x-)?markdown/');
+        $this->registerCoreProvider(Preview\PNG::class, '/image\/png/');
+        $this->registerCoreProvider(Preview\JPEG::class, '/image\/jpeg/');
+        $this->registerCoreProvider(Preview\GIF::class, '/image\/gif/');
+        $this->registerCoreProvider(Preview\BMP::class, '/image\/bmp/');
+        $this->registerCoreProvider(Preview\XBitmap::class, '/image\/x-xbitmap/');
+        $this->registerCoreProvider(Preview\WebP::class, '/image\/webp/');
+        $this->registerCoreProvider(Preview\Krita::class, '/application\/x-krita/');
+        $this->registerCoreProvider(Preview\MP3::class, '/audio\/mpeg/');
+        $this->registerCoreProvider(Preview\OpenDocument::class, '/application\/vnd.oasis.opendocument.*/');
+
+        // SVG, Office and Bitmap require imagick
+        if (extension_loaded('imagick')) {
+            $checkImagick = new \Imagick();
+
+            $imagickProviders = [
+                'SVG' => ['mimetype' => '/image\/svg\+xml/', 'class' => Preview\SVG::class],
+                'TIFF' => ['mimetype' => '/image\/tiff/', 'class' => Preview\TIFF::class],
+                'PDF' => ['mimetype' => '/application\/pdf/', 'class' => Preview\PDF::class],
+                'AI' => ['mimetype' => '/application\/illustrator/', 'class' => Preview\Illustrator::class],
+                'PSD' => ['mimetype' => '/application\/x-photoshop/', 'class' => Preview\Photoshop::class],
+                'EPS' => ['mimetype' => '/application\/postscript/', 'class' => Preview\Postscript::class],
+                'TTF' => ['mimetype' => '/application\/(?:font-sfnt|x-font$)/', 'class' => Preview\Font::class],
+                'HEIC' => ['mimetype' => '/image\/hei(f|c)/', 'class' => Preview\HEIC::class],
+                'TGA' => ['mimetype' => '/image\/t(ar)?ga/', 'class' => Preview\TGA::class],
+                'SGI' => ['mimetype' => '/image\/sgi/', 'class' => Preview\SGI::class],
+            ];
+
+            foreach ($imagickProviders as $queryFormat => $provider) {
+                $class = $provider['class'];
+                if (!in_array(trim($class, '\\'), $this->getEnabledDefaultProvider())) {
+                    continue;
+                }
+
+                if (count($checkImagick->queryFormats($queryFormat)) === 1) {
+                    $this->registerCoreProvider($class, $provider['mimetype']);
+                }
+            }
+
+            if (count($checkImagick->queryFormats('PDF')) === 1) {
+                if (\OC_Helper::is_function_enabled('shell_exec')) {
+                    $officeFound = is_string($this->config->getSystemValue('preview_libreoffice_path', null));
+
+                    if (!$officeFound) {
+                        //let's see if there is libreoffice or openoffice on this machine
+                        $whichLibreOffice = shell_exec('command -v libreoffice');
+                        $officeFound = !empty($whichLibreOffice);
+                        if (!$officeFound) {
+                            $whichOpenOffice = shell_exec('command -v openoffice');
+                            $officeFound = !empty($whichOpenOffice);
+                        }
+                    }
+
+                    if ($officeFound) {
+                        $this->registerCoreProvider(Preview\MSOfficeDoc::class, '/application\/msword/');
+                        $this->registerCoreProvider(Preview\MSOffice2003::class, '/application\/vnd.ms-.*/');
+                        $this->registerCoreProvider(Preview\MSOffice2007::class, '/application\/vnd.openxmlformats-officedocument.*/');
+                        $this->registerCoreProvider(Preview\OpenDocument::class, '/application\/vnd.oasis.opendocument.*/');
+                        $this->registerCoreProvider(Preview\StarOffice::class, '/application\/vnd.sun.xml.*/');
+                    }
+                }
+            }
+        }
+
+        // Video requires avconv or ffmpeg
+        if (in_array(Preview\Movie::class, $this->getEnabledDefaultProvider())) {
+            $avconvBinary = \OC_Helper::findBinaryPath('avconv');
+            $ffmpegBinary = $avconvBinary ? null : \OC_Helper::findBinaryPath('ffmpeg');
+
+            if ($avconvBinary || $ffmpegBinary) {
+                // FIXME // a bit hacky but didn't want to use subclasses
+                \OC\Preview\Movie::$avconvBinary = $avconvBinary;
+                \OC\Preview\Movie::$ffmpegBinary = $ffmpegBinary;
+
+                $this->registerCoreProvider(Preview\Movie::class, '/video\/.*/');
+            }
+        }
+    }
 }