nextcloud / server

lib/private/PreviewManager.php

Indentation +432 added lines, -432 removed lines

@@ -28,436 +28,436 @@
 use function array_key_exists;
 
 class PreviewManager implements IPreview {
-	protected IConfig $config;
-	protected IRootFolder $rootFolder;
-	protected IAppData $appData;
-	protected IEventDispatcher $eventDispatcher;
-	private ?Generator $generator = null;
-	private GeneratorHelper $helper;
-	protected bool $providerListDirty = false;
-	protected bool $registeredCoreProviders = false;
-	protected array $providers = [];
-
-	/** @var array mime type => support status */
-	protected array $mimeTypeSupportMap = [];
-	protected ?array $defaultProviders = null;
-	protected ?string $userId;
-	private Coordinator $bootstrapCoordinator;
-
-	/**
-	 * Hash map (without value) of loaded bootstrap providers
-	 * @psalm-var array<string, null>
-	 */
-	private array $loadedBootstrapProviders = [];
-	private ContainerInterface $container;
-	private IBinaryFinder $binaryFinder;
-	private IMagickSupport $imagickSupport;
-	private bool $enablePreviews;
-
-	public function __construct(
-		IConfig $config,
-		IRootFolder $rootFolder,
-		IAppData $appData,
-		IEventDispatcher $eventDispatcher,
-		GeneratorHelper $helper,
-		?string $userId,
-		Coordinator $bootstrapCoordinator,
-		ContainerInterface $container,
-		IBinaryFinder $binaryFinder,
-		IMagickSupport $imagickSupport,
-	) {
-		$this->config = $config;
-		$this->rootFolder = $rootFolder;
-		$this->appData = $appData;
-		$this->eventDispatcher = $eventDispatcher;
-		$this->helper = $helper;
-		$this->userId = $userId;
-		$this->bootstrapCoordinator = $bootstrapCoordinator;
-		$this->container = $container;
-		$this->binaryFinder = $binaryFinder;
-		$this->imagickSupport = $imagickSupport;
-		$this->enablePreviews = $config->getSystemValueBool('enable_previews', true);
-	}
-
-	/**
-	 * 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 $callable): void {
-		if (!$this->enablePreviews) {
-			return;
-		}
-
-		if (!isset($this->providers[$mimeTypeRegex])) {
-			$this->providers[$mimeTypeRegex] = [];
-		}
-		$this->providers[$mimeTypeRegex][] = $callable;
-		$this->providerListDirty = true;
-	}
-
-	/**
-	 * Get all providers
-	 */
-	public function getProviders(): array {
-		if (!$this->enablePreviews) {
-			return [];
-		}
-
-		$this->registerCoreProviders();
-		$this->registerBootstrapProviders();
-		if ($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
-	 */
-	public function hasProviders(): bool {
-		$this->registerCoreProviders();
-		return !empty($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,
-				$this->container->get(LoggerInterface::class),
-			);
-		}
-		return $this->generator;
-	}
-
-	public function getPreview(
-		File $file,
-		$width = -1,
-		$height = -1,
-		$crop = false,
-		$mode = IPreview::MODE_FILL,
-		$mimeType = null,
-		bool $cacheResult = true,
-	): ISimpleFile {
-		$this->throwIfPreviewsDisabled($file);
-		$previewConcurrency = $this->getGenerator()->getNumConcurrentPreviews('preview_concurrency_all');
-		$sem = Generator::guardWithSemaphore(Generator::SEMAPHORE_ID_ALL, $previewConcurrency);
-		try {
-			$preview = $this->getGenerator()->getPreview($file, $width, $height, $crop, $mode, $mimeType, $cacheResult);
-		} finally {
-			Generator::unguardWithSemaphore($sem);
-		}
-
-		return $preview;
-	}
-
-	/**
-	 * 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) {
-		$this->throwIfPreviewsDisabled($file);
-		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 (!$this->enablePreviews) {
-			return false;
-		}
-
-		if (isset($this->mimeTypeSupportMap[$mimeType])) {
-			return $this->mimeTypeSupportMap[$mimeType];
-		}
-
-		$this->registerCoreProviders();
-		$this->registerBootstrapProviders();
-		$providerMimeTypes = array_keys($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
-	 */
-	public function isAvailable(\OCP\Files\FileInfo $file): bool {
-		if (!$this->enablePreviews) {
-			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.*/');
-		$this->registerCoreProvider(Preview\Imaginary::class, Preview\Imaginary::supportedMimeTypes());
-		$this->registerCoreProvider(Preview\ImaginaryPDF::class, Preview\ImaginaryPDF::supportedMimeTypes());
-
-		// SVG and Bitmap require imagick
-		if ($this->imagickSupport->hasExtension()) {
-			$imagickProviders = [
-				'SVG' => ['mimetype' => '/image\/svg\+xml/', 'class' => Preview\SVG::class],
-				'TIFF' => ['mimetype' => '/image\/tiff/', 'class' => Preview\TIFF::class],
-				'PDF' => ['mimetype' => '/application\/pdf/', 'class' => Preview\PDF::class],
-				'AI' => ['mimetype' => '/application\/illustrator/', 'class' => Preview\Illustrator::class],
-				'PSD' => ['mimetype' => '/application\/x-photoshop/', 'class' => Preview\Photoshop::class],
-				'EPS' => ['mimetype' => '/application\/postscript/', 'class' => Preview\Postscript::class],
-				'TTF' => ['mimetype' => '/application\/(?:font-sfnt|x-font$)/', 'class' => Preview\Font::class],
-				'HEIC' => ['mimetype' => '/image\/(x-)?hei(f|c)/', 'class' => Preview\HEIC::class],
-				'TGA' => ['mimetype' => '/image\/(x-)?t(ar)?ga/', 'class' => Preview\TGA::class],
-				'SGI' => ['mimetype' => '/image\/(x-)?sgi/', 'class' => Preview\SGI::class],
-			];
-
-			foreach ($imagickProviders as $queryFormat => $provider) {
-				$class = $provider['class'];
-				if (!in_array(trim($class, '\\'), $this->getEnabledDefaultProvider())) {
-					continue;
-				}
-
-				if ($this->imagickSupport->supportsFormat($queryFormat)) {
-					$this->registerCoreProvider($class, $provider['mimetype']);
-				}
-			}
-		}
-
-		$this->registerCoreProvidersOffice();
-
-		// Video requires avconv or ffmpeg
-		if (in_array(Preview\Movie::class, $this->getEnabledDefaultProvider())) {
-			$movieBinary = $this->config->getSystemValue('preview_ffmpeg_path', null);
-			if (!is_string($movieBinary)) {
-				$movieBinary = $this->binaryFinder->findBinaryPath('avconv');
-				if (!is_string($movieBinary)) {
-					$movieBinary = $this->binaryFinder->findBinaryPath('ffmpeg');
-				}
-			}
-
-
-			if (is_string($movieBinary)) {
-				$this->registerCoreProvider(Preview\Movie::class, '/video\/.*/', ['movieBinary' => $movieBinary]);
-			}
-		}
-	}
-
-	private function registerCoreProvidersOffice(): void {
-		$officeProviders = [
-			['mimetype' => '/application\/msword/', 'class' => Preview\MSOfficeDoc::class],
-			['mimetype' => '/application\/vnd.ms-.*/', 'class' => Preview\MSOffice2003::class],
-			['mimetype' => '/application\/vnd.openxmlformats-officedocument.*/', 'class' => Preview\MSOffice2007::class],
-			['mimetype' => '/application\/vnd.oasis.opendocument.*/', 'class' => Preview\OpenDocument::class],
-			['mimetype' => '/application\/vnd.sun.xml.*/', 'class' => Preview\StarOffice::class],
-			['mimetype' => '/image\/emf/', 'class' => Preview\EMF::class],
-		];
-
-		$findBinary = true;
-		$officeBinary = false;
-
-		foreach ($officeProviders as $provider) {
-			$class = $provider['class'];
-			if (!in_array(trim($class, '\\'), $this->getEnabledDefaultProvider())) {
-				continue;
-			}
-
-			if ($findBinary) {
-				// Office requires openoffice or libreoffice
-				$officeBinary = $this->config->getSystemValue('preview_libreoffice_path', false);
-				if ($officeBinary === false) {
-					$officeBinary = $this->binaryFinder->findBinaryPath('libreoffice');
-				}
-				if ($officeBinary === false) {
-					$officeBinary = $this->binaryFinder->findBinaryPath('openoffice');
-				}
-				$findBinary = false;
-			}
-
-			if ($officeBinary) {
-				$this->registerCoreProvider($class, $provider['mimetype'], ['officeBinary' => $officeBinary]);
-			}
-		}
-	}
-
-	private function registerBootstrapProviders(): void {
-		$context = $this->bootstrapCoordinator->getRegistrationContext();
-
-		if ($context === null) {
-			// Just ignore for now
-			return;
-		}
-
-		$providers = $context->getPreviewProviders();
-		foreach ($providers as $provider) {
-			$key = $provider->getMimeTypeRegex() . '-' . $provider->getService();
-			if (array_key_exists($key, $this->loadedBootstrapProviders)) {
-				// Do not load the provider more than once
-				continue;
-			}
-			$this->loadedBootstrapProviders[$key] = null;
-
-			$this->registerProvider($provider->getMimeTypeRegex(), function () use ($provider) {
-				try {
-					return $this->container->get($provider->getService());
-				} catch (QueryException $e) {
-					return null;
-				}
-			});
-		}
-	}
-
-	/**
-	 * @throws NotFoundException if preview generation is disabled
-	 */
-	private function throwIfPreviewsDisabled(File $file): void {
-		if (!$this->isAvailable($file)) {
-			throw new NotFoundException('Previews disabled');
-		}
-	}
+    protected IConfig $config;
+    protected IRootFolder $rootFolder;
+    protected IAppData $appData;
+    protected IEventDispatcher $eventDispatcher;
+    private ?Generator $generator = null;
+    private GeneratorHelper $helper;
+    protected bool $providerListDirty = false;
+    protected bool $registeredCoreProviders = false;
+    protected array $providers = [];
+
+    /** @var array mime type => support status */
+    protected array $mimeTypeSupportMap = [];
+    protected ?array $defaultProviders = null;
+    protected ?string $userId;
+    private Coordinator $bootstrapCoordinator;
+
+    /**
+     * Hash map (without value) of loaded bootstrap providers
+     * @psalm-var array<string, null>
+     */
+    private array $loadedBootstrapProviders = [];
+    private ContainerInterface $container;
+    private IBinaryFinder $binaryFinder;
+    private IMagickSupport $imagickSupport;
+    private bool $enablePreviews;
+
+    public function __construct(
+        IConfig $config,
+        IRootFolder $rootFolder,
+        IAppData $appData,
+        IEventDispatcher $eventDispatcher,
+        GeneratorHelper $helper,
+        ?string $userId,
+        Coordinator $bootstrapCoordinator,
+        ContainerInterface $container,
+        IBinaryFinder $binaryFinder,
+        IMagickSupport $imagickSupport,
+    ) {
+        $this->config = $config;
+        $this->rootFolder = $rootFolder;
+        $this->appData = $appData;
+        $this->eventDispatcher = $eventDispatcher;
+        $this->helper = $helper;
+        $this->userId = $userId;
+        $this->bootstrapCoordinator = $bootstrapCoordinator;
+        $this->container = $container;
+        $this->binaryFinder = $binaryFinder;
+        $this->imagickSupport = $imagickSupport;
+        $this->enablePreviews = $config->getSystemValueBool('enable_previews', true);
+    }
+
+    /**
+     * 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 $callable): void {
+        if (!$this->enablePreviews) {
+            return;
+        }
+
+        if (!isset($this->providers[$mimeTypeRegex])) {
+            $this->providers[$mimeTypeRegex] = [];
+        }
+        $this->providers[$mimeTypeRegex][] = $callable;
+        $this->providerListDirty = true;
+    }
+
+    /**
+     * Get all providers
+     */
+    public function getProviders(): array {
+        if (!$this->enablePreviews) {
+            return [];
+        }
+
+        $this->registerCoreProviders();
+        $this->registerBootstrapProviders();
+        if ($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
+     */
+    public function hasProviders(): bool {
+        $this->registerCoreProviders();
+        return !empty($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,
+                $this->container->get(LoggerInterface::class),
+            );
+        }
+        return $this->generator;
+    }
+
+    public function getPreview(
+        File $file,
+        $width = -1,
+        $height = -1,
+        $crop = false,
+        $mode = IPreview::MODE_FILL,
+        $mimeType = null,
+        bool $cacheResult = true,
+    ): ISimpleFile {
+        $this->throwIfPreviewsDisabled($file);
+        $previewConcurrency = $this->getGenerator()->getNumConcurrentPreviews('preview_concurrency_all');
+        $sem = Generator::guardWithSemaphore(Generator::SEMAPHORE_ID_ALL, $previewConcurrency);
+        try {
+            $preview = $this->getGenerator()->getPreview($file, $width, $height, $crop, $mode, $mimeType, $cacheResult);
+        } finally {
+            Generator::unguardWithSemaphore($sem);
+        }
+
+        return $preview;
+    }
+
+    /**
+     * 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) {
+        $this->throwIfPreviewsDisabled($file);
+        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 (!$this->enablePreviews) {
+            return false;
+        }
+
+        if (isset($this->mimeTypeSupportMap[$mimeType])) {
+            return $this->mimeTypeSupportMap[$mimeType];
+        }
+
+        $this->registerCoreProviders();
+        $this->registerBootstrapProviders();
+        $providerMimeTypes = array_keys($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
+     */
+    public function isAvailable(\OCP\Files\FileInfo $file): bool {
+        if (!$this->enablePreviews) {
+            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.*/');
+        $this->registerCoreProvider(Preview\Imaginary::class, Preview\Imaginary::supportedMimeTypes());
+        $this->registerCoreProvider(Preview\ImaginaryPDF::class, Preview\ImaginaryPDF::supportedMimeTypes());
+
+        // SVG and Bitmap require imagick
+        if ($this->imagickSupport->hasExtension()) {
+            $imagickProviders = [
+                'SVG' => ['mimetype' => '/image\/svg\+xml/', 'class' => Preview\SVG::class],
+                'TIFF' => ['mimetype' => '/image\/tiff/', 'class' => Preview\TIFF::class],
+                'PDF' => ['mimetype' => '/application\/pdf/', 'class' => Preview\PDF::class],
+                'AI' => ['mimetype' => '/application\/illustrator/', 'class' => Preview\Illustrator::class],
+                'PSD' => ['mimetype' => '/application\/x-photoshop/', 'class' => Preview\Photoshop::class],
+                'EPS' => ['mimetype' => '/application\/postscript/', 'class' => Preview\Postscript::class],
+                'TTF' => ['mimetype' => '/application\/(?:font-sfnt|x-font$)/', 'class' => Preview\Font::class],
+                'HEIC' => ['mimetype' => '/image\/(x-)?hei(f|c)/', 'class' => Preview\HEIC::class],
+                'TGA' => ['mimetype' => '/image\/(x-)?t(ar)?ga/', 'class' => Preview\TGA::class],
+                'SGI' => ['mimetype' => '/image\/(x-)?sgi/', 'class' => Preview\SGI::class],
+            ];
+
+            foreach ($imagickProviders as $queryFormat => $provider) {
+                $class = $provider['class'];
+                if (!in_array(trim($class, '\\'), $this->getEnabledDefaultProvider())) {
+                    continue;
+                }
+
+                if ($this->imagickSupport->supportsFormat($queryFormat)) {
+                    $this->registerCoreProvider($class, $provider['mimetype']);
+                }
+            }
+        }
+
+        $this->registerCoreProvidersOffice();
+
+        // Video requires avconv or ffmpeg
+        if (in_array(Preview\Movie::class, $this->getEnabledDefaultProvider())) {
+            $movieBinary = $this->config->getSystemValue('preview_ffmpeg_path', null);
+            if (!is_string($movieBinary)) {
+                $movieBinary = $this->binaryFinder->findBinaryPath('avconv');
+                if (!is_string($movieBinary)) {
+                    $movieBinary = $this->binaryFinder->findBinaryPath('ffmpeg');
+                }
+            }
+
+
+            if (is_string($movieBinary)) {
+                $this->registerCoreProvider(Preview\Movie::class, '/video\/.*/', ['movieBinary' => $movieBinary]);
+            }
+        }
+    }
+
+    private function registerCoreProvidersOffice(): void {
+        $officeProviders = [
+            ['mimetype' => '/application\/msword/', 'class' => Preview\MSOfficeDoc::class],
+            ['mimetype' => '/application\/vnd.ms-.*/', 'class' => Preview\MSOffice2003::class],
+            ['mimetype' => '/application\/vnd.openxmlformats-officedocument.*/', 'class' => Preview\MSOffice2007::class],
+            ['mimetype' => '/application\/vnd.oasis.opendocument.*/', 'class' => Preview\OpenDocument::class],
+            ['mimetype' => '/application\/vnd.sun.xml.*/', 'class' => Preview\StarOffice::class],
+            ['mimetype' => '/image\/emf/', 'class' => Preview\EMF::class],
+        ];
+
+        $findBinary = true;
+        $officeBinary = false;
+
+        foreach ($officeProviders as $provider) {
+            $class = $provider['class'];
+            if (!in_array(trim($class, '\\'), $this->getEnabledDefaultProvider())) {
+                continue;
+            }
+
+            if ($findBinary) {
+                // Office requires openoffice or libreoffice
+                $officeBinary = $this->config->getSystemValue('preview_libreoffice_path', false);
+                if ($officeBinary === false) {
+                    $officeBinary = $this->binaryFinder->findBinaryPath('libreoffice');
+                }
+                if ($officeBinary === false) {
+                    $officeBinary = $this->binaryFinder->findBinaryPath('openoffice');
+                }
+                $findBinary = false;
+            }
+
+            if ($officeBinary) {
+                $this->registerCoreProvider($class, $provider['mimetype'], ['officeBinary' => $officeBinary]);
+            }
+        }
+    }
+
+    private function registerBootstrapProviders(): void {
+        $context = $this->bootstrapCoordinator->getRegistrationContext();
+
+        if ($context === null) {
+            // Just ignore for now
+            return;
+        }
+
+        $providers = $context->getPreviewProviders();
+        foreach ($providers as $provider) {
+            $key = $provider->getMimeTypeRegex() . '-' . $provider->getService();
+            if (array_key_exists($key, $this->loadedBootstrapProviders)) {
+                // Do not load the provider more than once
+                continue;
+            }
+            $this->loadedBootstrapProviders[$key] = null;
+
+            $this->registerProvider($provider->getMimeTypeRegex(), function () use ($provider) {
+                try {
+                    return $this->container->get($provider->getService());
+                } catch (QueryException $e) {
+                    return null;
+                }
+            });
+        }
+    }
+
+    /**
+     * @throws NotFoundException if preview generation is disabled
+     */
+    private function throwIfPreviewsDisabled(File $file): void {
+        if (!$this->isAvailable($file)) {
+            throw new NotFoundException('Previews disabled');
+        }
+    }
 }