266 lines
8.0 KiB
PHP
266 lines
8.0 KiB
PHP
<?php
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/**
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* Copyright (c) 2013 Thomas Müller thomas.mueller@tmit.eu
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* This file is licensed under the Affero General Public License version 3 or
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* later.
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* See the COPYING-README file.
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*
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*/
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namespace OC;
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use OCP\image;
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use OCP\IPreview;
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class PreviewManager implements IPreview {
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/** @var array */
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protected $providers = [];
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/**
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* Constructor
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*/
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public function __construct() {
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$this->registerCoreProviders();
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}
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/**
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* In order to improve lazy loading a closure can be registered which will be
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* called in case preview providers are actually requested
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*
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* $callable has to return an instance of \OC\Preview\Provider
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*
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* @param string $mimeTypeRegex Regex with the mime types that are supported by this provider
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* @param \Closure $callable
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* @return void
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*/
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public function registerProvider($mimeTypeRegex, \Closure $callable) {
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if (!\OC::$server->getConfig()->getSystemValue('enable_previews', true)) {
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return;
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}
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if (!isset($this->providers[$mimeTypeRegex])) {
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$this->providers[$mimeTypeRegex] = [];
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}
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$this->providers[$mimeTypeRegex][] = $callable;
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}
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/**
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* Get all providers
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* @return array
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*/
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public function getProviders() {
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$keys = array_map('strlen', array_keys($this->providers));
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array_multisort($keys, SORT_DESC, $this->providers);
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return $this->providers;
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}
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/**
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* Does the manager have any providers
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* @return bool
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*/
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public function hasProviders() {
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return !empty($this->providers);
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}
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/**
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* return a preview of a file
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*
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* @param string $file The path to the file where you want a thumbnail from
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* @param int $maxX The maximum X size of the thumbnail. It can be smaller depending on the shape of the image
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* @param int $maxY The maximum Y size of the thumbnail. It can be smaller depending on the shape of the image
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* @param boolean $scaleUp Scale smaller images up to the thumbnail size or not. Might look ugly
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* @return \OCP\Image
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*/
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function createPreview($file, $maxX = 100, $maxY = 75, $scaleUp = false) {
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$preview = new \OC\Preview('', '/', $file, $maxX, $maxY, $scaleUp);
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return $preview->getPreview();
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}
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/**
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* returns true if the passed mime type is supported
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*
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* @param string $mimeType
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* @return boolean
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*/
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function isMimeSupported($mimeType = '*') {
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if (!\OC::$server->getConfig()->getSystemValue('enable_previews', true)) {
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return false;
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}
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$providerMimeTypes = array_keys($this->providers);
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foreach ($providerMimeTypes as $supportedMimeType) {
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if (preg_match($supportedMimeType, $mimeType)) {
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return true;
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}
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}
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return false;
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}
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/**
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* Check if a preview can be generated for a file
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*
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* @param \OCP\Files\FileInfo $file
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* @return bool
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*/
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function isAvailable($file) {
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if (!\OC::$server->getConfig()->getSystemValue('enable_previews', true)) {
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return false;
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}
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$mount = $file->getMountPoint();
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if ($mount and !$mount->getOption('previews', true)){
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return false;
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}
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foreach ($this->providers as $supportedMimeType => $providers) {
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if (preg_match($supportedMimeType, $file->getMimetype())) {
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foreach ($providers as $closure) {
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$provider = $closure();
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if (!($provider instanceof \OC\Preview\Provider)) {
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continue;
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}
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/** @var $provider \OC\Preview\Provider */
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if ($provider->isAvailable($file)) {
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return true;
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}
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}
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}
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}
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return false;
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}
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/** @var array */
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protected $defaultProviders;
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/**
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* List of enabled default providers
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*
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* The following providers are enabled by default:
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* - OC\Preview\Image
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* - OC\Preview\MP3
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* - OC\Preview\TXT
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* - OC\Preview\MarkDown
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*
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* The following providers are disabled by default due to performance or privacy concerns:
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* - OC\Preview\MSOfficeDoc
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* - OC\Preview\MSOffice2003
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* - OC\Preview\MSOffice2007
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* - OC\Preview\OpenDocument
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* - OC\Preview\StarOffice
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* - OC\Preview\SVG
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* - OC\Preview\Movie
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* - OC\Preview\PDF
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* - OC\Preview\TIFF
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* - OC\Preview\Illustrator
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* - OC\Preview\Postscript
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* - OC\Preview\Photoshop
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* - OC\Preview\Font
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*
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* @return array
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*/
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protected function getEnabledDefaultProvider() {
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if ($this->defaultProviders !== null) {
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return $this->defaultProviders;
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}
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$this->defaultProviders = \OC::$server->getConfig()->getSystemValue('enabledPreviewProviders', [
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'OC\Preview\Image',
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'OC\Preview\MP3',
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'OC\Preview\TXT',
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'OC\Preview\MarkDown',
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]);
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return $this->defaultProviders;
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}
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/**
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* Register the default providers (if enabled)
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*
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* @param string $class
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* @param string $mimeType
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*/
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protected function registerCoreProvider($class, $mimeType) {
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if (in_array(trim($class, '\\'), $this->getEnabledDefaultProvider())) {
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$this->registerProvider($mimeType, function () use ($class) {
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return new $class([]);
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});
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}
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}
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/**
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* Register the default providers (if enabled)
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*/
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protected function registerCoreProviders() {
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$this->registerCoreProvider('OC\Preview\TXT', '/text\/plain/');
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$this->registerCoreProvider('OC\Preview\MarkDown', '/text\/(x-)?markdown/');
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$this->registerCoreProvider('OC\Preview\Image', '/image\/(?!tiff$)(?!svg.*).*/');
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$this->registerCoreProvider('OC\Preview\MP3', '/audio\/mpeg/');
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// SVG, Office and Bitmap require imagick
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if (extension_loaded('imagick')) {
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$checkImagick = new \Imagick();
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$imagickProviders = [
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'SVG' => ['mimetype' => '/image\/svg\+xml/', 'class' => '\OC\Preview\SVG'],
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'TIFF' => ['mimetype' => '/image\/tiff/', 'class' => '\OC\Preview\TIFF'],
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'PDF' => ['mimetype' => '/application\/pdf/', 'class' => '\OC\Preview\PDF'],
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'AI' => ['mimetype' => '/application\/illustrator/', 'class' => '\OC\Preview\Illustrator'],
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'PSD' => ['mimetype' => '/application\/x-photoshop/', 'class' => '\OC\Preview\Photoshop'],
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'EPS' => ['mimetype' => '/application\/postscript/', 'class' => '\OC\Preview\Postscript'],
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'TTF' => ['mimetype' => '/application\/(?:font-sfnt|x-font$)/', 'class' => '\OC\Preview\Font'],
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];
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foreach ($imagickProviders as $queryFormat => $provider) {
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$class = $provider['class'];
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if (!in_array(trim($class, '\\'), $this->getEnabledDefaultProvider())) {
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continue;
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}
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if (count($checkImagick->queryFormats($queryFormat)) === 1) {
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$this->registerCoreProvider($class, $provider['mimetype']);
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}
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}
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if (count($checkImagick->queryFormats('PDF')) === 1) {
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// Office previews are currently not supported on Windows
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if (!\OC_Util::runningOnWindows() && \OC_Helper::is_function_enabled('shell_exec')) {
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$officeFound = is_string(\OC::$server->getConfig()->getSystemValue('preview_libreoffice_path', null));
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if (!$officeFound) {
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//let's see if there is libreoffice or openoffice on this machine
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$whichLibreOffice = shell_exec('command -v libreoffice');
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$officeFound = !empty($whichLibreOffice);
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if (!$officeFound) {
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$whichOpenOffice = shell_exec('command -v openoffice');
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$officeFound = !empty($whichOpenOffice);
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}
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}
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if ($officeFound) {
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$this->registerCoreProvider('\OC\Preview\MSOfficeDoc', '/application\/msword/');
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$this->registerCoreProvider('\OC\Preview\MSOffice2003', '/application\/vnd.ms-.*/');
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$this->registerCoreProvider('\OC\Preview\MSOffice2007', '/application\/vnd.openxmlformats-officedocument.*/');
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$this->registerCoreProvider('\OC\Preview\OpenDocument', '/application\/vnd.oasis.opendocument.*/');
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$this->registerCoreProvider('\OC\Preview\StarOffice', '/application\/vnd.sun.xml.*/');
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}
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}
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}
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}
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// Video requires avconv or ffmpeg and is therefor
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// currently not supported on Windows.
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if (in_array('OC\Preview\Movie', $this->getEnabledDefaultProvider()) && !\OC_Util::runningOnWindows()) {
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$avconvBinary = \OC_Helper::findBinaryPath('avconv');
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$ffmpegBinary = ($avconvBinary) ? null : \OC_Helper::findBinaryPath('ffmpeg');
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if ($avconvBinary || $ffmpegBinary) {
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// FIXME // a bit hacky but didn't want to use subclasses
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\OC\Preview\Movie::$avconvBinary = $avconvBinary;
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\OC\Preview\Movie::$ffmpegBinary = $ffmpegBinary;
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$this->registerCoreProvider('\OC\Preview\Movie', '/video\/.*/');
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}
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}
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}
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}
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