nextcloud/lib/private/previewmanager.php

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<?php
/**
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* @author Joas Schilling <nickvergessen@owncloud.com>
* @author Morris Jobke <hey@morrisjobke.de>
* @author Robin Appelman <icewind@owncloud.com>
* @author Thomas Müller <thomas.mueller@tmit.eu>
*
* @copyright Copyright (c) 2015, ownCloud, Inc.
* @license AGPL-3.0
*
* This code is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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, version 3,
* along with this program. If not, see <http://www.gnu.org/licenses/>
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*
*/
namespace OC;
use OCP\IPreview;
use OCP\Preview\IProvider;
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class PreviewManager implements IPreview {
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/** @var \OCP\IConfig */
protected $config;
/** @var bool */
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protected $providerListDirty = false;
/** @var bool */
protected $registeredCoreProviders = false;
/** @var array */
protected $providers = [];
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/** @var array mime type => support status */
protected $mimeTypeSupportMap = [];
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/** @var array */
protected $defaultProviders;
/**
* Constructor
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*
* @param \OCP\IConfig $config
*/
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public function __construct(\OCP\IConfig $config) {
$this->config = $config;
}
/**
* 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
*
* @param string $mimeTypeRegex Regex with the mime types that are supported by this provider
* @param \Closure $callable
* @return void
*/
public function registerProvider($mimeTypeRegex, \Closure $callable) {
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if (!$this->config->getSystemValue('enable_previews', true)) {
return;
}
if (!isset($this->providers[$mimeTypeRegex])) {
$this->providers[$mimeTypeRegex] = [];
}
$this->providers[$mimeTypeRegex][] = $callable;
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$this->providerListDirty = true;
}
/**
* Get all providers
* @return array
*/
public function getProviders() {
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if (!$this->config->getSystemValue('enable_previews', true)) {
return [];
}
$this->registerCoreProviders();
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if ($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);
}
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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
* @param int $maxX The maximum X size of the thumbnail. It can be smaller depending on the shape of the image
* @param int $maxY The maximum Y size of the thumbnail. It can be smaller depending on the shape of the image
* @param boolean $scaleUp Scale smaller images up to the thumbnail size or not. Might look ugly
* @return \OCP\IImage
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*/
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public function createPreview($file, $maxX = 100, $maxY = 75, $scaleUp = false) {
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$preview = new \OC\Preview('', '/', $file, $maxX, $maxY, $scaleUp);
return $preview->getPreview();
}
/**
* returns true if the passed mime type is supported
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*
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* @param string $mimeType
* @return boolean
*/
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public function isMimeSupported($mimeType = '*') {
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if (!$this->config->getSystemValue('enable_previews', true)) {
return false;
}
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if (isset($this->mimeTypeSupportMap[$mimeType])) {
return $this->mimeTypeSupportMap[$mimeType];
}
$this->registerCoreProviders();
$providerMimeTypes = array_keys($this->providers);
foreach ($providerMimeTypes as $supportedMimeType) {
if (preg_match($supportedMimeType, $mimeType)) {
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$this->mimeTypeSupportMap[$mimeType] = true;
return true;
}
}
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$this->mimeTypeSupportMap[$mimeType] = false;
return false;
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}
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/**
* Check if a preview can be generated for a file
*
* @param \OCP\Files\FileInfo $file
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* @return bool
*/
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public function isAvailable(\OCP\Files\FileInfo $file) {
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if (!$this->config->getSystemValue('enable_previews', true)) {
return false;
}
$this->registerCoreProviders();
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if (!$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 $closure) {
$provider = $closure();
if (!($provider instanceof IProvider)) {
continue;
}
/** @var $provider IProvider */
if ($provider->isAvailable($file)) {
return true;
}
}
}
}
return false;
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}
/**
* List of enabled default providers
*
* The following providers are enabled by default:
* - OC\Preview\Image
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* - OC\Preview\MarkDown
* - OC\Preview\MP3
* - OC\Preview\TXT
*
* The following providers are disabled by default due to performance or privacy concerns:
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* - OC\Preview\Font
* - OC\Preview\Illustrator
* - OC\Preview\Movie
* - OC\Preview\MSOfficeDoc
* - OC\Preview\MSOffice2003
* - OC\Preview\MSOffice2007
* - OC\Preview\OpenDocument
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* - OC\Preview\PDF
* - OC\Preview\Photoshop
* - OC\Preview\Postscript
* - OC\Preview\StarOffice
* - OC\Preview\SVG
* - OC\Preview\TIFF
*
* @return array
*/
protected function getEnabledDefaultProvider() {
if ($this->defaultProviders !== null) {
return $this->defaultProviders;
}
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$this->defaultProviders = $this->config->getSystemValue('enabledPreviewProviders', [
'OC\Preview\Image',
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'OC\Preview\MarkDown',
'OC\Preview\MP3',
'OC\Preview\TXT',
]);
return $this->defaultProviders;
}
/**
* Register the default providers (if enabled)
*
* @param string $class
* @param string $mimeType
*/
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protected function registerCoreProvider($class, $mimeType, $options = []) {
if (in_array(trim($class, '\\'), $this->getEnabledDefaultProvider())) {
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$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('OC\Preview\TXT', '/text\/plain/');
$this->registerCoreProvider('OC\Preview\MarkDown', '/text\/(x-)?markdown/');
$this->registerCoreProvider('OC\Preview\Image', '/image\/(?!tiff$)(?!svg.*).*/');
$this->registerCoreProvider('OC\Preview\MP3', '/audio\/mpeg/');
// SVG, Office and Bitmap require imagick
if (extension_loaded('imagick')) {
$checkImagick = new \Imagick();
$imagickProviders = [
'SVG' => ['mimetype' => '/image\/svg\+xml/', 'class' => '\OC\Preview\SVG'],
'TIFF' => ['mimetype' => '/image\/tiff/', 'class' => '\OC\Preview\TIFF'],
'PDF' => ['mimetype' => '/application\/pdf/', 'class' => '\OC\Preview\PDF'],
'AI' => ['mimetype' => '/application\/illustrator/', 'class' => '\OC\Preview\Illustrator'],
'PSD' => ['mimetype' => '/application\/x-photoshop/', 'class' => '\OC\Preview\Photoshop'],
'EPS' => ['mimetype' => '/application\/postscript/', 'class' => '\OC\Preview\Postscript'],
'TTF' => ['mimetype' => '/application\/(?:font-sfnt|x-font$)/', 'class' => '\OC\Preview\Font'],
];
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) {
// Office previews are currently not supported on Windows
if (!\OC_Util::runningOnWindows() && \OC_Helper::is_function_enabled('shell_exec')) {
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$officeFound = is_string($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('\OC\Preview\MSOfficeDoc', '/application\/msword/');
$this->registerCoreProvider('\OC\Preview\MSOffice2003', '/application\/vnd.ms-.*/');
$this->registerCoreProvider('\OC\Preview\MSOffice2007', '/application\/vnd.openxmlformats-officedocument.*/');
$this->registerCoreProvider('\OC\Preview\OpenDocument', '/application\/vnd.oasis.opendocument.*/');
$this->registerCoreProvider('\OC\Preview\StarOffice', '/application\/vnd.sun.xml.*/');
}
}
}
}
// Video requires avconv or ffmpeg and is therefor
// currently not supported on Windows.
if (in_array('OC\Preview\Movie', $this->getEnabledDefaultProvider()) && !\OC_Util::runningOnWindows()) {
$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('\OC\Preview\Movie', '/video\/.*/');
}
}
}
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}