495 lines
14 KiB
PHP
495 lines
14 KiB
PHP
<?php
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/**
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* @copyright Copyright (c) 2016, Roeland Jago Douma <roeland@famdouma.nl>
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*
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* @author Christoph Wurst <christoph@winzerhof-wurst.at>
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* @author Elijah Martin-Merrill <elijah@nyp-itsours.com>
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* @author John Molakvoæ (skjnldsv) <skjnldsv@protonmail.com>
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* @author Morris Jobke <hey@morrisjobke.de>
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* @author Robin Appelman <robin@icewind.nl>
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* @author Roeland Jago Douma <roeland@famdouma.nl>
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* @author Scott Dutton <scott@exussum.co.uk>
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*
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* @license GNU AGPL version 3 or any later version
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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namespace OC\Preview;
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use OCP\Files\File;
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use OCP\Files\IAppData;
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use OCP\Files\NotFoundException;
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use OCP\Files\NotPermittedException;
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use OCP\Files\SimpleFS\ISimpleFile;
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use OCP\Files\SimpleFS\ISimpleFolder;
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use OCP\IConfig;
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use OCP\IImage;
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use OCP\IPreview;
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use OCP\Preview\IProviderV2;
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use OCP\Preview\IVersionedPreviewFile;
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use Symfony\Component\EventDispatcher\EventDispatcherInterface;
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use Symfony\Component\EventDispatcher\GenericEvent;
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class Generator {
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/** @var IPreview */
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private $previewManager;
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/** @var IConfig */
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private $config;
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/** @var IAppData */
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private $appData;
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/** @var GeneratorHelper */
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private $helper;
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/** @var EventDispatcherInterface */
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private $eventDispatcher;
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/**
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* @param IConfig $config
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* @param IPreview $previewManager
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* @param IAppData $appData
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* @param GeneratorHelper $helper
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* @param EventDispatcherInterface $eventDispatcher
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*/
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public function __construct(
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IConfig $config,
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IPreview $previewManager,
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IAppData $appData,
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GeneratorHelper $helper,
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EventDispatcherInterface $eventDispatcher
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) {
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$this->config = $config;
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$this->previewManager = $previewManager;
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$this->appData = $appData;
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$this->helper = $helper;
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$this->eventDispatcher = $eventDispatcher;
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}
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/**
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* Returns a preview of a file
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*
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* The cache is searched first and if nothing usable was found then a preview is
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* generated by one of the providers
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*
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* @param File $file
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* @param int $width
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* @param int $height
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* @param bool $crop
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* @param string $mode
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* @param string $mimeType
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* @return ISimpleFile
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* @throws NotFoundException
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* @throws \InvalidArgumentException if the preview would be invalid (in case the original image is invalid)
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*/
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public function getPreview(File $file, $width = -1, $height = -1, $crop = false, $mode = IPreview::MODE_FILL, $mimeType = null) {
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$specification = [
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'width' => $width,
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'height' => $height,
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'crop' => $crop,
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'mode' => $mode,
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];
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$this->eventDispatcher->dispatch(
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IPreview::EVENT,
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new GenericEvent($file, $specification)
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);
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// since we only ask for one preview, and the generate method return the last one it created, it returns the one we want
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return $this->generatePreviews($file, [$specification], $mimeType);
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}
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/**
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* Generates previews of a file
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*
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* @param File $file
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* @param array $specifications
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* @param string $mimeType
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* @return ISimpleFile the last preview that was generated
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* @throws NotFoundException
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* @throws \InvalidArgumentException if the preview would be invalid (in case the original image is invalid)
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*/
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public function generatePreviews(File $file, array $specifications, $mimeType = null) {
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//Make sure that we can read the file
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if (!$file->isReadable()) {
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throw new NotFoundException('Cannot read file');
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}
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if ($mimeType === null) {
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$mimeType = $file->getMimeType();
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}
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$previewFolder = $this->getPreviewFolder($file);
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$previewVersion = '';
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if ($file instanceof IVersionedPreviewFile) {
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$previewVersion = $file->getPreviewVersion() . '-';
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}
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// Get the max preview and infer the max preview sizes from that
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$maxPreview = $this->getMaxPreview($previewFolder, $file, $mimeType, $previewVersion);
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$maxPreviewImage = null; // only load the image when we need it
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if ($maxPreview->getSize() === 0) {
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$maxPreview->delete();
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throw new NotFoundException('Max preview size 0, invalid!');
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}
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[$maxWidth, $maxHeight] = $this->getPreviewSize($maxPreview, $previewVersion);
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$preview = null;
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foreach ($specifications as $specification) {
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$width = $specification['width'] ?? -1;
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$height = $specification['height'] ?? -1;
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$crop = $specification['crop'] ?? false;
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$mode = $specification['mode'] ?? IPreview::MODE_FILL;
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// If both width and height are -1 we just want the max preview
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if ($width === -1 && $height === -1) {
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$width = $maxWidth;
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$height = $maxHeight;
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}
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// Calculate the preview size
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[$width, $height] = $this->calculateSize($width, $height, $crop, $mode, $maxWidth, $maxHeight);
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// No need to generate a preview that is just the max preview
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if ($width === $maxWidth && $height === $maxHeight) {
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// ensure correct return value if this was the last one
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$preview = $maxPreview;
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continue;
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}
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// Try to get a cached preview. Else generate (and store) one
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try {
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try {
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$preview = $this->getCachedPreview($previewFolder, $width, $height, $crop, $maxPreview->getMimeType(), $previewVersion);
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} catch (NotFoundException $e) {
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if (!$this->previewManager->isMimeSupported($mimeType)) {
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throw new NotFoundException();
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}
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if ($maxPreviewImage === null) {
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$maxPreviewImage = $this->helper->getImage($maxPreview);
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}
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$preview = $this->generatePreview($previewFolder, $maxPreviewImage, $width, $height, $crop, $maxWidth, $maxHeight, $previewVersion);
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}
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} catch (\InvalidArgumentException $e) {
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throw new NotFoundException("", 0, $e);
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}
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if ($preview->getSize() === 0) {
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$preview->delete();
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throw new NotFoundException('Cached preview size 0, invalid!');
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}
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}
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// Free memory being used by the embedded image resource. Without this the image is kept in memory indefinitely.
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// Garbage Collection does NOT free this memory. We have to do it ourselves.
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if ($maxPreviewImage instanceof \OC_Image) {
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$maxPreviewImage->destroy();
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}
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return $preview;
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}
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/**
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* @param ISimpleFolder $previewFolder
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* @param File $file
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* @param string $mimeType
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* @param string $prefix
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* @return ISimpleFile
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* @throws NotFoundException
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*/
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private function getMaxPreview(ISimpleFolder $previewFolder, File $file, $mimeType, $prefix) {
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$nodes = $previewFolder->getDirectoryListing();
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foreach ($nodes as $node) {
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$name = $node->getName();
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if (($prefix === '' || strpos($name, $prefix) === 0) && strpos($name, 'max')) {
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return $node;
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}
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}
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$previewProviders = $this->previewManager->getProviders();
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foreach ($previewProviders as $supportedMimeType => $providers) {
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if (!preg_match($supportedMimeType, $mimeType)) {
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continue;
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}
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foreach ($providers as $providerClosure) {
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$provider = $this->helper->getProvider($providerClosure);
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if (!($provider instanceof IProviderV2)) {
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continue;
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}
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if (!$provider->isAvailable($file)) {
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continue;
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}
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$maxWidth = (int)$this->config->getSystemValue('preview_max_x', 4096);
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$maxHeight = (int)$this->config->getSystemValue('preview_max_y', 4096);
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$preview = $this->helper->getThumbnail($provider, $file, $maxWidth, $maxHeight);
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if (!($preview instanceof IImage)) {
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continue;
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}
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// Try to get the extention.
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try {
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$ext = $this->getExtention($preview->dataMimeType());
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} catch (\InvalidArgumentException $e) {
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// Just continue to the next iteration if this preview doesn't have a valid mimetype
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continue;
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}
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$path = $prefix . (string)$preview->width() . '-' . (string)$preview->height() . '-max.' . $ext;
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try {
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$file = $previewFolder->newFile($path);
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$file->putContent($preview->data());
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} catch (NotPermittedException $e) {
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throw new NotFoundException();
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}
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return $file;
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}
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}
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throw new NotFoundException();
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}
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/**
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* @param ISimpleFile $file
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* @param string $prefix
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* @return int[]
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*/
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private function getPreviewSize(ISimpleFile $file, string $prefix = '') {
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$size = explode('-', substr($file->getName(), strlen($prefix)));
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return [(int)$size[0], (int)$size[1]];
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}
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/**
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* @param int $width
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* @param int $height
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* @param bool $crop
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* @param string $mimeType
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* @param string $prefix
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* @return string
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*/
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private function generatePath($width, $height, $crop, $mimeType, $prefix) {
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$path = $prefix . (string)$width . '-' . (string)$height;
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if ($crop) {
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$path .= '-crop';
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}
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$ext = $this->getExtention($mimeType);
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$path .= '.' . $ext;
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return $path;
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}
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/**
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* @param int $width
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* @param int $height
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* @param bool $crop
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* @param string $mode
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* @param int $maxWidth
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* @param int $maxHeight
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* @return int[]
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*/
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private function calculateSize($width, $height, $crop, $mode, $maxWidth, $maxHeight) {
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/*
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* If we are not cropping we have to make sure the requested image
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* respects the aspect ratio of the original.
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*/
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if (!$crop) {
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$ratio = $maxHeight / $maxWidth;
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if ($width === -1) {
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$width = $height / $ratio;
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}
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if ($height === -1) {
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$height = $width * $ratio;
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}
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$ratioH = $height / $maxHeight;
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$ratioW = $width / $maxWidth;
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/*
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* Fill means that the $height and $width are the max
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* Cover means min.
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*/
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if ($mode === IPreview::MODE_FILL) {
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if ($ratioH > $ratioW) {
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$height = $width * $ratio;
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} else {
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$width = $height / $ratio;
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}
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} elseif ($mode === IPreview::MODE_COVER) {
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if ($ratioH > $ratioW) {
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$width = $height / $ratio;
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} else {
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$height = $width * $ratio;
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}
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}
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}
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if ($height !== $maxHeight && $width !== $maxWidth) {
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/*
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* Scale to the nearest power of four
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*/
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$pow4height = 4 ** ceil(log($height) / log(4));
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$pow4width = 4 ** ceil(log($width) / log(4));
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// Minimum size is 64
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$pow4height = max($pow4height, 64);
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$pow4width = max($pow4width, 64);
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$ratioH = $height / $pow4height;
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$ratioW = $width / $pow4width;
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if ($ratioH < $ratioW) {
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$width = $pow4width;
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$height /= $ratioW;
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} else {
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$height = $pow4height;
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$width /= $ratioH;
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}
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}
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/*
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* Make sure the requested height and width fall within the max
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* of the preview.
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*/
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if ($height > $maxHeight) {
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$ratio = $height / $maxHeight;
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$height = $maxHeight;
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$width /= $ratio;
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}
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if ($width > $maxWidth) {
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$ratio = $width / $maxWidth;
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$width = $maxWidth;
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$height /= $ratio;
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}
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return [(int)round($width), (int)round($height)];
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}
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/**
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* @param ISimpleFolder $previewFolder
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* @param ISimpleFile $maxPreview
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* @param int $width
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* @param int $height
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* @param bool $crop
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* @param int $maxWidth
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* @param int $maxHeight
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* @param string $prefix
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* @return ISimpleFile
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* @throws NotFoundException
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* @throws \InvalidArgumentException if the preview would be invalid (in case the original image is invalid)
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*/
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private function generatePreview(ISimpleFolder $previewFolder, IImage $maxPreview, $width, $height, $crop, $maxWidth, $maxHeight, $prefix) {
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$preview = $maxPreview;
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if (!$preview->valid()) {
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throw new \InvalidArgumentException('Failed to generate preview, failed to load image');
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}
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if ($crop) {
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if ($height !== $preview->height() && $width !== $preview->width()) {
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//Resize
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$widthR = $preview->width() / $width;
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$heightR = $preview->height() / $height;
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if ($widthR > $heightR) {
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$scaleH = $height;
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$scaleW = $maxWidth / $heightR;
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} else {
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$scaleH = $maxHeight / $widthR;
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$scaleW = $width;
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}
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$preview = $preview->preciseResizeCopy((int)round($scaleW), (int)round($scaleH));
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}
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$cropX = (int)floor(abs($width - $preview->width()) * 0.5);
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$cropY = (int)floor(abs($height - $preview->height()) * 0.5);
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$preview = $preview->cropCopy($cropX, $cropY, $width, $height);
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} else {
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$preview = $maxPreview->resizeCopy(max($width, $height));
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}
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$path = $this->generatePath($width, $height, $crop, $preview->dataMimeType(), $prefix);
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try {
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$file = $previewFolder->newFile($path);
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$file->putContent($preview->data());
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} catch (NotPermittedException $e) {
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throw new NotFoundException();
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}
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return $file;
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}
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/**
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* @param ISimpleFolder $previewFolder
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* @param int $width
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* @param int $height
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* @param bool $crop
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* @param string $mimeType
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* @param string $prefix
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* @return ISimpleFile
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*
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* @throws NotFoundException
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*/
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private function getCachedPreview(ISimpleFolder $previewFolder, $width, $height, $crop, $mimeType, $prefix) {
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$path = $this->generatePath($width, $height, $crop, $mimeType, $prefix);
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return $previewFolder->getFile($path);
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}
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/**
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* Get the specific preview folder for this file
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*
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* @param File $file
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* @return ISimpleFolder
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*/
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private function getPreviewFolder(File $file) {
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try {
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$folder = $this->appData->getFolder($file->getId());
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} catch (NotFoundException $e) {
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$folder = $this->appData->newFolder($file->getId());
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}
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return $folder;
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}
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/**
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* @param string $mimeType
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* @return null|string
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* @throws \InvalidArgumentException
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*/
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private function getExtention($mimeType) {
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switch ($mimeType) {
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case 'image/png':
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return 'png';
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case 'image/jpeg':
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return 'jpg';
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case 'image/gif':
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return 'gif';
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default:
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throw new \InvalidArgumentException('Not a valid mimetype: "' . $mimeType . '"');
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}
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}
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}
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