2016-08-04 20:41:04 +03:00
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<?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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2017-11-06 17:56:42 +03:00
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* @author Morris Jobke <hey@morrisjobke.de>
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* @author Robin Appelman <robin@icewind.nl>
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2016-08-04 20:41:04 +03:00
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* @author Roeland Jago Douma <roeland@famdouma.nl>
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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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2016-10-14 22:21:37 +03:00
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namespace OC\Preview;
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2016-08-04 20:41:04 +03:00
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use OCP\Files\File;
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2016-10-07 15:16:38 +03:00
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use OCP\Files\IAppData;
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2016-08-04 20:41:04 +03:00
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use OCP\Files\NotFoundException;
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2017-03-19 22:30:46 +03:00
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use OCP\Files\NotPermittedException;
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2016-10-07 15:16:38 +03:00
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use OCP\Files\SimpleFS\ISimpleFile;
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use OCP\Files\SimpleFS\ISimpleFolder;
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2016-08-04 20:41:04 +03:00
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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\IProvider;
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2016-11-10 16:04:59 +03:00
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use Symfony\Component\EventDispatcher\EventDispatcherInterface;
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use Symfony\Component\EventDispatcher\GenericEvent;
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2016-08-04 20:41:04 +03:00
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2016-10-14 22:21:37 +03:00
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class Generator {
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2016-08-04 20:41:04 +03:00
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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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2016-10-07 15:16:38 +03:00
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/** @var IAppData */
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private $appData;
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2016-10-17 22:53:23 +03:00
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/** @var GeneratorHelper */
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private $helper;
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2016-11-10 16:04:59 +03:00
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/** @var EventDispatcherInterface */
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private $eventDispatcher;
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2016-08-04 20:41:04 +03:00
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2016-10-14 20:27:14 +03:00
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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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2016-10-17 22:53:23 +03:00
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* @param GeneratorHelper $helper
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2016-11-10 16:04:59 +03:00
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* @param EventDispatcherInterface $eventDispatcher
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2016-10-14 20:27:14 +03:00
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*/
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2016-08-04 20:41:04 +03:00
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public function __construct(
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IConfig $config,
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IPreview $previewManager,
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2016-10-17 22:53:23 +03:00
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IAppData $appData,
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2016-11-10 16:04:59 +03:00
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GeneratorHelper $helper,
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EventDispatcherInterface $eventDispatcher
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2016-08-04 20:41:04 +03:00
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) {
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$this->config = $config;
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$this->previewManager = $previewManager;
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2016-10-07 15:16:38 +03:00
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$this->appData = $appData;
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2016-10-17 22:53:23 +03:00
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$this->helper = $helper;
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2016-11-10 16:04:59 +03:00
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$this->eventDispatcher = $eventDispatcher;
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2016-08-04 20:41:04 +03:00
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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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2016-10-16 17:48:11 +03:00
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* @param File $file
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2016-08-04 20:41:04 +03:00
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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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2016-10-16 21:42:35 +03:00
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* @param string $mimeType
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2016-10-07 15:16:38 +03:00
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* @return ISimpleFile
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2016-08-04 20:41:04 +03:00
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* @throws NotFoundException
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2017-05-02 00:35:47 +03:00
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* @throws \InvalidArgumentException if the preview would be invalid (in case the original image is invalid)
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2016-08-04 20:41:04 +03:00
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*/
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2016-10-16 21:42:35 +03:00
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public function getPreview(File $file, $width = -1, $height = -1, $crop = false, $mode = IPreview::MODE_FILL, $mimeType = null) {
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2018-05-29 22:09:08 +03:00
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//Make sure that we can read the file
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if (!$file->isReadable()) {
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throw new NotFoundException('Cannot read file');
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}
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2016-11-10 16:04:59 +03:00
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$this->eventDispatcher->dispatch(
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IPreview::EVENT,
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new GenericEvent($file,[
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'width' => $width,
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'height' => $height,
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'crop' => $crop,
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'mode' => $mode
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])
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);
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2016-10-16 21:42:35 +03:00
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if ($mimeType === null) {
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$mimeType = $file->getMimeType();
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}
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if (!$this->previewManager->isMimeSupported($mimeType)) {
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2016-08-04 20:41:04 +03:00
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throw new NotFoundException();
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}
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2016-10-16 17:48:11 +03:00
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$previewFolder = $this->getPreviewFolder($file);
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2016-08-04 20:41:04 +03:00
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// Get the max preview and infer the max preview sizes from that
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2016-10-16 21:42:35 +03:00
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$maxPreview = $this->getMaxPreview($previewFolder, $file, $mimeType);
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2018-01-22 15:57:00 +03:00
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if ($maxPreview->getSize() === 0) {
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$maxPreview->delete();
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throw new NotFoundException('Max preview size 0, invalid!');
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}
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2016-08-04 20:41:04 +03:00
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list($maxWidth, $maxHeight) = $this->getPreviewSize($maxPreview);
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2017-09-21 12:32:22 +03:00
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// If both width and heigth 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 = $maxHeight;
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}
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2016-08-04 20:41:04 +03:00
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// Calculate the preview size
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list($width, $height) = $this->calculateSize($width, $height, $crop, $mode, $maxWidth, $maxHeight);
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2017-03-19 22:23:23 +03:00
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// No need to generate a preview that is just the max preview
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if ($width === $maxWidth && $height === $maxHeight) {
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return $maxPreview;
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}
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2016-08-04 20:41:04 +03:00
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// Try to get a cached preview. Else generate (and store) one
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try {
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2018-01-07 13:46:24 +03:00
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try {
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2018-01-22 15:57:00 +03:00
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$preview = $this->getCachedPreview($previewFolder, $width, $height, $crop, $maxPreview->getMimeType());
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2018-01-07 13:46:24 +03:00
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} catch (NotFoundException $e) {
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2018-01-22 15:57:00 +03:00
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$preview = $this->generatePreview($previewFolder, $maxPreview, $width, $height, $crop, $maxWidth, $maxHeight);
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2018-01-07 13:46:24 +03:00
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}
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} catch (\InvalidArgumentException $e) {
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throw new NotFoundException();
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2016-08-04 20:41:04 +03:00
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}
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2018-01-22 15:57:00 +03:00
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if ($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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return $preview;
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2016-08-04 20:41:04 +03:00
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}
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/**
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2016-10-07 15:16:38 +03:00
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* @param ISimpleFolder $previewFolder
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2016-10-16 17:48:11 +03:00
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* @param File $file
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2016-10-16 21:42:35 +03:00
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* @param string $mimeType
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2016-10-07 15:16:38 +03:00
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* @return ISimpleFile
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2016-08-04 20:41:04 +03:00
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* @throws NotFoundException
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*/
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2016-10-16 21:42:35 +03:00
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private function getMaxPreview(ISimpleFolder $previewFolder, File $file, $mimeType) {
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2016-08-04 20:41:04 +03:00
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$nodes = $previewFolder->getDirectoryListing();
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foreach ($nodes as $node) {
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if (strpos($node->getName(), '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 => $providers) {
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2016-10-16 21:42:35 +03:00
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if (!preg_match($supportedMimeType, $mimeType)) {
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2016-08-04 20:41:04 +03:00
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continue;
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}
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foreach ($providers as $provider) {
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2016-10-17 22:53:23 +03:00
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$provider = $this->helper->getProvider($provider);
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2016-08-04 20:41:04 +03:00
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if (!($provider instanceof IProvider)) {
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continue;
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}
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2018-08-16 11:45:51 +03:00
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if (!$provider->isAvailable($file)) {
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continue;
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}
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2018-01-08 13:39:09 +03:00
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$maxWidth = (int)$this->config->getSystemValue('preview_max_x', 4096);
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$maxHeight = (int)$this->config->getSystemValue('preview_max_y', 4096);
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2016-08-04 20:41:04 +03:00
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2016-10-17 22:53:23 +03:00
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$preview = $this->helper->getThumbnail($provider, $file, $maxWidth, $maxHeight);
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2016-08-04 20:41:04 +03:00
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if (!($preview instanceof IImage)) {
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continue;
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}
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2018-01-07 13:46:24 +03:00
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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 $e) {
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// Just continue to the next iteration if this preview doesn't have a valid mimetype
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continue;
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}
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2018-01-04 12:00:07 +03:00
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$path = (string)$preview->width() . '-' . (string)$preview->height() . '-max.' . $ext;
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2017-03-19 22:30:46 +03:00
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try {
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$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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2016-08-04 20:41:04 +03:00
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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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2016-10-07 15:16:38 +03:00
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* @param ISimpleFile $file
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2016-08-04 20:41:04 +03:00
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* @return int[]
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*/
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2016-10-07 15:16:38 +03:00
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private function getPreviewSize(ISimpleFile $file) {
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2016-08-04 20:41:04 +03:00
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$size = explode('-', $file->getName());
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return [(int)$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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2018-01-04 12:00:07 +03:00
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* @param string $mimeType
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2016-08-04 20:41:04 +03:00
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* @return string
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*/
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2018-01-04 12:00:07 +03:00
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private function generatePath($width, $height, $crop, $mimeType) {
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2017-03-19 22:30:46 +03:00
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$path = (string)$width . '-' . (string)$height;
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2016-08-04 20:41:04 +03:00
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if ($crop) {
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$path .= '-crop';
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}
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2018-01-04 12:00:07 +03:00
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$ext = $this->getExtention($mimeType);
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$path .= '.' . $ext;
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2016-08-04 20:41:04 +03:00
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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 $width are the max
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* Cover means min.
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*/
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2016-10-16 17:48:11 +03:00
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if ($mode === IPreview::MODE_FILL) {
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2016-08-04 20:41:04 +03:00
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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 / $ratio;
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}
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2016-10-16 17:48:11 +03:00
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} else if ($mode === IPreview::MODE_COVER) {
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2016-08-04 20:41:04 +03:00
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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 !== $maxWidth) {
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/*
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* Scale to the nearest power of two
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*/
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2017-03-19 22:30:46 +03:00
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$pow2height = 2 ** ceil(log($height) / log(2));
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$pow2width = 2 ** ceil(log($width) / log(2));
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2016-08-04 20:41:04 +03:00
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$ratioH = $height / $pow2height;
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$ratioW = $width / $pow2width;
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if ($ratioH < $ratioW) {
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$width = $pow2width;
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2017-03-19 22:30:46 +03:00
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$height /= $ratioW;
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2016-08-04 20:41:04 +03:00
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} else {
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$height = $pow2height;
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2017-03-19 22:30:46 +03:00
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$width /= $ratioH;
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2016-08-04 20:41:04 +03:00
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}
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}
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/*
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* Make sure the requested height and width fall within the max
|
|
|
|
* of the preview.
|
|
|
|
*/
|
|
|
|
if ($height > $maxHeight) {
|
|
|
|
$ratio = $height / $maxHeight;
|
|
|
|
$height = $maxHeight;
|
2017-03-19 22:30:46 +03:00
|
|
|
$width /= $ratio;
|
2016-08-04 20:41:04 +03:00
|
|
|
}
|
|
|
|
if ($width > $maxWidth) {
|
|
|
|
$ratio = $width / $maxWidth;
|
|
|
|
$width = $maxWidth;
|
2017-03-19 22:30:46 +03:00
|
|
|
$height /= $ratio;
|
2016-08-04 20:41:04 +03:00
|
|
|
}
|
|
|
|
|
|
|
|
return [(int)round($width), (int)round($height)];
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
2016-10-07 15:16:38 +03:00
|
|
|
* @param ISimpleFolder $previewFolder
|
|
|
|
* @param ISimpleFile $maxPreview
|
2016-08-04 20:41:04 +03:00
|
|
|
* @param int $width
|
|
|
|
* @param int $height
|
|
|
|
* @param bool $crop
|
2016-10-16 16:47:30 +03:00
|
|
|
* @param int $maxWidth
|
2016-08-04 20:41:04 +03:00
|
|
|
* @param int $maxHeight
|
2016-10-07 15:16:38 +03:00
|
|
|
* @return ISimpleFile
|
2016-08-04 20:41:04 +03:00
|
|
|
* @throws NotFoundException
|
2017-05-02 00:35:47 +03:00
|
|
|
* @throws \InvalidArgumentException if the preview would be invalid (in case the original image is invalid)
|
2016-08-04 20:41:04 +03:00
|
|
|
*/
|
2016-10-07 15:16:38 +03:00
|
|
|
private function generatePreview(ISimpleFolder $previewFolder, ISimpleFile $maxPreview, $width, $height, $crop, $maxWidth, $maxHeight) {
|
2016-10-17 22:53:23 +03:00
|
|
|
$preview = $this->helper->getImage($maxPreview);
|
2016-08-04 20:41:04 +03:00
|
|
|
|
2017-05-01 15:03:00 +03:00
|
|
|
if (!$preview->valid()) {
|
|
|
|
throw new \InvalidArgumentException('Failed to generate preview, failed to load image');
|
|
|
|
}
|
|
|
|
|
2016-08-04 20:41:04 +03:00
|
|
|
if ($crop) {
|
|
|
|
if ($height !== $preview->height() && $width !== $preview->width()) {
|
|
|
|
//Resize
|
|
|
|
$widthR = $preview->width() / $width;
|
|
|
|
$heightR = $preview->height() / $height;
|
|
|
|
|
|
|
|
if ($widthR > $heightR) {
|
|
|
|
$scaleH = $height;
|
|
|
|
$scaleW = $maxWidth / $heightR;
|
|
|
|
} else {
|
|
|
|
$scaleH = $maxHeight / $widthR;
|
|
|
|
$scaleW = $width;
|
|
|
|
}
|
2018-01-13 02:34:28 +03:00
|
|
|
$preview->preciseResize((int)round($scaleW), (int)round($scaleH));
|
2016-08-04 20:41:04 +03:00
|
|
|
}
|
2018-01-13 02:34:28 +03:00
|
|
|
$cropX = (int)floor(abs($width - $preview->width()) * 0.5);
|
2016-08-04 20:41:04 +03:00
|
|
|
$cropY = 0;
|
|
|
|
$preview->crop($cropX, $cropY, $width, $height);
|
|
|
|
} else {
|
|
|
|
$preview->resize(max($width, $height));
|
|
|
|
}
|
|
|
|
|
2017-05-01 15:03:00 +03:00
|
|
|
|
2018-01-04 12:00:07 +03:00
|
|
|
$path = $this->generatePath($width, $height, $crop, $preview->dataMimeType());
|
2017-03-19 22:30:46 +03:00
|
|
|
try {
|
|
|
|
$file = $previewFolder->newFile($path);
|
|
|
|
$file->putContent($preview->data());
|
|
|
|
} catch (NotPermittedException $e) {
|
|
|
|
throw new NotFoundException();
|
|
|
|
}
|
2016-08-04 20:41:04 +03:00
|
|
|
|
|
|
|
return $file;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
2016-10-07 15:16:38 +03:00
|
|
|
* @param ISimpleFolder $previewFolder
|
2016-08-04 20:41:04 +03:00
|
|
|
* @param int $width
|
|
|
|
* @param int $height
|
|
|
|
* @param bool $crop
|
2018-01-04 12:00:07 +03:00
|
|
|
* @param string $mimeType
|
2016-10-07 15:16:38 +03:00
|
|
|
* @return ISimpleFile
|
2016-08-04 20:41:04 +03:00
|
|
|
*
|
|
|
|
* @throws NotFoundException
|
|
|
|
*/
|
2018-01-04 12:00:07 +03:00
|
|
|
private function getCachedPreview(ISimpleFolder $previewFolder, $width, $height, $crop, $mimeType) {
|
|
|
|
$path = $this->generatePath($width, $height, $crop, $mimeType);
|
2016-08-04 20:41:04 +03:00
|
|
|
|
2016-10-07 15:16:38 +03:00
|
|
|
return $previewFolder->getFile($path);
|
2016-08-04 20:41:04 +03:00
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Get the specific preview folder for this file
|
|
|
|
*
|
2016-10-16 17:48:11 +03:00
|
|
|
* @param File $file
|
2016-10-07 15:16:38 +03:00
|
|
|
* @return ISimpleFolder
|
2016-08-04 20:41:04 +03:00
|
|
|
*/
|
2016-10-16 17:48:11 +03:00
|
|
|
private function getPreviewFolder(File $file) {
|
2016-08-04 20:41:04 +03:00
|
|
|
try {
|
2016-10-16 17:48:11 +03:00
|
|
|
$folder = $this->appData->getFolder($file->getId());
|
2016-08-04 20:41:04 +03:00
|
|
|
} catch (NotFoundException $e) {
|
2016-10-16 17:48:11 +03:00
|
|
|
$folder = $this->appData->newFolder($file->getId());
|
2016-08-04 20:41:04 +03:00
|
|
|
}
|
|
|
|
|
2016-10-07 15:16:38 +03:00
|
|
|
return $folder;
|
2016-08-04 20:41:04 +03:00
|
|
|
}
|
2018-01-04 12:00:07 +03:00
|
|
|
|
|
|
|
/**
|
|
|
|
* @param string $mimeType
|
|
|
|
* @return null|string
|
2018-01-07 13:46:24 +03:00
|
|
|
* @throws \InvalidArgumentException
|
2018-01-04 12:00:07 +03:00
|
|
|
*/
|
|
|
|
private function getExtention($mimeType) {
|
|
|
|
switch ($mimeType) {
|
|
|
|
case 'image/png':
|
|
|
|
return 'png';
|
|
|
|
case 'image/jpeg':
|
|
|
|
return 'jpg';
|
|
|
|
case 'image/gif':
|
|
|
|
return 'gif';
|
|
|
|
default:
|
2018-01-07 13:46:24 +03:00
|
|
|
throw new \InvalidArgumentException('Not a valid mimetype');
|
2018-01-04 12:00:07 +03:00
|
|
|
}
|
|
|
|
}
|
2016-08-04 20:41:04 +03:00
|
|
|
}
|