419 lines
11 KiB
PHP
419 lines
11 KiB
PHP
<?php
|
|
/**
|
|
* @copyright Copyright (c) 2016, Roeland Jago Douma <roeland@famdouma.nl>
|
|
*
|
|
* @author Morris Jobke <hey@morrisjobke.de>
|
|
* @author Robin Appelman <robin@icewind.nl>
|
|
* @author Roeland Jago Douma <roeland@famdouma.nl>
|
|
*
|
|
* @license GNU AGPL version 3 or any later version
|
|
*
|
|
* This program is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU Affero General Public License as
|
|
* published by the Free Software Foundation, either version 3 of the
|
|
* License, or (at your option) any later version.
|
|
*
|
|
* 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
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*
|
|
*/
|
|
|
|
namespace OC\Preview;
|
|
|
|
use OCP\Files\File;
|
|
use OCP\Files\IAppData;
|
|
use OCP\Files\NotFoundException;
|
|
use OCP\Files\NotPermittedException;
|
|
use OCP\Files\SimpleFS\ISimpleFile;
|
|
use OCP\Files\SimpleFS\ISimpleFolder;
|
|
use OCP\IConfig;
|
|
use OCP\IImage;
|
|
use OCP\IPreview;
|
|
use OCP\Preview\IProvider;
|
|
use Symfony\Component\EventDispatcher\EventDispatcherInterface;
|
|
use Symfony\Component\EventDispatcher\GenericEvent;
|
|
|
|
class Generator {
|
|
|
|
/** @var IPreview */
|
|
private $previewManager;
|
|
/** @var IConfig */
|
|
private $config;
|
|
/** @var IAppData */
|
|
private $appData;
|
|
/** @var GeneratorHelper */
|
|
private $helper;
|
|
/** @var EventDispatcherInterface */
|
|
private $eventDispatcher;
|
|
|
|
/**
|
|
* @param IConfig $config
|
|
* @param IPreview $previewManager
|
|
* @param IAppData $appData
|
|
* @param GeneratorHelper $helper
|
|
* @param EventDispatcherInterface $eventDispatcher
|
|
*/
|
|
public function __construct(
|
|
IConfig $config,
|
|
IPreview $previewManager,
|
|
IAppData $appData,
|
|
GeneratorHelper $helper,
|
|
EventDispatcherInterface $eventDispatcher
|
|
) {
|
|
$this->config = $config;
|
|
$this->previewManager = $previewManager;
|
|
$this->appData = $appData;
|
|
$this->helper = $helper;
|
|
$this->eventDispatcher = $eventDispatcher;
|
|
}
|
|
|
|
/**
|
|
* Returns a preview of a file
|
|
*
|
|
* The cache is searched first and if nothing usable was found then a preview is
|
|
* generated by one of the providers
|
|
*
|
|
* @param File $file
|
|
* @param int $width
|
|
* @param int $height
|
|
* @param bool $crop
|
|
* @param string $mode
|
|
* @param string $mimeType
|
|
* @return ISimpleFile
|
|
* @throws NotFoundException
|
|
* @throws \InvalidArgumentException if the preview would be invalid (in case the original image is invalid)
|
|
*/
|
|
public function getPreview(File $file, $width = -1, $height = -1, $crop = false, $mode = IPreview::MODE_FILL, $mimeType = null) {
|
|
$this->eventDispatcher->dispatch(
|
|
IPreview::EVENT,
|
|
new GenericEvent($file,[
|
|
'width' => $width,
|
|
'height' => $height,
|
|
'crop' => $crop,
|
|
'mode' => $mode
|
|
])
|
|
);
|
|
|
|
if ($mimeType === null) {
|
|
$mimeType = $file->getMimeType();
|
|
}
|
|
if (!$this->previewManager->isMimeSupported($mimeType)) {
|
|
throw new NotFoundException();
|
|
}
|
|
|
|
$previewFolder = $this->getPreviewFolder($file);
|
|
|
|
// Get the max preview and infer the max preview sizes from that
|
|
$maxPreview = $this->getMaxPreview($previewFolder, $file, $mimeType);
|
|
list($maxWidth, $maxHeight) = $this->getPreviewSize($maxPreview);
|
|
|
|
// If both width and heigth are -1 we just want the max preview
|
|
if ($width === -1 && $height === -1) {
|
|
$width = $maxWidth;
|
|
$height = $maxHeight;
|
|
}
|
|
|
|
// Calculate the preview size
|
|
list($width, $height) = $this->calculateSize($width, $height, $crop, $mode, $maxWidth, $maxHeight);
|
|
|
|
// No need to generate a preview that is just the max preview
|
|
if ($width === $maxWidth && $height === $maxHeight) {
|
|
return $maxPreview;
|
|
}
|
|
|
|
// Try to get a cached preview. Else generate (and store) one
|
|
try {
|
|
try {
|
|
$file = $this->getCachedPreview($previewFolder, $width, $height, $crop, $maxPreview->getMimeType());
|
|
} catch (NotFoundException $e) {
|
|
$file = $this->generatePreview($previewFolder, $maxPreview, $width, $height, $crop, $maxWidth, $maxHeight);
|
|
}
|
|
} catch (\InvalidArgumentException $e) {
|
|
throw new NotFoundException();
|
|
}
|
|
|
|
return $file;
|
|
}
|
|
|
|
/**
|
|
* @param ISimpleFolder $previewFolder
|
|
* @param File $file
|
|
* @param string $mimeType
|
|
* @return ISimpleFile
|
|
* @throws NotFoundException
|
|
*/
|
|
private function getMaxPreview(ISimpleFolder $previewFolder, File $file, $mimeType) {
|
|
$nodes = $previewFolder->getDirectoryListing();
|
|
|
|
foreach ($nodes as $node) {
|
|
if (strpos($node->getName(), 'max')) {
|
|
return $node;
|
|
}
|
|
}
|
|
|
|
$previewProviders = $this->previewManager->getProviders();
|
|
foreach ($previewProviders as $supportedMimeType => $providers) {
|
|
if (!preg_match($supportedMimeType, $mimeType)) {
|
|
continue;
|
|
}
|
|
|
|
foreach ($providers as $provider) {
|
|
$provider = $this->helper->getProvider($provider);
|
|
if (!($provider instanceof IProvider)) {
|
|
continue;
|
|
}
|
|
|
|
$maxWidth = (int)$this->config->getSystemValue('preview_max_x', 4096);
|
|
$maxHeight = (int)$this->config->getSystemValue('preview_max_y', 4096);
|
|
|
|
$preview = $this->helper->getThumbnail($provider, $file, $maxWidth, $maxHeight);
|
|
|
|
if (!($preview instanceof IImage)) {
|
|
continue;
|
|
}
|
|
|
|
// Try to get the extention.
|
|
try {
|
|
$ext = $this->getExtention($preview->dataMimeType());
|
|
} catch (\InvalidArgumentException $e) {
|
|
// Just continue to the next iteration if this preview doesn't have a valid mimetype
|
|
continue;
|
|
}
|
|
|
|
$path = (string)$preview->width() . '-' . (string)$preview->height() . '-max.' . $ext;
|
|
try {
|
|
$file = $previewFolder->newFile($path);
|
|
$file->putContent($preview->data());
|
|
} catch (NotPermittedException $e) {
|
|
throw new NotFoundException();
|
|
}
|
|
|
|
return $file;
|
|
}
|
|
}
|
|
|
|
throw new NotFoundException();
|
|
}
|
|
|
|
/**
|
|
* @param ISimpleFile $file
|
|
* @return int[]
|
|
*/
|
|
private function getPreviewSize(ISimpleFile $file) {
|
|
$size = explode('-', $file->getName());
|
|
return [(int)$size[0], (int)$size[1]];
|
|
}
|
|
|
|
/**
|
|
* @param int $width
|
|
* @param int $height
|
|
* @param bool $crop
|
|
* @param string $mimeType
|
|
* @return string
|
|
*/
|
|
private function generatePath($width, $height, $crop, $mimeType) {
|
|
$path = (string)$width . '-' . (string)$height;
|
|
if ($crop) {
|
|
$path .= '-crop';
|
|
}
|
|
|
|
$ext = $this->getExtention($mimeType);
|
|
$path .= '.' . $ext;
|
|
return $path;
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
* @param int $width
|
|
* @param int $height
|
|
* @param bool $crop
|
|
* @param string $mode
|
|
* @param int $maxWidth
|
|
* @param int $maxHeight
|
|
* @return int[]
|
|
*/
|
|
private function calculateSize($width, $height, $crop, $mode, $maxWidth, $maxHeight) {
|
|
|
|
/*
|
|
* If we are not cropping we have to make sure the requested image
|
|
* respects the aspect ratio of the original.
|
|
*/
|
|
if (!$crop) {
|
|
$ratio = $maxHeight / $maxWidth;
|
|
|
|
if ($width === -1) {
|
|
$width = $height / $ratio;
|
|
}
|
|
if ($height === -1) {
|
|
$height = $width * $ratio;
|
|
}
|
|
|
|
$ratioH = $height / $maxHeight;
|
|
$ratioW = $width / $maxWidth;
|
|
|
|
/*
|
|
* Fill means that the $height and $width are the max
|
|
* Cover means min.
|
|
*/
|
|
if ($mode === IPreview::MODE_FILL) {
|
|
if ($ratioH > $ratioW) {
|
|
$height = $width * $ratio;
|
|
} else {
|
|
$width = $height / $ratio;
|
|
}
|
|
} else if ($mode === IPreview::MODE_COVER) {
|
|
if ($ratioH > $ratioW) {
|
|
$width = $height / $ratio;
|
|
} else {
|
|
$height = $width * $ratio;
|
|
}
|
|
}
|
|
}
|
|
|
|
if ($height !== $maxHeight && $width !== $maxWidth) {
|
|
/*
|
|
* Scale to the nearest power of two
|
|
*/
|
|
$pow2height = 2 ** ceil(log($height) / log(2));
|
|
$pow2width = 2 ** ceil(log($width) / log(2));
|
|
|
|
$ratioH = $height / $pow2height;
|
|
$ratioW = $width / $pow2width;
|
|
|
|
if ($ratioH < $ratioW) {
|
|
$width = $pow2width;
|
|
$height /= $ratioW;
|
|
} else {
|
|
$height = $pow2height;
|
|
$width /= $ratioH;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Make sure the requested height and width fall within the max
|
|
* of the preview.
|
|
*/
|
|
if ($height > $maxHeight) {
|
|
$ratio = $height / $maxHeight;
|
|
$height = $maxHeight;
|
|
$width /= $ratio;
|
|
}
|
|
if ($width > $maxWidth) {
|
|
$ratio = $width / $maxWidth;
|
|
$width = $maxWidth;
|
|
$height /= $ratio;
|
|
}
|
|
|
|
return [(int)round($width), (int)round($height)];
|
|
}
|
|
|
|
/**
|
|
* @param ISimpleFolder $previewFolder
|
|
* @param ISimpleFile $maxPreview
|
|
* @param int $width
|
|
* @param int $height
|
|
* @param bool $crop
|
|
* @param int $maxWidth
|
|
* @param int $maxHeight
|
|
* @return ISimpleFile
|
|
* @throws NotFoundException
|
|
* @throws \InvalidArgumentException if the preview would be invalid (in case the original image is invalid)
|
|
*/
|
|
private function generatePreview(ISimpleFolder $previewFolder, ISimpleFile $maxPreview, $width, $height, $crop, $maxWidth, $maxHeight) {
|
|
$preview = $this->helper->getImage($maxPreview);
|
|
|
|
if (!$preview->valid()) {
|
|
throw new \InvalidArgumentException('Failed to generate preview, failed to load image');
|
|
}
|
|
|
|
if ($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;
|
|
}
|
|
$preview->preciseResize(round($scaleW), round($scaleH));
|
|
}
|
|
$cropX = floor(abs($width - $preview->width()) * 0.5);
|
|
$cropY = 0;
|
|
$preview->crop($cropX, $cropY, $width, $height);
|
|
} else {
|
|
$preview->resize(max($width, $height));
|
|
}
|
|
|
|
|
|
$path = $this->generatePath($width, $height, $crop, $preview->dataMimeType());
|
|
try {
|
|
$file = $previewFolder->newFile($path);
|
|
$file->putContent($preview->data());
|
|
} catch (NotPermittedException $e) {
|
|
throw new NotFoundException();
|
|
}
|
|
|
|
return $file;
|
|
}
|
|
|
|
/**
|
|
* @param ISimpleFolder $previewFolder
|
|
* @param int $width
|
|
* @param int $height
|
|
* @param bool $crop
|
|
* @param string $mimeType
|
|
* @return ISimpleFile
|
|
*
|
|
* @throws NotFoundException
|
|
*/
|
|
private function getCachedPreview(ISimpleFolder $previewFolder, $width, $height, $crop, $mimeType) {
|
|
$path = $this->generatePath($width, $height, $crop, $mimeType);
|
|
|
|
return $previewFolder->getFile($path);
|
|
}
|
|
|
|
/**
|
|
* Get the specific preview folder for this file
|
|
*
|
|
* @param File $file
|
|
* @return ISimpleFolder
|
|
*/
|
|
private function getPreviewFolder(File $file) {
|
|
try {
|
|
$folder = $this->appData->getFolder($file->getId());
|
|
} catch (NotFoundException $e) {
|
|
$folder = $this->appData->newFolder($file->getId());
|
|
}
|
|
|
|
return $folder;
|
|
}
|
|
|
|
/**
|
|
* @param string $mimeType
|
|
* @return null|string
|
|
* @throws \InvalidArgumentException
|
|
*/
|
|
private function getExtention($mimeType) {
|
|
switch ($mimeType) {
|
|
case 'image/png':
|
|
return 'png';
|
|
case 'image/jpeg':
|
|
return 'jpg';
|
|
case 'image/gif':
|
|
return 'gif';
|
|
default:
|
|
throw new \InvalidArgumentException('Not a valid mimetype');
|
|
}
|
|
}
|
|
}
|