nextcloud/apps/theming/lib/ImageManager.php

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<?php
/**
* @copyright Copyright (c) 2016 Julius Härtl <jus@bitgrid.net>
*
* @author Christoph Wurst <christoph@winzerhof-wurst.at>
* @author Daniel Kesselberg <mail@danielkesselberg.de>
* @author Julius Haertl <jus@bitgrid.net>
* @author Julius Härtl <jus@bitgrid.net>
* @author Michael Weimann <mail@michael-weimann.eu>
* @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 OCA\Theming;
use OCP\Files\IAppData;
use OCP\Files\NotFoundException;
use OCP\Files\NotPermittedException;
use OCP\Files\SimpleFS\ISimpleFile;
use OCP\Files\SimpleFS\ISimpleFolder;
use OCP\ICacheFactory;
use OCP\IConfig;
use OCP\ILogger;
use OCP\ITempManager;
use OCP\IURLGenerator;
class ImageManager {
/** @var IConfig */
private $config;
/** @var IAppData */
private $appData;
/** @var IURLGenerator */
private $urlGenerator;
/** @var array */
private $supportedImageKeys = ['background', 'logo', 'logoheader', 'favicon'];
/** @var ICacheFactory */
private $cacheFactory;
/** @var ILogger */
private $logger;
/** @var ITempManager */
private $tempManager;
public function __construct(IConfig $config,
IAppData $appData,
IURLGenerator $urlGenerator,
ICacheFactory $cacheFactory,
ILogger $logger,
ITempManager $tempManager
) {
$this->config = $config;
$this->appData = $appData;
$this->urlGenerator = $urlGenerator;
$this->cacheFactory = $cacheFactory;
$this->logger = $logger;
$this->tempManager = $tempManager;
}
public function getImageUrl(string $key, bool $useSvg = true): string {
$cacheBusterCounter = $this->config->getAppValue('theming', 'cachebuster', '0');
try {
$image = $this->getImage($key, $useSvg);
return $this->urlGenerator->linkToRoute('theming.Theming.getImage', [ 'key' => $key ]) . '?v=' . $cacheBusterCounter;
} catch (NotFoundException $e) {
}
switch ($key) {
case 'logo':
case 'logoheader':
case 'favicon':
return $this->urlGenerator->imagePath('core', 'logo/logo.png') . '?v=' . $cacheBusterCounter;
case 'background':
return $this->urlGenerator->imagePath('core', 'background.png') . '?v=' . $cacheBusterCounter;
}
}
public function getImageUrlAbsolute(string $key, bool $useSvg = true): string {
return $this->urlGenerator->getAbsoluteURL($this->getImageUrl($key, $useSvg));
}
/**
* @param string $key
* @param bool $useSvg
* @return ISimpleFile
* @throws NotFoundException
* @throws NotPermittedException
*/
public function getImage(string $key, bool $useSvg = true): ISimpleFile {
$pngFile = null;
$logo = $this->config->getAppValue('theming', $key . 'Mime', false);
$folder = $this->appData->getFolder('images');
if ($logo === false || !$folder->fileExists($key)) {
throw new NotFoundException();
}
if (!$useSvg && $this->shouldReplaceIcons()) {
if (!$folder->fileExists($key . '.png')) {
try {
$finalIconFile = new \Imagick();
$finalIconFile->setBackgroundColor('none');
$finalIconFile->readImageBlob($folder->getFile($key)->getContent());
$finalIconFile->setImageFormat('png32');
$pngFile = $folder->newFile($key . '.png');
$pngFile->putContent($finalIconFile->getImageBlob());
} catch (\ImagickException $e) {
$this->logger->info('The image was requested to be no SVG file, but converting it to PNG failed: ' . $e->getMessage());
$pngFile = null;
}
} else {
$pngFile = $folder->getFile($key . '.png');
}
}
if ($pngFile !== null) {
return $pngFile;
}
return $folder->getFile($key);
}
public function getCustomImages(): array {
$images = [];
foreach ($this->supportedImageKeys as $key) {
$images[$key] = [
'mime' => $this->config->getAppValue('theming', $key . 'Mime', ''),
'url' => $this->getImageUrl($key),
];
}
return $images;
}
/**
* Get folder for current theming files
*
* @return ISimpleFolder
* @throws NotPermittedException
*/
public function getCacheFolder(): ISimpleFolder {
$cacheBusterValue = $this->config->getAppValue('theming', 'cachebuster', '0');
try {
$folder = $this->appData->getFolder($cacheBusterValue);
} catch (NotFoundException $e) {
$folder = $this->appData->newFolder($cacheBusterValue);
$this->cleanup();
}
return $folder;
}
/**
* Get a file from AppData
*
* @param string $filename
* @throws NotFoundException
* @return \OCP\Files\SimpleFS\ISimpleFile
* @throws NotPermittedException
*/
public function getCachedImage(string $filename): ISimpleFile {
$currentFolder = $this->getCacheFolder();
return $currentFolder->getFile($filename);
}
/**
* Store a file for theming in AppData
*
* @param string $filename
* @param string $data
* @return \OCP\Files\SimpleFS\ISimpleFile
* @throws NotFoundException
* @throws NotPermittedException
*/
public function setCachedImage(string $filename, string $data): ISimpleFile {
$currentFolder = $this->getCacheFolder();
if ($currentFolder->fileExists($filename)) {
$file = $currentFolder->getFile($filename);
} else {
$file = $currentFolder->newFile($filename);
}
$file->putContent($data);
return $file;
}
public function delete(string $key) {
/* ignore exceptions, since we don't want to fail hard if something goes wrong during cleanup */
try {
$file = $this->appData->getFolder('images')->getFile($key);
$file->delete();
} catch (NotFoundException $e) {
} catch (NotPermittedException $e) {
}
try {
$file = $this->appData->getFolder('images')->getFile($key . '.png');
$file->delete();
} catch (NotFoundException $e) {
} catch (NotPermittedException $e) {
}
}
public function updateImage(string $key, string $tmpFile) {
$this->delete($key);
try {
$folder = $this->appData->getFolder('images');
} catch (NotFoundException $e) {
$folder = $this->appData->newFolder('images');
}
$target = $folder->newFile($key);
$supportedFormats = $this->getSupportedUploadImageFormats($key);
$detectedMimeType = mime_content_type($tmpFile);
if (!in_array($detectedMimeType, $supportedFormats, true)) {
throw new \Exception('Unsupported image type');
}
if ($key === 'background' && strpos($detectedMimeType, 'image/svg') === false) {
// Optimize the image since some people may upload images that will be
// either to big or are not progressive rendering.
$newImage = @imagecreatefromstring(file_get_contents($tmpFile));
// Preserve transparency
imagesavealpha($newImage, true);
imagealphablending($newImage, true);
$tmpFile = $this->tempManager->getTemporaryFile();
$newWidth = (int)(imagesx($newImage) < 4096 ? imagesx($newImage) : 4096);
$newHeight = (int)(imagesy($newImage) / (imagesx($newImage) / $newWidth));
$outputImage = imagescale($newImage, $newWidth, $newHeight);
imageinterlace($outputImage, 1);
imagepng($outputImage, $tmpFile, 8);
imagedestroy($outputImage);
$target->putContent(file_get_contents($tmpFile));
} else {
$target->putContent(file_get_contents($tmpFile));
}
return $detectedMimeType;
}
/**
* Returns a list of supported mime types for image uploads.
* "favicon" images are only allowed to be SVG when imagemagick with SVG support is available.
*
* @param string $key The image key, e.g. "favicon"
* @return array
*/
private function getSupportedUploadImageFormats(string $key): array {
$supportedFormats = ['image/jpeg', 'image/png', 'image/gif'];
if ($key !== 'favicon' || $this->shouldReplaceIcons() === true) {
$supportedFormats[] = 'image/svg+xml';
$supportedFormats[] = 'image/svg';
}
return $supportedFormats;
}
/**
* remove cached files that are not required any longer
*
* @throws NotPermittedException
* @throws NotFoundException
*/
public function cleanup() {
$currentFolder = $this->getCacheFolder();
$folders = $this->appData->getDirectoryListing();
foreach ($folders as $folder) {
if ($folder->getName() !== 'images' && $folder->getName() !== $currentFolder->getName()) {
$folder->delete();
}
}
}
/**
* Check if Imagemagick is enabled and if SVG is supported
* otherwise we can't render custom icons
*
* @return bool
*/
public function shouldReplaceIcons() {
$cache = $this->cacheFactory->createDistributed('theming-' . $this->urlGenerator->getBaseUrl());
if ($value = $cache->get('shouldReplaceIcons')) {
return (bool)$value;
}
$value = false;
if (extension_loaded('imagick')) {
if (count(\Imagick::queryFormats('SVG')) >= 1) {
$value = true;
}
}
$cache->set('shouldReplaceIcons', $value);
return $value;
}
}