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<?php
declare(strict_types=1);
/**
* SPDX-FileCopyrightText: 2024 Nextcloud GmbH and Nextcloud contributors
* SPDX-License-Identifier: AGPL-3.0-or-later
*/
namespace OC\Files\Conversion;
use OC\AppFramework\Bootstrap\Coordinator;
use OC\ForbiddenException;
use OC\SystemConfig;
use OCP\Files\Conversion\IConversionManager;
use OCP\Files\Conversion\IConversionProvider;
use OCP\Files\File;
use OCP\Files\GenericFileException;
use OCP\Files\IRootFolder;
use OCP\IL10N;
use OCP\ITempManager;
use OCP\L10N\IFactory;
use OCP\PreConditionNotMetException;
use Psr\Container\ContainerExceptionInterface;
use Psr\Container\ContainerInterface;
use Psr\Container\NotFoundExceptionInterface;
use Psr\Log\LoggerInterface;
use RuntimeException;
use Throwable;
class ConversionManager implements IConversionManager {
/** @var string[] */
private array $preferredApps = [
'richdocuments',
];
/** @var list<IConversionProvider> */
private array $preferredProviders = [];
/** @var list<IConversionProvider> */
private array $providers = [];
private IL10N $l10n;
public function __construct(
private Coordinator $coordinator,
private ContainerInterface $serverContainer,
private IRootFolder $rootFolder,
private ITempManager $tempManager,
private LoggerInterface $logger,
private SystemConfig $config,
IFactory $l10nFactory,
) {
$this->l10n = $l10nFactory->get('files');
}
public function hasProviders(): bool {
$context = $this->coordinator->getRegistrationContext();
return !empty($context->getFileConversionProviders());
}
public function getProviders(): array {
$providers = [];
foreach ($this->getRegisteredProviders() as $provider) {
$providers = array_merge($providers, $provider->getSupportedMimeTypes());
}
return $providers;
}
public function convert(File $file, string $targetMimeType, ?string $destination = null): string {
if (!$this->hasProviders()) {
throw new PreConditionNotMetException($this->l10n->t('No file conversion providers available'));
}
// Operate in mebibytes
$fileSize = $file->getSize() / (1024 * 1024);
$threshold = $this->config->getValue('max_file_conversion_filesize', 100);
if ($fileSize > $threshold) {
throw new GenericFileException($this->l10n->t('File is too large to convert'));
}
$fileMimeType = $file->getMimetype();
$validProvider = $this->getValidProvider($fileMimeType, $targetMimeType);
if ($validProvider !== null) {
// Get the target extension given by the provider
$targetExtension = '';
foreach ($validProvider->getSupportedMimeTypes() as $mimeProvider) {
if ($mimeProvider->getTo() === $targetMimeType) {
$targetExtension = $mimeProvider->getExtension();
break;
}
}
// If destination not provided, we use the same path
// as the original file, but with the new extension
if ($destination === null) {
$basename = pathinfo($file->getPath(), PATHINFO_FILENAME);
$parent = $file->getParent();
$destination = $parent->getFullPath($basename . '.' . $targetExtension);
}
// If destination doesn't match the target extension, we throw an error
if (pathinfo($destination, PATHINFO_EXTENSION) !== $targetExtension) {
throw new GenericFileException($this->l10n->t('Destination does not match conversion extension'));
}
// Check destination before converting
$this->checkDestination($destination);
// Convert the file and write it to the destination
$convertedFile = $validProvider->convertFile($file, $targetMimeType);
$convertedFile = $this->writeToDestination($destination, $convertedFile);
return $convertedFile->getPath();
}
throw new RuntimeException($this->l10n->t('Could not convert file'));
}
/**
* @return list<IConversionProvider>
*/
private function getRegisteredProviders(): array {
$context = $this->coordinator->getRegistrationContext();
foreach ($context->getFileConversionProviders() as $providerRegistration) {
$class = $providerRegistration->getService();
$appId = $providerRegistration->getAppId();
try {
if (in_array($appId, $this->preferredApps)) {
$this->preferredProviders[$class] = $this->serverContainer->get($class);
continue;
}
$this->providers[$class] = $this->serverContainer->get($class);
} catch (NotFoundExceptionInterface|ContainerExceptionInterface|Throwable $e) {
$this->logger->error('Failed to load file conversion provider ' . $class, [
'exception' => $e,
]);
}
}
return array_values(array_merge([], $this->preferredProviders, $this->providers));
}
private function checkDestination(string $destination): void {
if (!$this->rootFolder->nodeExists(dirname($destination))) {
throw new ForbiddenException($this->l10n->t('Destination does not exist'));
}
$folder = $this->rootFolder->get(dirname($destination));
if (!$folder->isCreatable()) {
throw new ForbiddenException($this->l10n->t('Destination is not creatable'));
}
}
private function writeToDestination(string $destination, mixed $content): File {
$this->checkDestination($destination);
if ($this->rootFolder->nodeExists($destination)) {
$file = $this->rootFolder->get($destination);
$parent = $file->getParent();
// Folder permissions is already checked in checkDestination method
$newName = $parent->getNonExistingName(basename($destination));
$destination = $parent->getFullPath($newName);
}
return $this->rootFolder->newFile($destination, $content);
}
private function getValidProvider(string $fileMimeType, string $targetMimeType): ?IConversionProvider {
foreach ($this->getRegisteredProviders() as $provider) {
foreach ($provider->getSupportedMimeTypes() as $mimeProvider) {
if ($mimeProvider->getFrom() === $fileMimeType && $mimeProvider->getTo() === $targetMimeType) {
return $provider;
}
}
}
return null;
}
}
|
