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<?php
/**
* @copyright Copyright (c) 2016 Joas Schilling <coding@schilljs.com>
*
* @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\WorkflowEngine\Check;
use OCA\WorkflowEngine\Entity\File;
use OCP\Files\IMimeTypeDetector;
use OCP\Files\Storage\IStorage;
use OCP\IL10N;
use OCP\IRequest;
use OCP\WorkflowEngine\IFileCheck;
class FileMimeType extends AbstractStringCheck implements IFileCheck {
use TFileCheck {
setFileInfo as _setFileInfo;
}
/** @var array */
protected $mimeType;
/** @var IRequest */
protected $request;
/** @var IMimeTypeDetector */
protected $mimeTypeDetector;
/**
* @param IL10N $l
* @param IRequest $request
* @param IMimeTypeDetector $mimeTypeDetector
*/
public function __construct(IL10N $l, IRequest $request, IMimeTypeDetector $mimeTypeDetector) {
parent::__construct($l);
$this->request = $request;
$this->mimeTypeDetector = $mimeTypeDetector;
}
/**
* @param IStorage $storage
* @param string $path
* @param bool $isDir
*/
public function setFileInfo(IStorage $storage, string $path, bool $isDir = false): void {
$this->_setFileInfo($storage, $path, $isDir);
if (!isset($this->mimeType[$this->storage->getId()][$this->path])
|| $this->mimeType[$this->storage->getId()][$this->path] === '') {
if ($isDir) {
$this->mimeType[$this->storage->getId()][$this->path] = 'httpd/unix-directory';
} else {
$this->mimeType[$this->storage->getId()][$this->path] = null;
}
}
}
/**
* The mimetype is only cached if the file exists. Otherwise files access
* control will cache "application/octet-stream" for all the target node on:
* rename, move, copy and all other methods which create a new item
*
* To check this:
* 1. Add an automated tagging rule which tags on mimetype NOT "httpd/unix-directory"
* 2. Add an access control rule which checks for any mimetype
* 3. Create a folder and rename it, the folder should not be tagged, but it is
*
* @param string $storageId
* @param string|null $path
* @param string $mimeType
* @return string
*/
protected function cacheAndReturnMimeType(string $storageId, ?string $path, string $mimeType): string {
if ($path !== null && $this->storage->file_exists($path)) {
$this->mimeType[$storageId][$path] = $mimeType;
}
return $mimeType;
}
/**
* Make sure that even though the content based check returns an application/octet-stream can still be checked based on mimetypemappings of their extension
*
* @param string $operator
* @param string $value
* @return bool
*/
public function executeCheck($operator, $value) {
$actualValue = $this->getActualValue();
$plainMimetypeResult = $this->executeStringCheck($operator, $value, $actualValue);
if ($actualValue === 'httpd/unix-directory') {
return $plainMimetypeResult;
}
$detectMimetypeBasedOnFilenameResult = $this->executeStringCheck($operator, $value, $this->mimeTypeDetector->detectPath($this->path));
return $plainMimetypeResult || $detectMimetypeBasedOnFilenameResult;
}
/**
* @return string
*/
protected function getActualValue() {
if ($this->mimeType[$this->storage->getId()][$this->path] !== null) {
return $this->mimeType[$this->storage->getId()][$this->path];
}
if ($this->storage->is_dir($this->path)) {
return $this->cacheAndReturnMimeType($this->storage->getId(), $this->path, 'httpd/unix-directory');
}
if ($this->storage->file_exists($this->path)) {
$path = $this->storage->getLocalFile($this->path);
$mimeType = $this->mimeTypeDetector->detectContent($path);
return $this->cacheAndReturnMimeType($this->storage->getId(), $this->path, $mimeType);
}
if ($this->isWebDAVRequest() || $this->isPublicWebDAVRequest()) {
// Creating a folder
if ($this->request->getMethod() === 'MKCOL') {
return 'httpd/unix-directory';
}
}
// We do not cache this, as the file did not exist yet.
// In case it does in the future, we will check with detectContent()
// again to get the real mimetype of the content, rather than
// guessing it from the path.
return $this->mimeTypeDetector->detectPath($this->path);
}
/**
* @return bool
*/
protected function isWebDAVRequest() {
return substr($this->request->getScriptName(), 0 - strlen('/remote.php')) === '/remote.php' && (
$this->request->getPathInfo() === '/webdav' ||
strpos($this->request->getPathInfo(), '/webdav/') === 0 ||
$this->request->getPathInfo() === '/dav/files' ||
strpos($this->request->getPathInfo(), '/dav/files/') === 0 ||
$this->request->getPathInfo() === '/dav/uploads' ||
strpos($this->request->getPathInfo(), '/dav/uploads/') === 0
);
}
/**
* @return bool
*/
protected function isPublicWebDAVRequest() {
return substr($this->request->getScriptName(), 0 - strlen('/public.php')) === '/public.php' && (
$this->request->getPathInfo() === '/webdav' ||
strpos($this->request->getPathInfo(), '/webdav/') === 0
);
}
public function supportedEntities(): array {
return [ File::class ];
}
public function isAvailableForScope(int $scope): bool {
return true;
}
}
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