nextcloud/apps/dav/lib/CardDAV/PhotoCache.php

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<?php
/**
*
*
* @author Morris Jobke <hey@morrisjobke.de>
* @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\DAV\CardDAV;
use OCP\Files\IAppData;
use OCP\Files\NotFoundException;
use OCP\Files\NotPermittedException;
use OCP\Files\SimpleFS\ISimpleFile;
use OCP\Files\SimpleFS\ISimpleFolder;
use Sabre\CardDAV\Card;
use Sabre\VObject\Property\Binary;
use Sabre\VObject\Reader;
class PhotoCache {
/** @var IAppData $appData */
protected $appData;
/**
* PhotoCache constructor.
*
* @param IAppData $appData
*/
public function __construct(IAppData $appData) {
$this->appData = $appData;
}
/**
* @param int $addressBookId
* @param string $cardUri
* @param int $size
* @param Card $card
*
* @return ISimpleFile
* @throws NotFoundException
*/
public function get($addressBookId, $cardUri, $size, Card $card) {
$folder = $this->getFolder($addressBookId, $cardUri);
if ($this->isEmpty($folder)) {
$this->init($folder, $card);
}
if (!$this->hasPhoto($folder)) {
throw new NotFoundException();
}
if ($size !== -1) {
$size = 2 ** ceil(log($size) / log(2));
}
return $this->getFile($folder, $size);
}
/**
* @param ISimpleFolder $folder
* @return bool
*/
private function isEmpty(ISimpleFolder $folder) {
return $folder->getDirectoryListing() === [];
}
/**
* @param ISimpleFolder $folder
* @param Card $card
*/
private function init(ISimpleFolder $folder, Card $card) {
$data = $this->getPhoto($card);
if ($data === false) {
$folder->newFile('nophoto');
} else {
switch ($data['Content-Type']) {
case 'image/png':
$ext = 'png';
break;
case 'image/jpeg':
$ext = 'jpg';
break;
case 'image/gif':
$ext = 'gif';
break;
}
$file = $folder->newFile('photo.' . $ext);
$file->putContent($data['body']);
}
}
private function hasPhoto(ISimpleFolder $folder) {
return !$folder->fileExists('nophoto');
}
private function getFile(ISimpleFolder $folder, $size) {
$ext = $this->getExtension($folder);
if ($size === -1) {
$path = 'photo.' . $ext;
} else {
$path = 'photo.' . $size . '.' . $ext;
}
try {
$file = $folder->getFile($path);
} catch (NotFoundException $e) {
if ($size <= 0) {
throw new NotFoundException;
}
$photo = new \OC_Image();
/** @var ISimpleFile $file */
$file = $folder->getFile('photo.' . $ext);
$photo->loadFromData($file->getContent());
$ratio = $photo->width() / $photo->height();
if ($ratio < 1) {
$ratio = 1/$ratio;
}
$size = (int)($size * $ratio);
if ($size !== -1) {
$photo->resize($size);
}
try {
$file = $folder->newFile($path);
$file->putContent($photo->data());
} catch (NotPermittedException $e) {
}
}
return $file;
}
/**
* @param int $addressBookId
* @param string $cardUri
* @return ISimpleFolder
*/
private function getFolder($addressBookId, $cardUri) {
$hash = md5($addressBookId . ' ' . $cardUri);
try {
return $this->appData->getFolder($hash);
} catch (NotFoundException $e) {
return $this->appData->newFolder($hash);
}
}
/**
* Get the extension of the avatar. If there is no avatar throw Exception
*
* @param ISimpleFolder $folder
* @return string
* @throws NotFoundException
*/
private function getExtension(ISimpleFolder $folder) {
if ($folder->fileExists('photo.jpg')) {
return 'jpg';
} elseif ($folder->fileExists('photo.png')) {
return 'png';
} elseif ($folder->fileExists('photo.gif')) {
return 'gif';
}
throw new NotFoundException;
}
private function getPhoto(Card $node) {
try {
$vObject = $this->readCard($node->get());
if (!$vObject->PHOTO) {
return false;
}
$photo = $vObject->PHOTO;
$type = $this->getType($photo);
$val = $photo->getValue();
if ($photo->getValueType() === 'URI') {
$parsed = \Sabre\URI\parse($val);
//only allow data://
if ($parsed['scheme'] !== 'data') {
return false;
}
if (substr_count($parsed['path'], ';') === 1) {
list($type,) = explode(';', $parsed['path']);
}
$val = file_get_contents($val);
}
$allowedContentTypes = [
'image/png',
'image/jpeg',
'image/gif',
];
if(!in_array($type, $allowedContentTypes, true)) {
$type = 'application/octet-stream';
}
return [
'Content-Type' => $type,
'body' => $val
];
} catch(\Exception $ex) {
}
return false;
}
/**
* @param string $cardData
* @return \Sabre\VObject\Document
*/
private function readCard($cardData) {
return Reader::read($cardData);
}
/**
* @param Binary $photo
* @return string
*/
private function getType(Binary $photo) {
$params = $photo->parameters();
if (isset($params['TYPE']) || isset($params['MEDIATYPE'])) {
/** @var Parameter $typeParam */
$typeParam = isset($params['TYPE']) ? $params['TYPE'] : $params['MEDIATYPE'];
$type = $typeParam->getValue();
if (strpos($type, 'image/') === 0) {
return $type;
} else {
return 'image/' . strtolower($type);
}
}
return '';
}
/**
* @param int $addressBookId
* @param string $cardUri
*/
public function delete($addressBookId, $cardUri) {
$folder = $this->getFolder($addressBookId, $cardUri);
$folder->delete();
}
}