825 lines
19 KiB
PHP
Executable File
825 lines
19 KiB
PHP
Executable File
<?php
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/**
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* Copyright (c) 2013 Frank Karlitschek frank@owncloud.org
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* Copyright (c) 2013 Georg Ehrke georg@ownCloud.com
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* This file is licensed under the Affero General Public License version 3 or
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* later.
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* See the COPYING-README file.
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*
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* Thumbnails:
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* structure of filename:
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* /data/user/thumbnails/pathhash/x-y.png
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*
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*/
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namespace OC;
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use OC\Files\Filesystem;
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use OC\Preview\Provider;
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use OCP\Files\NotFoundException;
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require_once 'preview/image.php';
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require_once 'preview/movies.php';
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require_once 'preview/mp3.php';
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require_once 'preview/pdf.php';
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require_once 'preview/svg.php';
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require_once 'preview/txt.php';
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require_once 'preview/unknown.php';
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require_once 'preview/office.php';
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require_once 'preview/tiff.php';
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class Preview {
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//the thumbnail folder
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const THUMBNAILS_FOLDER = 'thumbnails';
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//config
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private $maxScaleFactor;
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private $configMaxX;
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private $configMaxY;
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//fileview object
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private $fileView = null;
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private $userView = null;
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//vars
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private $file;
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private $maxX;
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private $maxY;
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private $scalingUp;
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private $mimeType;
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private $keepAspect = false;
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//filemapper used for deleting previews
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// index is path, value is fileinfo
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static public $deleteFileMapper = array();
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/**
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* preview images object
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*
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* @var \OC_Image
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*/
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private $preview;
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//preview providers
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static private $providers = array();
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static private $registeredProviders = array();
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/**
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* @var \OCP\Files\FileInfo
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*/
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protected $info;
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/**
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* check if thumbnail or bigger version of thumbnail of file is cached
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* @param string $user userid - if no user is given, OC_User::getUser will be used
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* @param string $root path of root
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* @param string $file The path to the file where you want a thumbnail from
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* @param int $maxX The maximum X size of the thumbnail. It can be smaller depending on the shape of the image
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* @param int $maxY The maximum Y size of the thumbnail. It can be smaller depending on the shape of the image
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* @param bool $scalingUp Disable/Enable upscaling of previews
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* @throws \Exception
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* @return mixed (bool / string)
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* false if thumbnail does not exist
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* path to thumbnail if thumbnail exists
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*/
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public function __construct($user = '', $root = '/', $file = '', $maxX = 1, $maxY = 1, $scalingUp = true) {
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//init fileviews
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if ($user === '') {
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$user = \OC_User::getUser();
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}
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$this->fileView = new \OC\Files\View('/' . $user . '/' . $root);
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$this->userView = new \OC\Files\View('/' . $user);
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//set config
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$this->configMaxX = \OC_Config::getValue('preview_max_x', null);
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$this->configMaxY = \OC_Config::getValue('preview_max_y', null);
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$this->maxScaleFactor = \OC_Config::getValue('preview_max_scale_factor', 2);
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//save parameters
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$this->setFile($file);
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$this->setMaxX($maxX);
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$this->setMaxY($maxY);
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$this->setScalingUp($scalingUp);
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$this->preview = null;
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//check if there are preview backends
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if (empty(self::$providers)) {
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self::initProviders();
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}
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if (empty(self::$providers)) {
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\OC_Log::write('core', 'No preview providers exist', \OC_Log::ERROR);
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throw new \Exception('No preview providers');
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}
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// Check if file is valid
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if($this->isFileValid() === false) {
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throw new NotFoundException('File not found.');
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}
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}
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/**
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* returns the path of the file you want a thumbnail from
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* @return string
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*/
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public function getFile() {
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return $this->file;
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}
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/**
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* returns the max width of the preview
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* @return integer
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*/
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public function getMaxX() {
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return $this->maxX;
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}
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/**
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* returns the max height of the preview
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* @return integer
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*/
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public function getMaxY() {
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return $this->maxY;
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}
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/**
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* returns whether or not scalingup is enabled
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* @return bool
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*/
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public function getScalingUp() {
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return $this->scalingUp;
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}
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/**
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* returns the name of the thumbnailfolder
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* @return string
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*/
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public function getThumbnailsFolder() {
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return self::THUMBNAILS_FOLDER;
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}
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/**
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* returns the max scale factor
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* @return string
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*/
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public function getMaxScaleFactor() {
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return $this->maxScaleFactor;
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}
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/**
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* returns the max width set in ownCloud's config
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* @return string
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*/
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public function getConfigMaxX() {
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return $this->configMaxX;
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}
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/**
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* returns the max height set in ownCloud's config
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* @return string
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*/
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public function getConfigMaxY() {
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return $this->configMaxY;
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}
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/**
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* @return false|Files\FileInfo|\OCP\Files\FileInfo
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*/
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protected function getFileInfo() {
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$absPath = $this->fileView->getAbsolutePath($this->file);
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$absPath = Files\Filesystem::normalizePath($absPath);
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if(array_key_exists($absPath, self::$deleteFileMapper)) {
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$this->info = self::$deleteFileMapper[$absPath];
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} else if (!$this->info) {
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$this->info = $this->fileView->getFileInfo($this->file);
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}
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return $this->info;
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}
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/**
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* set the path of the file you want a thumbnail from
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* @param string $file
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* @return \OC\Preview $this
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*/
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public function setFile($file) {
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$this->file = $file;
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$this->info = null;
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if ($file !== '') {
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$this->getFileInfo();
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if($this->info !== null && $this->info !== false) {
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$this->mimeType = $this->info->getMimetype();
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}
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}
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return $this;
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}
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/**
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* set mime type explicitly
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* @param string $mimeType
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*/
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public function setMimetype($mimeType) {
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$this->mimeType = $mimeType;
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}
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/**
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* set the the max width of the preview
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* @param int $maxX
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* @throws \Exception
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* @return \OC\Preview $this
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*/
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public function setMaxX($maxX = 1) {
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if ($maxX <= 0) {
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throw new \Exception('Cannot set width of 0 or smaller!');
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}
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$configMaxX = $this->getConfigMaxX();
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if (!is_null($configMaxX)) {
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if ($maxX > $configMaxX) {
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\OC_Log::write('core', 'maxX reduced from ' . $maxX . ' to ' . $configMaxX, \OC_Log::DEBUG);
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$maxX = $configMaxX;
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}
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}
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$this->maxX = $maxX;
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return $this;
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}
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/**
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* set the the max height of the preview
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* @param int $maxY
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* @throws \Exception
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* @return \OC\Preview $this
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*/
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public function setMaxY($maxY = 1) {
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if ($maxY <= 0) {
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throw new \Exception('Cannot set height of 0 or smaller!');
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}
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$configMaxY = $this->getConfigMaxY();
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if (!is_null($configMaxY)) {
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if ($maxY > $configMaxY) {
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\OC_Log::write('core', 'maxX reduced from ' . $maxY . ' to ' . $configMaxY, \OC_Log::DEBUG);
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$maxY = $configMaxY;
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}
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}
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$this->maxY = $maxY;
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return $this;
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}
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/**
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* set whether or not scalingup is enabled
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* @param bool $scalingUp
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* @return \OC\Preview $this
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*/
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public function setScalingup($scalingUp) {
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if ($this->getMaxScaleFactor() === 1) {
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$scalingUp = false;
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}
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$this->scalingUp = $scalingUp;
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return $this;
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}
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public function setKeepAspect($keepAspect) {
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$this->keepAspect = $keepAspect;
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return $this;
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}
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/**
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* check if all parameters are valid
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* @return bool
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*/
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public function isFileValid() {
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$file = $this->getFile();
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if ($file === '') {
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\OC_Log::write('core', 'No filename passed', \OC_Log::DEBUG);
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return false;
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}
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if (!$this->fileView->file_exists($file)) {
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\OC_Log::write('core', 'File:"' . $file . '" not found', \OC_Log::DEBUG);
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return false;
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}
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return true;
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}
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/**
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* deletes previews of a file with specific x and y
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* @return bool
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*/
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public function deletePreview() {
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$file = $this->getFile();
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$fileInfo = $this->getFileInfo($file);
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if($fileInfo !== null && $fileInfo !== false) {
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$fileId = $fileInfo->getId();
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$previewPath = $this->buildCachePath($fileId);
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return $this->userView->unlink($previewPath);
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}
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return false;
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}
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/**
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* deletes all previews of a file
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* @return bool
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*/
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public function deleteAllPreviews() {
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$file = $this->getFile();
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$fileInfo = $this->getFileInfo($file);
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if($fileInfo !== null && $fileInfo !== false) {
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$fileId = $fileInfo->getId();
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$previewPath = $this->getPreviewPath($fileId);
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$this->userView->deleteAll($previewPath);
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return $this->userView->rmdir($previewPath);
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}
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return false;
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}
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/**
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* check if thumbnail or bigger version of thumbnail of file is cached
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* @param int $fileId fileId of the original image
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* @return string|false path to thumbnail if it exists or false
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*/
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public function isCached($fileId) {
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if (is_null($fileId)) {
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return false;
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}
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$preview = $this->buildCachePath($fileId);
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//does a preview with the wanted height and width already exist?
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if ($this->userView->file_exists($preview)) {
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return $preview;
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}
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return $this->isCachedBigger($fileId);
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}
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/**
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* check if a bigger version of thumbnail of file is cached
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* @param int $fileId fileId of the original image
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* @return string|false path to bigger thumbnail if it exists or false
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*/
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private function isCachedBigger($fileId) {
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if (is_null($fileId)) {
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return false;
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}
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// in order to not loose quality we better generate aspect preserving previews from the original file
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if ($this->keepAspect) {
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return false;
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}
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$maxX = $this->getMaxX();
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//array for usable cached thumbnails
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$possibleThumbnails = $this->getPossibleThumbnails($fileId);
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foreach ($possibleThumbnails as $width => $path) {
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if ($width < $maxX) {
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continue;
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} else {
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return $path;
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}
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}
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return false;
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}
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/**
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* get possible bigger thumbnails of the given image
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* @param int $fileId fileId of the original image
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* @return array an array of paths to bigger thumbnails
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*/
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private function getPossibleThumbnails($fileId) {
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if (is_null($fileId)) {
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return array();
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}
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$previewPath = $this->getPreviewPath($fileId);
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$wantedAspectRatio = (float) ($this->getMaxX() / $this->getMaxY());
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//array for usable cached thumbnails
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$possibleThumbnails = array();
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$allThumbnails = $this->userView->getDirectoryContent($previewPath);
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foreach ($allThumbnails as $thumbnail) {
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$name = rtrim($thumbnail['name'], '.png');
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list($x, $y, $aspectRatio) = $this->getDimensionsFromFilename($name);
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if (abs($aspectRatio - $wantedAspectRatio) >= 0.000001
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|| $this->unscalable($x, $y)
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) {
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continue;
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}
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$possibleThumbnails[$x] = $thumbnail['path'];
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}
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ksort($possibleThumbnails);
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return $possibleThumbnails;
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}
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/**
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* @param string $name
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* @return array
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*/
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private function getDimensionsFromFilename($name) {
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$size = explode('-', $name);
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$x = (int) $size[0];
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$y = (int) $size[1];
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$aspectRatio = (float) ($x / $y);
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return array($x, $y, $aspectRatio);
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}
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/**
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* @param int $x
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* @param int $y
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* @return bool
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*/
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private function unscalable($x, $y) {
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$maxX = $this->getMaxX();
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$maxY = $this->getMaxY();
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$scalingUp = $this->getScalingUp();
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$maxScaleFactor = $this->getMaxScaleFactor();
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if ($x < $maxX || $y < $maxY) {
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if ($scalingUp) {
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$scalefactor = $maxX / $x;
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if ($scalefactor > $maxScaleFactor) {
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return true;
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}
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} else {
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return true;
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}
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}
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return false;
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}
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/**
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* return a preview of a file
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* @return \OC_Image
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*/
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public function getPreview() {
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if (!is_null($this->preview) && $this->preview->valid()) {
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return $this->preview;
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}
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$this->preview = null;
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$file = $this->getFile();
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$maxX = $this->getMaxX();
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$maxY = $this->getMaxY();
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$scalingUp = $this->getScalingUp();
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$fileInfo = $this->getFileInfo($file);
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if($fileInfo === null || $fileInfo === false) {
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return new \OC_Image();
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}
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$fileId = $fileInfo->getId();
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$cached = $this->isCached($fileId);
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if ($cached) {
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$stream = $this->userView->fopen($cached, 'r');
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$this->preview = null;
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if ($stream) {
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$image = new \OC_Image();
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$image->loadFromFileHandle($stream);
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$this->preview = $image->valid() ? $image : null;
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$this->resizeAndCrop();
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fclose($stream);
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}
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}
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if (is_null($this->preview)) {
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$preview = null;
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foreach (self::$providers as $supportedMimeType => $provider) {
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if (!preg_match($supportedMimeType, $this->mimeType)) {
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continue;
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}
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\OC_Log::write('core', 'Generating preview for "' . $file . '" with "' . get_class($provider) . '"', \OC_Log::DEBUG);
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/** @var $provider Provider */
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$preview = $provider->getThumbnail($file, $maxX, $maxY, $scalingUp, $this->fileView);
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if (!($preview instanceof \OC_Image)) {
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continue;
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}
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$this->preview = $preview;
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$this->resizeAndCrop();
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$previewPath = $this->getPreviewPath($fileId);
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$cachePath = $this->buildCachePath($fileId);
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if ($this->userView->is_dir($this->getThumbnailsFolder() . '/') === false) {
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$this->userView->mkdir($this->getThumbnailsFolder() . '/');
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}
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if ($this->userView->is_dir($previewPath) === false) {
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$this->userView->mkdir($previewPath);
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}
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$this->userView->file_put_contents($cachePath, $preview->data());
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break;
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}
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}
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if (is_null($this->preview)) {
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$this->preview = new \OC_Image();
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}
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return $this->preview;
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}
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/**
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* show preview
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* @return void
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*/
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public function showPreview($mimeType = null) {
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\OCP\Response::enableCaching(3600 * 24); // 24 hours
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if (is_null($this->preview)) {
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$this->getPreview();
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}
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$this->preview->show($mimeType);
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}
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/**
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* resize, crop and fix orientation
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* @return void
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*/
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private function resizeAndCrop() {
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$image = $this->preview;
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$x = $this->getMaxX();
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$y = $this->getMaxY();
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$scalingUp = $this->getScalingUp();
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$maxScaleFactor = $this->getMaxScaleFactor();
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if (!($image instanceof \OC_Image)) {
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\OC_Log::write('core', '$this->preview is not an instance of OC_Image', \OC_Log::DEBUG);
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return;
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}
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$image->fixOrientation();
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$realX = (int)$image->width();
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$realY = (int)$image->height();
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|
|
// compute $maxY and $maxX using the aspect of the generated preview
|
|
if ($this->keepAspect) {
|
|
$ratio = $realX / $realY;
|
|
if($x / $ratio < $y) {
|
|
// width restricted
|
|
$y = $x / $ratio;
|
|
} else {
|
|
$x = $y * $ratio;
|
|
}
|
|
}
|
|
|
|
if ($x === $realX && $y === $realY) {
|
|
$this->preview = $image;
|
|
return;
|
|
}
|
|
|
|
$factorX = $x / $realX;
|
|
$factorY = $y / $realY;
|
|
|
|
if ($factorX >= $factorY) {
|
|
$factor = $factorX;
|
|
} else {
|
|
$factor = $factorY;
|
|
}
|
|
|
|
if ($scalingUp === false) {
|
|
if ($factor > 1) {
|
|
$factor = 1;
|
|
}
|
|
}
|
|
|
|
if (!is_null($maxScaleFactor)) {
|
|
if ($factor > $maxScaleFactor) {
|
|
\OC_Log::write('core', 'scale factor reduced from ' . $factor . ' to ' . $maxScaleFactor, \OC_Log::DEBUG);
|
|
$factor = $maxScaleFactor;
|
|
}
|
|
}
|
|
|
|
$newXSize = (int)($realX * $factor);
|
|
$newYSize = (int)($realY * $factor);
|
|
|
|
$image->preciseResize($newXSize, $newYSize);
|
|
|
|
if ($newXSize === $x && $newYSize === $y) {
|
|
$this->preview = $image;
|
|
return;
|
|
}
|
|
|
|
if ($newXSize >= $x && $newYSize >= $y) {
|
|
$cropX = floor(abs($x - $newXSize) * 0.5);
|
|
//don't crop previews on the Y axis, this sucks if it's a document.
|
|
//$cropY = floor(abs($y - $newYsize) * 0.5);
|
|
$cropY = 0;
|
|
|
|
$image->crop($cropX, $cropY, $x, $y);
|
|
|
|
$this->preview = $image;
|
|
return;
|
|
}
|
|
|
|
if (($newXSize < $x || $newYSize < $y) && $scalingUp) {
|
|
if ($newXSize > $x) {
|
|
$cropX = floor(($newXSize - $x) * 0.5);
|
|
$image->crop($cropX, 0, $x, $newYSize);
|
|
}
|
|
|
|
if ($newYSize > $y) {
|
|
$cropY = floor(($newYSize - $y) * 0.5);
|
|
$image->crop(0, $cropY, $newXSize, $y);
|
|
}
|
|
|
|
$newXSize = (int)$image->width();
|
|
$newYSize = (int)$image->height();
|
|
|
|
//create transparent background layer
|
|
$backgroundLayer = imagecreatetruecolor($x, $y);
|
|
$white = imagecolorallocate($backgroundLayer, 255, 255, 255);
|
|
imagefill($backgroundLayer, 0, 0, $white);
|
|
|
|
$image = $image->resource();
|
|
|
|
$mergeX = floor(abs($x - $newXSize) * 0.5);
|
|
$mergeY = floor(abs($y - $newYSize) * 0.5);
|
|
|
|
imagecopy($backgroundLayer, $image, $mergeX, $mergeY, 0, 0, $newXSize, $newYSize);
|
|
|
|
//$black = imagecolorallocate(0,0,0);
|
|
//imagecolortransparent($transparentlayer, $black);
|
|
|
|
$image = new \OC_Image($backgroundLayer);
|
|
|
|
$this->preview = $image;
|
|
return;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* register a new preview provider to be used
|
|
* @param array $options
|
|
* @return void
|
|
*/
|
|
public static function registerProvider($class, $options = array()) {
|
|
self::$registeredProviders[] = array('class' => $class, 'options' => $options);
|
|
}
|
|
|
|
/**
|
|
* create instances of all the registered preview providers
|
|
* @return void
|
|
*/
|
|
private static function initProviders() {
|
|
if (!\OC_Config::getValue('enable_previews', true)) {
|
|
$provider = new Preview\Unknown(array());
|
|
self::$providers = array($provider->getMimeType() => $provider);
|
|
return;
|
|
}
|
|
|
|
if (count(self::$providers) > 0) {
|
|
return;
|
|
}
|
|
|
|
foreach (self::$registeredProviders as $provider) {
|
|
$class = $provider['class'];
|
|
$options = $provider['options'];
|
|
|
|
/** @var $object Provider */
|
|
$object = new $class($options);
|
|
|
|
self::$providers[$object->getMimeType()] = $object;
|
|
}
|
|
|
|
$keys = array_map('strlen', array_keys(self::$providers));
|
|
array_multisort($keys, SORT_DESC, self::$providers);
|
|
}
|
|
|
|
public static function post_write($args) {
|
|
self::post_delete($args, 'files/');
|
|
}
|
|
|
|
public static function prepare_delete_files($args) {
|
|
self::prepare_delete($args, 'files/');
|
|
}
|
|
|
|
public static function prepare_delete($args, $prefix='') {
|
|
$path = $args['path'];
|
|
if (substr($path, 0, 1) === '/') {
|
|
$path = substr($path, 1);
|
|
}
|
|
|
|
$view = new \OC\Files\View('/' . \OC_User::getUser() . '/' . $prefix);
|
|
$info = $view->getFileInfo($path);
|
|
|
|
\OC\Preview::$deleteFileMapper = array_merge(
|
|
\OC\Preview::$deleteFileMapper,
|
|
array(
|
|
Files\Filesystem::normalizePath($view->getAbsolutePath($path)) => $info,
|
|
)
|
|
);
|
|
}
|
|
|
|
public static function post_delete_files($args) {
|
|
self::post_delete($args, 'files/');
|
|
}
|
|
|
|
public static function post_delete($args, $prefix='') {
|
|
$path = Files\Filesystem::normalizePath($args['path']);
|
|
|
|
$preview = new Preview(\OC_User::getUser(), $prefix, $path);
|
|
$preview->deleteAllPreviews();
|
|
}
|
|
|
|
/**
|
|
* Check if a preview can be generated for a file
|
|
*
|
|
* @param \OC\Files\FileInfo $file
|
|
* @return bool
|
|
*/
|
|
public static function isAvailable($file) {
|
|
if (!\OC_Config::getValue('enable_previews', true)) {
|
|
return false;
|
|
}
|
|
|
|
//check if there are preview backends
|
|
if (empty(self::$providers)) {
|
|
self::initProviders();
|
|
}
|
|
|
|
//remove last element because it has the mimetype *
|
|
$providers = array_slice(self::$providers, 0, -1);
|
|
foreach ($providers as $supportedMimeType => $provider) {
|
|
/**
|
|
* @var \OC\Preview\Provider $provider
|
|
*/
|
|
if (preg_match($supportedMimeType, $file->getMimetype())) {
|
|
return $provider->isAvailable($file);
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* @param string $mimeType
|
|
* @return bool
|
|
*/
|
|
public static function isMimeSupported($mimeType) {
|
|
if (!\OC_Config::getValue('enable_previews', true)) {
|
|
return false;
|
|
}
|
|
|
|
//check if there are preview backends
|
|
if (empty(self::$providers)) {
|
|
self::initProviders();
|
|
}
|
|
|
|
//remove last element because it has the mimetype *
|
|
$providers = array_slice(self::$providers, 0, -1);
|
|
foreach ($providers as $supportedMimeType => $provider) {
|
|
if (preg_match($supportedMimeType, $mimeType)) {
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* @param int $fileId
|
|
* @return string
|
|
*/
|
|
private function buildCachePath($fileId) {
|
|
$maxX = $this->getMaxX();
|
|
$maxY = $this->getMaxY();
|
|
|
|
$previewPath = $this->getPreviewPath($fileId);
|
|
$preview = $previewPath . strval($maxX) . '-' . strval($maxY);
|
|
if ($this->keepAspect) {
|
|
$preview .= '-with-aspect';
|
|
}
|
|
$preview .= '.png';
|
|
|
|
return $preview;
|
|
}
|
|
|
|
|
|
/**
|
|
* @param int $fileId
|
|
* @return string
|
|
*/
|
|
private function getPreviewPath($fileId) {
|
|
return $this->getThumbnailsFolder() . '/' . $fileId . '/';
|
|
}
|
|
}
|