631 lines
15 KiB
PHP
Executable File
631 lines
15 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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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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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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//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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* @brief 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 $scalingUp Disable/Enable upscaling of previews
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* @return mixed (bool / string)
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* false if thumbnail does not exist
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* path to thumbnail if thumbnail exists
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*/
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public function __construct($user='', $root='/', $file='', $maxX=1, $maxY=1, $scalingUp=true) {
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//set config
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$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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//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('/' . $user);
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$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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}
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/**
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* @brief 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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* @brief 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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* @brief 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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* @brief 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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* @brief 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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* @brief returns the max scale factor
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* @return integer
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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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* @brief returns the max width set in ownCloud's config
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* @return integer
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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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* @brief returns the max height set in ownCloud's config
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* @return integer
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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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* @brief set the path of the file you want a thumbnail from
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* @param string $file
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* @return $this
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*/
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public function setFile($file) {
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$this->file = $file;
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return $this;
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}
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/**
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* @brief set the the max width of the preview
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* @param int $maxX
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* @return $this
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*/
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public function setMaxX($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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* @brief set the the max height of the preview
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* @param int $maxY
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* @return $this
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*/
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public function setMaxY($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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* @brief set whether or not scalingup is enabled
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* @param bool $scalingUp
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* @return $this
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*/
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public function setScalingup($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 $this;
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}
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/**
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* @brief check if all parameters are valid
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* @return bool
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*/
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public function isFileValid() {
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$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:"' . $file . '" not found', \OC_Log::DEBUG);
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return false;
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}
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return true;
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}
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/**
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* @brief deletes previews of a file with specific x and y
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* @return bool
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*/
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public function deletePreview() {
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$file = $this->getFile();
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$fileInfo = $this->fileView->getFileInfo($file);
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$fileId = $fileInfo['fileid'];
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$previewPath = $this->getThumbnailsFolder() . '/' . $fileId . '/' . $this->getMaxX() . '-' . $this->getMaxY() . '.png';
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$this->userView->unlink($previewPath);
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return !$this->userView->file_exists($previewPath);
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}
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/**
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* @brief deletes all previews of a file
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* @return bool
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*/
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public function deleteAllPreviews() {
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$file = $this->getFile();
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$fileInfo = $this->fileView->getFileInfo($file);
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$fileId = $fileInfo['fileid'];
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$previewPath = $this->getThumbnailsFolder() . '/' . $fileId . '/';
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$this->userView->deleteAll($previewPath);
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$this->userView->rmdir($previewPath);
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return !$this->userView->is_dir($previewPath);
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}
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/**
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* @brief check if thumbnail or bigger version of thumbnail of file is cached
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* @return mixed (bool / string)
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* false if thumbnail does not exist
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* path to thumbnail if thumbnail exists
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*/
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private function isCached() {
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$file = $this->getFile();
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$maxX = $this->getMaxX();
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$maxY = $this->getMaxY();
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$scalingUp = $this->getScalingUp();
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$maxScaleFactor = $this->getMaxScaleFactor();
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$fileInfo = $this->fileView->getFileInfo($file);
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$fileId = $fileInfo['fileid'];
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if(is_null($fileId)) {
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return false;
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}
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$previewPath = $this->getThumbnailsFolder() . '/' . $fileId . '/';
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if(!$this->userView->is_dir($previewPath)) {
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return false;
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}
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//does a preview with the wanted height and width already exist?
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if($this->userView->file_exists($previewPath . $maxX . '-' . $maxY . '.png')) {
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return $previewPath . $maxX . '-' . $maxY . '.png';
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}
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$wantedAspectRatio = (float) ($maxX / $maxY);
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//array for usable cached thumbnails
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$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($thumbnail['name'], '.png');
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$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 / $y);
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if($aspectRatio !== $wantedAspectRatio) {
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continue;
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}
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if($x < $maxX || $y < $maxY) {
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if($scalingUp) {
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$scalefactor = $maxX / $x;
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if($scalefactor > $maxScaleFactor) {
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continue;
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}
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}else{
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continue;
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}
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}
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$possibleThumbnails[$x] = $thumbnail['path'];
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}
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if(count($possibleThumbnails) === 0) {
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return false;
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}
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if(count($possibleThumbnails) === 1) {
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return current($possibleThumbnails);
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}
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ksort($possibleThumbnails);
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if(key(reset($possibleThumbnails)) > $maxX) {
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return current(reset($possibleThumbnails));
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}
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if(key(end($possibleThumbnails)) < $maxX) {
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return current(end($possibleThumbnails));
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}
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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 $path;
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}
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}
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}
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/**
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* @brief return a preview of a file
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* @return \OC_Image
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*/
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public function getPreview() {
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if(!is_null($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 = $this->fileView->getFileInfo($file);
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$fileId = $fileInfo['fileid'];
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$cached = $this->isCached();
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if($cached) {
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$image = new \OC_Image($this->userView->file_get_contents($cached, 'r'));
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$this->preview = $image->valid() ? $image : null;
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$this->resizeAndCrop();
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}
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if(is_null($this->preview)) {
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$mimetype = $this->fileView->getMimeType($file);
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$preview = null;
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foreach(self::$providers as $supportedMimetype => $provider) {
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if(!preg_match($supportedMimetype, $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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$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->getThumbnailsFolder() . '/' . $fileId . '/';
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$cachePath = $previewPath . $maxX . '-' . $maxY . '.png';
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if($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 $this->preview;
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}
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/**
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* @brief show preview
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* @return void
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*/
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public function showPreview() {
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\OCP\Response::enableCaching(3600 * 24); // 24 hours
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if(is_null($this->preview)) {
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$this->getPreview();
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}
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$this->preview->show();
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return;
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}
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/**
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* @brief show preview
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* @return void
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*/
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public function show() {
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$this->showPreview();
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return;
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}
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/**
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* @brief resize, crop and fix orientation
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* @return void
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*/
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private function resizeAndCrop() {
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$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) $image->height();
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if($x === $realx && $y === $realy) {
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$this->preview = $image;
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return;
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}
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$factorX = $x / $realx;
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$factorY = $y / $realy;
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if($factorX >= $factorY) {
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$factor = $factorX;
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}else{
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$factor = $factorY;
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}
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if($scalingUp === false) {
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if($factor > 1) {
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$factor = 1;
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}
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}
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if(!is_null($maxscalefactor)) {
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if($factor > $maxscalefactor) {
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\OC_Log::write('core', 'scalefactor reduced from ' . $factor . ' to ' . $maxscalefactor, \OC_Log::DEBUG);
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$factor = $maxscalefactor;
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}
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}
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$newXsize = (int) ($realx * $factor);
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$newYsize = (int) ($realy * $factor);
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$image->preciseResize($newXsize, $newYsize);
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if($newXsize === $x && $newYsize === $y) {
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$this->preview = $image;
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return;
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}
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if($newXsize >= $x && $newYsize >= $y) {
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$cropX = floor(abs($x - $newXsize) * 0.5);
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//don't crop previews on the Y axis, this sucks if it's a document.
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//$cropY = floor(abs($y - $newYsize) * 0.5);
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$cropY = 0;
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$image->crop($cropX, $cropY, $x, $y);
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$this->preview = $image;
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return;
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}
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if($newXsize < $x || $newYsize < $y) {
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if($newXsize > $x) {
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$cropX = floor(($newXsize - $x) * 0.5);
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$image->crop($cropX, 0, $x, $newYsize);
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}
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if($newYsize > $y) {
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$cropY = floor(($newYsize - $y) * 0.5);
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$image->crop(0, $cropY, $newXsize, $y);
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}
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$newXsize = (int) $image->width();
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$newYsize = (int) $image->height();
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//create transparent background layer
|
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$backgroundlayer = imagecreatetruecolor($x, $y);
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$white = imagecolorallocate($backgroundlayer, 255, 255, 255);
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imagefill($backgroundlayer, 0, 0, $white);
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$image = $image->resource();
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$mergeX = floor(abs($x - $newXsize) * 0.5);
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$mergeY = floor(abs($y - $newYsize) * 0.5);
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imagecopy($backgroundlayer, $image, $mergeX, $mergeY, 0, 0, $newXsize, $newYsize);
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//$black = imagecolorallocate(0,0,0);
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//imagecolortransparent($transparentlayer, $black);
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|
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$image = new \OC_Image($backgroundlayer);
|
|
|
|
$this->preview = $image;
|
|
return;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief register a new preview provider to be used
|
|
* @param string $provider class name of a Preview_Provider
|
|
* @param array $options
|
|
* @return void
|
|
*/
|
|
public static function registerProvider($class, $options=array()) {
|
|
self::$registeredProviders[]=array('class'=>$class, 'options'=>$options);
|
|
}
|
|
|
|
/**
|
|
* @brief 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'];
|
|
|
|
$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);
|
|
}
|
|
|
|
public static function post_delete($args) {
|
|
$path = $args['path'];
|
|
if(substr($path, 0, 1) === '/') {
|
|
$path = substr($path, 1);
|
|
}
|
|
$preview = new Preview(\OC_User::getUser(), 'files/', $path);
|
|
$preview->deleteAllPreviews();
|
|
}
|
|
|
|
public static function isMimeSupported($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;
|
|
}
|
|
}
|