nextcloud/lib/preview.php

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<?php
/**
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* Copyright (c) 2013 Frank Karlitschek frank@owncloud.org
* Copyright (c) 2013 Georg Ehrke georg@ownCloud.com
* This file is licensed under the Affero General Public License version 3 or
* later.
* See the COPYING-README file.
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*
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* Thumbnails:
* structure of filename:
* /data/user/thumbnails/pathhash/x-y.png
*
*/
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require_once('preview/images.php');
require_once('preview/movies.php');
require_once('preview/mp3.php');
require_once('preview/pdf.php');
require_once('preview/unknown.php');
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class OC_Preview {
//the thumbnail folder
const THUMBNAILS_FOLDER = 'thumbnails';
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//config
private $max_scale_factor;
private $max_x;
private $max_y;
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//fileview object
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private $fileview = null;
private $userview = null;
//vars
private $file;
private $maxX;
private $maxY;
private $scalingup;
private $preview;
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//preview providers
static private $providers = array();
static private $registeredProviders = array();
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/**
* @brief check if thumbnail or bigger version of thumbnail of file is cached
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* @param $user userid
* @param $root path of root
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* @param $file The path to the file where you want a thumbnail from
* @param $maxX The maximum X size of the thumbnail. It can be smaller depending on the shape of the image
* @param $maxY The maximum Y size of the thumbnail. It can be smaller depending on the shape of the image
* @return mixed (bool / string)
* false if thumbnail does not exist
* path to thumbnail if thumbnail exists
*/
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public function __construct($user = null, $root = '', $file = '', $maxX = 0, $maxY = 0, $scalingup = true){
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//set config
$this->max_x = OC_Config::getValue('preview_max_x', null);
$this->max_y = OC_Config::getValue('preview_max_y', null);
$this->max_scale_factor = OC_Config::getValue('preview_max_scale_factor', 10);
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//save parameters
$this->file = $file;
$this->maxX = $maxX;
$this->maxY = $maxY;
$this->scalingup = $scalingup;
//init fileviews
$this->fileview = new \OC\Files\View('/' . $user . '/' . $root);
$this->userview = new \OC\Files\View('/' . $user);
if(!is_null($this->max_x)){
if($this->maxX > $this->max_x){
OC_Log::write('core', 'maxX reduced from ' . $this->maxX . ' to ' . $this->max_x, OC_Log::DEBUG);
$this->maxX = $this->max_x;
}
}
if(!is_null($this->max_y)){
if($this->maxY > $this->max_y){
OC_Log::write('core', 'maxY reduced from ' . $this->maxY . ' to ' . $this->max_y, OC_Log::DEBUG);
$this->maxY = $this->max_y;
}
}
//init providers
if(empty(self::$providers)){
self::initProviders();
}
//check if there are any providers at all
if(empty(self::$providers)){
OC_Log::write('core', 'No preview providers exist', OC_Log::ERROR);
throw new Exception('No providers');
}
//validate parameters
if($file === ''){
OC_Log::write('core', 'No filename passed', OC_Log::ERROR);
throw new Exception('File not found');
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}
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//check if file exists
if(!$this->fileview->file_exists($file)){
OC_Log::write('core', 'File:"' . $file . '" not found', OC_Log::ERROR);
throw new Exception('File not found');
}
//check if given size makes sense
if($maxX === 0 || $maxY === 0){
OC_Log::write('core', 'Can not create preview with 0px width or 0px height', OC_Log::ERROR);
throw new Exception('Height and/or width set to 0');
}
}
/**
* @brief returns the path of the file you want a thumbnail from
* @return string
*/
public function getFile(){
return $this->file;
}
/**
* @brief returns the max width of the preview
* @return integer
*/
public function getMaxX(){
return $this->maxX;
}
/**
* @brief returns the max height of the preview
* @return integer
*/
public function getMaxY(){
return $this->maxY;
}
/**
* @brief returns whether or not scalingup is enabled
* @return bool
*/
public function getScalingup(){
return $this->scalingup;
}
/**
* @brief returns the name of the thumbnailfolder
* @return string
*/
public function getThumbnailsfolder(){
return self::THUMBNAILS_FOLDER;
}
/**
* @brief returns the max scale factor
* @return integer
*/
public function getMaxScaleFactor(){
return $this->max_scale_factor;
}
/**
* @brief returns the max width set in ownCloud's config
* @return integer
*/
public function getConfigMaxX(){
return $this->max_x;
}
/**
* @brief returns the max height set in ownCloud's config
* @return integer
*/
public function getConfigMaxY(){
return $this->max_y;
}
/**
* @brief deletes previews of a file with specific x and y
* @return bool
*/
public function deletePreview(){
$fileinfo = $this->fileview->getFileInfo($this->file);
$fileid = $fileinfo['fileid'];
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return $this->userview->unlink(self::THUMBNAILS_FOLDER . '/' . $fileid . '/' . $this->maxX . '-' . $this->maxY . '.png');
}
/**
* @brief deletes all previews of a file
* @return bool
*/
public function deleteAllPrevies(){
$fileinfo = $this->fileview->getFileInfo($this->file);
$fileid = $fileinfo['fileid'];
return $this->userview->rmdir(self::THUMBNAILS_FOLDER . '/' . $fileid);
}
/**
* @brief check if thumbnail or bigger version of thumbnail of file is cached
* @return mixed (bool / string)
* false if thumbnail does not exist
* path to thumbnail if thumbnail exists
*/
private function isCached(){
$file = $this->file;
$maxX = $this->maxX;
$maxY = $this->maxY;
$scalingup = $this->scalingup;
$fileinfo = $this->fileview->getFileInfo($file);
$fileid = $fileinfo['fileid'];
if(!$this->userview->is_dir(self::THUMBNAILS_FOLDER . '/' . $fileid)){
return false;
}
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//does a preview with the wanted height and width already exist?
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if($this->userview->file_exists(self::THUMBNAILS_FOLDER . '/' . $fileid . '/' . $maxX . '-' . $maxY . '.png')){
return self::THUMBNAILS_FOLDER . '/' . $fileid . '/' . $maxX . '-' . $maxY . '.png';
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}
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$wantedaspectratio = $maxX / $maxY;
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//array for usable cached thumbnails
$possiblethumbnails = array();
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$allthumbnails = $this->userview->getDirectoryContent(self::THUMBNAILS_FOLDER . '/' . $fileid);
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foreach($allthumbnails as $thumbnail){
$size = explode('-', $thumbnail['name']);
$x = $size[0];
$y = $size[1];
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$aspectratio = $x / $y;
if($aspectratio != $wantedaspectratio){
continue;
}
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if($x < $maxX || $y < $maxY){
if($scalingup){
$scalefactor = $maxX / $x;
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if($scalefactor > $this->max_scale_factor){
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continue;
}
}else{
continue;
}
}
$possiblethumbnails[$x] = $thumbnail['path'];
}
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if(count($possiblethumbnails) === 0){
return false;
}
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if(count($possiblethumbnails) === 1){
return current($possiblethumbnails);
}
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ksort($possiblethumbnails);
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if(key(reset($possiblethumbnails)) > $maxX){
return current(reset($possiblethumbnails));
}
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if(key(end($possiblethumbnails)) < $maxX){
return current(end($possiblethumbnails));
}
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foreach($possiblethumbnails as $width => $path){
if($width < $maxX){
continue;
}else{
return $path;
}
}
}
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/**
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* @brief return a preview of a file
* @param $file The path to the file where you want a thumbnail from
* @param $maxX The maximum X size of the thumbnail. It can be smaller depending on the shape of the image
* @param $maxY The maximum Y size of the thumbnail. It can be smaller depending on the shape of the image
* @param $scaleup Scale smaller images up to the thumbnail size or not. Might look ugly
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* @return image
*/
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public function getPreview(){
$file = $this->file;
$maxX = $this->maxX;
$maxY = $this->maxY;
$scalingup = $this->scalingup;
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$fileinfo = $this->fileview->getFileInfo($file);
$fileid = $fileinfo['fileid'];
$cached = self::isCached();
if($cached){
$image = new \OC_Image($this->userview->getLocalFile($cached));
$this->preview = $image;
}else{
$mimetype = $this->fileview->getMimeType($file);
$preview;
foreach(self::$providers as $supportedmimetype => $provider){
if(!preg_match($supportedmimetype, $mimetype)){
continue;
}
$preview = $provider->getThumbnail($file, $maxX, $maxY, $scalingup, $this->fileview);
if(!$preview){
continue;
}
if(!($preview instanceof \OC_Image)){
$preview = @new \OC_Image($preview);
}
//cache thumbnail
$preview->save($this->userview->getLocalFile(self::THUMBNAILS_FOLDER . '/' . $fileid . '/' . $maxX . '-' . $maxY . '.png'));
break;
}
$this->preview = $preview;
}
$this->resizeAndCrop();
return $this->preview;
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}
/**
* @brief return a preview of a file
* @param $file The path to the file where you want a thumbnail from
* @param $maxX The maximum X size of the thumbnail. It can be smaller depending on the shape of the image
* @param $maxY The maximum Y size of the thumbnail. It can be smaller depending on the shape of the image
* @param $scaleup Scale smaller images up to the thumbnail size or not. Might look ugly
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* @return void
*/
public function showPreview(){
OCP\Response::enableCaching(3600 * 24); // 24 hour
$preview = $this->getPreview();
if($preview){
$preview->show();
}
}
/**
* @brief resize, crop and fix orientation
* @return image
*/
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public function resizeAndCrop(){
$image = $this->preview;
$x = $this->maxX;
$y = $this->maxY;
$scalingup = $this->scalingup;
$image->fixOrientation();
if(!($image instanceof \OC_Image)){
OC_Log::write('core', 'Object passed to resizeAndCrop is not an instance of OC_Image', OC_Log::DEBUG);
return;
}
$realx = (int) $image->width();
$realy = (int) $image->height();
if($x === $realx && $y === $realy){
return $image;
}
$factorX = $x / $realx;
$factorY = $y / $realy;
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if($factorX >= $factorY){
$factor = $factorX;
}else{
$factor = $factorY;
}
// only scale up if requested
if($scalingup === false) {
if($factor>1) $factor=1;
}
if(!is_null($this->max_scale_factor)){
if($factor > $this->max_scale_factor){
OC_Log::write('core', 'scalefactor reduced from ' . $factor . ' to ' . $this->max_scale_factor, OC_Log::DEBUG);
$factor = $this->max_scale_factor;
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}
}
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$newXsize = $realx * $factor;
$newYsize = $realy * $factor;
// resize
$image->preciseResize($newXsize, $newYsize);
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if($newXsize === $x && $newYsize === $y){
$this->preview = $image;
return;
}
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if($newXsize >= $x && $newYsize >= $y){
$cropX = floor(abs($x - $newXsize) * 0.5);
$cropY = floor(abs($y - $newYsize) * 0.5);
$image->crop($cropX, $cropY, $x, $y);
$this->preview = $image;
return;
}
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if($newXsize < $x || $newYsize < $y){
if($newXsize > $x){
$cropX = floor(($newXsize - $x) * 0.5);
$image->crop($cropX, 0, $x, $newYsize);
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}
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if($newYsize > $y){
$cropY = floor(($newYsize - $y) * 0.5);
$image->crop(0, $cropY, $newXsize, $y);
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}
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$newXsize = (int) $image->width();
$newYsize = (int) $image->height();
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//create transparent background layer
$backgroundlayer = imagecreatetruecolor($x, $y);
$white = imagecolorallocate($backgroundlayer, 255, 255, 255);
imagefill($backgroundlayer, 0, 0, $white);
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$image = $image->resource();
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$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, $black);
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$image = new \OC_Image($backgroundlayer);
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$this->preview = $image;
return;
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}
}
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/**
* @brief register a new preview provider to be used
* @param string $provider class name of a OC_Preview_Provider
* @return void
*/
public static function registerProvider($class, $options=array()){
self::$registeredProviders[]=array('class'=>$class, 'options'=>$options);
}
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/**
* @brief create instances of all the registered preview providers
* @return void
*/
private static function initProviders(){
if(count(self::$providers)>0) {
return;
}
foreach(self::$registeredProviders as $provider) {
$class=$provider['class'];
$options=$provider['options'];
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$object = new $class($options);
self::$providers[$object->getMimeType()] = $object;
}
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$keys = array_map('strlen', array_keys(self::$providers));
array_multisort($keys, SORT_DESC, self::$providers);
}
/**
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* @brief method that handles preview requests from users that are logged in
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* @return void
*/
public static function previewRouter($params){
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OC_Util::checkLoggedIn();
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$file = '';
$maxX = 0;
$maxY = 0;
/*
* use: ?scalingup=0 / ?scalingup = 1
* do not use ?scalingup=false / ?scalingup = true as these will always be true
*/
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$scalingup = true;
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if(array_key_exists('file', $_GET)) $file = (string) urldecode($_GET['file']);
if(array_key_exists('x', $_GET)) $maxX = (int) $_GET['x'];
if(array_key_exists('y', $_GET)) $maxY = (int) $_GET['y'];
if(array_key_exists('scalingup', $_GET)) $scalingup = (bool) $_GET['scalingup'];
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if($file !== '' && $maxX !== 0 && $maxY !== 0){
$preview = new OC_Preview(OC_User::getUser(), 'files', $file, $maxX, $maxY, $scalingup);
$preview->showPreview();
}else{
OC_Response::setStatus(404);
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exit;
}
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}
/**
* @brief method that handles preview requests from users that are not logged in / view shared folders that are public
* @return void
*/
public static function publicPreviewRouter($params){
$file = '';
$maxX = 0;
$maxY = 0;
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$scalingup = true;
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$token = '';
$user = null;
$path = null;
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if(array_key_exists('file', $_GET)) $file = (string) urldecode($_GET['file']);
if(array_key_exists('x', $_GET)) $maxX = (int) $_GET['x'];
if(array_key_exists('y', $_GET)) $maxY = (int) $_GET['y'];
if(array_key_exists('scalingup', $_GET)) $scalingup = (bool) $_GET['scalingup'];
if(array_key_exists('t', $_GET)) $token = (string) $_GET['t'];
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$linkItem = OCP\Share::getShareByToken($token);
if (is_array($linkItem) && isset($linkItem['uid_owner']) && isset($linkItem['file_source'])) {
$userid = $linkItem['uid_owner'];
OC_Util::setupFS($fileOwner);
$path = $linkItem['file_source'];
}
if($user !== null && $path !== null){
$preview = new OC_Preview($userid, $path, $file, $maxX, $maxY, $scalingup);
$preview->showPreview();
}else{
OC_Response::setStatus(404);
exit;
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}
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}
}