forked from GNUsocial/gnu-social
b224d93098
Default supported files need to use consistent names. Bumped version to 1.20.0 ImageFile has been changed to extend MediaFile and rely on it to partially validate files. This validation has been extended to not rely solely on Fileinfo, as it is disabled on some places. Now it'll try to use the shell command `file`, if Fileinfo isn't available. ImageFile now converts every new upload to PNG, except JPEG and GIF, which are kept, but still resized (to the same size), to remove possible scripts embedded therein. MediaFile::fromUpload will return an ImageFile if the uploaded file is an image or a MediaFile otherwise. MediaFile can be constructed with an id with value -1 to denote a temporary object, which is not added to the DB. This is useful to create a temporary object for representing images, so it can be used to rescale them. The supported attachment array needs to be populated with the result of calling `image_type_to_extension` for the appropriate image type, in the case of images. This is important so all parts of the code see the same extension for each image type (jpg vs jpeg). Added documentation to classes/File.php and to lib/MediaFile and lib/ImageFile
590 lines
23 KiB
PHP
590 lines
23 KiB
PHP
<?php
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/**
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* GNU social - a federating social network
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*
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* Abstraction for an image file
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*
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* LICENCE: This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* @category Image
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* @package GNUsocial
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* @author Evan Prodromou <evan@status.net>
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* @author Zach Copley <zach@status.net>
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* @author Mikael Nordfeldth <mmn@hethane.se>
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* @author Miguel Dantas <biodantasgs@gmail.com>
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* @copyright 2008, 2019 Free Software Foundation http://fsf.org
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* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
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* @link https://www.gnu.org/software/social/
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*/
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defined('GNUSOCIAL') || die();
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/**
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* A wrapper on uploaded images
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*
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* Makes it slightly easier to accept an image file from upload.
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*
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* @category Image
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* @package GNUsocial
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* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
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* @author Evan Prodromou <evan@status.net>
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* @author Zach Copley <zach@status.net>
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* @link https://www.gnu.org/software/social/
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*/
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class ImageFile extends MediaFile
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{
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public $type;
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public $height;
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public $width;
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public $rotate = 0; // degrees to rotate for properly oriented image (extrapolated from EXIF etc.)
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public $animated = null; // Animated image? (has more than 1 frame). null means untested
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public $mimetype = null; // The _ImageFile_ mimetype, _not_ the originating File object
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public function __construct($id, string $filepath)
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{
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// These do not have to be the same as fileRecord->filename for example,
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// since we may have generated an image source file from something else!
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$this->filepath = $filepath;
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$this->filename = basename($filepath);
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$info = @getimagesize($this->filepath);
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if (!(($info[2] == IMAGETYPE_GIF && function_exists('imagecreatefromgif')) ||
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($info[2] == IMAGETYPE_JPEG && function_exists('imagecreatefromjpeg')) ||
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($info[2] == IMAGETYPE_BMP && function_exists('imagecreatefrombmp')) ||
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($info[2] == IMAGETYPE_WBMP && function_exists('imagecreatefromwbmp')) ||
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($info[2] == IMAGETYPE_XBM && function_exists('imagecreatefromxbm')) ||
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($info[2] == IMAGETYPE_PNG && function_exists('imagecreatefrompng')))) {
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// TRANS: Exception thrown when trying to upload an unsupported image file format.
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throw new UnsupportedMediaException(_m('Unsupported image format.'), $this->filepath);
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}
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$this->width = $info[0];
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$this->height = $info[1];
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$this->type = $info[2];
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$this->mimetype = $info['mime'];
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parent::__construct(
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$filepath,
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$this->mimetype,
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null /* filehash, MediaFile will calculate it */,
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$id
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);
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if ($this->type === IMAGETYPE_JPEG && function_exists('exif_read_data')) {
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// Orientation value to rotate thumbnails properly
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$exif = @exif_read_data($this->filepath);
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if (is_array($exif) && isset($exif['Orientation'])) {
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switch (intval($exif['Orientation'])) {
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case 1: // top is top
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$this->rotate = 0;
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break;
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case 3: // top is bottom
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$this->rotate = 180;
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break;
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case 6: // top is right
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$this->rotate = -90;
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break;
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case 8: // top is left
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$this->rotate = 90;
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break;
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}
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// If we ever write this back, Orientation should be set to '1'
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}
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} elseif ($this->type === IMAGETYPE_GIF) {
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$this->animated = $this->isAnimatedGif();
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}
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Event::handle('FillImageFileMetadata', array($this));
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}
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public static function fromFileObject(File $file)
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{
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$imgPath = null;
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$media = common_get_mime_media($file->mimetype);
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if (Event::handle('CreateFileImageThumbnailSource', array($file, &$imgPath, $media))) {
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if (empty($file->filename) && !file_exists($imgPath)) {
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throw new UnsupportedMediaException(_m('File without filename could not get a thumbnail source.'));
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}
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// First some mimetype specific exceptions
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switch ($file->mimetype) {
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case 'image/svg+xml':
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throw new UseFileAsThumbnailException($file);
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}
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// And we'll only consider it an image if it has such a media type
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switch ($media) {
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case 'image':
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$imgPath = $file->getPath();
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break;
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default:
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throw new UnsupportedMediaException(_m('Unsupported media format.'), $file->getPath());
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}
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}
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if (!file_exists($imgPath)) {
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throw new FileNotFoundException($imgPath);
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}
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try {
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$image = new ImageFile($file->getID(), $imgPath);
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} catch (Exception $e) {
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// Avoid deleting the original
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try {
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if (strlen($imgPath) > 0 && $imgPath !== $file->getPath()) {
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common_debug(__METHOD__.': Deleting temporary file that was created as image file' .
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'thumbnail source: '._ve($imgPath));
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@unlink($imgPath);
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}
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} catch (FileNotFoundException $e) {
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// File reported (via getPath) that the original file
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// doesn't exist anyway, so it's safe to delete $imgPath
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@unlink($imgPath);
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}
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common_debug(sprintf('Exception %s caught when creating ImageFile for File id==%s ' .
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'and imgPath==%s: %s', get_class($e), _ve($file->id),
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_ve($imgPath), _ve($e->getMessage())));
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throw $e;
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}
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return $image;
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}
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public function getPath()
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{
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if (!file_exists($this->filepath)) {
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throw new FileNotFoundException($this->filepath);
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}
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return $this->filepath;
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}
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/**
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* Process a file upload
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*
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* Uses MediaFile's `fromUpload` to do the majority of the work and reencodes the image,
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* to mitigate injection attacks.
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* @param string $param
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* @param Profile|null $scoped
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* @return ImageFile|MediaFile
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* @throws ClientException
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* @throws NoResultException
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* @throws NoUploadedMediaException
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* @throws ServerException
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* @throws UnsupportedMediaException
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* @throws UseFileAsThumbnailException
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*/
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public static function fromUpload(string $param='upload', Profile $scoped = null)
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{
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return parent::fromUpload($param, $scoped);
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}
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/**
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* Several obscure file types should be normalized to PNG on resize.
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*
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* Keeps only PNG, JPEG and GIF
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*
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* @return int
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*/
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public function preferredType()
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{
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// Keep only JPEG and GIF in their orignal format
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if ($this->type === IMAGETYPE_JPEG || $this->type === IMAGETYPE_GIF) {
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return $this->type;
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}
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// We don't want to save some formats as they are rare, inefficient and antiquated
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// thus we can't guarantee clients will support
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// So just save it as PNG
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return IMAGETYPE_PNG;
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}
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/**
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* Copy the image file to the given destination.
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*
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* This function may modify the resulting file. Please use the
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* returned ImageFile object to read metadata (width, height etc.)
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*
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* @param string $outpath
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* @return ImageFile the image stored at target path
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* @throws ClientException
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* @throws NoResultException
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* @throws ServerException
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* @throws UnsupportedMediaException
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* @throws UseFileAsThumbnailException
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*/
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function copyTo($outpath)
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{
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return new ImageFile(null, $this->resizeTo($outpath));
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}
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/**
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* Create and save a thumbnail image.
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*
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* @param string $outpath
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* @param array $box width, height, boundary box (x,y,w,h) defaults to full image
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* @return string full local filesystem filename
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* @throws UnsupportedMediaException
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* @throws UseFileAsThumbnailException
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*/
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function resizeTo($outpath, array $box=array())
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{
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$box['width'] = isset($box['width']) ? intval($box['width']) : $this->width;
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$box['height'] = isset($box['height']) ? intval($box['height']) : $this->height;
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$box['x'] = isset($box['x']) ? intval($box['x']) : 0;
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$box['y'] = isset($box['y']) ? intval($box['y']) : 0;
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$box['w'] = isset($box['w']) ? intval($box['w']) : $this->width;
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$box['h'] = isset($box['h']) ? intval($box['h']) : $this->height;
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if (!file_exists($this->filepath)) {
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// TRANS: Exception thrown during resize when image has been registered as present, but is no longer there.
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throw new Exception(_m('Lost our file.'));
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}
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// Don't rotate/crop/scale if it isn't necessary
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if ($box['width'] === $this->width
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&& $box['height'] === $this->height
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&& $box['x'] === 0
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&& $box['y'] === 0
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&& $box['w'] === $this->width
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&& $box['h'] === $this->height
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&& $this->type === $this->preferredType()) {
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if (abs($this->rotate) == 90) {
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// Box is rotated 90 degrees in either direction,
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// so we have to redefine x to y and vice versa.
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$tmp = $box['width'];
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$box['width'] = $box['height'];
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$box['height'] = $tmp;
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$tmp = $box['x'];
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$box['x'] = $box['y'];
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$box['y'] = $tmp;
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$tmp = $box['w'];
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$box['w'] = $box['h'];
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$box['h'] = $tmp;
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}
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}
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if (Event::handle('StartResizeImageFile', array($this, $outpath, $box))) {
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$this->resizeToFile($outpath, $box);
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}
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if (!file_exists($outpath)) {
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if ($this->fileRecord instanceof File) {
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throw new UseFileAsThumbnailException($this->fileRecord);
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} else {
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throw new UnsupportedMediaException('No local File object exists for ImageFile.');
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}
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}
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return $outpath;
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}
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/**
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* Resizes a file. If $box is omitted, the size is not changed, but this is still useful,
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* because it will reencode the image in the `self::prefferedType()` format. This only
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* applies henceforward, not retroactively
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*
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* Increases the 'memory_limit' to the one in the 'attachments' section in the config, to
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* enable the handling of bigger images, which can cause a peak of memory consumption, while
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* encoding
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* @param $outpath
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* @param array $box
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* @throws Exception
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*/
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protected function resizeToFile($outpath, array $box)
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{
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$old_limit = ini_set('memory_limit', common_config('attachments', 'memory_limit'));
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$image_src = null;
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switch ($this->type) {
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case IMAGETYPE_GIF:
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$image_src = imagecreatefromgif($this->filepath);
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break;
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case IMAGETYPE_JPEG:
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$image_src = imagecreatefromjpeg($this->filepath);
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break;
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case IMAGETYPE_PNG:
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$image_src = imagecreatefrompng($this->filepath);
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break;
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case IMAGETYPE_BMP:
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$image_src = imagecreatefrombmp($this->filepath);
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break;
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case IMAGETYPE_WBMP:
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$image_src = imagecreatefromwbmp($this->filepath);
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break;
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case IMAGETYPE_XBM:
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$image_src = imagecreatefromxbm($this->filepath);
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break;
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default:
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// TRANS: Exception thrown when trying to resize an unknown file type.
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throw new Exception(_m('Unknown file type'));
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}
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if ($this->rotate != 0) {
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$image_src = imagerotate($image_src, $this->rotate, 0);
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}
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$image_dest = imagecreatetruecolor($box['width'], $box['height']);
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if ($this->type == IMAGETYPE_PNG || $this->type == IMAGETYPE_BMP) {
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$transparent_idx = imagecolortransparent($image_src);
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if ($transparent_idx >= 0 && $transparent_idx < 255) {
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$transparent_color = imagecolorsforindex($image_src, $transparent_idx);
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$transparent_idx = imagecolorallocate($image_dest, $transparent_color['red'],
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$transparent_color['green'],
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$transparent_color['blue']);
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imagefill($image_dest, 0, 0, $transparent_idx);
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imagecolortransparent($image_dest, $transparent_idx);
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} elseif ($this->type == IMAGETYPE_PNG) {
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imagealphablending($image_dest, false);
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$transparent = imagecolorallocatealpha($image_dest, 0, 0, 0, 127);
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imagefill($image_dest, 0, 0, $transparent);
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imagesavealpha($image_dest, true);
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}
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}
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imagecopyresampled($image_dest, $image_src, 0, 0, $box['x'], $box['y'],
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$box['width'], $box['height'], $box['w'], $box['h']);
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$type = $this->preferredType();
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$ext = image_type_to_extension($type, true);
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$outpath = preg_replace("/\.[^\.]+$/", $ext, $outpath);
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switch ($type) {
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case IMAGETYPE_GIF:
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imagegif($image_dest, $outpath);
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break;
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case IMAGETYPE_JPEG:
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imagejpeg($image_dest, $outpath, common_config('image', 'jpegquality'));
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break;
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case IMAGETYPE_PNG:
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imagepng($image_dest, $outpath);
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break;
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default:
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// TRANS: Exception thrown when trying resize an unknown file type.
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throw new Exception(_m('Unknown file type'));
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}
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imagedestroy($image_src);
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imagedestroy($image_dest);
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ini_set('memory_limit', $old_limit); // Restore the old memory limit
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}
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public function unlink()
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{
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@unlink($this->filepath);
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}
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public function scaleToFit($maxWidth=null, $maxHeight=null, $crop=null)
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{
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return self::getScalingValues($this->width, $this->height,
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$maxWidth, $maxHeight, $crop, $this->rotate);
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}
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/**
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* Gets scaling values for images of various types. Cropping can be enabled.
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*
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* Values will scale _up_ to fit max values if cropping is enabled!
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* With cropping disabled, the max value of each axis will be respected.
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*
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* @param $width int Original width
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* @param $height int Original height
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* @param $maxW int Resulting max width
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* @param $maxH int Resulting max height
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* @param $crop int Crop to the size (not preserving aspect ratio)
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* @param int $rotate
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* @return array
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* @throws ServerException
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*/
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public static function getScalingValues($width, $height,
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$maxW=null, $maxH=null,
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$crop=null, $rotate=0)
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{
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$maxW = $maxW ?: common_config('thumbnail', 'width');
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$maxH = $maxH ?: common_config('thumbnail', 'height');
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if ($maxW < 1 || ($maxH !== null && $maxH < 1)) {
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throw new ServerException('Bad parameters for ImageFile::getScalingValues');
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} elseif ($maxH === null) {
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// if maxH is null, we set maxH to equal maxW and enable crop
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$maxH = $maxW;
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$crop = true;
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}
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// Because GD doesn't understand EXIF orientation etc.
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if (abs($rotate) == 90) {
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$tmp = $width;
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$width = $height;
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$height = $tmp;
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}
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// Cropping data (for original image size). Default values, 0 and null,
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// imply no cropping and with preserved aspect ratio (per axis).
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$cx = 0; // crop x
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$cy = 0; // crop y
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$cw = null; // crop area width
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$ch = null; // crop area height
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if ($crop) {
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$s_ar = $width / $height;
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$t_ar = $maxW / $maxH;
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$rw = $maxW;
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$rh = $maxH;
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// Source aspect ratio differs from target, recalculate crop points!
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if ($s_ar > $t_ar) {
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$cx = floor($width / 2 - $height * $t_ar / 2);
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$cw = ceil($height * $t_ar);
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} elseif ($s_ar < $t_ar) {
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$cy = floor($height / 2 - $width / $t_ar / 2);
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$ch = ceil($width / $t_ar);
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}
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} else {
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$rw = $maxW;
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$rh = ceil($height * $rw / $width);
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// Scaling caused too large height, decrease to max accepted value
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if ($rh > $maxH) {
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$rh = $maxH;
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$rw = ceil($width * $rh / $height);
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}
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}
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return array(intval($rw), intval($rh),
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intval($cx), intval($cy),
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is_null($cw) ? $width : intval($cw),
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is_null($ch) ? $height : intval($ch));
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}
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/**
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* Animated GIF test, courtesy of frank at huddler dot com et al:
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* http://php.net/manual/en/function.imagecreatefromgif.php#104473
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* Modified so avoid landing inside of a header (and thus not matching our regexp).
|
|
*/
|
|
protected function isAnimatedGif()
|
|
{
|
|
if (!($fh = @fopen($this->filepath, 'rb'))) {
|
|
return false;
|
|
}
|
|
|
|
$count = 0;
|
|
//an animated gif contains multiple "frames", with each frame having a
|
|
//header made up of:
|
|
// * a static 4-byte sequence (\x00\x21\xF9\x04)
|
|
// * 4 variable bytes
|
|
// * a static 2-byte sequence (\x00\x2C)
|
|
// In total the header is maximum 10 bytes.
|
|
|
|
// We read through the file til we reach the end of the file, or we've found
|
|
// at least 2 frame headers
|
|
while(!feof($fh) && $count < 2) {
|
|
$chunk = fread($fh, 1024 * 100); //read 100kb at a time
|
|
$count += preg_match_all('#\x00\x21\xF9\x04.{4}\x00\x2C#s', $chunk, $matches);
|
|
// rewind in case we ended up in the middle of the header, but avoid
|
|
// infinite loop (i.e. don't rewind if we're already in the end).
|
|
if (!feof($fh) && ftell($fh) >= 9) {
|
|
fseek($fh, -9, SEEK_CUR);
|
|
}
|
|
}
|
|
|
|
fclose($fh);
|
|
return $count >= 1; // number of animated frames apart from the original image
|
|
}
|
|
|
|
public function getFileThumbnail($width, $height, $crop, $upscale=false)
|
|
{
|
|
if (!$this->fileRecord instanceof File) {
|
|
throw new ServerException('No File object attached to this ImageFile object.');
|
|
}
|
|
|
|
if ($width === null) {
|
|
$width = common_config('thumbnail', 'width');
|
|
$height = common_config('thumbnail', 'height');
|
|
$crop = common_config('thumbnail', 'crop');
|
|
}
|
|
|
|
if (!$upscale) {
|
|
if ($width > $this->width) {
|
|
$width = $this->width;
|
|
}
|
|
if (!is_null($height) && $height > $this->height) {
|
|
$height = $this->height;
|
|
}
|
|
}
|
|
|
|
if ($height === null) {
|
|
$height = $width;
|
|
$crop = true;
|
|
}
|
|
|
|
// Get proper aspect ratio width and height before lookup
|
|
// We have to do it through an ImageFile object because of orientation etc.
|
|
// Only other solution would've been to rotate + rewrite uploaded files
|
|
// which we don't want to do because we like original, untouched data!
|
|
list($width, $height, $x, $y, $w, $h) = $this->scaleToFit($width, $height, $crop);
|
|
|
|
$thumb = File_thumbnail::pkeyGet(array(
|
|
'file_id'=> $this->fileRecord->getID(),
|
|
'width' => $width,
|
|
'height' => $height,
|
|
));
|
|
if ($thumb instanceof File_thumbnail) {
|
|
return $thumb;
|
|
}
|
|
|
|
$filename = $this->fileRecord->filehash ?: $this->filename; // Remote files don't have $this->filehash
|
|
$extension = File::guessMimeExtension($this->mimetype);
|
|
$outname = "thumb-{$this->fileRecord->getID()}-{$width}x{$height}-{$filename}." . $extension;
|
|
$outpath = File_thumbnail::path($outname);
|
|
|
|
// The boundary box for our resizing
|
|
$box = array('width'=>$width, 'height'=>$height,
|
|
'x'=>$x, 'y'=>$y,
|
|
'w'=>$w, 'h'=>$h);
|
|
|
|
// Doublecheck that parameters are sane and integers.
|
|
if ($box['width'] < 1 || $box['width'] > common_config('thumbnail', 'maxsize')
|
|
|| $box['height'] < 1 || $box['height'] > common_config('thumbnail', 'maxsize')
|
|
|| $box['w'] < 1 || $box['x'] >= $this->width
|
|
|| $box['h'] < 1 || $box['y'] >= $this->height) {
|
|
// Fail on bad width parameter. If this occurs, it's due to algorithm in ImageFile->scaleToFit
|
|
common_debug("Boundary box parameters for resize of {$this->filepath} : ".var_export($box,true));
|
|
throw new ServerException('Bad thumbnail size parameters.');
|
|
}
|
|
|
|
common_debug(sprintf('Generating a thumbnail of File id==%u of size %ux%u',
|
|
$this->fileRecord->getID(), $width, $height));
|
|
|
|
// Perform resize and store into file
|
|
$this->resizeTo($outpath, $box);
|
|
|
|
try {
|
|
// Avoid deleting the original
|
|
if (!in_array($this->getPath(), [File::path($this->filename), File_thumbnail::path($this->filename)])) {
|
|
$this->unlink();
|
|
}
|
|
} catch (FileNotFoundException $e) {
|
|
// $this->getPath() says the file doesn't exist anyway, so no point in trying to delete it!
|
|
}
|
|
|
|
return File_thumbnail::saveThumbnail($this->fileRecord->getID(),
|
|
// no url since we generated it ourselves and can dynamically
|
|
// generate the url
|
|
null,
|
|
$width, $height, $outname);
|
|
}
|
|
}
|