626 lines
23 KiB
PHP
626 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(
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'Exception %s caught when creating ImageFile for File id==%s ' .
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'and imgPath==%s: %s',
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get_class($e),
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_ve($file->id),
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_ve($imgPath),
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_ve($e->getMessage())
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));
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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 $outpath
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* @return ImageFile the image stored at target path
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* @throws ClientException
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* @throws NoResultException
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* @throws ServerException
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* @throws UnsupportedMediaException
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* @throws UseFileAsThumbnailException
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*/
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public function copyTo($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 $box width, height, boundary box (x,y,w,h) defaults to full image
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* @return string full local filesystem filename
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* @throws UnsupportedMediaException
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* @throws UseFileAsThumbnailException
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*/
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public function resizeTo($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(
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$image_dest,
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$transparent_color['red'],
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$transparent_color['green'],
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$transparent_color['blue']
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);
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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(
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$image_dest,
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$image_src,
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0,
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0,
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$box['x'],
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$box['y'],
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$box['width'],
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$box['height'],
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$box['w'],
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$box['h']
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);
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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, $crop=null)
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{
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return self::getScalingValues(
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$this->width,
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$this->height,
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$maxWidth,
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$maxHeight,
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$crop,
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$this->rotate
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);
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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 $rotate
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* @return array
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* @throws ServerException
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*/
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public static function getScalingValues(
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$width,
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$height,
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$maxW=null,
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$maxH=null,
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$crop=null,
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$rotate=0
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) {
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$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).
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*/
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protected function isAnimatedGif()
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{
|
|
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.');
|
|
}
|
|
|
|
// Throws FileNotFoundException or FileNotStoredLocallyException
|
|
$this->filepath = $this->fileRecord->getFileOrThumbnailPath();
|
|
|
|
if ($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;
|
|
}
|
|
|
|
$filename = basename($this->filepath);
|
|
$extension = File::guessMimeExtension($this->mimetype);
|
|
$outname = "thumb-{$this->fileRecord->getID()}-{$width}x{$height}-{$filename}";
|
|
$outpath = File_thumbnail::path($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
|
|
);
|
|
}
|
|
}
|