646 lines
19 KiB
PHP
646 lines
19 KiB
PHP
<?php
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/**
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* Handler for SVG images.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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* http://www.gnu.org/copyleft/gpl.html
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*
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* @file
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* @ingroup Media
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*/
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use MediaWiki\Context\IContextSource;
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use MediaWiki\Language\LanguageCode;
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use MediaWiki\MainConfigNames;
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use MediaWiki\MediaWikiServices;
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use MediaWiki\Shell\Shell;
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use Wikimedia\AtEase\AtEase;
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use Wikimedia\ScopedCallback;
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/**
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* Handler for SVG images.
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*
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* @ingroup Media
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*/
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class SvgHandler extends ImageHandler {
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public const SVG_METADATA_VERSION = 2;
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private const SVG_DEFAULT_RENDER_LANG = 'en';
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/** @var array A list of metadata tags that can be converted
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* to the commonly used exif tags. This allows messages
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* to be reused, and consistent tag names for {{#formatmetadata:..}}
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*/
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private static $metaConversion = [
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'originalwidth' => 'ImageWidth',
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'originalheight' => 'ImageLength',
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'description' => 'ImageDescription',
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'title' => 'ObjectName',
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];
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public function isEnabled() {
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$config = MediaWikiServices::getInstance()->getMainConfig();
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$svgConverters = $config->get( MainConfigNames::SVGConverters );
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$svgConverter = $config->get( MainConfigNames::SVGConverter );
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if ( $config->get( MainConfigNames::SVGNativeRendering ) === true ) {
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return true;
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}
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if ( !isset( $svgConverters[$svgConverter] ) ) {
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wfDebug( "\$wgSVGConverter is invalid, disabling SVG rendering." );
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return false;
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}
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return true;
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}
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public function allowRenderingByUserAgent( $file ) {
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$svgNativeRendering = MediaWikiServices::getInstance()
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->getMainConfig()->get( MainConfigNames::SVGNativeRendering );
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if ( $svgNativeRendering === true ) {
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// Don't do any transform for any SVG.
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return true;
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}
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if ( $svgNativeRendering !== 'partial' ) {
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// SVG images are always rasterized to PNG
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return false;
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}
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$maxSVGFilesize = MediaWikiServices::getInstance()
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->getMainConfig()->get( MainConfigNames::SVGNativeRenderingSizeLimit );
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// Browsers don't really support SVG translations, so always render them to PNG
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// Files bigger than the limit are also rendered as PNG, as big files might be a tax on the user agent
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return count( $this->getAvailableLanguages( $file ) ) <= 1
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&& $file->getSize() <= $maxSVGFilesize;
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}
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public function mustRender( $file ) {
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return !$this->allowRenderingByUserAgent( $file );
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}
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public function isVectorized( $file ) {
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return true;
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}
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/**
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* @param File $file
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* @return bool
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*/
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public function isAnimatedImage( $file ) {
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# @todo Detect animated SVGs
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$metadata = $this->validateMetadata( $file->getMetadataArray() );
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if ( isset( $metadata['animated'] ) ) {
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return $metadata['animated'];
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}
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return false;
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}
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/**
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* Which languages (systemLanguage attribute) is supported.
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*
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* @note This list is not guaranteed to be exhaustive.
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* To avoid OOM errors, we only look at first bit of a file.
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* Thus all languages on this list are present in the file,
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* but its possible for the file to have a language not on
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* this list.
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*
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* @param File $file
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* @return string[] Array of language codes, or empty if no language switching supported.
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*/
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public function getAvailableLanguages( File $file ) {
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$langList = [];
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$metadata = $this->validateMetadata( $file->getMetadataArray() );
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if ( isset( $metadata['translations'] ) ) {
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foreach ( $metadata['translations'] as $lang => $langType ) {
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if ( $langType === SVGReader::LANG_FULL_MATCH ) {
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$langList[] = strtolower( $lang );
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}
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}
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}
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return array_unique( $langList );
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}
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/**
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* SVG's systemLanguage matching rules state:
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* 'The `systemLanguage` attribute ... [e]valuates to "true" if one of the languages indicated
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* by user preferences exactly equals one of the languages given in the value of this parameter,
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* or if one of the languages indicated by user preferences exactly equals a prefix of one of
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* the languages given in the value of this parameter such that the first tag character
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* following the prefix is "-".'
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*
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* Return the first element of $svgLanguages that matches $userPreferredLanguage
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*
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* @see https://www.w3.org/TR/SVG/struct.html#SystemLanguageAttribute
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* @param string $userPreferredLanguage
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* @param string[] $svgLanguages
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* @return string|null
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*/
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public function getMatchedLanguage( $userPreferredLanguage, array $svgLanguages ) {
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// Explicitly requested undetermined language (text without svg systemLanguage attribute)
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if ( $userPreferredLanguage === 'und' ) {
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return 'und';
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}
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foreach ( $svgLanguages as $svgLang ) {
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if ( strcasecmp( $svgLang, $userPreferredLanguage ) === 0 ) {
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return $svgLang;
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}
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$trimmedSvgLang = $svgLang;
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while ( strpos( $trimmedSvgLang, '-' ) !== false ) {
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$trimmedSvgLang = substr( $trimmedSvgLang, 0, strrpos( $trimmedSvgLang, '-' ) );
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if ( strcasecmp( $trimmedSvgLang, $userPreferredLanguage ) === 0 ) {
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return $svgLang;
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}
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}
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}
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return null;
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}
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/**
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* Determines render language from image parameters
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* This is a lowercase IETF language
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*
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* @param array $params
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* @return string
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*/
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protected function getLanguageFromParams( array $params ) {
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return $params['lang'] ?? $params['targetlang'] ?? self::SVG_DEFAULT_RENDER_LANG;
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}
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/**
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* What language to render file in if none selected
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*
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* @param File $file Language code
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* @return string
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*/
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public function getDefaultRenderLanguage( File $file ) {
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return self::SVG_DEFAULT_RENDER_LANG;
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}
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/**
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* We do not support making animated svg thumbnails
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* @param File $file
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* @return bool
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*/
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public function canAnimateThumbnail( $file ) {
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return $this->allowRenderingByUserAgent( $file );
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}
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/**
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* @param File $image
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* @param array &$params
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* @return bool
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*/
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public function normaliseParams( $image, &$params ) {
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if ( parent::normaliseParams( $image, $params ) ) {
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$params = $this->normaliseParamsInternal( $image, $params );
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return true;
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}
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return false;
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}
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/**
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* Code taken out of normaliseParams() for testability
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*
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* @since 1.33
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*
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* @param File $image
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* @param array $params
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* @return array Modified $params
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*/
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protected function normaliseParamsInternal( $image, $params ) {
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$svgMaxSize = MediaWikiServices::getInstance()->getMainConfig()->get( MainConfigNames::SVGMaxSize );
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# Don't make an image bigger than wgMaxSVGSize on the smaller side
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if ( $params['physicalWidth'] <= $params['physicalHeight'] ) {
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if ( $params['physicalWidth'] > $svgMaxSize ) {
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$srcWidth = $image->getWidth( $params['page'] );
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$srcHeight = $image->getHeight( $params['page'] );
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$params['physicalWidth'] = $svgMaxSize;
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$params['physicalHeight'] = File::scaleHeight( $srcWidth, $srcHeight, $svgMaxSize );
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}
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} elseif ( $params['physicalHeight'] > $svgMaxSize ) {
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$srcWidth = $image->getWidth( $params['page'] );
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$srcHeight = $image->getHeight( $params['page'] );
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$params['physicalWidth'] = File::scaleHeight( $srcHeight, $srcWidth, $svgMaxSize );
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$params['physicalHeight'] = $svgMaxSize;
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}
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// To prevent the proliferation of thumbnails in languages not present in SVGs, unless
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// explicitly forced by user.
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if ( isset( $params['targetlang'] ) && !$image->getMatchedLanguage( $params['targetlang'] ) ) {
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unset( $params['targetlang'] );
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}
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return $params;
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}
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/**
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* @param File $image
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* @param string $dstPath
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* @param string $dstUrl
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* @param array $params
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* @param int $flags
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* @return MediaTransformError|ThumbnailImage|TransformParameterError|false
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*/
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public function doTransform( $image, $dstPath, $dstUrl, $params, $flags = 0 ) {
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if ( !$this->normaliseParams( $image, $params ) ) {
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return new TransformParameterError( $params );
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}
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$clientWidth = $params['width'];
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$clientHeight = $params['height'];
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$physicalWidth = $params['physicalWidth'];
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$physicalHeight = $params['physicalHeight'];
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$lang = $this->getLanguageFromParams( $params );
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if ( $this->allowRenderingByUserAgent( $image ) ) {
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// No transformation required for native rendering
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return new ThumbnailImage( $image, $image->getURL(), false, $params );
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}
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if ( $flags & self::TRANSFORM_LATER ) {
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return new ThumbnailImage( $image, $dstUrl, $dstPath, $params );
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}
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$metadata = $this->validateMetadata( $image->getMetadataArray() );
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if ( isset( $metadata['error'] ) ) {
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$err = wfMessage( 'svg-long-error', $metadata['error']['message'] );
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return new MediaTransformError( 'thumbnail_error', $clientWidth, $clientHeight, $err );
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}
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if ( !wfMkdirParents( dirname( $dstPath ), null, __METHOD__ ) ) {
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return new MediaTransformError( 'thumbnail_error', $clientWidth, $clientHeight,
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wfMessage( 'thumbnail_dest_directory' ) );
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}
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$srcPath = $image->getLocalRefPath();
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if ( $srcPath === false ) { // Failed to get local copy
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wfDebugLog( 'thumbnail',
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sprintf( 'Thumbnail failed on %s: could not get local copy of "%s"',
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wfHostname(), $image->getName() ) );
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return new MediaTransformError( 'thumbnail_error',
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$params['width'], $params['height'],
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wfMessage( 'filemissing' )
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);
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}
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// Make a temp dir with a symlink to the local copy in it.
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// This plays well with rsvg-convert policy for external entities.
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// https://git.gnome.org/browse/librsvg/commit/?id=f01aded72c38f0e18bc7ff67dee800e380251c8e
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$tmpDir = wfTempDir() . '/svg_' . wfRandomString( 24 );
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$lnPath = "$tmpDir/" . basename( $srcPath );
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$ok = mkdir( $tmpDir, 0771 );
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if ( !$ok ) {
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wfDebugLog( 'thumbnail',
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sprintf( 'Thumbnail failed on %s: could not create temporary directory %s',
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wfHostname(), $tmpDir ) );
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return new MediaTransformError( 'thumbnail_error',
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$params['width'], $params['height'],
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wfMessage( 'thumbnail-temp-create' )->text()
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);
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}
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// phpcs:ignore Generic.PHP.NoSilencedErrors.Discouraged
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$ok = @symlink( $srcPath, $lnPath );
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/** @noinspection PhpUnusedLocalVariableInspection */
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$cleaner = new ScopedCallback( static function () use ( $tmpDir, $lnPath ) {
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AtEase::suppressWarnings();
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unlink( $lnPath );
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rmdir( $tmpDir );
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AtEase::restoreWarnings();
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} );
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if ( !$ok ) {
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// Fallback because symlink often fails on Windows
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$ok = copy( $srcPath, $lnPath );
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}
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if ( !$ok ) {
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wfDebugLog( 'thumbnail',
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sprintf( 'Thumbnail failed on %s: could not link %s to %s',
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wfHostname(), $lnPath, $srcPath ) );
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return new MediaTransformError( 'thumbnail_error',
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$params['width'], $params['height'],
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wfMessage( 'thumbnail-temp-create' )
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);
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}
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$status = $this->rasterize( $lnPath, $dstPath, $physicalWidth, $physicalHeight, $lang );
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if ( $status === true ) {
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return new ThumbnailImage( $image, $dstUrl, $dstPath, $params );
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}
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return $status; // MediaTransformError
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}
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/**
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* Transform an SVG file to PNG
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* This function can be called outside of thumbnail contexts
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* @param string $srcPath
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* @param string $dstPath
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* @param int $width
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* @param int $height
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* @param string|false $lang Language code of the language to render the SVG in
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* @return bool|MediaTransformError
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*/
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public function rasterize( $srcPath, $dstPath, $width, $height, $lang = false ) {
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$mainConfig = MediaWikiServices::getInstance()->getMainConfig();
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$svgConverters = $mainConfig->get( MainConfigNames::SVGConverters );
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$svgConverter = $mainConfig->get( MainConfigNames::SVGConverter );
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$svgConverterPath = $mainConfig->get( MainConfigNames::SVGConverterPath );
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$err = false;
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$retval = '';
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if ( isset( $svgConverters[$svgConverter] ) ) {
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if ( is_array( $svgConverters[$svgConverter] ) ) {
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// This is a PHP callable
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$func = $svgConverters[$svgConverter][0];
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if ( !is_callable( $func ) ) {
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throw new UnexpectedValueException( "$func is not callable" );
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}
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$err = $func( $srcPath,
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$dstPath,
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$width,
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$height,
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$lang,
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...array_slice( $svgConverters[$svgConverter], 1 )
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);
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$retval = (bool)$err;
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} else {
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// External command
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$cmd = strtr( $svgConverters[$svgConverter], [
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'$path/' => $svgConverterPath ? Shell::escape( "$svgConverterPath/" ) : '',
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'$width' => (int)$width,
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'$height' => (int)$height,
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'$input' => Shell::escape( $srcPath ),
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'$output' => Shell::escape( $dstPath ),
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] );
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$env = [];
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if ( $lang !== false ) {
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$env['LANG'] = $lang;
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}
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wfDebug( __METHOD__ . ": $cmd" );
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$err = wfShellExecWithStderr( $cmd, $retval, $env );
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}
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}
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$removed = $this->removeBadFile( $dstPath, $retval );
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if ( $retval != 0 || $removed ) {
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// @phan-suppress-next-next-line PhanPossiblyUndeclaredVariable cmd is set when used
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// @phan-suppress-next-line PhanTypeMismatchArgumentNullable cmd is set when used
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$this->logErrorForExternalProcess( $retval, $err, $cmd );
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return new MediaTransformError( 'thumbnail_error', $width, $height, $err );
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}
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return true;
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}
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public static function rasterizeImagickExt( $srcPath, $dstPath, $width, $height ) {
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$im = new Imagick( $srcPath );
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$im->setBackgroundColor( 'transparent' );
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$im->readImage( $srcPath );
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$im->setImageFormat( 'png' );
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$im->setImageDepth( 8 );
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if ( !$im->thumbnailImage( (int)$width, (int)$height, /* fit */ false ) ) {
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return 'Could not resize image';
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}
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if ( !$im->writeImage( $dstPath ) ) {
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return "Could not write to $dstPath";
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}
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}
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public function getThumbType( $ext, $mime, $params = null ) {
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return [ 'png', 'image/png' ];
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}
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/**
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* Subtitle for the image. Different from the base
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* class so it can be denoted that SVG's have
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* a "nominal" resolution, and not a fixed one,
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* as well as so animation can be denoted.
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*
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* @param File $file
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* @return string
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*/
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public function getLongDesc( $file ) {
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$metadata = $this->validateMetadata( $file->getMetadataArray() );
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if ( isset( $metadata['error'] ) ) {
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return wfMessage( 'svg-long-error', $metadata['error']['message'] )->text();
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}
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if ( $this->isAnimatedImage( $file ) ) {
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$msg = wfMessage( 'svg-long-desc-animated' );
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} else {
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$msg = wfMessage( 'svg-long-desc' );
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}
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return $msg->numParams( $file->getWidth(), $file->getHeight() )->sizeParams( $file->getSize() )->parse();
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}
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/**
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* @param MediaHandlerState $state
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* @param string $filename
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* @return array
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*/
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public function getSizeAndMetadata( $state, $filename ) {
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$metadata = [ 'version' => self::SVG_METADATA_VERSION ];
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try {
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$svgReader = new SVGReader( $filename );
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$metadata += $svgReader->getMetadata();
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} catch ( InvalidSVGException $e ) {
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// File not found, broken, etc.
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$metadata['error'] = [
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'message' => $e->getMessage(),
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'code' => $e->getCode()
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];
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wfDebug( __METHOD__ . ': ' . $e->getMessage() );
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}
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return [
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'width' => $metadata['width'] ?? 0,
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'height' => $metadata['height'] ?? 0,
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'metadata' => $metadata
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];
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}
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protected function validateMetadata( $unser ) {
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if ( isset( $unser['version'] ) && $unser['version'] === self::SVG_METADATA_VERSION ) {
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return $unser;
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}
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return null;
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}
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public function getMetadataType( $image ) {
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return 'parsed-svg';
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}
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public function isFileMetadataValid( $image ) {
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$meta = $this->validateMetadata( $image->getMetadataArray() );
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if ( !$meta ) {
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return self::METADATA_BAD;
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}
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if ( !isset( $meta['originalWidth'] ) ) {
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// Old but compatible
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return self::METADATA_COMPATIBLE;
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}
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return self::METADATA_GOOD;
|
|
}
|
|
|
|
protected function visibleMetadataFields() {
|
|
return [ 'objectname', 'imagedescription' ];
|
|
}
|
|
|
|
/**
|
|
* @param File $file
|
|
* @param IContextSource|false $context
|
|
* @return array[]|false
|
|
*/
|
|
public function formatMetadata( $file, $context = false ) {
|
|
$result = [
|
|
'visible' => [],
|
|
'collapsed' => []
|
|
];
|
|
$metadata = $this->validateMetadata( $file->getMetadataArray() );
|
|
if ( !$metadata || isset( $metadata['error'] ) ) {
|
|
return false;
|
|
}
|
|
|
|
/* @todo Add a formatter
|
|
$format = new FormatSVG( $metadata );
|
|
$formatted = $format->getFormattedData();
|
|
*/
|
|
|
|
// Sort fields into visible and collapsed
|
|
$visibleFields = $this->visibleMetadataFields();
|
|
|
|
$showMeta = false;
|
|
foreach ( $metadata as $name => $value ) {
|
|
$tag = strtolower( $name );
|
|
if ( isset( self::$metaConversion[$tag] ) ) {
|
|
$tag = strtolower( self::$metaConversion[$tag] );
|
|
} else {
|
|
// Do not output other metadata not in list
|
|
continue;
|
|
}
|
|
$showMeta = true;
|
|
self::addMeta( $result,
|
|
in_array( $tag, $visibleFields ) ? 'visible' : 'collapsed',
|
|
'exif',
|
|
$tag,
|
|
$value
|
|
);
|
|
}
|
|
|
|
return $showMeta ? $result : false;
|
|
}
|
|
|
|
/**
|
|
* @param string $name Parameter name
|
|
* @param mixed $value Parameter value
|
|
* @return bool Validity
|
|
*/
|
|
public function validateParam( $name, $value ) {
|
|
if ( in_array( $name, [ 'width', 'height' ] ) ) {
|
|
// Reject negative heights, widths
|
|
return ( $value > 0 );
|
|
}
|
|
if ( $name === 'lang' ) {
|
|
// Validate $code
|
|
if ( $value === ''
|
|
|| !LanguageCode::isWellFormedLanguageTag( $value )
|
|
) {
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
// Only lang, width and height are acceptable keys
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* @param array $params Name=>value pairs of parameters
|
|
* @return string|false Filename to use
|
|
*/
|
|
public function makeParamString( $params ) {
|
|
$lang = '';
|
|
$code = $this->getLanguageFromParams( $params );
|
|
if ( $code !== self::SVG_DEFAULT_RENDER_LANG ) {
|
|
$lang = 'lang' . strtolower( $code ) . '-';
|
|
}
|
|
if ( !isset( $params['width'] ) ) {
|
|
return false;
|
|
}
|
|
|
|
return "$lang{$params['width']}px";
|
|
}
|
|
|
|
public function parseParamString( $str ) {
|
|
$m = false;
|
|
// Language codes are supposed to be lowercase
|
|
if ( preg_match( '/^lang([a-z]+(?:-[a-z]+)*)-(\d+)px$/', $str, $m ) ) {
|
|
if ( LanguageCode::isWellFormedLanguageTag( $m[1] ) ) {
|
|
return [ 'width' => array_pop( $m ), 'lang' => $m[1] ];
|
|
}
|
|
return [ 'width' => array_pop( $m ), 'lang' => self::SVG_DEFAULT_RENDER_LANG ];
|
|
}
|
|
if ( preg_match( '/^(\d+)px$/', $str, $m ) ) {
|
|
return [ 'width' => $m[1], 'lang' => self::SVG_DEFAULT_RENDER_LANG ];
|
|
}
|
|
return false;
|
|
}
|
|
|
|
public function getParamMap() {
|
|
return [ 'img_lang' => 'lang', 'img_width' => 'width' ];
|
|
}
|
|
|
|
/**
|
|
* @param array $params
|
|
* @return array
|
|
*/
|
|
protected function getScriptParams( $params ) {
|
|
$scriptParams = [ 'width' => $params['width'] ];
|
|
if ( isset( $params['lang'] ) ) {
|
|
$scriptParams['lang'] = $params['lang'];
|
|
}
|
|
|
|
return $scriptParams;
|
|
}
|
|
|
|
public function getCommonMetaArray( File $file ) {
|
|
$metadata = $this->validateMetadata( $file->getMetadataArray() );
|
|
if ( !$metadata || isset( $metadata['error'] ) ) {
|
|
return [];
|
|
}
|
|
$stdMetadata = [];
|
|
foreach ( $metadata as $name => $value ) {
|
|
$tag = strtolower( $name );
|
|
if ( $tag === 'originalwidth' || $tag === 'originalheight' ) {
|
|
// Skip these. In the exif metadata stuff, it is assumed these
|
|
// are measured in px, which is not the case here.
|
|
continue;
|
|
}
|
|
if ( isset( self::$metaConversion[$tag] ) ) {
|
|
$tag = self::$metaConversion[$tag];
|
|
$stdMetadata[$tag] = $value;
|
|
}
|
|
}
|
|
|
|
return $stdMetadata;
|
|
}
|
|
}
|