b7c5d05813
Two of the classes in this directory have already namespaced to MediaWiki\PoolCounter. Bug: T353458 Change-Id: Ie41f8d935f7623bb40040a5eb78f99c6d7b7b75e
414 lines
11 KiB
PHP
414 lines
11 KiB
PHP
<?php
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/**
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* Handler for DjVu 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\MainConfigNames;
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use MediaWiki\MediaWikiServices;
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use MediaWiki\PoolCounter\PoolCounterWorkViaCallback;
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use MediaWiki\Shell\Shell;
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/**
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* Handler for DjVu images
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*
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* @ingroup Media
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*/
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class DjVuHandler extends ImageHandler {
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private const EXPENSIVE_SIZE_LIMIT = 10_485_760; // 10MiB
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// Constants for getHandlerState
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private const STATE_DJVU_IMAGE = 'djvuImage';
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private const STATE_TEXT_TREE = 'djvuTextTree';
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private const STATE_META_TREE = 'djvuMetaTree';
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private const CACHE_VERSION = 'v2';
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/**
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* @return bool
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*/
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public function isEnabled() {
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$djvuRenderer = MediaWikiServices::getInstance()->getMainConfig()->get( MainConfigNames::DjvuRenderer );
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$djvuDump = MediaWikiServices::getInstance()->getMainConfig()->get( MainConfigNames::DjvuDump );
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if ( !$djvuRenderer || !$djvuDump ) {
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wfDebug( "DjVu is disabled, please set \$wgDjvuRenderer and \$wgDjvuDump" );
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return false;
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}
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return true;
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}
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/**
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* @param File $file
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* @return bool
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*/
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public function mustRender( $file ) {
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return true;
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}
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/**
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* True if creating thumbnails from the file is large or otherwise resource-intensive.
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* @param File $file
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* @return bool
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*/
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public function isExpensiveToThumbnail( $file ) {
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return $file->getSize() > static::EXPENSIVE_SIZE_LIMIT;
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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 isMultiPage( $file ) {
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return true;
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}
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/**
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* @return array
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*/
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public function getParamMap() {
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return [
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'img_width' => 'width',
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'img_page' => 'page',
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];
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}
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/**
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* @param string $name
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* @param mixed $value
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* @return bool
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*/
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public function validateParam( $name, $value ) {
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if ( $name === 'page' && trim( $value ) !== (string)intval( $value ) ) {
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// Extra junk on the end of page, probably actually a caption
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// e.g. [[File:Foo.djvu|thumb|Page 3 of the document shows foo]]
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return false;
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}
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return in_array( $name, [ 'width', 'height', 'page' ] ) && $value > 0;
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}
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/**
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* @param array $params
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* @return string|false
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*/
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public function makeParamString( $params ) {
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$page = $params['page'] ?? 1;
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if ( !isset( $params['width'] ) ) {
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return false;
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}
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return "page{$page}-{$params['width']}px";
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}
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/**
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* @param string $str
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* @return array|false
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*/
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public function parseParamString( $str ) {
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$m = false;
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if ( preg_match( '/^page(\d+)-(\d+)px$/', $str, $m ) ) {
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return [ 'width' => $m[2], 'page' => $m[1] ];
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}
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return false;
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}
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/**
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* @param array $params
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* @return array
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*/
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protected function getScriptParams( $params ) {
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return [
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'width' => $params['width'],
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'page' => $params['page'],
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];
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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
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*/
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public function doTransform( $image, $dstPath, $dstUrl, $params, $flags = 0 ) {
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$djvuRenderer = MediaWikiServices::getInstance()->getMainConfig()->get( MainConfigNames::DjvuRenderer );
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$djvuPostProcessor = MediaWikiServices::getInstance()->getMainConfig()
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->get( MainConfigNames::DjvuPostProcessor );
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if ( !$this->normaliseParams( $image, $params ) ) {
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return new TransformParameterError( $params );
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}
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$width = $params['width'];
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$height = $params['height'];
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$page = $params['page'];
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if ( $flags & self::TRANSFORM_LATER ) {
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$params = [
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'width' => $width,
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'height' => $height,
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'page' => $page
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];
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return new ThumbnailImage( $image, $dstUrl, $dstPath, $params );
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}
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if ( !wfMkdirParents( dirname( $dstPath ), null, __METHOD__ ) ) {
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return new MediaTransformError(
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'thumbnail_error',
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$width,
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$height,
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wfMessage( 'thumbnail_dest_directory' )
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);
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}
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// Get local copy source for shell scripts
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// Thumbnail extraction is very inefficient for large files.
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// Provide a way to pool count limit the number of downloaders.
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if ( $image->getSize() >= 1e7 ) { // 10 MB
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$work = new PoolCounterWorkViaCallback( 'GetLocalFileCopy', sha1( $image->getName() ),
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[
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'doWork' => static function () use ( $image ) {
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return $image->getLocalRefPath();
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}
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]
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);
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$srcPath = $work->execute();
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} else {
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$srcPath = $image->getLocalRefPath();
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}
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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'], $params['height'],
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wfMessage( 'filemissing' )
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);
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}
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# Use a subshell (brackets) to aggregate stderr from both pipeline commands
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# before redirecting it to the overall stdout. This works in both Linux and Windows XP.
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$cmd = '(' . Shell::escape(
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$djvuRenderer,
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"-format=ppm",
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"-page={$page}",
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"-size={$params['physicalWidth']}x{$params['physicalHeight']}",
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$srcPath );
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if ( $djvuPostProcessor ) {
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$cmd .= " | {$djvuPostProcessor}";
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}
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$cmd .= ' > ' . Shell::escape( $dstPath ) . ') 2>&1';
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wfDebug( __METHOD__ . ": $cmd" );
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$retval = 0;
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$err = wfShellExec( $cmd, $retval );
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$removed = $this->removeBadFile( $dstPath, $retval );
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if ( $retval !== 0 || $removed ) {
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$this->logErrorForExternalProcess( $retval, $err, $cmd );
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return new MediaTransformError( 'thumbnail_error', $width, $height, $err );
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}
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$params = [
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'width' => $width,
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'height' => $height,
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'page' => $page
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];
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return new ThumbnailImage( $image, $dstUrl, $dstPath, $params );
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}
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/**
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* Cache an instance of DjVuImage in a MediaHandlerState object, return
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* that instance
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*
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* @param MediaHandlerState $state
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* @param string $path
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* @return DjVuImage
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*/
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private function getDjVuImage( $state, $path ) {
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$deja = $state->getHandlerState( self::STATE_DJVU_IMAGE );
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if ( !$deja ) {
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$deja = new DjVuImage( $path );
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$state->setHandlerState( self::STATE_DJVU_IMAGE, $deja );
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}
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return $deja;
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}
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/**
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* Get metadata, unserializing it if necessary.
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*
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* @param File $file The DjVu file in question
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* @param bool $gettext
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* @return string|false|array metadata
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*/
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private function getMetadataInternal( File $file, $gettext ) {
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$itemNames = [ 'error', '_error', 'data' ];
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if ( $gettext ) {
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$itemNames[] = 'text';
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}
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$unser = $file->getMetadataItems( $itemNames );
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if ( isset( $unser['error'] ) ) {
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return false;
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}
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if ( isset( $unser['_error'] ) ) {
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return false;
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}
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return $unser;
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}
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/**
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* Cache a document tree for the DjVu metadata
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* @param File $image
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* @param bool $gettext DOCUMENT (Default: false)
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* @return false|array
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*/
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public function getMetaTree( $image, $gettext = false ) {
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if ( $gettext && $image->getHandlerState( self::STATE_TEXT_TREE ) ) {
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return $image->getHandlerState( self::STATE_TEXT_TREE );
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}
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if ( !$gettext && $image->getHandlerState( self::STATE_META_TREE ) ) {
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return $image->getHandlerState( self::STATE_META_TREE );
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}
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$metadata = $this->getMetadataInternal( $image, $gettext );
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if ( !$metadata ) {
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return false;
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}
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if ( !$gettext ) {
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unset( $metadata['text'] );
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}
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return $metadata;
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}
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public function getThumbType( $ext, $mime, $params = null ) {
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$djvuOutputExtension = MediaWikiServices::getInstance()->getMainConfig()
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->get( MainConfigNames::DjvuOutputExtension );
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static $mime;
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if ( !isset( $mime ) ) {
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$magic = MediaWikiServices::getInstance()->getMimeAnalyzer();
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$mime = $magic->getMimeTypeFromExtensionOrNull( $djvuOutputExtension );
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}
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return [ $djvuOutputExtension, $mime ];
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}
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public function getSizeAndMetadata( $state, $path ) {
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wfDebug( "Getting DjVu metadata for $path" );
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$djvuImage = $this->getDjVuImage( $state, $path );
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$metadata = $djvuImage->retrieveMetaData();
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if ( $metadata === false ) {
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// Special value so that we don't repetitively try and decode a broken file.
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$metadata = [ 'error' => 'Error extracting metadata' ];
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}
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return [ 'metadata' => $metadata ] + $djvuImage->getImageSize();
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}
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public function getMetadataType( $image ) {
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// historical reasons
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return 'djvuxml';
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}
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public function isFileMetadataValid( $image ) {
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return $image->getMetadataArray() ? self::METADATA_GOOD : self::METADATA_BAD;
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}
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public function pageCount( File $image ) {
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$info = $this->getDimensionInfo( $image );
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return $info ? $info['pageCount'] : false;
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}
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public function getPageDimensions( File $image, $page ) {
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$index = $page - 1; // MW starts pages at 1
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$info = $this->getDimensionInfo( $image );
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if ( $info && isset( $info['dimensionsByPage'][$index] ) ) {
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return $info['dimensionsByPage'][$index];
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}
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return false;
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}
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protected function getDimensionInfo( File $file ) {
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$cache = MediaWikiServices::getInstance()->getMainWANObjectCache();
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return $cache->getWithSetCallback(
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$cache->makeKey( 'file-djvu', 'dimensions', self::CACHE_VERSION, $file->getSha1() ),
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$cache::TTL_INDEFINITE,
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function () use ( $file ) {
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$tree = $this->getMetaTree( $file );
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return $this->getDimensionInfoFromMetaTree( $tree );
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},
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[ 'pcTTL' => $cache::TTL_INDEFINITE ]
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);
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}
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/**
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* Given the metadata, returns dimension information about the document
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* @param false|array $metatree The file's metadata tree
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* @return array|false
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*/
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protected function getDimensionInfoFromMetaTree( $metatree ) {
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if ( !$metatree ) {
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return false;
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}
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$dimsByPage = [];
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if ( !isset( $metatree['data'] ) || !$metatree['data'] ) {
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return false;
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}
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foreach ( $metatree['data']['pages'] as $page ) {
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if ( !$page ) {
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$dimsByPage[] = false;
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} else {
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$dimsByPage[] = [
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'width' => (int)$page['width'],
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'height' => (int)$page['height'],
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];
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}
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}
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return [
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'pageCount' => count( $metatree['data']['pages'] ),
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'dimensionsByPage' => $dimsByPage
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];
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}
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/**
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* @param File $image
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* @param int $page Page number to get information for
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* @return string|false Page text or false when no text found.
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*/
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public function getPageText( File $image, $page ) {
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$tree = $this->getMetaTree( $image, true );
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if ( !$tree ) {
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return false;
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}
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if ( isset( $tree['text'] ) && isset( $tree['text'][$page - 1] ) ) {
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return $tree['text'][$page - 1];
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}
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return false;
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}
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public function useSplitMetadata() {
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return true;
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}
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}
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