mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/PdfHandler
synced 2024-11-24 08:14:37 +00:00
441 lines
11 KiB
PHP
441 lines
11 KiB
PHP
<?php
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/**
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* Copyright © 2007 Martin Seidel (Xarax) <jodeldi@gmx.de>
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*
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* Inspired by djvuhandler from Tim Starling
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* Modified and written by Xarax
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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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class PdfHandler extends ImageHandler {
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public static $messages = [
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'main' => 'pdf-file-page-warning',
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'header' => 'pdf-file-page-warning-header',
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'info' => 'pdf-file-page-warning-info',
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'footer' => 'pdf-file-page-warning-footer',
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];
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/**
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* @return bool
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*/
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function isEnabled() {
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global $wgPdfProcessor, $wgPdfPostProcessor, $wgPdfInfo;
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if ( !isset( $wgPdfProcessor ) || !isset( $wgPdfPostProcessor ) || !isset( $wgPdfInfo ) ) {
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wfDebug( "PdfHandler is disabled, please set the following\n" );
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wfDebug( "variables in LocalSettings.php:\n" );
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wfDebug( "\$wgPdfProcessor, \$wgPdfPostProcessor, \$wgPdfInfo\n" );
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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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function mustRender( $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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function isMultiPage( $file ) {
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return true;
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}
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/**
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* @param string $name
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* @param string $value
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* @return bool
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*/
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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.pdf|thumb|Page 3 of the document shows foo]]
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return false;
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}
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if ( in_array( $name, [ 'width', 'height', 'page' ] ) ) {
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return ( $value > 0 );
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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 bool|string
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*/
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function makeParamString( $params ) {
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$page = isset( $params['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|bool
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*/
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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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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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* @return array
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*/
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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 int $width
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* @param int $height
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* @param string $msg
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* @return MediaTransformError
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*/
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protected function doThumbError( $width, $height, $msg ) {
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return new MediaTransformError( 'thumbnail_error',
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$width, $height, wfMessage( $msg )->inContentLanguage()->text() );
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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|MediaTransformOutput|ThumbnailImage|TransformParameterError
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*/
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function doTransform( $image, $dstPath, $dstUrl, $params, $flags = 0 ) {
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global $wgPdfProcessor, $wgPdfPostProcessor, $wgPdfHandlerDpi, $wgPdfHandlerJpegQuality;
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if ( !$this->normaliseParams( $image, $params ) ) {
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return new TransformParameterError( $params );
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}
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$width = (int)$params['width'];
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$height = (int)$params['height'];
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$page = (int)$params['page'];
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if ( $page > $this->pageCount( $image ) ) {
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return $this->doThumbError( $width, $height, 'pdf_page_error' );
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}
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if ( $flags & self::TRANSFORM_LATER ) {
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return new ThumbnailImage( $image, $dstUrl, $width, $height, false, $page );
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}
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if ( !wfMkdirParents( dirname( $dstPath ), null, __METHOD__ ) ) {
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return $this->doThumbError( $width, $height, 'thumbnail_dest_directory' );
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}
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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 ( $image->getSize() >= 1e7 ) { // 10MB
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$work = new PoolCounterWorkViaCallback( 'GetLocalFileCopy', sha1( $image->getName() ),
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[
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'doWork' => 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 ) { // could not download original
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return $this->doThumbError( $width, $height, 'filemissing' );
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}
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$cmd = '(' . wfEscapeShellArg(
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$wgPdfProcessor,
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"-sDEVICE=jpeg",
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"-sOutputFile=-",
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"-dFirstPage={$page}",
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"-dLastPage={$page}",
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"-dSAFER",
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"-r{$wgPdfHandlerDpi}",
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"-dBATCH",
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"-dNOPAUSE",
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"-q",
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$srcPath
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);
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$cmd .= " | " . wfEscapeShellArg(
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$wgPdfPostProcessor,
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"-depth",
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"8",
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"-quality",
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$wgPdfHandlerJpegQuality,
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"-resize",
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$width,
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"-",
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$dstPath
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);
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$cmd .= ")";
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wfDebug( __METHOD__ . ": $cmd\n" );
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$retval = '';
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$err = wfShellExecWithStderr( $cmd, $retval );
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$removed = $this->removeBadFile( $dstPath, $retval );
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if ( $retval != 0 || $removed ) {
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wfDebugLog( 'thumbnail',
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sprintf( 'thumbnail failed on %s: error %d "%s" from "%s"',
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wfHostname(), $retval, trim( $err ), $cmd ) );
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return new MediaTransformError( 'thumbnail_error', $width, $height, $err );
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} else {
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return new ThumbnailImage( $image, $dstUrl, $width, $height, $dstPath, $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 $path
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* @return PdfImage
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*/
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function getPdfImage( $image, $path ) {
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if ( !$image ) {
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$pdfimg = new PdfImage( $path );
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} elseif ( !isset( $image->pdfImage ) ) {
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$pdfimg = $image->pdfImage = new PdfImage( $path );
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} else {
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$pdfimg = $image->pdfImage;
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}
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return $pdfimg;
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}
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/**
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* @param File $image
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* @return bool
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*/
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function getMetaArray( $image ) {
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if ( isset( $image->pdfMetaArray ) ) {
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return $image->pdfMetaArray;
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}
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$metadata = $image->getMetadata();
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if ( !$this->isMetadataValid( $image, $metadata ) ) {
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wfDebug( "Pdf metadata is invalid or missing, should have been fixed in upgradeRow\n" );
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return false;
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}
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$work = new PoolCounterWorkViaCallback(
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'PdfHandler-unserialize-metadata',
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$image->getName(),
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[
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'doWork' => function () use ( $image, $metadata ) {
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wfSuppressWarnings();
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$image->pdfMetaArray = unserialize( $metadata );
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wfRestoreWarnings();
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},
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]
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);
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$work->execute();
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return $image->pdfMetaArray;
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}
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/**
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* @param File $image
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* @param string $path
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* @return array|bool
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*/
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function getImageSize( $image, $path ) {
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return $this->getPdfImage( $image, $path )->getImageSize();
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}
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/**
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* @param string $ext
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* @param string $mime
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* @param null $params
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* @return array
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*/
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function getThumbType( $ext, $mime, $params = null ) {
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global $wgPdfOutputExtension;
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static $mime;
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if ( !isset( $mime ) ) {
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$magic = MediaWiki\MediaWikiServices::getInstance()->getMimeAnalyzer();
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$mime = $magic->guessTypesForExtension( $wgPdfOutputExtension );
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}
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return [ $wgPdfOutputExtension, $mime ];
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}
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/**
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* @param File $image
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* @param string $path
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* @return string
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*/
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function getMetadata( $image, $path ) {
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return serialize( $this->getPdfImage( $image, $path )->retrieveMetaData() );
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}
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/**
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* @param File $image
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* @param string $metadata
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* @return bool
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*/
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function isMetadataValid( $image, $metadata ) {
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if ( !$metadata || $metadata === serialize( [] ) ) {
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return self::METADATA_BAD;
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} elseif ( strpos( $metadata, 'mergedMetadata' ) === false ) {
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return self::METADATA_COMPATIBLE;
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}
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return self::METADATA_GOOD;
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}
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/**
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* @param File $image
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* @param bool|IContextSource $context Context to use (optional)
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* @return bool|array
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*/
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function formatMetadata( $image, $context = false ) {
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$meta = $image->getMetadata();
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if ( !$meta ) {
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return false;
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}
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wfSuppressWarnings();
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$meta = unserialize( $meta );
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wfRestoreWarnings();
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if ( !isset( $meta['mergedMetadata'] )
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|| !is_array( $meta['mergedMetadata'] )
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|| count( $meta['mergedMetadata'] ) < 1
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) {
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return false;
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}
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// Inherited from MediaHandler.
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return $this->formatMetadataHelper( $meta['mergedMetadata'], $context );
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}
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/**
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* @param File $image
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* @return bool|int
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*/
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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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/**
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* @param File $image
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* @param int $page
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* @return array|bool
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*/
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function getPageDimensions( File $image, $page ) {
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$index = $page; // MW starts pages at 1, as they are stored here
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$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 = ObjectCache::getMainWANInstance();
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return $cache->getWithSetCallback(
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$cache->makeKey( 'file-pdf', 'dimensions', $file->getSha1() ),
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$cache::TTL_INDEFINITE,
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function () use ( $file ) {
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$data = $this->getMetaArray( $file );
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if ( !$data || !isset( $data['Pages'] ) ) {
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return false;
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}
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unset( $data['text'] ); // lower peak RAM
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$dimsByPage = [];
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$count = intval( $data['Pages'] );
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for ( $i = 1; $i <= $count; $i++ ) {
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$dimsByPage[$i] = PdfImage::getPageSize( $data, $i );
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}
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return [ 'pageCount' => $count, 'dimensionsByPage' => $dimsByPage ];
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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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* @param File $image
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* @param int $page
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* @return bool
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*/
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function getPageText( File $image, $page ) {
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$data = $this->getMetaArray( $image );
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if ( !$data || !isset( $data['text'] ) || !isset( $data['text'][$page - 1] ) ) {
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return false;
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}
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return $data['text'][$page - 1];
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}
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/**
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* Adds a warning about PDFs being potentially dangerous to the file
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* page. Multiple messages with this base will be used.
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* @param File $file
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* @return array
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*/
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function getWarningConfig( $file ) {
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return [
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'messages' => self::$messages,
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'link' => '//www.mediawiki.org/wiki/Special:MyLanguage/Help:Security/PDF_files',
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'module' => 'pdfhandler.messages',
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];
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}
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/**
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* Register a module with the warning messages in it.
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* @param ResourceLoader &$resourceLoader
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*/
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static function registerWarningModule( &$resourceLoader ) {
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$resourceLoader->register( 'pdfhandler.messages', [
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'messages' => array_values( self::$messages ),
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] );
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}
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}
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