mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/PdfHandler
synced 2024-11-24 00:07:10 +00:00
2328f802b1
These messages have not changed since they were originally defined
in f4f87ceb (2015). Instead of using a hook to register the module
at runtime, put it in extension.json with a note next to the warning
configuration to keep the messages in sync.
Change-Id: I135bf1a9f2cd59926a40cc565e5c8a2a6f2483c0
458 lines
11 KiB
PHP
458 lines
11 KiB
PHP
<?php
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namespace MediaWiki\Extension\PdfHandler;
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use File;
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use IContextSource;
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use ImageHandler;
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use MediaTransformError;
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use MediaTransformOutput;
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use MediaWiki\MediaWikiServices;
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use PoolCounterWorkViaCallback;
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use ThumbnailImage;
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use TransformParameterError;
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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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/**
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* Keep in sync with pdfhandler.messages in extension.json
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*
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* @see getWarningConfig
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*/
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private const 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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* 10MB is considered a large file
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*/
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private const LARGE_FILE = 1e7;
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/**
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* Key for getHandlerState for value of type PdfImage
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*/
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private const STATE_PDF_IMAGE = 'pdfImage';
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/**
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* Key for getHandlerState for dimension info
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*/
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private const STATE_DIMENSION_INFO = 'pdfDimensionInfo';
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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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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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public 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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public 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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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.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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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|bool
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*/
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public function parseParamString( $str ) {
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$m = [];
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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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public 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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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 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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public 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( $params );
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}
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// @phan-suppress-next-line PhanTypePossiblyInvalidDimOffset
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$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, false, [
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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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}
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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 ( $image->getSize() >= self::LARGE_FILE ) {
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$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 ) {
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// 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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$wgPdfProcessor,
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"-sDEVICE=jpeg",
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"-sOutputFile=-",
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"-sstdout=%stderr",
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"-dFirstPage={$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, $dstPath, [
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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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}
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}
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/**
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* @param \MediaHandlerState $state
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* @param string $path
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* @return PdfImage
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*/
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private function getPdfImage( $state, $path ) {
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$pdfimg = $state->getHandlerState( self::STATE_PDF_IMAGE );
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if ( !$pdfimg ) {
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$pdfimg = new PdfImage( $path );
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$state->setHandlerState( self::STATE_PDF_IMAGE, $pdfimg );
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}
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return $pdfimg;
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}
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/**
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* @param \MediaHandlerState $state
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* @param string $path
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* @return array|bool
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*/
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public function getSizeAndMetadata( $state, $path ) {
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$metadata = $this->getPdfImage( $state, $path )->retrieveMetaData();
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$sizes = PdfImage::getPageSize( $metadata, 1 );
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if ( $sizes ) {
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return $sizes + [ 'metadata' => $metadata ];
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} else {
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return [ 'metadata' => $metadata ];
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}
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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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public 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 = 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 $file
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* @return bool
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*/
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public function isFileMetadataValid( $file ) {
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$data = $file->getMetadataItems( [ 'mergedMetadata', 'pages' ] );
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if ( !isset( $data['pages'] ) ) {
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return self::METADATA_BAD;
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} elseif ( !isset( $data['mergedMetadata'] ) ) {
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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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public function formatMetadata( $image, $context = false ) {
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$mergedMetadata = $image->getMetadataItem( 'mergedMetadata' );
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if ( !is_array( $mergedMetadata ) || !count( $mergedMetadata ) ) {
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return false;
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}
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// Inherited from MediaHandler.
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return $this->formatMetadataHelper( $mergedMetadata, $context );
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}
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/** @inheritDoc */
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protected function formatTag( string $key, $vals, $context = false ) {
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switch ( $key ) {
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case 'pdf-Producer':
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case 'pdf-Version':
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return htmlspecialchars( $vals );
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case 'pdf-PageSize':
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foreach ( $vals as &$val ) {
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$val = htmlspecialchars( $val );
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}
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return $vals;
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case 'pdf-Encrypted':
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// @todo: The value isn't i18n-ised; should be done here.
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// For reference, if encrypted this field's value looks like:
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// "yes (print:yes copy:no change:no addNotes:no)"
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return htmlspecialchars( $vals );
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default:
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break;
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}
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// Use default formatting
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return false;
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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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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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/**
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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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public function getPageDimensions( File $image, $page ) {
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// MW starts pages at 1, as they are stored here
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$index = $page;
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$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 $file ) {
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$info = $file->getHandlerState( self::STATE_DIMENSION_INFO );
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if ( !$info ) {
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$cache = MediaWikiServices::getInstance()->getMainWANObjectCache();
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$info = $cache->getWithSetCallback(
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$cache->makeKey( 'file-pdf', 'dimensions', $file->getSha1() ),
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$cache::TTL_INDEFINITE,
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static function () use ( $file ) {
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$data = $file->getMetadataItems( PdfImage::ITEMS_FOR_PAGE_SIZE );
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if ( !$data || !isset( $data['Pages'] ) ) {
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return false;
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}
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$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' => $dimsByPage ];
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}
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);
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}
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$file->setHandlerState( self::STATE_DIMENSION_INFO, $info );
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return $info;
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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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public function getPageText( File $image, $page ) {
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$pageTexts = $image->getMetadataItem( 'text' );
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if ( !is_array( $pageTexts ) || !isset( $pageTexts[$page - 1] ) ) {
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return false;
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}
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return $pageTexts[$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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public 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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public function useSplitMetadata() {
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return true;
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}
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}
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