mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/PdfHandler
synced 2024-12-18 02:51:00 +00:00
1e1e7ef135
Use $wgShellboxShell, introduced for this purpose in If41a2baada2e4e2462518c1f437af458feb29632. Change-Id: Ic35598f26a868624a8b2e37ab064a6c0c27e392f
323 lines
9 KiB
PHP
323 lines
9 KiB
PHP
<?php
|
|
/**
|
|
*
|
|
* Copyright © 2007 Xarax <jodeldi@gmx.de>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along
|
|
* with this program; if not, write to the Free Software Foundation, Inc.,
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
|
|
* http://www.gnu.org/copyleft/gpl.html
|
|
*/
|
|
|
|
namespace MediaWiki\Extension\PdfHandler;
|
|
|
|
use BitmapMetadataHandler;
|
|
use MediaWiki\Logger\LoggerFactory;
|
|
use MediaWiki\MediaWikiServices;
|
|
use UtfNormal\Validator;
|
|
use Wikimedia\XMPReader\Reader as XMPReader;
|
|
|
|
/**
|
|
* inspired by djvuimage from Brion Vibber
|
|
* modified and written by xarax
|
|
*/
|
|
|
|
class PdfImage {
|
|
|
|
/**
|
|
* @var string
|
|
*/
|
|
private $mFilename;
|
|
|
|
public const ITEMS_FOR_PAGE_SIZE = [ 'Pages', 'pages', 'Page size', 'Page rot' ];
|
|
|
|
/**
|
|
* @param string $filename
|
|
*/
|
|
public function __construct( $filename ) {
|
|
$this->mFilename = $filename;
|
|
}
|
|
|
|
/**
|
|
* @return bool
|
|
*/
|
|
public function isValid() {
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* @param array $data
|
|
* @param int $page
|
|
* @return array|bool
|
|
*/
|
|
public static function getPageSize( $data, $page ) {
|
|
global $wgPdfHandlerDpi;
|
|
|
|
if ( isset( $data['pages'][$page]['Page size'] ) ) {
|
|
$pageSize = $data['pages'][$page]['Page size'];
|
|
} elseif ( isset( $data['Page size'] ) ) {
|
|
$pageSize = $data['Page size'];
|
|
} else {
|
|
$pageSize = false;
|
|
}
|
|
|
|
if ( $pageSize ) {
|
|
if ( isset( $data['pages'][$page]['Page rot'] ) ) {
|
|
$pageRotation = $data['pages'][$page]['Page rot'];
|
|
} elseif ( isset( $data['Page rot'] ) ) {
|
|
$pageRotation = $data['Page rot'];
|
|
} else {
|
|
$pageRotation = 0;
|
|
}
|
|
$size = explode( 'x', $pageSize, 2 );
|
|
|
|
$width = intval( (int)trim( $size[0] ) / 72 * $wgPdfHandlerDpi );
|
|
$height = explode( ' ', trim( $size[1] ), 2 );
|
|
$height = intval( (int)trim( $height[0] ) / 72 * $wgPdfHandlerDpi );
|
|
if ( ( $pageRotation / 90 ) & 1 ) {
|
|
// Swap width and height for landscape pages
|
|
$temp = $width;
|
|
$width = $height;
|
|
$height = $temp;
|
|
}
|
|
|
|
return [
|
|
'width' => $width,
|
|
'height' => $height
|
|
];
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* @return array
|
|
*/
|
|
public function retrieveMetaData(): array {
|
|
global $wgPdfInfo, $wgPdftoText, $wgShellboxShell;
|
|
|
|
$command = MediaWikiServices::getInstance()->getShellCommandFactory()
|
|
->createBoxed( 'pdfhandler' )
|
|
->disableNetwork()
|
|
->firejailDefaultSeccomp()
|
|
->routeName( 'pdfhandler-metadata' );
|
|
|
|
$result = $command
|
|
->params( $wgShellboxShell, 'scripts/retrieveMetaData.sh' )
|
|
->inputFileFromFile(
|
|
'scripts/retrieveMetaData.sh',
|
|
__DIR__ . '/../scripts/retrieveMetaData.sh' )
|
|
->inputFileFromFile( 'file.pdf', $this->mFilename )
|
|
->outputFileToString( 'meta' )
|
|
->outputFileToString( 'pages' )
|
|
->outputFileToString( 'text' )
|
|
->outputFileToString( 'text_exit_code' )
|
|
->environment( [
|
|
'PDFHANDLER_INFO' => $wgPdfInfo,
|
|
'PDFHANDLER_TOTEXT' => $wgPdftoText,
|
|
] )
|
|
->execute();
|
|
|
|
// Record in statsd
|
|
MediaWikiServices::getInstance()->getStatsdDataFactory()
|
|
->increment( 'pdfhandler.shell.retrieve_meta_data' );
|
|
|
|
$resultMeta = $result->getFileContents( 'meta' );
|
|
$resultPages = $result->getFileContents( 'pages' );
|
|
if ( $resultMeta !== null || $resultPages !== null ) {
|
|
$data = $this->convertDumpToArray(
|
|
$resultMeta ?? '',
|
|
$resultPages ?? ''
|
|
);
|
|
} else {
|
|
$data = [];
|
|
}
|
|
|
|
// Read text layer
|
|
$retval = $result->wasReceived( 'text_exit_code' )
|
|
? (int)trim( $result->getFileContents( 'text_exit_code' ) )
|
|
: 1;
|
|
$txt = $result->getFileContents( 'text' );
|
|
if ( $retval == 0 && strlen( $txt ) ) {
|
|
$txt = str_replace( "\r\n", "\n", $txt );
|
|
$pages = explode( "\f", $txt );
|
|
foreach ( $pages as $page => $pageText ) {
|
|
// Get rid of invalid UTF-8, strip control characters
|
|
// Note we need to do this per page, as \f page feed would be stripped.
|
|
$pages[$page] = Validator::cleanUp( $pageText );
|
|
}
|
|
$data['text'] = $pages;
|
|
}
|
|
|
|
return $data;
|
|
}
|
|
|
|
/**
|
|
* @param string $metaDump
|
|
* @param string $infoDump
|
|
* @return array
|
|
*/
|
|
protected function convertDumpToArray( $metaDump, $infoDump ): array {
|
|
if ( strval( $infoDump ) === '' ) {
|
|
return [];
|
|
}
|
|
|
|
$lines = explode( "\n", $infoDump );
|
|
$data = [];
|
|
|
|
// Metadata is always the last item, and spans multiple lines.
|
|
$inMetadata = false;
|
|
|
|
// Basically this loop will go through each line, splitting key value
|
|
// pairs on the colon, until it gets to a "Metadata:\n" at which point
|
|
// it will gather all remaining lines into the xmp key.
|
|
foreach ( $lines as $line ) {
|
|
if ( $inMetadata ) {
|
|
// Handle XMP differently due to difference in line break
|
|
$data['xmp'] .= "\n$line";
|
|
continue;
|
|
}
|
|
$bits = explode( ':', $line, 2 );
|
|
if ( count( $bits ) > 1 ) {
|
|
$key = trim( $bits[0] );
|
|
if ( $key === 'Metadata' ) {
|
|
$inMetadata = true;
|
|
$data['xmp'] = '';
|
|
continue;
|
|
}
|
|
$value = trim( $bits[1] );
|
|
$matches = [];
|
|
// "Page xx rot" will be in poppler 0.20's pdfinfo output
|
|
// See https://bugs.freedesktop.org/show_bug.cgi?id=41867
|
|
if ( preg_match( '/^Page +(\d+) (size|rot)$/', $key, $matches ) ) {
|
|
$data['pages'][$matches[1]][$matches[2] == 'size' ? 'Page size' : 'Page rot'] = $value;
|
|
} else {
|
|
$data[$key] = $value;
|
|
}
|
|
}
|
|
}
|
|
$metaDump = trim( $metaDump );
|
|
if ( $metaDump !== '' ) {
|
|
$data['xmp'] = $metaDump;
|
|
}
|
|
|
|
return $this->postProcessDump( $data );
|
|
}
|
|
|
|
/**
|
|
* Postprocess the metadata (convert xmp into useful form, etc)
|
|
*
|
|
* This is used to generate the metadata table at the bottom
|
|
* of the image description page.
|
|
*
|
|
* @param array $data metadata
|
|
* @return array post-processed metadata
|
|
*/
|
|
protected function postProcessDump( array $data ) {
|
|
$meta = new BitmapMetadataHandler();
|
|
$items = [];
|
|
foreach ( $data as $key => $val ) {
|
|
switch ( $key ) {
|
|
case 'Title':
|
|
$items['ObjectName'] = $val;
|
|
break;
|
|
case 'Subject':
|
|
$items['ImageDescription'] = $val;
|
|
break;
|
|
case 'Keywords':
|
|
// Sometimes we have empty keywords. This seems
|
|
// to be a product of how pdfinfo deals with keywords
|
|
// with spaces in them. Filter such empty keywords
|
|
$keyList = array_filter( explode( ' ', $val ) );
|
|
if ( count( $keyList ) > 0 ) {
|
|
$items['Keywords'] = $keyList;
|
|
}
|
|
break;
|
|
case 'Author':
|
|
$items['Artist'] = $val;
|
|
break;
|
|
case 'Creator':
|
|
// Program used to create file.
|
|
// Different from program used to convert to pdf.
|
|
$items['Software'] = $val;
|
|
break;
|
|
case 'Producer':
|
|
// Conversion program
|
|
$items['pdf-Producer'] = $val;
|
|
break;
|
|
case 'ModTime':
|
|
$timestamp = wfTimestamp( TS_EXIF, $val );
|
|
if ( $timestamp ) {
|
|
// 'if' is just paranoia
|
|
$items['DateTime'] = $timestamp;
|
|
}
|
|
break;
|
|
case 'CreationTime':
|
|
$timestamp = wfTimestamp( TS_EXIF, $val );
|
|
if ( $timestamp ) {
|
|
$items['DateTimeDigitized'] = $timestamp;
|
|
}
|
|
break;
|
|
// These last two (version and encryption) I was unsure
|
|
// if we should include in the table, since they aren't
|
|
// all that useful to editors. I leaned on the side
|
|
// of including. However not including if file
|
|
// is optimized/linearized since that is really useless
|
|
// to an editor.
|
|
case 'PDF version':
|
|
$items['pdf-Version'] = $val;
|
|
break;
|
|
case 'Encrypted':
|
|
$items['pdf-Encrypted'] = $val;
|
|
break;
|
|
// Note 'pages' and 'Pages' are different keys (!)
|
|
case 'pages':
|
|
// A pdf document can have multiple sized pages in it.
|
|
// (However 95% of the time, all pages are the same size)
|
|
// get a list of all the unique page sizes in document.
|
|
// This doesn't do anything with rotation as of yet,
|
|
// mostly because I am unsure of what a good way to
|
|
// present that information to the user would be.
|
|
$pageSizes = [];
|
|
foreach ( $val as $page ) {
|
|
if ( isset( $page['Page size'] ) ) {
|
|
$pageSizes[$page['Page size']] = true;
|
|
}
|
|
}
|
|
|
|
$pageSizeArray = array_keys( $pageSizes );
|
|
if ( count( $pageSizeArray ) > 0 ) {
|
|
$items['pdf-PageSize'] = $pageSizeArray;
|
|
}
|
|
break;
|
|
}
|
|
|
|
}
|
|
$meta->addMetadata( $items, 'native' );
|
|
|
|
if ( isset( $data['xmp'] ) && XMPReader::isSupported() ) {
|
|
// @todo: This only handles generic xmp properties. Would be improved
|
|
// by handling pdf xmp properties (pdf and pdfx) via a hook.
|
|
$xmp = new XMPReader( LoggerFactory::getInstance( 'XMP' ) );
|
|
$xmp->parse( $data['xmp'] );
|
|
$xmpRes = $xmp->getResults();
|
|
foreach ( $xmpRes as $type => $xmpSection ) {
|
|
$meta->addMetadata( $xmpSection, $type );
|
|
}
|
|
}
|
|
unset( $data['xmp'] );
|
|
$data['mergedMetadata'] = $meta->getMetadataArray();
|
|
return $data;
|
|
}
|
|
}
|