mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/PdfHandler
synced 2024-11-14 19:36:00 +00:00
329 lines
9 KiB
PHP
329 lines
9 KiB
PHP
<?php
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/**
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*
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* Copyright © 2007 Xarax <jodeldi@gmx.de>
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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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use MediaWiki\Logger\LoggerFactory;
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use MediaWiki\Shell\Shell;
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use UtfNormal\Validator;
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use Wikimedia\XMPReader\Reader as XMPReader;
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/**
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* inspired by djvuimage from Brion Vibber
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* modified and written by xarax
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*/
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class PdfImage {
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/**
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* @var string
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*/
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private $mFilename;
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/**
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* @param string $filename
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*/
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public function __construct( $filename ) {
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$this->mFilename = $filename;
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}
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/**
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* @return bool
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*/
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public function isValid() {
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return true;
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}
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/**
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* @return array|bool
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*/
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public function getImageSize() {
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$data = $this->retrieveMetadata();
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$size = self::getPageSize( $data, 1 );
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if ( $size ) {
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$width = $size['width'];
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$height = $size['height'];
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return [ $width, $height, 'Pdf',
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"width=\"$width\" height=\"$height\"" ];
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}
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return false;
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}
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/**
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* @param array $data
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* @param int $page
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* @return array|bool
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*/
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public static function getPageSize( $data, $page ) {
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global $wgPdfHandlerDpi;
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if ( isset( $data['pages'][$page]['Page size'] ) ) {
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$o = $data['pages'][$page]['Page size'];
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} elseif ( isset( $data['Page size'] ) ) {
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$o = $data['Page size'];
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} else {
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$o = false;
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}
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if ( $o ) {
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if ( isset( $data['pages'][$page]['Page rot'] ) ) {
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$r = $data['pages'][$page]['Page rot'];
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} elseif ( isset( $data['Page rot'] ) ) {
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$r = $data['Page rot'];
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} else {
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$r = 0;
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}
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$size = explode( 'x', $o, 2 );
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if ( $size ) {
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$width = intval( trim( $size[0] ) / 72 * $wgPdfHandlerDpi );
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$height = explode( ' ', trim( $size[1] ), 2 );
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$height = intval( trim( $height[0] ) / 72 * $wgPdfHandlerDpi );
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if ( ( $r / 90 ) & 1 ) {
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// Swap width and height for landscape pages
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$t = $width;
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$width = $height;
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$height = $t;
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}
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return [
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'width' => $width,
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'height' => $height
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];
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}
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}
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return false;
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}
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/**
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* @return array|bool|null
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*/
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public function retrieveMetaData() {
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global $wgPdfInfo, $wgPdftoText;
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if ( $wgPdfInfo ) {
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// Note in poppler 0.26 the -meta and page data options worked together,
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// but as of poppler 0.48 they must be queried separately.
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// https://bugs.freedesktop.org/show_bug.cgi?id=96801
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$cmdMeta = [
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$wgPdfInfo,
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'-enc', 'UTF-8', # Report metadata as UTF-8 text...
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'-meta', # Report XMP metadata
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$this->mFilename,
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];
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$resultMeta = Shell::command( $cmdMeta )
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->execute();
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$cmdPages = [
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$wgPdfInfo,
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'-enc', 'UTF-8', # Report metadata as UTF-8 text...
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'-l', '9999999', # Report page sizes for all pages
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$this->mFilename,
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];
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$resultPages = Shell::command( $cmdPages )
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->execute();
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$dump = $resultMeta->getStdout() . $resultPages->getStdout();
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$data = $this->convertDumpToArray( $dump );
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} else {
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$data = null;
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}
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// Read text layer
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if ( isset( $wgPdftoText ) ) {
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$cmd = [ $wgPdftoText, $this->mFilename, '-' ];
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$result = Shell::command( $cmd )
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->execute();
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$retval = $result->getExitCode();
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$txt = $result->getStdout();
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if ( $retval == 0 ) {
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$txt = str_replace( "\r\n", "\n", $txt );
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$pages = explode( "\f", $txt );
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foreach ( $pages as $page => $pageText ) {
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// Get rid of invalid UTF-8, strip control characters
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// Note we need to do this per page, as \f page feed would be stripped.
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$pages[$page] = Validator::cleanUp( $pageText );
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}
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$data['text'] = $pages;
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}
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}
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return $data;
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}
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/**
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* @param string $dump
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* @return array|bool
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*/
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protected function convertDumpToArray( $dump ) {
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if ( strval( $dump ) == '' ) {
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return false;
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}
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$lines = explode( "\n", $dump );
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$data = [];
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// Metadata is always the last item, and spans multiple lines.
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$inMetadata = false;
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// Basically this loop will go through each line, splitting key value
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// pairs on the colon, until it gets to a "Metadata:\n" at which point
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// it will gather all remaining lines into the xmp key.
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foreach ( $lines as $line ) {
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if ( $inMetadata ) {
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// Handle XMP differently due to diffence in line break
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$data['xmp'] .= "\n$line";
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continue;
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}
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$bits = explode( ':', $line, 2 );
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if ( count( $bits ) > 1 ) {
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$key = trim( $bits[0] );
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if ( $key === 'Metadata' ) {
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$inMetadata = true;
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$data['xmp'] = '';
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continue;
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}
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$value = trim( $bits[1] );
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$matches = [];
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// "Page xx rot" will be in poppler 0.20's pdfinfo output
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// See https://bugs.freedesktop.org/show_bug.cgi?id=41867
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if ( preg_match( '/^Page +(\d+) (size|rot)$/', $key, $matches ) ) {
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$data['pages'][$matches[1]][$matches[2] == 'size' ? 'Page size' : 'Page rot'] = $value;
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} else {
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$data[$key] = $value;
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}
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}
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}
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$data = $this->postProcessDump( $data );
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return $data;
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}
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/**
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* Postprocess the metadata (convert xmp into useful form, etc)
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*
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* This is used to generate the metadata table at the bottom
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* of the image description page.
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*
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* @param array $data metadata
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* @return array post-processed metadata
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*/
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protected function postProcessDump( array $data ) {
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$meta = new BitmapMetadataHandler();
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$items = [];
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foreach ( $data as $key => $val ) {
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switch ( $key ) {
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case 'Title':
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$items['ObjectName'] = $val;
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break;
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case 'Subject':
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$items['ImageDescription'] = $val;
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break;
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case 'Keywords':
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// Sometimes we have empty keywords. This seems
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// to be a product of how pdfinfo deals with keywords
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// with spaces in them. Filter such empty keywords
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$keyList = array_filter( explode( ' ', $val ) );
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if ( count( $keyList ) > 0 ) {
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$items['Keywords'] = $keyList;
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}
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break;
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case 'Author':
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$items['Artist'] = $val;
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break;
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case 'Creator':
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// Program used to create file.
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// Different from program used to convert to pdf.
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$items['Software'] = $val;
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break;
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case 'Producer':
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// Conversion program
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$items['pdf-Producer'] = $val;
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break;
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case 'ModTime':
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$timestamp = wfTimestamp( TS_EXIF, $val );
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if ( $timestamp ) {
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// 'if' is just paranoia
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$items['DateTime'] = $timestamp;
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}
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break;
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case 'CreationTime':
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$timestamp = wfTimestamp( TS_EXIF, $val );
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if ( $timestamp ) {
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$items['DateTimeDigitized'] = $timestamp;
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}
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break;
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// These last two (version and encryption) I was unsure
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// if we should include in the table, since they aren't
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// all that useful to editors. I leaned on the side
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// of including. However not including if file
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// is optimized/linearized since that is really useless
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// to an editor.
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case 'PDF version':
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$items['pdf-Version'] = $val;
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break;
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case 'Encrypted':
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// @todo: The value isn't i18n-ised. The appropriate
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// place to do that is in FormatMetadata.php
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// should add a hook a there.
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// For reference, if encrypted this fields value looks like:
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// "yes (print:yes copy:no change:no addNotes:no)"
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$items['pdf-Encrypted'] = $val;
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break;
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// Note 'pages' and 'Pages' are different keys (!)
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case 'pages':
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// A pdf document can have multiple sized pages in it.
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// (However 95% of the time, all pages are the same size)
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// get a list of all the unique page sizes in document.
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// This doesn't do anything with rotation as of yet,
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// mostly because I am unsure of what a good way to
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// present that information to the user would be.
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$pageSizes = [];
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foreach ( $val as $page ) {
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if ( isset( $page['Page size'] ) ) {
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$pageSizes[$page['Page size']] = true;
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}
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}
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$pageSizeArray = array_keys( $pageSizes );
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if ( count( $pageSizeArray ) > 0 ) {
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$items['pdf-PageSize'] = $pageSizeArray;
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}
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break;
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}
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}
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$meta->addMetadata( $items, 'native' );
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if ( isset( $data['xmp'] ) && XMPReader::isSupported() ) {
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// @todo: This only handles generic xmp properties. Would be improved
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// by handling pdf xmp properties (pdf and pdfx) via a hook.
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$xmp = new XMPReader( LoggerFactory::getInstance( 'XMP' ) );
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$xmp->parse( $data['xmp'] );
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$xmpRes = $xmp->getResults();
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foreach ( $xmpRes as $type => $xmpSection ) {
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$meta->addMetadata( $xmpSection, $type );
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}
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}
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unset( $data['xmp'] );
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$data['mergedMetadata'] = $meta->getMetadataArray();
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return $data;
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}
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}
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