ExifBitmapHandler.php

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<?php
 
use MediaWiki\MainConfigNames;
use MediaWiki\MediaWikiServices;
 
class ExifBitmapHandler extends BitmapHandler {
    public const BROKEN_FILE = '-1';
 
    public const OLD_BROKEN_FILE = '0';
 
    public function convertMetadataVersion( $metadata, $version = 1 ) {
        // basically flattens arrays.
        $version = is_int( $version ) ? $version : intval( explode( ';', $version, 2 )[0] );
        if ( $version < 1 || $version >= 2 ) {
            return $metadata;
        }
 
        if ( !isset( $metadata['MEDIAWIKI_EXIF_VERSION'] ) || $metadata['MEDIAWIKI_EXIF_VERSION'] != 2 ) {
            return $metadata;
        }
 
        // Treat Software as a special case because in can contain
        // an array of (SoftwareName, Version).
        if ( isset( $metadata['Software'] )
            && is_array( $metadata['Software'] )
            && is_array( $metadata['Software'][0] )
            && isset( $metadata['Software'][0][0] )
            && isset( $metadata['Software'][0][1] )
        ) {
            $metadata['Software'] = $metadata['Software'][0][0] . ' (Version '
                . $metadata['Software'][0][1] . ')';
        }
 
        $formatter = new FormatMetadata;
 
        // ContactInfo also has to be dealt with specially
        if ( isset( $metadata['Contact'] ) ) {
            $metadata['Contact'] = $formatter->collapseContactInfo(
                is_array( $metadata['Contact'] ) ? $metadata['Contact'] : [ $metadata['Contact'] ]
            );
        }
 
        // Ignore Location shown/created if they are not simple strings
        foreach ( [ 'LocationShown', 'LocationCreated' ] as $metadataKey ) {
            if ( isset( $metadata[ $metadataKey ] ) && !is_string( $metadata[ $metadataKey ] ) ) {
                unset( $metadata[ $metadataKey ] );
            }
        }
 
        foreach ( $metadata as &$val ) {
            if ( is_array( $val ) ) {
                // @phan-suppress-next-line SecurityCheck-DoubleEscaped Ambiguous with the true for nohtml
                $val = $formatter->flattenArrayReal( $val, 'ul', true );
            }
        }
        $metadata['MEDIAWIKI_EXIF_VERSION'] = 1;
 
        return $metadata;
    }
 
    public function isFileMetadataValid( $image ) {
        $showEXIF = MediaWikiServices::getInstance()->getMainConfig()->get( MainConfigNames::ShowEXIF );
        if ( !$showEXIF ) {
            # Metadata disabled and so an empty field is expected
            return self::METADATA_GOOD;
        }
        $exif = $image->getMetadataArray();
        if ( !$exif ) {
            wfDebug( __METHOD__ . ': error unserializing?' );
            return self::METADATA_BAD;
        }
        if ( $exif === [ '_error' => self::OLD_BROKEN_FILE ] ) {
            # Old special value indicating that there is no Exif data in the file.
            # or that there was an error well extracting the metadata.
            wfDebug( __METHOD__ . ": back-compat version" );
            return self::METADATA_COMPATIBLE;
        }
 
        if ( $exif === [ '_error' => self::BROKEN_FILE ] ) {
            return self::METADATA_GOOD;
        }
 
        if ( !isset( $exif['MEDIAWIKI_EXIF_VERSION'] )
            || $exif['MEDIAWIKI_EXIF_VERSION'] != Exif::version()
        ) {
            if ( isset( $exif['MEDIAWIKI_EXIF_VERSION'] )
                && $exif['MEDIAWIKI_EXIF_VERSION'] == 1
            ) {
                // back-compatible but old
                wfDebug( __METHOD__ . ": back-compat version" );
 
                return self::METADATA_COMPATIBLE;
            }
            # Wrong (non-compatible) version
            wfDebug( __METHOD__ . ": wrong version" );
 
            return self::METADATA_BAD;
        }
 
        return self::METADATA_GOOD;
    }
 
    public function formatMetadata( $image, $context = false ) {
        $meta = $this->getCommonMetaArray( $image );
        if ( !$meta ) {
            return false;
        }
 
        return $this->formatMetadataHelper( $meta, $context );
    }
 
    public function getCommonMetaArray( File $file ) {
        $exif = $file->getMetadataArray();
        if ( !$exif ) {
            return [];
        }
        unset( $exif['MEDIAWIKI_EXIF_VERSION'] );
 
        return $exif;
    }
 
    public function getMetadataType( $image ) {
        return 'exif';
    }
 
    protected function applyExifRotation( $info, $metadata ) {
        if ( $this->autoRotateEnabled() ) {
            $rotation = $this->getRotationForExifFromOrientation( $metadata['Orientation'] ?? null );
        } else {
            $rotation = 0;
        }
 
        if ( $rotation == 90 || $rotation == 270 ) {
            $width = $info['width'];
            $info['width'] = $info['height'];
            $info['height'] = $width;
        }
        return $info;
    }
 
    public function getRotation( $file ) {
        if ( !$this->autoRotateEnabled() ) {
            return 0;
        }
 
        $orientation = $file->getMetadataItem( 'Orientation' );
        return $this->getRotationForExifFromOrientation( $orientation );
    }
 
    protected function getRotationForExifFromOrientation( $orientation ) {
        if ( $orientation === null ) {
            return 0;
        }
        # See http://sylvana.net/jpegcrop/exif_orientation.html
        switch ( $orientation ) {
            case 8:
                return 90;
            case 3:
                return 180;
            case 6:
                return 270;
            default:
                return 0;
        }
    }
}