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<?php /** * Handler for bitmap images with exif metadata. * * 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 * * @file * @ingroup Media */ use MediaWiki\Context\IContextSource; use MediaWiki\MainConfigNames; use MediaWiki\MediaWikiServices; /** * Stuff specific to JPEG and (built-in) TIFF handler. * All metadata related, since both JPEG and TIFF support Exif. * * @stable to extend * @ingroup Media */ class ExifBitmapHandler extends BitmapHandler { /** Error extracting metadata */ public const BROKEN_FILE = '-1'; /** Outdated error extracting metadata */ public const OLD_BROKEN_FILE = '0'; public function convertMetadataVersion( $metadata, $version = 1 ) { // basically flattens arrays. $version = is_int( $version ) ? $version : (int)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 if it is not a simple string if ( isset( $metadata['LocationShown'] ) && !is_string( $metadata['LocationShown'] ) ) { unset( $metadata['LocationShown'] ); } 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 ); } } unset( $val ); $metadata['MEDIAWIKI_EXIF_VERSION'] = 1; return $metadata; } /** * @param File $image * @return bool|int */ 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; } /** * @param File $image * @param IContextSource|false $context * @return array[]|false */ 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; } /** * On supporting image formats, try to read out the low-level orientation * of the file and return the angle that the file needs to be rotated to * be viewed. * * This information is only useful when manipulating the original file; * the width and height we normally work with is logical, and will match * any produced output views. * * @param File $file * @return int 0, 90, 180 or 270 */ public function getRotation( $file ) { if ( !$this->autoRotateEnabled() ) { return 0; } $orientation = $file->getMetadataItem( 'Orientation' ); return $this->getRotationForExifFromOrientation( $orientation ); } /** * Given a chunk of serialized Exif metadata, return the orientation as * degrees of rotation. * * @param int|null $orientation * @return int 0, 90, 180 or 270 * @todo FIXME: Orientation can include flipping as well; see if this is an issue! */ 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; } } }
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