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| 1 | <?php |
| 2 | |
| 3 | /** |
| 4 | * Handler for bitmap images with exif metadata. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License along |
| 17 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 18 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 19 | * http://www.gnu.org/copyleft/gpl.html |
| 20 | * |
| 21 | * @file |
| 22 | * @ingroup Media |
| 23 | */ |
| 24 | |
| 25 | use MediaWiki\Context\IContextSource; |
| 26 | use MediaWiki\MainConfigNames; |
| 27 | use MediaWiki\MediaWikiServices; |
| 28 | |
| 29 | /** |
| 30 | * Stuff specific to JPEG and (built-in) TIFF handler. |
| 31 | * All metadata related, since both JPEG and TIFF support Exif. |
| 32 | * |
| 33 | * @stable to extend |
| 34 | * @ingroup Media |
| 35 | */ |
| 36 | class ExifBitmapHandler extends BitmapHandler { |
| 37 | /** Error extracting metadata */ |
| 38 | public const BROKEN_FILE = '-1'; |
| 39 | |
| 40 | /** Outdated error extracting metadata */ |
| 41 | public const OLD_BROKEN_FILE = '0'; |
| 42 | |
| 43 | public function convertMetadataVersion( $metadata, $version = 1 ) { |
| 44 | // basically flattens arrays. |
| 45 | $version = is_int( $version ) ? $version : (int)explode( ';', $version, 2 )[0]; |
| 46 | if ( $version < 1 || $version >= 2 ) { |
| 47 | return $metadata; |
| 48 | } |
| 49 | |
| 50 | if ( !isset( $metadata['MEDIAWIKI_EXIF_VERSION'] ) || $metadata['MEDIAWIKI_EXIF_VERSION'] !== 2 ) { |
| 51 | return $metadata; |
| 52 | } |
| 53 | |
| 54 | // Treat Software as a special case because in can contain |
| 55 | // an array of (SoftwareName, Version). |
| 56 | if ( isset( $metadata['Software'] ) |
| 57 | && is_array( $metadata['Software'] ) |
| 58 | && is_array( $metadata['Software'][0] ) |
| 59 | && isset( $metadata['Software'][0][0] ) |
| 60 | && isset( $metadata['Software'][0][1] ) |
| 61 | ) { |
| 62 | $metadata['Software'] = $metadata['Software'][0][0] . ' (Version ' |
| 63 | . $metadata['Software'][0][1] . ')'; |
| 64 | } |
| 65 | |
| 66 | $formatter = new FormatMetadata; |
| 67 | |
| 68 | // ContactInfo also has to be dealt with specially |
| 69 | if ( isset( $metadata['Contact'] ) ) { |
| 70 | $metadata['Contact'] = $formatter->collapseContactInfo( |
| 71 | is_array( $metadata['Contact'] ) ? $metadata['Contact'] : [ $metadata['Contact'] ] |
| 72 | ); |
| 73 | } |
| 74 | |
| 75 | // Ignore Location shown if it is not a simple string |
| 76 | if ( isset( $metadata['LocationShown'] ) && !is_string( $metadata['LocationShown'] ) ) { |
| 77 | unset( $metadata['LocationShown'] ); |
| 78 | } |
| 79 | |
| 80 | foreach ( $metadata as &$val ) { |
| 81 | if ( is_array( $val ) ) { |
| 82 | // @phan-suppress-next-line SecurityCheck-DoubleEscaped Ambiguous with the true for nohtml |
| 83 | $val = $formatter->flattenArrayReal( $val, 'ul', true ); |
| 84 | } |
| 85 | } |
| 86 | unset( $val ); |
| 87 | $metadata['MEDIAWIKI_EXIF_VERSION'] = 1; |
| 88 | |
| 89 | return $metadata; |
| 90 | } |
| 91 | |
| 92 | /** |
| 93 | * @param File $image |
| 94 | * @return bool|int |
| 95 | */ |
| 96 | public function isFileMetadataValid( $image ) { |
| 97 | $showEXIF = MediaWikiServices::getInstance()->getMainConfig()->get( MainConfigNames::ShowEXIF ); |
| 98 | if ( !$showEXIF ) { |
| 99 | # Metadata disabled and so an empty field is expected |
| 100 | return self::METADATA_GOOD; |
| 101 | } |
| 102 | $exif = $image->getMetadataArray(); |
| 103 | if ( !$exif ) { |
| 104 | wfDebug( __METHOD__ . ': error unserializing?' ); |
| 105 | return self::METADATA_BAD; |
| 106 | } |
| 107 | if ( $exif === [ '_error' => self::OLD_BROKEN_FILE ] ) { |
| 108 | # Old special value indicating that there is no Exif data in the file. |
| 109 | # or that there was an error well extracting the metadata. |
| 110 | wfDebug( __METHOD__ . ": back-compat version" ); |
| 111 | return self::METADATA_COMPATIBLE; |
| 112 | } |
| 113 | |
| 114 | if ( $exif === [ '_error' => self::BROKEN_FILE ] ) { |
| 115 | return self::METADATA_GOOD; |
| 116 | } |
| 117 | |
| 118 | if ( !isset( $exif['MEDIAWIKI_EXIF_VERSION'] ) |
| 119 | || $exif['MEDIAWIKI_EXIF_VERSION'] !== Exif::version() |
| 120 | ) { |
| 121 | if ( isset( $exif['MEDIAWIKI_EXIF_VERSION'] ) |
| 122 | && $exif['MEDIAWIKI_EXIF_VERSION'] === 1 |
| 123 | ) { |
| 124 | // back-compatible but old |
| 125 | wfDebug( __METHOD__ . ": back-compat version" ); |
| 126 | |
| 127 | return self::METADATA_COMPATIBLE; |
| 128 | } |
| 129 | # Wrong (non-compatible) version |
| 130 | wfDebug( __METHOD__ . ": wrong version" ); |
| 131 | |
| 132 | return self::METADATA_BAD; |
| 133 | } |
| 134 | |
| 135 | return self::METADATA_GOOD; |
| 136 | } |
| 137 | |
| 138 | /** |
| 139 | * @param File $image |
| 140 | * @param IContextSource|false $context |
| 141 | * @return array[]|false |
| 142 | */ |
| 143 | public function formatMetadata( $image, $context = false ) { |
| 144 | $meta = $this->getCommonMetaArray( $image ); |
| 145 | if ( !$meta ) { |
| 146 | return false; |
| 147 | } |
| 148 | |
| 149 | return $this->formatMetadataHelper( $meta, $context ); |
| 150 | } |
| 151 | |
| 152 | public function getCommonMetaArray( File $file ) { |
| 153 | $exif = $file->getMetadataArray(); |
| 154 | if ( !$exif ) { |
| 155 | return []; |
| 156 | } |
| 157 | unset( $exif['MEDIAWIKI_EXIF_VERSION'] ); |
| 158 | |
| 159 | return $exif; |
| 160 | } |
| 161 | |
| 162 | public function getMetadataType( $image ) { |
| 163 | return 'exif'; |
| 164 | } |
| 165 | |
| 166 | protected function applyExifRotation( $info, $metadata ) { |
| 167 | if ( $this->autoRotateEnabled() ) { |
| 168 | $rotation = $this->getRotationForExifFromOrientation( $metadata['Orientation'] ?? null ); |
| 169 | } else { |
| 170 | $rotation = 0; |
| 171 | } |
| 172 | |
| 173 | if ( $rotation === 90 || $rotation === 270 ) { |
| 174 | $width = $info['width']; |
| 175 | $info['width'] = $info['height']; |
| 176 | $info['height'] = $width; |
| 177 | } |
| 178 | return $info; |
| 179 | } |
| 180 | |
| 181 | /** |
| 182 | * On supporting image formats, try to read out the low-level orientation |
| 183 | * of the file and return the angle that the file needs to be rotated to |
| 184 | * be viewed. |
| 185 | * |
| 186 | * This information is only useful when manipulating the original file; |
| 187 | * the width and height we normally work with is logical, and will match |
| 188 | * any produced output views. |
| 189 | * |
| 190 | * @param File $file |
| 191 | * @return int 0, 90, 180 or 270 |
| 192 | */ |
| 193 | public function getRotation( $file ) { |
| 194 | if ( !$this->autoRotateEnabled() ) { |
| 195 | return 0; |
| 196 | } |
| 197 | |
| 198 | $orientation = $file->getMetadataItem( 'Orientation' ); |
| 199 | return $this->getRotationForExifFromOrientation( $orientation ); |
| 200 | } |
| 201 | |
| 202 | /** |
| 203 | * Given a chunk of serialized Exif metadata, return the orientation as |
| 204 | * degrees of rotation. |
| 205 | * |
| 206 | * @param int|null $orientation |
| 207 | * @return int 0, 90, 180 or 270 |
| 208 | * @todo FIXME: Orientation can include flipping as well; see if this is an issue! |
| 209 | */ |
| 210 | protected function getRotationForExifFromOrientation( $orientation ) { |
| 211 | if ( $orientation === null ) { |
| 212 | return 0; |
| 213 | } |
| 214 | # See http://sylvana.net/jpegcrop/exif_orientation.html |
| 215 | switch ( $orientation ) { |
| 216 | case 8: |
| 217 | return 90; |
| 218 | case 3: |
| 219 | return 180; |
| 220 | case 6: |
| 221 | return 270; |
| 222 | default: |
| 223 | return 0; |
| 224 | } |
| 225 | } |
| 226 | } |