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| 1 | <?php |
| 2 | /** |
| 3 | * Handler for DjVu images. |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation; either version 2 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License along |
| 16 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 18 | * http://www.gnu.org/copyleft/gpl.html |
| 19 | * |
| 20 | * @file |
| 21 | * @ingroup Media |
| 22 | */ |
| 23 | |
| 24 | use MediaWiki\MainConfigNames; |
| 25 | use MediaWiki\MediaWikiServices; |
| 26 | use MediaWiki\PoolCounter\PoolCounterWorkViaCallback; |
| 27 | use MediaWiki\Shell\Shell; |
| 28 | |
| 29 | /** |
| 30 | * Handler for DjVu images |
| 31 | * |
| 32 | * @ingroup Media |
| 33 | */ |
| 34 | class DjVuHandler extends ImageHandler { |
| 35 | private const EXPENSIVE_SIZE_LIMIT = 10_485_760; // 10MiB |
| 36 | |
| 37 | // Constants for getHandlerState |
| 38 | private const STATE_DJVU_IMAGE = 'djvuImage'; |
| 39 | private const STATE_TEXT_TREE = 'djvuTextTree'; |
| 40 | private const STATE_META_TREE = 'djvuMetaTree'; |
| 41 | private const CACHE_VERSION = 'v2'; |
| 42 | |
| 43 | /** |
| 44 | * @return bool |
| 45 | */ |
| 46 | public function isEnabled() { |
| 47 | $djvuRenderer = MediaWikiServices::getInstance()->getMainConfig()->get( MainConfigNames::DjvuRenderer ); |
| 48 | $djvuDump = MediaWikiServices::getInstance()->getMainConfig()->get( MainConfigNames::DjvuDump ); |
| 49 | if ( !$djvuRenderer || !$djvuDump ) { |
| 50 | wfDebug( "DjVu is disabled, please set \$wgDjvuRenderer and \$wgDjvuDump" ); |
| 51 | |
| 52 | return false; |
| 53 | } |
| 54 | return true; |
| 55 | } |
| 56 | |
| 57 | /** |
| 58 | * @param File $file |
| 59 | * @return bool |
| 60 | */ |
| 61 | public function mustRender( $file ) { |
| 62 | return true; |
| 63 | } |
| 64 | |
| 65 | /** |
| 66 | * True if creating thumbnails from the file is large or otherwise resource-intensive. |
| 67 | * @param File $file |
| 68 | * @return bool |
| 69 | */ |
| 70 | public function isExpensiveToThumbnail( $file ) { |
| 71 | return $file->getSize() > static::EXPENSIVE_SIZE_LIMIT; |
| 72 | } |
| 73 | |
| 74 | /** |
| 75 | * @param File $file |
| 76 | * @return bool |
| 77 | */ |
| 78 | public function isMultiPage( $file ) { |
| 79 | return true; |
| 80 | } |
| 81 | |
| 82 | /** |
| 83 | * @return array |
| 84 | */ |
| 85 | public function getParamMap() { |
| 86 | return [ |
| 87 | 'img_width' => 'width', |
| 88 | 'img_page' => 'page', |
| 89 | ]; |
| 90 | } |
| 91 | |
| 92 | /** |
| 93 | * @param string $name |
| 94 | * @param mixed $value |
| 95 | * @return bool |
| 96 | */ |
| 97 | public function validateParam( $name, $value ) { |
| 98 | if ( $name === 'page' && trim( $value ) !== (string)intval( $value ) ) { |
| 99 | // Extra junk on the end of page, probably actually a caption |
| 100 | // e.g. [[File:Foo.djvu|thumb|Page 3 of the document shows foo]] |
| 101 | return false; |
| 102 | } |
| 103 | return in_array( $name, [ 'width', 'height', 'page' ] ) && $value > 0; |
| 104 | } |
| 105 | |
| 106 | /** |
| 107 | * @param array $params |
| 108 | * @return string|false |
| 109 | */ |
| 110 | public function makeParamString( $params ) { |
| 111 | $page = $params['page'] ?? 1; |
| 112 | if ( !isset( $params['width'] ) ) { |
| 113 | return false; |
| 114 | } |
| 115 | |
| 116 | return "page{$page}-{$params['width']}px"; |
| 117 | } |
| 118 | |
| 119 | /** |
| 120 | * @param string $str |
| 121 | * @return array|false |
| 122 | */ |
| 123 | public function parseParamString( $str ) { |
| 124 | $m = false; |
| 125 | if ( preg_match( '/^page(\d+)-(\d+)px$/', $str, $m ) ) { |
| 126 | return [ 'width' => $m[2], 'page' => $m[1] ]; |
| 127 | } |
| 128 | return false; |
| 129 | } |
| 130 | |
| 131 | /** |
| 132 | * @param array $params |
| 133 | * @return array |
| 134 | */ |
| 135 | protected function getScriptParams( $params ) { |
| 136 | return [ |
| 137 | 'width' => $params['width'], |
| 138 | 'page' => $params['page'], |
| 139 | ]; |
| 140 | } |
| 141 | |
| 142 | /** |
| 143 | * @param File $image |
| 144 | * @param string $dstPath |
| 145 | * @param string $dstUrl |
| 146 | * @param array $params |
| 147 | * @param int $flags |
| 148 | * @return MediaTransformError|ThumbnailImage|TransformParameterError |
| 149 | */ |
| 150 | public function doTransform( $image, $dstPath, $dstUrl, $params, $flags = 0 ) { |
| 151 | $djvuRenderer = MediaWikiServices::getInstance()->getMainConfig()->get( MainConfigNames::DjvuRenderer ); |
| 152 | $djvuPostProcessor = MediaWikiServices::getInstance()->getMainConfig() |
| 153 | ->get( MainConfigNames::DjvuPostProcessor ); |
| 154 | if ( !$this->normaliseParams( $image, $params ) ) { |
| 155 | return new TransformParameterError( $params ); |
| 156 | } |
| 157 | $width = $params['width']; |
| 158 | $height = $params['height']; |
| 159 | $page = $params['page']; |
| 160 | |
| 161 | if ( $flags & self::TRANSFORM_LATER ) { |
| 162 | $params = [ |
| 163 | 'width' => $width, |
| 164 | 'height' => $height, |
| 165 | 'page' => $page |
| 166 | ]; |
| 167 | |
| 168 | return new ThumbnailImage( $image, $dstUrl, $dstPath, $params ); |
| 169 | } |
| 170 | |
| 171 | if ( !wfMkdirParents( dirname( $dstPath ), null, __METHOD__ ) ) { |
| 172 | return new MediaTransformError( |
| 173 | 'thumbnail_error', |
| 174 | $width, |
| 175 | $height, |
| 176 | wfMessage( 'thumbnail_dest_directory' ) |
| 177 | ); |
| 178 | } |
| 179 | |
| 180 | // Get local copy source for shell scripts |
| 181 | // Thumbnail extraction is very inefficient for large files. |
| 182 | // Provide a way to pool count limit the number of downloaders. |
| 183 | if ( $image->getSize() >= 1e7 ) { // 10 MB |
| 184 | $work = new PoolCounterWorkViaCallback( 'GetLocalFileCopy', sha1( $image->getName() ), |
| 185 | [ |
| 186 | 'doWork' => static function () use ( $image ) { |
| 187 | return $image->getLocalRefPath(); |
| 188 | } |
| 189 | ] |
| 190 | ); |
| 191 | $srcPath = $work->execute(); |
| 192 | } else { |
| 193 | $srcPath = $image->getLocalRefPath(); |
| 194 | } |
| 195 | |
| 196 | if ( $srcPath === false ) { // Failed to get local copy |
| 197 | wfDebugLog( 'thumbnail', |
| 198 | sprintf( 'Thumbnail failed on %s: could not get local copy of "%s"', |
| 199 | wfHostname(), $image->getName() ) ); |
| 200 | |
| 201 | return new MediaTransformError( 'thumbnail_error', |
| 202 | $params['width'], $params['height'], |
| 203 | wfMessage( 'filemissing' ) |
| 204 | ); |
| 205 | } |
| 206 | |
| 207 | # Use a subshell (brackets) to aggregate stderr from both pipeline commands |
| 208 | # before redirecting it to the overall stdout. This works in both Linux and Windows XP. |
| 209 | $cmd = '(' . Shell::escape( |
| 210 | $djvuRenderer, |
| 211 | "-format=ppm", |
| 212 | "-page={$page}", |
| 213 | "-size={$params['physicalWidth']}x{$params['physicalHeight']}", |
| 214 | $srcPath ); |
| 215 | if ( $djvuPostProcessor ) { |
| 216 | $cmd .= " | {$djvuPostProcessor}"; |
| 217 | } |
| 218 | $cmd .= ' > ' . Shell::escape( $dstPath ) . ') 2>&1'; |
| 219 | wfDebug( __METHOD__ . ": $cmd" ); |
| 220 | $retval = 0; |
| 221 | $err = wfShellExec( $cmd, $retval ); |
| 222 | |
| 223 | $removed = $this->removeBadFile( $dstPath, $retval ); |
| 224 | if ( $retval !== 0 || $removed ) { |
| 225 | $this->logErrorForExternalProcess( $retval, $err, $cmd ); |
| 226 | return new MediaTransformError( 'thumbnail_error', $width, $height, $err ); |
| 227 | } |
| 228 | $params = [ |
| 229 | 'width' => $width, |
| 230 | 'height' => $height, |
| 231 | 'page' => $page |
| 232 | ]; |
| 233 | |
| 234 | return new ThumbnailImage( $image, $dstUrl, $dstPath, $params ); |
| 235 | } |
| 236 | |
| 237 | /** |
| 238 | * Cache an instance of DjVuImage in a MediaHandlerState object, return |
| 239 | * that instance |
| 240 | * |
| 241 | * @param MediaHandlerState $state |
| 242 | * @param string $path |
| 243 | * @return DjVuImage |
| 244 | */ |
| 245 | private function getDjVuImage( $state, $path ) { |
| 246 | $deja = $state->getHandlerState( self::STATE_DJVU_IMAGE ); |
| 247 | if ( !$deja ) { |
| 248 | $deja = new DjVuImage( $path ); |
| 249 | $state->setHandlerState( self::STATE_DJVU_IMAGE, $deja ); |
| 250 | } |
| 251 | return $deja; |
| 252 | } |
| 253 | |
| 254 | /** |
| 255 | * Get metadata, unserializing it if necessary. |
| 256 | * |
| 257 | * @param File $file The DjVu file in question |
| 258 | * @param bool $gettext |
| 259 | * @return string|false|array metadata |
| 260 | */ |
| 261 | private function getMetadataInternal( File $file, $gettext ) { |
| 262 | $itemNames = [ 'error', '_error', 'data' ]; |
| 263 | if ( $gettext ) { |
| 264 | $itemNames[] = 'text'; |
| 265 | } |
| 266 | $unser = $file->getMetadataItems( $itemNames ); |
| 267 | |
| 268 | if ( isset( $unser['error'] ) ) { |
| 269 | return false; |
| 270 | } |
| 271 | if ( isset( $unser['_error'] ) ) { |
| 272 | return false; |
| 273 | } |
| 274 | return $unser; |
| 275 | } |
| 276 | |
| 277 | /** |
| 278 | * Cache a document tree for the DjVu metadata |
| 279 | * @param File $image |
| 280 | * @param bool $gettext DOCUMENT (Default: false) |
| 281 | * @return false|array |
| 282 | */ |
| 283 | public function getMetaTree( $image, $gettext = false ) { |
| 284 | if ( $gettext && $image->getHandlerState( self::STATE_TEXT_TREE ) ) { |
| 285 | return $image->getHandlerState( self::STATE_TEXT_TREE ); |
| 286 | } |
| 287 | if ( !$gettext && $image->getHandlerState( self::STATE_META_TREE ) ) { |
| 288 | return $image->getHandlerState( self::STATE_META_TREE ); |
| 289 | } |
| 290 | |
| 291 | $metadata = $this->getMetadataInternal( $image, $gettext ); |
| 292 | if ( !$metadata ) { |
| 293 | return false; |
| 294 | } |
| 295 | |
| 296 | if ( !$gettext ) { |
| 297 | unset( $metadata['text'] ); |
| 298 | } |
| 299 | return $metadata; |
| 300 | } |
| 301 | |
| 302 | public function getThumbType( $ext, $mime, $params = null ) { |
| 303 | $djvuOutputExtension = MediaWikiServices::getInstance()->getMainConfig() |
| 304 | ->get( MainConfigNames::DjvuOutputExtension ); |
| 305 | static $djvuMime = null; |
| 306 | if ( $djvuMime === null ) { |
| 307 | $magic = MediaWikiServices::getInstance()->getMimeAnalyzer(); |
| 308 | $djvuMime = $magic->getMimeTypeFromExtensionOrNull( $djvuOutputExtension ); |
| 309 | } |
| 310 | |
| 311 | return [ $djvuOutputExtension, $djvuMime ]; |
| 312 | } |
| 313 | |
| 314 | public function getSizeAndMetadata( $state, $path ) { |
| 315 | wfDebug( "Getting DjVu metadata for $path" ); |
| 316 | |
| 317 | $djvuImage = $this->getDjVuImage( $state, $path ); |
| 318 | $metadata = $djvuImage->retrieveMetaData(); |
| 319 | if ( $metadata === false ) { |
| 320 | // Special value so that we don't repetitively try and decode a broken file. |
| 321 | $metadata = [ 'error' => 'Error extracting metadata' ]; |
| 322 | } |
| 323 | return [ 'metadata' => $metadata ] + $djvuImage->getImageSize(); |
| 324 | } |
| 325 | |
| 326 | public function getMetadataType( $image ) { |
| 327 | // historical reasons |
| 328 | return 'djvuxml'; |
| 329 | } |
| 330 | |
| 331 | public function isFileMetadataValid( $image ) { |
| 332 | return $image->getMetadataArray() ? self::METADATA_GOOD : self::METADATA_BAD; |
| 333 | } |
| 334 | |
| 335 | public function pageCount( File $image ) { |
| 336 | $info = $this->getDimensionInfo( $image ); |
| 337 | |
| 338 | return $info ? $info['pageCount'] : false; |
| 339 | } |
| 340 | |
| 341 | public function getPageDimensions( File $image, $page ) { |
| 342 | $index = $page - 1; // MW starts pages at 1 |
| 343 | |
| 344 | $info = $this->getDimensionInfo( $image ); |
| 345 | if ( $info && isset( $info['dimensionsByPage'][$index] ) ) { |
| 346 | return $info['dimensionsByPage'][$index]; |
| 347 | } |
| 348 | |
| 349 | return false; |
| 350 | } |
| 351 | |
| 352 | protected function getDimensionInfo( File $file ) { |
| 353 | $cache = MediaWikiServices::getInstance()->getMainWANObjectCache(); |
| 354 | return $cache->getWithSetCallback( |
| 355 | $cache->makeKey( 'file-djvu', 'dimensions', self::CACHE_VERSION, $file->getSha1() ), |
| 356 | $cache::TTL_INDEFINITE, |
| 357 | function () use ( $file ) { |
| 358 | $tree = $this->getMetaTree( $file ); |
| 359 | return $this->getDimensionInfoFromMetaTree( $tree ); |
| 360 | }, |
| 361 | [ 'pcTTL' => $cache::TTL_INDEFINITE ] |
| 362 | ); |
| 363 | } |
| 364 | |
| 365 | /** |
| 366 | * Given the metadata, returns dimension information about the document |
| 367 | * @param false|array $metatree The file's metadata tree |
| 368 | * @return array|false |
| 369 | */ |
| 370 | protected function getDimensionInfoFromMetaTree( $metatree ) { |
| 371 | if ( !$metatree ) { |
| 372 | return false; |
| 373 | } |
| 374 | $dimsByPage = []; |
| 375 | |
| 376 | if ( !isset( $metatree['data'] ) || !$metatree['data'] ) { |
| 377 | return false; |
| 378 | } |
| 379 | foreach ( $metatree['data']['pages'] as $page ) { |
| 380 | if ( !$page ) { |
| 381 | $dimsByPage[] = false; |
| 382 | } else { |
| 383 | $dimsByPage[] = [ |
| 384 | 'width' => (int)$page['width'], |
| 385 | 'height' => (int)$page['height'], |
| 386 | ]; |
| 387 | } |
| 388 | } |
| 389 | return [ |
| 390 | 'pageCount' => count( $metatree['data']['pages'] ), |
| 391 | 'dimensionsByPage' => $dimsByPage |
| 392 | ]; |
| 393 | } |
| 394 | |
| 395 | /** |
| 396 | * @param File $image |
| 397 | * @param int $page Page number to get information for |
| 398 | * @return string|false Page text or false when no text found. |
| 399 | */ |
| 400 | public function getPageText( File $image, $page ) { |
| 401 | $tree = $this->getMetaTree( $image, true ); |
| 402 | if ( !$tree ) { |
| 403 | return false; |
| 404 | } |
| 405 | if ( isset( $tree['text'] ) && isset( $tree['text'][$page - 1] ) ) { |
| 406 | return $tree['text'][$page - 1]; |
| 407 | } |
| 408 | return false; |
| 409 | } |
| 410 | |
| 411 | public function useSplitMetadata() { |
| 412 | return true; |
| 413 | } |
| 414 | } |