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| 1 | <?php |
| 2 | /** |
| 3 | * Entry point implementation for retrieving media thumbnails, created by a MediaHandler |
| 4 | * subclass or proxy request if FileRepo::getThumbProxyUrl is configured. |
| 5 | * |
| 6 | * This also supports resizing an image on-demand, if it isn't found in the |
| 7 | * configured FileBackend storage. |
| 8 | * |
| 9 | * @see /thumb.php The web entry point. |
| 10 | * |
| 11 | * This program is free software; you can redistribute it and/or modify |
| 12 | * it under the terms of the GNU General Public License as published by |
| 13 | * the Free Software Foundation; either version 2 of the License, or |
| 14 | * (at your option) any later version. |
| 15 | * |
| 16 | * This program is distributed in the hope that it will be useful, |
| 17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 19 | * GNU General Public License for more details. |
| 20 | * |
| 21 | * You should have received a copy of the GNU General Public License along |
| 22 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 23 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 24 | * http://www.gnu.org/copyleft/gpl.html |
| 25 | * |
| 26 | * @file |
| 27 | * @ingroup entrypoint |
| 28 | * @ingroup Media |
| 29 | */ |
| 30 | |
| 31 | namespace MediaWiki\FileRepo; |
| 32 | |
| 33 | use Exception; |
| 34 | use File; |
| 35 | use InvalidArgumentException; |
| 36 | use MediaTransformError; |
| 37 | use MediaTransformInvalidParametersException; |
| 38 | use MediaTransformOutput; |
| 39 | use MediaWiki\Logger\LoggerFactory; |
| 40 | use MediaWiki\MainConfigNames; |
| 41 | use MediaWiki\MediaWikiEntryPoint; |
| 42 | use MediaWiki\MediaWikiServices; |
| 43 | use MediaWiki\Message\Message; |
| 44 | use MediaWiki\Permissions\PermissionStatus; |
| 45 | use MediaWiki\PoolCounter\PoolCounterWorkViaCallback; |
| 46 | use MediaWiki\Profiler\ProfilingContext; |
| 47 | use MediaWiki\Request\HeaderCallback; |
| 48 | use MediaWiki\Status\Status; |
| 49 | use MediaWiki\Title\Title; |
| 50 | use RepoGroup; |
| 51 | use UnregisteredLocalFile; |
| 52 | use Wikimedia\AtEase\AtEase; |
| 53 | use Wikimedia\Message\MessageSpecifier; |
| 54 | |
| 55 | class ThumbnailEntryPoint extends MediaWikiEntryPoint { |
| 56 | |
| 57 | /** @var string[] */ |
| 58 | private $varyHeader = []; |
| 59 | |
| 60 | /** |
| 61 | * Main entry point |
| 62 | */ |
| 63 | public function execute() { |
| 64 | global $wgTrivialMimeDetection; |
| 65 | |
| 66 | ProfilingContext::singleton()->init( |
| 67 | MW_ENTRY_POINT, |
| 68 | 'stream' |
| 69 | ); |
| 70 | |
| 71 | // Don't use fancy MIME detection, just check the file extension for jpg/gif/png. |
| 72 | // NOTE: This only works as long as to StreamFile::contentTypeFromPath |
| 73 | // get this setting from global state. When StreamFile gets refactored, |
| 74 | // we need to find a better way. |
| 75 | $wgTrivialMimeDetection = true; |
| 76 | |
| 77 | $this->handleRequest(); |
| 78 | } |
| 79 | |
| 80 | protected function doPrepareForOutput() { |
| 81 | // No-op. |
| 82 | // Do not call parent::doPrepareForOutput() to avoid |
| 83 | // commitMainTransaction() getting called. |
| 84 | } |
| 85 | |
| 86 | protected function handleRequest() { |
| 87 | $this->streamThumb( $this->getRequest()->getQueryValuesOnly() ); |
| 88 | } |
| 89 | |
| 90 | private function getRepoGroup(): RepoGroup { |
| 91 | return $this->getServiceContainer()->getRepoGroup(); |
| 92 | } |
| 93 | |
| 94 | /** |
| 95 | * Stream a thumbnail specified by parameters |
| 96 | * |
| 97 | * @param array $params List of thumbnailing parameters. In addition to parameters |
| 98 | * passed to the MediaHandler, this may also includes the keys: |
| 99 | * f (for filename), archived (if archived file), temp (if temp file), |
| 100 | * w (alias for width), p (alias for page), r (ignored; historical), |
| 101 | * rel404 (path for render on 404 to verify hash path correct), |
| 102 | * thumbName (thumbnail name to potentially extract more parameters from |
| 103 | * e.g. 'lossy-page1-120px-Foo.tiff' would add page, lossy and width |
| 104 | * to the parameters) |
| 105 | * |
| 106 | * @return void |
| 107 | */ |
| 108 | protected function streamThumb( array $params ) { |
| 109 | $headers = []; // HTTP headers to send |
| 110 | |
| 111 | $fileName = $params['f'] ?? ''; |
| 112 | |
| 113 | // Backwards compatibility parameters |
| 114 | if ( isset( $params['w'] ) ) { |
| 115 | $params['width'] = $params['w']; |
| 116 | unset( $params['w'] ); |
| 117 | } |
| 118 | if ( isset( $params['width'] ) && substr( $params['width'], -2 ) == 'px' ) { |
| 119 | // strip the px (pixel) suffix, if found |
| 120 | $params['width'] = substr( $params['width'], 0, -2 ); |
| 121 | } |
| 122 | if ( isset( $params['p'] ) ) { |
| 123 | $params['page'] = $params['p']; |
| 124 | } |
| 125 | |
| 126 | // Is this a thumb of an archived file? |
| 127 | $isOld = ( isset( $params['archived'] ) && $params['archived'] ); |
| 128 | unset( $params['archived'] ); // handlers don't care |
| 129 | |
| 130 | // Is this a thumb of a temp file? |
| 131 | $isTemp = ( isset( $params['temp'] ) && $params['temp'] ); |
| 132 | unset( $params['temp'] ); // handlers don't care |
| 133 | |
| 134 | $services = $this->getServiceContainer(); |
| 135 | |
| 136 | // Some basic input validation |
| 137 | $fileName = strtr( $fileName, '\\/', '__' ); |
| 138 | $localRepo = $services->getRepoGroup()->getLocalRepo(); |
| 139 | $archiveTimestamp = null; |
| 140 | |
| 141 | // Actually fetch the image. Method depends on whether it is archived or not. |
| 142 | if ( $isTemp ) { |
| 143 | $repo = $localRepo->getTempRepo(); |
| 144 | $img = new UnregisteredLocalFile( false, $repo, |
| 145 | # Temp files are hashed based on the name without the timestamp. |
| 146 | # The thumbnails will be hashed based on the entire name however. |
| 147 | # @todo fix this convention to actually be reasonable. |
| 148 | $repo->getZonePath( 'public' ) . '/' . $repo->getTempHashPath( $fileName ) . $fileName |
| 149 | ); |
| 150 | } elseif ( $isOld ) { |
| 151 | // Format is <timestamp>!<name> |
| 152 | $bits = explode( '!', $fileName, 2 ); |
| 153 | if ( count( $bits ) != 2 ) { |
| 154 | $this->thumbError( 404, $this->getContext()->msg( 'badtitletext' )->parse() ); |
| 155 | return; |
| 156 | } |
| 157 | $archiveTimestamp = $bits[0]; |
| 158 | $title = Title::makeTitleSafe( NS_FILE, $bits[1] ); |
| 159 | if ( !$title ) { |
| 160 | $this->thumbError( 404, $this->getContext()->msg( 'badtitletext' )->parse() ); |
| 161 | return; |
| 162 | } |
| 163 | $img = $localRepo->newFromArchiveName( $title, $fileName ); |
| 164 | } else { |
| 165 | $img = $localRepo->newFile( $fileName ); |
| 166 | } |
| 167 | |
| 168 | // Check the source file title |
| 169 | if ( !$img ) { |
| 170 | $this->thumbError( 404, $this->getContext()->msg( 'badtitletext' )->parse() ); |
| 171 | return; |
| 172 | } |
| 173 | |
| 174 | // Check permissions if there are read restrictions |
| 175 | if ( $this->maybeDenyAccess( $img ) ) { |
| 176 | return; |
| 177 | } |
| 178 | |
| 179 | // Check if the file is hidden |
| 180 | if ( $img->isDeleted( File::DELETED_FILE ) ) { |
| 181 | $this->thumbErrorText( 404, "The source file '$fileName' does not exist." ); |
| 182 | return; |
| 183 | } |
| 184 | |
| 185 | // Do rendering parameters extraction from thumbnail name. |
| 186 | if ( isset( $params['thumbName'] ) ) { |
| 187 | $params = $this->extractThumbParams( $img, $params ); |
| 188 | } |
| 189 | if ( $params == null ) { |
| 190 | $this->thumbErrorText( 400, 'The specified thumbnail parameters are not recognized.' ); |
| 191 | return; |
| 192 | } |
| 193 | |
| 194 | // Check the source file storage path |
| 195 | if ( !$img->exists() ) { |
| 196 | $redirected = $this->maybeDoRedirect( |
| 197 | $img, |
| 198 | $params, |
| 199 | $isTemp, |
| 200 | $isOld, |
| 201 | $archiveTimestamp |
| 202 | ); |
| 203 | |
| 204 | if ( !$redirected ) { |
| 205 | // If it's not a redirect that has a target as a local file, give 404. |
| 206 | $this->thumbErrorText( |
| 207 | 404, |
| 208 | "The source file '$fileName' does not exist." |
| 209 | ); |
| 210 | } |
| 211 | |
| 212 | $this->applyVaryHeader(); |
| 213 | |
| 214 | return; |
| 215 | } elseif ( $img->getPath() === false ) { |
| 216 | $this->thumbErrorText( 400, "The source file '$fileName' is not locally accessible." ); |
| 217 | return; |
| 218 | } |
| 219 | |
| 220 | // Check IMS against the source file |
| 221 | // This means that clients can keep a cached copy even after it has been deleted on the server |
| 222 | if ( $this->maybeNotModified( $img ) ) { |
| 223 | return; |
| 224 | } |
| 225 | |
| 226 | $rel404 = $params['rel404'] ?? null; |
| 227 | unset( $params['r'] ); // ignore 'r' because we unconditionally pass File::RENDER |
| 228 | unset( $params['f'] ); // We're done with 'f' parameter. |
| 229 | unset( $params['rel404'] ); // moved to $rel404 |
| 230 | |
| 231 | // Get the normalized thumbnail name from the parameters... |
| 232 | try { |
| 233 | $thumbName = $img->thumbName( $params ); |
| 234 | if ( ( $thumbName ?? '' ) === '' ) { // invalid params? |
| 235 | throw new MediaTransformInvalidParametersException( |
| 236 | 'Empty return from File::thumbName' |
| 237 | ); |
| 238 | } |
| 239 | $thumbName2 = $img->thumbName( $params, File::THUMB_FULL_NAME ); // b/c; "long" style |
| 240 | } catch ( MediaTransformInvalidParametersException $e ) { |
| 241 | $this->thumbErrorText( |
| 242 | 400, |
| 243 | 'The specified thumbnail parameters are not valid: ' . $e->getMessage() |
| 244 | ); |
| 245 | |
| 246 | return; |
| 247 | } |
| 248 | |
| 249 | // For 404 handled thumbnails, we only use the base name of the URI |
| 250 | // for the thumb params and the parent directory for the source file name. |
| 251 | // Check that the zone relative path matches up so CDN caches won't pick |
| 252 | // up thumbs that would not be purged on source file deletion (T36231). |
| 253 | if ( $rel404 !== null ) { // thumbnail was handled via 404 |
| 254 | if ( |
| 255 | $this->maybeNormalizeRel404Path( |
| 256 | $img, |
| 257 | $rel404, |
| 258 | $thumbName, |
| 259 | $thumbName2 |
| 260 | ) |
| 261 | ) { |
| 262 | $this->applyVaryHeader(); |
| 263 | |
| 264 | return; |
| 265 | } |
| 266 | } |
| 267 | |
| 268 | $dispositionType = isset( $params['download'] ) ? 'attachment' : 'inline'; |
| 269 | |
| 270 | // Suggest a good name for users downloading this thumbnail |
| 271 | $headers[] = |
| 272 | 'Content-Disposition: ' . $img->getThumbDisposition( $thumbName, $dispositionType ); |
| 273 | |
| 274 | $this->applyVaryHeader(); |
| 275 | |
| 276 | // Stream the file if it exists already... |
| 277 | $thumbPath = $img->getThumbPath( $thumbName ); |
| 278 | |
| 279 | if ( $this->maybeStreamExistingThumbnail( $img, $thumbName, $thumbPath, $headers ) ) { |
| 280 | return; |
| 281 | } |
| 282 | |
| 283 | if ( $this->maybeEnforceRateLimits( $img, $params ) ) { |
| 284 | return; |
| 285 | } |
| 286 | |
| 287 | $thumbProxyUrl = $img->getRepo()->getThumbProxyUrl(); |
| 288 | |
| 289 | if ( ( $thumbProxyUrl ?? '' ) !== '' ) { |
| 290 | $this->proxyThumbnailRequest( $img, $thumbName ); |
| 291 | // No local fallback when in proxy mode |
| 292 | return; |
| 293 | } else { |
| 294 | // Generate the thumbnail locally |
| 295 | [ $thumb, $errorMsg, $errorCode ] = $this->generateThumbnail( $img, $params, $thumbName, $thumbPath ); |
| 296 | } |
| 297 | |
| 298 | $this->prepareForOutput(); |
| 299 | |
| 300 | if ( !$thumb ) { |
| 301 | $errorMsg ??= 'unknown error'; // Just to make Phan happy, shouldn't happen. |
| 302 | $this->thumbError( $errorCode, $errorMsg, null, [ 'file' => $thumbName, 'path' => $thumbPath ] ); |
| 303 | } else { |
| 304 | // Stream the file if there were no errors |
| 305 | /** @var MediaTransformOutput $thumb */ |
| 306 | '@phan-var MediaTransformOutput $thumb'; |
| 307 | $status = $thumb->streamFileWithStatus( $headers ); |
| 308 | if ( !$status->isOK() ) { |
| 309 | $this->thumbError( 500, 'Could not stream the file', $status->getWikiText( false, false, 'en' ), [ |
| 310 | 'file' => $thumbName, 'path' => $thumbPath, |
| 311 | 'error' => $status->getWikiText( false, false, 'en' ) ] ); |
| 312 | } |
| 313 | } |
| 314 | } |
| 315 | |
| 316 | /** |
| 317 | * Proxies thumbnail request to a service that handles thumbnailing |
| 318 | * |
| 319 | * @param File $img |
| 320 | * @param string $thumbName |
| 321 | */ |
| 322 | private function proxyThumbnailRequest( $img, $thumbName ) { |
| 323 | $thumbProxyUrl = $img->getRepo()->getThumbProxyUrl(); |
| 324 | |
| 325 | // Instead of generating the thumbnail ourselves, we proxy the request to another service |
| 326 | $thumbProxiedUrl = $thumbProxyUrl . $img->getThumbRel( $thumbName ); |
| 327 | |
| 328 | $req = MediaWikiServices::getInstance()->getHttpRequestFactory()->create( $thumbProxiedUrl, [], __METHOD__ ); |
| 329 | $secret = $img->getRepo()->getThumbProxySecret(); |
| 330 | |
| 331 | // Pass a secret key shared with the proxied service if any |
| 332 | if ( ( $secret ?? '' ) !== '' ) { |
| 333 | $req->setHeader( 'X-Swift-Secret', $secret ); |
| 334 | } |
| 335 | |
| 336 | // Send request to proxied service |
| 337 | $req->execute(); |
| 338 | |
| 339 | HeaderCallback::warnIfHeadersSent(); |
| 340 | |
| 341 | // Simply serve the response from the proxied service as-is |
| 342 | $this->header( 'HTTP/1.1 ' . $req->getStatus() ); |
| 343 | |
| 344 | $headers = $req->getResponseHeaders(); |
| 345 | |
| 346 | foreach ( $headers as $key => $values ) { |
| 347 | foreach ( $values as $value ) { |
| 348 | $this->header( $key . ': ' . $value, false ); |
| 349 | } |
| 350 | } |
| 351 | |
| 352 | $this->print( $req->getContent() ); |
| 353 | } |
| 354 | |
| 355 | /** |
| 356 | * Actually try to generate a new thumbnail |
| 357 | * |
| 358 | * @param File $file |
| 359 | * @param array $params |
| 360 | * @param string $thumbName |
| 361 | * @param string $thumbPath |
| 362 | * @return array [ $thumb, $errorHtml, $errorCode ], which will be |
| 363 | * either [MediaTransformOutput, null, int] or [null, string, int]. |
| 364 | * @phan-return array{0:?MediaTransformOutput, 1:?string, 2:int} |
| 365 | */ |
| 366 | protected function generateThumbnail( File $file, array $params, $thumbName, $thumbPath ) { |
| 367 | $attemptFailureEpoch = $this->getConfig( MainConfigNames::AttemptFailureEpoch ); |
| 368 | |
| 369 | $services = MediaWikiServices::getInstance()->getObjectCacheFactory(); |
| 370 | |
| 371 | $cache = $services->getLocalClusterInstance(); |
| 372 | $key = $cache->makeKey( |
| 373 | 'attempt-failures', |
| 374 | $attemptFailureEpoch, |
| 375 | $file->getRepo()->getName(), |
| 376 | $file->getSha1(), |
| 377 | md5( $thumbName ) |
| 378 | ); |
| 379 | |
| 380 | // Check if this file keeps failing to render |
| 381 | if ( $cache->get( $key ) >= 4 ) { |
| 382 | return [ |
| 383 | null, |
| 384 | $this->getContext()->msg( 'thumbnail_image-failure-limit', 4 )->escaped(), |
| 385 | 500, |
| 386 | ]; |
| 387 | } |
| 388 | |
| 389 | $done = false; |
| 390 | // Record failures on PHP fatals in addition to caching exceptions |
| 391 | register_shutdown_function( static function () use ( $cache, &$done, $key ) { |
| 392 | if ( !$done ) { // transform() gave a fatal |
| 393 | // Randomize TTL to reduce stampedes |
| 394 | $cache->incrWithInit( $key, $cache::TTL_HOUR + mt_rand( 0, 300 ) ); |
| 395 | } |
| 396 | } ); |
| 397 | |
| 398 | /** @var MediaTransformOutput $thumb|null */ |
| 399 | $thumb = null; |
| 400 | $errorHtml = null; |
| 401 | '@phan-var MediaTransformOutput $thumb|false'; |
| 402 | |
| 403 | // guard thumbnail rendering with PoolCounter to avoid stampedes |
| 404 | // expensive files use a separate PoolCounter config so it is possible |
| 405 | // to set up a global limit on them |
| 406 | if ( $file->isExpensiveToThumbnail() ) { |
| 407 | $poolCounterType = 'FileRenderExpensive'; |
| 408 | } else { |
| 409 | $poolCounterType = 'FileRender'; |
| 410 | } |
| 411 | |
| 412 | // Thumbnail isn't already there, so create the new thumbnail... |
| 413 | try { |
| 414 | $work = new PoolCounterWorkViaCallback( $poolCounterType, sha1( $file->getName() ), |
| 415 | [ |
| 416 | 'doWork' => static function () use ( $file, $params ) { |
| 417 | return $file->transform( $params, File::RENDER_NOW ); |
| 418 | }, |
| 419 | 'doCachedWork' => static function () use ( $file, $params, $thumbPath ) { |
| 420 | // If the worker that finished made this thumbnail then use it. |
| 421 | // Otherwise, it probably made a different thumbnail for this file. |
| 422 | return $file->getRepo()->fileExists( $thumbPath ) |
| 423 | ? $file->transform( $params, File::RENDER_NOW ) |
| 424 | : false; // retry once more in exclusive mode |
| 425 | }, |
| 426 | 'error' => function ( Status $status ) { |
| 427 | return $this->getContext()->msg( 'generic-pool-error' )->parse() . '<hr>' . $status->getHTML(); |
| 428 | } |
| 429 | ] |
| 430 | ); |
| 431 | $result = $work->execute(); |
| 432 | if ( $result instanceof MediaTransformOutput ) { |
| 433 | $thumb = $result; |
| 434 | } elseif ( is_string( $result ) ) { // error |
| 435 | $errorHtml = $result; |
| 436 | } |
| 437 | } catch ( Exception $e ) { |
| 438 | // Tried to select a page on a non-paged file? |
| 439 | } |
| 440 | |
| 441 | /** @noinspection PhpUnusedLocalVariableInspection */ |
| 442 | $done = true; // no PHP fatal occurred |
| 443 | |
| 444 | if ( !$thumb || $thumb->isError() ) { |
| 445 | // Randomize TTL to reduce stampedes |
| 446 | $cache->incrWithInit( $key, $cache::TTL_HOUR + mt_rand( 0, 300 ) ); |
| 447 | } |
| 448 | |
| 449 | // Check for thumbnail generation errors... |
| 450 | $msg = $this->getContext()->msg( 'thumbnail_error' ); |
| 451 | $errorCode = null; |
| 452 | |
| 453 | if ( !$thumb ) { |
| 454 | $errorHtml = $errorHtml ?: $msg->rawParams( 'File::transform() returned false' ); |
| 455 | $errorCode = 500; |
| 456 | } elseif ( $thumb instanceof MediaTransformError ) { |
| 457 | $errorHtml = $thumb->getMsg(); |
| 458 | $errorCode = $thumb->getHttpStatusCode(); |
| 459 | } elseif ( !$thumb->hasFile() ) { |
| 460 | $errorHtml = $msg->rawParams( 'No path supplied in thumbnail object' ); |
| 461 | $errorCode = 500; |
| 462 | } elseif ( $thumb->fileIsSource() ) { |
| 463 | $errorHtml = $msg |
| 464 | ->rawParams( 'Image was not scaled, is the requested width bigger than the source?' ); |
| 465 | $errorCode = 400; |
| 466 | } |
| 467 | |
| 468 | if ( $errorCode && $errorHtml ) { |
| 469 | if ( $errorHtml instanceof MessageSpecifier && |
| 470 | $errorHtml->getKey() === 'thumbnail_image-failure-limit' |
| 471 | ) { |
| 472 | $errorCode = 429; |
| 473 | } |
| 474 | |
| 475 | if ( $errorHtml instanceof Message ) { |
| 476 | $errorHtml = $errorHtml->escaped(); |
| 477 | } |
| 478 | |
| 479 | return [ null, $errorHtml, $errorCode ]; |
| 480 | } |
| 481 | |
| 482 | return [ $thumb, null, 200 ]; |
| 483 | } |
| 484 | |
| 485 | /** |
| 486 | * Convert a thumbnail name (122px-foo.png) to parameters, using |
| 487 | * file handler. |
| 488 | * |
| 489 | * @param File $file File object for file in question |
| 490 | * @param array $params Array of parameters so far |
| 491 | * @return array|null Parameters array with more parameters, or null |
| 492 | */ |
| 493 | private function extractThumbParams( $file, $params ) { |
| 494 | if ( !isset( $params['thumbName'] ) ) { |
| 495 | throw new InvalidArgumentException( "No thumbnail name passed to extractThumbParams" ); |
| 496 | } |
| 497 | |
| 498 | $thumbname = $params['thumbName']; |
| 499 | unset( $params['thumbName'] ); |
| 500 | |
| 501 | // FIXME: Files in the temp zone don't set a MIME type, which means |
| 502 | // they don't have a handler. Which means we can't parse the param |
| 503 | // string. However, not a big issue as what good is a param string |
| 504 | // if you have no handler to make use of the param string and |
| 505 | // actually generate the thumbnail. |
| 506 | $handler = $file->getHandler(); |
| 507 | |
| 508 | // Based on UploadStash::parseKey |
| 509 | $fileNamePos = strrpos( $thumbname, $params['f'] ); |
| 510 | if ( $fileNamePos === false ) { |
| 511 | // Maybe using a short filename? (see FileRepo::nameForThumb) |
| 512 | $fileNamePos = strrpos( $thumbname, 'thumbnail' ); |
| 513 | } |
| 514 | |
| 515 | if ( $handler && $fileNamePos !== false ) { |
| 516 | $paramString = substr( $thumbname, 0, $fileNamePos - 1 ); |
| 517 | $extraParams = $handler->parseParamString( $paramString ); |
| 518 | if ( $extraParams !== false ) { |
| 519 | return $params + $extraParams; |
| 520 | } |
| 521 | } |
| 522 | |
| 523 | // As a last ditch fallback, use the traditional common parameters |
| 524 | if ( preg_match( '!^(page(\d*)-)*(\d*)px-[^/]*$!', $thumbname, $matches ) ) { |
| 525 | [ /* all */, /* pagefull */, $pagenum, $size ] = $matches; |
| 526 | $params['width'] = $size; |
| 527 | if ( $pagenum ) { |
| 528 | $params['page'] = $pagenum; |
| 529 | } |
| 530 | return $params; // valid thumbnail URL |
| 531 | } |
| 532 | return null; |
| 533 | } |
| 534 | |
| 535 | /** |
| 536 | * Output a thumbnail generation error message |
| 537 | * |
| 538 | * @param int $status |
| 539 | * @param string $msgText Plain text (will be html escaped) |
| 540 | * @return void |
| 541 | */ |
| 542 | protected function thumbErrorText( $status, $msgText ) { |
| 543 | $this->thumbError( $status, htmlspecialchars( $msgText, ENT_NOQUOTES ) ); |
| 544 | } |
| 545 | |
| 546 | /** |
| 547 | * Output a thumbnail generation error message |
| 548 | * |
| 549 | * @param int $status |
| 550 | * @param string $msgHtml HTML |
| 551 | * @param string|null $msgText Short error description, for internal logging. Defaults to $msgHtml. |
| 552 | * Only used for HTTP 500 errors. |
| 553 | * @param array $context Error context, for internal logging. Only used for HTTP 500 errors. |
| 554 | * @return void |
| 555 | */ |
| 556 | protected function thumbError( $status, $msgHtml, $msgText = null, $context = [] ) { |
| 557 | $showHostnames = $this->getConfig( MainConfigNames::ShowHostnames ); |
| 558 | |
| 559 | HeaderCallback::warnIfHeadersSent(); |
| 560 | |
| 561 | if ( $this->getResponse()->headersSent() ) { |
| 562 | LoggerFactory::getInstance( 'thumbnail' )->error( |
| 563 | 'Error after output had been started. Output may be corrupt or truncated. ' . |
| 564 | 'Original error: ' . ( $msgText ?: $msgHtml ) . " (Status $status)", |
| 565 | $context |
| 566 | ); |
| 567 | return; |
| 568 | } |
| 569 | |
| 570 | $this->header( 'Cache-Control: no-cache' ); |
| 571 | $this->header( 'Content-Type: text/html; charset=utf-8' ); |
| 572 | if ( $status == 400 || $status == 404 || $status == 429 ) { |
| 573 | $this->status( $status ); |
| 574 | } elseif ( $status == 403 ) { |
| 575 | $this->status( 403 ); |
| 576 | $this->header( 'Vary: Cookie' ); |
| 577 | } else { |
| 578 | LoggerFactory::getInstance( 'thumbnail' )->error( $msgText ?: $msgHtml, $context ); |
| 579 | $this->status( 500 ); |
| 580 | } |
| 581 | if ( $showHostnames ) { |
| 582 | $this->header( 'X-MW-Thumbnail-Renderer: ' . wfHostname() ); |
| 583 | $url = htmlspecialchars( |
| 584 | $this->getServerInfo( 'REQUEST_URI' ) ?? '', |
| 585 | ENT_NOQUOTES |
| 586 | ); |
| 587 | $hostname = htmlspecialchars( wfHostname(), ENT_NOQUOTES ); |
| 588 | $debug = "<!-- $url -->\n<!-- $hostname -->\n"; |
| 589 | } else { |
| 590 | $debug = ''; |
| 591 | } |
| 592 | $content = <<<EOT |
| 593 | <!DOCTYPE html> |
| 594 | <html><head> |
| 595 | <meta charset="UTF-8" /> |
| 596 | <meta name="color-scheme" content="light dark" /> |
| 597 | <title>Error generating thumbnail</title> |
| 598 | </head> |
| 599 | <body> |
| 600 | <h1>Error generating thumbnail</h1> |
| 601 | <p> |
| 602 | $msgHtml |
| 603 | </p> |
| 604 | $debug |
| 605 | </body> |
| 606 | </html> |
| 607 | |
| 608 | EOT; |
| 609 | $this->header( 'Content-Length: ' . strlen( $content ) ); |
| 610 | $this->print( $content ); |
| 611 | } |
| 612 | |
| 613 | /** |
| 614 | * @return bool true if redirected |
| 615 | */ |
| 616 | private function maybeDoRedirect( |
| 617 | File $img, |
| 618 | array $params, |
| 619 | bool $isTemp, |
| 620 | bool $isOld, |
| 621 | ?string $archiveTimestamp |
| 622 | ): bool { |
| 623 | $varyOnXFP = $this->getConfig( MainConfigNames::VaryOnXFP ); |
| 624 | |
| 625 | $redirectedLocation = false; |
| 626 | if ( !$isTemp ) { |
| 627 | // Check for file redirect |
| 628 | // Since redirects are associated with pages, not versions of files, |
| 629 | // we look for the most current version to see if its a redirect. |
| 630 | $localRepo = $this->getRepoGroup()->getLocalRepo(); |
| 631 | $possRedirFile = $localRepo->findFile( $img->getName() ); |
| 632 | if ( $possRedirFile && $possRedirFile->getRedirected() !== null ) { |
| 633 | $redirTarget = $possRedirFile->getName(); |
| 634 | $targetFile = $localRepo->newFile( |
| 635 | Title::makeTitleSafe( |
| 636 | NS_FILE, |
| 637 | $redirTarget |
| 638 | ) |
| 639 | ); |
| 640 | if ( $targetFile->exists() ) { |
| 641 | $newThumbName = $targetFile->thumbName( $params ); |
| 642 | if ( $isOld ) { |
| 643 | $newThumbUrl = $targetFile->getArchiveThumbUrl( |
| 644 | $archiveTimestamp . '!' . $targetFile->getName(), |
| 645 | $newThumbName |
| 646 | ); |
| 647 | } else { |
| 648 | $newThumbUrl = $targetFile->getThumbUrl( $newThumbName ); |
| 649 | } |
| 650 | $redirectedLocation = $this->getUrlUtils()->expand( |
| 651 | $newThumbUrl, |
| 652 | PROTO_CURRENT |
| 653 | ) ?? false; |
| 654 | } |
| 655 | } |
| 656 | } |
| 657 | |
| 658 | if ( $redirectedLocation ) { |
| 659 | // File has been moved. Give redirect. |
| 660 | $response = $this->getResponse(); |
| 661 | $response->statusHeader( 302 ); |
| 662 | $response->header( 'Location: ' . $redirectedLocation ); |
| 663 | $response->header( |
| 664 | 'Expires: ' . gmdate( 'D, d M Y H:i:s', time() + 12 * 3600 ) . ' GMT' |
| 665 | ); |
| 666 | if ( $varyOnXFP ) { |
| 667 | $this->vary( 'X-Forwarded-Proto' ); |
| 668 | } |
| 669 | $response->header( 'Content-Length: 0' ); |
| 670 | |
| 671 | return true; |
| 672 | } |
| 673 | |
| 674 | return false; |
| 675 | } |
| 676 | |
| 677 | private function vary( $header ) { |
| 678 | $this->varyHeader[] = $header; |
| 679 | } |
| 680 | |
| 681 | private function applyVaryHeader() { |
| 682 | if ( count( $this->varyHeader ) ) { |
| 683 | $this->header( 'Vary: ' . implode( ', ', $this->varyHeader ) ); |
| 684 | } |
| 685 | } |
| 686 | |
| 687 | /** |
| 688 | * @return bool true if access was denied |
| 689 | */ |
| 690 | private function maybeDenyAccess( File $img ): bool { |
| 691 | $permissionLookup = $this->getServiceContainer()->getGroupPermissionsLookup(); |
| 692 | |
| 693 | if ( !$permissionLookup->groupHasPermission( '*', 'read' ) ) { |
| 694 | $authority = $this->getContext()->getAuthority(); |
| 695 | $imgTitle = $img->getTitle(); |
| 696 | |
| 697 | if ( !$imgTitle || !$authority->authorizeRead( 'read', $imgTitle ) ) { |
| 698 | $this->thumbErrorText( |
| 699 | 403, |
| 700 | 'Access denied. You do not have permission to access the source file.' |
| 701 | ); |
| 702 | |
| 703 | return true; |
| 704 | } |
| 705 | $this->header( 'Cache-Control: private' ); |
| 706 | $this->vary( 'Cookie' ); |
| 707 | } |
| 708 | |
| 709 | return false; |
| 710 | } |
| 711 | |
| 712 | /** |
| 713 | * @return bool true if not modified |
| 714 | */ |
| 715 | private function maybeNotModified( File $img ): bool { |
| 716 | if ( $this->getServerInfo( 'HTTP_IF_MODIFIED_SINCE', '' ) !== '' ) { |
| 717 | // Fix IE brokenness |
| 718 | $imsString = preg_replace( |
| 719 | '/;.*$/', |
| 720 | '', |
| 721 | $this->getServerInfo( 'HTTP_IF_MODIFIED_SINCE' ) ?? '' |
| 722 | ); |
| 723 | |
| 724 | // Calculate time |
| 725 | AtEase::suppressWarnings(); |
| 726 | $imsUnix = strtotime( $imsString ); |
| 727 | AtEase::restoreWarnings(); |
| 728 | if ( wfTimestamp( TS_UNIX, $img->getTimestamp() ) <= $imsUnix ) { |
| 729 | $this->status( 304 ); |
| 730 | |
| 731 | return true; |
| 732 | } |
| 733 | } |
| 734 | |
| 735 | return false; |
| 736 | } |
| 737 | |
| 738 | /** |
| 739 | * @param File $img |
| 740 | * @param string $rel404 |
| 741 | * @param string|false $thumbName |
| 742 | * @param string|false $thumbName2 |
| 743 | * |
| 744 | * @return bool |
| 745 | */ |
| 746 | private function maybeNormalizeRel404Path( |
| 747 | File $img, |
| 748 | string $rel404, |
| 749 | $thumbName, |
| 750 | $thumbName2 |
| 751 | ): bool { |
| 752 | $varyOnXFP = $this->getConfig( MainConfigNames::VaryOnXFP ); |
| 753 | |
| 754 | if ( rawurldecode( $rel404 ) === $img->getThumbRel( $thumbName ) ) { |
| 755 | // Request for the canonical thumbnail name |
| 756 | return false; |
| 757 | } elseif ( rawurldecode( $rel404 ) === $img->getThumbRel( $thumbName2 ) ) { |
| 758 | // Request for the "long" thumbnail name; redirect to canonical name |
| 759 | $target = $this->getUrlUtils()->expand( |
| 760 | $img->getThumbUrl( $thumbName ), |
| 761 | PROTO_CURRENT |
| 762 | ) ?? false; |
| 763 | $this->status( 301 ); |
| 764 | $this->header( 'Location: ' . $target ); |
| 765 | $this->header( |
| 766 | 'Expires: ' . gmdate( 'D, d M Y H:i:s', time() + 7 * 86400 ) . ' GMT' |
| 767 | ); |
| 768 | |
| 769 | if ( $varyOnXFP ) { |
| 770 | $this->vary( 'X-Forwarded-Proto' ); |
| 771 | } |
| 772 | |
| 773 | return true; |
| 774 | } else { |
| 775 | $this->thumbErrorText( |
| 776 | 404, |
| 777 | "The given path of the specified thumbnail is incorrect; expected '" . |
| 778 | $img->getThumbRel( $thumbName ) . "' but got '" . rawurldecode( $rel404 ) . "'." |
| 779 | ); |
| 780 | |
| 781 | return true; |
| 782 | } |
| 783 | } |
| 784 | |
| 785 | /** |
| 786 | * @return bool true if we attempted to stream the thumb, even if it failed. |
| 787 | */ |
| 788 | private function maybeStreamExistingThumbnail( |
| 789 | File $img, |
| 790 | string $thumbName, |
| 791 | string $thumbPath, |
| 792 | array $headers |
| 793 | ): bool { |
| 794 | $stats = $this->getServiceContainer()->getStatsFactory(); |
| 795 | |
| 796 | if ( $img->getRepo()->fileExists( $thumbPath ) ) { |
| 797 | $starttime = microtime( true ); |
| 798 | $status = $img->getRepo()->streamFileWithStatus( |
| 799 | $thumbPath, |
| 800 | $headers |
| 801 | ); |
| 802 | $streamtime = microtime( true ) - $starttime; |
| 803 | |
| 804 | if ( $status->isOK() ) { |
| 805 | $stats->getTiming( 'media_thumbnail_stream_seconds' ) |
| 806 | ->copyToStatsdAt( 'media.thumbnail.stream' ) |
| 807 | ->observe( $streamtime * 1000 ); |
| 808 | } else { |
| 809 | $this->thumbError( |
| 810 | 500, |
| 811 | 'Could not stream the file', |
| 812 | $status->getWikiText( false, false, 'en' ), |
| 813 | [ |
| 814 | 'file' => $thumbName, |
| 815 | 'path' => $thumbPath, |
| 816 | 'error' => $status->getWikiText( false, false, 'en' ), |
| 817 | ] |
| 818 | ); |
| 819 | } |
| 820 | |
| 821 | return true; |
| 822 | } |
| 823 | |
| 824 | return false; |
| 825 | } |
| 826 | |
| 827 | private function maybeEnforceRateLimits( File $img, array $params ) { |
| 828 | $authority = $this->getContext()->getAuthority(); |
| 829 | $status = PermissionStatus::newEmpty(); |
| 830 | |
| 831 | if ( !wfThumbIsStandard( $img, $params ) |
| 832 | && !$authority->authorizeAction( 'renderfile-nonstandard', $status ) |
| 833 | ) { |
| 834 | $statusFormatter = $this->getServiceContainer()->getFormatterFactory() |
| 835 | ->getStatusFormatter( $this->getContext() ); |
| 836 | |
| 837 | $this->thumbError( 429, $statusFormatter->getHTML( $status ) ); |
| 838 | return true; |
| 839 | } elseif ( !$authority->authorizeAction( 'renderfile', $status ) ) { |
| 840 | $statusFormatter = $this->getServiceContainer()->getFormatterFactory() |
| 841 | ->getStatusFormatter( $this->getContext() ); |
| 842 | |
| 843 | $this->thumbError( 429, $statusFormatter->getHTML( $status ) ); |
| 844 | return true; |
| 845 | } |
| 846 | |
| 847 | return false; |
| 848 | } |
| 849 | |
| 850 | } |