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| 1 | <?php |
| 2 | /** |
| 3 | * This file is part of MediaWiki. |
| 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 | */ |
| 22 | |
| 23 | namespace MediaWiki\Revision; |
| 24 | |
| 25 | use InvalidArgumentException; |
| 26 | use LogicException; |
| 27 | use MediaWiki\Content\Content; |
| 28 | use MediaWiki\Content\Renderer\ContentRenderer; |
| 29 | use MediaWiki\Page\PageReference; |
| 30 | use MediaWiki\Parser\ParserOptions; |
| 31 | use MediaWiki\Parser\ParserOutput; |
| 32 | use MediaWiki\Parser\ParserOutputFlags; |
| 33 | use MediaWiki\Permissions\Authority; |
| 34 | use Psr\Log\LoggerInterface; |
| 35 | use Psr\Log\NullLogger; |
| 36 | use Wikimedia\Assert\Assert; |
| 37 | |
| 38 | /** |
| 39 | * RenderedRevision represents the rendered representation of a revision. It acts as a lazy provider |
| 40 | * of ParserOutput objects for the revision's individual slots, as well as a combined ParserOutput |
| 41 | * of all slots. |
| 42 | * |
| 43 | * @since 1.32 |
| 44 | */ |
| 45 | class RenderedRevision implements SlotRenderingProvider { |
| 46 | |
| 47 | /** @var RevisionRecord */ |
| 48 | private $revision; |
| 49 | |
| 50 | /** |
| 51 | * @var ParserOptions |
| 52 | */ |
| 53 | private $options; |
| 54 | |
| 55 | /** |
| 56 | * @var int Audience to check when accessing content. |
| 57 | */ |
| 58 | private $audience = RevisionRecord::FOR_PUBLIC; |
| 59 | |
| 60 | /** |
| 61 | * @var Authority|null The user to use for audience checks during content access. |
| 62 | */ |
| 63 | private $performer = null; |
| 64 | |
| 65 | /** |
| 66 | * @var ParserOutput|null The combined ParserOutput for the revision, |
| 67 | * initialized lazily by getRevisionParserOutput(). |
| 68 | */ |
| 69 | private $revisionOutput = null; |
| 70 | |
| 71 | /** |
| 72 | * @var ParserOutput[] The ParserOutput for each slot, |
| 73 | * initialized lazily by getSlotParserOutput(). |
| 74 | */ |
| 75 | private $slotsOutput = []; |
| 76 | |
| 77 | /** |
| 78 | * @var callable Callback for combining slot output into revision output. |
| 79 | * Signature: function ( RenderedRevision $this, array $hints ): ParserOutput. |
| 80 | */ |
| 81 | private $combineOutput; |
| 82 | |
| 83 | /** |
| 84 | * @var LoggerInterface For profiling ParserOutput re-use. |
| 85 | */ |
| 86 | private $saveParseLogger; |
| 87 | |
| 88 | /** |
| 89 | * @var ContentRenderer Service to render content. |
| 90 | */ |
| 91 | private $contentRenderer; |
| 92 | |
| 93 | /** |
| 94 | * @note Application logic should not instantiate RenderedRevision instances directly, |
| 95 | * but should use a RevisionRenderer instead. |
| 96 | * |
| 97 | * @param RevisionRecord $revision The revision to render. The content for rendering will be |
| 98 | * taken from this RevisionRecord. However, if the RevisionRecord is not complete |
| 99 | * according isReadyForInsertion(), but a revision ID is known, the parser may load |
| 100 | * the revision from the database if it needs revision meta data to handle magic |
| 101 | * words like {{REVISIONUSER}}. |
| 102 | * @param ParserOptions $options |
| 103 | * @param ContentRenderer $contentRenderer |
| 104 | * @param callable $combineOutput Callback for combining slot output into revision output. |
| 105 | * Signature: function ( RenderedRevision $this, array $hints ): ParserOutput. |
| 106 | * @param int $audience Use RevisionRecord::FOR_PUBLIC, FOR_THIS_USER, or RAW. |
| 107 | * @param Authority|null $performer Required if $audience is FOR_THIS_USER. |
| 108 | */ |
| 109 | public function __construct( |
| 110 | RevisionRecord $revision, |
| 111 | ParserOptions $options, |
| 112 | ContentRenderer $contentRenderer, |
| 113 | callable $combineOutput, |
| 114 | $audience = RevisionRecord::FOR_PUBLIC, |
| 115 | ?Authority $performer = null |
| 116 | ) { |
| 117 | $this->options = $options; |
| 118 | |
| 119 | $this->setRevisionInternal( $revision ); |
| 120 | |
| 121 | $this->contentRenderer = $contentRenderer; |
| 122 | $this->combineOutput = $combineOutput; |
| 123 | $this->saveParseLogger = new NullLogger(); |
| 124 | |
| 125 | if ( $audience === RevisionRecord::FOR_THIS_USER && !$performer ) { |
| 126 | throw new InvalidArgumentException( |
| 127 | 'User must be specified when setting audience to FOR_THIS_USER' |
| 128 | ); |
| 129 | } |
| 130 | |
| 131 | $this->audience = $audience; |
| 132 | $this->performer = $performer; |
| 133 | } |
| 134 | |
| 135 | /** |
| 136 | * @param LoggerInterface $saveParseLogger |
| 137 | */ |
| 138 | public function setSaveParseLogger( LoggerInterface $saveParseLogger ) { |
| 139 | $this->saveParseLogger = $saveParseLogger; |
| 140 | } |
| 141 | |
| 142 | /** |
| 143 | * @return bool Whether the revision's content has been hidden from unprivileged users. |
| 144 | */ |
| 145 | public function isContentDeleted() { |
| 146 | return $this->revision->isDeleted( RevisionRecord::DELETED_TEXT ); |
| 147 | } |
| 148 | |
| 149 | /** |
| 150 | * @return RevisionRecord |
| 151 | */ |
| 152 | public function getRevision() { |
| 153 | return $this->revision; |
| 154 | } |
| 155 | |
| 156 | /** |
| 157 | * @return ParserOptions |
| 158 | */ |
| 159 | public function getOptions() { |
| 160 | return $this->options; |
| 161 | } |
| 162 | |
| 163 | /** |
| 164 | * Sets a ParserOutput to be returned by getRevisionParserOutput(). |
| 165 | * |
| 166 | * @note For internal use by RevisionRenderer only! This method may be modified |
| 167 | * or removed without notice per the deprecation policy. |
| 168 | * |
| 169 | * @internal |
| 170 | * |
| 171 | * @param ParserOutput $output |
| 172 | */ |
| 173 | public function setRevisionParserOutput( ParserOutput $output ) { |
| 174 | $this->revisionOutput = $output; |
| 175 | |
| 176 | // If there is only one slot, we assume that the combined output is identical |
| 177 | // with the main slot's output. This is intended to prevent a redundant re-parse of |
| 178 | // the content in case getSlotParserOutput( SlotRecord::MAIN ) is called, for instance |
| 179 | // from ContentHandler::getSecondaryDataUpdates. |
| 180 | if ( $this->revision->getSlotRoles() === [ SlotRecord::MAIN ] ) { |
| 181 | $this->slotsOutput[ SlotRecord::MAIN ] = $output; |
| 182 | } |
| 183 | } |
| 184 | |
| 185 | /** |
| 186 | * @param array $hints Hints given as an associative array. Known keys: |
| 187 | * - 'generate-html' => bool: Whether the caller is interested in output HTML (as opposed |
| 188 | * to just meta-data). Default is to generate HTML. |
| 189 | * @phan-param array{generate-html?:bool} $hints |
| 190 | * |
| 191 | * @return ParserOutput |
| 192 | */ |
| 193 | public function getRevisionParserOutput( array $hints = [] ) { |
| 194 | $withHtml = $hints['generate-html'] ?? true; |
| 195 | |
| 196 | if ( !$this->revisionOutput |
| 197 | || ( $withHtml && !$this->revisionOutput->hasText() ) |
| 198 | ) { |
| 199 | $output = call_user_func( $this->combineOutput, $this, $hints ); |
| 200 | |
| 201 | Assert::postcondition( |
| 202 | $output instanceof ParserOutput, |
| 203 | 'Callback did not return a ParserOutput object!' |
| 204 | ); |
| 205 | |
| 206 | $this->revisionOutput = $output; |
| 207 | } |
| 208 | |
| 209 | return $this->revisionOutput; |
| 210 | } |
| 211 | |
| 212 | /** |
| 213 | * @param string $role |
| 214 | * @param array $hints Hints given as an associative array. Known keys: |
| 215 | * - 'generate-html' => bool: Whether the caller is interested in output HTML (as opposed |
| 216 | * to just meta-data). Default is to generate HTML. |
| 217 | * - 'previous-output' => ?ParserOutput: An optional "previously parsed" |
| 218 | * version of this slot; used to allow Parsoid selective updates. |
| 219 | * @phan-param array{generate-html?:bool,previous-output?:?ParserOutput} $hints |
| 220 | * |
| 221 | * @throws SuppressedDataException if the content is not accessible for the audience |
| 222 | * specified in the constructor. |
| 223 | * @throws BadRevisionException |
| 224 | * @throws RevisionAccessException |
| 225 | * @return ParserOutput |
| 226 | */ |
| 227 | public function getSlotParserOutput( $role, array $hints = [] ) { |
| 228 | $withHtml = $hints['generate-html'] ?? true; |
| 229 | |
| 230 | if ( !isset( $this->slotsOutput[ $role ] ) |
| 231 | || ( $withHtml && !$this->slotsOutput[ $role ]->hasText() ) |
| 232 | ) { |
| 233 | $content = $this->revision->getContentOrThrow( $role, $this->audience, $this->performer ); |
| 234 | |
| 235 | // XXX: allow SlotRoleHandler to control the ParserOutput? |
| 236 | $output = $this->getSlotParserOutputUncached( $content, $hints ); |
| 237 | |
| 238 | if ( $withHtml && !$output->hasText() ) { |
| 239 | throw new LogicException( |
| 240 | 'HTML generation was requested, but ' |
| 241 | . get_class( $content ) |
| 242 | . ' that passed to ' |
| 243 | . 'ContentRenderer::getParserOutput() returns a ParserOutput with no text set.' |
| 244 | ); |
| 245 | } |
| 246 | |
| 247 | // Detach watcher, to ensure option use is not recorded in the wrong ParserOutput. |
| 248 | $this->options->registerWatcher( null ); |
| 249 | |
| 250 | $this->slotsOutput[ $role ] = $output; |
| 251 | } |
| 252 | |
| 253 | return $this->slotsOutput[$role]; |
| 254 | } |
| 255 | |
| 256 | /** |
| 257 | * @note This method exists to make duplicate parses easier to see during profiling |
| 258 | * @param Content $content |
| 259 | * @param array{generate-html?:bool,previous-output?:?ParserOutput} $hints |
| 260 | * @return ParserOutput |
| 261 | */ |
| 262 | private function getSlotParserOutputUncached( Content $content, array $hints ): ParserOutput { |
| 263 | return $this->contentRenderer->getParserOutput( |
| 264 | $content, |
| 265 | $this->revision->getPage(), |
| 266 | $this->revision, |
| 267 | $this->options, |
| 268 | $hints |
| 269 | ); |
| 270 | } |
| 271 | |
| 272 | /** |
| 273 | * Updates the RevisionRecord after the revision has been saved. This can be used to discard |
| 274 | * and cached ParserOutput so parser functions like {{REVISIONTIMESTAMP}} or {{REVISIONID}} |
| 275 | * are re-evaluated. |
| 276 | * |
| 277 | * @note There should be no need to call this for null-edits. |
| 278 | * |
| 279 | * @param RevisionRecord $rev |
| 280 | */ |
| 281 | public function updateRevision( RevisionRecord $rev ) { |
| 282 | if ( $rev->getId() === $this->revision->getId() ) { |
| 283 | return; |
| 284 | } |
| 285 | |
| 286 | if ( $this->revision->getId() ) { |
| 287 | throw new LogicException( 'RenderedRevision already has a revision with ID ' |
| 288 | . $this->revision->getId() . ', can\'t update to revision with ID ' . $rev->getId() ); |
| 289 | } |
| 290 | |
| 291 | if ( !$this->revision->getSlots()->hasSameContent( $rev->getSlots() ) ) { |
| 292 | throw new LogicException( 'Cannot update to a revision with different content!' ); |
| 293 | } |
| 294 | |
| 295 | $this->setRevisionInternal( $rev ); |
| 296 | |
| 297 | $this->pruneRevisionSensitiveOutput( |
| 298 | $this->revision->getPageId(), |
| 299 | $this->revision->getId(), |
| 300 | $this->revision->getTimestamp() |
| 301 | ); |
| 302 | } |
| 303 | |
| 304 | /** |
| 305 | * Prune any output that depends on the revision ID. |
| 306 | * |
| 307 | * @param int|bool $actualPageId The actual page id, to check the used speculative page ID |
| 308 | * against; false, to not purge on vary-page-id; true, to purge on vary-page-id |
| 309 | * unconditionally. |
| 310 | * @param int|bool $actualRevId The actual rev id, to check the used speculative rev ID |
| 311 | * against,; false, to not purge on vary-revision-id; true, to purge on |
| 312 | * vary-revision-id unconditionally. |
| 313 | * @param string|bool $actualRevTimestamp The actual rev timestamp, to check against the |
| 314 | * parser output revision timestamp; false, to not purge on vary-revision-timestamp; |
| 315 | * true, to purge on vary-revision-timestamp unconditionally. |
| 316 | */ |
| 317 | private function pruneRevisionSensitiveOutput( |
| 318 | $actualPageId, |
| 319 | $actualRevId, |
| 320 | $actualRevTimestamp |
| 321 | ) { |
| 322 | if ( $this->revisionOutput ) { |
| 323 | if ( $this->outputVariesOnRevisionMetaData( |
| 324 | $this->revisionOutput, |
| 325 | $actualPageId, |
| 326 | $actualRevId, |
| 327 | $actualRevTimestamp |
| 328 | ) ) { |
| 329 | $this->revisionOutput = null; |
| 330 | } |
| 331 | } else { |
| 332 | $this->saveParseLogger->debug( __METHOD__ . ": no prepared revision output" ); |
| 333 | } |
| 334 | |
| 335 | foreach ( $this->slotsOutput as $role => $output ) { |
| 336 | if ( $this->outputVariesOnRevisionMetaData( |
| 337 | $output, |
| 338 | $actualPageId, |
| 339 | $actualRevId, |
| 340 | $actualRevTimestamp |
| 341 | ) ) { |
| 342 | unset( $this->slotsOutput[$role] ); |
| 343 | } |
| 344 | } |
| 345 | } |
| 346 | |
| 347 | /** |
| 348 | * @param RevisionRecord $revision |
| 349 | */ |
| 350 | private function setRevisionInternal( RevisionRecord $revision ) { |
| 351 | $this->revision = $revision; |
| 352 | |
| 353 | // Force the parser to use $this->revision to resolve magic words like {{REVISIONUSER}} |
| 354 | // if the revision is either known to be complete, or it doesn't have a revision ID set. |
| 355 | // If it's incomplete and we have a revision ID, the parser can do better by loading |
| 356 | // the revision from the database if needed to handle a magic word. |
| 357 | // |
| 358 | // The following considerations inform the logic described above: |
| 359 | // |
| 360 | // 1) If we have a saved revision already loaded, we want the parser to use it, instead of |
| 361 | // loading it again. |
| 362 | // |
| 363 | // 2) If the revision is a fake that wraps some kind of synthetic content, such as an |
| 364 | // error message from Article, it should be used directly and things like {{REVISIONUSER}} |
| 365 | // should not expected to work, since there may not even be an actual revision to |
| 366 | // refer to. |
| 367 | // |
| 368 | // 3) If the revision is a fake constructed around a page, a Content object, and |
| 369 | // a revision ID, to provide backwards compatibility to code that has access to those |
| 370 | // but not to a complete RevisionRecord for rendering, then we want the Parser to |
| 371 | // load the actual revision from the database when it encounters a magic word like |
| 372 | // {{REVISIONUSER}}, but we don't want to load that revision ahead of time just in case. |
| 373 | // |
| 374 | // 4) Previewing an edit to a template should use the submitted unsaved |
| 375 | // MutableRevisionRecord for self-transclusions in the template's documentation (see T7278). |
| 376 | // That revision would be complete except for the ID field. |
| 377 | // |
| 378 | // 5) Pre-save transform would provide a RevisionRecord that has all meta-data but is |
| 379 | // incomplete due to not yet having content set. However, since it doesn't have a revision |
| 380 | // ID either, the below code would still force it to be used, allowing |
| 381 | // {{subst::REVISIONUSER}} to function as expected. |
| 382 | |
| 383 | if ( $this->revision->isReadyForInsertion() || !$this->revision->getId() ) { |
| 384 | $oldCallback = $this->options->getCurrentRevisionRecordCallback(); |
| 385 | $this->options->setCurrentRevisionRecordCallback( |
| 386 | function ( PageReference $parserPage, $parser = null ) use ( $oldCallback ) { |
| 387 | if ( $this->revision->getPage()->isSamePageAs( $parserPage ) ) { |
| 388 | return $this->revision; |
| 389 | } else { |
| 390 | return call_user_func( $oldCallback, $parserPage, $parser ); |
| 391 | } |
| 392 | } |
| 393 | ); |
| 394 | } |
| 395 | } |
| 396 | |
| 397 | /** |
| 398 | * @param ParserOutput $parserOutput |
| 399 | * @param int|bool $actualPageId The actual page id, to check the used speculative page ID |
| 400 | * against; false, to not purge on vary-page-id; true, to purge on vary-page-id |
| 401 | * unconditionally. |
| 402 | * @param int|bool $actualRevId The actual rev id, to check the used speculative rev ID |
| 403 | * against,; false, to not purge on vary-revision-id; true, to purge on |
| 404 | * vary-revision-id unconditionally. |
| 405 | * @param string|bool $actualRevTimestamp The actual rev timestamp, to check against the |
| 406 | * parser output revision timestamp; false, to not purge on vary-revision-timestamp; |
| 407 | * true, to purge on vary-revision-timestamp unconditionally. |
| 408 | * @return bool |
| 409 | */ |
| 410 | private function outputVariesOnRevisionMetaData( |
| 411 | ParserOutput $parserOutput, |
| 412 | $actualPageId, |
| 413 | $actualRevId, |
| 414 | $actualRevTimestamp |
| 415 | ) { |
| 416 | $logger = $this->saveParseLogger; |
| 417 | $varyMsg = __METHOD__ . ": cannot use prepared output for '{title}'"; |
| 418 | $context = [ 'title' => (string)$this->revision->getPage() ]; |
| 419 | |
| 420 | if ( $parserOutput->getOutputFlag( ParserOutputFlags::VARY_REVISION ) ) { |
| 421 | // If {{PAGEID}} resolved to 0, then that word need to resolve to the actual page ID |
| 422 | $logger->info( "$varyMsg (vary-revision)", $context ); |
| 423 | return true; |
| 424 | } elseif ( |
| 425 | $parserOutput->getOutputFlag( ParserOutputFlags::VARY_REVISION_ID ) |
| 426 | && $actualRevId !== false |
| 427 | && ( $actualRevId === true || $parserOutput->getSpeculativeRevIdUsed() !== $actualRevId ) |
| 428 | ) { |
| 429 | $logger->info( "$varyMsg (vary-revision-id and wrong ID)", $context ); |
| 430 | return true; |
| 431 | } elseif ( |
| 432 | $parserOutput->getOutputFlag( ParserOutputFlags::VARY_REVISION_TIMESTAMP ) |
| 433 | && $actualRevTimestamp !== false |
| 434 | && ( $actualRevTimestamp === true || |
| 435 | $parserOutput->getRevisionTimestampUsed() !== $actualRevTimestamp ) |
| 436 | ) { |
| 437 | $logger->info( "$varyMsg (vary-revision-timestamp and wrong timestamp)", $context ); |
| 438 | return true; |
| 439 | } elseif ( |
| 440 | $parserOutput->getOutputFlag( ParserOutputFlags::VARY_PAGE_ID ) |
| 441 | && $actualPageId !== false |
| 442 | && ( $actualPageId === true || $parserOutput->getSpeculativePageIdUsed() !== $actualPageId ) |
| 443 | ) { |
| 444 | $logger->info( "$varyMsg (vary-page-id and wrong ID)", $context ); |
| 445 | return true; |
| 446 | } elseif ( $parserOutput->getOutputFlag( ParserOutputFlags::VARY_REVISION_EXISTS ) ) { |
| 447 | // If {{REVISIONID}} resolved to '', it now needs to resolve to '-'. |
| 448 | // Note that edit stashing always uses '-', which can be used for both |
| 449 | // edit filter checks and canonical parser cache. |
| 450 | $logger->info( "$varyMsg (vary-revision-exists)", $context ); |
| 451 | return true; |
| 452 | } elseif ( |
| 453 | $parserOutput->getOutputFlag( ParserOutputFlags::VARY_REVISION_SHA1 ) && |
| 454 | $parserOutput->getRevisionUsedSha1Base36() !== $this->revision->getSha1() |
| 455 | ) { |
| 456 | // If a self-transclusion used the proposed page text, it must match the final |
| 457 | // page content after PST transformations and automatically merged edit conflicts |
| 458 | $logger->info( "$varyMsg (vary-revision-sha1 with wrong SHA-1)", $context ); |
| 459 | return true; |
| 460 | } |
| 461 | |
| 462 | // NOTE: In the original fix for T135261, the output was discarded if ParserOutputFlags::VARY_USER was |
| 463 | // set for a null-edit. The reason was that the original rendering in that case was |
| 464 | // targeting the user making the null-edit, not the user who made the original edit, |
| 465 | // causing {{REVISIONUSER}} to return the wrong name. |
| 466 | // This case is now expected to be handled by the code in RevisionRenderer that |
| 467 | // constructs the ParserOptions: For a null-edit, setCurrentRevisionRecordCallback is |
| 468 | // called with the old, existing revision. |
| 469 | $logger->debug( __METHOD__ . ": reusing prepared output for '{title}'", $context ); |
| 470 | return false; |
| 471 | } |
| 472 | } |