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| 1 | <?php |
| 2 | |
| 3 | namespace MediaWiki\Rest\Handler\Helper; |
| 4 | |
| 5 | use MediaWiki\ChangeTags\ChangeTagsStore; |
| 6 | use MediaWiki\Config\ServiceOptions; |
| 7 | use MediaWiki\Content\TextContent; |
| 8 | use MediaWiki\Content\WikitextContent; |
| 9 | use MediaWiki\MainConfigNames; |
| 10 | use MediaWiki\Message\Message; |
| 11 | use MediaWiki\Page\ExistingPageRecord; |
| 12 | use MediaWiki\Page\PageIdentity; |
| 13 | use MediaWiki\Page\PageLookup; |
| 14 | use MediaWiki\Permissions\Authority; |
| 15 | use MediaWiki\Rest\Handler; |
| 16 | use MediaWiki\Rest\LocalizedHttpException; |
| 17 | use MediaWiki\Rest\ResponseInterface; |
| 18 | use MediaWiki\Revision\MutableRevisionRecord; |
| 19 | use MediaWiki\Revision\RevisionAccessException; |
| 20 | use MediaWiki\Revision\RevisionLookup; |
| 21 | use MediaWiki\Revision\RevisionRecord; |
| 22 | use MediaWiki\Revision\SlotRecord; |
| 23 | use MediaWiki\Revision\SuppressedDataException; |
| 24 | use MediaWiki\Title\Title; |
| 25 | use MediaWiki\Title\TitleFactory; |
| 26 | use MediaWiki\Title\TitleFormatter; |
| 27 | use Wikimedia\Message\MessageValue; |
| 28 | use Wikimedia\ParamValidator\ParamValidator; |
| 29 | use Wikimedia\Rdbms\IConnectionProvider; |
| 30 | |
| 31 | /** |
| 32 | * @internal for use by core REST infrastructure |
| 33 | */ |
| 34 | class PageContentHelper { |
| 35 | |
| 36 | /** |
| 37 | * The maximum cache duration for page content. |
| 38 | * |
| 39 | * If this is set to a value higher than about 60 seconds, active purging |
| 40 | * will have to be employed to make sure clients do not receive overly stale |
| 41 | * content. This is especially important to avoid distributing vandalized |
| 42 | * content for too long. |
| 43 | * |
| 44 | * Active purging can be enabled by adding the relevant URLs to |
| 45 | * HTMLCacheUpdater. See T365630 for more discussion. |
| 46 | */ |
| 47 | private const MAX_AGE_200 = 5; |
| 48 | |
| 49 | /** |
| 50 | * @internal |
| 51 | */ |
| 52 | public const CONSTRUCTOR_OPTIONS = [ |
| 53 | MainConfigNames::RightsUrl, |
| 54 | MainConfigNames::RightsText, |
| 55 | ]; |
| 56 | |
| 57 | protected ServiceOptions $options; |
| 58 | protected RevisionLookup $revisionLookup; |
| 59 | protected TitleFormatter $titleFormatter; |
| 60 | protected PageLookup $pageLookup; |
| 61 | private TitleFactory $titleFactory; |
| 62 | private IConnectionProvider $dbProvider; |
| 63 | private ChangeTagsStore $changeTagsStore; |
| 64 | |
| 65 | /** @var Authority|null */ |
| 66 | protected $authority = null; |
| 67 | |
| 68 | /** @var string[] */ |
| 69 | protected $parameters = null; |
| 70 | |
| 71 | /** @var RevisionRecord|false|null */ |
| 72 | protected $targetRevision = false; |
| 73 | |
| 74 | /** @var ExistingPageRecord|false|null */ |
| 75 | protected $pageRecord = false; |
| 76 | |
| 77 | /** @var PageIdentity|false|null */ |
| 78 | private $pageIdentity = false; |
| 79 | |
| 80 | public function __construct( |
| 81 | ServiceOptions $options, |
| 82 | RevisionLookup $revisionLookup, |
| 83 | TitleFormatter $titleFormatter, |
| 84 | PageLookup $pageLookup, |
| 85 | TitleFactory $titleFactory, |
| 86 | IConnectionProvider $dbProvider, |
| 87 | ChangeTagsStore $changeTagsStore |
| 88 | ) { |
| 89 | $this->options = $options; |
| 90 | $this->revisionLookup = $revisionLookup; |
| 91 | $this->titleFormatter = $titleFormatter; |
| 92 | $this->pageLookup = $pageLookup; |
| 93 | $this->titleFactory = $titleFactory; |
| 94 | $this->dbProvider = $dbProvider; |
| 95 | $this->changeTagsStore = $changeTagsStore; |
| 96 | } |
| 97 | |
| 98 | /** |
| 99 | * @param Authority $authority |
| 100 | * @param string[] $parameters validated parameters |
| 101 | */ |
| 102 | public function init( Authority $authority, array $parameters ) { |
| 103 | $this->authority = $authority; |
| 104 | $this->parameters = $parameters; |
| 105 | } |
| 106 | |
| 107 | /** |
| 108 | * @return string|null title text or null if unable to retrieve title |
| 109 | */ |
| 110 | public function getTitleText(): ?string { |
| 111 | return $this->parameters['title'] ?? null; |
| 112 | } |
| 113 | |
| 114 | public function getPage(): ?ExistingPageRecord { |
| 115 | if ( $this->pageRecord === false ) { |
| 116 | $titleText = $this->getTitleText(); |
| 117 | if ( $titleText === null ) { |
| 118 | return null; |
| 119 | } |
| 120 | $this->pageRecord = $this->pageLookup->getExistingPageByText( $titleText ); |
| 121 | } |
| 122 | return $this->pageRecord; |
| 123 | } |
| 124 | |
| 125 | public function getPageIdentity(): ?PageIdentity { |
| 126 | if ( $this->pageIdentity === false ) { |
| 127 | $this->pageIdentity = $this->getPage(); |
| 128 | } |
| 129 | |
| 130 | if ( $this->pageIdentity === null ) { |
| 131 | $titleText = $this->getTitleText(); |
| 132 | if ( $titleText === null ) { |
| 133 | return null; |
| 134 | } |
| 135 | $this->pageIdentity = $this->pageLookup->getPageByText( $titleText ); |
| 136 | } |
| 137 | |
| 138 | return $this->pageIdentity; |
| 139 | } |
| 140 | |
| 141 | /** |
| 142 | * Returns the target revision. No permission checks are applied. |
| 143 | * |
| 144 | * @return RevisionRecord|null latest revision or null if unable to retrieve revision |
| 145 | */ |
| 146 | public function getTargetRevision(): ?RevisionRecord { |
| 147 | if ( $this->targetRevision === false ) { |
| 148 | $page = $this->getPage(); |
| 149 | if ( $page ) { |
| 150 | $this->targetRevision = $this->revisionLookup->getRevisionByTitle( $page ); |
| 151 | } else { |
| 152 | $this->targetRevision = null; |
| 153 | } |
| 154 | } |
| 155 | return $this->targetRevision; |
| 156 | } |
| 157 | |
| 158 | // Default to main slot |
| 159 | public function getRole(): string { |
| 160 | return SlotRecord::MAIN; |
| 161 | } |
| 162 | |
| 163 | /** |
| 164 | * @return TextContent |
| 165 | * @throws LocalizedHttpException slot content is not TextContent or RevisionRecord/Slot is inaccessible |
| 166 | */ |
| 167 | public function getContent(): TextContent { |
| 168 | $revision = $this->getTargetRevision(); |
| 169 | |
| 170 | if ( !$revision ) { |
| 171 | $titleText = $this->getTitleText() ?? ''; |
| 172 | throw new LocalizedHttpException( |
| 173 | MessageValue::new( 'rest-no-revision' )->plaintextParams( $titleText ), |
| 174 | 404 |
| 175 | ); |
| 176 | } |
| 177 | |
| 178 | $slotRole = $this->getRole(); |
| 179 | |
| 180 | try { |
| 181 | $content = $revision |
| 182 | ->getSlot( $slotRole, RevisionRecord::FOR_THIS_USER, $this->authority ) |
| 183 | ->getContent() |
| 184 | ->convert( CONTENT_MODEL_TEXT ); |
| 185 | if ( !( $content instanceof TextContent ) ) { |
| 186 | throw new LocalizedHttpException( MessageValue::new( 'rest-page-source-type-error' ), 400 ); |
| 187 | } |
| 188 | } catch ( SuppressedDataException $e ) { |
| 189 | throw new LocalizedHttpException( |
| 190 | MessageValue::new( 'rest-permission-denied-revision' )->numParams( $revision->getId() ), |
| 191 | 403 |
| 192 | ); |
| 193 | } catch ( RevisionAccessException $e ) { |
| 194 | throw new LocalizedHttpException( |
| 195 | MessageValue::new( 'rest-nonexistent-revision' )->numParams( $revision->getId() ), |
| 196 | 404 |
| 197 | ); |
| 198 | } |
| 199 | return $content; |
| 200 | } |
| 201 | |
| 202 | public function isAccessible(): bool { |
| 203 | $page = $this->getPageIdentity(); |
| 204 | return $page && $this->authority->probablyCan( 'read', $page ); |
| 205 | } |
| 206 | |
| 207 | /** |
| 208 | * Returns an ETag representing a page's source. The ETag assumes a page's source has changed |
| 209 | * if the latest revision of a page has been made private, un-readable for another reason, |
| 210 | * or a newer revision exists. |
| 211 | * @return string|null |
| 212 | */ |
| 213 | public function getETag(): ?string { |
| 214 | $revision = $this->getTargetRevision(); |
| 215 | $revId = $revision ? $revision->getId() : 'e0'; |
| 216 | |
| 217 | $isAccessible = $this->isAccessible(); |
| 218 | $accessibleTag = $isAccessible ? 'a1' : 'a0'; |
| 219 | |
| 220 | $revisionTag = $revId . $accessibleTag; |
| 221 | return '"' . sha1( $revisionTag ) . '"'; |
| 222 | } |
| 223 | |
| 224 | public function getLastModified(): ?string { |
| 225 | if ( !$this->isAccessible() ) { |
| 226 | return null; |
| 227 | } |
| 228 | |
| 229 | $revision = $this->getTargetRevision(); |
| 230 | if ( $revision ) { |
| 231 | return $revision->getTimestamp(); |
| 232 | } |
| 233 | return null; |
| 234 | } |
| 235 | |
| 236 | /** |
| 237 | * Checks whether content exists. Permission checks are not considered. |
| 238 | */ |
| 239 | public function hasContent(): bool { |
| 240 | return $this->useDefaultSystemMessage() || (bool)$this->getPage(); |
| 241 | } |
| 242 | |
| 243 | public function constructMetadata(): array { |
| 244 | $revision = $this->getRevisionRecordForMetadata(); |
| 245 | |
| 246 | $page = $revision->getPage(); |
| 247 | return [ |
| 248 | 'id' => $page->getId(), |
| 249 | 'key' => $this->titleFormatter->getPrefixedDBkey( $page ), |
| 250 | 'title' => $this->titleFormatter->getPrefixedText( $page ), |
| 251 | 'latest' => [ |
| 252 | 'id' => $revision->getId(), |
| 253 | 'timestamp' => wfTimestampOrNull( TS_ISO_8601, $revision->getTimestamp() ) |
| 254 | ], |
| 255 | 'content_model' => $revision->getMainContentModel(), |
| 256 | 'license' => [ |
| 257 | 'url' => $this->options->get( MainConfigNames::RightsUrl ), |
| 258 | 'title' => $this->options->get( MainConfigNames::RightsText ) |
| 259 | ], |
| 260 | ]; |
| 261 | } |
| 262 | |
| 263 | public function constructRestbaseCompatibleMetadata(): array { |
| 264 | $revision = $this->getRevisionRecordForMetadata(); |
| 265 | |
| 266 | $page = $revision->getPage(); |
| 267 | $title = $this->titleFactory->newFromPageIdentity( $page ); |
| 268 | |
| 269 | $tags = $this->changeTagsStore->getTags( |
| 270 | $this->dbProvider->getReplicaDatabase(), |
| 271 | null, $revision->getId(), null |
| 272 | ); |
| 273 | |
| 274 | $restrictions = []; |
| 275 | |
| 276 | if ( $revision->isDeleted( RevisionRecord::DELETED_COMMENT ) ) { |
| 277 | $restrictions[] = 'commenthidden'; |
| 278 | } |
| 279 | |
| 280 | if ( $revision->isDeleted( RevisionRecord::DELETED_USER ) ) { |
| 281 | $restrictions[] = 'userhidden'; |
| 282 | } |
| 283 | |
| 284 | $publicUser = $revision->getUser(); |
| 285 | $publicComment = $revision->getComment(); |
| 286 | |
| 287 | return [ |
| 288 | 'title' => $title->getPrefixedDBkey(), |
| 289 | 'page_id' => $page->getId(), |
| 290 | 'rev' => $revision->getId(), |
| 291 | |
| 292 | // We could look up the tid from a ParserOutput, but it's expensive, |
| 293 | // and the tid can't be used for anything anymore anyway. |
| 294 | // Don't use an empty string though, that may break routing when the |
| 295 | // value is used as a path parameter. |
| 296 | 'tid' => 'DUMMY', |
| 297 | |
| 298 | 'namespace' => $page->getNamespace(), |
| 299 | 'user_id' => $revision->getUser( RevisionRecord::RAW )->getId(), |
| 300 | 'user_text' => $publicUser ? $publicUser->getName() : null, |
| 301 | 'comment' => $publicComment ? $publicComment->text : null, |
| 302 | 'timestamp' => wfTimestampOrNull( TS_ISO_8601, $revision->getTimestamp() ), |
| 303 | 'tags' => $tags, |
| 304 | 'restrictions' => $restrictions, |
| 305 | 'page_language' => $title->getPageLanguage()->getCode(), |
| 306 | 'redirect' => $title->isRedirect() |
| 307 | ]; |
| 308 | } |
| 309 | |
| 310 | /** |
| 311 | * @return array[] |
| 312 | */ |
| 313 | public function getParamSettings(): array { |
| 314 | return [ |
| 315 | 'title' => [ |
| 316 | Handler::PARAM_SOURCE => 'path', |
| 317 | ParamValidator::PARAM_TYPE => 'string', |
| 318 | ParamValidator::PARAM_REQUIRED => true, |
| 319 | Handler::PARAM_DESCRIPTION => new MessageValue( 'rest-param-desc-page-content-title' ), |
| 320 | ], |
| 321 | 'redirect' => [ |
| 322 | Handler::PARAM_SOURCE => 'query', |
| 323 | ParamValidator::PARAM_TYPE => 'boolean', |
| 324 | ParamValidator::PARAM_REQUIRED => false, |
| 325 | ParamValidator::PARAM_DEFAULT => true, |
| 326 | Handler::PARAM_DESCRIPTION => new MessageValue( 'rest-param-desc-page-content-redirect' ), |
| 327 | ] |
| 328 | ]; |
| 329 | } |
| 330 | |
| 331 | /** |
| 332 | * Whether the handler is allowed to follow redirects, according to the |
| 333 | * request parameters. |
| 334 | * |
| 335 | * Handlers that can follow wiki redirects can use this to give clients |
| 336 | * control over the redirect handling behavior. |
| 337 | */ |
| 338 | public function getRedirectsAllowed(): bool { |
| 339 | return $this->parameters['redirect'] ?? true; |
| 340 | } |
| 341 | |
| 342 | /** |
| 343 | * Sets the 'Cache-Control' header no more then provided $expiry. |
| 344 | * @param ResponseInterface $response |
| 345 | * @param int|null $expiry |
| 346 | */ |
| 347 | public function setCacheControl( ResponseInterface $response, ?int $expiry = null ) { |
| 348 | if ( $expiry === null ) { |
| 349 | $maxAge = self::MAX_AGE_200; |
| 350 | } else { |
| 351 | $maxAge = min( self::MAX_AGE_200, $expiry ); |
| 352 | } |
| 353 | $response->setHeader( |
| 354 | 'Cache-Control', |
| 355 | 'max-age=' . $maxAge |
| 356 | ); |
| 357 | } |
| 358 | |
| 359 | /** |
| 360 | * If the page is a system message page. When the content gets |
| 361 | * overridden to create an actual page, this method returns false. |
| 362 | */ |
| 363 | public function useDefaultSystemMessage(): bool { |
| 364 | return $this->getDefaultSystemMessage() !== null && $this->getPage() === null; |
| 365 | } |
| 366 | |
| 367 | public function getDefaultSystemMessage(): ?Message { |
| 368 | $title = Title::newFromText( $this->getTitleText() ); |
| 369 | |
| 370 | return $title ? $title->getDefaultSystemMessage() : null; |
| 371 | } |
| 372 | |
| 373 | /** |
| 374 | * @throws LocalizedHttpException if access is not allowed |
| 375 | */ |
| 376 | public function checkAccessPermission() { |
| 377 | $titleText = $this->getTitleText() ?? ''; |
| 378 | |
| 379 | // @phan-suppress-next-line PhanTypeMismatchArgumentNullable Validated by hasContent |
| 380 | if ( !$this->isAccessible() || !$this->authority->authorizeRead( 'read', $this->getPageIdentity() ) ) { |
| 381 | throw new LocalizedHttpException( |
| 382 | MessageValue::new( 'rest-permission-denied-title' )->plaintextParams( $titleText ), |
| 383 | 403 |
| 384 | ); |
| 385 | } |
| 386 | } |
| 387 | |
| 388 | /** |
| 389 | * @throws LocalizedHttpException if no content is available |
| 390 | */ |
| 391 | public function checkHasContent() { |
| 392 | $titleText = $this->getTitleText() ?? ''; |
| 393 | |
| 394 | $page = $this->getPageIdentity(); |
| 395 | if ( !$page ) { |
| 396 | throw new LocalizedHttpException( |
| 397 | MessageValue::new( 'rest-invalid-title' )->plaintextParams( $titleText ), |
| 398 | 404 |
| 399 | ); |
| 400 | } |
| 401 | |
| 402 | if ( !$this->hasContent() ) { |
| 403 | // needs to check if it's possibly a variant title |
| 404 | throw new LocalizedHttpException( |
| 405 | MessageValue::new( 'rest-nonexistent-title' )->plaintextParams( $titleText ), |
| 406 | 404 |
| 407 | ); |
| 408 | } |
| 409 | |
| 410 | $revision = $this->getTargetRevision(); |
| 411 | if ( !$revision && !$this->useDefaultSystemMessage() ) { |
| 412 | throw new LocalizedHttpException( |
| 413 | MessageValue::new( 'rest-no-revision' )->plaintextParams( $titleText ), |
| 414 | 404 |
| 415 | ); |
| 416 | } |
| 417 | } |
| 418 | |
| 419 | /** |
| 420 | * @throws LocalizedHttpException if the content is not accessible |
| 421 | */ |
| 422 | public function checkAccess() { |
| 423 | $this->checkHasContent(); // Status 404: Not Found |
| 424 | $this->checkAccessPermission(); // Status 403: Forbidden |
| 425 | } |
| 426 | |
| 427 | /** |
| 428 | * @return MutableRevisionRecord|RevisionRecord|null |
| 429 | */ |
| 430 | private function getRevisionRecordForMetadata() { |
| 431 | if ( $this->useDefaultSystemMessage() ) { |
| 432 | $title = Title::newFromText( $this->getTitleText() ); |
| 433 | $content = new WikitextContent( $title->getDefaultMessageText() ); |
| 434 | $revision = new MutableRevisionRecord( $title ); |
| 435 | $revision->setPageId( 0 ); |
| 436 | $revision->setId( 0 ); |
| 437 | $revision->setContent( |
| 438 | SlotRecord::MAIN, |
| 439 | $content |
| 440 | ); |
| 441 | } else { |
| 442 | $revision = $this->getTargetRevision(); |
| 443 | } |
| 444 | |
| 445 | return $revision; |
| 446 | } |
| 447 | |
| 448 | } |