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| 1 | <?php |
| 2 | /** |
| 3 | * This program is free software; you can redistribute it and/or modify |
| 4 | * it under the terms of the GNU General Public License as published by |
| 5 | * the Free Software Foundation; either version 2 of the License, or |
| 6 | * (at your option) any later version. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | * GNU General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License along |
| 14 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 16 | * http://www.gnu.org/copyleft/gpl.html |
| 17 | * |
| 18 | * @file |
| 19 | * @author Andrew Otto <otto@wikimedia.org> |
| 20 | */ |
| 21 | |
| 22 | namespace MediaWiki\Extension\EventBus\Serializers\MediaWiki; |
| 23 | |
| 24 | use MediaWiki\Extension\EventBus\Redirects\RedirectTarget; |
| 25 | use MediaWiki\Extension\EventBus\Serializers\EventSerializer; |
| 26 | use MediaWiki\Linker\LinkTarget; |
| 27 | use MediaWiki\Page\ProperPageIdentity; |
| 28 | use MediaWiki\Revision\RevisionRecord; |
| 29 | use MediaWiki\User\User; |
| 30 | use MediaWiki\WikiMap\WikiMap; |
| 31 | use Wikimedia\Assert\Assert; |
| 32 | |
| 33 | /** |
| 34 | * Methods to convert from incoming page state changes (via Hooks) |
| 35 | * to a mediawiki/page/change event. |
| 36 | */ |
| 37 | class PageChangeEventSerializer { |
| 38 | |
| 39 | /** |
| 40 | * All page change events will have their $schema URI set to this. |
| 41 | * https://phabricator.wikimedia.org/T308017 |
| 42 | */ |
| 43 | public const PAGE_CHANGE_SCHEMA_URI = '/mediawiki/page/change/1.3.0'; |
| 44 | |
| 45 | /** |
| 46 | * There are many kinds of changes that can happen to a MediaWiki pages, |
| 47 | * but only a few kinds of changes in a 'changelog' stream. |
| 48 | * This maps from a MediaWiki page change kind to a changelog kind. |
| 49 | */ |
| 50 | private const PAGE_CHANGE_KIND_TO_CHANGELOG_KIND_MAP = [ |
| 51 | 'create' => 'insert', |
| 52 | 'edit' => 'update', |
| 53 | 'move' => 'update', |
| 54 | 'visibility_change' => 'update', |
| 55 | 'delete' => 'delete', |
| 56 | 'undelete' => 'insert', |
| 57 | ]; |
| 58 | |
| 59 | /** |
| 60 | * @var EventSerializer |
| 61 | */ |
| 62 | private EventSerializer $eventSerializer; |
| 63 | |
| 64 | /** |
| 65 | * @var PageEntitySerializer |
| 66 | */ |
| 67 | private PageEntitySerializer $pageEntitySerializer; |
| 68 | |
| 69 | /** |
| 70 | * @var UserEntitySerializer |
| 71 | */ |
| 72 | private UserEntitySerializer $userEntitySerializer; |
| 73 | |
| 74 | /** |
| 75 | * @var RevisionEntitySerializer |
| 76 | */ |
| 77 | private RevisionEntitySerializer $revisionEntitySerializer; |
| 78 | |
| 79 | /** |
| 80 | * @param EventSerializer $eventSerializer |
| 81 | * @param PageEntitySerializer $pageEntitySerializer |
| 82 | * @param UserEntitySerializer $userEntitySerializer |
| 83 | * @param RevisionEntitySerializer $revisionEntitySerializer |
| 84 | */ |
| 85 | public function __construct( |
| 86 | EventSerializer $eventSerializer, |
| 87 | PageEntitySerializer $pageEntitySerializer, |
| 88 | UserEntitySerializer $userEntitySerializer, |
| 89 | RevisionEntitySerializer $revisionEntitySerializer |
| 90 | ) { |
| 91 | $this->eventSerializer = $eventSerializer; |
| 92 | $this->pageEntitySerializer = $pageEntitySerializer; |
| 93 | $this->userEntitySerializer = $userEntitySerializer; |
| 94 | $this->revisionEntitySerializer = $revisionEntitySerializer; |
| 95 | } |
| 96 | |
| 97 | /** |
| 98 | * Uses EventSerializer to create the mediawiki/page/change event for the given $eventAttrs |
| 99 | * @param string $stream |
| 100 | * @param ProperPageIdentity $page |
| 101 | * @param array $eventAttrs |
| 102 | * @return array |
| 103 | */ |
| 104 | private function toEvent( |
| 105 | string $stream, |
| 106 | ProperPageIdentity $page, |
| 107 | array $eventAttrs |
| 108 | ): array { |
| 109 | // NOTE: It would be better if wiki domain name was fetched and passed into createEvent, |
| 110 | // rather than forcing EventSerializer->createEvent to look up the domain itself. |
| 111 | // However, this would require changing the createEvent method signature, which is used |
| 112 | // by CirrusSearch extension. |
| 113 | // See: https://phabricator.wikimedia.org/T392516 |
| 114 | return $this->eventSerializer->createEvent( |
| 115 | self::PAGE_CHANGE_SCHEMA_URI, |
| 116 | $stream, |
| 117 | $this->pageEntitySerializer->canonicalPageURL( $page ), |
| 118 | $eventAttrs, |
| 119 | self::getWikiId( $page ) |
| 120 | ); |
| 121 | } |
| 122 | |
| 123 | /** |
| 124 | * Returns the appropriate changelog kind given a pageChangeKind. |
| 125 | * @param string $pageChangeKind |
| 126 | * @return string |
| 127 | */ |
| 128 | private static function getChangelogKind( string $pageChangeKind ): string { |
| 129 | Assert::parameter( |
| 130 | array_key_exists( $pageChangeKind, self::PAGE_CHANGE_KIND_TO_CHANGELOG_KIND_MAP ), |
| 131 | '$pageChangeKind', |
| 132 | "Unsupported pageChangeKind '$pageChangeKind'. Must be one of " . |
| 133 | implode( ',', array_keys( self::PAGE_CHANGE_KIND_TO_CHANGELOG_KIND_MAP ) ) |
| 134 | ); |
| 135 | |
| 136 | return self::PAGE_CHANGE_KIND_TO_CHANGELOG_KIND_MAP[$pageChangeKind]; |
| 137 | } |
| 138 | |
| 139 | /** |
| 140 | * Return the page's wikiId, or if that returns false, |
| 141 | * return WikiMap::getCurrentWikiId. |
| 142 | * |
| 143 | * @param ProperPageIdentity $page |
| 144 | * @return string |
| 145 | */ |
| 146 | private static function getWikiId( ProperPageIdentity $page ): string { |
| 147 | // Get the wikiId. page's getWikiId can return false. |
| 148 | // Fallback to global WikiMap. |
| 149 | return $page->getWikiId() ?: WikiMap::getCurrentWikiId(); |
| 150 | } |
| 151 | |
| 152 | /** |
| 153 | * DRY helper to set event fields common to all page change events. |
| 154 | * @param string $page_change_kind |
| 155 | * @param string $dt |
| 156 | * @param ProperPageIdentity $page |
| 157 | * @param User|null $performer |
| 158 | * @param RevisionRecord|null $currentRevision |
| 159 | * @param RedirectTarget|null $redirectTarget |
| 160 | * @param string|null $comment |
| 161 | * @return array |
| 162 | */ |
| 163 | private function toCommonAttrs( |
| 164 | string $page_change_kind, |
| 165 | string $dt, |
| 166 | ProperPageIdentity $page, |
| 167 | ?User $performer, |
| 168 | ?RevisionRecord $currentRevision = null, |
| 169 | ?RedirectTarget $redirectTarget = null, |
| 170 | ?string $comment = null |
| 171 | ): array { |
| 172 | $eventAttrs = [ |
| 173 | 'changelog_kind' => self::getChangelogKind( $page_change_kind ), |
| 174 | 'page_change_kind' => $page_change_kind, |
| 175 | 'dt' => $dt, |
| 176 | 'wiki_id' => self::getWikiId( $page ), |
| 177 | 'page' => $this->pageEntitySerializer->toArray( $page, $redirectTarget ), |
| 178 | ]; |
| 179 | |
| 180 | if ( $performer !== null ) { |
| 181 | $eventAttrs['performer'] = $this->userEntitySerializer->toArray( $performer ); |
| 182 | } |
| 183 | |
| 184 | if ( $comment !== null ) { |
| 185 | $eventAttrs['comment'] = $comment; |
| 186 | } |
| 187 | |
| 188 | if ( $currentRevision !== null ) { |
| 189 | $eventAttrs['revision'] = $this->revisionEntitySerializer->toArray( $currentRevision ); |
| 190 | } |
| 191 | |
| 192 | return $eventAttrs; |
| 193 | } |
| 194 | |
| 195 | /** |
| 196 | * Converts from the given page and RevisionRecord to a page_change_kind: create event. |
| 197 | * |
| 198 | * @param string $stream |
| 199 | * @param ProperPageIdentity $page |
| 200 | * @param User $performer |
| 201 | * @param RevisionRecord $currentRevision |
| 202 | * @param RedirectTarget|null $redirectTarget |
| 203 | * @return array |
| 204 | */ |
| 205 | public function toCreateEvent( |
| 206 | string $stream, |
| 207 | ProperPageIdentity $page, |
| 208 | User $performer, |
| 209 | RevisionRecord $currentRevision, |
| 210 | ?RedirectTarget $redirectTarget = null |
| 211 | ): array { |
| 212 | $eventAttrs = $this->toCommonAttrs( |
| 213 | 'create', |
| 214 | $this->eventSerializer->timestampToDt( $currentRevision->getTimestamp() ), |
| 215 | $page, |
| 216 | $performer, |
| 217 | $currentRevision, |
| 218 | $redirectTarget, |
| 219 | null |
| 220 | ); |
| 221 | |
| 222 | return $this->toEvent( $stream, $page, $eventAttrs ); |
| 223 | } |
| 224 | |
| 225 | /** |
| 226 | * Converts from the given page and RevisionRecord to a page_change_kind: edit event. |
| 227 | * |
| 228 | * @param string $stream |
| 229 | * @param ProperPageIdentity $page |
| 230 | * @param User $performer |
| 231 | * @param RevisionRecord $currentRevision |
| 232 | * @param RedirectTarget|null $redirectTarget |
| 233 | * @param RevisionRecord|null $parentRevision |
| 234 | * @return array |
| 235 | */ |
| 236 | public function toEditEvent( |
| 237 | string $stream, |
| 238 | ProperPageIdentity $page, |
| 239 | User $performer, |
| 240 | RevisionRecord $currentRevision, |
| 241 | ?RedirectTarget $redirectTarget = null, |
| 242 | ?RevisionRecord $parentRevision = null |
| 243 | ): array { |
| 244 | $eventAttrs = $this->toCommonAttrs( |
| 245 | 'edit', |
| 246 | $this->eventSerializer->timestampToDt( $currentRevision->getTimestamp() ), |
| 247 | $page, |
| 248 | $performer, |
| 249 | $currentRevision, |
| 250 | $redirectTarget, |
| 251 | null |
| 252 | ); |
| 253 | |
| 254 | // On edit, the prior state is all about the previous revision. |
| 255 | if ( $parentRevision !== null ) { |
| 256 | $priorStateAttrs = []; |
| 257 | $priorStateAttrs['revision'] = $this->revisionEntitySerializer->toArray( $parentRevision ); |
| 258 | $eventAttrs['prior_state'] = $priorStateAttrs; |
| 259 | } |
| 260 | |
| 261 | return $this->toEvent( $stream, $page, $eventAttrs ); |
| 262 | } |
| 263 | |
| 264 | /** |
| 265 | * Converts from the given page, RevisionRecord |
| 266 | * and old title LinkTarget to a page_change_kind: move event. |
| 267 | * |
| 268 | * @param string $stream |
| 269 | * @param ProperPageIdentity $page |
| 270 | * @param User $performer |
| 271 | * @param RevisionRecord $currentRevision |
| 272 | * @param RevisionRecord $parentRevision |
| 273 | * @param LinkTarget|ProperPageIdentity $oldTitle |
| 274 | * @param string $reason |
| 275 | * @param ProperPageIdentity|null $createdRedirectWikiPage |
| 276 | * @param RedirectTarget|null $redirectTarget |
| 277 | * @return array |
| 278 | */ |
| 279 | public function toMoveEvent( |
| 280 | string $stream, |
| 281 | ProperPageIdentity $page, |
| 282 | User $performer, |
| 283 | RevisionRecord $currentRevision, |
| 284 | RevisionRecord $parentRevision, |
| 285 | /* LinkTarget|ProperPageIdentity */ $oldTitle, |
| 286 | string $reason, |
| 287 | ?ProperPageIdentity $createdRedirectWikiPage = null, |
| 288 | ?RedirectTarget $redirectTarget = null |
| 289 | ): array { |
| 290 | $eventAttrs = $this->toCommonAttrs( |
| 291 | 'move', |
| 292 | // NOTE: This uses the newly created revision's timestamp as the page move event time, |
| 293 | // for lack of a better 'move time'. |
| 294 | $this->eventSerializer->timestampToDt( $currentRevision->getTimestamp() ), |
| 295 | $page, |
| 296 | $performer, |
| 297 | $currentRevision, |
| 298 | $redirectTarget, |
| 299 | // NOTE: the reason for the page move is used to generate the comment |
| 300 | // on the revision created by the page move, but it is not the same! |
| 301 | $reason |
| 302 | ); |
| 303 | |
| 304 | // If a new redirect page was created during this move, then include |
| 305 | // some information about it. |
| 306 | if ( $createdRedirectWikiPage ) { |
| 307 | $eventAttrs['created_redirect_page'] = $this->pageEntitySerializer->toArray( $createdRedirectWikiPage ); |
| 308 | } |
| 309 | |
| 310 | // On move, the prior state is about page title, namespace, and also the previous revision. |
| 311 | // (Page moves create a new revision of a page). |
| 312 | $priorStateAttrs = []; |
| 313 | |
| 314 | // Include old page_title and namespace to prior_state, these are primary |
| 315 | // arguments to the move. Skip page_id as it could not have changed. |
| 316 | $priorStateAttrs['page'] = [ |
| 317 | 'page_title' => $this->pageEntitySerializer->formatLinkTarget( $oldTitle ), |
| 318 | 'namespace_id' => $oldTitle->getNamespace(), |
| 319 | ]; |
| 320 | |
| 321 | // add parent revision info in prior_state, since a page move creates a new revision. |
| 322 | $priorStateAttrs['revision'] = $this->revisionEntitySerializer->toArray( $parentRevision ); |
| 323 | |
| 324 | $eventAttrs['prior_state'] = $priorStateAttrs; |
| 325 | |
| 326 | return $this->toEvent( $stream, $page, $eventAttrs ); |
| 327 | } |
| 328 | |
| 329 | /** |
| 330 | * Converts from the given page, RevisionRecord to a page_change_kind: delete event. |
| 331 | * |
| 332 | * NOTE: If $isSuppression is true, the current revision info emitted by this even will have |
| 333 | * all of its visibility settings set to false. |
| 334 | * A consumer of this event probably doesn't care, because they should delete the page |
| 335 | * and revision in response to this event anyway. |
| 336 | * |
| 337 | * @param string $stream |
| 338 | * @param ProperPageIdentity $page |
| 339 | * @param User|null $performer |
| 340 | * @param RevisionRecord $currentRevision |
| 341 | * @param string $reason |
| 342 | * @param string|null $eventTimestamp |
| 343 | * @param int|null $archivedRevisionCount |
| 344 | * @param RedirectTarget|null $redirectTarget |
| 345 | * @param bool $isSuppression |
| 346 | * If true, the current revision info emitted by this even will have |
| 347 | * all of its visibility settings set to false. |
| 348 | * A consumer of this event probably doesn't care, because they should delete the page |
| 349 | * and revision in response to this event anyway. |
| 350 | * @return array |
| 351 | */ |
| 352 | public function toDeleteEvent( |
| 353 | string $stream, |
| 354 | ProperPageIdentity $page, |
| 355 | ?User $performer, |
| 356 | RevisionRecord $currentRevision, |
| 357 | string $reason, |
| 358 | ?string $eventTimestamp = null, |
| 359 | ?int $archivedRevisionCount = null, |
| 360 | ?RedirectTarget $redirectTarget = null, |
| 361 | bool $isSuppression = false |
| 362 | ): array { |
| 363 | $eventAttrs = $this->toCommonAttrs( |
| 364 | 'delete', |
| 365 | $this->eventSerializer->timestampToDt( $eventTimestamp ), |
| 366 | $page, |
| 367 | $performer, |
| 368 | $currentRevision, |
| 369 | $redirectTarget, |
| 370 | $reason |
| 371 | ); |
| 372 | |
| 373 | // page delete specific fields: |
| 374 | if ( $archivedRevisionCount !== null ) { |
| 375 | $eventAttrs['page']['revision_count'] = $archivedRevisionCount; |
| 376 | } |
| 377 | |
| 378 | // If this is a full page suppression, then we need to represent that fact that |
| 379 | // the current revision (and also all revisions of this page) is having its visibility changed |
| 380 | // to fully hidden, AKA SUPPRESSED_ALL, and delete any fields that might contain information |
| 381 | // that has been suppressed. |
| 382 | // NOTE: It would be better if $currentRevision itself had its visibility settings |
| 383 | // set to the same as the 'deleted/archived' revision, but it is not because |
| 384 | // MediaWiki is pretty weird with archived revisions. |
| 385 | // See: https://phabricator.wikimedia.org/T308017#8339347 |
| 386 | if ( $isSuppression ) { |
| 387 | $eventAttrs['revision'] = array_merge( |
| 388 | $eventAttrs['revision'], |
| 389 | $this->revisionEntitySerializer->bitsToVisibilityAttrs( RevisionRecord::SUPPRESSED_ALL ) |
| 390 | ); |
| 391 | |
| 392 | unset( $eventAttrs['revision']['rev_size'] ); |
| 393 | unset( $eventAttrs['revision']['rev_sha1'] ); |
| 394 | unset( $eventAttrs['revision']['comment'] ); |
| 395 | unset( $eventAttrs['revision']['editor'] ); |
| 396 | unset( $eventAttrs['revision']['content_slots'] ); |
| 397 | |
| 398 | // $currentRevision actually has the prior revision visibility info in the case of page suppression. |
| 399 | $eventAttrs['prior_state']['revision'] = $this->revisionEntitySerializer->bitsToVisibilityAttrs( |
| 400 | $currentRevision->getVisibility() |
| 401 | ); |
| 402 | } |
| 403 | |
| 404 | return $this->toEvent( $stream, $page, $eventAttrs ); |
| 405 | } |
| 406 | |
| 407 | /** |
| 408 | * Converts from the given page, RevisionRecord to a page_change_kind: undelete event. |
| 409 | * |
| 410 | * @param string $stream |
| 411 | * @param ProperPageIdentity $page |
| 412 | * @param User $performer |
| 413 | * @param RevisionRecord $currentRevision |
| 414 | * @param string $reason |
| 415 | * @param RedirectTarget|null $redirectTarget |
| 416 | * @param string|null $eventTimestamp |
| 417 | * @param int|null $oldPageID |
| 418 | * @return array |
| 419 | */ |
| 420 | public function toUndeleteEvent( |
| 421 | string $stream, |
| 422 | ProperPageIdentity $page, |
| 423 | User $performer, |
| 424 | RevisionRecord $currentRevision, |
| 425 | string $reason, |
| 426 | ?RedirectTarget $redirectTarget = null, |
| 427 | ?string $eventTimestamp = null, |
| 428 | ?int $oldPageID = null |
| 429 | ): array { |
| 430 | $eventAttrs = $this->toCommonAttrs( |
| 431 | 'undelete', |
| 432 | $this->eventSerializer->timestampToDt( $eventTimestamp ), |
| 433 | $page, |
| 434 | $performer, |
| 435 | $currentRevision, |
| 436 | $redirectTarget, |
| 437 | $reason |
| 438 | ); |
| 439 | |
| 440 | // If this page had a different id in the archive table, |
| 441 | // then save it as the prior_state page_id. This will |
| 442 | // be the page_id that the page had before it was deleted, |
| 443 | // which is the same as the page_id that it had while it was |
| 444 | // in the archive table. |
| 445 | // Usually page_id will be the same, but there are some historical |
| 446 | // edge cases where a new page_id is created as part of an undelete. |
| 447 | if ( $oldPageID && $oldPageID != $page->getId() ) { |
| 448 | $eventAttrs['prior_state'] = [ |
| 449 | 'page' => [ |
| 450 | 'page_id' => $oldPageID |
| 451 | ] |
| 452 | ]; |
| 453 | } |
| 454 | |
| 455 | return $this->toEvent( $stream, $page, $eventAttrs ); |
| 456 | } |
| 457 | |
| 458 | /** |
| 459 | * Converts from the given page, RevisionRecord and previous RevisionRecord's visibility (deleted) |
| 460 | * bitfield to a page_change_kind: visibility_change event. |
| 461 | * |
| 462 | * @param string $stream |
| 463 | * @param ProperPageIdentity $page |
| 464 | * @param User|null $performer |
| 465 | * @param RevisionRecord $currentRevision |
| 466 | * @param int $priorVisibilityBitfield |
| 467 | * @param string|null $eventTimestamp |
| 468 | * @return array |
| 469 | */ |
| 470 | public function toVisibilityChangeEvent( |
| 471 | string $stream, |
| 472 | ProperPageIdentity $page, |
| 473 | ?User $performer, |
| 474 | RevisionRecord $currentRevision, |
| 475 | int $priorVisibilityBitfield, |
| 476 | ?string $eventTimestamp = null |
| 477 | ) { |
| 478 | $eventAttrs = $this->toCommonAttrs( |
| 479 | 'visibility_change', |
| 480 | $this->eventSerializer->timestampToDt( $eventTimestamp ), |
| 481 | $page, |
| 482 | $performer, |
| 483 | $currentRevision, |
| 484 | # NOTE: ArticleRevisionVisibilitySet does not give us the 'reason' (comment) |
| 485 | # the visibility has been changed. This info is provided in the UI by the user, |
| 486 | # where does it go? |
| 487 | # https://phabricator.wikimedia.org/T321411 |
| 488 | null |
| 489 | ); |
| 490 | |
| 491 | // During a visibility change, we are only representing the change to the revision's |
| 492 | // visibility. The rev_id that is being modified is at revision.rev_id. |
| 493 | // The rev_id has not changed. The prior_state.revision object will not contain |
| 494 | // any duplicate information about this revision. It will only contain the |
| 495 | // prior visibility fields for this revision that have been changed |
| 496 | $priorVisibilityFields = $this->revisionEntitySerializer->bitsToVisibilityAttrs( $priorVisibilityBitfield ); |
| 497 | $eventAttrs['prior_state']['revision'] = []; |
| 498 | foreach ( $priorVisibilityFields as $key => $value ) { |
| 499 | // Only set the old visibility field in prior state if it has changed. |
| 500 | if ( $eventAttrs['revision'][$key] !== $value ) { |
| 501 | $eventAttrs['prior_state']['revision'][$key] = $value; |
| 502 | } |
| 503 | } |
| 504 | |
| 505 | return $this->toEvent( $stream, $page, $eventAttrs ); |
| 506 | } |
| 507 | } |