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| 1 | <?php |
| 2 | /** |
| 3 | * Value object representing a content slot associated with a page revision. |
| 4 | * |
| 5 | * @license GPL-2.0-or-later |
| 6 | * @file |
| 7 | */ |
| 8 | |
| 9 | namespace MediaWiki\Revision; |
| 10 | |
| 11 | use InvalidArgumentException; |
| 12 | use LogicException; |
| 13 | use MediaWiki\Content\Content; |
| 14 | use OutOfBoundsException; |
| 15 | use Wikimedia\Assert\Assert; |
| 16 | use Wikimedia\NonSerializable\NonSerializableTrait; |
| 17 | |
| 18 | /** |
| 19 | * Value object representing a content slot associated with a page revision. |
| 20 | * SlotRecord provides direct access to a Content object. |
| 21 | * That access may be implemented through a callback. |
| 22 | * |
| 23 | * @since 1.31 |
| 24 | * @since 1.32 Renamed from MediaWiki\Storage\SlotRecord |
| 25 | */ |
| 26 | class SlotRecord { |
| 27 | use NonSerializableTrait; |
| 28 | |
| 29 | public const MAIN = 'main'; |
| 30 | |
| 31 | /** |
| 32 | * @var \stdClass database result row, as a raw object. Callbacks are supported for field values, |
| 33 | * to enable on-demand emulation of these values. This is primarily intended for use |
| 34 | * during schema migration. |
| 35 | */ |
| 36 | private $row; |
| 37 | |
| 38 | /** |
| 39 | * @var Content|callable |
| 40 | */ |
| 41 | private $content; |
| 42 | |
| 43 | /** |
| 44 | * @var bool |
| 45 | */ |
| 46 | private $derived; |
| 47 | |
| 48 | /** |
| 49 | * Returns a new SlotRecord just like the given $slot, except that calling getContent() |
| 50 | * will fail with an exception. |
| 51 | * |
| 52 | * @param SlotRecord $slot |
| 53 | * |
| 54 | * @return SlotRecord |
| 55 | */ |
| 56 | public static function newWithSuppressedContent( SlotRecord $slot ) { |
| 57 | $row = $slot->row; |
| 58 | |
| 59 | return new SlotRecord( |
| 60 | $row, |
| 61 | static function (): never { |
| 62 | throw new SuppressedDataException( 'Content suppressed!' ); |
| 63 | } |
| 64 | ); |
| 65 | } |
| 66 | |
| 67 | /** |
| 68 | * Returns a SlotRecord for a derived slot. |
| 69 | * |
| 70 | * @param string $role |
| 71 | * @param Content $content Initial content |
| 72 | * |
| 73 | * @return SlotRecord |
| 74 | * @since 1.36 |
| 75 | */ |
| 76 | public static function newDerived( string $role, Content $content ) { |
| 77 | return self::newUnsaved( $role, $content, true ); |
| 78 | } |
| 79 | |
| 80 | /** |
| 81 | * Constructs a new SlotRecord from an existing SlotRecord, overriding some fields. |
| 82 | * The slot's content cannot be overwritten. |
| 83 | * |
| 84 | * @param SlotRecord $slot |
| 85 | * @param array $overrides |
| 86 | * |
| 87 | * @return SlotRecord |
| 88 | */ |
| 89 | private static function newFromSlotRecord( SlotRecord $slot, array $overrides = [] ) { |
| 90 | $row = clone $slot->row; |
| 91 | $row->slot_id = null; // never copy the row ID! |
| 92 | |
| 93 | foreach ( $overrides as $key => $value ) { |
| 94 | $row->$key = $value; |
| 95 | } |
| 96 | |
| 97 | return new SlotRecord( $row, $slot->content, $slot->isDerived() ); |
| 98 | } |
| 99 | |
| 100 | /** |
| 101 | * Constructs a new SlotRecord for a new revision, inheriting the content of the given SlotRecord |
| 102 | * of a previous revision. |
| 103 | * |
| 104 | * Note that a SlotRecord constructed this way are intended as prototypes, |
| 105 | * to be used wit newSaved(). They are incomplete, so some getters such as |
| 106 | * getRevision() will fail. |
| 107 | * |
| 108 | * @param SlotRecord $slot |
| 109 | * |
| 110 | * @return SlotRecord |
| 111 | */ |
| 112 | public static function newInherited( SlotRecord $slot ) { |
| 113 | // We can't inherit from a Slot that's not attached to a revision. |
| 114 | $slot->getRevision(); |
| 115 | $slot->getOrigin(); |
| 116 | $slot->getAddress(); |
| 117 | |
| 118 | // NOTE: slot_origin and content_address are copied from $slot. |
| 119 | return self::newFromSlotRecord( $slot, [ |
| 120 | 'slot_revision_id' => null, |
| 121 | ] ); |
| 122 | } |
| 123 | |
| 124 | /** |
| 125 | * Constructs a new Slot from a Content object for a new revision. |
| 126 | * This is the preferred way to construct a slot for storing Content that |
| 127 | * resulted from a user edit. The slot is assumed to be not inherited. |
| 128 | * |
| 129 | * Note that a SlotRecord constructed this way are intended as prototypes, |
| 130 | * to be used wit newSaved(). They are incomplete, so some getters such as |
| 131 | * getAddress() will fail. |
| 132 | * |
| 133 | * @param string $role |
| 134 | * @param Content $content |
| 135 | * @param bool $derived |
| 136 | * @return SlotRecord An incomplete proto-slot object, to be used with newSaved() later. |
| 137 | */ |
| 138 | public static function newUnsaved( string $role, Content $content, bool $derived = false ) { |
| 139 | $row = [ |
| 140 | 'slot_id' => null, // not yet known |
| 141 | 'slot_revision_id' => null, // not yet known |
| 142 | 'slot_origin' => null, // not yet known, will be set in newSaved() |
| 143 | 'content_size' => null, // compute later |
| 144 | 'content_sha1' => null, // compute later |
| 145 | 'slot_content_id' => null, // not yet known, will be set in newSaved() |
| 146 | 'content_address' => null, // not yet known, will be set in newSaved() |
| 147 | 'role_name' => $role, |
| 148 | 'model_name' => $content->getModel(), |
| 149 | ]; |
| 150 | |
| 151 | return new SlotRecord( (object)$row, $content, $derived ); |
| 152 | } |
| 153 | |
| 154 | /** |
| 155 | * Constructs a complete SlotRecord for a newly saved revision, based on the incomplete |
| 156 | * proto-slot. This adds information that has only become available during saving, |
| 157 | * particularly the revision ID, content ID and content address. |
| 158 | * |
| 159 | * @param int $revisionId the revision the slot is to be associated with (field slot_revision_id). |
| 160 | * If $protoSlot already has a revision, it must be the same. |
| 161 | * @param int|null $contentId the ID of the row in the content table describing the content |
| 162 | * referenced by $contentAddress (field slot_content_id). |
| 163 | * If $protoSlot already has a content ID, it must be the same. |
| 164 | * @param string $contentAddress the slot's content address (field content_address). |
| 165 | * If $protoSlot already has an address, it must be the same. |
| 166 | * @param SlotRecord $protoSlot The proto-slot that was provided as input for creating a new |
| 167 | * revision. $protoSlot must have a content address if inherited. |
| 168 | * |
| 169 | * @return SlotRecord If the state of $protoSlot is inappropriate for saving a new revision. |
| 170 | */ |
| 171 | public static function newSaved( |
| 172 | int $revisionId, |
| 173 | ?int $contentId, |
| 174 | string $contentAddress, |
| 175 | SlotRecord $protoSlot |
| 176 | ) { |
| 177 | if ( $protoSlot->hasRevision() && $protoSlot->getRevision() !== $revisionId ) { |
| 178 | throw new LogicException( |
| 179 | "Mismatching revision ID $revisionId: " |
| 180 | . "The slot already belongs to revision {$protoSlot->getRevision()}. " |
| 181 | . "Use SlotRecord::newInherited() to re-use content between revisions." |
| 182 | ); |
| 183 | } |
| 184 | |
| 185 | if ( $protoSlot->hasAddress() && $protoSlot->getAddress() !== $contentAddress ) { |
| 186 | throw new LogicException( |
| 187 | "Mismatching blob address $contentAddress: " |
| 188 | . "The slot already has content at {$protoSlot->getAddress()}." |
| 189 | ); |
| 190 | } |
| 191 | |
| 192 | if ( $protoSlot->hasContentId() && $protoSlot->getContentId() !== $contentId ) { |
| 193 | throw new LogicException( |
| 194 | "Mismatching content ID $contentId: " |
| 195 | . "The slot already has content row {$protoSlot->getContentId()} associated." |
| 196 | ); |
| 197 | } |
| 198 | |
| 199 | if ( $protoSlot->isInherited() ) { |
| 200 | if ( !$protoSlot->hasAddress() ) { |
| 201 | throw new InvalidArgumentException( |
| 202 | "An inherited blob should have a content address!" |
| 203 | ); |
| 204 | } |
| 205 | if ( !$protoSlot->hasField( 'slot_origin' ) ) { |
| 206 | throw new InvalidArgumentException( |
| 207 | "A saved inherited slot should have an origin set!" |
| 208 | ); |
| 209 | } |
| 210 | $origin = $protoSlot->getOrigin(); |
| 211 | } else { |
| 212 | $origin = $revisionId; |
| 213 | } |
| 214 | |
| 215 | return self::newFromSlotRecord( $protoSlot, [ |
| 216 | 'slot_revision_id' => $revisionId, |
| 217 | 'slot_content_id' => $contentId, |
| 218 | 'slot_origin' => $origin, |
| 219 | 'content_address' => $contentAddress, |
| 220 | ] ); |
| 221 | } |
| 222 | |
| 223 | /** |
| 224 | * The following fields are supported by the $row parameter: |
| 225 | * |
| 226 | * $row->blob_data |
| 227 | * $row->blob_address |
| 228 | * |
| 229 | * @param \stdClass $row A database row composed of fields of the slot and content tables, |
| 230 | * as a raw object. Any field value can be a callback that produces the field value |
| 231 | * given this SlotRecord as a parameter. However, plain strings cannot be used as |
| 232 | * callbacks here, for security reasons. |
| 233 | * @param Content|callable $content The content object associated with the slot, or a |
| 234 | * callback that will return that Content object, given this SlotRecord as a parameter. |
| 235 | * @param bool $derived Is this handler for a derived slot? Derived slots allow information that |
| 236 | * is derived from the content of a page to be stored even if it is generated |
| 237 | * asynchronously or updated later. Their size is not included in the revision size, |
| 238 | * their hash does not contribute to the revision hash, and updates are not included |
| 239 | * in revision history. |
| 240 | */ |
| 241 | public function __construct( \stdClass $row, $content, bool $derived = false ) { |
| 242 | Assert::parameterType( [ Content::class, 'callable' ], $content, '$content' ); |
| 243 | |
| 244 | Assert::parameter( |
| 245 | property_exists( $row, 'slot_revision_id' ), |
| 246 | '$row->slot_revision_id', |
| 247 | 'must exist' |
| 248 | ); |
| 249 | Assert::parameter( |
| 250 | property_exists( $row, 'slot_content_id' ), |
| 251 | '$row->slot_content_id', |
| 252 | 'must exist' |
| 253 | ); |
| 254 | Assert::parameter( |
| 255 | property_exists( $row, 'content_address' ), |
| 256 | '$row->content_address', |
| 257 | 'must exist' |
| 258 | ); |
| 259 | Assert::parameter( |
| 260 | property_exists( $row, 'model_name' ), |
| 261 | '$row->model_name', |
| 262 | 'must exist' |
| 263 | ); |
| 264 | Assert::parameter( |
| 265 | property_exists( $row, 'slot_origin' ), |
| 266 | '$row->slot_origin', |
| 267 | 'must exist' |
| 268 | ); |
| 269 | Assert::parameter( |
| 270 | !property_exists( $row, 'slot_inherited' ), |
| 271 | '$row->slot_inherited', |
| 272 | 'must not exist' |
| 273 | ); |
| 274 | Assert::parameter( |
| 275 | !property_exists( $row, 'slot_revision' ), |
| 276 | '$row->slot_revision', |
| 277 | 'must not exist' |
| 278 | ); |
| 279 | |
| 280 | $this->row = $row; |
| 281 | $this->content = $content; |
| 282 | $this->derived = $derived; |
| 283 | } |
| 284 | |
| 285 | /** |
| 286 | * Returns the Content of the given slot. |
| 287 | * |
| 288 | * @note This is free to load Content from whatever subsystem is necessary, |
| 289 | * performing potentially expensive operations and triggering I/O-related |
| 290 | * failure modes. |
| 291 | * |
| 292 | * @note This method does not apply audience filtering. |
| 293 | * |
| 294 | * @throws SuppressedDataException if access to the content is not allowed according |
| 295 | * to the audience check performed by RevisionRecord::getSlot(). |
| 296 | * @throws BadRevisionException if the revision is permanently missing |
| 297 | * @throws RevisionAccessException for other storage access errors |
| 298 | * |
| 299 | * @return Content The slot's content. This is a direct reference to the internal instance, |
| 300 | * copy before exposing to application logic! |
| 301 | */ |
| 302 | public function getContent() { |
| 303 | if ( $this->content instanceof Content ) { |
| 304 | return $this->content; |
| 305 | } |
| 306 | |
| 307 | $obj = ( $this->content )( $this ); |
| 308 | |
| 309 | Assert::postcondition( |
| 310 | $obj instanceof Content, |
| 311 | 'Slot content callback should return a Content object' |
| 312 | ); |
| 313 | |
| 314 | $this->content = $obj; |
| 315 | |
| 316 | return $this->content; |
| 317 | } |
| 318 | |
| 319 | /** |
| 320 | * Returns the string value of a data field from the database row supplied to the constructor. |
| 321 | * If the field was set to a callback, that callback is invoked and the result returned. |
| 322 | * |
| 323 | * @param string $name |
| 324 | * |
| 325 | * @throws OutOfBoundsException |
| 326 | * @throws IncompleteRevisionException |
| 327 | * @return mixed Returns the field's value, never null. |
| 328 | */ |
| 329 | private function getField( $name ) { |
| 330 | if ( !isset( $this->row->$name ) ) { |
| 331 | // distinguish between unknown and uninitialized fields |
| 332 | if ( property_exists( $this->row, $name ) ) { |
| 333 | throw new IncompleteRevisionException( |
| 334 | 'Uninitialized field: {name}', |
| 335 | [ 'name' => $name ] |
| 336 | ); |
| 337 | } else { |
| 338 | throw new OutOfBoundsException( 'No such field: ' . $name ); |
| 339 | } |
| 340 | } |
| 341 | |
| 342 | $value = $this->row->$name; |
| 343 | |
| 344 | // NOTE: allow callbacks, but don't trust plain string callables from the database! |
| 345 | if ( !is_string( $value ) && is_callable( $value ) ) { |
| 346 | $value = $value( $this ); |
| 347 | $this->setField( $name, $value ); |
| 348 | } |
| 349 | |
| 350 | return $value; |
| 351 | } |
| 352 | |
| 353 | /** |
| 354 | * Returns the string value of a data field from the database row supplied to the constructor. |
| 355 | * |
| 356 | * @param string $name |
| 357 | * |
| 358 | * @throws OutOfBoundsException |
| 359 | * @throws IncompleteRevisionException |
| 360 | * @return string |
| 361 | */ |
| 362 | private function getStringField( $name ) { |
| 363 | return strval( $this->getField( $name ) ); |
| 364 | } |
| 365 | |
| 366 | /** |
| 367 | * Returns the int value of a data field from the database row supplied to the constructor. |
| 368 | * |
| 369 | * @param string $name |
| 370 | * |
| 371 | * @throws OutOfBoundsException |
| 372 | * @throws IncompleteRevisionException |
| 373 | * @return int |
| 374 | */ |
| 375 | private function getIntField( $name ) { |
| 376 | return intval( $this->getField( $name ) ); |
| 377 | } |
| 378 | |
| 379 | /** |
| 380 | * @param string $name |
| 381 | * @return bool whether this record contains the given field |
| 382 | */ |
| 383 | private function hasField( $name ) { |
| 384 | if ( isset( $this->row->$name ) ) { |
| 385 | // if the field is a callback, resolve first, then re-check |
| 386 | if ( !is_string( $this->row->$name ) && is_callable( $this->row->$name ) ) { |
| 387 | $this->getField( $name ); |
| 388 | } |
| 389 | } |
| 390 | |
| 391 | return isset( $this->row->$name ); |
| 392 | } |
| 393 | |
| 394 | /** |
| 395 | * Returns the ID of the revision this slot is associated with. |
| 396 | * |
| 397 | * @return int |
| 398 | */ |
| 399 | public function getRevision() { |
| 400 | return $this->getIntField( 'slot_revision_id' ); |
| 401 | } |
| 402 | |
| 403 | /** |
| 404 | * Returns the revision ID of the revision that originated the slot's content. |
| 405 | * |
| 406 | * @return int |
| 407 | */ |
| 408 | public function getOrigin() { |
| 409 | return $this->getIntField( 'slot_origin' ); |
| 410 | } |
| 411 | |
| 412 | /** |
| 413 | * Whether this slot was inherited from an older revision. |
| 414 | * |
| 415 | * If this SlotRecord is already attached to a revision, this returns true |
| 416 | * if the slot's revision of origin is the same as the revision it belongs to. |
| 417 | * |
| 418 | * If this SlotRecord is not yet attached to a revision, this returns true |
| 419 | * if the slot already has an address. |
| 420 | * |
| 421 | * @return bool |
| 422 | */ |
| 423 | public function isInherited() { |
| 424 | if ( $this->hasRevision() ) { |
| 425 | return $this->getRevision() !== $this->getOrigin(); |
| 426 | } else { |
| 427 | return $this->hasAddress(); |
| 428 | } |
| 429 | } |
| 430 | |
| 431 | /** |
| 432 | * Whether this slot has an address. Slots will have an address if their |
| 433 | * content has been stored. While building a new revision, |
| 434 | * SlotRecords will not have an address associated. |
| 435 | * |
| 436 | * @return bool |
| 437 | */ |
| 438 | public function hasAddress() { |
| 439 | return $this->hasField( 'content_address' ); |
| 440 | } |
| 441 | |
| 442 | /** |
| 443 | * Whether this slot has an origin (revision ID that originated the slot's content. |
| 444 | * |
| 445 | * @since 1.32 |
| 446 | * |
| 447 | * @return bool |
| 448 | */ |
| 449 | public function hasOrigin() { |
| 450 | return $this->hasField( 'slot_origin' ); |
| 451 | } |
| 452 | |
| 453 | /** |
| 454 | * Whether this slot has a content ID. Slots will have a content ID if their |
| 455 | * content has been stored in the content table. While building a new revision, |
| 456 | * SlotRecords will not have an ID associated. |
| 457 | * |
| 458 | * Also, during schema migration, hasContentId() may return false when encountering an |
| 459 | * un-migrated database entry in SCHEMA_COMPAT_WRITE_BOTH mode. |
| 460 | * It will however always return true for saved revisions on SCHEMA_COMPAT_READ_NEW mode, |
| 461 | * or without SCHEMA_COMPAT_WRITE_NEW mode. In the latter case, an emulated content ID |
| 462 | * is used, derived from the revision's text ID. |
| 463 | * |
| 464 | * Note that hasContentId() returning false while hasRevision() returns true always |
| 465 | * indicates an unmigrated row in SCHEMA_COMPAT_WRITE_BOTH mode, as described above. |
| 466 | * For an unsaved slot, both these methods would return false. |
| 467 | * |
| 468 | * @since 1.32 |
| 469 | * |
| 470 | * @return bool |
| 471 | */ |
| 472 | public function hasContentId() { |
| 473 | return $this->hasField( 'slot_content_id' ); |
| 474 | } |
| 475 | |
| 476 | /** |
| 477 | * Whether this slot has revision ID associated. Slots will have a revision ID associated |
| 478 | * only if they were loaded as part of an existing revision. While building a new revision, |
| 479 | * Slotrecords will not have a revision ID associated. |
| 480 | * |
| 481 | * @return bool |
| 482 | */ |
| 483 | public function hasRevision() { |
| 484 | return $this->hasField( 'slot_revision_id' ); |
| 485 | } |
| 486 | |
| 487 | /** |
| 488 | * Returns the role of the slot. |
| 489 | * |
| 490 | * @return string |
| 491 | */ |
| 492 | public function getRole() { |
| 493 | return $this->getStringField( 'role_name' ); |
| 494 | } |
| 495 | |
| 496 | /** |
| 497 | * Returns the address of this slot's content. |
| 498 | * This address can be used with BlobStore to load the Content object. |
| 499 | * |
| 500 | * @return string |
| 501 | */ |
| 502 | public function getAddress() { |
| 503 | return $this->getStringField( 'content_address' ); |
| 504 | } |
| 505 | |
| 506 | /** |
| 507 | * Returns the ID of the content meta data row associated with the slot. |
| 508 | * This information should be irrelevant to application logic, it is here to allow |
| 509 | * the construction of a full row for the revision table. |
| 510 | * |
| 511 | * Note that this method may return an emulated value during schema migration in |
| 512 | * SCHEMA_COMPAT_WRITE_OLD mode. See RevisionStore::emulateContentId for more information. |
| 513 | * |
| 514 | * @return int |
| 515 | */ |
| 516 | public function getContentId() { |
| 517 | return $this->getIntField( 'slot_content_id' ); |
| 518 | } |
| 519 | |
| 520 | /** |
| 521 | * Returns the content size |
| 522 | * |
| 523 | * @return int size of the content, in bogo-bytes, as reported by Content::getSize. |
| 524 | */ |
| 525 | public function getSize() { |
| 526 | try { |
| 527 | $size = $this->getIntField( 'content_size' ); |
| 528 | } catch ( IncompleteRevisionException ) { |
| 529 | $size = $this->getContent()->getSize(); |
| 530 | $this->setField( 'content_size', $size ); |
| 531 | } |
| 532 | |
| 533 | return $size; |
| 534 | } |
| 535 | |
| 536 | /** |
| 537 | * Returns the content size |
| 538 | * |
| 539 | * @return string hash of the content. |
| 540 | */ |
| 541 | public function getSha1() { |
| 542 | try { |
| 543 | $sha1 = $this->getStringField( 'content_sha1' ); |
| 544 | } catch ( IncompleteRevisionException ) { |
| 545 | $sha1 = null; |
| 546 | } |
| 547 | |
| 548 | // Compute if missing. Missing could mean null or empty. |
| 549 | if ( $sha1 === null || $sha1 === '' ) { |
| 550 | $format = $this->hasField( 'format_name' ) |
| 551 | ? $this->getStringField( 'format_name' ) |
| 552 | : null; |
| 553 | |
| 554 | $data = $this->getContent()->serialize( $format ); |
| 555 | $sha1 = self::base36Sha1( $data ); |
| 556 | $this->setField( 'content_sha1', $sha1 ); |
| 557 | } |
| 558 | |
| 559 | return $sha1; |
| 560 | } |
| 561 | |
| 562 | /** |
| 563 | * Returns the content model. This is the model name that decides |
| 564 | * which ContentHandler is appropriate for interpreting the |
| 565 | * data of the blob referenced by the address returned by getAddress(). |
| 566 | * |
| 567 | * @return string the content model of the content |
| 568 | */ |
| 569 | public function getModel() { |
| 570 | try { |
| 571 | $model = $this->getStringField( 'model_name' ); |
| 572 | } catch ( IncompleteRevisionException ) { |
| 573 | $model = $this->getContent()->getModel(); |
| 574 | $this->setField( 'model_name', $model ); |
| 575 | } |
| 576 | |
| 577 | return $model; |
| 578 | } |
| 579 | |
| 580 | /** |
| 581 | * Returns the blob serialization format as a MIME type. |
| 582 | * |
| 583 | * @note When this method returns null, the caller is expected |
| 584 | * to auto-detect the serialization format, or to rely on |
| 585 | * the default format associated with the content model. |
| 586 | * |
| 587 | * @return string|null |
| 588 | */ |
| 589 | public function getFormat() { |
| 590 | // XXX: we currently do not plan to store the format for each slot! |
| 591 | |
| 592 | if ( $this->hasField( 'format_name' ) ) { |
| 593 | return $this->getStringField( 'format_name' ); |
| 594 | } |
| 595 | |
| 596 | return null; |
| 597 | } |
| 598 | |
| 599 | /** |
| 600 | * @param string $name |
| 601 | * @param string|int|null $value |
| 602 | */ |
| 603 | private function setField( $name, $value ) { |
| 604 | $this->row->$name = $value; |
| 605 | } |
| 606 | |
| 607 | /** |
| 608 | * Get the base 36 SHA-1 value for a string of text |
| 609 | * |
| 610 | * MCR migration note: this replaced Revision::base36Sha1 |
| 611 | * |
| 612 | * @param string $blob |
| 613 | * @return string |
| 614 | */ |
| 615 | public static function base36Sha1( $blob ) { |
| 616 | return \Wikimedia\base_convert( sha1( $blob ), 16, 36, 31 ); |
| 617 | } |
| 618 | |
| 619 | /** |
| 620 | * Returns true if $other has the same content as this slot. |
| 621 | * The check is performed based on the model, address size, and hash. |
| 622 | * Two slots can have the same content if they use different content addresses, |
| 623 | * but if they have the same address and the same model, they have the same content. |
| 624 | * Two slots can have the same content if they belong to different |
| 625 | * revisions or pages. |
| 626 | * |
| 627 | * Note that hasSameContent() may return false even if Content::equals returns true for |
| 628 | * the content of two slots. This may happen if the two slots have different serializations |
| 629 | * representing equivalent Content. Such false negatives are considered acceptable. Code |
| 630 | * that has to be absolutely sure the Content is really not the same if hasSameContent() |
| 631 | * returns false should call getContent() and compare the Content objects directly. |
| 632 | * |
| 633 | * @since 1.32 |
| 634 | * |
| 635 | * @param SlotRecord $other |
| 636 | * @return bool |
| 637 | */ |
| 638 | public function hasSameContent( SlotRecord $other ) { |
| 639 | if ( $other === $this ) { |
| 640 | return true; |
| 641 | } |
| 642 | |
| 643 | if ( $this->getModel() !== $other->getModel() ) { |
| 644 | return false; |
| 645 | } |
| 646 | |
| 647 | if ( $this->hasAddress() |
| 648 | && $other->hasAddress() |
| 649 | && $this->getAddress() == $other->getAddress() |
| 650 | ) { |
| 651 | return true; |
| 652 | } |
| 653 | |
| 654 | if ( $this->getSize() !== $other->getSize() ) { |
| 655 | return false; |
| 656 | } |
| 657 | |
| 658 | if ( $this->getSha1() !== $other->getSha1() ) { |
| 659 | return false; |
| 660 | } |
| 661 | |
| 662 | return true; |
| 663 | } |
| 664 | |
| 665 | /** |
| 666 | * @return bool Is this a derived slot? |
| 667 | * @since 1.36 |
| 668 | */ |
| 669 | public function isDerived(): bool { |
| 670 | return $this->derived; |
| 671 | } |
| 672 | |
| 673 | } |