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| 1 | <?php |
| 2 | /** |
| 3 | * @license GPL-2.0-or-later |
| 4 | * @file |
| 5 | */ |
| 6 | |
| 7 | namespace MediaWiki\Page; |
| 8 | |
| 9 | use InvalidArgumentException; |
| 10 | use Wikimedia\Assert\Assert; |
| 11 | |
| 12 | /** |
| 13 | * Immutable value object representing a page identity. |
| 14 | * |
| 15 | * Instances of this class are expected to always represent proper pages, that is, |
| 16 | * pages that can at least potentially exist as editable pages on the wiki. |
| 17 | * This class cannot represent Special pages, interwiki links, section links, etc. |
| 18 | * |
| 19 | * Code that deserializes instances of PageIdentityValue must ensure that the original |
| 20 | * meaning of the "local" Wiki ID is preserved: When an instance of PageIdentityValue |
| 21 | * is created with self::LOCAL as the Wiki ID on one wiki, gets serialized, |
| 22 | * stored, and later read and unserialized on another wiki, the value of the Wiki ID |
| 23 | * must be adjusted to refer to the original wiki. |
| 24 | * |
| 25 | * @see https://www.mediawiki.org/wiki/Manual:Modeling_pages |
| 26 | * |
| 27 | * @since 1.36 |
| 28 | */ |
| 29 | class PageIdentityValue extends PageReferenceValue implements ProperPageIdentity { |
| 30 | |
| 31 | /** @var int */ |
| 32 | private $pageId; |
| 33 | |
| 34 | /** |
| 35 | * Constructs a PageIdentityValue, or returns null if the parameters are not valid. |
| 36 | * |
| 37 | * @note This does not perform any normalization, and only basic validation. |
| 38 | * For full normalization and validation, use TitleParser::makeTitleValueSafe() |
| 39 | * together with PageLookup::getPageForLink(). |
| 40 | * |
| 41 | * @param int $pageId The ID of this page, or 0 if the page does not exist. |
| 42 | * @param int $namespace A valid namespace ID. Validation is the caller's responsibility! |
| 43 | * @param string $dbKey A valid DB key. Validation is the caller's responsibility! |
| 44 | * @param string|false $wikiId The Id of the wiki this page belongs to, |
| 45 | * or self::LOCAL for the local wiki. The method {@link PageIdentityValue::localIdentity} |
| 46 | * is available as a shorthand for local wikis (only requires 3 parameters). |
| 47 | */ |
| 48 | public static function tryNew( int $pageId, int $namespace, string $dbKey, $wikiId ): ?static { |
| 49 | try { |
| 50 | return new static( $pageId, $namespace, $dbKey, $wikiId ); |
| 51 | } catch ( InvalidArgumentException ) { |
| 52 | return null; |
| 53 | } |
| 54 | } |
| 55 | |
| 56 | /** |
| 57 | * @param int $pageId The ID of this page, or 0 if the page does not exist. |
| 58 | * @param int $namespace A valid namespace ID. Validation is the caller's responsibility! |
| 59 | * @param string $dbKey A valid DB key. Validation is the caller's responsibility! |
| 60 | * @param string|false $wikiId The Id of the wiki this page belongs to, |
| 61 | * or self::LOCAL for the local wiki. |
| 62 | */ |
| 63 | public function __construct( int $pageId, int $namespace, string $dbKey, $wikiId ) { |
| 64 | Assert::parameter( $pageId >= 0, '$pageId', 'must not be negative' ); |
| 65 | Assert::parameter( $namespace >= 0, '$namespace', 'must not be negative' ); |
| 66 | |
| 67 | // Not full validation, intended to help detect lack of validation in the caller. |
| 68 | Assert::parameter( |
| 69 | !preg_match( '/[#|]/', $dbKey ), |
| 70 | '$dbKey', |
| 71 | 'must not contain pipes or hashes: ' . $dbKey |
| 72 | ); |
| 73 | |
| 74 | parent::__construct( $namespace, $dbKey, $wikiId ); |
| 75 | |
| 76 | $this->pageId = $pageId; |
| 77 | } |
| 78 | |
| 79 | /** |
| 80 | * Create PageIdentity for a local page. |
| 81 | * |
| 82 | * @param int $pageId |
| 83 | * @param int $namespace |
| 84 | * @param string $dbKey |
| 85 | * @return PageIdentityValue |
| 86 | */ |
| 87 | public static function localIdentity( int $pageId, int $namespace, string $dbKey ): self { |
| 88 | return new self( $pageId, $namespace, $dbKey, self::LOCAL ); |
| 89 | } |
| 90 | |
| 91 | /** |
| 92 | * The numerical page ID provided to the constructor. |
| 93 | * |
| 94 | * @param string|false $wikiId The wiki ID expected by the caller. |
| 95 | * Omit if expecting the local wiki. |
| 96 | * |
| 97 | * @return int |
| 98 | */ |
| 99 | public function getId( $wikiId = self::LOCAL ): int { |
| 100 | $this->assertWiki( $wikiId ); |
| 101 | return $this->pageId; |
| 102 | } |
| 103 | |
| 104 | /** |
| 105 | * Returns whether the page currently exists. |
| 106 | * Returns true if getId() returns a value greater than zero. |
| 107 | */ |
| 108 | public function exists(): bool { |
| 109 | return $this->getId( $this->getWikiId() ) > 0; |
| 110 | } |
| 111 | |
| 112 | /** |
| 113 | * @return bool always true |
| 114 | */ |
| 115 | public function canExist(): bool { |
| 116 | return true; |
| 117 | } |
| 118 | |
| 119 | } |