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| 1 | <?php |
| 2 | |
| 3 | namespace FileImporter\Services; |
| 4 | |
| 5 | use FileImporter\Data\SourceUrl; |
| 6 | use FileImporter\Remote\MediaWiki\SiteTableSiteLookup; |
| 7 | use FileImporter\Services\Http\HttpRequestExecutor; |
| 8 | use MediaWiki\Config\Config; |
| 9 | use Psr\Log\LoggerInterface; |
| 10 | use RuntimeException; |
| 11 | |
| 12 | /** |
| 13 | * FIXME: Rename the class to something like WikibaseSiteLinkLookup, and just remove all occurences |
| 14 | * of "NowCommons" as well as "Template" from this code. Reasoning: Even if this code was written |
| 15 | * for a very specific purpose (the NowCommons template), this class does not contain any knowledge |
| 16 | * about templates, and no knowledge about a specific Wikibase installation. |
| 17 | * |
| 18 | * This service fetches an Item from a Wikibase instance (both specified via configuration), and |
| 19 | * returns the sitelink that matches a given source URL, if such a sitelink exists. In other words: |
| 20 | * It checks if the source site contains a localized version of a page, and returns it. |
| 21 | * |
| 22 | * @license GPL-2.0-or-later |
| 23 | */ |
| 24 | class WikidataTemplateLookup { |
| 25 | |
| 26 | /** @var string */ |
| 27 | private $entityEndpoint; |
| 28 | /** @var string|null */ |
| 29 | private $nowCommonsEntityId; |
| 30 | |
| 31 | /** @var string[][] Array mapping site id and entity id to a template title name */ |
| 32 | private array $templateCache = []; |
| 33 | |
| 34 | public function __construct( |
| 35 | Config $config, |
| 36 | private readonly SiteTableSiteLookup $siteLookup, |
| 37 | private readonly HttpRequestExecutor $requestExecutor, |
| 38 | private readonly LoggerInterface $logger, |
| 39 | ) { |
| 40 | $this->entityEndpoint = $config->get( 'FileImporterWikidataEntityEndpoint' ); |
| 41 | $this->nowCommonsEntityId = $config->get( 'FileImporterWikidataNowCommonsEntity' ) ?: null; |
| 42 | } |
| 43 | |
| 44 | /** |
| 45 | * Fetch the source wiki template title corresponding to `NowCommons` |
| 46 | * |
| 47 | * @param SourceUrl $sourceUrl Source URL, used to look up source site ID. |
| 48 | * |
| 49 | * @return string|null Local template title, without namespace prefix. |
| 50 | */ |
| 51 | public function fetchNowCommonsLocalTitle( SourceUrl $sourceUrl ): ?string { |
| 52 | try { |
| 53 | return $this->fetchLocalTemplateForSource( $this->nowCommonsEntityId, $sourceUrl ); |
| 54 | } catch ( RuntimeException $ex ) { |
| 55 | $this->logger->error( 'Failed to fetch template mapping from Wikidata: ' . |
| 56 | $ex->getMessage() ); |
| 57 | return null; |
| 58 | } |
| 59 | } |
| 60 | |
| 61 | private function fetchLocalTemplateForSource( ?string $entityId, SourceUrl $sourceUrl ): ?string { |
| 62 | $sourceSite = $this->siteLookup->getSite( $sourceUrl ); |
| 63 | if ( !$sourceSite || !$entityId ) { |
| 64 | return null; |
| 65 | } |
| 66 | |
| 67 | $localPageName = $this->fetchSiteLinkPageName( $entityId, $sourceSite->getGlobalId() ); |
| 68 | if ( $localPageName === null ) { |
| 69 | return null; |
| 70 | } |
| 71 | |
| 72 | return $this->removeNamespace( $localPageName ); |
| 73 | } |
| 74 | |
| 75 | private function fetchSiteLinkPageName( string $entityId, string $siteId ): ?string { |
| 76 | if ( isset( $this->templateCache[$siteId][$entityId] ) ) { |
| 77 | return $this->templateCache[$siteId][$entityId]; |
| 78 | } |
| 79 | |
| 80 | $url = $this->entityEndpoint . $entityId; |
| 81 | $response = $this->requestExecutor->execute( $url ); |
| 82 | $entityData = json_decode( $response->getContent(), true ); |
| 83 | $this->templateCache[$siteId][$entityId] = |
| 84 | $entityData['entities'][$entityId]['sitelinks'][$siteId]['title'] ?? null; |
| 85 | |
| 86 | return $this->templateCache[$siteId][$entityId]; |
| 87 | } |
| 88 | |
| 89 | /** |
| 90 | * FIXME: copied from WikitextConversions, should use Title methods instead. |
| 91 | */ |
| 92 | private function removeNamespace( string $title ): string { |
| 93 | return array_last( explode( ':', $title, 2 ) ); |
| 94 | } |
| 95 | |
| 96 | } |