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1 |
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 | private SiteTableSiteLookup $siteLookup; |
27 | private HttpRequestExecutor $requestExecutor; |
28 | private LoggerInterface $logger; |
29 | /** @var string */ |
30 | private $entityEndpoint; |
31 | /** @var string|null */ |
32 | private $nowCommonsEntityId; |
33 | |
34 | /** @var string[][] Array mapping site id and entity id to a template title name */ |
35 | private array $templateCache = []; |
36 | |
37 | public function __construct( |
38 | Config $config, |
39 | SiteTableSiteLookup $siteLookup, |
40 | HttpRequestExecutor $requestExecutor, |
41 | LoggerInterface $logger |
42 | ) { |
43 | $this->siteLookup = $siteLookup; |
44 | $this->requestExecutor = $requestExecutor; |
45 | $this->logger = $logger; |
46 | |
47 | $this->entityEndpoint = $config->get( 'FileImporterWikidataEntityEndpoint' ); |
48 | $this->nowCommonsEntityId = $config->get( 'FileImporterWikidataNowCommonsEntity' ) ?: null; |
49 | } |
50 | |
51 | /** |
52 | * Fetch the source wiki template title corresponding to `NowCommons` |
53 | * |
54 | * @param SourceUrl $sourceUrl Source URL, used to look up source site ID. |
55 | * |
56 | * @return string|null Local template title, without namespace prefix. |
57 | */ |
58 | public function fetchNowCommonsLocalTitle( SourceUrl $sourceUrl ): ?string { |
59 | try { |
60 | return $this->fetchLocalTemplateForSource( $this->nowCommonsEntityId, $sourceUrl ); |
61 | } catch ( RuntimeException $ex ) { |
62 | $this->logger->error( 'Failed to fetch template mapping from Wikidata: ' . |
63 | $ex->getMessage() ); |
64 | return null; |
65 | } |
66 | } |
67 | |
68 | private function fetchLocalTemplateForSource( ?string $entityId, SourceUrl $sourceUrl ): ?string { |
69 | $sourceSite = $this->siteLookup->getSite( $sourceUrl ); |
70 | if ( !$sourceSite || !$entityId ) { |
71 | return null; |
72 | } |
73 | |
74 | $localPageName = $this->fetchSiteLinkPageName( $entityId, $sourceSite->getGlobalId() ); |
75 | if ( $localPageName === null ) { |
76 | return null; |
77 | } |
78 | |
79 | return $this->removeNamespace( $localPageName ); |
80 | } |
81 | |
82 | private function fetchSiteLinkPageName( string $entityId, string $siteId ): ?string { |
83 | if ( isset( $this->templateCache[$siteId][$entityId] ) ) { |
84 | return $this->templateCache[$siteId][$entityId]; |
85 | } |
86 | |
87 | $url = $this->entityEndpoint . $entityId; |
88 | $response = $this->requestExecutor->execute( $url ); |
89 | $entityData = json_decode( $response->getContent(), true ); |
90 | $this->templateCache[$siteId][$entityId] = |
91 | $entityData['entities'][$entityId]['sitelinks'][$siteId]['title'] ?? null; |
92 | |
93 | return $this->templateCache[$siteId][$entityId]; |
94 | } |
95 | |
96 | /** |
97 | * FIXME: copied from WikitextConversions, should use Title methods instead. |
98 | */ |
99 | private function removeNamespace( string $title ): string { |
100 | $splitTitle = explode( ':', $title, 2 ); |
101 | return end( $splitTitle ); |
102 | } |
103 | |
104 | } |