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| 1 | <?php |
| 2 | |
| 3 | namespace GrowthExperiments\NewcomerTasks; |
| 4 | |
| 5 | use FormatJson; |
| 6 | use GrowthExperiments\NewcomerTasks\TaskType\TaskType; |
| 7 | use InvalidArgumentException; |
| 8 | use JsonContent; |
| 9 | use MediaWiki\Linker\LinkTarget; |
| 10 | use MediaWiki\MediaWikiServices; |
| 11 | use MediaWiki\Page\WikiPageFactory; |
| 12 | use MediaWiki\Title\Title; |
| 13 | use MediaWiki\Title\TitleValue; |
| 14 | use StatusValue; |
| 15 | use Wikimedia\Assert\Assert; |
| 16 | |
| 17 | /** |
| 18 | * Base class for recommendation providers for testing purposes. Looks for a `/<type>.json` |
| 19 | * subpage of the target page, and returns the contents of that page as link data. `<type>` |
| 20 | * is a keyword that's different for each recommendation type. |
| 21 | * |
| 22 | * Enable the subclass(es) you want by adding the following to LocalSettings.php or a similar place: |
| 23 | * $class = <subpage recommendation provider subclass>; |
| 24 | * $wgHooks['MediaWikiServices'][] = "$class::onMediaWikiServices"; |
| 25 | * $wgHooks['ContentHandlerDefaultModelFor'][] = "$class::onContentHandlerDefaultModelFor"; |
| 26 | */ |
| 27 | abstract class SubpageRecommendationProvider implements RecommendationProvider { |
| 28 | |
| 29 | /** @var string The name to use for subpages (without .json). Subclasses must provide this. */ |
| 30 | protected static $subpageName = null; |
| 31 | |
| 32 | /** |
| 33 | * @var string The MediaWiki service to replace, which returns the provider object. |
| 34 | * Subclasses must provide this. |
| 35 | */ |
| 36 | protected static $serviceName = null; |
| 37 | |
| 38 | /** @var string|array Name of the Recommendation subclass(es). Subclasses of this class must provide this. */ |
| 39 | protected static $recommendationTaskTypeClass = null; |
| 40 | |
| 41 | /** @var WikiPageFactory */ |
| 42 | private $wikiPageFactory; |
| 43 | |
| 44 | /** @var RecommendationProvider */ |
| 45 | private $fallbackRecommendationProvider; |
| 46 | |
| 47 | /** |
| 48 | * Create the recommendation object from the JSON representation. |
| 49 | * @param Title $title The page the recommendation is for. |
| 50 | * @param TaskType $taskType |
| 51 | * @param array $data Recommendation data (ie. the content of the JSON subpage). |
| 52 | * @param array $suggestionFilters |
| 53 | * @return Recommendation|StatusValue |
| 54 | */ |
| 55 | abstract public function createRecommendation( |
| 56 | Title $title, |
| 57 | TaskType $taskType, |
| 58 | array $data, |
| 59 | array $suggestionFilters = [] |
| 60 | ); |
| 61 | |
| 62 | /** |
| 63 | * @param WikiPageFactory $wikiPageFactory |
| 64 | * @param RecommendationProvider $fallbackRecommendationProvider |
| 65 | */ |
| 66 | public function __construct( |
| 67 | WikiPageFactory $wikiPageFactory, |
| 68 | RecommendationProvider $fallbackRecommendationProvider |
| 69 | ) { |
| 70 | Assert::precondition( static::$subpageName !== null, |
| 71 | 'subclasses must override $subpageName' ); |
| 72 | $this->wikiPageFactory = $wikiPageFactory; |
| 73 | $this->fallbackRecommendationProvider = $fallbackRecommendationProvider; |
| 74 | } |
| 75 | |
| 76 | /** @inheritDoc */ |
| 77 | public function get( LinkTarget $title, TaskType $taskType ) { |
| 78 | Assert::parameterType( static::$recommendationTaskTypeClass, $taskType, '$taskType' ); |
| 79 | |
| 80 | $subpageName = static::$subpageName; |
| 81 | $subpageTitleText = $title->getDBkey() . "/$subpageName.json"; |
| 82 | $subpageTitle = new TitleValue( $title->getNamespace(), $subpageTitleText ); |
| 83 | try { |
| 84 | $subpage = $this->wikiPageFactory->newFromLinkTarget( $subpageTitle ); |
| 85 | } catch ( InvalidArgumentException $e ) { |
| 86 | // happens for nonsensical namespaces, like Media: |
| 87 | return StatusValue::newFatal( 'rawmessage', $e->getMessage() ); |
| 88 | } |
| 89 | |
| 90 | if ( !$subpage->exists() ) { |
| 91 | if ( $this->fallbackRecommendationProvider ) { |
| 92 | return $this->fallbackRecommendationProvider->get( $title, $taskType ); |
| 93 | } else { |
| 94 | // This is a development-only provider, no point in translating its messages. |
| 95 | return StatusValue::newFatal( 'rawmessage', "No /$subpageName.json subpage found" ); |
| 96 | } |
| 97 | } |
| 98 | |
| 99 | $content = $subpage->getContent(); |
| 100 | if ( !$content instanceof JsonContent ) { |
| 101 | return StatusValue::newFatal( 'rawmessage', |
| 102 | "/$subpageName.json subpage is not a JSON page." ); |
| 103 | } |
| 104 | $dataStatus = FormatJson::parse( $content->getText(), FormatJson::FORCE_ASSOC ); |
| 105 | if ( !$dataStatus->isOK() ) { |
| 106 | return $dataStatus; |
| 107 | } |
| 108 | $data = $dataStatus->getValue(); |
| 109 | |
| 110 | // Turn $title into a real Title |
| 111 | $title = $this->wikiPageFactory->newFromLinkTarget( $title )->getTitle(); |
| 112 | |
| 113 | return $this->createRecommendation( $title, $taskType, $data, $taskType->getSuggestionFilters() ); |
| 114 | } |
| 115 | |
| 116 | /** |
| 117 | * MediaWikiServices hook handler, for development setups only. |
| 118 | * @param MediaWikiServices $services |
| 119 | * @see https://www.mediawiki.org/wiki/Manual:Hooks/MediaWikiServices |
| 120 | */ |
| 121 | public static function onMediaWikiServices( MediaWikiServices $services ) { |
| 122 | Assert::precondition( static::$serviceName !== null, |
| 123 | 'subclasses must override $serviceName' ); |
| 124 | $services->addServiceManipulator( static::$serviceName, |
| 125 | static function ( |
| 126 | RecommendationProvider $recommendationProvider, |
| 127 | MediaWikiServices $services |
| 128 | ) { |
| 129 | return new static( $services->getWikiPageFactory(), $recommendationProvider ); |
| 130 | } ); |
| 131 | } |
| 132 | |
| 133 | /** |
| 134 | * ContentHandlerDefaultModelFor hook handler, for development setups only. |
| 135 | * @param Title $title |
| 136 | * @param string &$model |
| 137 | * @see https://www.mediawiki.org/wiki/Manual:Hooks/ContentHandlerDefaultModelFor |
| 138 | */ |
| 139 | public static function onContentHandlerDefaultModelFor( Title $title, &$model ) { |
| 140 | // This is for development, so we want to ignore $wgNamespacesWithSubpages. |
| 141 | $titleText = $title->getText(); |
| 142 | $titleParts = explode( '/', $titleText ); |
| 143 | $subpage = end( $titleParts ); |
| 144 | if ( $subpage === static::$subpageName . '.json' && $subpage !== $titleText ) { |
| 145 | $model = CONTENT_MODEL_JSON; |
| 146 | } |
| 147 | } |
| 148 | |
| 149 | } |