Add a View RDF link to the page-tools sidebar

The per-page RDF export (GET /rest.php/neowiki/v0/page/{pageId}/rdf) was only
reachable by hand-constructing the URL. Add a "View RDF" link to the NeoWiki
page-tools sidebar section, next to "View JSON", pointing at the current page's
Turtle export.

It is shown only when the page has Subjects, so it never points at the
endpoint's 404-on-empty response. It uses ?format=turtle so the result renders
as readable text in the browser instead of downloading a TriG file, and targets
the native projection. Per-ontology projection links and a per-subject RDF
endpoint (#1087) are out of
scope here.

Relates to #1023

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: 2 people

i18n/en.json

@@ -42,6 +42,7 @@
 	"neowiki-page-tools-view-subjects": "View subjects",
 	"neowiki-page-tools-edit-json": "View or edit JSON",
 	"neowiki-page-tools-view-json": "View JSON",
+	"neowiki-page-tools-rdf": "View RDF",
 
 	"neowiki-property-editor-name": "Name",
 	"neowiki-property-editor-type": "Type",

i18n/qqq.json

@@ -43,6 +43,7 @@
 	"neowiki-page-tools-view-subjects": "Read-only counterpart of neowiki-page-tools-manage-subjects: label for the sidebar link to the Subject management page, shown to users who lack edit permission.",
 	"neowiki-page-tools-edit-json": "Label for the sidebar link that navigates to Special:NeoJson for the current page. Only visible when development UIs are enabled.",
 	"neowiki-page-tools-view-json": "Read-only counterpart of neowiki-page-tools-edit-json: label for the sidebar link to Special:NeoJson, shown to users who lack edit permission. Only visible when development UIs are enabled.",
+	"neowiki-page-tools-rdf": "Label for the sidebar link that opens the current page's RDF export (Turtle serialization of the page's Subjects), served by the per-page RDF REST endpoint. Only shown when the page has NeoWiki Subjects.",
 
 	"neowiki-subject-creator-creating-schema": "Subtitle shown in the subject creator dialog header when the user is creating a new schema.",
 	"neowiki-subject-creator-create-schema": "Label for the button that creates a new schema in the subject creator dialog.",

src/EntryPoints/NeoWikiHooks.php

@@ -300,11 +300,16 @@ public static function onSidebarBeforeOutput( Skin $skin, array &$sidebar ): voi
 		$hints = $extension->newSubjectPermissionHints( $skin->getAuthority() );
 		$pageId = new PageId( $title->getArticleID() );
 
+		$isContentNamespace = MediaWikiServices::getInstance()
+			->getNamespaceInfo()
+			->isContent( $title->getNamespace() );
+
 		$neoWikiTools = ( new PageToolsBuilder() )->build(
 			title: $title,
-			isContentNamespace: MediaWikiServices::getInstance()
-				->getNamespaceInfo()
-				->isContent( $title->getNamespace() ),
+			pageId: $title->getArticleID(),
+			isContentNamespace: $isContentNamespace,
+			hasSubjects: $isContentNamespace
+				&& $extension->newPageSubjectsLookup()->pageHasSubjects( $pageId ),
 			canCreateMainSubject: $hints->canCreateMainSubject( $pageId ),
 			canEditSubject: $hints->canEditSubject( $pageId ),
 			isLatestRevision: self::pageIsLatestRevision( $skin->getOutput() ),

src/Presentation/PageToolsBuilder.php

@@ -15,7 +15,9 @@ class PageToolsBuilder {
 	 */
 	public function build(
 		Title $title,
+		int $pageId,
 		bool $isContentNamespace,
+		bool $hasSubjects,
 		bool $canCreateMainSubject,
 		bool $canEditSubject,
 		bool $isLatestRevision,
@@ -49,6 +51,15 @@ public function build(
 			];
 		}
 
+		if ( $hasSubjects ) {
+			$items[] = [
+				'text' => wfMessage( 'neowiki-page-tools-rdf' )->text(),
+				'href' => wfScript( 'rest' ) . '/neowiki/v0/page/'
+					. $pageId . '/rdf?format=turtle',
+				'id' => 't-neowiki-rdf',
+			];
+		}
+
 		if ( $devUiEnabled ) {
 			$items[] = [
 				'text' => wfMessage(

tests/phpunit/Presentation/PageToolsBuilderTest.php

@@ -15,6 +15,7 @@
 class PageToolsBuilderTest extends MediaWikiIntegrationTestCase {
 
 	private const PAGE_NAME = 'PageToolsBuilderTestPage';
+	private const PAGE_ID = 42;
 
 	public function testReturnsNoItemsOutsideContentNamespace(): void {
 		$this->assertSame(
@@ -28,9 +29,32 @@ public function testShowsAllItemsWhenEverythingOpenAndDevUiEnabled(): void {
 			[
 				$this->createSubjectItem(),
 				$this->manageSubjectsItem(),
+				$this->rdfItem(),
 				$this->editJsonItem(),
 			],
-			$this->build()
+			$this->build( hasSubjects: true )
+		);
+	}
+
+	public function testShowsRdfLinkWhenPageHasSubjects(): void {
+		$this->assertSame(
+			[ $this->manageSubjectsItem(), $this->rdfItem() ],
+			$this->build(
+				hasSubjects: true,
+				canCreateMainSubject: false,
+				devUiEnabled: false
+			)
+		);
+	}
+
+	public function testHidesRdfLinkWhenPageHasNoSubjects(): void {
+		$this->assertSame(
+			[ $this->manageSubjectsItem() ],
+			$this->build(
+				hasSubjects: false,
+				canCreateMainSubject: false,
+				devUiEnabled: false
+			)
 		);
 	}
 
@@ -101,6 +125,7 @@ public function testUsesViewLabelsWhenUserCannotEditSubjects(): void {
 	 */
 	private function build(
 		bool $isContentNamespace = true,
+		bool $hasSubjects = false,
 		bool $canCreateMainSubject = true,
 		bool $canEditSubject = true,
 		bool $isLatestRevision = true,
@@ -109,7 +134,9 @@ private function build(
 	): array {
 		return ( new PageToolsBuilder() )->build(
 			title: Title::newFromText( self::PAGE_NAME ),
+			pageId: self::PAGE_ID,
 			isContentNamespace: $isContentNamespace,
+			hasSubjects: $hasSubjects,
 			canCreateMainSubject: $canCreateMainSubject,
 			canEditSubject: $canEditSubject,
 			isLatestRevision: $isLatestRevision,
@@ -143,6 +170,18 @@ private function manageSubjectsItem( string $messageKey = 'neowiki-page-tools-ma
 		];
 	}
 
+	/**
+	 * @return array<string, mixed>
+	 */
+	private function rdfItem(): array {
+		return [
+			'text' => wfMessage( 'neowiki-page-tools-rdf' )->text(),
+			'href' => wfScript( 'rest' ) . '/neowiki/v0/page/'
+				. self::PAGE_ID . '/rdf?format=turtle',
+			'id' => 't-neowiki-rdf',
+		];
+	}
+
 	/**
 	 * @return array<string, mixed>
 	 */