Feature: #102715 - New frontend.page.information request attribute 

See forge#102715

Description 

TYPO3 v13 introduces the new frontend-related PSR-7 request attribute frontend.page.information implemented by class \TYPO3\CMS\Frontend\Page\PageInformation . The object aims to replace various page related properties of \TYPO3\CMS\Frontend\Controller\TyposcriptFrontendController.

Note the class is currently still marked as experimental. Extension authors are however encouraged to use information from this request attribute instead of the TyposcriptFrontendController properties already: TYPO3 Core v13 will try to not break especially the getters / properties not marked as @internal.

Impact 

There are three properties in TyposcriptFrontendController frequently used by extensions, which are now modeled in \TYPO3\CMS\Frontend\Page\PageInformation . The attribute is attached to the PSR-7 frontend request by middleware TypoScriptFrontendInitialization, middlewares below can rely on existence of that attribute. Examples:

$pageInformation = $request->getAttribute('frontend.page.information');
// Formerly $tsfe->id
$id = $pageInformation->getId();
// Formerly $tsfe->page
$page = $pageInformation->getPageRecord();
// Formerly $tsfe->rootLine
$rootLine = $pageInformation->getRootLine();
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