ParametersHelper.php
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ParametersHelper.php
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	<?php

	namespace MediaWiki\EditPage;

	use MediaWiki\Context\RequestContext;
	use MediaWiki\Page\PageIdentity;
	use MediaWiki\Permissions\Authority;
	use MediaWiki\SpecialPage\SpecialPageFactory;
	use MediaWiki\Specials\SpecialMyLanguage;
	use MediaWiki\Title\Title;

	/**
	* Helper methods for resolving EditPage parameters that deal with page titles.
	*
	* @internal
	* @property SpecialPageFactory $specialPageFactory
	*/
	trait ParametersHelper {

	/**
	* If the given Title is Special:MyLanguage/Foo, resolve the language chain for the
	* actual target title desired.
	*
	* @param ?Title $title
	* @return ?Title
	*/
	private function getTargetTitleIfSpecialMyLanguage( ?Title $title ): ?Title {
	if ( $title && $title->isSpecialPage() ) {
	[ $spName, $spParam ] = $this->specialPageFactory->resolveAlias( $title->getText() );
	if ( $spName ) {
	$specialPage = $this->specialPageFactory->getPage( $spName );
	if ( $specialPage instanceof SpecialMyLanguage ) {
	// TODO This should pass a language as a parameter, instead of the whole context
	$specialPage->setContext( RequestContext::getMain() );
	$title = $specialPage->findTitleForTransclusion( $spParam );
	}
	}
	}

	return $title;
	}

	/**
	* Verify if a given title exists and the given user is allowed to view it
	*
	* @param PageIdentity\|null $page
	* @param Authority $performer
	* @return bool
	* @phan-assert-true-condition $page
	*/
	private function isPageExistingAndViewable( ?PageIdentity $page, Authority $performer ): bool {
	return $page && $page->exists() && $performer->authorizeRead( 'read', $page );
	}
	}