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<?php
namespace EntitySchema\MediaWiki\Specials;
use HttpError;
use InvalidArgumentException;
use SpecialPage;
use Title;
use EntitySchema\Domain\Model\SchemaId;
use EntitySchema\MediaWiki\Content\EntitySchemaContent;
use EntitySchema\Services\SchemaConverter\SchemaConverter;
use WikiPage;
/**
 * @license GPL-2.0-or-later
 */
class EntitySchemaText extends SpecialPage {
    public function __construct() {
        parent::__construct(
            'EntitySchemaText',
            'read'
        );
    }
    public function execute( $subPage ) {
        parent::execute( $subPage );
        $schemaId = $this->getIdFromSubpage( $subPage );
        if ( !$schemaId ) {
            $this->getOutput()->addWikiMsg( 'entityschema-schematext-text' );
            $this->getOutput()->returnToMain();
            return;
        }
        $title = Title::makeTitle( NS_ENTITYSCHEMA_JSON, $schemaId->getId() );
        if ( !$title->exists() ) {
            throw new HttpError( 404, $this->getOutput()->msg(
                'entityschema-schematext-missing', $subPage
            ) );
        }
        $this->sendContentSchemaText( WikiPage::factory( $title )->getContent(), $schemaId );
    }
    public function getDescription() {
        return $this->msg( 'special-schematext' )->text();
    }
    protected function getGroupName() {
        return 'wikibase';
    }
    private function sendContentSchemaText( EntitySchemaContent $schemaContent, SchemaId $id ) {
        $converter = new SchemaConverter();
        $schemaText = $converter->getSchemaText( $schemaContent->getText() );
        $out = $this->getOutput();
        $out->disable();
        $webResponse = $out->getRequest()->response();
        $webResponse->header( 'Content-Type: text/shex; charset=UTF-8' );
        $webResponse->header( 'Content-Disposition:  attachment; filename="' . $id->getId() . '.shex"' );
        // The data here is always public, so allow anyone to access it (similar to Special:EntityData)
        $webResponse->header( 'Access-Control-Allow-Origin: *' );
        ob_clean(); // remove anything that might already be in the output buffer.
        echo $schemaText;
    }
    /**
     * @param string $subPage
     *
     * @return false|SchemaId
     */
    private function getIdFromSubpage( $subPage ) {
        if ( !$subPage ) {
            return false;
        }
        try {
            $schemaId = new SchemaId( $subPage );
        } catch ( InvalidArgumentException $e ) {
            return false;
        }
        return $schemaId;
    }
}