SpecialBooksources.php

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<?php
class SpecialBookSources extends SpecialPage {
    public function __construct() {
        parent::__construct( 'Booksources' );
    }

    public function execute( $isbn ) {
        $out = $this->getOutput();

        $this->setHeaders();
        $this->outputHeader();

        // User provided ISBN
        $isbn = $isbn ?: $this->getRequest()->getText( 'isbn' );
        $isbn = trim( $isbn );

        $this->buildForm( $isbn );

        if ( $isbn !== '' ) {
            if ( !self::isValidISBN( $isbn ) ) {
                $out->wrapWikiMsg(
                    "<div class=\"error\">\n$1\n</div>",
                    'booksources-invalid-isbn'
                );
            }

            $this->showList( $isbn );
        }
    }

    public static function isValidISBN( $isbn ) {
        $isbn = self::cleanIsbn( $isbn );
        $sum = 0;
        if ( strlen( $isbn ) == 13 ) {
            for ( $i = 0; $i < 12; $i++ ) {
                if ( $isbn[$i] === 'X' ) {
                    return false;
                } elseif ( $i % 2 == 0 ) {
                    $sum += $isbn[$i];
                } else {
                    $sum += 3 * $isbn[$i];
                }
            }

            $check = ( 10 - ( $sum % 10 ) ) % 10;
            if ( (string)$check === $isbn[12] ) {
                return true;
            }
        } elseif ( strlen( $isbn ) == 10 ) {
            for ( $i = 0; $i < 9; $i++ ) {
                if ( $isbn[$i] === 'X' ) {
                    return false;
                }
                $sum += $isbn[$i] * ( $i + 1 );
            }

            $check = $sum % 11;
            if ( $check == 10 ) {
                $check = "X";
            }
            if ( (string)$check === $isbn[9] ) {
                return true;
            }
        }

        return false;
    }

    private static function cleanIsbn( $isbn ) {
        return trim( preg_replace( '![^0-9X]!', '', $isbn ) );
    }

    private function buildForm( $isbn ) {
        $formDescriptor = [
            'isbn' => [
                'type' => 'text',
                'name' => 'isbn',
                'label-message' => 'booksources-isbn',
                'default' => $isbn,
                'autofocus' => true,
                'required' => true,
            ],
        ];

        $context = new DerivativeContext( $this->getContext() );
        $context->setTitle( $this->getPageTitle() );
        HTMLForm::factory( 'ooui', $formDescriptor, $context )
            ->setWrapperLegendMsg( 'booksources-search-legend' )
            ->setSubmitTextMsg( 'booksources-search' )
            ->setMethod( 'get' )
            ->prepareForm()
            ->displayForm( false );
    }

    private function showList( $isbn ) {
        $out = $this->getOutput();

        global $wgContLang;

        $isbn = self::cleanIsbn( $isbn );
        # Hook to allow extensions to insert additional HTML,
        # e.g. for API-interacting plugins and so on
        Hooks::run( 'BookInformation', [ $isbn, $out ] );

        # Check for a local page such as Project:Book_sources and use that if available
        $page = $this->msg( 'booksources' )->inContentLanguage()->text();
        $title = Title::makeTitleSafe( NS_PROJECT, $page ); # Show list in content language
        if ( is_object( $title ) && $title->exists() ) {
            $rev = Revision::newFromTitle( $title, false, Revision::READ_NORMAL );
            $content = $rev->getContent();

            if ( $content instanceof TextContent ) {
                // XXX: in the future, this could be stored as structured data, defining a list of book sources

                $text = $content->getNativeData();
                $out->addWikiText( str_replace( 'MAGICNUMBER', $isbn, $text ) );

                return true;
            } else {
                throw new MWException( "Unexpected content type for book sources: " . $content->getModel() );
            }
        }

        # Fall back to the defaults given in the language file
        $out->addWikiMsg( 'booksources-text' );
        $out->addHTML( '<ul>' );
        $items = $wgContLang->getBookstoreList();
        foreach ( $items as $label => $url ) {
            $out->addHTML( $this->makeListItem( $isbn, $label, $url ) );
        }
        $out->addHTML( '</ul>' );

        return true;
    }

    private function makeListItem( $isbn, $label, $url ) {
        $url = str_replace( '$1', $isbn, $url );

        return Html::rawElement( 'li', [],
            Html::element( 'a', [ 'href' => $url, 'class' => 'external' ], $label )
        );
    }

    protected function getGroupName() {
        return 'wiki';
    }
}