SpecialBooksources.php

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<?php
class SpecialBookSources extends SpecialPage {

        private $isbn = '';

        public function __construct() {
                parent::__construct( 'Booksources' );
        }

        public function execute( $isbn ) {
                $this->setHeaders();
                $this->outputHeader();
                $this->isbn = self::cleanIsbn( $isbn ? $isbn : $this->getRequest()->getText( 'isbn' ) );
                $this->getOutput()->addHTML( $this->makeForm() );
                if( strlen( $this->isbn ) > 0 ) {
                        if( !self::isValidISBN( $this->isbn ) ) {
                                $this->getOutput()->wrapWikiMsg( "<div class=\"error\">\n$1\n</div>", 'booksources-invalid-isbn' );
                        }
                        $this->showList();
                }
        }

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

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

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

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

        private function makeForm() {
                global $wgScript;

                $form  = '<fieldset><legend>' . $this->msg( 'booksources-search-legend' )->escaped() . '</legend>';
                $form .= Xml::openElement( 'form', array( 'method' => 'get', 'action' => $wgScript ) );
                $form .= Html::hidden( 'title', $this->getTitle()->getPrefixedText() );
                $form .= '<p>' . Xml::inputLabel( $this->msg( 'booksources-isbn' )->text(), 'isbn', 'isbn', 20, $this->isbn );
                $form .= '&#160;' . Xml::submitButton( $this->msg( 'booksources-go' )->text() ) . '</p>';
                $form .= Xml::closeElement( 'form' );
                $form .= '</fieldset>';
                return $form;
        }

        private function showList() {
                global $wgContLang;

                # Hook to allow extensions to insert additional HTML,
                # e.g. for API-interacting plugins and so on
                wfRunHooks( 'BookInformation', array( $this->isbn, $this->getOutput() ) );

                # 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 );
                        $this->getOutput()->addWikiText( str_replace( 'MAGICNUMBER', $this->isbn, $rev->getText() ) );
                        return true;
                }

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

        private function makeListItem( $label, $url ) {
                $url = str_replace( '$1', $this->isbn, $url );
                return '<li><a href="' . htmlspecialchars( $url ) . '" class="external">' . htmlspecialchars( $label ) . '</a></li>';
        }
}