00001 <?php
00002
00011 class SpecialBookSources extends SpecialPage {
00012
00016 private $isbn = '';
00017
00021 public function __construct() {
00022 parent::__construct( 'Booksources' );
00023 }
00024
00030 public function execute( $isbn ) {
00031 global $wgOut, $wgRequest;
00032 $this->setHeaders();
00033 $this->isbn = self::cleanIsbn( $isbn ? $isbn : $wgRequest->getText( 'isbn' ) );
00034 $wgOut->addWikiMsg( 'booksources-summary' );
00035 $wgOut->addHTML( $this->makeForm() );
00036 if( strlen( $this->isbn ) > 0 ) {
00037 if( !self::isValidISBN( $this->isbn ) ) {
00038 $wgOut->wrapWikiMsg( '<div class="error">$1</div>', 'booksources-invalid-isbn' );
00039 }
00040 $this->showList();
00041 }
00042 }
00043
00048 public static function isValidISBN( $isbn ) {
00049 $isbn = self::cleanIsbn( $isbn );
00050 $sum = 0;
00051 $check = -1;
00052 if( strlen( $isbn ) == 13 ) {
00053 for( $i = 0; $i < 12; $i++ ) {
00054 if($i % 2 == 0) {
00055 $sum += $isbn{$i};
00056 } else {
00057 $sum += 3 * $isbn{$i};
00058 }
00059 }
00060
00061 $check = (10 - ($sum % 10)) % 10;
00062 if ($check == $isbn{12}) {
00063 return true;
00064 }
00065 } elseif( strlen( $isbn ) == 10 ) {
00066 for($i = 0; $i < 9; $i++) {
00067 $sum += $isbn{$i} * ($i + 1);
00068 }
00069
00070 $check = $sum % 11;
00071 if($check == 10) {
00072 $check = "X";
00073 }
00074 if($check == $isbn{9}) {
00075 return true;
00076 }
00077 }
00078 return false;
00079 }
00080
00081
00088 private static function cleanIsbn( $isbn ) {
00089 return trim( preg_replace( '![^0-9X]!', '', $isbn ) );
00090 }
00091
00097 private function makeForm() {
00098 global $wgScript;
00099 $title = self::getTitleFor( 'Booksources' );
00100 $form = '<fieldset><legend>' . wfMsgHtml( 'booksources-search-legend' ) . '</legend>';
00101 $form .= Xml::openElement( 'form', array( 'method' => 'get', 'action' => $wgScript ) );
00102 $form .= Xml::hidden( 'title', $title->getPrefixedText() );
00103 $form .= '<p>' . Xml::inputLabel( wfMsg( 'booksources-isbn' ), 'isbn', 'isbn', 20, $this->isbn );
00104 $form .= ' ' . Xml::submitButton( wfMsg( 'booksources-go' ) ) . '</p>';
00105 $form .= Xml::closeElement( 'form' );
00106 $form .= '</fieldset>';
00107 return $form;
00108 }
00109
00116 private function showList() {
00117 global $wgOut, $wgContLang;
00118
00119 # Hook to allow extensions to insert additional HTML,
00120 # e.g. for API-interacting plugins and so on
00121 wfRunHooks( 'BookInformation', array( $this->isbn, &$wgOut ) );
00122
00123 # Check for a local page such as Project:Book_sources and use that if available
00124 $title = Title::makeTitleSafe( NS_PROJECT, wfMsgForContent( 'booksources' ) ); # Show list in content language
00125 if( is_object( $title ) && $title->exists() ) {
00126 $rev = Revision::newFromTitle( $title );
00127 $wgOut->addWikiText( str_replace( 'MAGICNUMBER', $this->isbn, $rev->getText() ) );
00128 return true;
00129 }
00130
00131 # Fall back to the defaults given in the language file
00132 $wgOut->addWikiMsg( 'booksources-text' );
00133 $wgOut->addHTML( '<ul>' );
00134 $items = $wgContLang->getBookstoreList();
00135 foreach( $items as $label => $url )
00136 $wgOut->addHTML( $this->makeListItem( $label, $url ) );
00137 $wgOut->addHTML( '</ul>' );
00138 return true;
00139 }
00140
00148 private function makeListItem( $label, $url ) {
00149 $url = str_replace( '$1', $this->isbn, $url );
00150 return '<li><a href="' . htmlspecialchars( $url ) . '">' . htmlspecialchars( $label ) . '</a></li>';
00151 }
00152 }