* @ingroup SpecialPage
*/
class SpecialBookSources extends SpecialPage {
public function __construct() {
parent::__construct( 'Booksources' );
}
/**
* Show the special page
*
* @param string $isbn ISBN passed as a subpage parameter
*/
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(
"\n$1\n
",
'booksources-invalid-isbn'
);
}
$this->showList( $isbn );
}
}
/**
* Return whether a given ISBN (10 or 13) is valid.
*
* @param string $isbn ISBN passed for check
* @return bool
*/
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;
}
/**
* Trim ISBN and remove characters which aren't required
*
* @param string $isbn Unclean ISBN
* @return string
*/
private static function cleanIsbn( $isbn ) {
return trim( preg_replace( '![^0-9X]!', '', $isbn ) );
}
/**
* Generate a form to allow users to enter an ISBN
*
* @param string $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 );
}
/**
* Determine where to get the list of book sources from,
* format and output them
*
* @param string $isbn
* @throws MWException
* @return bool
*/
private function showList( $isbn ) {
$out = $this->getOutput();
$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->getText();
$out->addWikiTextAsInterface( 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( '' );
$items = MediaWikiServices::getInstance()->getContentLanguage()->getBookstoreList();
foreach ( $items as $label => $url ) {
$out->addHTML( $this->makeListItem( $isbn, $label, $url ) );
}
$out->addHTML( '
' );
return true;
}
/**
* Format a book source list item
*
* @param string $isbn
* @param string $label Book source label
* @param string $url Book source URL
* @return string
*/
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';
}
}