1 files changed, 110 insertions, 0 deletions
diff --git a/includes/specials/SpecialBooksources.php b/includes/specials/SpecialBooksources.php
new file mode 100644
index 00000000..0690c5c0
--- /dev/null
+++ b/includes/specials/SpecialBooksources.php
@@ -0,0 +1,110 @@
+<?php
+
+/**
+ * Special page outputs information on sourcing a book with a particular ISBN
+ * The parser creates links to this page when dealing with ISBNs in wikitext
+ *
+ * @author Rob Church <robchur@gmail.com>
+ * @todo Validate ISBNs using the standard check-digit method
+ * @ingroup SpecialPages
+ */
+class SpecialBookSources extends SpecialPage {
+
+	/**
+	 * ISBN passed to the page, if any
+	 */
+	private $isbn = '';
+
+	/**
+	 * Constructor
+	 */
+	public function __construct() {
+		parent::__construct( 'Booksources' );
+	}
+
+	/**
+	 * Show the special page
+	 *
+	 * @param $isbn ISBN passed as a subpage parameter
+	 */
+	public function execute( $isbn ) {
+		global $wgOut, $wgRequest;
+		$this->setHeaders();
+		$this->isbn = $this->cleanIsbn( $isbn ? $isbn : $wgRequest->getText( 'isbn' ) );
+		$wgOut->addWikiMsg( 'booksources-summary' );
+		$wgOut->addHtml( $this->makeForm() );
+		if( strlen( $this->isbn ) > 0 )
+			$this->showList();
+	}
+
+	/**
+	 * Trim ISBN and remove characters which aren't required
+	 *
+	 * @param $isbn Unclean ISBN
+	 * @return string
+	 */
+	private function cleanIsbn( $isbn ) {
+		return trim( preg_replace( '![^0-9X]!', '', $isbn ) );
+	}
+
+	/**
+	 * Generate a form to allow users to enter an ISBN
+	 *
+	 * @return string
+	 */
+	private function makeForm() {
+		global $wgScript;
+		$title = self::getTitleFor( 'Booksources' );
+		$form  = '<fieldset><legend>' . wfMsgHtml( 'booksources-search-legend' ) . '</legend>';
+		$form .= Xml::openElement( 'form', array( 'method' => 'get', 'action' => $wgScript ) );
+		$form .= Xml::hidden( 'title', $title->getPrefixedText() );
+		$form .= '<p>' . Xml::inputLabel( wfMsg( 'booksources-isbn' ), 'isbn', 'isbn', 20, $this->isbn );
+		$form .= '&nbsp;' . Xml::submitButton( wfMsg( 'booksources-go' ) ) . '</p>';
+		$form .= Xml::closeElement( 'form' );
+		$form .= '</fieldset>';
+		return $form;
+	}
+
+	/**
+	 * Determine where to get the list of book sources from,
+	 * format and output them
+	 *
+	 * @return string
+	 */
+	private function showList() {
+		global $wgOut, $wgContLang;
+
+		# Hook to allow extensions to insert additional HTML,
+		# e.g. for API-interacting plugins and so on
+		wfRunHooks( 'BookInformation', array( $this->isbn, &$wgOut ) );
+
+		# Check for a local page such as Project:Book_sources and use that if available
+		$title = Title::makeTitleSafe( NS_PROJECT, wfMsgForContent( 'booksources' ) ); # Show list in content language
+		if( is_object( $title ) && $title->exists() ) {
+			$rev = Revision::newFromTitle( $title );
+			$wgOut->addWikiText( str_replace( 'MAGICNUMBER', $this->isbn, $rev->getText() ) );
+			return true;
+		}
+
+		# Fall back to the defaults given in the language file
+		$wgOut->addWikiMsg( 'booksources-text' );
+		$wgOut->addHtml( '<ul>' );
+		$items = $wgContLang->getBookstoreList();
+		foreach( $items as $label => $url )
+			$wgOut->addHtml( $this->makeListItem( $label, $url ) );
+		$wgOut->addHtml( '</ul>' );
+		return true;
+	}
+
+	/**
+	 * Format a book source list item
+	 *
+	 * @param $label Book source label
+	 * @param $url Book source URL
+	 * @return string
+	 */
+	private function makeListItem( $label, $url ) {
+		$url = str_replace( '$1', $this->isbn, $url );
+		return '<li><a href="' . htmlspecialchars( $url ) . '">' . htmlspecialchars( $label ) . '</a></li>';
+	}
+}