includes/specials/SpecialBooksources.php

   1 <?php
   2 /**
   3  * Implements Special:Booksources
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup SpecialPage
  22  */
  23
  24 /**
  25  * Special page outputs information on sourcing a book with a particular ISBN
  26  * The parser creates links to this page when dealing with ISBNs in wikitext
  27  *
  28  * @author Rob Church <robchur@gmail.com>
  29  * @ingroup SpecialPage
  30  */
  31 class SpecialBookSources extends SpecialPage {
  32         public function __construct() {
  33                 parent::__construct( 'Booksources' );
  34         }
  35
  36         /**
  37          * Show the special page
  38          *
  39          * @param string $isbn ISBN passed as a subpage parameter
  40          */
  41         public function execute( $isbn ) {
  42                 $out = $this->getOutput();
  43
  44                 $this->setHeaders();
  45                 $this->outputHeader();
  46
  47                 // User provided ISBN
  48                 $isbn = $isbn ?: $this->getRequest()->getText( 'isbn' );
  49                 $isbn = trim( $isbn );
  50
  51                 $this->buildForm( $isbn );
  52
  53                 if ( $isbn !== '' ) {
  54                         if ( !self::isValidISBN( $isbn ) ) {
  55                                 $out->wrapWikiMsg(
  56                                         "<div class=\"error\">\n$1\n</div>",
  57                                         'booksources-invalid-isbn'
  58                                 );
  59                         }
  60
  61                         $this->showList( $isbn );
  62                 }
  63         }
  64
  65         /**
  66          * Return whether a given ISBN (10 or 13) is valid.
  67          *
  68          * @param string $isbn ISBN passed for check
  69          * @return bool
  70          */
  71         public static function isValidISBN( $isbn ) {
  72                 $isbn = self::cleanIsbn( $isbn );
  73                 $sum = 0;
  74                 if ( strlen( $isbn ) == 13 ) {
  75                         for ( $i = 0; $i < 12; $i++ ) {
  76                                 if ( $isbn[$i] === 'X' ) {
  77                                         return false;
  78                                 } elseif ( $i % 2 == 0 ) {
  79                                         $sum += $isbn[$i];
  80                                 } else {
  81                                         $sum += 3 * $isbn[$i];
  82                                 }
  83                         }
  84
  85                         $check = ( 10 - ( $sum % 10 ) ) % 10;
  86                         if ( (string)$check === $isbn[12] ) {
  87                                 return true;
  88                         }
  89                 } elseif ( strlen( $isbn ) == 10 ) {
  90                         for ( $i = 0; $i < 9; $i++ ) {
  91                                 if ( $isbn[$i] === 'X' ) {
  92                                         return false;
  93                                 }
  94                                 $sum += $isbn[$i] * ( $i + 1 );
  95                         }
  96
  97                         $check = $sum % 11;
  98                         if ( $check == 10 ) {
  99                                 $check = "X";
 100                         }
 101                         if ( (string)$check === $isbn[9] ) {
 102                                 return true;
 103                         }
 104                 }
 105
 106                 return false;
 107         }
 108
 109         /**
 110          * Trim ISBN and remove characters which aren't required
 111          *
 112          * @param string $isbn Unclean ISBN
 113          * @return string
 114          */
 115         private static function cleanIsbn( $isbn ) {
 116                 return trim( preg_replace( '![^0-9X]!', '', $isbn ) );
 117         }
 118
 119         /**
 120          * Generate a form to allow users to enter an ISBN
 121          *
 122          * @param string $isbn
 123          */
 124         private function buildForm( $isbn ) {
 125                 $formDescriptor = [
 126                         'isbn' => [
 127                                 'type' => 'text',
 128                                 'name' => 'isbn',
 129                                 'label-message' => 'booksources-isbn',
 130                                 'default' => $isbn,
 131                                 'autofocus' => true,
 132                                 'required' => true,
 133                         ],
 134                 ];
 135
 136                 $context = new DerivativeContext( $this->getContext() );
 137                 $context->setTitle( $this->getPageTitle() );
 138                 HTMLForm::factory( 'ooui', $formDescriptor, $context )
 139                         ->setWrapperLegendMsg( 'booksources-search-legend' )
 140                         ->setSubmitTextMsg( 'booksources-search' )
 141                         ->setMethod( 'get' )
 142                         ->prepareForm()
 143                         ->displayForm( false );
 144         }
 145
 146         /**
 147          * Determine where to get the list of book sources from,
 148          * format and output them
 149          *
 150          * @param string $isbn
 151          * @throws MWException
 152          * @return bool
 153          */
 154         private function showList( $isbn ) {
 155                 $out = $this->getOutput();
 156
 157                 global $wgContLang;
 158
 159                 $isbn = self::cleanIsbn( $isbn );
 160                 # Hook to allow extensions to insert additional HTML,
 161                 # e.g. for API-interacting plugins and so on
 162                 Hooks::run( 'BookInformation', [ $isbn, $out ] );
 163
 164                 # Check for a local page such as Project:Book_sources and use that if available
 165                 $page = $this->msg( 'booksources' )->inContentLanguage()->text();
 166                 $title = Title::makeTitleSafe( NS_PROJECT, $page ); # Show list in content language
 167                 if ( is_object( $title ) && $title->exists() ) {
 168                         $rev = Revision::newFromTitle( $title, false, Revision::READ_NORMAL );
 169                         $content = $rev->getContent();
 170
 171                         if ( $content instanceof TextContent ) {
 172                                 // XXX: in the future, this could be stored as structured data, defining a list of book sources
 173
 174                                 $text = $content->getNativeData();
 175                                 $out->addWikiText( str_replace( 'MAGICNUMBER', $isbn, $text ) );
 176
 177                                 return true;
 178                         } else {
 179                                 throw new MWException( "Unexpected content type for book sources: " . $content->getModel() );
 180                         }
 181                 }
 182
 183                 # Fall back to the defaults given in the language file
 184                 $out->addWikiMsg( 'booksources-text' );
 185                 $out->addHTML( '<ul>' );
 186                 $items = $wgContLang->getBookstoreList();
 187                 foreach ( $items as $label => $url ) {
 188                         $out->addHTML( $this->makeListItem( $isbn, $label, $url ) );
 189                 }
 190                 $out->addHTML( '</ul>' );
 191
 192                 return true;
 193         }
 194
 195         /**
 196          * Format a book source list item
 197          *
 198          * @param string $isbn
 199          * @param string $label Book source label
 200          * @param string $url Book source URL
 201          * @return string
 202          */
 203         private function makeListItem( $isbn, $label, $url ) {
 204                 $url = str_replace( '$1', $isbn, $url );
 205
 206                 return Html::rawElement( 'li', [],
 207                         Html::element( 'a', [ 'href' => $url, 'class' => 'external' ], $label )
 208                 );
 209         }
 210
 211         protected function getGroupName() {
 212                 return 'wiki';
 213         }
 214 }