includes/specials/SpecialExpandTemplates.php

   1 <?php
   2 /**
   3  * Implements Special:ExpandTemplates
   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  * A special page that expands submitted templates, parser functions,
  26  * and variables, allowing easier debugging of these.
  27  *
  28  * @ingroup SpecialPage
  29  */
  30 class SpecialExpandTemplates extends SpecialPage {
  31
  32         /** @var bool Whether or not to show the XML parse tree */
  33         protected $generateXML;
  34
  35         /** @var bool Whether or not to show the raw HTML code */
  36         protected $generateRawHtml;
  37
  38         /** @var bool Whether or not to remove comments in the expanded wikitext */
  39         protected $removeComments;
  40
  41         /** @var bool Whether or not to remove <nowiki> tags in the expanded wikitext */
  42         protected $removeNowiki;
  43
  44         /** @var int Maximum size in bytes to include. 50MB allows fixing those huge pages */
  45         const MAX_INCLUDE_SIZE = 50000000;
  46
  47         function __construct() {
  48                 parent::__construct( 'ExpandTemplates' );
  49         }
  50
  51         /**
  52          * Show the special page
  53          * @param string|null $subpage
  54          */
  55         function execute( $subpage ) {
  56                 global $wgParser;
  57
  58                 $this->setHeaders();
  59                 $this->addHelpLink( 'Help:ExpandTemplates' );
  60
  61                 $request = $this->getRequest();
  62                 $titleStr = $request->getText( 'wpContextTitle' );
  63                 $title = Title::newFromText( $titleStr );
  64
  65                 if ( !$title ) {
  66                         $title = $this->getPageTitle();
  67                 }
  68                 $input = $request->getText( 'wpInput' );
  69                 $this->generateXML = $request->getBool( 'wpGenerateXml' );
  70                 $this->generateRawHtml = $request->getBool( 'wpGenerateRawHtml' );
  71
  72                 if ( strlen( $input ) ) {
  73                         $this->removeComments = $request->getBool( 'wpRemoveComments', false );
  74                         $this->removeNowiki = $request->getBool( 'wpRemoveNowiki', false );
  75                         $options = ParserOptions::newFromContext( $this->getContext() );
  76                         $options->setRemoveComments( $this->removeComments );
  77                         $options->setTidy( true );
  78                         $options->setMaxIncludeSize( self::MAX_INCLUDE_SIZE );
  79
  80                         if ( $this->generateXML ) {
  81                                 $wgParser->startExternalParse( $title, $options, Parser::OT_PREPROCESS );
  82                                 $dom = $wgParser->preprocessToDom( $input );
  83
  84                                 if ( method_exists( $dom, 'saveXML' ) ) {
  85                                         $xml = $dom->saveXML();
  86                                 } else {
  87                                         $xml = $dom->__toString();
  88                                 }
  89                         }
  90
  91                         $output = $wgParser->preprocess( $input, $title, $options );
  92                 } else {
  93                         $this->removeComments = $request->getBool( 'wpRemoveComments', true );
  94                         $this->removeNowiki = $request->getBool( 'wpRemoveNowiki', false );
  95                         $output = false;
  96                 }
  97
  98                 $out = $this->getOutput();
  99
 100                 $this->makeForm( $titleStr, $input );
 101
 102                 if ( $output !== false ) {
 103                         if ( $this->generateXML && strlen( $output ) > 0 ) {
 104                                 $out->addHTML( $this->makeOutput( $xml, 'expand_templates_xml_output' ) );
 105                         }
 106
 107                         $tmp = $this->makeOutput( $output );
 108
 109                         if ( $this->removeNowiki ) {
 110                                 $tmp = preg_replace(
 111                                         [ '_&lt;nowiki&gt;_', '_&lt;/nowiki&gt;_', '_&lt;nowiki */&gt;_' ],
 112                                         '',
 113                                         $tmp
 114                                 );
 115                         }
 116
 117                         $config = $this->getConfig();
 118                         if ( MWTidy::isEnabled() && $options->getTidy() ) {
 119                                 $tmp = MWTidy::tidy( $tmp );
 120                         } else {
 121                                 wfDeprecated( 'disabling tidy', '1.33' );
 122                         }
 123
 124                         $out->addHTML( $tmp );
 125
 126                         $pout = $this->generateHtml( $title, $output );
 127                         $rawhtml = $pout->getText();
 128                         if ( $this->generateRawHtml && strlen( $rawhtml ) > 0 ) {
 129                                 $out->addHTML( $this->makeOutput( $rawhtml, 'expand_templates_html_output' ) );
 130                         }
 131
 132                         $this->showHtmlPreview( $title, $pout, $out );
 133                 }
 134         }
 135
 136         /**
 137          * Callback for the HTMLForm used in self::makeForm.
 138          * Checks, if the input was given, and if not, returns a fatal Status
 139          * object with an error message.
 140          *
 141          * @param array $values The values submitted to the HTMLForm
 142          * @return Status
 143          */
 144         public function onSubmitInput( array $values ) {
 145                 $status = Status::newGood();
 146                 if ( !strlen( $values['input'] ) ) {
 147                         $status = Status::newFatal( 'expand_templates_input_missing' );
 148                 }
 149                 return $status;
 150         }
 151
 152         /**
 153          * Generate a form allowing users to enter information
 154          *
 155          * @param string $title Value for context title field
 156          * @param string $input Value for input textbox
 157          */
 158         private function makeForm( $title, $input ) {
 159                 $fields = [
 160                         'contexttitle' => [
 161                                 'type' => 'text',
 162                                 'label' => $this->msg( 'expand_templates_title' )->plain(),
 163                                 'name' => 'wpContextTitle',
 164                                 'id' => 'contexttitle',
 165                                 'size' => 60,
 166                                 'default' => $title,
 167                                 'autofocus' => true,
 168                         ],
 169                         'input' => [
 170                                 'type' => 'textarea',
 171                                 'name' => 'wpInput',
 172                                 'label' => $this->msg( 'expand_templates_input' )->text(),
 173                                 'rows' => 10,
 174                                 'default' => $input,
 175                                 'id' => 'input',
 176                                 'useeditfont' => true,
 177                         ],
 178                         'removecomments' => [
 179                                 'type' => 'check',
 180                                 'label' => $this->msg( 'expand_templates_remove_comments' )->text(),
 181                                 'name' => 'wpRemoveComments',
 182                                 'id' => 'removecomments',
 183                                 'default' => $this->removeComments,
 184                         ],
 185                         'removenowiki' => [
 186                                 'type' => 'check',
 187                                 'label' => $this->msg( 'expand_templates_remove_nowiki' )->text(),
 188                                 'name' => 'wpRemoveNowiki',
 189                                 'id' => 'removenowiki',
 190                                 'default' => $this->removeNowiki,
 191                         ],
 192                         'generate_xml' => [
 193                                 'type' => 'check',
 194                                 'label' => $this->msg( 'expand_templates_generate_xml' )->text(),
 195                                 'name' => 'wpGenerateXml',
 196                                 'id' => 'generate_xml',
 197                                 'default' => $this->generateXML,
 198                         ],
 199                         'generate_rawhtml' => [
 200                                 'type' => 'check',
 201                                 'label' => $this->msg( 'expand_templates_generate_rawhtml' )->text(),
 202                                 'name' => 'wpGenerateRawHtml',
 203                                 'id' => 'generate_rawhtml',
 204                                 'default' => $this->generateRawHtml,
 205                         ],
 206                 ];
 207
 208                 $form = HTMLForm::factory( 'ooui', $fields, $this->getContext() );
 209                 $form
 210                         ->setSubmitTextMsg( 'expand_templates_ok' )
 211                         ->setWrapperLegendMsg( 'expandtemplates' )
 212                         ->setHeaderText( $this->msg( 'expand_templates_intro' )->parse() )
 213                         ->setSubmitCallback( [ $this, 'onSubmitInput' ] )
 214                         ->showAlways();
 215         }
 216
 217         /**
 218          * Generate a nice little box with a heading for output
 219          *
 220          * @param string $output Wiki text output
 221          * @param string $heading
 222          * @return string
 223          */
 224         private function makeOutput( $output, $heading = 'expand_templates_output' ) {
 225                 $out = "<h2>" . $this->msg( $heading )->escaped() . "</h2>\n";
 226                 $out .= Xml::textarea(
 227                         'output',
 228                         $output,
 229                         10,
 230                         10,
 231                         [
 232                                 'id' => 'output',
 233                                 'readonly' => 'readonly',
 234                                 'class' => 'mw-editfont-' . $this->getUser()->getOption( 'editfont' )
 235                         ]
 236                 );
 237
 238                 return $out;
 239         }
 240
 241         /**
 242          * Renders the supplied wikitext as html
 243          *
 244          * @param Title $title
 245          * @param string $text
 246          * @return ParserOutput
 247          */
 248         private function generateHtml( Title $title, $text ) {
 249                 global $wgParser;
 250
 251                 $popts = ParserOptions::newFromContext( $this->getContext() );
 252                 $popts->setTargetLanguage( $title->getPageLanguage() );
 253                 return $wgParser->parse( $text, $title, $popts );
 254         }
 255
 256         /**
 257          * Wraps the provided html code in a div and outputs it to the page
 258          *
 259          * @param Title $title
 260          * @param ParserOutput $pout
 261          * @param OutputPage $out
 262          */
 263         private function showHtmlPreview( Title $title, ParserOutput $pout, OutputPage $out ) {
 264                 $lang = $title->getPageViewLanguage();
 265                 $out->addHTML( "<h2>" . $this->msg( 'expand_templates_preview' )->escaped() . "</h2>\n" );
 266
 267                 if ( $this->getConfig()->get( 'RawHtml' ) ) {
 268                         $request = $this->getRequest();
 269                         $user = $this->getUser();
 270
 271                         // To prevent cross-site scripting attacks, don't show the preview if raw HTML is
 272                         // allowed and a valid edit token is not provided (T73111). However, MediaWiki
 273                         // does not currently provide logged-out users with CSRF protection; in that case,
 274                         // do not show the preview unless anonymous editing is allowed.
 275                         if ( $user->isAnon() && !$user->isAllowed( 'edit' ) ) {
 276                                 $error = [ 'expand_templates_preview_fail_html_anon' ];
 277                         } elseif ( !$user->matchEditToken( $request->getVal( 'wpEditToken' ), '', $request ) ) {
 278                                 $error = [ 'expand_templates_preview_fail_html' ];
 279                         } else {
 280                                 $error = false;
 281                         }
 282
 283                         if ( $error ) {
 284                                 $out->wrapWikiMsg( "<div class='previewnote'>\n$1\n</div>", $error );
 285                                 return;
 286                         }
 287                 }
 288
 289                 $out->addHTML( Html::openElement( 'div', [
 290                         'class' => 'mw-content-' . $lang->getDir(),
 291                         'dir' => $lang->getDir(),
 292                         'lang' => $lang->getHtmlCode(),
 293                 ] ) );
 294                 $out->addParserOutputContent( $pout );
 295                 $out->addHTML( Html::closeElement( 'div' ) );
 296                 $out->setCategoryLinks( $pout->getCategories() );
 297         }
 298
 299         protected function getGroupName() {
 300                 return 'wiki';
 301         }
 302 }