includes/ProtectionForm.php

   1 <?php
   2 /**
   3  * Page protection
   4  *
   5  * Copyright © 2005 Brion Vibber <brion@pobox.com>
   6  * http://www.mediawiki.org/
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with this program; if not, write to the Free Software Foundation, Inc.,
  20  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  21  * http://www.gnu.org/copyleft/gpl.html
  22  *
  23  * @file
  24  */
  25
  26 /**
  27  * Handles the page protection UI and backend
  28  */
  29 class ProtectionForm {
  30         /** A map of action to restriction level, from request or default */
  31         var $mRestrictions = array();
  32
  33         /** The custom/additional protection reason */
  34         var $mReason = '';
  35
  36         /** The reason selected from the list, blank for other/additional */
  37         var $mReasonSelection = '';
  38
  39         /** True if the restrictions are cascading, from request or existing protection */
  40         var $mCascade = false;
  41
  42         /** Map of action to "other" expiry time. Used in preference to mExpirySelection. */
  43         var $mExpiry = array();
  44
  45         /**
  46          * Map of action to value selected in expiry drop-down list.
  47          * Will be set to 'othertime' whenever mExpiry is set.
  48          */
  49         var $mExpirySelection = array();
  50
  51         /** Permissions errors for the protect action */
  52         var $mPermErrors = array();
  53
  54         /** Types (i.e. actions) for which levels can be selected */
  55         var $mApplicableTypes = array();
  56
  57         /** Map of action to the expiry time of the existing protection */
  58         var $mExistingExpiry = array();
  59
  60         function __construct( Page $article ) {
  61                 global $wgUser;
  62                 // Set instance variables.
  63                 $this->mArticle = $article;
  64                 $this->mTitle = $article->getTitle();
  65                 $this->mApplicableTypes = $this->mTitle->getRestrictionTypes();
  66
  67                 // Check if the form should be disabled.
  68                 // If it is, the form will be available in read-only to show levels.
  69                 $this->mPermErrors = $this->mTitle->getUserPermissionsErrors( 'protect', $wgUser );
  70                 if ( wfReadOnly() ) {
  71                         $this->mPermErrors[] = array( 'readonlytext', wfReadOnlyReason() );
  72                 }
  73                 $this->disabled = $this->mPermErrors != array();
  74                 $this->disabledAttrib = $this->disabled
  75                         ? array( 'disabled' => 'disabled' )
  76                         : array();
  77
  78                 $this->loadData();
  79         }
  80
  81         /**
  82          * Loads the current state of protection into the object.
  83          */
  84         function loadData() {
  85                 global $wgRequest, $wgUser;
  86                 global $wgRestrictionLevels;
  87
  88                 $this->mCascade = $this->mTitle->areRestrictionsCascading();
  89
  90                 $this->mReason = $wgRequest->getText( 'mwProtect-reason' );
  91                 $this->mReasonSelection = $wgRequest->getText( 'wpProtectReasonSelection' );
  92                 $this->mCascade = $wgRequest->getBool( 'mwProtect-cascade', $this->mCascade );
  93
  94                 foreach( $this->mApplicableTypes as $action ) {
  95                         // @todo FIXME: This form currently requires individual selections,
  96                         // but the db allows multiples separated by commas.
  97
  98                         // Pull the actual restriction from the DB
  99                         $this->mRestrictions[$action] = implode( '', $this->mTitle->getRestrictions( $action ) );
 100
 101                         if ( !$this->mRestrictions[$action] ) {
 102                                 // No existing expiry
 103                                 $existingExpiry = '';
 104                         } else {
 105                                 $existingExpiry = $this->mTitle->getRestrictionExpiry( $action );
 106                         }
 107                         $this->mExistingExpiry[$action] = $existingExpiry;
 108
 109                         $requestExpiry = $wgRequest->getText( "mwProtect-expiry-$action" );
 110                         $requestExpirySelection = $wgRequest->getVal( "wpProtectExpirySelection-$action" );
 111
 112                         if ( $requestExpiry ) {
 113                                 // Custom expiry takes precedence
 114                                 $this->mExpiry[$action] = $requestExpiry;
 115                                 $this->mExpirySelection[$action] = 'othertime';
 116                         } elseif ( $requestExpirySelection ) {
 117                                 // Expiry selected from list
 118                                 $this->mExpiry[$action] = '';
 119                                 $this->mExpirySelection[$action] = $requestExpirySelection;
 120                         } elseif ( $existingExpiry == 'infinity' ) {
 121                                 // Existing expiry is infinite, use "infinite" in drop-down
 122                                 $this->mExpiry[$action] = '';
 123                                 $this->mExpirySelection[$action] = 'infinite';
 124                         } elseif ( $existingExpiry ) {
 125                                 // Use existing expiry in its own list item
 126                                 $this->mExpiry[$action] = '';
 127                                 $this->mExpirySelection[$action] = $existingExpiry;
 128                         } else {
 129                                 // Final default: infinite
 130                                 $this->mExpiry[$action] = '';
 131                                 $this->mExpirySelection[$action] = 'infinite';
 132                         }
 133
 134                         $val = $wgRequest->getVal( "mwProtect-level-$action" );
 135                         if( isset( $val ) && in_array( $val, $wgRestrictionLevels ) ) {
 136                                 // Prevent users from setting levels that they cannot later unset
 137                                 if( $val == 'sysop' ) {
 138                                         // Special case, rewrite sysop to either protect and editprotected
 139                                         if( !$wgUser->isAllowedAny( 'protect', 'editprotected' ) )
 140                                                 continue;
 141                                 } else {
 142                                         if( !$wgUser->isAllowed($val) )
 143                                                 continue;
 144                                 }
 145                                 $this->mRestrictions[$action] = $val;
 146                         }
 147                 }
 148         }
 149
 150         /**
 151          * Get the expiry time for a given action, by combining the relevant inputs.
 152          *
 153          * @param $action string
 154          *
 155          * @return string 14-char timestamp or "infinity", or false if the input was invalid
 156          */
 157         function getExpiry( $action ) {
 158                 if ( $this->mExpirySelection[$action] == 'existing' ) {
 159                         return $this->mExistingExpiry[$action];
 160                 } elseif ( $this->mExpirySelection[$action] == 'othertime' ) {
 161                         $value = $this->mExpiry[$action];
 162                 } else {
 163                         $value = $this->mExpirySelection[$action];
 164                 }
 165                 if ( $value == 'infinite' || $value == 'indefinite' || $value == 'infinity' ) {
 166                         $time = wfGetDB( DB_SLAVE )->getInfinity();
 167                 } else {
 168                         $unix = strtotime( $value );
 169
 170                         if ( !$unix || $unix === -1 ) {
 171                                 return false;
 172                         }
 173
 174                         // @todo FIXME: Non-qualified absolute times are not in users specified timezone
 175                         // and there isn't notice about it in the ui
 176                         $time = wfTimestamp( TS_MW, $unix );
 177                 }
 178                 return $time;
 179         }
 180
 181         /**
 182          * Main entry point for action=protect and action=unprotect
 183          */
 184         function execute() {
 185                 global $wgRequest, $wgOut;
 186
 187                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 188                         throw new ErrorPageError( 'protect-badnamespace-title', 'protect-badnamespace-text' );
 189                 }
 190
 191                 if( $wgRequest->wasPosted() ) {
 192                         if( $this->save() ) {
 193                                 $q = $this->mArticle->isRedirect() ? 'redirect=no' : '';
 194                                 $wgOut->redirect( $this->mTitle->getFullUrl( $q ) );
 195                         }
 196                 } else {
 197                         $this->show();
 198                 }
 199         }
 200
 201         /**
 202          * Show the input form with optional error message
 203          *
 204          * @param $err String: error message or null if there's no error
 205          */
 206         function show( $err = null ) {
 207                 global $wgOut;
 208
 209                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
 210
 211                 if ( is_array( $err ) ) {
 212                         $wgOut->wrapWikiMsg( "<p class='error'>\n$1\n</p>\n", $err );
 213                 } elseif ( is_string( $err ) ) {
 214                         $wgOut->addHTML( "<p class='error'>{$err}</p>\n" );
 215                 }
 216
 217                 list( $cascadeSources, /* $restrictions */ ) = $this->mTitle->getCascadeProtectionSources();
 218                 if ( $cascadeSources && count($cascadeSources) > 0 ) {
 219                         $titles = '';
 220
 221                         foreach ( $cascadeSources as $title ) {
 222                                 $titles .= '* [[:' . $title->getPrefixedText() . "]]\n";
 223                         }
 224
 225                         $wgOut->wrapWikiMsg( "<div id=\"mw-protect-cascadeon\">\n$1\n" . $titles . "</div>", array( 'protect-cascadeon', count($cascadeSources) ) );
 226                 }
 227
 228                 # Show an appropriate message if the user isn't allowed or able to change
 229                 # the protection settings at this time
 230                 if ( $this->disabled ) {
 231                         $wgOut->setPageTitle( wfMessage( 'protect-title-notallowed', $this->mTitle->getPrefixedText() ) );
 232                         $wgOut->addWikiText( $wgOut->formatPermissionsErrorMessage( $this->mPermErrors, 'protect' ) );
 233                 } else {
 234                         $wgOut->setPageTitle( wfMessage( 'protect-title', $this->mTitle->getPrefixedText() ) );
 235                         $wgOut->addWikiMsg( 'protect-text',
 236                                 wfEscapeWikiText( $this->mTitle->getPrefixedText() ) );
 237                 }
 238
 239                 $wgOut->addBacklinkSubtitle( $this->mTitle );
 240                 $wgOut->addHTML( $this->buildForm() );
 241                 $this->showLogExtract( $wgOut );
 242         }
 243
 244         /**
 245          * Save submitted protection form
 246          *
 247          * @return Boolean: success
 248          */
 249         function save() {
 250                 global $wgRequest, $wgUser, $wgOut;
 251
 252                 # Permission check!
 253                 if ( $this->disabled ) {
 254                         $this->show();
 255                         return false;
 256                 }
 257
 258                 $token = $wgRequest->getVal( 'wpEditToken' );
 259                 if ( !$wgUser->matchEditToken( $token, array( 'protect', $this->mTitle->getPrefixedDBkey() ) ) ) {
 260                         $this->show( array( 'sessionfailure' ) );
 261                         return false;
 262                 }
 263
 264                 # Create reason string. Use list and/or custom string.
 265                 $reasonstr = $this->mReasonSelection;
 266                 if ( $reasonstr != 'other' && $this->mReason != '' ) {
 267                         // Entry from drop down menu + additional comment
 268                         $reasonstr .= wfMsgForContent( 'colon-separator' ) . $this->mReason;
 269                 } elseif ( $reasonstr == 'other' ) {
 270                         $reasonstr = $this->mReason;
 271                 }
 272                 $expiry = array();
 273                 foreach( $this->mApplicableTypes as $action ) {
 274                         $expiry[$action] = $this->getExpiry( $action );
 275                         if( empty($this->mRestrictions[$action]) )
 276                                 continue; // unprotected
 277                         if ( !$expiry[$action] ) {
 278                                 $this->show( array( 'protect_expiry_invalid' ) );
 279                                 return false;
 280                         }
 281                         if ( $expiry[$action] < wfTimestampNow() ) {
 282                                 $this->show( array( 'protect_expiry_old' ) );
 283                                 return false;
 284                         }
 285                 }
 286
 287                 # They shouldn't be able to do this anyway, but just to make sure, ensure that cascading restrictions aren't being applied
 288                 #  to a semi-protected page.
 289                 global $wgGroupPermissions;
 290
 291                 $edit_restriction = isset( $this->mRestrictions['edit'] ) ? $this->mRestrictions['edit'] : '';
 292                 $this->mCascade = $wgRequest->getBool( 'mwProtect-cascade' );
 293                 if ($this->mCascade && ($edit_restriction != 'protect') &&
 294                         !(isset($wgGroupPermissions[$edit_restriction]['protect']) && $wgGroupPermissions[$edit_restriction]['protect'] ) )
 295                         $this->mCascade = false;
 296
 297                 $status = $this->mArticle->doUpdateRestrictions( $this->mRestrictions, $expiry, $this->mCascade, $reasonstr, $wgUser );
 298
 299                 if ( !$status->isOK() ) {
 300                         $this->show( $wgOut->parseInline( $status->getWikiText() ) );
 301                         return false;
 302                 }
 303
 304                 /**
 305                  * Give extensions a change to handle added form items
 306                  *
 307                  * @since 1.19 you can (and you should) return false to abort saving;
 308                  *             you can also return an array of message name and its parameters
 309                  */
 310                 $errorMsg = '';
 311                 if( !wfRunHooks( 'ProtectionForm::save', array( $this->mArticle, &$errorMsg ) ) ) {
 312                         if ( $errorMsg == '' ) {
 313                                 $errorMsg = array( 'hookaborted' );
 314                         }
 315                 }
 316                 if( $errorMsg != '' ) {
 317                         $this->show( $errorMsg );
 318                         return false;
 319                 }
 320
 321                 if ( $wgRequest->getCheck( 'mwProtectWatch' ) && $wgUser->isLoggedIn() ) {
 322                         WatchAction::doWatch( $this->mTitle, $wgUser );
 323                 } elseif ( $this->mTitle->userIsWatching() ) {
 324                         WatchAction::doUnwatch( $this->mTitle, $wgUser );
 325                 }
 326                 return true;
 327         }
 328
 329         /**
 330          * Build the input form
 331          *
 332          * @return String: HTML form
 333          */
 334         function buildForm() {
 335                 global $wgUser, $wgLang, $wgOut;
 336
 337                 $mProtectreasonother = Xml::label( wfMsg( 'protectcomment' ), 'wpProtectReasonSelection' );
 338                 $mProtectreason = Xml::label( wfMsg( 'protect-otherreason' ), 'mwProtect-reason' );
 339
 340                 $out = '';
 341                 if( !$this->disabled ) {
 342                         $wgOut->addModules( 'mediawiki.legacy.protect' );
 343                         $out .= Xml::openElement( 'form', array( 'method' => 'post',
 344                                 'action' => $this->mTitle->getLocalUrl( 'action=protect' ),
 345                                 'id' => 'mw-Protect-Form', 'onsubmit' => 'ProtectionForm.enableUnchainedInputs(true)' ) );
 346                 }
 347
 348                 $out .= Xml::openElement( 'fieldset' ) .
 349                         Xml::element( 'legend', null, wfMsg( 'protect-legend' ) ) .
 350                         Xml::openElement( 'table', array( 'id' => 'mwProtectSet' ) ) .
 351                         Xml::openElement( 'tbody' );
 352
 353                 foreach( $this->mRestrictions as $action => $selected ) {
 354                         /* Not all languages have V_x <-> N_x relation */
 355                         $msg = wfMessage( 'restriction-' . $action );
 356                         $out .= "<tr><td>".
 357                         Xml::openElement( 'fieldset' ) .
 358                         Xml::element( 'legend', null, $msg->exists() ? $msg->text() : $action ) .
 359                         Xml::openElement( 'table', array( 'id' => "mw-protect-table-$action" ) ) .
 360                                 "<tr><td>" . $this->buildSelector( $action, $selected ) . "</td></tr><tr><td>";
 361
 362                         $reasonDropDown = Xml::listDropDown( 'wpProtectReasonSelection',
 363                                 wfMsgForContent( 'protect-dropdown' ),
 364                                 wfMsgForContent( 'protect-otherreason-op' ),
 365                                 $this->mReasonSelection,
 366                                 'mwProtect-reason', 4 );
 367                         $scExpiryOptions = wfMsgForContent( 'protect-expiry-options' );
 368
 369                         $showProtectOptions = ($scExpiryOptions !== '-' && !$this->disabled);
 370
 371                         $mProtectexpiry = Xml::label( wfMsg( 'protectexpiry' ), "mwProtectExpirySelection-$action" );
 372                         $mProtectother = Xml::label( wfMsg( 'protect-othertime' ), "mwProtect-$action-expires" );
 373
 374                         $expiryFormOptions = '';
 375                         if ( $this->mExistingExpiry[$action] && $this->mExistingExpiry[$action] != 'infinity' ) {
 376                                 $timestamp = $wgLang->timeanddate( $this->mExistingExpiry[$action], true );
 377                                 $d = $wgLang->date( $this->mExistingExpiry[$action], true );
 378                                 $t = $wgLang->time( $this->mExistingExpiry[$action], true );
 379                                 $expiryFormOptions .=
 380                                         Xml::option(
 381                                                 wfMsg( 'protect-existing-expiry', $timestamp, $d, $t ),
 382                                                 'existing',
 383                                                 $this->mExpirySelection[$action] == 'existing'
 384                                         ) . "\n";
 385                         }
 386
 387                         $expiryFormOptions .= Xml::option( wfMsg( 'protect-othertime-op' ), "othertime" ) . "\n";
 388                         foreach( explode(',', $scExpiryOptions) as $option ) {
 389                                 if ( strpos($option, ":") === false ) {
 390                                         $show = $value = $option;
 391                                 } else {
 392                                         list($show, $value) = explode(":", $option);
 393                                 }
 394                                 $show = htmlspecialchars($show);
 395                                 $value = htmlspecialchars($value);
 396                                 $expiryFormOptions .= Xml::option( $show, $value, $this->mExpirySelection[$action] === $value ) . "\n";
 397                         }
 398                         # Add expiry dropdown
 399                         if( $showProtectOptions && !$this->disabled ) {
 400                                 $out .= "
 401                                         <table><tr>
 402                                                 <td class='mw-label'>
 403                                                         {$mProtectexpiry}
 404                                                 </td>
 405                                                 <td class='mw-input'>" .
 406                                                         Xml::tags( 'select',
 407                                                                 array(
 408                                                                         'id' => "mwProtectExpirySelection-$action",
 409                                                                         'name' => "wpProtectExpirySelection-$action",
 410                                                                         'onchange' => "ProtectionForm.updateExpiryList(this)",
 411                                                                         'tabindex' => '2' ) + $this->disabledAttrib,
 412                                                                 $expiryFormOptions ) .
 413                                                 "</td>
 414                                         </tr></table>";
 415                         }
 416                         # Add custom expiry field
 417                         $attribs = array( 'id' => "mwProtect-$action-expires",
 418                                 'onkeyup' => 'ProtectionForm.updateExpiry(this)',
 419                                 'onchange' => 'ProtectionForm.updateExpiry(this)' ) + $this->disabledAttrib;
 420                         $out .= "<table><tr>
 421                                         <td class='mw-label'>" .
 422                                                 $mProtectother .
 423                                         '</td>
 424                                         <td class="mw-input">' .
 425                                                 Xml::input( "mwProtect-expiry-$action", 50, $this->mExpiry[$action], $attribs ) .
 426                                         '</td>
 427                                 </tr></table>';
 428                         $out .= "</td></tr>" .
 429                         Xml::closeElement( 'table' ) .
 430                         Xml::closeElement( 'fieldset' ) .
 431                         "</td></tr>";
 432                 }
 433                 # Give extensions a chance to add items to the form
 434                 wfRunHooks( 'ProtectionForm::buildForm', array($this->mArticle,&$out) );
 435
 436                 $out .= Xml::closeElement( 'tbody' ) . Xml::closeElement( 'table' );
 437
 438                 // JavaScript will add another row with a value-chaining checkbox
 439                 if( $this->mTitle->exists() ) {
 440                         $out .= Xml::openElement( 'table', array( 'id' => 'mw-protect-table2' ) ) .
 441                                 Xml::openElement( 'tbody' );
 442                         $out .= '<tr>
 443                                         <td></td>
 444                                         <td class="mw-input">' .
 445                                                 Xml::checkLabel( wfMsg( 'protect-cascade' ), 'mwProtect-cascade', 'mwProtect-cascade',
 446                                                         $this->mCascade, $this->disabledAttrib ) .
 447                                         "</td>
 448                                 </tr>\n";
 449                         $out .= Xml::closeElement( 'tbody' ) . Xml::closeElement( 'table' );
 450                 }
 451
 452                 # Add manual and custom reason field/selects as well as submit
 453                 if( !$this->disabled ) {
 454                         $out .=  Xml::openElement( 'table', array( 'id' => 'mw-protect-table3' ) ) .
 455                                 Xml::openElement( 'tbody' );
 456                         $out .= "
 457                                 <tr>
 458                                         <td class='mw-label'>
 459                                                 {$mProtectreasonother}
 460                                         </td>
 461                                         <td class='mw-input'>
 462                                                 {$reasonDropDown}
 463                                         </td>
 464                                 </tr>
 465                                 <tr>
 466                                         <td class='mw-label'>
 467                                                 {$mProtectreason}
 468                                         </td>
 469                                         <td class='mw-input'>" .
 470                                                 Xml::input( 'mwProtect-reason', 60, $this->mReason, array( 'type' => 'text',
 471                                                         'id' => 'mwProtect-reason', 'maxlength' => 180 ) ) .
 472                                                         // Limited maxlength as the database trims at 255 bytes and other texts
 473                                                         // chosen by dropdown menus on this page are also included in this database field.
 474                                                         // The byte limit of 180 bytes is enforced in javascript
 475                                         "</td>
 476                                 </tr>";
 477                         # Disallow watching is user is not logged in
 478                         if( $wgUser->isLoggedIn() ) {
 479                                 $out .= "
 480                                 <tr>
 481                                         <td></td>
 482                                         <td class='mw-input'>" .
 483                                                 Xml::checkLabel( wfMsg( 'watchthis' ),
 484                                                         'mwProtectWatch', 'mwProtectWatch',
 485                                                         $this->mTitle->userIsWatching() || $wgUser->getOption( 'watchdefault' ) ) .
 486                                         "</td>
 487                                 </tr>";
 488                         }
 489                         $out .= "
 490                                 <tr>
 491                                         <td></td>
 492                                         <td class='mw-submit'>" .
 493                                                 Xml::submitButton( wfMsg( 'confirm' ), array( 'id' => 'mw-Protect-submit' ) ) .
 494                                         "</td>
 495                                 </tr>\n";
 496                         $out .= Xml::closeElement( 'tbody' ) . Xml::closeElement( 'table' );
 497                 }
 498                 $out .= Xml::closeElement( 'fieldset' );
 499
 500                 if ( $wgUser->isAllowed( 'editinterface' ) ) {
 501                         $title = Title::makeTitle( NS_MEDIAWIKI, 'Protect-dropdown' );
 502                         $link = Linker::link(
 503                                 $title,
 504                                 wfMsgHtml( 'protect-edit-reasonlist' ),
 505                                 array(),
 506                                 array( 'action' => 'edit' )
 507                         );
 508                         $out .= '<p class="mw-protect-editreasons">' . $link . '</p>';
 509                 }
 510
 511                 if ( !$this->disabled ) {
 512                         $out .= Html::hidden( 'wpEditToken', $wgUser->getEditToken( array( 'protect', $this->mTitle->getPrefixedDBkey() ) ) );
 513                         $out .= Xml::closeElement( 'form' );
 514                         $wgOut->addScript( $this->buildCleanupScript() );
 515                 }
 516
 517                 return $out;
 518         }
 519
 520         /**
 521          * Build protection level selector
 522          *
 523          * @param $action String: action to protect
 524          * @param $selected String: current protection level
 525          * @return String: HTML fragment
 526          */
 527         function buildSelector( $action, $selected ) {
 528                 global $wgRestrictionLevels, $wgUser;
 529
 530                 $levels = array();
 531                 foreach( $wgRestrictionLevels as $key ) {
 532                         //don't let them choose levels above their own (aka so they can still unprotect and edit the page). but only when the form isn't disabled
 533                         if( $key == 'sysop' ) {
 534                                 //special case, rewrite sysop to protect and editprotected
 535                                 if( !$wgUser->isAllowedAny( 'protect', 'editprotected' ) && !$this->disabled )
 536                                         continue;
 537                         } else {
 538                                 if( !$wgUser->isAllowed($key) && !$this->disabled )
 539                                         continue;
 540                         }
 541                         $levels[] = $key;
 542                 }
 543
 544                 $id = 'mwProtect-level-' . $action;
 545                 $attribs = array(
 546                         'id' => $id,
 547                         'name' => $id,
 548                         'size' => count( $levels ),
 549                         'onchange' => 'ProtectionForm.updateLevels(this)',
 550                         ) + $this->disabledAttrib;
 551
 552                 $out = Xml::openElement( 'select', $attribs );
 553                 foreach( $levels as $key ) {
 554                         $out .= Xml::option( $this->getOptionLabel( $key ), $key, $key == $selected );
 555                 }
 556                 $out .= Xml::closeElement( 'select' );
 557                 return $out;
 558         }
 559
 560         /**
 561          * Prepare the label for a protection selector option
 562          *
 563          * @param $permission String: permission required
 564          * @return String
 565          */
 566         private function getOptionLabel( $permission ) {
 567                 if( $permission == '' ) {
 568                         return wfMsg( 'protect-default' );
 569                 } else {
 570                         $msg = wfMessage( "protect-level-{$permission}" );
 571                         if( $msg->exists() ) {
 572                                 return $msg->text();
 573                         }
 574                         return wfMsg( 'protect-fallback', $permission );
 575                 }
 576         }
 577
 578         function buildCleanupScript() {
 579                 global $wgRestrictionLevels, $wgGroupPermissions, $wgOut;
 580
 581                 $cascadeableLevels = array();
 582                 foreach( $wgRestrictionLevels as $key ) {
 583                         if ( ( isset( $wgGroupPermissions[$key]['protect'] ) && $wgGroupPermissions[$key]['protect'] )
 584                                 || $key == 'protect'
 585                         ) {
 586                                 $cascadeableLevels[] = $key;
 587                         }
 588                 }
 589                 $options = array(
 590                         'tableId' => 'mwProtectSet',
 591                         'labelText' => wfMessage( 'protect-unchain-permissions' )->plain(),
 592                         'numTypes' => count( $this->mApplicableTypes ),
 593                         'existingMatch' => count( array_unique( $this->mExistingExpiry ) ) === 1,
 594                 );
 595
 596                 $wgOut->addJsConfigVars( 'wgCascadeableLevels', $cascadeableLevels );
 597                 $script = Xml::encodeJsCall( 'ProtectionForm.init', array( $options ) );
 598                 return Html::inlineScript( ResourceLoader::makeLoaderConditionalScript( $script ) );
 599         }
 600
 601         /**
 602          * Show protection long extracts for this page
 603          *
 604          * @param $out OutputPage
 605          * @access private
 606          */
 607         function showLogExtract( &$out ) {
 608                 # Show relevant lines from the protection log:
 609                 $out->addHTML( Xml::element( 'h2', null, LogPage::logName( 'protect' ) ) );
 610                 LogEventsList::showLogExtract( $out, 'protect', $this->mTitle );
 611                 # Let extensions add other relevant log extracts
 612                 wfRunHooks( 'ProtectionForm::showLogExtract', array($this->mArticle,$out) );
 613         }
 614 }