includes/specials/SpecialUserrights.php

   1 <?php
   2 /**
   3  * Implements Special:Userrights
   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 to allow managing user group membership
  26  *
  27  * @ingroup SpecialPage
  28  */
  29 class UserrightsPage extends SpecialPage {
  30         # The target of the local right-adjuster's interest.  Can be gotten from
  31         # either a GET parameter or a subpage-style parameter, so have a member
  32         # variable for it.
  33         protected $mTarget;
  34         protected $isself = false;
  35
  36         public function __construct() {
  37                 parent::__construct( 'Userrights' );
  38         }
  39
  40         public function isRestricted() {
  41                 return true;
  42         }
  43
  44         public function userCanExecute( User $user ) {
  45                 return $this->userCanChangeRights( $user, false );
  46         }
  47
  48         /**
  49          * @param User $user
  50          * @param bool $checkIfSelf
  51          * @return bool
  52          */
  53         public function userCanChangeRights( $user, $checkIfSelf = true ) {
  54                 $available = $this->changeableGroups();
  55                 if ( $user->getId() == 0 ) {
  56                         return false;
  57                 }
  58
  59                 return !empty( $available['add'] )
  60                         || !empty( $available['remove'] )
  61                         || ( ( $this->isself || !$checkIfSelf ) &&
  62                                 ( !empty( $available['add-self'] )
  63                                         || !empty( $available['remove-self'] ) ) );
  64         }
  65
  66         /**
  67          * Manage forms to be shown according to posted data.
  68          * Depending on the submit button used, call a form or a save function.
  69          *
  70          * @param string|null $par String if any subpage provided, else null
  71          * @throws UserBlockedError|PermissionsError
  72          */
  73         public function execute( $par ) {
  74                 // If the visitor doesn't have permissions to assign or remove
  75                 // any groups, it's a bit silly to give them the user search prompt.
  76
  77                 $user = $this->getUser();
  78
  79                 /*
  80                  * If the user is blocked and they only have "partial" access
  81                  * (e.g. they don't have the userrights permission), then don't
  82                  * allow them to use Special:UserRights.
  83                  */
  84                 if ( $user->isBlocked() && !$user->isAllowed( 'userrights' ) ) {
  85                         throw new UserBlockedError( $user->getBlock() );
  86                 }
  87
  88                 $request = $this->getRequest();
  89
  90                 if ( $par !== null ) {
  91                         $this->mTarget = $par;
  92                 } else {
  93                         $this->mTarget = $request->getVal( 'user' );
  94                 }
  95
  96                 $available = $this->changeableGroups();
  97
  98                 if ( $this->mTarget === null ) {
  99                         /*
 100                          * If the user specified no target, and they can only
 101                          * edit their own groups, automatically set them as the
 102                          * target.
 103                          */
 104                         if ( !count( $available['add'] ) && !count( $available['remove'] ) ) {
 105                                 $this->mTarget = $user->getName();
 106                         }
 107                 }
 108
 109                 if ( User::getCanonicalName( $this->mTarget ) === $user->getName() ) {
 110                         $this->isself = true;
 111                 }
 112
 113                 if ( !$this->userCanChangeRights( $user, true ) ) {
 114                         if ( $this->isself && $request->getCheck( 'success' ) ) {
 115                                 // bug 48609: if the user just removed its own rights, this would
 116                                 // leads it in a "permissions error" page. In that case, show a
 117                                 // message that it can't anymore use this page instead of an error
 118                                 $this->setHeaders();
 119                                 $out = $this->getOutput();
 120                                 $out->wrapWikiMsg( "<div class=\"successbox\">\n$1\n</div>", 'userrights-removed-self' );
 121                                 $out->returnToMain();
 122
 123                                 return;
 124                         }
 125
 126                         // @todo FIXME: There may be intermediate groups we can mention.
 127                         $msg = $user->isAnon() ? 'userrights-nologin' : 'userrights-notallowed';
 128                         throw new PermissionsError( null, array( array( $msg ) ) );
 129                 }
 130
 131                 $this->checkReadOnly();
 132
 133                 $this->setHeaders();
 134                 $this->outputHeader();
 135
 136                 $out = $this->getOutput();
 137                 $out->addModuleStyles( 'mediawiki.special' );
 138                 $this->addHelpLink( 'Help:Assigning permissions' );
 139
 140                 // show the general form
 141                 if ( count( $available['add'] ) || count( $available['remove'] ) ) {
 142                         $this->switchForm();
 143                 }
 144
 145                 if (
 146                         $request->wasPosted() &&
 147                         $request->getCheck( 'saveusergroups' ) &&
 148                         $user->matchEditToken( $request->getVal( 'wpEditToken' ), $this->mTarget )
 149                 ) {
 150                         // save settings
 151                         $status = $this->fetchUser( $this->mTarget );
 152                         if ( !$status->isOK() ) {
 153                                 $this->getOutput()->addWikiText( $status->getWikiText() );
 154
 155                                 return;
 156                         }
 157
 158                         $targetUser = $status->value;
 159                         if ( $targetUser instanceof User ) { // UserRightsProxy doesn't have this method (bug 61252)
 160                                 $targetUser->clearInstanceCache(); // bug 38989
 161                         }
 162
 163                         if ( $request->getVal( 'conflictcheck-originalgroups' )
 164                                 !== implode( ',', $targetUser->getGroups() )
 165                         ) {
 166                                 $out->addWikiMsg( 'userrights-conflict' );
 167                         } else {
 168                                 $this->saveUserGroups(
 169                                         $this->mTarget,
 170                                         $request->getVal( 'user-reason' ),
 171                                         $targetUser
 172                                 );
 173
 174                                 $out->redirect( $this->getSuccessURL() );
 175
 176                                 return;
 177                         }
 178                 }
 179
 180                 // show some more forms
 181                 if ( $this->mTarget !== null ) {
 182                         $this->editUserGroupsForm( $this->mTarget );
 183                 }
 184         }
 185
 186         function getSuccessURL() {
 187                 return $this->getPageTitle( $this->mTarget )->getFullURL( array( 'success' => 1 ) );
 188         }
 189
 190         /**
 191          * Save user groups changes in the database.
 192          * Data comes from the editUserGroupsForm() form function
 193          *
 194          * @param string $username Username to apply changes to.
 195          * @param string $reason Reason for group change
 196          * @param User|UserRightsProxy $user Target user object.
 197          * @return null
 198          */
 199         function saveUserGroups( $username, $reason, $user ) {
 200                 $allgroups = $this->getAllGroups();
 201                 $addgroup = array();
 202                 $removegroup = array();
 203
 204                 // This could possibly create a highly unlikely race condition if permissions are changed between
 205                 //  when the form is loaded and when the form is saved. Ignoring it for the moment.
 206                 foreach ( $allgroups as $group ) {
 207                         // We'll tell it to remove all unchecked groups, and add all checked groups.
 208                         // Later on, this gets filtered for what can actually be removed
 209                         if ( $this->getRequest()->getCheck( "wpGroup-$group" ) ) {
 210                                 $addgroup[] = $group;
 211                         } else {
 212                                 $removegroup[] = $group;
 213                         }
 214                 }
 215
 216                 $this->doSaveUserGroups( $user, $addgroup, $removegroup, $reason );
 217         }
 218
 219         /**
 220          * Save user groups changes in the database.
 221          *
 222          * @param User|UserRightsProxy $user
 223          * @param array $add Array of groups to add
 224          * @param array $remove Array of groups to remove
 225          * @param string $reason Reason for group change
 226          * @return array Tuple of added, then removed groups
 227          */
 228         function doSaveUserGroups( $user, $add, $remove, $reason = '' ) {
 229                 global $wgAuth;
 230
 231                 // Validate input set...
 232                 $isself = $user->getName() == $this->getUser()->getName();
 233                 $groups = $user->getGroups();
 234                 $changeable = $this->changeableGroups();
 235                 $addable = array_merge( $changeable['add'], $isself ? $changeable['add-self'] : array() );
 236                 $removable = array_merge( $changeable['remove'], $isself ? $changeable['remove-self'] : array() );
 237
 238                 $remove = array_unique(
 239                         array_intersect( (array)$remove, $removable, $groups ) );
 240                 $add = array_unique( array_diff(
 241                         array_intersect( (array)$add, $addable ),
 242                         $groups )
 243                 );
 244
 245                 $oldGroups = $user->getGroups();
 246                 $newGroups = $oldGroups;
 247
 248                 // Remove then add groups
 249                 if ( $remove ) {
 250                         foreach ( $remove as $index => $group ) {
 251                                 if ( !$user->removeGroup( $group ) ) {
 252                                         unset( $remove[$index] );
 253                                 }
 254                         }
 255                         $newGroups = array_diff( $newGroups, $remove );
 256                 }
 257                 if ( $add ) {
 258                         foreach ( $add as $index => $group ) {
 259                                 if ( !$user->addGroup( $group ) ) {
 260                                         unset( $add[$index] );
 261                                 }
 262                         }
 263                         $newGroups = array_merge( $newGroups, $add );
 264                 }
 265                 $newGroups = array_unique( $newGroups );
 266
 267                 // Ensure that caches are cleared
 268                 $user->invalidateCache();
 269
 270                 // update groups in external authentication database
 271                 $wgAuth->updateExternalDBGroups( $user, $add, $remove );
 272
 273                 wfDebug( 'oldGroups: ' . print_r( $oldGroups, true ) . "\n" );
 274                 wfDebug( 'newGroups: ' . print_r( $newGroups, true ) . "\n" );
 275                 Hooks::run( 'UserRights', array( &$user, $add, $remove ) );
 276
 277                 if ( $newGroups != $oldGroups ) {
 278                         $this->addLogEntry( $user, $oldGroups, $newGroups, $reason );
 279                 }
 280
 281                 return array( $add, $remove );
 282         }
 283
 284         /**
 285          * Add a rights log entry for an action.
 286          * @param User $user
 287          * @param array $oldGroups
 288          * @param array $newGroups
 289          * @param array $reason
 290          */
 291         function addLogEntry( $user, $oldGroups, $newGroups, $reason ) {
 292                 $logEntry = new ManualLogEntry( 'rights', 'rights' );
 293                 $logEntry->setPerformer( $this->getUser() );
 294                 $logEntry->setTarget( $user->getUserPage() );
 295                 $logEntry->setComment( $reason );
 296                 $logEntry->setParameters( array(
 297                         '4::oldgroups' => $oldGroups,
 298                         '5::newgroups' => $newGroups,
 299                 ) );
 300                 $logid = $logEntry->insert();
 301                 $logEntry->publish( $logid );
 302         }
 303
 304         /**
 305          * Edit user groups membership
 306          * @param string $username Name of the user.
 307          */
 308         function editUserGroupsForm( $username ) {
 309                 $status = $this->fetchUser( $username );
 310                 if ( !$status->isOK() ) {
 311                         $this->getOutput()->addWikiText( $status->getWikiText() );
 312
 313                         return;
 314                 } else {
 315                         $user = $status->value;
 316                 }
 317
 318                 $groups = $user->getGroups();
 319
 320                 $this->showEditUserGroupsForm( $user, $groups );
 321
 322                 // This isn't really ideal logging behavior, but let's not hide the
 323                 // interwiki logs if we're using them as is.
 324                 $this->showLogFragment( $user, $this->getOutput() );
 325         }
 326
 327         /**
 328          * Normalize the input username, which may be local or remote, and
 329          * return a user (or proxy) object for manipulating it.
 330          *
 331          * Side effects: error output for invalid access
 332          * @param string $username
 333          * @return Status
 334          */
 335         public function fetchUser( $username ) {
 336                 $parts = explode( $this->getConfig()->get( 'UserrightsInterwikiDelimiter' ), $username );
 337                 if ( count( $parts ) < 2 ) {
 338                         $name = trim( $username );
 339                         $database = '';
 340                 } else {
 341                         list( $name, $database ) = array_map( 'trim', $parts );
 342
 343                         if ( $database == wfWikiID() ) {
 344                                 $database = '';
 345                         } else {
 346                                 if ( !$this->getUser()->isAllowed( 'userrights-interwiki' ) ) {
 347                                         return Status::newFatal( 'userrights-no-interwiki' );
 348                                 }
 349                                 if ( !UserRightsProxy::validDatabase( $database ) ) {
 350                                         return Status::newFatal( 'userrights-nodatabase', $database );
 351                                 }
 352                         }
 353                 }
 354
 355                 if ( $name === '' ) {
 356                         return Status::newFatal( 'nouserspecified' );
 357                 }
 358
 359                 if ( $name[0] == '#' ) {
 360                         // Numeric ID can be specified...
 361                         // We'll do a lookup for the name internally.
 362                         $id = intval( substr( $name, 1 ) );
 363
 364                         if ( $database == '' ) {
 365                                 $name = User::whoIs( $id );
 366                         } else {
 367                                 $name = UserRightsProxy::whoIs( $database, $id );
 368                         }
 369
 370                         if ( !$name ) {
 371                                 return Status::newFatal( 'noname' );
 372                         }
 373                 } else {
 374                         $name = User::getCanonicalName( $name );
 375                         if ( $name === false ) {
 376                                 // invalid name
 377                                 return Status::newFatal( 'nosuchusershort', $username );
 378                         }
 379                 }
 380
 381                 if ( $database == '' ) {
 382                         $user = User::newFromName( $name );
 383                 } else {
 384                         $user = UserRightsProxy::newFromName( $database, $name );
 385                 }
 386
 387                 if ( !$user || $user->isAnon() ) {
 388                         return Status::newFatal( 'nosuchusershort', $username );
 389                 }
 390
 391                 return Status::newGood( $user );
 392         }
 393
 394         function makeGroupNameList( $ids ) {
 395                 if ( empty( $ids ) ) {
 396                         return $this->msg( 'rightsnone' )->inContentLanguage()->text();
 397                 } else {
 398                         return implode( ', ', $ids );
 399                 }
 400         }
 401
 402         /**
 403          * Make a list of group names to be stored as parameter for log entries
 404          *
 405          * @deprecated since 1.21; use LogFormatter instead.
 406          * @param array $ids
 407          * @return string
 408          */
 409         function makeGroupNameListForLog( $ids ) {
 410                 wfDeprecated( __METHOD__, '1.21' );
 411
 412                 if ( empty( $ids ) ) {
 413                         return '';
 414                 } else {
 415                         return $this->makeGroupNameList( $ids );
 416                 }
 417         }
 418
 419         /**
 420          * Output a form to allow searching for a user
 421          */
 422         function switchForm() {
 423                 $this->getOutput()->addModules( 'mediawiki.userSuggest' );
 424
 425                 $this->getOutput()->addHTML(
 426                         Html::openElement(
 427                                 'form',
 428                                 array(
 429                                         'method' => 'get',
 430                                         'action' => wfScript(),
 431                                         'name' => 'uluser',
 432                                         'id' => 'mw-userrights-form1'
 433                                 )
 434                         ) .
 435                         Html::hidden( 'title', $this->getPageTitle()->getPrefixedText() ) .
 436                         Xml::fieldset( $this->msg( 'userrights-lookup-user' )->text() ) .
 437                         Xml::inputLabel(
 438                                 $this->msg( 'userrights-user-editname' )->text(),
 439                                 'user',
 440                                 'username',
 441                                 30,
 442                                 str_replace( '_', ' ', $this->mTarget ),
 443                                 array(
 444                                         'autofocus' => '',
 445                                         'class' => 'mw-autocomplete-user', // used by mediawiki.userSuggest
 446                                 )
 447                         ) . ' ' .
 448                         Xml::submitButton( $this->msg( 'editusergroup' )->text() ) .
 449                         Html::closeElement( 'fieldset' ) .
 450                         Html::closeElement( 'form' ) . "\n"
 451                 );
 452         }
 453
 454         /**
 455          * Go through used and available groups and return the ones that this
 456          * form will be able to manipulate based on the current user's system
 457          * permissions.
 458          *
 459          * @param array $groups List of groups the given user is in
 460          * @return array Tuple of addable, then removable groups
 461          */
 462         protected function splitGroups( $groups ) {
 463                 list( $addable, $removable, $addself, $removeself ) = array_values( $this->changeableGroups() );
 464
 465                 $removable = array_intersect(
 466                         array_merge( $this->isself ? $removeself : array(), $removable ),
 467                         $groups
 468                 ); // Can't remove groups the user doesn't have
 469                 $addable = array_diff(
 470                         array_merge( $this->isself ? $addself : array(), $addable ),
 471                         $groups
 472                 ); // Can't add groups the user does have
 473
 474                 return array( $addable, $removable );
 475         }
 476
 477         /**
 478          * Show the form to edit group memberships.
 479          *
 480          * @param User|UserRightsProxy $user User or UserRightsProxy you're editing
 481          * @param array $groups Array of groups the user is in
 482          */
 483         protected function showEditUserGroupsForm( $user, $groups ) {
 484                 $list = array();
 485                 $membersList = array();
 486                 foreach ( $groups as $group ) {
 487                         $list[] = self::buildGroupLink( $group );
 488                         $membersList[] = self::buildGroupMemberLink( $group );
 489                 }
 490
 491                 $autoList = array();
 492                 $autoMembersList = array();
 493                 if ( $user instanceof User ) {
 494                         foreach ( Autopromote::getAutopromoteGroups( $user ) as $group ) {
 495                                 $autoList[] = self::buildGroupLink( $group );
 496                                 $autoMembersList[] = self::buildGroupMemberLink( $group );
 497                         }
 498                 }
 499
 500                 $language = $this->getLanguage();
 501                 $displayedList = $this->msg( 'userrights-groupsmember-type' )
 502                         ->rawParams(
 503                                 $language->listToText( $list ),
 504                                 $language->listToText( $membersList )
 505                         )->escaped();
 506                 $displayedAutolist = $this->msg( 'userrights-groupsmember-type' )
 507                         ->rawParams(
 508                                 $language->listToText( $autoList ),
 509                                 $language->listToText( $autoMembersList )
 510                         )->escaped();
 511
 512                 $grouplist = '';
 513                 $count = count( $list );
 514                 if ( $count > 0 ) {
 515                         $grouplist = $this->msg( 'userrights-groupsmember' )
 516                                 ->numParams( $count )
 517                                 ->params( $user->getName() )
 518                                 ->parse();
 519                         $grouplist = '<p>' . $grouplist . ' ' . $displayedList . "</p>\n";
 520                 }
 521
 522                 $count = count( $autoList );
 523                 if ( $count > 0 ) {
 524                         $autogrouplistintro = $this->msg( 'userrights-groupsmember-auto' )
 525                                 ->numParams( $count )
 526                                 ->params( $user->getName() )
 527                                 ->parse();
 528                         $grouplist .= '<p>' . $autogrouplistintro . ' ' . $displayedAutolist . "</p>\n";
 529                 }
 530
 531                 $userToolLinks = Linker::userToolLinks(
 532                         $user->getId(),
 533                         $user->getName(),
 534                         false, /* default for redContribsWhenNoEdits */
 535                         Linker::TOOL_LINKS_EMAIL /* Add "send e-mail" link */
 536                 );
 537
 538                 $this->getOutput()->addHTML(
 539                         Xml::openElement(
 540                                 'form',
 541                                 array(
 542                                         'method' => 'post',
 543                                         'action' => $this->getPageTitle()->getLocalURL(),
 544                                         'name' => 'editGroup',
 545                                         'id' => 'mw-userrights-form2'
 546                                 )
 547                         ) .
 548                         Html::hidden( 'user', $this->mTarget ) .
 549                         Html::hidden( 'wpEditToken', $this->getUser()->getEditToken( $this->mTarget ) ) .
 550                         Html::hidden(
 551                                 'conflictcheck-originalgroups',
 552                                 implode( ',', $user->getGroups() )
 553                         ) . // Conflict detection
 554                         Xml::openElement( 'fieldset' ) .
 555                         Xml::element(
 556                                 'legend',
 557                                 array(),
 558                                 $this->msg( 'userrights-editusergroup', $user->getName() )->text()
 559                         ) .
 560                         $this->msg( 'editinguser' )->params( wfEscapeWikiText( $user->getName() ) )
 561                                 ->rawParams( $userToolLinks )->parse() .
 562                         $this->msg( 'userrights-groups-help', $user->getName() )->parse() .
 563                         $grouplist .
 564                         $this->groupCheckboxes( $groups, $user ) .
 565                         Xml::openElement( 'table', array( 'id' => 'mw-userrights-table-outer' ) ) .
 566                                 "<tr>
 567                                         <td class='mw-label'>" .
 568                                                 Xml::label( $this->msg( 'userrights-reason' )->text(), 'wpReason' ) .
 569                                         "</td>
 570                                         <td class='mw-input'>" .
 571                                                 Xml::input( 'user-reason', 60, $this->getRequest()->getVal( 'user-reason', false ),
 572                                                         array( 'id' => 'wpReason', 'maxlength' => 255 ) ) .
 573                                         "</td>
 574                                 </tr>
 575                                 <tr>
 576                                         <td></td>
 577                                         <td class='mw-submit'>" .
 578                                                 Xml::submitButton( $this->msg( 'saveusergroups' )->text(),
 579                                                         array( 'name' => 'saveusergroups' ) +
 580                                                                 Linker::tooltipAndAccesskeyAttribs( 'userrights-set' )
 581                                                 ) .
 582                                         "</td>
 583                                 </tr>" .
 584                         Xml::closeElement( 'table' ) . "\n" .
 585                         Xml::closeElement( 'fieldset' ) .
 586                         Xml::closeElement( 'form' ) . "\n"
 587                 );
 588         }
 589
 590         /**
 591          * Format a link to a group description page
 592          *
 593          * @param string $group
 594          * @return string
 595          */
 596         private static function buildGroupLink( $group ) {
 597                 return User::makeGroupLinkHtml( $group, User::getGroupName( $group ) );
 598         }
 599
 600         /**
 601          * Format a link to a group member description page
 602          *
 603          * @param string $group
 604          * @return string
 605          */
 606         private static function buildGroupMemberLink( $group ) {
 607                 return User::makeGroupLinkHtml( $group, User::getGroupMember( $group ) );
 608         }
 609
 610         /**
 611          * Returns an array of all groups that may be edited
 612          * @return array Array of groups that may be edited.
 613          */
 614         protected static function getAllGroups() {
 615                 return User::getAllGroups();
 616         }
 617
 618         /**
 619          * Adds a table with checkboxes where you can select what groups to add/remove
 620          *
 621          * @todo Just pass the username string?
 622          * @param array $usergroups Groups the user belongs to
 623          * @param User $user
 624          * @return string XHTML table element with checkboxes
 625          */
 626         private function groupCheckboxes( $usergroups, $user ) {
 627                 $allgroups = $this->getAllGroups();
 628                 $ret = '';
 629
 630                 // Put all column info into an associative array so that extensions can
 631                 // more easily manage it.
 632                 $columns = array( 'unchangeable' => array(), 'changeable' => array() );
 633
 634                 foreach ( $allgroups as $group ) {
 635                         $set = in_array( $group, $usergroups );
 636                         // Should the checkbox be disabled?
 637                         $disabled = !(
 638                                 ( $set && $this->canRemove( $group ) ) ||
 639                                 ( !$set && $this->canAdd( $group ) ) );
 640                         // Do we need to point out that this action is irreversible?
 641                         $irreversible = !$disabled && (
 642                                 ( $set && !$this->canAdd( $group ) ) ||
 643                                 ( !$set && !$this->canRemove( $group ) ) );
 644
 645                         $checkbox = array(
 646                                 'set' => $set,
 647                                 'disabled' => $disabled,
 648                                 'irreversible' => $irreversible
 649                         );
 650
 651                         if ( $disabled ) {
 652                                 $columns['unchangeable'][$group] = $checkbox;
 653                         } else {
 654                                 $columns['changeable'][$group] = $checkbox;
 655                         }
 656                 }
 657
 658                 // Build the HTML table
 659                 $ret .= Xml::openElement( 'table', array( 'class' => 'mw-userrights-groups' ) ) .
 660                         "<tr>\n";
 661                 foreach ( $columns as $name => $column ) {
 662                         if ( $column === array() ) {
 663                                 continue;
 664                         }
 665                         // Messages: userrights-changeable-col, userrights-unchangeable-col
 666                         $ret .= Xml::element(
 667                                 'th',
 668                                 null,
 669                                 $this->msg( 'userrights-' . $name . '-col', count( $column ) )->text()
 670                         );
 671                 }
 672
 673                 $ret .= "</tr>\n<tr>\n";
 674                 foreach ( $columns as $column ) {
 675                         if ( $column === array() ) {
 676                                 continue;
 677                         }
 678                         $ret .= "\t<td style='vertical-align:top;'>\n";
 679                         foreach ( $column as $group => $checkbox ) {
 680                                 $attr = $checkbox['disabled'] ? array( 'disabled' => 'disabled' ) : array();
 681
 682                                 $member = User::getGroupMember( $group, $user->getName() );
 683                                 if ( $checkbox['irreversible'] ) {
 684                                         $text = $this->msg( 'userrights-irreversible-marker', $member )->text();
 685                                 } else {
 686                                         $text = $member;
 687                                 }
 688                                 $checkboxHtml = Xml::checkLabel( $text, "wpGroup-" . $group,
 689                                         "wpGroup-" . $group, $checkbox['set'], $attr );
 690                                 $ret .= "\t\t" . ( $checkbox['disabled']
 691                                         ? Xml::tags( 'span', array( 'class' => 'mw-userrights-disabled' ), $checkboxHtml )
 692                                         : $checkboxHtml
 693                                 ) . "<br />\n";
 694                         }
 695                         $ret .= "\t</td>\n";
 696                 }
 697                 $ret .= Xml::closeElement( 'tr' ) . Xml::closeElement( 'table' );
 698
 699                 return $ret;
 700         }
 701
 702         /**
 703          * @param string $group The name of the group to check
 704          * @return bool Can we remove the group?
 705          */
 706         private function canRemove( $group ) {
 707                 // $this->changeableGroups()['remove'] doesn't work, of course. Thanks, PHP.
 708                 $groups = $this->changeableGroups();
 709
 710                 return in_array(
 711                         $group,
 712                         $groups['remove'] ) || ( $this->isself && in_array( $group, $groups['remove-self'] )
 713                 );
 714         }
 715
 716         /**
 717          * @param string $group The name of the group to check
 718          * @return bool Can we add the group?
 719          */
 720         private function canAdd( $group ) {
 721                 $groups = $this->changeableGroups();
 722
 723                 return in_array(
 724                         $group,
 725                         $groups['add'] ) || ( $this->isself && in_array( $group, $groups['add-self'] )
 726                 );
 727         }
 728
 729         /**
 730          * Returns $this->getUser()->changeableGroups()
 731          *
 732          * @return array Array(
 733          *   'add' => array( addablegroups ),
 734          *   'remove' => array( removablegroups ),
 735          *   'add-self' => array( addablegroups to self ),
 736          *   'remove-self' => array( removable groups from self )
 737          *  )
 738          */
 739         function changeableGroups() {
 740                 return $this->getUser()->changeableGroups();
 741         }
 742
 743         /**
 744          * Show a rights log fragment for the specified user
 745          *
 746          * @param User $user User to show log for
 747          * @param OutputPage $output OutputPage to use
 748          */
 749         protected function showLogFragment( $user, $output ) {
 750                 $rightsLogPage = new LogPage( 'rights' );
 751                 $output->addHTML( Xml::element( 'h2', null, $rightsLogPage->getName()->text() ) );
 752                 LogEventsList::showLogExtract( $output, 'rights', $user->getUserPage() );
 753         }
 754
 755         protected function getGroupName() {
 756                 return 'users';
 757         }
 758 }