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         /*
  35          * @var null|User $mFetchedUser The user object of the target username or null.
  36          */
  37         protected $mFetchedUser = null;
  38         protected $isself = false;
  39
  40         public function __construct() {
  41                 parent::__construct( 'Userrights' );
  42         }
  43
  44         public function isRestricted() {
  45                 return true;
  46         }
  47
  48         public function userCanExecute( User $user ) {
  49                 return $this->userCanChangeRights( $user, false );
  50         }
  51
  52         /**
  53          * @param User $user
  54          * @param bool $checkIfSelf
  55          * @return bool
  56          */
  57         public function userCanChangeRights( $user, $checkIfSelf = true ) {
  58                 $available = $this->changeableGroups();
  59                 if ( $user->getId() == 0 ) {
  60                         return false;
  61                 }
  62
  63                 return !empty( $available['add'] )
  64                         || !empty( $available['remove'] )
  65                         || ( ( $this->isself || !$checkIfSelf ) &&
  66                                 ( !empty( $available['add-self'] )
  67                                         || !empty( $available['remove-self'] ) ) );
  68         }
  69
  70         /**
  71          * Manage forms to be shown according to posted data.
  72          * Depending on the submit button used, call a form or a save function.
  73          *
  74          * @param string|null $par String if any subpage provided, else null
  75          * @throws UserBlockedError|PermissionsError
  76          */
  77         public function execute( $par ) {
  78                 // If the visitor doesn't have permissions to assign or remove
  79                 // any groups, it's a bit silly to give them the user search prompt.
  80
  81                 $user = $this->getUser();
  82                 $request = $this->getRequest();
  83                 $out = $this->getOutput();
  84
  85                 /*
  86                  * If the user is blocked and they only have "partial" access
  87                  * (e.g. they don't have the userrights permission), then don't
  88                  * allow them to use Special:UserRights.
  89                  */
  90                 if ( $user->isBlocked() && !$user->isAllowed( 'userrights' ) ) {
  91                         throw new UserBlockedError( $user->getBlock() );
  92                 }
  93
  94                 if ( $par !== null ) {
  95                         $this->mTarget = $par;
  96                 } else {
  97                         $this->mTarget = $request->getVal( 'user' );
  98                 }
  99
 100                 $available = $this->changeableGroups();
 101
 102                 if ( $this->mTarget === null ) {
 103                         /*
 104                          * If the user specified no target, and they can only
 105                          * edit their own groups, automatically set them as the
 106                          * target.
 107                          */
 108                         if ( !count( $available['add'] ) && !count( $available['remove'] ) ) {
 109                                 $this->mTarget = $user->getName();
 110                         }
 111                 }
 112
 113                 if ( $this->mTarget !== null && User::getCanonicalName( $this->mTarget ) === $user->getName() ) {
 114                         $this->isself = true;
 115                 }
 116
 117                 $fetchedStatus = $this->fetchUser( $this->mTarget );
 118                 if ( $fetchedStatus->isOk() ) {
 119                         $this->mFetchedUser = $fetchedStatus->value;
 120                 }
 121
 122                 if ( !$this->userCanChangeRights( $user, true ) ) {
 123                         if ( $this->isself && $request->getCheck( 'success' ) ) {
 124                                 // bug 48609: if the user just removed its own rights, this would
 125                                 // leads it in a "permissions error" page. In that case, show a
 126                                 // message that it can't anymore use this page instead of an error
 127                                 $this->setHeaders();
 128                                 $out->wrapWikiMsg( "<div class=\"successbox\">\n$1\n</div>", 'userrights-removed-self' );
 129                                 $out->returnToMain();
 130
 131                                 return;
 132                         }
 133
 134                         // @todo FIXME: There may be intermediate groups we can mention.
 135                         $msg = $user->isAnon() ? 'userrights-nologin' : 'userrights-notallowed';
 136                         throw new PermissionsError( null, array( array( $msg ) ) );
 137                 }
 138
 139                 // show a successbox, if the user rights was saved successfully
 140                 if ( $request->getCheck( 'success' ) && $this->mFetchedUser !== null ) {
 141                         $out->wrapWikiMsg(
 142                                 "<div class=\"successbox\">\n$1\n</div>",
 143                                 array( 'savedrights', $this->mFetchedUser->getName() )
 144                         );
 145                 }
 146
 147                 $this->checkReadOnly();
 148
 149                 $this->setHeaders();
 150                 $this->outputHeader();
 151
 152                 $out->addModuleStyles( 'mediawiki.special' );
 153                 $this->addHelpLink( 'Help:Assigning permissions' );
 154
 155                 // show the general form
 156                 if ( count( $available['add'] ) || count( $available['remove'] ) ) {
 157                         $this->switchForm();
 158                 }
 159
 160                 if (
 161                         $request->wasPosted() &&
 162                         $request->getCheck( 'saveusergroups' ) &&
 163                         $this->mTarget !== null &&
 164                         $user->matchEditToken( $request->getVal( 'wpEditToken' ), $this->mTarget )
 165                 ) {
 166                         // save settings
 167                         if ( !$fetchedStatus->isOK() ) {
 168                                 $this->getOutput()->addWikiText( $fetchedStatus->getWikiText() );
 169
 170                                 return;
 171                         }
 172
 173                         $targetUser = $this->mFetchedUser;
 174                         if ( $targetUser instanceof User ) { // UserRightsProxy doesn't have this method (bug 61252)
 175                                 $targetUser->clearInstanceCache(); // bug 38989
 176                         }
 177
 178                         if ( $request->getVal( 'conflictcheck-originalgroups' )
 179                                 !== implode( ',', $targetUser->getGroups() )
 180                         ) {
 181                                 $out->addWikiMsg( 'userrights-conflict' );
 182                         } else {
 183                                 $this->saveUserGroups(
 184                                         $this->mTarget,
 185                                         $request->getVal( 'user-reason' ),
 186                                         $targetUser
 187                                 );
 188
 189                                 $out->redirect( $this->getSuccessURL() );
 190
 191                                 return;
 192                         }
 193                 }
 194
 195                 // show some more forms
 196                 if ( $this->mTarget !== null ) {
 197                         $this->editUserGroupsForm( $this->mTarget );
 198                 }
 199         }
 200
 201         function getSuccessURL() {
 202                 return $this->getPageTitle( $this->mTarget )->getFullURL( array( 'success' => 1 ) );
 203         }
 204
 205         /**
 206          * Save user groups changes in the database.
 207          * Data comes from the editUserGroupsForm() form function
 208          *
 209          * @param string $username Username to apply changes to.
 210          * @param string $reason Reason for group change
 211          * @param User|UserRightsProxy $user Target user object.
 212          * @return null
 213          */
 214         function saveUserGroups( $username, $reason, $user ) {
 215                 $allgroups = $this->getAllGroups();
 216                 $addgroup = array();
 217                 $removegroup = array();
 218
 219                 // This could possibly create a highly unlikely race condition if permissions are changed between
 220                 //  when the form is loaded and when the form is saved. Ignoring it for the moment.
 221                 foreach ( $allgroups as $group ) {
 222                         // We'll tell it to remove all unchecked groups, and add all checked groups.
 223                         // Later on, this gets filtered for what can actually be removed
 224                         if ( $this->getRequest()->getCheck( "wpGroup-$group" ) ) {
 225                                 $addgroup[] = $group;
 226                         } else {
 227                                 $removegroup[] = $group;
 228                         }
 229                 }
 230
 231                 $this->doSaveUserGroups( $user, $addgroup, $removegroup, $reason );
 232         }
 233
 234         /**
 235          * Save user groups changes in the database.
 236          *
 237          * @param User|UserRightsProxy $user
 238          * @param array $add Array of groups to add
 239          * @param array $remove Array of groups to remove
 240          * @param string $reason Reason for group change
 241          * @return array Tuple of added, then removed groups
 242          */
 243         function doSaveUserGroups( $user, $add, $remove, $reason = '' ) {
 244                 global $wgAuth;
 245
 246                 // Validate input set...
 247                 $isself = $user->getName() == $this->getUser()->getName();
 248                 $groups = $user->getGroups();
 249                 $changeable = $this->changeableGroups();
 250                 $addable = array_merge( $changeable['add'], $isself ? $changeable['add-self'] : array() );
 251                 $removable = array_merge( $changeable['remove'], $isself ? $changeable['remove-self'] : array() );
 252
 253                 $remove = array_unique(
 254                         array_intersect( (array)$remove, $removable, $groups ) );
 255                 $add = array_unique( array_diff(
 256                         array_intersect( (array)$add, $addable ),
 257                         $groups )
 258                 );
 259
 260                 $oldGroups = $user->getGroups();
 261                 $newGroups = $oldGroups;
 262
 263                 // Remove then add groups
 264                 if ( $remove ) {
 265                         foreach ( $remove as $index => $group ) {
 266                                 if ( !$user->removeGroup( $group ) ) {
 267                                         unset( $remove[$index] );
 268                                 }
 269                         }
 270                         $newGroups = array_diff( $newGroups, $remove );
 271                 }
 272                 if ( $add ) {
 273                         foreach ( $add as $index => $group ) {
 274                                 if ( !$user->addGroup( $group ) ) {
 275                                         unset( $add[$index] );
 276                                 }
 277                         }
 278                         $newGroups = array_merge( $newGroups, $add );
 279                 }
 280                 $newGroups = array_unique( $newGroups );
 281
 282                 // Ensure that caches are cleared
 283                 $user->invalidateCache();
 284
 285                 // update groups in external authentication database
 286                 Hooks::run( 'UserGroupsChanged', array( $user, $add, $remove, $this->getUser() ) );
 287                 $wgAuth->updateExternalDBGroups( $user, $add, $remove );
 288
 289                 wfDebug( 'oldGroups: ' . print_r( $oldGroups, true ) . "\n" );
 290                 wfDebug( 'newGroups: ' . print_r( $newGroups, true ) . "\n" );
 291                 // Deprecated in favor of UserGroupsChanged hook
 292                 Hooks::run( 'UserRights', array( &$user, $add, $remove ), '1.26' );
 293
 294                 if ( $newGroups != $oldGroups ) {
 295                         $this->addLogEntry( $user, $oldGroups, $newGroups, $reason );
 296                 }
 297
 298                 return array( $add, $remove );
 299         }
 300
 301         /**
 302          * Add a rights log entry for an action.
 303          * @param User $user
 304          * @param array $oldGroups
 305          * @param array $newGroups
 306          * @param array $reason
 307          */
 308         function addLogEntry( $user, $oldGroups, $newGroups, $reason ) {
 309                 $logEntry = new ManualLogEntry( 'rights', 'rights' );
 310                 $logEntry->setPerformer( $this->getUser() );
 311                 $logEntry->setTarget( $user->getUserPage() );
 312                 $logEntry->setComment( $reason );
 313                 $logEntry->setParameters( array(
 314                         '4::oldgroups' => $oldGroups,
 315                         '5::newgroups' => $newGroups,
 316                 ) );
 317                 $logid = $logEntry->insert();
 318                 $logEntry->publish( $logid );
 319         }
 320
 321         /**
 322          * Edit user groups membership
 323          * @param string $username Name of the user.
 324          */
 325         function editUserGroupsForm( $username ) {
 326                 $status = $this->fetchUser( $username );
 327                 if ( !$status->isOK() ) {
 328                         $this->getOutput()->addWikiText( $status->getWikiText() );
 329
 330                         return;
 331                 } else {
 332                         $user = $status->value;
 333                 }
 334
 335                 $groups = $user->getGroups();
 336
 337                 $this->showEditUserGroupsForm( $user, $groups );
 338
 339                 // This isn't really ideal logging behavior, but let's not hide the
 340                 // interwiki logs if we're using them as is.
 341                 $this->showLogFragment( $user, $this->getOutput() );
 342         }
 343
 344         /**
 345          * Normalize the input username, which may be local or remote, and
 346          * return a user (or proxy) object for manipulating it.
 347          *
 348          * Side effects: error output for invalid access
 349          * @param string $username
 350          * @return Status
 351          */
 352         public function fetchUser( $username ) {
 353                 $parts = explode( $this->getConfig()->get( 'UserrightsInterwikiDelimiter' ), $username );
 354                 if ( count( $parts ) < 2 ) {
 355                         $name = trim( $username );
 356                         $database = '';
 357                 } else {
 358                         list( $name, $database ) = array_map( 'trim', $parts );
 359
 360                         if ( $database == wfWikiID() ) {
 361                                 $database = '';
 362                         } else {
 363                                 if ( !$this->getUser()->isAllowed( 'userrights-interwiki' ) ) {
 364                                         return Status::newFatal( 'userrights-no-interwiki' );
 365                                 }
 366                                 if ( !UserRightsProxy::validDatabase( $database ) ) {
 367                                         return Status::newFatal( 'userrights-nodatabase', $database );
 368                                 }
 369                         }
 370                 }
 371
 372                 if ( $name === '' ) {
 373                         return Status::newFatal( 'nouserspecified' );
 374                 }
 375
 376                 if ( $name[0] == '#' ) {
 377                         // Numeric ID can be specified...
 378                         // We'll do a lookup for the name internally.
 379                         $id = intval( substr( $name, 1 ) );
 380
 381                         if ( $database == '' ) {
 382                                 $name = User::whoIs( $id );
 383                         } else {
 384                                 $name = UserRightsProxy::whoIs( $database, $id );
 385                         }
 386
 387                         if ( !$name ) {
 388                                 return Status::newFatal( 'noname' );
 389                         }
 390                 } else {
 391                         $name = User::getCanonicalName( $name );
 392                         if ( $name === false ) {
 393                                 // invalid name
 394                                 return Status::newFatal( 'nosuchusershort', $username );
 395                         }
 396                 }
 397
 398                 if ( $database == '' ) {
 399                         $user = User::newFromName( $name );
 400                 } else {
 401                         $user = UserRightsProxy::newFromName( $database, $name );
 402                 }
 403
 404                 if ( !$user || $user->isAnon() ) {
 405                         return Status::newFatal( 'nosuchusershort', $username );
 406                 }
 407
 408                 return Status::newGood( $user );
 409         }
 410
 411         function makeGroupNameList( $ids ) {
 412                 if ( empty( $ids ) ) {
 413                         return $this->msg( 'rightsnone' )->inContentLanguage()->text();
 414                 } else {
 415                         return implode( ', ', $ids );
 416                 }
 417         }
 418
 419         /**
 420          * Make a list of group names to be stored as parameter for log entries
 421          *
 422          * @deprecated since 1.21; use LogFormatter instead.
 423          * @param array $ids
 424          * @return string
 425          */
 426         function makeGroupNameListForLog( $ids ) {
 427                 wfDeprecated( __METHOD__, '1.21' );
 428
 429                 if ( empty( $ids ) ) {
 430                         return '';
 431                 } else {
 432                         return $this->makeGroupNameList( $ids );
 433                 }
 434         }
 435
 436         /**
 437          * Output a form to allow searching for a user
 438          */
 439         function switchForm() {
 440                 $this->getOutput()->addModules( 'mediawiki.userSuggest' );
 441
 442                 $this->getOutput()->addHTML(
 443                         Html::openElement(
 444                                 'form',
 445                                 array(
 446                                         'method' => 'get',
 447                                         'action' => wfScript(),
 448                                         'name' => 'uluser',
 449                                         'id' => 'mw-userrights-form1'
 450                                 )
 451                         ) .
 452                         Html::hidden( 'title', $this->getPageTitle()->getPrefixedText() ) .
 453                         Xml::fieldset( $this->msg( 'userrights-lookup-user' )->text() ) .
 454                         Xml::inputLabel(
 455                                 $this->msg( 'userrights-user-editname' )->text(),
 456                                 'user',
 457                                 'username',
 458                                 30,
 459                                 str_replace( '_', ' ', $this->mTarget ),
 460                                 array(
 461                                         'autofocus' => '',
 462                                         'class' => 'mw-autocomplete-user', // used by mediawiki.userSuggest
 463                                 )
 464                         ) . ' ' .
 465                         Xml::submitButton( $this->msg( 'editusergroup' )->text() ) .
 466                         Html::closeElement( 'fieldset' ) .
 467                         Html::closeElement( 'form' ) . "\n"
 468                 );
 469         }
 470
 471         /**
 472          * Go through used and available groups and return the ones that this
 473          * form will be able to manipulate based on the current user's system
 474          * permissions.
 475          *
 476          * @param array $groups List of groups the given user is in
 477          * @return array Tuple of addable, then removable groups
 478          */
 479         protected function splitGroups( $groups ) {
 480                 list( $addable, $removable, $addself, $removeself ) = array_values( $this->changeableGroups() );
 481
 482                 $removable = array_intersect(
 483                         array_merge( $this->isself ? $removeself : array(), $removable ),
 484                         $groups
 485                 ); // Can't remove groups the user doesn't have
 486                 $addable = array_diff(
 487                         array_merge( $this->isself ? $addself : array(), $addable ),
 488                         $groups
 489                 ); // Can't add groups the user does have
 490
 491                 return array( $addable, $removable );
 492         }
 493
 494         /**
 495          * Show the form to edit group memberships.
 496          *
 497          * @param User|UserRightsProxy $user User or UserRightsProxy you're editing
 498          * @param array $groups Array of groups the user is in
 499          */
 500         protected function showEditUserGroupsForm( $user, $groups ) {
 501                 $list = array();
 502                 $membersList = array();
 503                 foreach ( $groups as $group ) {
 504                         $list[] = self::buildGroupLink( $group );
 505                         $membersList[] = self::buildGroupMemberLink( $group );
 506                 }
 507
 508                 $autoList = array();
 509                 $autoMembersList = array();
 510                 if ( $user instanceof User ) {
 511                         foreach ( Autopromote::getAutopromoteGroups( $user ) as $group ) {
 512                                 $autoList[] = self::buildGroupLink( $group );
 513                                 $autoMembersList[] = self::buildGroupMemberLink( $group );
 514                         }
 515                 }
 516
 517                 $language = $this->getLanguage();
 518                 $displayedList = $this->msg( 'userrights-groupsmember-type' )
 519                         ->rawParams(
 520                                 $language->listToText( $list ),
 521                                 $language->listToText( $membersList )
 522                         )->escaped();
 523                 $displayedAutolist = $this->msg( 'userrights-groupsmember-type' )
 524                         ->rawParams(
 525                                 $language->listToText( $autoList ),
 526                                 $language->listToText( $autoMembersList )
 527                         )->escaped();
 528
 529                 $grouplist = '';
 530                 $count = count( $list );
 531                 if ( $count > 0 ) {
 532                         $grouplist = $this->msg( 'userrights-groupsmember' )
 533                                 ->numParams( $count )
 534                                 ->params( $user->getName() )
 535                                 ->parse();
 536                         $grouplist = '<p>' . $grouplist . ' ' . $displayedList . "</p>\n";
 537                 }
 538
 539                 $count = count( $autoList );
 540                 if ( $count > 0 ) {
 541                         $autogrouplistintro = $this->msg( 'userrights-groupsmember-auto' )
 542                                 ->numParams( $count )
 543                                 ->params( $user->getName() )
 544                                 ->parse();
 545                         $grouplist .= '<p>' . $autogrouplistintro . ' ' . $displayedAutolist . "</p>\n";
 546                 }
 547
 548                 $userToolLinks = Linker::userToolLinks(
 549                         $user->getId(),
 550                         $user->getName(),
 551                         false, /* default for redContribsWhenNoEdits */
 552                         Linker::TOOL_LINKS_EMAIL /* Add "send e-mail" link */
 553                 );
 554
 555                 $this->getOutput()->addHTML(
 556                         Xml::openElement(
 557                                 'form',
 558                                 array(
 559                                         'method' => 'post',
 560                                         'action' => $this->getPageTitle()->getLocalURL(),
 561                                         'name' => 'editGroup',
 562                                         'id' => 'mw-userrights-form2'
 563                                 )
 564                         ) .
 565                         Html::hidden( 'user', $this->mTarget ) .
 566                         Html::hidden( 'wpEditToken', $this->getUser()->getEditToken( $this->mTarget ) ) .
 567                         Html::hidden(
 568                                 'conflictcheck-originalgroups',
 569                                 implode( ',', $user->getGroups() )
 570                         ) . // Conflict detection
 571                         Xml::openElement( 'fieldset' ) .
 572                         Xml::element(
 573                                 'legend',
 574                                 array(),
 575                                 $this->msg( 'userrights-editusergroup', $user->getName() )->text()
 576                         ) .
 577                         $this->msg( 'editinguser' )->params( wfEscapeWikiText( $user->getName() ) )
 578                                 ->rawParams( $userToolLinks )->parse() .
 579                         $this->msg( 'userrights-groups-help', $user->getName() )->parse() .
 580                         $grouplist .
 581                         $this->groupCheckboxes( $groups, $user ) .
 582                         Xml::openElement( 'table', array( 'id' => 'mw-userrights-table-outer' ) ) .
 583                                 "<tr>
 584                                         <td class='mw-label'>" .
 585                                                 Xml::label( $this->msg( 'userrights-reason' )->text(), 'wpReason' ) .
 586                                         "</td>
 587                                         <td class='mw-input'>" .
 588                                                 Xml::input( 'user-reason', 60, $this->getRequest()->getVal( 'user-reason', false ),
 589                                                         array( 'id' => 'wpReason', 'maxlength' => 255 ) ) .
 590                                         "</td>
 591                                 </tr>
 592                                 <tr>
 593                                         <td></td>
 594                                         <td class='mw-submit'>" .
 595                                                 Xml::submitButton( $this->msg( 'saveusergroups' )->text(),
 596                                                         array( 'name' => 'saveusergroups' ) +
 597                                                                 Linker::tooltipAndAccesskeyAttribs( 'userrights-set' )
 598                                                 ) .
 599                                         "</td>
 600                                 </tr>" .
 601                         Xml::closeElement( 'table' ) . "\n" .
 602                         Xml::closeElement( 'fieldset' ) .
 603                         Xml::closeElement( 'form' ) . "\n"
 604                 );
 605         }
 606
 607         /**
 608          * Format a link to a group description page
 609          *
 610          * @param string $group
 611          * @return string
 612          */
 613         private static function buildGroupLink( $group ) {
 614                 return User::makeGroupLinkHtml( $group, User::getGroupName( $group ) );
 615         }
 616
 617         /**
 618          * Format a link to a group member description page
 619          *
 620          * @param string $group
 621          * @return string
 622          */
 623         private static function buildGroupMemberLink( $group ) {
 624                 return User::makeGroupLinkHtml( $group, User::getGroupMember( $group ) );
 625         }
 626
 627         /**
 628          * Returns an array of all groups that may be edited
 629          * @return array Array of groups that may be edited.
 630          */
 631         protected static function getAllGroups() {
 632                 return User::getAllGroups();
 633         }
 634
 635         /**
 636          * Adds a table with checkboxes where you can select what groups to add/remove
 637          *
 638          * @todo Just pass the username string?
 639          * @param array $usergroups Groups the user belongs to
 640          * @param User $user
 641          * @return string XHTML table element with checkboxes
 642          */
 643         private function groupCheckboxes( $usergroups, $user ) {
 644                 $allgroups = $this->getAllGroups();
 645                 $ret = '';
 646
 647                 // Put all column info into an associative array so that extensions can
 648                 // more easily manage it.
 649                 $columns = array( 'unchangeable' => array(), 'changeable' => array() );
 650
 651                 foreach ( $allgroups as $group ) {
 652                         $set = in_array( $group, $usergroups );
 653                         // Should the checkbox be disabled?
 654                         $disabled = !(
 655                                 ( $set && $this->canRemove( $group ) ) ||
 656                                 ( !$set && $this->canAdd( $group ) ) );
 657                         // Do we need to point out that this action is irreversible?
 658                         $irreversible = !$disabled && (
 659                                 ( $set && !$this->canAdd( $group ) ) ||
 660                                 ( !$set && !$this->canRemove( $group ) ) );
 661
 662                         $checkbox = array(
 663                                 'set' => $set,
 664                                 'disabled' => $disabled,
 665                                 'irreversible' => $irreversible
 666                         );
 667
 668                         if ( $disabled ) {
 669                                 $columns['unchangeable'][$group] = $checkbox;
 670                         } else {
 671                                 $columns['changeable'][$group] = $checkbox;
 672                         }
 673                 }
 674
 675                 // Build the HTML table
 676                 $ret .= Xml::openElement( 'table', array( 'class' => 'mw-userrights-groups' ) ) .
 677                         "<tr>\n";
 678                 foreach ( $columns as $name => $column ) {
 679                         if ( $column === array() ) {
 680                                 continue;
 681                         }
 682                         // Messages: userrights-changeable-col, userrights-unchangeable-col
 683                         $ret .= Xml::element(
 684                                 'th',
 685                                 null,
 686                                 $this->msg( 'userrights-' . $name . '-col', count( $column ) )->text()
 687                         );
 688                 }
 689
 690                 $ret .= "</tr>\n<tr>\n";
 691                 foreach ( $columns as $column ) {
 692                         if ( $column === array() ) {
 693                                 continue;
 694                         }
 695                         $ret .= "\t<td style='vertical-align:top;'>\n";
 696                         foreach ( $column as $group => $checkbox ) {
 697                                 $attr = $checkbox['disabled'] ? array( 'disabled' => 'disabled' ) : array();
 698
 699                                 $member = User::getGroupMember( $group, $user->getName() );
 700                                 if ( $checkbox['irreversible'] ) {
 701                                         $text = $this->msg( 'userrights-irreversible-marker', $member )->text();
 702                                 } else {
 703                                         $text = $member;
 704                                 }
 705                                 $checkboxHtml = Xml::checkLabel( $text, "wpGroup-" . $group,
 706                                         "wpGroup-" . $group, $checkbox['set'], $attr );
 707                                 $ret .= "\t\t" . ( $checkbox['disabled']
 708                                         ? Xml::tags( 'span', array( 'class' => 'mw-userrights-disabled' ), $checkboxHtml )
 709                                         : $checkboxHtml
 710                                 ) . "<br />\n";
 711                         }
 712                         $ret .= "\t</td>\n";
 713                 }
 714                 $ret .= Xml::closeElement( 'tr' ) . Xml::closeElement( 'table' );
 715
 716                 return $ret;
 717         }
 718
 719         /**
 720          * @param string $group The name of the group to check
 721          * @return bool Can we remove the group?
 722          */
 723         private function canRemove( $group ) {
 724                 // $this->changeableGroups()['remove'] doesn't work, of course. Thanks, PHP.
 725                 $groups = $this->changeableGroups();
 726
 727                 return in_array(
 728                         $group,
 729                         $groups['remove'] ) || ( $this->isself && in_array( $group, $groups['remove-self'] )
 730                 );
 731         }
 732
 733         /**
 734          * @param string $group The name of the group to check
 735          * @return bool Can we add the group?
 736          */
 737         private function canAdd( $group ) {
 738                 $groups = $this->changeableGroups();
 739
 740                 return in_array(
 741                         $group,
 742                         $groups['add'] ) || ( $this->isself && in_array( $group, $groups['add-self'] )
 743                 );
 744         }
 745
 746         /**
 747          * Returns $this->getUser()->changeableGroups()
 748          *
 749          * @return array Array(
 750          *   'add' => array( addablegroups ),
 751          *   'remove' => array( removablegroups ),
 752          *   'add-self' => array( addablegroups to self ),
 753          *   'remove-self' => array( removable groups from self )
 754          *  )
 755          */
 756         function changeableGroups() {
 757                 return $this->getUser()->changeableGroups();
 758         }
 759
 760         /**
 761          * Show a rights log fragment for the specified user
 762          *
 763          * @param User $user User to show log for
 764          * @param OutputPage $output OutputPage to use
 765          */
 766         protected function showLogFragment( $user, $output ) {
 767                 $rightsLogPage = new LogPage( 'rights' );
 768                 $output->addHTML( Xml::element( 'h2', null, $rightsLogPage->getName()->text() ) );
 769                 LogEventsList::showLogExtract( $output, 'rights', $user->getUserPage() );
 770         }
 771
 772         protected function getGroupName() {
 773                 return 'users';
 774         }
 775 }