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         /**
  31          * The target of the local right-adjuster's interest.  Can be gotten from
  32          * either a GET parameter or a subpage-style parameter, so have a member
  33          * variable for it.
  34          * @var null|string $mTarget
  35          */
  36         protected $mTarget;
  37         /*
  38          * @var null|User $mFetchedUser The user object of the target username or null.
  39          */
  40         protected $mFetchedUser = null;
  41         protected $isself = false;
  42
  43         public function __construct() {
  44                 parent::__construct( 'Userrights' );
  45         }
  46
  47         public function doesWrites() {
  48                 return true;
  49         }
  50
  51         /**
  52          * @param User $user
  53          * @param bool $checkIfSelf
  54          * @return bool
  55          */
  56         public function userCanChangeRights( $user, $checkIfSelf = true ) {
  57                 $available = $this->changeableGroups();
  58                 if ( $user->getId() == 0 ) {
  59                         return false;
  60                 }
  61
  62                 return !empty( $available['add'] )
  63                         || !empty( $available['remove'] )
  64                         || ( ( $this->isself || !$checkIfSelf ) &&
  65                                 ( !empty( $available['add-self'] )
  66                                         || !empty( $available['remove-self'] ) ) );
  67         }
  68
  69         /**
  70          * Manage forms to be shown according to posted data.
  71          * Depending on the submit button used, call a form or a save function.
  72          *
  73          * @param string|null $par String if any subpage provided, else null
  74          * @throws UserBlockedError|PermissionsError
  75          */
  76         public function execute( $par ) {
  77                 $user = $this->getUser();
  78                 $request = $this->getRequest();
  79                 $out = $this->getOutput();
  80
  81                 if ( $par !== null ) {
  82                         $this->mTarget = $par;
  83                 } else {
  84                         $this->mTarget = $request->getVal( 'user' );
  85                 }
  86
  87                 if ( is_string( $this->mTarget ) ) {
  88                         $this->mTarget = trim( $this->mTarget );
  89                 }
  90
  91                 if ( $this->mTarget !== null && User::getCanonicalName( $this->mTarget ) === $user->getName() ) {
  92                         $this->isself = true;
  93                 }
  94
  95                 $fetchedStatus = $this->fetchUser( $this->mTarget, true );
  96                 if ( $fetchedStatus->isOK() ) {
  97                         $this->mFetchedUser = $fetchedStatus->value;
  98                         if ( $this->mFetchedUser instanceof User ) {
  99                                 // Set the 'relevant user' in the skin, so it displays links like Contributions,
 100                                 // User logs, UserRights, etc.
 101                                 $this->getSkin()->setRelevantUser( $this->mFetchedUser );
 102                         }
 103                 }
 104
 105                 // show a successbox, if the user rights was saved successfully
 106                 if ( $request->getCheck( 'success' ) && $this->mFetchedUser !== null ) {
 107                         $out->addModules( [ 'mediawiki.special.userrights' ] );
 108                         $out->addModuleStyles( 'mediawiki.notification.convertmessagebox.styles' );
 109                         $out->addHTML(
 110                                 Html::rawElement(
 111                                         'div',
 112                                         [
 113                                                 'class' => 'mw-notify-success successbox',
 114                                                 'id' => 'mw-preferences-success',
 115                                                 'data-mw-autohide' => 'false',
 116                                         ],
 117                                         Html::element(
 118                                                 'p',
 119                                                 [],
 120                                                 $this->msg( 'savedrights', $this->mFetchedUser->getName() )->text()
 121                                         )
 122                                 )
 123                         );
 124                 }
 125
 126                 $this->setHeaders();
 127                 $this->outputHeader();
 128
 129                 $out->addModuleStyles( 'mediawiki.special' );
 130                 $this->addHelpLink( 'Help:Assigning permissions' );
 131
 132                 $this->switchForm();
 133
 134                 if (
 135                         $request->wasPosted() &&
 136                         $request->getCheck( 'saveusergroups' ) &&
 137                         $this->mTarget !== null &&
 138                         $user->matchEditToken( $request->getVal( 'wpEditToken' ), $this->mTarget )
 139                 ) {
 140                         /*
 141                         * If the user is blocked and they only have "partial" access
 142                         * (e.g. they don't have the userrights permission), then don't
 143                         * allow them to change any user rights.
 144                         */
 145                         if ( $user->isBlocked() && !$user->isAllowed( 'userrights' ) ) {
 146                                 throw new UserBlockedError( $user->getBlock() );
 147                         }
 148
 149                         $this->checkReadOnly();
 150
 151                         // save settings
 152                         if ( !$fetchedStatus->isOK() ) {
 153                                 $this->getOutput()->addWikiText( $fetchedStatus->getWikiText() );
 154
 155                                 return;
 156                         }
 157
 158                         $targetUser = $this->mFetchedUser;
 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( [ '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 = [];
 202                 $removegroup = [];
 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                 // Validate input set...
 230                 $isself = $user->getName() == $this->getUser()->getName();
 231                 $groups = $user->getGroups();
 232                 $changeable = $this->changeableGroups();
 233                 $addable = array_merge( $changeable['add'], $isself ? $changeable['add-self'] : [] );
 234                 $removable = array_merge( $changeable['remove'], $isself ? $changeable['remove-self'] : [] );
 235
 236                 $remove = array_unique(
 237                         array_intersect( (array)$remove, $removable, $groups ) );
 238                 $add = array_unique( array_diff(
 239                         array_intersect( (array)$add, $addable ),
 240                         $groups )
 241                 );
 242
 243                 $oldGroups = $user->getGroups();
 244                 $newGroups = $oldGroups;
 245
 246                 // Remove then add groups
 247                 if ( $remove ) {
 248                         foreach ( $remove as $index => $group ) {
 249                                 if ( !$user->removeGroup( $group ) ) {
 250                                         unset( $remove[$index] );
 251                                 }
 252                         }
 253                         $newGroups = array_diff( $newGroups, $remove );
 254                 }
 255                 if ( $add ) {
 256                         foreach ( $add as $index => $group ) {
 257                                 if ( !$user->addGroup( $group ) ) {
 258                                         unset( $add[$index] );
 259                                 }
 260                         }
 261                         $newGroups = array_merge( $newGroups, $add );
 262                 }
 263                 $newGroups = array_unique( $newGroups );
 264
 265                 // Ensure that caches are cleared
 266                 $user->invalidateCache();
 267
 268                 // update groups in external authentication database
 269                 Hooks::run( 'UserGroupsChanged', [ $user, $add, $remove, $this->getUser(), $reason ] );
 270                 MediaWiki\Auth\AuthManager::callLegacyAuthPlugin(
 271                         'updateExternalDBGroups', [ $user, $add, $remove ]
 272                 );
 273
 274                 wfDebug( 'oldGroups: ' . print_r( $oldGroups, true ) . "\n" );
 275                 wfDebug( 'newGroups: ' . print_r( $newGroups, true ) . "\n" );
 276                 // Deprecated in favor of UserGroupsChanged hook
 277                 Hooks::run( 'UserRights', [ &$user, $add, $remove ], '1.26' );
 278
 279                 if ( $newGroups != $oldGroups ) {
 280                         $this->addLogEntry( $user, $oldGroups, $newGroups, $reason );
 281                 }
 282
 283                 return [ $add, $remove ];
 284         }
 285
 286         /**
 287          * Add a rights log entry for an action.
 288          * @param User $user
 289          * @param array $oldGroups
 290          * @param array $newGroups
 291          * @param array $reason
 292          */
 293         function addLogEntry( $user, $oldGroups, $newGroups, $reason ) {
 294                 $logEntry = new ManualLogEntry( 'rights', 'rights' );
 295                 $logEntry->setPerformer( $this->getUser() );
 296                 $logEntry->setTarget( $user->getUserPage() );
 297                 $logEntry->setComment( $reason );
 298                 $logEntry->setParameters( [
 299                         '4::oldgroups' => $oldGroups,
 300                         '5::newgroups' => $newGroups,
 301                 ] );
 302                 $logid = $logEntry->insert();
 303                 $logEntry->publish( $logid );
 304         }
 305
 306         /**
 307          * Edit user groups membership
 308          * @param string $username Name of the user.
 309          */
 310         function editUserGroupsForm( $username ) {
 311                 $status = $this->fetchUser( $username, true );
 312                 if ( !$status->isOK() ) {
 313                         $this->getOutput()->addWikiText( $status->getWikiText() );
 314
 315                         return;
 316                 } else {
 317                         $user = $status->value;
 318                 }
 319
 320                 $groups = $user->getGroups();
 321
 322                 $this->showEditUserGroupsForm( $user, $groups );
 323
 324                 // This isn't really ideal logging behavior, but let's not hide the
 325                 // interwiki logs if we're using them as is.
 326                 $this->showLogFragment( $user, $this->getOutput() );
 327         }
 328
 329         /**
 330          * Normalize the input username, which may be local or remote, and
 331          * return a user (or proxy) object for manipulating it.
 332          *
 333          * Side effects: error output for invalid access
 334          * @param string $username
 335          * @param bool $writing
 336          * @return Status
 337          */
 338         public function fetchUser( $username, $writing = true ) {
 339                 $parts = explode( $this->getConfig()->get( 'UserrightsInterwikiDelimiter' ), $username );
 340                 if ( count( $parts ) < 2 ) {
 341                         $name = trim( $username );
 342                         $database = '';
 343                 } else {
 344                         list( $name, $database ) = array_map( 'trim', $parts );
 345
 346                         if ( $database == wfWikiID() ) {
 347                                 $database = '';
 348                         } else {
 349                                 if ( $writing && !$this->getUser()->isAllowed( 'userrights-interwiki' ) ) {
 350                                         return Status::newFatal( 'userrights-no-interwiki' );
 351                                 }
 352                                 if ( !UserRightsProxy::validDatabase( $database ) ) {
 353                                         return Status::newFatal( 'userrights-nodatabase', $database );
 354                                 }
 355                         }
 356                 }
 357
 358                 if ( $name === '' ) {
 359                         return Status::newFatal( 'nouserspecified' );
 360                 }
 361
 362                 if ( $name[0] == '#' ) {
 363                         // Numeric ID can be specified...
 364                         // We'll do a lookup for the name internally.
 365                         $id = intval( substr( $name, 1 ) );
 366
 367                         if ( $database == '' ) {
 368                                 $name = User::whoIs( $id );
 369                         } else {
 370                                 $name = UserRightsProxy::whoIs( $database, $id );
 371                         }
 372
 373                         if ( !$name ) {
 374                                 return Status::newFatal( 'noname' );
 375                         }
 376                 } else {
 377                         $name = User::getCanonicalName( $name );
 378                         if ( $name === false ) {
 379                                 // invalid name
 380                                 return Status::newFatal( 'nosuchusershort', $username );
 381                         }
 382                 }
 383
 384                 if ( $database == '' ) {
 385                         $user = User::newFromName( $name );
 386                 } else {
 387                         $user = UserRightsProxy::newFromName( $database, $name );
 388                 }
 389
 390                 if ( !$user || $user->isAnon() ) {
 391                         return Status::newFatal( 'nosuchusershort', $username );
 392                 }
 393
 394                 return Status::newGood( $user );
 395         }
 396
 397         /**
 398          * @since 1.15
 399          *
 400          * @param array $ids
 401          *
 402          * @return string
 403          */
 404         public function makeGroupNameList( $ids ) {
 405                 if ( empty( $ids ) ) {
 406                         return $this->msg( 'rightsnone' )->inContentLanguage()->text();
 407                 } else {
 408                         return implode( ', ', $ids );
 409                 }
 410         }
 411
 412         /**
 413          * Output a form to allow searching for a user
 414          */
 415         function switchForm() {
 416                 $this->getOutput()->addModules( 'mediawiki.userSuggest' );
 417
 418                 $this->getOutput()->addHTML(
 419                         Html::openElement(
 420                                 'form',
 421                                 [
 422                                         'method' => 'get',
 423                                         'action' => wfScript(),
 424                                         'name' => 'uluser',
 425                                         'id' => 'mw-userrights-form1'
 426                                 ]
 427                         ) .
 428                         Html::hidden( 'title', $this->getPageTitle()->getPrefixedText() ) .
 429                         Xml::fieldset( $this->msg( 'userrights-lookup-user' )->text() ) .
 430                         Xml::inputLabel(
 431                                 $this->msg( 'userrights-user-editname' )->text(),
 432                                 'user',
 433                                 'username',
 434                                 30,
 435                                 str_replace( '_', ' ', $this->mTarget ),
 436                                 [
 437                                         'class' => 'mw-autocomplete-user', // used by mediawiki.userSuggest
 438                                 ] + (
 439                                         // Set autofocus on blank input and error input
 440                                         $this->mFetchedUser === null ? [ 'autofocus' => '' ] : []
 441                                 )
 442                         ) . ' ' .
 443                         Xml::submitButton(
 444                                 $this->msg( 'editusergroup' )->text()
 445                         ) .
 446                         Html::closeElement( 'fieldset' ) .
 447                         Html::closeElement( 'form' ) . "\n"
 448                 );
 449         }
 450
 451         /**
 452          * Go through used and available groups and return the ones that this
 453          * form will be able to manipulate based on the current user's system
 454          * permissions.
 455          *
 456          * @param array $groups List of groups the given user is in
 457          * @return array Tuple of addable, then removable groups
 458          */
 459         protected function splitGroups( $groups ) {
 460                 list( $addable, $removable, $addself, $removeself ) = array_values( $this->changeableGroups() );
 461
 462                 $removable = array_intersect(
 463                         array_merge( $this->isself ? $removeself : [], $removable ),
 464                         $groups
 465                 ); // Can't remove groups the user doesn't have
 466                 $addable = array_diff(
 467                         array_merge( $this->isself ? $addself : [], $addable ),
 468                         $groups
 469                 ); // Can't add groups the user does have
 470
 471                 return [ $addable, $removable ];
 472         }
 473
 474         /**
 475          * Show the form to edit group memberships.
 476          *
 477          * @param User|UserRightsProxy $user User or UserRightsProxy you're editing
 478          * @param array $groups Array of groups the user is in
 479          */
 480         protected function showEditUserGroupsForm( $user, $groups ) {
 481                 $list = [];
 482                 $membersList = [];
 483                 foreach ( $groups as $group ) {
 484                         $list[] = self::buildGroupLink( $group );
 485                         $membersList[] = self::buildGroupMemberLink( $group );
 486                 }
 487
 488                 $autoList = [];
 489                 $autoMembersList = [];
 490                 if ( $user instanceof User ) {
 491                         foreach ( Autopromote::getAutopromoteGroups( $user ) as $group ) {
 492                                 $autoList[] = self::buildGroupLink( $group );
 493                                 $autoMembersList[] = self::buildGroupMemberLink( $group );
 494                         }
 495                 }
 496
 497                 $language = $this->getLanguage();
 498                 $displayedList = $this->msg( 'userrights-groupsmember-type' )
 499                         ->rawParams(
 500                                 $language->listToText( $list ),
 501                                 $language->listToText( $membersList )
 502                         )->escaped();
 503                 $displayedAutolist = $this->msg( 'userrights-groupsmember-type' )
 504                         ->rawParams(
 505                                 $language->listToText( $autoList ),
 506                                 $language->listToText( $autoMembersList )
 507                         )->escaped();
 508
 509                 $grouplist = '';
 510                 $count = count( $list );
 511                 if ( $count > 0 ) {
 512                         $grouplist = $this->msg( 'userrights-groupsmember' )
 513                                 ->numParams( $count )
 514                                 ->params( $user->getName() )
 515                                 ->parse();
 516                         $grouplist = '<p>' . $grouplist . ' ' . $displayedList . "</p>\n";
 517                 }
 518
 519                 $count = count( $autoList );
 520                 if ( $count > 0 ) {
 521                         $autogrouplistintro = $this->msg( 'userrights-groupsmember-auto' )
 522                                 ->numParams( $count )
 523                                 ->params( $user->getName() )
 524                                 ->parse();
 525                         $grouplist .= '<p>' . $autogrouplistintro . ' ' . $displayedAutolist . "</p>\n";
 526                 }
 527
 528                 $userToolLinks = Linker::userToolLinks(
 529                         $user->getId(),
 530                         $user->getName(),
 531                         false, /* default for redContribsWhenNoEdits */
 532                         Linker::TOOL_LINKS_EMAIL /* Add "send e-mail" link */
 533                 );
 534
 535                 list( $groupCheckboxes, $canChangeAny ) = $this->groupCheckboxes( $groups, $user );
 536                 $this->getOutput()->addHTML(
 537                         Xml::openElement(
 538                                 'form',
 539                                 [
 540                                         'method' => 'post',
 541                                         'action' => $this->getPageTitle()->getLocalURL(),
 542                                         'name' => 'editGroup',
 543                                         'id' => 'mw-userrights-form2'
 544                                 ]
 545                         ) .
 546                         Html::hidden( 'user', $this->mTarget ) .
 547                         Html::hidden( 'wpEditToken', $this->getUser()->getEditToken( $this->mTarget ) ) .
 548                         Html::hidden(
 549                                 'conflictcheck-originalgroups',
 550                                 implode( ',', $user->getGroups() )
 551                         ) . // Conflict detection
 552                         Xml::openElement( 'fieldset' ) .
 553                         Xml::element(
 554                                 'legend',
 555                                 [],
 556                                 $this->msg(
 557                                         $canChangeAny ? 'userrights-editusergroup' : 'userrights-viewusergroup',
 558                                         $user->getName()
 559                                 )->text()
 560                         ) .
 561                         $this->msg(
 562                                 $canChangeAny ? 'editinguser' : 'viewinguserrights'
 563                         )->params( wfEscapeWikiText( $user->getName() ) )
 564                                 ->rawParams( $userToolLinks )->parse()
 565                 );
 566                 if ( $canChangeAny ) {
 567                         $this->getOutput()->addHTML(
 568                                 $this->msg( 'userrights-groups-help', $user->getName() )->parse() .
 569                                 $grouplist .
 570                                 $groupCheckboxes .
 571                                 Xml::openElement( 'table', [ 'id' => 'mw-userrights-table-outer' ] ) .
 572                                         "<tr>
 573                                                 <td class='mw-label'>" .
 574                                                         Xml::label( $this->msg( 'userrights-reason' )->text(), 'wpReason' ) .
 575                                                 "</td>
 576                                                 <td class='mw-input'>" .
 577                                                         Xml::input( 'user-reason', 60, $this->getRequest()->getVal( 'user-reason', false ),
 578                                                                 [ 'id' => 'wpReason', 'maxlength' => 255 ] ) .
 579                                                 "</td>
 580                                         </tr>
 581                                         <tr>
 582                                                 <td></td>
 583                                                 <td class='mw-submit'>" .
 584                                                         Xml::submitButton( $this->msg( 'saveusergroups', $user->getName() )->text(),
 585                                                                 [ 'name' => 'saveusergroups' ] +
 586                                                                         Linker::tooltipAndAccesskeyAttribs( 'userrights-set' )
 587                                                         ) .
 588                                                 "</td>
 589                                         </tr>" .
 590                                 Xml::closeElement( 'table' ) . "\n"
 591                         );
 592                 } else {
 593                         $this->getOutput()->addHTML( $grouplist );
 594                 }
 595                 $this->getOutput()->addHTML(
 596                         Xml::closeElement( 'fieldset' ) .
 597                         Xml::closeElement( 'form' ) . "\n"
 598                 );
 599         }
 600
 601         /**
 602          * Format a link to a group description page
 603          *
 604          * @param string $group
 605          * @return string
 606          */
 607         private static function buildGroupLink( $group ) {
 608                 return User::makeGroupLinkHTML( $group, User::getGroupName( $group ) );
 609         }
 610
 611         /**
 612          * Format a link to a group member description page
 613          *
 614          * @param string $group
 615          * @return string
 616          */
 617         private static function buildGroupMemberLink( $group ) {
 618                 return User::makeGroupLinkHTML( $group, User::getGroupMember( $group ) );
 619         }
 620
 621         /**
 622          * Returns an array of all groups that may be edited
 623          * @return array Array of groups that may be edited.
 624          */
 625         protected static function getAllGroups() {
 626                 return User::getAllGroups();
 627         }
 628
 629         /**
 630          * Adds a table with checkboxes where you can select what groups to add/remove
 631          *
 632          * @todo Just pass the username string?
 633          * @param array $usergroups Groups the user belongs to
 634          * @param User $user
 635          * @return Array with 2 elements: the XHTML table element with checkxboes, and
 636          * whether any groups are changeable
 637          */
 638         private function groupCheckboxes( $usergroups, $user ) {
 639                 $allgroups = $this->getAllGroups();
 640                 $ret = '';
 641
 642                 // Put all column info into an associative array so that extensions can
 643                 // more easily manage it.
 644                 $columns = [ 'unchangeable' => [], 'changeable' => [] ];
 645
 646                 foreach ( $allgroups as $group ) {
 647                         $set = in_array( $group, $usergroups );
 648                         // Should the checkbox be disabled?
 649                         $disabled = !(
 650                                 ( $set && $this->canRemove( $group ) ) ||
 651                                 ( !$set && $this->canAdd( $group ) ) );
 652                         // Do we need to point out that this action is irreversible?
 653                         $irreversible = !$disabled && (
 654                                 ( $set && !$this->canAdd( $group ) ) ||
 655                                 ( !$set && !$this->canRemove( $group ) ) );
 656
 657                         $checkbox = [
 658                                 'set' => $set,
 659                                 'disabled' => $disabled,
 660                                 'irreversible' => $irreversible
 661                         ];
 662
 663                         if ( $disabled ) {
 664                                 $columns['unchangeable'][$group] = $checkbox;
 665                         } else {
 666                                 $columns['changeable'][$group] = $checkbox;
 667                         }
 668                 }
 669
 670                 // Build the HTML table
 671                 $ret .= Xml::openElement( 'table', [ 'class' => 'mw-userrights-groups' ] ) .
 672                         "<tr>\n";
 673                 foreach ( $columns as $name => $column ) {
 674                         if ( $column === [] ) {
 675                                 continue;
 676                         }
 677                         // Messages: userrights-changeable-col, userrights-unchangeable-col
 678                         $ret .= Xml::element(
 679                                 'th',
 680                                 null,
 681                                 $this->msg( 'userrights-' . $name . '-col', count( $column ) )->text()
 682                         );
 683                 }
 684
 685                 $ret .= "</tr>\n<tr>\n";
 686                 foreach ( $columns as $column ) {
 687                         if ( $column === [] ) {
 688                                 continue;
 689                         }
 690                         $ret .= "\t<td style='vertical-align:top;'>\n";
 691                         foreach ( $column as $group => $checkbox ) {
 692                                 $attr = $checkbox['disabled'] ? [ 'disabled' => 'disabled' ] : [];
 693
 694                                 $member = User::getGroupMember( $group, $user->getName() );
 695                                 if ( $checkbox['irreversible'] ) {
 696                                         $text = $this->msg( 'userrights-irreversible-marker', $member )->text();
 697                                 } else {
 698                                         $text = $member;
 699                                 }
 700                                 $checkboxHtml = Xml::checkLabel( $text, "wpGroup-" . $group,
 701                                         "wpGroup-" . $group, $checkbox['set'], $attr );
 702                                 $ret .= "\t\t" . ( $checkbox['disabled']
 703                                         ? Xml::tags( 'span', [ 'class' => 'mw-userrights-disabled' ], $checkboxHtml )
 704                                         : $checkboxHtml
 705                                 ) . "<br />\n";
 706                         }
 707                         $ret .= "\t</td>\n";
 708                 }
 709                 $ret .= Xml::closeElement( 'tr' ) . Xml::closeElement( 'table' );
 710
 711                 return [ $ret, (bool)$columns['changeable'] ];
 712         }
 713
 714         /**
 715          * @param string $group The name of the group to check
 716          * @return bool Can we remove the group?
 717          */
 718         private function canRemove( $group ) {
 719                 $groups = $this->changeableGroups();
 720
 721                 return in_array(
 722                         $group,
 723                         $groups['remove'] ) || ( $this->isself && in_array( $group, $groups['remove-self'] )
 724                 );
 725         }
 726
 727         /**
 728          * @param string $group The name of the group to check
 729          * @return bool Can we add the group?
 730          */
 731         private function canAdd( $group ) {
 732                 $groups = $this->changeableGroups();
 733
 734                 return in_array(
 735                         $group,
 736                         $groups['add'] ) || ( $this->isself && in_array( $group, $groups['add-self'] )
 737                 );
 738         }
 739
 740         /**
 741          * Returns $this->getUser()->changeableGroups()
 742          *
 743          * @return array Array(
 744          *   'add' => array( addablegroups ),
 745          *   'remove' => array( removablegroups ),
 746          *   'add-self' => array( addablegroups to self ),
 747          *   'remove-self' => array( removable groups from self )
 748          *  )
 749          */
 750         function changeableGroups() {
 751                 return $this->getUser()->changeableGroups();
 752         }
 753
 754         /**
 755          * Show a rights log fragment for the specified user
 756          *
 757          * @param User $user User to show log for
 758          * @param OutputPage $output OutputPage to use
 759          */
 760         protected function showLogFragment( $user, $output ) {
 761                 $rightsLogPage = new LogPage( 'rights' );
 762                 $output->addHTML( Xml::element( 'h2', null, $rightsLogPage->getName()->text() ) );
 763                 LogEventsList::showLogExtract( $output, 'rights', $user->getUserPage() );
 764         }
 765
 766         /**
 767          * Return an array of subpages beginning with $search that this special page will accept.
 768          *
 769          * @param string $search Prefix to search for
 770          * @param int $limit Maximum number of results to return (usually 10)
 771          * @param int $offset Number of results to skip (usually 0)
 772          * @return string[] Matching subpages
 773          */
 774         public function prefixSearchSubpages( $search, $limit, $offset ) {
 775                 $user = User::newFromName( $search );
 776                 if ( !$user ) {
 777                         // No prefix suggestion for invalid user
 778                         return [];
 779                 }
 780                 // Autocomplete subpage as user list - public to allow caching
 781                 return UserNamePrefixSearch::search( 'public', $search, $limit, $offset );
 782         }
 783
 784         protected function getGroupName() {
 785                 return 'users';
 786         }
 787 }
 788