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                 $fetchedStatus = $this->fetchUser( $this->mTarget, true );
  92                 if ( $fetchedStatus->isOK() ) {
  93                         $this->mFetchedUser = $fetchedStatus->value;
  94                         if ( $this->mFetchedUser instanceof User ) {
  95                                 // Set the 'relevant user' in the skin, so it displays links like Contributions,
  96                                 // User logs, UserRights, etc.
  97                                 $this->getSkin()->setRelevantUser( $this->mFetchedUser );
  98                         }
  99                 }
 100
 101                 // show a successbox, if the user rights was saved successfully
 102                 if ( $request->getCheck( 'success' ) && $this->mFetchedUser !== null ) {
 103                         $out->addModules( [ 'mediawiki.special.userrights' ] );
 104                         $out->addModuleStyles( 'mediawiki.notification.convertmessagebox.styles' );
 105                         $out->addHTML(
 106                                 Html::rawElement(
 107                                         'div',
 108                                         [
 109                                                 'class' => 'mw-notify-success successbox',
 110                                                 'id' => 'mw-preferences-success',
 111                                                 'data-mw-autohide' => 'false',
 112                                         ],
 113                                         Html::element(
 114                                                 'p',
 115                                                 [],
 116                                                 $this->msg( 'savedrights', $this->mFetchedUser->getName() )->text()
 117                                         )
 118                                 )
 119                         );
 120                 }
 121
 122                 $this->setHeaders();
 123                 $this->outputHeader();
 124
 125                 $out->addModuleStyles( 'mediawiki.special' );
 126                 $this->addHelpLink( 'Help:Assigning permissions' );
 127
 128                 $this->switchForm();
 129
 130                 if (
 131                         $request->wasPosted() &&
 132                         $request->getCheck( 'saveusergroups' ) &&
 133                         $this->mTarget !== null &&
 134                         $user->matchEditToken( $request->getVal( 'wpEditToken' ), $this->mTarget )
 135                 ) {
 136                         /*
 137                         * If the user is blocked and they only have "partial" access
 138                         * (e.g. they don't have the userrights permission), then don't
 139                         * allow them to change any user rights.
 140                         */
 141                         if ( $user->isBlocked() && !$user->isAllowed( 'userrights' ) ) {
 142                                 throw new UserBlockedError( $user->getBlock() );
 143                         }
 144
 145                         $this->checkReadOnly();
 146
 147                         // save settings
 148                         if ( !$fetchedStatus->isOK() ) {
 149                                 $this->getOutput()->addWikiText( $fetchedStatus->getWikiText() );
 150
 151                                 return;
 152                         }
 153
 154                         $targetUser = $this->mFetchedUser;
 155                         if ( $targetUser instanceof User ) { // UserRightsProxy doesn't have this method (bug 61252)
 156                                 $targetUser->clearInstanceCache(); // bug 38989
 157                         }
 158
 159                         if ( $request->getVal( 'conflictcheck-originalgroups' )
 160                                 !== implode( ',', $targetUser->getGroups() )
 161                         ) {
 162                                 $out->addWikiMsg( 'userrights-conflict' );
 163                         } else {
 164                                 $this->saveUserGroups(
 165                                         $this->mTarget,
 166                                         $request->getVal( 'user-reason' ),
 167                                         $targetUser
 168                                 );
 169
 170                                 $out->redirect( $this->getSuccessURL() );
 171
 172                                 return;
 173                         }
 174                 }
 175
 176                 // show some more forms
 177                 if ( $this->mTarget !== null ) {
 178                         $this->editUserGroupsForm( $this->mTarget );
 179                 }
 180         }
 181
 182         function getSuccessURL() {
 183                 return $this->getPageTitle( $this->mTarget )->getFullURL( [ 'success' => 1 ] );
 184         }
 185
 186         /**
 187          * Save user groups changes in the database.
 188          * Data comes from the editUserGroupsForm() form function
 189          *
 190          * @param string $username Username to apply changes to.
 191          * @param string $reason Reason for group change
 192          * @param User|UserRightsProxy $user Target user object.
 193          * @return null
 194          */
 195         function saveUserGroups( $username, $reason, $user ) {
 196                 $allgroups = $this->getAllGroups();
 197                 $addgroup = [];
 198                 $removegroup = [];
 199
 200                 // This could possibly create a highly unlikely race condition if permissions are changed between
 201                 //  when the form is loaded and when the form is saved. Ignoring it for the moment.
 202                 foreach ( $allgroups as $group ) {
 203                         // We'll tell it to remove all unchecked groups, and add all checked groups.
 204                         // Later on, this gets filtered for what can actually be removed
 205                         if ( $this->getRequest()->getCheck( "wpGroup-$group" ) ) {
 206                                 $addgroup[] = $group;
 207                         } else {
 208                                 $removegroup[] = $group;
 209                         }
 210                 }
 211
 212                 $this->doSaveUserGroups( $user, $addgroup, $removegroup, $reason );
 213         }
 214
 215         /**
 216          * Save user groups changes in the database.
 217          *
 218          * @param User|UserRightsProxy $user
 219          * @param array $add Array of groups to add
 220          * @param array $remove Array of groups to remove
 221          * @param string $reason Reason for group change
 222          * @return array Tuple of added, then removed groups
 223          */
 224         function doSaveUserGroups( $user, $add, $remove, $reason = '' ) {
 225                 // Validate input set...
 226                 $isself = $user->getName() == $this->getUser()->getName();
 227                 $groups = $user->getGroups();
 228                 $changeable = $this->changeableGroups();
 229                 $addable = array_merge( $changeable['add'], $isself ? $changeable['add-self'] : [] );
 230                 $removable = array_merge( $changeable['remove'], $isself ? $changeable['remove-self'] : [] );
 231
 232                 $remove = array_unique(
 233                         array_intersect( (array)$remove, $removable, $groups ) );
 234                 $add = array_unique( array_diff(
 235                         array_intersect( (array)$add, $addable ),
 236                         $groups )
 237                 );
 238
 239                 $oldGroups = $user->getGroups();
 240                 $newGroups = $oldGroups;
 241
 242                 // Remove then add groups
 243                 if ( $remove ) {
 244                         foreach ( $remove as $index => $group ) {
 245                                 if ( !$user->removeGroup( $group ) ) {
 246                                         unset( $remove[$index] );
 247                                 }
 248                         }
 249                         $newGroups = array_diff( $newGroups, $remove );
 250                 }
 251                 if ( $add ) {
 252                         foreach ( $add as $index => $group ) {
 253                                 if ( !$user->addGroup( $group ) ) {
 254                                         unset( $add[$index] );
 255                                 }
 256                         }
 257                         $newGroups = array_merge( $newGroups, $add );
 258                 }
 259                 $newGroups = array_unique( $newGroups );
 260
 261                 // Ensure that caches are cleared
 262                 $user->invalidateCache();
 263
 264                 // update groups in external authentication database
 265                 Hooks::run( 'UserGroupsChanged', [ $user, $add, $remove, $this->getUser(), $reason ] );
 266                 MediaWiki\Auth\AuthManager::callLegacyAuthPlugin(
 267                         'updateExternalDBGroups', [ $user, $add, $remove ]
 268                 );
 269
 270                 wfDebug( 'oldGroups: ' . print_r( $oldGroups, true ) . "\n" );
 271                 wfDebug( 'newGroups: ' . print_r( $newGroups, true ) . "\n" );
 272                 // Deprecated in favor of UserGroupsChanged hook
 273                 Hooks::run( 'UserRights', [ &$user, $add, $remove ], '1.26' );
 274
 275                 if ( $newGroups != $oldGroups ) {
 276                         $this->addLogEntry( $user, $oldGroups, $newGroups, $reason );
 277                 }
 278
 279                 return [ $add, $remove ];
 280         }
 281
 282         /**
 283          * Add a rights log entry for an action.
 284          * @param User $user
 285          * @param array $oldGroups
 286          * @param array $newGroups
 287          * @param array $reason
 288          */
 289         function addLogEntry( $user, $oldGroups, $newGroups, $reason ) {
 290                 $logEntry = new ManualLogEntry( 'rights', 'rights' );
 291                 $logEntry->setPerformer( $this->getUser() );
 292                 $logEntry->setTarget( $user->getUserPage() );
 293                 $logEntry->setComment( $reason );
 294                 $logEntry->setParameters( [
 295                         '4::oldgroups' => $oldGroups,
 296                         '5::newgroups' => $newGroups,
 297                 ] );
 298                 $logid = $logEntry->insert();
 299                 $logEntry->publish( $logid );
 300         }
 301
 302         /**
 303          * Edit user groups membership
 304          * @param string $username Name of the user.
 305          */
 306         function editUserGroupsForm( $username ) {
 307                 $status = $this->fetchUser( $username, true );
 308                 if ( !$status->isOK() ) {
 309                         $this->getOutput()->addWikiText( $status->getWikiText() );
 310
 311                         return;
 312                 } else {
 313                         $user = $status->value;
 314                 }
 315
 316                 $groups = $user->getGroups();
 317
 318                 $this->showEditUserGroupsForm( $user, $groups );
 319
 320                 // This isn't really ideal logging behavior, but let's not hide the
 321                 // interwiki logs if we're using them as is.
 322                 $this->showLogFragment( $user, $this->getOutput() );
 323         }
 324
 325         /**
 326          * Normalize the input username, which may be local or remote, and
 327          * return a user (or proxy) object for manipulating it.
 328          *
 329          * Side effects: error output for invalid access
 330          * @param string $username
 331          * @param bool $writing
 332          * @return Status
 333          */
 334         public function fetchUser( $username, $writing = true ) {
 335                 $parts = explode( $this->getConfig()->get( 'UserrightsInterwikiDelimiter' ), $username );
 336                 if ( count( $parts ) < 2 ) {
 337                         $name = trim( $username );
 338                         $database = '';
 339                 } else {
 340                         list( $name, $database ) = array_map( 'trim', $parts );
 341
 342                         if ( $database == wfWikiID() ) {
 343                                 $database = '';
 344                         } else {
 345                                 if ( $writing && !$this->getUser()->isAllowed( 'userrights-interwiki' ) ) {
 346                                         return Status::newFatal( 'userrights-no-interwiki' );
 347                                 }
 348                                 if ( !UserRightsProxy::validDatabase( $database ) ) {
 349                                         return Status::newFatal( 'userrights-nodatabase', $database );
 350                                 }
 351                         }
 352                 }
 353
 354                 if ( $name === '' ) {
 355                         return Status::newFatal( 'nouserspecified' );
 356                 }
 357
 358                 if ( $name[0] == '#' ) {
 359                         // Numeric ID can be specified...
 360                         // We'll do a lookup for the name internally.
 361                         $id = intval( substr( $name, 1 ) );
 362
 363                         if ( $database == '' ) {
 364                                 $name = User::whoIs( $id );
 365                         } else {
 366                                 $name = UserRightsProxy::whoIs( $database, $id );
 367                         }
 368
 369                         if ( !$name ) {
 370                                 return Status::newFatal( 'noname' );
 371                         }
 372                 } else {
 373                         $name = User::getCanonicalName( $name );
 374                         if ( $name === false ) {
 375                                 // invalid name
 376                                 return Status::newFatal( 'nosuchusershort', $username );
 377                         }
 378                 }
 379
 380                 if ( $database == '' ) {
 381                         $user = User::newFromName( $name );
 382                 } else {
 383                         $user = UserRightsProxy::newFromName( $database, $name );
 384                 }
 385
 386                 if ( !$user || $user->isAnon() ) {
 387                         return Status::newFatal( 'nosuchusershort', $username );
 388                 }
 389
 390                 return Status::newGood( $user );
 391         }
 392
 393         /**
 394          * @since 1.15
 395          *
 396          * @param array $ids
 397          *
 398          * @return string
 399          */
 400         public function makeGroupNameList( $ids ) {
 401                 if ( empty( $ids ) ) {
 402                         return $this->msg( 'rightsnone' )->inContentLanguage()->text();
 403                 } else {
 404                         return implode( ', ', $ids );
 405                 }
 406         }
 407
 408         /**
 409          * Output a form to allow searching for a user
 410          */
 411         function switchForm() {
 412                 $this->getOutput()->addModules( 'mediawiki.userSuggest' );
 413
 414                 $this->getOutput()->addHTML(
 415                         Html::openElement(
 416                                 'form',
 417                                 [
 418                                         'method' => 'get',
 419                                         'action' => wfScript(),
 420                                         'name' => 'uluser',
 421                                         'id' => 'mw-userrights-form1'
 422                                 ]
 423                         ) .
 424                         Html::hidden( 'title', $this->getPageTitle()->getPrefixedText() ) .
 425                         Xml::fieldset( $this->msg( 'userrights-lookup-user' )->text() ) .
 426                         Xml::inputLabel(
 427                                 $this->msg( 'userrights-user-editname' )->text(),
 428                                 'user',
 429                                 'username',
 430                                 30,
 431                                 str_replace( '_', ' ', $this->mTarget ),
 432                                 [
 433                                         'class' => 'mw-autocomplete-user', // used by mediawiki.userSuggest
 434                                 ] + (
 435                                         // Set autofocus on blank input and error input
 436                                         $this->mFetchedUser === null ? [ 'autofocus' => '' ] : []
 437                                 )
 438                         ) . ' ' .
 439                         Xml::submitButton(
 440                                 $this->msg( 'editusergroup' )->text()
 441                         ) .
 442                         Html::closeElement( 'fieldset' ) .
 443                         Html::closeElement( 'form' ) . "\n"
 444                 );
 445         }
 446
 447         /**
 448          * Go through used and available groups and return the ones that this
 449          * form will be able to manipulate based on the current user's system
 450          * permissions.
 451          *
 452          * @param array $groups List of groups the given user is in
 453          * @return array Tuple of addable, then removable groups
 454          */
 455         protected function splitGroups( $groups ) {
 456                 list( $addable, $removable, $addself, $removeself ) = array_values( $this->changeableGroups() );
 457
 458                 $removable = array_intersect(
 459                         array_merge( $this->isself ? $removeself : [], $removable ),
 460                         $groups
 461                 ); // Can't remove groups the user doesn't have
 462                 $addable = array_diff(
 463                         array_merge( $this->isself ? $addself : [], $addable ),
 464                         $groups
 465                 ); // Can't add groups the user does have
 466
 467                 return [ $addable, $removable ];
 468         }
 469
 470         /**
 471          * Show the form to edit group memberships.
 472          *
 473          * @param User|UserRightsProxy $user User or UserRightsProxy you're editing
 474          * @param array $groups Array of groups the user is in
 475          */
 476         protected function showEditUserGroupsForm( $user, $groups ) {
 477                 $list = [];
 478                 $membersList = [];
 479                 foreach ( $groups as $group ) {
 480                         $list[] = self::buildGroupLink( $group );
 481                         $membersList[] = self::buildGroupMemberLink( $group );
 482                 }
 483
 484                 $autoList = [];
 485                 $autoMembersList = [];
 486                 if ( $user instanceof User ) {
 487                         foreach ( Autopromote::getAutopromoteGroups( $user ) as $group ) {
 488                                 $autoList[] = self::buildGroupLink( $group );
 489                                 $autoMembersList[] = self::buildGroupMemberLink( $group );
 490                         }
 491                 }
 492
 493                 $language = $this->getLanguage();
 494                 $displayedList = $this->msg( 'userrights-groupsmember-type' )
 495                         ->rawParams(
 496                                 $language->listToText( $list ),
 497                                 $language->listToText( $membersList )
 498                         )->escaped();
 499                 $displayedAutolist = $this->msg( 'userrights-groupsmember-type' )
 500                         ->rawParams(
 501                                 $language->listToText( $autoList ),
 502                                 $language->listToText( $autoMembersList )
 503                         )->escaped();
 504
 505                 $grouplist = '';
 506                 $count = count( $list );
 507                 if ( $count > 0 ) {
 508                         $grouplist = $this->msg( 'userrights-groupsmember' )
 509                                 ->numParams( $count )
 510                                 ->params( $user->getName() )
 511                                 ->parse();
 512                         $grouplist = '<p>' . $grouplist . ' ' . $displayedList . "</p>\n";
 513                 }
 514
 515                 $count = count( $autoList );
 516                 if ( $count > 0 ) {
 517                         $autogrouplistintro = $this->msg( 'userrights-groupsmember-auto' )
 518                                 ->numParams( $count )
 519                                 ->params( $user->getName() )
 520                                 ->parse();
 521                         $grouplist .= '<p>' . $autogrouplistintro . ' ' . $displayedAutolist . "</p>\n";
 522                 }
 523
 524                 $userToolLinks = Linker::userToolLinks(
 525                         $user->getId(),
 526                         $user->getName(),
 527                         false, /* default for redContribsWhenNoEdits */
 528                         Linker::TOOL_LINKS_EMAIL /* Add "send e-mail" link */
 529                 );
 530
 531                 list( $groupCheckboxes, $canChangeAny ) = $this->groupCheckboxes( $groups, $user );
 532                 $this->getOutput()->addHTML(
 533                         Xml::openElement(
 534                                 'form',
 535                                 [
 536                                         'method' => 'post',
 537                                         'action' => $this->getPageTitle()->getLocalURL(),
 538                                         'name' => 'editGroup',
 539                                         'id' => 'mw-userrights-form2'
 540                                 ]
 541                         ) .
 542                         Html::hidden( 'user', $this->mTarget ) .
 543                         Html::hidden( 'wpEditToken', $this->getUser()->getEditToken( $this->mTarget ) ) .
 544                         Html::hidden(
 545                                 'conflictcheck-originalgroups',
 546                                 implode( ',', $user->getGroups() )
 547                         ) . // Conflict detection
 548                         Xml::openElement( 'fieldset' ) .
 549                         Xml::element(
 550                                 'legend',
 551                                 [],
 552                                 $this->msg(
 553                                         $canChangeAny ? 'userrights-editusergroup' : 'userrights-viewusergroup',
 554                                         $user->getName()
 555                                 )->text()
 556                         ) .
 557                         $this->msg(
 558                                 $canChangeAny ? 'editinguser' : 'viewinguserrights'
 559                         )->params( wfEscapeWikiText( $user->getName() ) )
 560                                 ->rawParams( $userToolLinks )->parse()
 561                 );
 562                 if ( $canChangeAny ) {
 563                         $this->getOutput()->addHTML(
 564                                 $this->msg( 'userrights-groups-help', $user->getName() )->parse() .
 565                                 $grouplist .
 566                                 $groupCheckboxes .
 567                                 Xml::openElement( 'table', [ 'id' => 'mw-userrights-table-outer' ] ) .
 568                                         "<tr>
 569                                                 <td class='mw-label'>" .
 570                                                         Xml::label( $this->msg( 'userrights-reason' )->text(), 'wpReason' ) .
 571                                                 "</td>
 572                                                 <td class='mw-input'>" .
 573                                                         Xml::input( 'user-reason', 60, $this->getRequest()->getVal( 'user-reason', false ),
 574                                                                 [ 'id' => 'wpReason', 'maxlength' => 255 ] ) .
 575                                                 "</td>
 576                                         </tr>
 577                                         <tr>
 578                                                 <td></td>
 579                                                 <td class='mw-submit'>" .
 580                                                         Xml::submitButton( $this->msg( 'saveusergroups', $user->getName() )->text(),
 581                                                                 [ 'name' => 'saveusergroups' ] +
 582                                                                         Linker::tooltipAndAccesskeyAttribs( 'userrights-set' )
 583                                                         ) .
 584                                                 "</td>
 585                                         </tr>" .
 586                                 Xml::closeElement( 'table' ) . "\n"
 587                         );
 588                 } else {
 589                         $this->getOutput()->addHTML( $grouplist );
 590                 }
 591                 $this->getOutput()->addHTML(
 592                         Xml::closeElement( 'fieldset' ) .
 593                         Xml::closeElement( 'form' ) . "\n"
 594                 );
 595         }
 596
 597         /**
 598          * Format a link to a group description page
 599          *
 600          * @param string $group
 601          * @return string
 602          */
 603         private static function buildGroupLink( $group ) {
 604                 return User::makeGroupLinkHTML( $group, User::getGroupName( $group ) );
 605         }
 606
 607         /**
 608          * Format a link to a group member description page
 609          *
 610          * @param string $group
 611          * @return string
 612          */
 613         private static function buildGroupMemberLink( $group ) {
 614                 return User::makeGroupLinkHTML( $group, User::getGroupMember( $group ) );
 615         }
 616
 617         /**
 618          * Returns an array of all groups that may be edited
 619          * @return array Array of groups that may be edited.
 620          */
 621         protected static function getAllGroups() {
 622                 return User::getAllGroups();
 623         }
 624
 625         /**
 626          * Adds a table with checkboxes where you can select what groups to add/remove
 627          *
 628          * @todo Just pass the username string?
 629          * @param array $usergroups Groups the user belongs to
 630          * @param User $user
 631          * @return Array with 2 elements: the XHTML table element with checkxboes, and
 632          * whether any groups are changeable
 633          */
 634         private function groupCheckboxes( $usergroups, $user ) {
 635                 $allgroups = $this->getAllGroups();
 636                 $ret = '';
 637
 638                 // Put all column info into an associative array so that extensions can
 639                 // more easily manage it.
 640                 $columns = [ 'unchangeable' => [], 'changeable' => [] ];
 641
 642                 foreach ( $allgroups as $group ) {
 643                         $set = in_array( $group, $usergroups );
 644                         // Should the checkbox be disabled?
 645                         $disabled = !(
 646                                 ( $set && $this->canRemove( $group ) ) ||
 647                                 ( !$set && $this->canAdd( $group ) ) );
 648                         // Do we need to point out that this action is irreversible?
 649                         $irreversible = !$disabled && (
 650                                 ( $set && !$this->canAdd( $group ) ) ||
 651                                 ( !$set && !$this->canRemove( $group ) ) );
 652
 653                         $checkbox = [
 654                                 'set' => $set,
 655                                 'disabled' => $disabled,
 656                                 'irreversible' => $irreversible
 657                         ];
 658
 659                         if ( $disabled ) {
 660                                 $columns['unchangeable'][$group] = $checkbox;
 661                         } else {
 662                                 $columns['changeable'][$group] = $checkbox;
 663                         }
 664                 }
 665
 666                 // Build the HTML table
 667                 $ret .= Xml::openElement( 'table', [ 'class' => 'mw-userrights-groups' ] ) .
 668                         "<tr>\n";
 669                 foreach ( $columns as $name => $column ) {
 670                         if ( $column === [] ) {
 671                                 continue;
 672                         }
 673                         // Messages: userrights-changeable-col, userrights-unchangeable-col
 674                         $ret .= Xml::element(
 675                                 'th',
 676                                 null,
 677                                 $this->msg( 'userrights-' . $name . '-col', count( $column ) )->text()
 678                         );
 679                 }
 680
 681                 $ret .= "</tr>\n<tr>\n";
 682                 foreach ( $columns as $column ) {
 683                         if ( $column === [] ) {
 684                                 continue;
 685                         }
 686                         $ret .= "\t<td style='vertical-align:top;'>\n";
 687                         foreach ( $column as $group => $checkbox ) {
 688                                 $attr = $checkbox['disabled'] ? [ 'disabled' => 'disabled' ] : [];
 689
 690                                 $member = User::getGroupMember( $group, $user->getName() );
 691                                 if ( $checkbox['irreversible'] ) {
 692                                         $text = $this->msg( 'userrights-irreversible-marker', $member )->text();
 693                                 } else {
 694                                         $text = $member;
 695                                 }
 696                                 $checkboxHtml = Xml::checkLabel( $text, "wpGroup-" . $group,
 697                                         "wpGroup-" . $group, $checkbox['set'], $attr );
 698                                 $ret .= "\t\t" . ( $checkbox['disabled']
 699                                         ? Xml::tags( 'span', [ 'class' => 'mw-userrights-disabled' ], $checkboxHtml )
 700                                         : $checkboxHtml
 701                                 ) . "<br />\n";
 702                         }
 703                         $ret .= "\t</td>\n";
 704                 }
 705                 $ret .= Xml::closeElement( 'tr' ) . Xml::closeElement( 'table' );
 706
 707                 return [ $ret, (bool)$columns['changeable'] ];
 708         }
 709
 710         /**
 711          * @param string $group The name of the group to check
 712          * @return bool Can we remove the group?
 713          */
 714         private function canRemove( $group ) {
 715                 $groups = $this->changeableGroups();
 716
 717                 return in_array(
 718                         $group,
 719                         $groups['remove'] ) || ( $this->isself && in_array( $group, $groups['remove-self'] )
 720                 );
 721         }
 722
 723         /**
 724          * @param string $group The name of the group to check
 725          * @return bool Can we add the group?
 726          */
 727         private function canAdd( $group ) {
 728                 $groups = $this->changeableGroups();
 729
 730                 return in_array(
 731                         $group,
 732                         $groups['add'] ) || ( $this->isself && in_array( $group, $groups['add-self'] )
 733                 );
 734         }
 735
 736         /**
 737          * Returns $this->getUser()->changeableGroups()
 738          *
 739          * @return array Array(
 740          *   'add' => array( addablegroups ),
 741          *   'remove' => array( removablegroups ),
 742          *   'add-self' => array( addablegroups to self ),
 743          *   'remove-self' => array( removable groups from self )
 744          *  )
 745          */
 746         function changeableGroups() {
 747                 return $this->getUser()->changeableGroups();
 748         }
 749
 750         /**
 751          * Show a rights log fragment for the specified user
 752          *
 753          * @param User $user User to show log for
 754          * @param OutputPage $output OutputPage to use
 755          */
 756         protected function showLogFragment( $user, $output ) {
 757                 $rightsLogPage = new LogPage( 'rights' );
 758                 $output->addHTML( Xml::element( 'h2', null, $rightsLogPage->getName()->text() ) );
 759                 LogEventsList::showLogExtract( $output, 'rights', $user->getUserPage() );
 760         }
 761
 762         /**
 763          * Return an array of subpages beginning with $search that this special page will accept.
 764          *
 765          * @param string $search Prefix to search for
 766          * @param int $limit Maximum number of results to return (usually 10)
 767          * @param int $offset Number of results to skip (usually 0)
 768          * @return string[] Matching subpages
 769          */
 770         public function prefixSearchSubpages( $search, $limit, $offset ) {
 771                 $user = User::newFromName( $search );
 772                 if ( !$user ) {
 773                         // No prefix suggestion for invalid user
 774                         return [];
 775                 }
 776                 // Autocomplete subpage as user list - public to allow caching
 777                 return UserNamePrefixSearch::search( 'public', $search, $limit, $offset );
 778         }
 779
 780         protected function getGroupName() {
 781                 return 'users';
 782         }
 783 }
 784