includes/specials/SpecialUserrights.php

   1 <?php
   2 /**
   3  * Implements Special:Userrights
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup SpecialPage
  22  */
  23
  24 /**
  25  * Special page to allow managing user group membership
  26  *
  27  * @ingroup SpecialPage
  28  */
  29 class UserrightsPage extends SpecialPage {
  30         # The target of the local right-adjuster's interest.  Can be gotten from
  31         # either a GET parameter or a subpage-style parameter, so have a member
  32         # variable for it.
  33         protected $mTarget;
  34         protected $isself = false;
  35
  36         public function __construct() {
  37                 parent::__construct( 'Userrights' );
  38         }
  39
  40         public function isRestricted() {
  41                 return true;
  42         }
  43
  44         public function userCanExecute( User $user ) {
  45                 return $this->userCanChangeRights( $user, false );
  46         }
  47
  48         /**
  49          * @param User $user
  50          * @param bool $checkIfSelf
  51          * @return bool
  52          */
  53         public function userCanChangeRights( $user, $checkIfSelf = true ) {
  54                 $available = $this->changeableGroups();
  55                 if ( $user->getId() == 0 ) {
  56                         return false;
  57                 }
  58                 return !empty( $available['add'] )
  59                         || !empty( $available['remove'] )
  60                         || ( ( $this->isself || !$checkIfSelf ) &&
  61                                 ( !empty( $available['add-self'] )
  62                                         || !empty( $available['remove-self'] ) ) );
  63         }
  64
  65         /**
  66          * Manage forms to be shown according to posted data.
  67          * Depending on the submit button used, call a form or a save function.
  68          *
  69          * @param $par Mixed: string if any subpage provided, else null
  70          * @throws UserBlockedError|PermissionsError
  71          */
  72         public function execute( $par ) {
  73                 // If the visitor doesn't have permissions to assign or remove
  74                 // any groups, it's a bit silly to give them the user search prompt.
  75
  76                 $user = $this->getUser();
  77
  78                 /*
  79                  * If the user is blocked and they only have "partial" access
  80                  * (e.g. they don't have the userrights permission), then don't
  81                  * allow them to use Special:UserRights.
  82                  */
  83                 if ( $user->isBlocked() && !$user->isAllowed( 'userrights' ) ) {
  84                         throw new UserBlockedError( $user->getBlock() );
  85                 }
  86
  87                 $request = $this->getRequest();
  88
  89                 if ( $par !== null ) {
  90                         $this->mTarget = $par;
  91                 } else {
  92                         $this->mTarget = $request->getVal( 'user' );
  93                 }
  94
  95                 $available = $this->changeableGroups();
  96
  97                 if ( $this->mTarget === null ) {
  98                         /*
  99                          * If the user specified no target, and they can only
 100                          * edit their own groups, automatically set them as the
 101                          * target.
 102                          */
 103                         if ( !count( $available['add'] ) && !count( $available['remove'] ) ) {
 104                                 $this->mTarget = $user->getName();
 105                         }
 106                 }
 107
 108                 if ( User::getCanonicalName( $this->mTarget ) == $user->getName() ) {
 109                         $this->isself = true;
 110                 }
 111
 112                 if ( !$this->userCanChangeRights( $user, true ) ) {
 113                         if ( $this->isself && $request->getCheck( 'success' ) ) {
 114                                 // bug 48609: if the user just removed its own rights, this would
 115                                 // leads it in a "permissions error" page. In that case, show a
 116                                 // message that it can't anymore use this page instead of an error
 117                                 $this->setHeaders();
 118                                 $out = $this->getOutput();
 119                                 $out->wrapWikiMsg( "<div class=\"successbox\">\n$1\n</div>", 'userrights-removed-self' );
 120                                 $out->returnToMain();
 121                                 return;
 122                         }
 123
 124                         // @todo FIXME: There may be intermediate groups we can mention.
 125                         $msg = $user->isAnon() ? 'userrights-nologin' : 'userrights-notallowed';
 126                         throw new PermissionsError( null, array( array( $msg ) ) );
 127                 }
 128
 129                 $this->checkReadOnly();
 130
 131                 $this->setHeaders();
 132                 $this->outputHeader();
 133
 134                 $out = $this->getOutput();
 135                 $out->addModuleStyles( 'mediawiki.special' );
 136
 137                 // show the general form
 138                 if ( count( $available['add'] ) || count( $available['remove'] ) ) {
 139                         $this->switchForm();
 140                 }
 141
 142                 if (
 143                         $request->wasPosted() &&
 144                         $request->getCheck( 'saveusergroups' ) &&
 145                         $user->matchEditToken( $request->getVal( 'wpEditToken' ), $this->mTarget )
 146                 ) {
 147                         // save settings
 148                         $status = $this->fetchUser( $this->mTarget );
 149                         if ( !$status->isOK() ) {
 150                                 $this->getOutput()->addWikiText( $status->getWikiText() );
 151                                 return;
 152                         }
 153
 154                         $targetUser = $status->value;
 155
 156                         if ( $request->getVal( 'conflictcheck-originalgroups' ) !== implode( ',', $targetUser->getGroups() ) ) {
 157                                 $out->addWikiMsg( 'userrights-conflict' );
 158                         } else {
 159                                 $this->saveUserGroups(
 160                                         $this->mTarget,
 161                                         $request->getVal( 'user-reason' ),
 162                                         $targetUser
 163                                 );
 164
 165                                 $out->redirect( $this->getSuccessURL() );
 166                                 return;
 167                         }
 168                 }
 169
 170                 // show some more forms
 171                 if ( $this->mTarget !== null ) {
 172                         $this->editUserGroupsForm( $this->mTarget );
 173                 }
 174         }
 175
 176         function getSuccessURL() {
 177                 return $this->getTitle( $this->mTarget )->getFullURL( array( 'success' => 1 ) );
 178         }
 179
 180         /**
 181          * Save user groups changes in the database.
 182          * Data comes from the editUserGroupsForm() form function
 183          *
 184          * @param string $username username to apply changes to.
 185          * @param string $reason reason for group change
 186          * @param User|UserRightsProxy $user Target user object.
 187          * @return null
 188          */
 189         function saveUserGroups( $username, $reason, $user ) {
 190                 $allgroups = $this->getAllGroups();
 191                 $addgroup = array();
 192                 $removegroup = array();
 193
 194                 // This could possibly create a highly unlikely race condition if permissions are changed between
 195                 //  when the form is loaded and when the form is saved. Ignoring it for the moment.
 196                 foreach ( $allgroups as $group ) {
 197                         // We'll tell it to remove all unchecked groups, and add all checked groups.
 198                         // Later on, this gets filtered for what can actually be removed
 199                         if ( $this->getRequest()->getCheck( "wpGroup-$group" ) ) {
 200                                 $addgroup[] = $group;
 201                         } else {
 202                                 $removegroup[] = $group;
 203                         }
 204                 }
 205
 206                 $this->doSaveUserGroups( $user, $addgroup, $removegroup, $reason );
 207         }
 208
 209         /**
 210          * Save user groups changes in the database.
 211          *
 212          * @param $user User object
 213          * @param array $add of groups to add
 214          * @param array $remove of groups to remove
 215          * @param string $reason reason for group change
 216          * @return Array: Tuple of added, then removed groups
 217          */
 218         function doSaveUserGroups( $user, $add, $remove, $reason = '' ) {
 219                 global $wgAuth;
 220
 221                 // Validate input set...
 222                 $isself = ( $user->getName() == $this->getUser()->getName() );
 223                 $groups = $user->getGroups();
 224                 $changeable = $this->changeableGroups();
 225                 $addable = array_merge( $changeable['add'], $isself ? $changeable['add-self'] : array() );
 226                 $removable = array_merge( $changeable['remove'], $isself ? $changeable['remove-self'] : array() );
 227
 228                 $remove = array_unique(
 229                         array_intersect( (array)$remove, $removable, $groups ) );
 230                 $add = array_unique( array_diff(
 231                         array_intersect( (array)$add, $addable ),
 232                         $groups )
 233                 );
 234
 235                 $oldGroups = $user->getGroups();
 236                 $newGroups = $oldGroups;
 237
 238                 // remove then add groups
 239                 if ( $remove ) {
 240                         $newGroups = array_diff( $newGroups, $remove );
 241                         foreach ( $remove as $group ) {
 242                                 $user->removeGroup( $group );
 243                         }
 244                 }
 245                 if ( $add ) {
 246                         $newGroups = array_merge( $newGroups, $add );
 247                         foreach ( $add as $group ) {
 248                                 $user->addGroup( $group );
 249                         }
 250                 }
 251                 $newGroups = array_unique( $newGroups );
 252
 253                 // Ensure that caches are cleared
 254                 $user->invalidateCache();
 255
 256                 // update groups in external authentication database
 257                 $wgAuth->updateExternalDBGroups( $user, $add, $remove );
 258
 259                 wfDebug( 'oldGroups: ' . print_r( $oldGroups, true ) );
 260                 wfDebug( 'newGroups: ' . print_r( $newGroups, true ) );
 261                 wfRunHooks( 'UserRights', array( &$user, $add, $remove ) );
 262
 263                 if ( $newGroups != $oldGroups ) {
 264                         $this->addLogEntry( $user, $oldGroups, $newGroups, $reason );
 265                 }
 266                 return array( $add, $remove );
 267         }
 268
 269         /**
 270          * Add a rights log entry for an action.
 271          */
 272         function addLogEntry( $user, $oldGroups, $newGroups, $reason ) {
 273                 $logEntry = new ManualLogEntry( 'rights', 'rights' );
 274                 $logEntry->setPerformer( $this->getUser() );
 275                 $logEntry->setTarget( $user->getUserPage() );
 276                 $logEntry->setComment( $reason );
 277                 $logEntry->setParameters( array(
 278                         '4::oldgroups' => $oldGroups,
 279                         '5::newgroups' => $newGroups,
 280                 ) );
 281                 $logid = $logEntry->insert();
 282                 $logEntry->publish( $logid );
 283         }
 284
 285         /**
 286          * Edit user groups membership
 287          * @param string $username name of the user.
 288          */
 289         function editUserGroupsForm( $username ) {
 290                 $status = $this->fetchUser( $username );
 291                 if ( !$status->isOK() ) {
 292                         $this->getOutput()->addWikiText( $status->getWikiText() );
 293                         return;
 294                 } else {
 295                         $user = $status->value;
 296                 }
 297
 298                 $groups = $user->getGroups();
 299
 300                 $this->showEditUserGroupsForm( $user, $groups );
 301
 302                 // This isn't really ideal logging behavior, but let's not hide the
 303                 // interwiki logs if we're using them as is.
 304                 $this->showLogFragment( $user, $this->getOutput() );
 305         }
 306
 307         /**
 308          * Normalize the input username, which may be local or remote, and
 309          * return a user (or proxy) object for manipulating it.
 310          *
 311          * Side effects: error output for invalid access
 312          * @param string $username
 313          * @return Status object
 314          */
 315         public function fetchUser( $username ) {
 316                 global $wgUserrightsInterwikiDelimiter;
 317
 318                 $parts = explode( $wgUserrightsInterwikiDelimiter, $username );
 319                 if ( count( $parts ) < 2 ) {
 320                         $name = trim( $username );
 321                         $database = '';
 322                 } else {
 323                         list( $name, $database ) = array_map( 'trim', $parts );
 324
 325                         if ( $database == wfWikiID() ) {
 326                                 $database = '';
 327                         } else {
 328                                 if ( !$this->getUser()->isAllowed( 'userrights-interwiki' ) ) {
 329                                         return Status::newFatal( 'userrights-no-interwiki' );
 330                                 }
 331                                 if ( !UserRightsProxy::validDatabase( $database ) ) {
 332                                         return Status::newFatal( 'userrights-nodatabase', $database );
 333                                 }
 334                         }
 335                 }
 336
 337                 if ( $name === '' ) {
 338                         return Status::newFatal( 'nouserspecified' );
 339                 }
 340
 341                 if ( $name[0] == '#' ) {
 342                         // Numeric ID can be specified...
 343                         // We'll do a lookup for the name internally.
 344                         $id = intval( substr( $name, 1 ) );
 345
 346                         if ( $database == '' ) {
 347                                 $name = User::whoIs( $id );
 348                         } else {
 349                                 $name = UserRightsProxy::whoIs( $database, $id );
 350                         }
 351
 352                         if ( !$name ) {
 353                                 return Status::newFatal( 'noname' );
 354                         }
 355                 } else {
 356                         $name = User::getCanonicalName( $name );
 357                         if ( $name === false ) {
 358                                 // invalid name
 359                                 return Status::newFatal( 'nosuchusershort', $username );
 360                         }
 361                 }
 362
 363                 if ( $database == '' ) {
 364                         $user = User::newFromName( $name );
 365                 } else {
 366                         $user = UserRightsProxy::newFromName( $database, $name );
 367                 }
 368
 369                 if ( !$user || $user->isAnon() ) {
 370                         return Status::newFatal( 'nosuchusershort', $username );
 371                 }
 372
 373                 return Status::newGood( $user );
 374         }
 375
 376         function makeGroupNameList( $ids ) {
 377                 if ( empty( $ids ) ) {
 378                         return $this->msg( 'rightsnone' )->inContentLanguage()->text();
 379                 } else {
 380                         return implode( ', ', $ids );
 381                 }
 382         }
 383
 384         /**
 385          * Make a list of group names to be stored as parameter for log entries
 386          *
 387          * @deprecated in 1.21; use LogFormatter instead.
 388          * @param $ids array
 389          * @return string
 390          */
 391         function makeGroupNameListForLog( $ids ) {
 392                 wfDeprecated( __METHOD__, '1.21' );
 393
 394                 if ( empty( $ids ) ) {
 395                         return '';
 396                 } else {
 397                         return $this->makeGroupNameList( $ids );
 398                 }
 399         }
 400
 401         /**
 402          * Output a form to allow searching for a user
 403          */
 404         function switchForm() {
 405                 global $wgScript;
 406                 $this->getOutput()->addHTML(
 407                         Html::openElement( 'form', array( 'method' => 'get', 'action' => $wgScript, 'name' => 'uluser', 'id' => 'mw-userrights-form1' ) ) .
 408                         Html::hidden( 'title', $this->getTitle()->getPrefixedText() ) .
 409                         Xml::fieldset( $this->msg( 'userrights-lookup-user' )->text() ) .
 410                         Xml::inputLabel( $this->msg( 'userrights-user-editname' )->text(), 'user', 'username', 30, str_replace( '_', ' ', $this->mTarget ), array( 'autofocus' => true ) ) . ' ' .
 411                         Xml::submitButton( $this->msg( 'editusergroup' )->text() ) .
 412                         Html::closeElement( 'fieldset' ) .
 413                         Html::closeElement( 'form' ) . "\n"
 414                 );
 415         }
 416
 417         /**
 418          * Go through used and available groups and return the ones that this
 419          * form will be able to manipulate based on the current user's system
 420          * permissions.
 421          *
 422          * @param array $groups list of groups the given user is in
 423          * @return Array:  Tuple of addable, then removable groups
 424          */
 425         protected function splitGroups( $groups ) {
 426                 list( $addable, $removable, $addself, $removeself ) = array_values( $this->changeableGroups() );
 427
 428                 $removable = array_intersect(
 429                         array_merge( $this->isself ? $removeself : array(), $removable ),
 430                         $groups
 431                 ); // Can't remove groups the user doesn't have
 432                 $addable = array_diff(
 433                         array_merge( $this->isself ? $addself : array(), $addable ),
 434                         $groups
 435                 ); // Can't add groups the user does have
 436
 437                 return array( $addable, $removable );
 438         }
 439
 440         /**
 441          * Show the form to edit group memberships.
 442          *
 443          * @param $user      User or UserRightsProxy you're editing
 444          * @param $groups    Array:  Array of groups the user is in
 445          */
 446         protected function showEditUserGroupsForm( $user, $groups ) {
 447                 $list = array();
 448                 $membersList = array();
 449                 foreach ( $groups as $group ) {
 450                         $list[] = self::buildGroupLink( $group );
 451                         $membersList[] = self::buildGroupMemberLink( $group );
 452                 }
 453
 454                 $autoList = array();
 455                 $autoMembersList = array();
 456                 if ( $user instanceof User ) {
 457                         foreach ( Autopromote::getAutopromoteGroups( $user ) as $group ) {
 458                                 $autoList[] = self::buildGroupLink( $group );
 459                                 $autoMembersList[] = self::buildGroupMemberLink( $group );
 460                         }
 461                 }
 462
 463                 $language = $this->getLanguage();
 464                 $displayedList = $this->msg( 'userrights-groupsmember-type',
 465                         $language->listToText( $list ),
 466                         $language->listToText( $membersList )
 467                 )->plain();
 468                 $displayedAutolist = $this->msg( 'userrights-groupsmember-type',
 469                         $language->listToText( $autoList ),
 470                         $language->listToText( $autoMembersList )
 471                 )->plain();
 472
 473                 $grouplist = '';
 474                 $count = count( $list );
 475                 if ( $count > 0 ) {
 476                         $grouplist = $this->msg( 'userrights-groupsmember', $count, $user->getName() )->parse();
 477                         $grouplist = '<p>' . $grouplist . ' ' . $displayedList . "</p>\n";
 478                 }
 479                 $count = count( $autoList );
 480                 if ( $count > 0 ) {
 481                         $autogrouplistintro = $this->msg( 'userrights-groupsmember-auto', $count, $user->getName() )->parse();
 482                         $grouplist .= '<p>' . $autogrouplistintro . ' ' . $displayedAutolist . "</p>\n";
 483                 }
 484
 485                 $userToolLinks = Linker::userToolLinks(
 486                                 $user->getId(),
 487                                 $user->getName(),
 488                                 false, /* default for redContribsWhenNoEdits */
 489                                 Linker::TOOL_LINKS_EMAIL /* Add "send e-mail" link */
 490                 );
 491
 492                 $this->getOutput()->addHTML(
 493                         Xml::openElement( 'form', array( 'method' => 'post', 'action' => $this->getTitle()->getLocalURL(), 'name' => 'editGroup', 'id' => 'mw-userrights-form2' ) ) .
 494                         Html::hidden( 'user', $this->mTarget ) .
 495                         Html::hidden( 'wpEditToken', $this->getUser()->getEditToken( $this->mTarget ) ) .
 496                         Html::hidden( 'conflictcheck-originalgroups', implode( ',', $user->getGroups() ) ) . // Conflict detection
 497                         Xml::openElement( 'fieldset' ) .
 498                         Xml::element( 'legend', array(), $this->msg( 'userrights-editusergroup', $user->getName() )->text() ) .
 499                         $this->msg( 'editinguser' )->params( wfEscapeWikiText( $user->getName() ) )->rawParams( $userToolLinks )->parse() .
 500                         $this->msg( 'userrights-groups-help', $user->getName() )->parse() .
 501                         $grouplist .
 502                         Xml::tags( 'p', null, $this->groupCheckboxes( $groups, $user ) ) .
 503                         Xml::openElement( 'table', array( 'id' => 'mw-userrights-table-outer' ) ) .
 504                                 "<tr>
 505                                         <td class='mw-label'>" .
 506                                                 Xml::label( $this->msg( 'userrights-reason' )->text(), 'wpReason' ) .
 507                                         "</td>
 508                                         <td class='mw-input'>" .
 509                                                 Xml::input( 'user-reason', 60, $this->getRequest()->getVal( 'user-reason', false ),
 510                                                         array( 'id' => 'wpReason', 'maxlength' => 255 ) ) .
 511                                         "</td>
 512                                 </tr>
 513                                 <tr>
 514                                         <td></td>
 515                                         <td class='mw-submit'>" .
 516                                                 Xml::submitButton( $this->msg( 'saveusergroups' )->text(),
 517                                                         array( 'name' => 'saveusergroups' ) + Linker::tooltipAndAccesskeyAttribs( 'userrights-set' ) ) .
 518                                         "</td>
 519                                 </tr>" .
 520                         Xml::closeElement( 'table' ) . "\n" .
 521                         Xml::closeElement( 'fieldset' ) .
 522                         Xml::closeElement( 'form' ) . "\n"
 523                 );
 524         }
 525
 526         /**
 527          * Format a link to a group description page
 528          *
 529          * @param $group string
 530          * @return string
 531          */
 532         private static function buildGroupLink( $group ) {
 533                 return User::makeGroupLinkHtml( $group, User::getGroupName( $group ) );
 534         }
 535
 536         /**
 537          * Format a link to a group member description page
 538          *
 539          * @param $group string
 540          * @return string
 541          */
 542         private static function buildGroupMemberLink( $group ) {
 543                 return User::makeGroupLinkHtml( $group, User::getGroupMember( $group ) );
 544         }
 545
 546         /**
 547          * Returns an array of all groups that may be edited
 548          * @return array Array of groups that may be edited.
 549          */
 550         protected static function getAllGroups() {
 551                 return User::getAllGroups();
 552         }
 553
 554         /**
 555          * Adds a table with checkboxes where you can select what groups to add/remove
 556          *
 557          * @todo Just pass the username string?
 558          * @param array $usergroups groups the user belongs to
 559          * @param $user User a user object
 560          * @return string XHTML table element with checkboxes
 561          */
 562         private function groupCheckboxes( $usergroups, $user ) {
 563                 $allgroups = $this->getAllGroups();
 564                 $ret = '';
 565
 566                 // Put all column info into an associative array so that extensions can
 567                 // more easily manage it.
 568                 $columns = array( 'unchangeable' => array(), 'changeable' => array() );
 569
 570                 foreach ( $allgroups as $group ) {
 571                         $set = in_array( $group, $usergroups );
 572                         // Should the checkbox be disabled?
 573                         $disabled = !(
 574                                 ( $set && $this->canRemove( $group ) ) ||
 575                                 ( !$set && $this->canAdd( $group ) ) );
 576                         // Do we need to point out that this action is irreversible?
 577                         $irreversible = !$disabled && (
 578                                 ( $set && !$this->canAdd( $group ) ) ||
 579                                 ( !$set && !$this->canRemove( $group ) ) );
 580
 581                         $checkbox = array(
 582                                 'set' => $set,
 583                                 'disabled' => $disabled,
 584                                 'irreversible' => $irreversible
 585                         );
 586
 587                         if ( $disabled ) {
 588                                 $columns['unchangeable'][$group] = $checkbox;
 589                         } else {
 590                                 $columns['changeable'][$group] = $checkbox;
 591                         }
 592                 }
 593
 594                 // Build the HTML table
 595                 $ret .= Xml::openElement( 'table', array( 'class' => 'mw-userrights-groups' ) ) .
 596                         "<tr>\n";
 597                 foreach ( $columns as $name => $column ) {
 598                         if ( $column === array() ) {
 599                                 continue;
 600                         }
 601                         // Messages: userrights-changeable-col, userrights-unchangeable-col
 602                         $ret .= Xml::element( 'th', null, $this->msg( 'userrights-' . $name . '-col', count( $column ) )->text() );
 603                 }
 604                 $ret .= "</tr>\n<tr>\n";
 605                 foreach ( $columns as $column ) {
 606                         if ( $column === array() ) {
 607                                 continue;
 608                         }
 609                         $ret .= "\t<td style='vertical-align:top;'>\n";
 610                         foreach ( $column as $group => $checkbox ) {
 611                                 $attr = $checkbox['disabled'] ? array( 'disabled' => 'disabled' ) : array();
 612
 613                                 $member = User::getGroupMember( $group, $user->getName() );
 614                                 if ( $checkbox['irreversible'] ) {
 615                                         $text = $this->msg( 'userrights-irreversible-marker', $member )->escaped();
 616                                 } else {
 617                                         $text = htmlspecialchars( $member );
 618                                 }
 619                                 $checkboxHtml = Xml::checkLabel( $text, "wpGroup-" . $group,
 620                                         "wpGroup-" . $group, $checkbox['set'], $attr );
 621                                 $ret .= "\t\t" . ( $checkbox['disabled']
 622                                         ? Xml::tags( 'span', array( 'class' => 'mw-userrights-disabled' ), $checkboxHtml )
 623                                         : $checkboxHtml
 624                                 ) . "<br />\n";
 625                         }
 626                         $ret .= "\t</td>\n";
 627                 }
 628                 $ret .= Xml::closeElement( 'tr' ) . Xml::closeElement( 'table' );
 629
 630                 return $ret;
 631         }
 632
 633         /**
 634          * @param  $group String: the name of the group to check
 635          * @return bool Can we remove the group?
 636          */
 637         private function canRemove( $group ) {
 638                 // $this->changeableGroups()['remove'] doesn't work, of course. Thanks, PHP.
 639                 $groups = $this->changeableGroups();
 640                 return in_array( $group, $groups['remove'] ) || ( $this->isself && in_array( $group, $groups['remove-self'] ) );
 641         }
 642
 643         /**
 644          * @param string $group the name of the group to check
 645          * @return bool Can we add the group?
 646          */
 647         private function canAdd( $group ) {
 648                 $groups = $this->changeableGroups();
 649                 return in_array( $group, $groups['add'] ) || ( $this->isself && in_array( $group, $groups['add-self'] ) );
 650         }
 651
 652         /**
 653          * Returns $this->getUser()->changeableGroups()
 654          *
 655          * @return Array array( 'add' => array( addablegroups ), 'remove' => array( removablegroups ), 'add-self' => array( addablegroups to self ), 'remove-self' => array( removable groups from self ) )
 656          */
 657         function changeableGroups() {
 658                 return $this->getUser()->changeableGroups();
 659         }
 660
 661         /**
 662          * Show a rights log fragment for the specified user
 663          *
 664          * @param $user User to show log for
 665          * @param $output OutputPage to use
 666          */
 667         protected function showLogFragment( $user, $output ) {
 668                 $rightsLogPage = new LogPage( 'rights' );
 669                 $output->addHTML( Xml::element( 'h2', null, $rightsLogPage->getName()->text() ) );
 670                 LogEventsList::showLogExtract( $output, 'rights', $user->getUserPage() );
 671         }
 672
 673         protected function getGroupName() {
 674                 return 'users';
 675         }
 676 }