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                         // @todo FIXME: There may be intermediate groups we can mention.
 114                         $msg = $user->isAnon() ? 'userrights-nologin' : 'userrights-notallowed';
 115                         throw new PermissionsError( null, array( array( $msg ) ) );
 116                 }
 117
 118                 $this->checkReadOnly();
 119
 120                 $this->setHeaders();
 121                 $this->outputHeader();
 122
 123                 $out = $this->getOutput();
 124                 $out->addModuleStyles( 'mediawiki.special' );
 125
 126                 // show the general form
 127                 if ( count( $available['add'] ) || count( $available['remove'] ) ) {
 128                         $this->switchForm();
 129                 }
 130
 131                 if (
 132                         $request->wasPosted() &&
 133                         $request->getCheck( 'saveusergroups' ) &&
 134                         $user->matchEditToken( $request->getVal( 'wpEditToken' ), $this->mTarget )
 135                 ) {
 136                         // save settings
 137                         $status = $this->fetchUser( $this->mTarget );
 138                         if ( !$status->isOK() ) {
 139                                 $this->getOutput()->addWikiText( $status->getWikiText() );
 140                                 return;
 141                         }
 142
 143                         $targetUser = $status->value;
 144
 145                         if ( $request->getVal( 'conflictcheck-originalgroups' ) !== implode( ',', $targetUser->getGroups() ) ) {
 146                                 $out->addWikiMsg( 'userrights-conflict' );
 147                         } else {
 148                                 $this->saveUserGroups(
 149                                         $this->mTarget,
 150                                         $request->getVal( 'user-reason' ),
 151                                         $targetUser
 152                                 );
 153
 154                                 $out->redirect( $this->getSuccessURL() );
 155                                 return;
 156                         }
 157                 }
 158
 159                 // show some more forms
 160                 if ( $this->mTarget !== null ) {
 161                         $this->editUserGroupsForm( $this->mTarget );
 162                 }
 163         }
 164
 165         function getSuccessURL() {
 166                 return $this->getTitle( $this->mTarget )->getFullURL();
 167         }
 168
 169         /**
 170          * Save user groups changes in the database.
 171          * Data comes from the editUserGroupsForm() form function
 172          *
 173          * @param string $username username to apply changes to.
 174          * @param string $reason reason for group change
 175          * @param User|UserRightsProxy $user Target user object.
 176          * @return null
 177          */
 178         function saveUserGroups( $username, $reason, $user ) {
 179                 $allgroups = $this->getAllGroups();
 180                 $addgroup = array();
 181                 $removegroup = array();
 182
 183                 // This could possibly create a highly unlikely race condition if permissions are changed between
 184                 //  when the form is loaded and when the form is saved. Ignoring it for the moment.
 185                 foreach ( $allgroups as $group ) {
 186                         // We'll tell it to remove all unchecked groups, and add all checked groups.
 187                         // Later on, this gets filtered for what can actually be removed
 188                         if ( $this->getRequest()->getCheck( "wpGroup-$group" ) ) {
 189                                 $addgroup[] = $group;
 190                         } else {
 191                                 $removegroup[] = $group;
 192                         }
 193                 }
 194
 195                 $this->doSaveUserGroups( $user, $addgroup, $removegroup, $reason );
 196         }
 197
 198         /**
 199          * Save user groups changes in the database.
 200          *
 201          * @param $user User object
 202          * @param array $add of groups to add
 203          * @param array $remove of groups to remove
 204          * @param string $reason reason for group change
 205          * @return Array: Tuple of added, then removed groups
 206          */
 207         function doSaveUserGroups( $user, $add, $remove, $reason = '' ) {
 208                 // Validate input set...
 209                 $isself = ( $user->getName() == $this->getUser()->getName() );
 210                 $groups = $user->getGroups();
 211                 $changeable = $this->changeableGroups();
 212                 $addable = array_merge( $changeable['add'], $isself ? $changeable['add-self'] : array() );
 213                 $removable = array_merge( $changeable['remove'], $isself ? $changeable['remove-self'] : array() );
 214
 215                 $remove = array_unique(
 216                         array_intersect( (array)$remove, $removable, $groups ) );
 217                 $add = array_unique( array_diff(
 218                         array_intersect( (array)$add, $addable ),
 219                         $groups )
 220                 );
 221
 222                 $oldGroups = $user->getGroups();
 223                 $newGroups = $oldGroups;
 224
 225                 // remove then add groups
 226                 if ( $remove ) {
 227                         $newGroups = array_diff( $newGroups, $remove );
 228                         foreach ( $remove as $group ) {
 229                                 $user->removeGroup( $group );
 230                         }
 231                 }
 232                 if ( $add ) {
 233                         $newGroups = array_merge( $newGroups, $add );
 234                         foreach ( $add as $group ) {
 235                                 $user->addGroup( $group );
 236                         }
 237                 }
 238                 $newGroups = array_unique( $newGroups );
 239
 240                 // Ensure that caches are cleared
 241                 $user->invalidateCache();
 242
 243                 wfDebug( 'oldGroups: ' . print_r( $oldGroups, true ) );
 244                 wfDebug( 'newGroups: ' . print_r( $newGroups, true ) );
 245                 wfRunHooks( 'UserRights', array( &$user, $add, $remove ) );
 246
 247                 if ( $newGroups != $oldGroups ) {
 248                         $this->addLogEntry( $user, $oldGroups, $newGroups, $reason );
 249                 }
 250                 return array( $add, $remove );
 251         }
 252
 253         /**
 254          * Add a rights log entry for an action.
 255          */
 256         function addLogEntry( $user, $oldGroups, $newGroups, $reason ) {
 257                 $logEntry = new ManualLogEntry( 'rights', 'rights' );
 258                 $logEntry->setPerformer( $this->getUser() );
 259                 $logEntry->setTarget( $user->getUserPage() );
 260                 $logEntry->setComment( $reason );
 261                 $logEntry->setParameters( array(
 262                         '4::oldgroups' => $oldGroups,
 263                         '5::newgroups' => $newGroups,
 264                 ) );
 265                 $logid = $logEntry->insert();
 266                 $logEntry->publish( $logid );
 267         }
 268
 269         /**
 270          * Edit user groups membership
 271          * @param string $username name of the user.
 272          */
 273         function editUserGroupsForm( $username ) {
 274                 $status = $this->fetchUser( $username );
 275                 if ( !$status->isOK() ) {
 276                         $this->getOutput()->addWikiText( $status->getWikiText() );
 277                         return;
 278                 } else {
 279                         $user = $status->value;
 280                 }
 281
 282                 $groups = $user->getGroups();
 283
 284                 $this->showEditUserGroupsForm( $user, $groups );
 285
 286                 // This isn't really ideal logging behavior, but let's not hide the
 287                 // interwiki logs if we're using them as is.
 288                 $this->showLogFragment( $user, $this->getOutput() );
 289         }
 290
 291         /**
 292          * Normalize the input username, which may be local or remote, and
 293          * return a user (or proxy) object for manipulating it.
 294          *
 295          * Side effects: error output for invalid access
 296          * @param string $username
 297          * @return Status object
 298          */
 299         public function fetchUser( $username ) {
 300                 global $wgUserrightsInterwikiDelimiter;
 301
 302                 $parts = explode( $wgUserrightsInterwikiDelimiter, $username );
 303                 if ( count( $parts ) < 2 ) {
 304                         $name = trim( $username );
 305                         $database = '';
 306                 } else {
 307                         list( $name, $database ) = array_map( 'trim', $parts );
 308
 309                         if ( $database == wfWikiID() ) {
 310                                 $database = '';
 311                         } else {
 312                                 if ( !$this->getUser()->isAllowed( 'userrights-interwiki' ) ) {
 313                                         return Status::newFatal( 'userrights-no-interwiki' );
 314                                 }
 315                                 if ( !UserRightsProxy::validDatabase( $database ) ) {
 316                                         return Status::newFatal( 'userrights-nodatabase', $database );
 317                                 }
 318                         }
 319                 }
 320
 321                 if ( $name === '' ) {
 322                         return Status::newFatal( 'nouserspecified' );
 323                 }
 324
 325                 if ( $name[0] == '#' ) {
 326                         // Numeric ID can be specified...
 327                         // We'll do a lookup for the name internally.
 328                         $id = intval( substr( $name, 1 ) );
 329
 330                         if ( $database == '' ) {
 331                                 $name = User::whoIs( $id );
 332                         } else {
 333                                 $name = UserRightsProxy::whoIs( $database, $id );
 334                         }
 335
 336                         if ( !$name ) {
 337                                 return Status::newFatal( 'noname' );
 338                         }
 339                 } else {
 340                         $name = User::getCanonicalName( $name );
 341                         if ( $name === false ) {
 342                                 // invalid name
 343                                 return Status::newFatal( 'nosuchusershort', $username );
 344                         }
 345                 }
 346
 347                 if ( $database == '' ) {
 348                         $user = User::newFromName( $name );
 349                 } else {
 350                         $user = UserRightsProxy::newFromName( $database, $name );
 351                 }
 352
 353                 if ( !$user || $user->isAnon() ) {
 354                         return Status::newFatal( 'nosuchusershort', $username );
 355                 }
 356
 357                 return Status::newGood( $user );
 358         }
 359
 360         function makeGroupNameList( $ids ) {
 361                 if ( empty( $ids ) ) {
 362                         return $this->msg( 'rightsnone' )->inContentLanguage()->text();
 363                 } else {
 364                         return implode( ', ', $ids );
 365                 }
 366         }
 367
 368         /**
 369          * Make a list of group names to be stored as parameter for log entries
 370          *
 371          * @deprecated in 1.21; use LogFormatter instead.
 372          * @param $ids array
 373          * @return string
 374          */
 375         function makeGroupNameListForLog( $ids ) {
 376                 wfDeprecated( __METHOD__, '1.21' );
 377
 378                 if ( empty( $ids ) ) {
 379                         return '';
 380                 } else {
 381                         return $this->makeGroupNameList( $ids );
 382                 }
 383         }
 384
 385         /**
 386          * Output a form to allow searching for a user
 387          */
 388         function switchForm() {
 389                 global $wgScript;
 390                 $this->getOutput()->addHTML(
 391                         Html::openElement( 'form', array( 'method' => 'get', 'action' => $wgScript, 'name' => 'uluser', 'id' => 'mw-userrights-form1' ) ) .
 392                         Html::hidden( 'title', $this->getTitle()->getPrefixedText() ) .
 393                         Xml::fieldset( $this->msg( 'userrights-lookup-user' )->text() ) .
 394                         Xml::inputLabel( $this->msg( 'userrights-user-editname' )->text(), 'user', 'username', 30, str_replace( '_', ' ', $this->mTarget ) ) . ' ' .
 395                         Xml::submitButton( $this->msg( 'editusergroup' )->text() ) .
 396                         Html::closeElement( 'fieldset' ) .
 397                         Html::closeElement( 'form' ) . "\n"
 398                 );
 399         }
 400
 401         /**
 402          * Go through used and available groups and return the ones that this
 403          * form will be able to manipulate based on the current user's system
 404          * permissions.
 405          *
 406          * @param array $groups list of groups the given user is in
 407          * @return Array:  Tuple of addable, then removable groups
 408          */
 409         protected function splitGroups( $groups ) {
 410                 list( $addable, $removable, $addself, $removeself ) = array_values( $this->changeableGroups() );
 411
 412                 $removable = array_intersect(
 413                         array_merge( $this->isself ? $removeself : array(), $removable ),
 414                         $groups
 415                 ); // Can't remove groups the user doesn't have
 416                 $addable = array_diff(
 417                         array_merge( $this->isself ? $addself : array(), $addable ),
 418                         $groups
 419                 ); // Can't add groups the user does have
 420
 421                 return array( $addable, $removable );
 422         }
 423
 424         /**
 425          * Show the form to edit group memberships.
 426          *
 427          * @param $user      User or UserRightsProxy you're editing
 428          * @param $groups    Array:  Array of groups the user is in
 429          */
 430         protected function showEditUserGroupsForm( $user, $groups ) {
 431                 $list = array();
 432                 $membersList = array();
 433                 foreach ( $groups as $group ) {
 434                         $list[] = self::buildGroupLink( $group );
 435                         $membersList[] = self::buildGroupMemberLink( $group );
 436                 }
 437
 438                 $autoList = array();
 439                 $autoMembersList = array();
 440                 if ( $user instanceof User ) {
 441                         foreach ( Autopromote::getAutopromoteGroups( $user ) as $group ) {
 442                                 $autoList[] = self::buildGroupLink( $group );
 443                                 $autoMembersList[] = self::buildGroupMemberLink( $group );
 444                         }
 445                 }
 446
 447                 $language = $this->getLanguage();
 448                 $displayedList = $this->msg( 'userrights-groupsmember-type',
 449                         $language->listToText( $list ),
 450                         $language->listToText( $membersList )
 451                 )->plain();
 452                 $displayedAutolist = $this->msg( 'userrights-groupsmember-type',
 453                         $language->listToText( $autoList ),
 454                         $language->listToText( $autoMembersList )
 455                 )->plain();
 456
 457                 $grouplist = '';
 458                 $count = count( $list );
 459                 if ( $count > 0 ) {
 460                         $grouplist = $this->msg( 'userrights-groupsmember', $count, $user->getName() )->parse();
 461                         $grouplist = '<p>' . $grouplist . ' ' . $displayedList . "</p>\n";
 462                 }
 463                 $count = count( $autoList );
 464                 if ( $count > 0 ) {
 465                         $autogrouplistintro = $this->msg( 'userrights-groupsmember-auto', $count, $user->getName() )->parse();
 466                         $grouplist .= '<p>' . $autogrouplistintro . ' ' . $displayedAutolist . "</p>\n";
 467                 }
 468
 469                 $userToolLinks = Linker::userToolLinks(
 470                                 $user->getId(),
 471                                 $user->getName(),
 472                                 false, /* default for redContribsWhenNoEdits */
 473                                 Linker::TOOL_LINKS_EMAIL /* Add "send e-mail" link */
 474                 );
 475
 476                 $this->getOutput()->addHTML(
 477                         Xml::openElement( 'form', array( 'method' => 'post', 'action' => $this->getTitle()->getLocalURL(), 'name' => 'editGroup', 'id' => 'mw-userrights-form2' ) ) .
 478                         Html::hidden( 'user', $this->mTarget ) .
 479                         Html::hidden( 'wpEditToken', $this->getUser()->getEditToken( $this->mTarget ) ) .
 480                         Html::hidden( 'conflictcheck-originalgroups', implode( ',', $user->getGroups() ) ) . // Conflict detection
 481                         Xml::openElement( 'fieldset' ) .
 482                         Xml::element( 'legend', array(), $this->msg( 'userrights-editusergroup', $user->getName() )->text() ) .
 483                         $this->msg( 'editinguser' )->params( wfEscapeWikiText( $user->getName() ) )->rawParams( $userToolLinks )->parse() .
 484                         $this->msg( 'userrights-groups-help', $user->getName() )->parse() .
 485                         $grouplist .
 486                         Xml::tags( 'p', null, $this->groupCheckboxes( $groups, $user ) ) .
 487                         Xml::openElement( 'table', array( 'id' => 'mw-userrights-table-outer' ) ) .
 488                                 "<tr>
 489                                         <td class='mw-label'>" .
 490                                                 Xml::label( $this->msg( 'userrights-reason' )->text(), 'wpReason' ) .
 491                                         "</td>
 492                                         <td class='mw-input'>" .
 493                                                 Xml::input( 'user-reason', 60, $this->getRequest()->getVal( 'user-reason', false ),
 494                                                         array( 'id' => 'wpReason', 'maxlength' => 255 ) ) .
 495                                         "</td>
 496                                 </tr>
 497                                 <tr>
 498                                         <td></td>
 499                                         <td class='mw-submit'>" .
 500                                                 Xml::submitButton( $this->msg( 'saveusergroups' )->text(),
 501                                                         array( 'name' => 'saveusergroups' ) + Linker::tooltipAndAccesskeyAttribs( 'userrights-set' ) ) .
 502                                         "</td>
 503                                 </tr>" .
 504                         Xml::closeElement( 'table' ) . "\n" .
 505                         Xml::closeElement( 'fieldset' ) .
 506                         Xml::closeElement( 'form' ) . "\n"
 507                 );
 508         }
 509
 510         /**
 511          * Format a link to a group description page
 512          *
 513          * @param $group string
 514          * @return string
 515          */
 516         private static function buildGroupLink( $group ) {
 517                 return User::makeGroupLinkHtml( $group, User::getGroupName( $group ) );
 518         }
 519
 520         /**
 521          * Format a link to a group member description page
 522          *
 523          * @param $group string
 524          * @return string
 525          */
 526         private static function buildGroupMemberLink( $group ) {
 527                 return User::makeGroupLinkHtml( $group, User::getGroupMember( $group ) );
 528         }
 529
 530         /**
 531          * Returns an array of all groups that may be edited
 532          * @return array Array of groups that may be edited.
 533          */
 534         protected static function getAllGroups() {
 535                 return User::getAllGroups();
 536         }
 537
 538         /**
 539          * Adds a table with checkboxes where you can select what groups to add/remove
 540          *
 541          * @todo Just pass the username string?
 542          * @param array $usergroups groups the user belongs to
 543          * @param $user User a user object
 544          * @return string XHTML table element with checkboxes
 545          */
 546         private function groupCheckboxes( $usergroups, $user ) {
 547                 $allgroups = $this->getAllGroups();
 548                 $ret = '';
 549
 550                 # Put all column info into an associative array so that extensions can
 551                 # more easily manage it.
 552                 $columns = array( 'unchangeable' => array(), 'changeable' => array() );
 553
 554                 foreach ( $allgroups as $group ) {
 555                         $set = in_array( $group, $usergroups );
 556                         # Should the checkbox be disabled?
 557                         $disabled = !(
 558                                 ( $set && $this->canRemove( $group ) ) ||
 559                                 ( !$set && $this->canAdd( $group ) ) );
 560                         # Do we need to point out that this action is irreversible?
 561                         $irreversible = !$disabled && (
 562                                 ( $set && !$this->canAdd( $group ) ) ||
 563                                 ( !$set && !$this->canRemove( $group ) ) );
 564
 565                         $checkbox = array(
 566                                 'set' => $set,
 567                                 'disabled' => $disabled,
 568                                 'irreversible' => $irreversible
 569                         );
 570
 571                         if ( $disabled ) {
 572                                 $columns['unchangeable'][$group] = $checkbox;
 573                         } else {
 574                                 $columns['changeable'][$group] = $checkbox;
 575                         }
 576                 }
 577
 578                 # Build the HTML table
 579                 $ret .= Xml::openElement( 'table', array( 'class' => 'mw-userrights-groups' ) ) .
 580                         "<tr>\n";
 581                 foreach ( $columns as $name => $column ) {
 582                         if ( $column === array() ) {
 583                                 continue;
 584                         }
 585                         $ret .= Xml::element( 'th', null, $this->msg( 'userrights-' . $name . '-col', count( $column ) )->text() );
 586                 }
 587                 $ret .= "</tr>\n<tr>\n";
 588                 foreach ( $columns as $column ) {
 589                         if ( $column === array() ) {
 590                                 continue;
 591                         }
 592                         $ret .= "\t<td style='vertical-align:top;'>\n";
 593                         foreach ( $column as $group => $checkbox ) {
 594                                 $attr = $checkbox['disabled'] ? array( 'disabled' => 'disabled' ) : array();
 595
 596                                 $member = User::getGroupMember( $group, $user->getName() );
 597                                 if ( $checkbox['irreversible'] ) {
 598                                         $text = $this->msg( 'userrights-irreversible-marker', $member )->escaped();
 599                                 } else {
 600                                         $text = htmlspecialchars( $member );
 601                                 }
 602                                 $checkboxHtml = Xml::checkLabel( $text, "wpGroup-" . $group,
 603                                         "wpGroup-" . $group, $checkbox['set'], $attr );
 604                                 $ret .= "\t\t" . ( $checkbox['disabled']
 605                                         ? Xml::tags( 'span', array( 'class' => 'mw-userrights-disabled' ), $checkboxHtml )
 606                                         : $checkboxHtml
 607                                 ) . "<br />\n";
 608                         }
 609                         $ret .= "\t</td>\n";
 610                 }
 611                 $ret .= Xml::closeElement( 'tr' ) . Xml::closeElement( 'table' );
 612
 613                 return $ret;
 614         }
 615
 616         /**
 617          * @param  $group String: the name of the group to check
 618          * @return bool Can we remove the group?
 619          */
 620         private function canRemove( $group ) {
 621                 // $this->changeableGroups()['remove'] doesn't work, of course. Thanks,
 622                 // PHP.
 623                 $groups = $this->changeableGroups();
 624                 return in_array( $group, $groups['remove'] ) || ( $this->isself && in_array( $group, $groups['remove-self'] ) );
 625         }
 626
 627         /**
 628          * @param string $group the name of the group to check
 629          * @return bool Can we add the group?
 630          */
 631         private function canAdd( $group ) {
 632                 $groups = $this->changeableGroups();
 633                 return in_array( $group, $groups['add'] ) || ( $this->isself && in_array( $group, $groups['add-self'] ) );
 634         }
 635
 636         /**
 637          * Returns $this->getUser()->changeableGroups()
 638          *
 639          * @return Array array( 'add' => array( addablegroups ), 'remove' => array( removablegroups ), 'add-self' => array( addablegroups to self ), 'remove-self' => array( removable groups from self ) )
 640          */
 641         function changeableGroups() {
 642                 return $this->getUser()->changeableGroups();
 643         }
 644
 645         /**
 646          * Show a rights log fragment for the specified user
 647          *
 648          * @param $user User to show log for
 649          * @param $output OutputPage to use
 650          */
 651         protected function showLogFragment( $user, $output ) {
 652                 $rightsLogPage = new LogPage( 'rights' );
 653                 $output->addHTML( Xml::element( 'h2', null, $rightsLogPage->getName()->text() ) );
 654                 LogEventsList::showLogExtract( $output, 'rights', $user->getUserPage() );
 655         }
 656
 657         protected function getGroupName() {
 658                 return 'users';
 659         }
 660 }