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                 // Validate input set...
 220                 $isself = ( $user->getName() == $this->getUser()->getName() );
 221                 $groups = $user->getGroups();
 222                 $changeable = $this->changeableGroups();
 223                 $addable = array_merge( $changeable['add'], $isself ? $changeable['add-self'] : array() );
 224                 $removable = array_merge( $changeable['remove'], $isself ? $changeable['remove-self'] : array() );
 225
 226                 $remove = array_unique(
 227                         array_intersect( (array)$remove, $removable, $groups ) );
 228                 $add = array_unique( array_diff(
 229                         array_intersect( (array)$add, $addable ),
 230                         $groups )
 231                 );
 232
 233                 $oldGroups = $user->getGroups();
 234                 $newGroups = $oldGroups;
 235
 236                 // remove then add groups
 237                 if ( $remove ) {
 238                         $newGroups = array_diff( $newGroups, $remove );
 239                         foreach ( $remove as $group ) {
 240                                 $user->removeGroup( $group );
 241                         }
 242                 }
 243                 if ( $add ) {
 244                         $newGroups = array_merge( $newGroups, $add );
 245                         foreach ( $add as $group ) {
 246                                 $user->addGroup( $group );
 247                         }
 248                 }
 249                 $newGroups = array_unique( $newGroups );
 250
 251                 // Ensure that caches are cleared
 252                 $user->invalidateCache();
 253
 254                 wfDebug( 'oldGroups: ' . print_r( $oldGroups, true ) );
 255                 wfDebug( 'newGroups: ' . print_r( $newGroups, true ) );
 256                 wfRunHooks( 'UserRights', array( &$user, $add, $remove ) );
 257
 258                 if ( $newGroups != $oldGroups ) {
 259                         $this->addLogEntry( $user, $oldGroups, $newGroups, $reason );
 260                 }
 261                 return array( $add, $remove );
 262         }
 263
 264         /**
 265          * Add a rights log entry for an action.
 266          */
 267         function addLogEntry( $user, $oldGroups, $newGroups, $reason ) {
 268                 $logEntry = new ManualLogEntry( 'rights', 'rights' );
 269                 $logEntry->setPerformer( $this->getUser() );
 270                 $logEntry->setTarget( $user->getUserPage() );
 271                 $logEntry->setComment( $reason );
 272                 $logEntry->setParameters( array(
 273                         '4::oldgroups' => $oldGroups,
 274                         '5::newgroups' => $newGroups,
 275                 ) );
 276                 $logid = $logEntry->insert();
 277                 $logEntry->publish( $logid );
 278         }
 279
 280         /**
 281          * Edit user groups membership
 282          * @param string $username name of the user.
 283          */
 284         function editUserGroupsForm( $username ) {
 285                 $status = $this->fetchUser( $username );
 286                 if ( !$status->isOK() ) {
 287                         $this->getOutput()->addWikiText( $status->getWikiText() );
 288                         return;
 289                 } else {
 290                         $user = $status->value;
 291                 }
 292
 293                 $groups = $user->getGroups();
 294
 295                 $this->showEditUserGroupsForm( $user, $groups );
 296
 297                 // This isn't really ideal logging behavior, but let's not hide the
 298                 // interwiki logs if we're using them as is.
 299                 $this->showLogFragment( $user, $this->getOutput() );
 300         }
 301
 302         /**
 303          * Normalize the input username, which may be local or remote, and
 304          * return a user (or proxy) object for manipulating it.
 305          *
 306          * Side effects: error output for invalid access
 307          * @param string $username
 308          * @return Status object
 309          */
 310         public function fetchUser( $username ) {
 311                 global $wgUserrightsInterwikiDelimiter;
 312
 313                 $parts = explode( $wgUserrightsInterwikiDelimiter, $username );
 314                 if ( count( $parts ) < 2 ) {
 315                         $name = trim( $username );
 316                         $database = '';
 317                 } else {
 318                         list( $name, $database ) = array_map( 'trim', $parts );
 319
 320                         if ( $database == wfWikiID() ) {
 321                                 $database = '';
 322                         } else {
 323                                 if ( !$this->getUser()->isAllowed( 'userrights-interwiki' ) ) {
 324                                         return Status::newFatal( 'userrights-no-interwiki' );
 325                                 }
 326                                 if ( !UserRightsProxy::validDatabase( $database ) ) {
 327                                         return Status::newFatal( 'userrights-nodatabase', $database );
 328                                 }
 329                         }
 330                 }
 331
 332                 if ( $name === '' ) {
 333                         return Status::newFatal( 'nouserspecified' );
 334                 }
 335
 336                 if ( $name[0] == '#' ) {
 337                         // Numeric ID can be specified...
 338                         // We'll do a lookup for the name internally.
 339                         $id = intval( substr( $name, 1 ) );
 340
 341                         if ( $database == '' ) {
 342                                 $name = User::whoIs( $id );
 343                         } else {
 344                                 $name = UserRightsProxy::whoIs( $database, $id );
 345                         }
 346
 347                         if ( !$name ) {
 348                                 return Status::newFatal( 'noname' );
 349                         }
 350                 } else {
 351                         $name = User::getCanonicalName( $name );
 352                         if ( $name === false ) {
 353                                 // invalid name
 354                                 return Status::newFatal( 'nosuchusershort', $username );
 355                         }
 356                 }
 357
 358                 if ( $database == '' ) {
 359                         $user = User::newFromName( $name );
 360                 } else {
 361                         $user = UserRightsProxy::newFromName( $database, $name );
 362                 }
 363
 364                 if ( !$user || $user->isAnon() ) {
 365                         return Status::newFatal( 'nosuchusershort', $username );
 366                 }
 367
 368                 return Status::newGood( $user );
 369         }
 370
 371         function makeGroupNameList( $ids ) {
 372                 if ( empty( $ids ) ) {
 373                         return $this->msg( 'rightsnone' )->inContentLanguage()->text();
 374                 } else {
 375                         return implode( ', ', $ids );
 376                 }
 377         }
 378
 379         /**
 380          * Make a list of group names to be stored as parameter for log entries
 381          *
 382          * @deprecated in 1.21; use LogFormatter instead.
 383          * @param $ids array
 384          * @return string
 385          */
 386         function makeGroupNameListForLog( $ids ) {
 387                 wfDeprecated( __METHOD__, '1.21' );
 388
 389                 if ( empty( $ids ) ) {
 390                         return '';
 391                 } else {
 392                         return $this->makeGroupNameList( $ids );
 393                 }
 394         }
 395
 396         /**
 397          * Output a form to allow searching for a user
 398          */
 399         function switchForm() {
 400                 global $wgScript;
 401                 $this->getOutput()->addHTML(
 402                         Html::openElement( 'form', array( 'method' => 'get', 'action' => $wgScript, 'name' => 'uluser', 'id' => 'mw-userrights-form1' ) ) .
 403                         Html::hidden( 'title', $this->getTitle()->getPrefixedText() ) .
 404                         Xml::fieldset( $this->msg( 'userrights-lookup-user' )->text() ) .
 405                         Xml::inputLabel( $this->msg( 'userrights-user-editname' )->text(), 'user', 'username', 30, str_replace( '_', ' ', $this->mTarget ), array( 'autofocus' => true ) ) . ' ' .
 406                         Xml::submitButton( $this->msg( 'editusergroup' )->text() ) .
 407                         Html::closeElement( 'fieldset' ) .
 408                         Html::closeElement( 'form' ) . "\n"
 409                 );
 410         }
 411
 412         /**
 413          * Go through used and available groups and return the ones that this
 414          * form will be able to manipulate based on the current user's system
 415          * permissions.
 416          *
 417          * @param array $groups list of groups the given user is in
 418          * @return Array:  Tuple of addable, then removable groups
 419          */
 420         protected function splitGroups( $groups ) {
 421                 list( $addable, $removable, $addself, $removeself ) = array_values( $this->changeableGroups() );
 422
 423                 $removable = array_intersect(
 424                         array_merge( $this->isself ? $removeself : array(), $removable ),
 425                         $groups
 426                 ); // Can't remove groups the user doesn't have
 427                 $addable = array_diff(
 428                         array_merge( $this->isself ? $addself : array(), $addable ),
 429                         $groups
 430                 ); // Can't add groups the user does have
 431
 432                 return array( $addable, $removable );
 433         }
 434
 435         /**
 436          * Show the form to edit group memberships.
 437          *
 438          * @param $user      User or UserRightsProxy you're editing
 439          * @param $groups    Array:  Array of groups the user is in
 440          */
 441         protected function showEditUserGroupsForm( $user, $groups ) {
 442                 $list = array();
 443                 $membersList = array();
 444                 foreach ( $groups as $group ) {
 445                         $list[] = self::buildGroupLink( $group );
 446                         $membersList[] = self::buildGroupMemberLink( $group );
 447                 }
 448
 449                 $autoList = array();
 450                 $autoMembersList = array();
 451                 if ( $user instanceof User ) {
 452                         foreach ( Autopromote::getAutopromoteGroups( $user ) as $group ) {
 453                                 $autoList[] = self::buildGroupLink( $group );
 454                                 $autoMembersList[] = self::buildGroupMemberLink( $group );
 455                         }
 456                 }
 457
 458                 $language = $this->getLanguage();
 459                 $displayedList = $this->msg( 'userrights-groupsmember-type',
 460                         $language->listToText( $list ),
 461                         $language->listToText( $membersList )
 462                 )->plain();
 463                 $displayedAutolist = $this->msg( 'userrights-groupsmember-type',
 464                         $language->listToText( $autoList ),
 465                         $language->listToText( $autoMembersList )
 466                 )->plain();
 467
 468                 $grouplist = '';
 469                 $count = count( $list );
 470                 if ( $count > 0 ) {
 471                         $grouplist = $this->msg( 'userrights-groupsmember', $count, $user->getName() )->parse();
 472                         $grouplist = '<p>' . $grouplist . ' ' . $displayedList . "</p>\n";
 473                 }
 474                 $count = count( $autoList );
 475                 if ( $count > 0 ) {
 476                         $autogrouplistintro = $this->msg( 'userrights-groupsmember-auto', $count, $user->getName() )->parse();
 477                         $grouplist .= '<p>' . $autogrouplistintro . ' ' . $displayedAutolist . "</p>\n";
 478                 }
 479
 480                 $userToolLinks = Linker::userToolLinks(
 481                                 $user->getId(),
 482                                 $user->getName(),
 483                                 false, /* default for redContribsWhenNoEdits */
 484                                 Linker::TOOL_LINKS_EMAIL /* Add "send e-mail" link */
 485                 );
 486
 487                 $this->getOutput()->addHTML(
 488                         Xml::openElement( 'form', array( 'method' => 'post', 'action' => $this->getTitle()->getLocalURL(), 'name' => 'editGroup', 'id' => 'mw-userrights-form2' ) ) .
 489                         Html::hidden( 'user', $this->mTarget ) .
 490                         Html::hidden( 'wpEditToken', $this->getUser()->getEditToken( $this->mTarget ) ) .
 491                         Html::hidden( 'conflictcheck-originalgroups', implode( ',', $user->getGroups() ) ) . // Conflict detection
 492                         Xml::openElement( 'fieldset' ) .
 493                         Xml::element( 'legend', array(), $this->msg( 'userrights-editusergroup', $user->getName() )->text() ) .
 494                         $this->msg( 'editinguser' )->params( wfEscapeWikiText( $user->getName() ) )->rawParams( $userToolLinks )->parse() .
 495                         $this->msg( 'userrights-groups-help', $user->getName() )->parse() .
 496                         $grouplist .
 497                         Xml::tags( 'p', null, $this->groupCheckboxes( $groups, $user ) ) .
 498                         Xml::openElement( 'table', array( 'id' => 'mw-userrights-table-outer' ) ) .
 499                                 "<tr>
 500                                         <td class='mw-label'>" .
 501                                                 Xml::label( $this->msg( 'userrights-reason' )->text(), 'wpReason' ) .
 502                                         "</td>
 503                                         <td class='mw-input'>" .
 504                                                 Xml::input( 'user-reason', 60, $this->getRequest()->getVal( 'user-reason', false ),
 505                                                         array( 'id' => 'wpReason', 'maxlength' => 255 ) ) .
 506                                         "</td>
 507                                 </tr>
 508                                 <tr>
 509                                         <td></td>
 510                                         <td class='mw-submit'>" .
 511                                                 Xml::submitButton( $this->msg( 'saveusergroups' )->text(),
 512                                                         array( 'name' => 'saveusergroups' ) + Linker::tooltipAndAccesskeyAttribs( 'userrights-set' ) ) .
 513                                         "</td>
 514                                 </tr>" .
 515                         Xml::closeElement( 'table' ) . "\n" .
 516                         Xml::closeElement( 'fieldset' ) .
 517                         Xml::closeElement( 'form' ) . "\n"
 518                 );
 519         }
 520
 521         /**
 522          * Format a link to a group description page
 523          *
 524          * @param $group string
 525          * @return string
 526          */
 527         private static function buildGroupLink( $group ) {
 528                 return User::makeGroupLinkHtml( $group, User::getGroupName( $group ) );
 529         }
 530
 531         /**
 532          * Format a link to a group member description page
 533          *
 534          * @param $group string
 535          * @return string
 536          */
 537         private static function buildGroupMemberLink( $group ) {
 538                 return User::makeGroupLinkHtml( $group, User::getGroupMember( $group ) );
 539         }
 540
 541         /**
 542          * Returns an array of all groups that may be edited
 543          * @return array Array of groups that may be edited.
 544          */
 545         protected static function getAllGroups() {
 546                 return User::getAllGroups();
 547         }
 548
 549         /**
 550          * Adds a table with checkboxes where you can select what groups to add/remove
 551          *
 552          * @todo Just pass the username string?
 553          * @param array $usergroups groups the user belongs to
 554          * @param $user User a user object
 555          * @return string XHTML table element with checkboxes
 556          */
 557         private function groupCheckboxes( $usergroups, $user ) {
 558                 $allgroups = $this->getAllGroups();
 559                 $ret = '';
 560
 561                 # Put all column info into an associative array so that extensions can
 562                 # more easily manage it.
 563                 $columns = array( 'unchangeable' => array(), 'changeable' => array() );
 564
 565                 foreach ( $allgroups as $group ) {
 566                         $set = in_array( $group, $usergroups );
 567                         # Should the checkbox be disabled?
 568                         $disabled = !(
 569                                 ( $set && $this->canRemove( $group ) ) ||
 570                                 ( !$set && $this->canAdd( $group ) ) );
 571                         # Do we need to point out that this action is irreversible?
 572                         $irreversible = !$disabled && (
 573                                 ( $set && !$this->canAdd( $group ) ) ||
 574                                 ( !$set && !$this->canRemove( $group ) ) );
 575
 576                         $checkbox = array(
 577                                 'set' => $set,
 578                                 'disabled' => $disabled,
 579                                 'irreversible' => $irreversible
 580                         );
 581
 582                         if ( $disabled ) {
 583                                 $columns['unchangeable'][$group] = $checkbox;
 584                         } else {
 585                                 $columns['changeable'][$group] = $checkbox;
 586                         }
 587                 }
 588
 589                 # Build the HTML table
 590                 $ret .= Xml::openElement( 'table', array( 'class' => 'mw-userrights-groups' ) ) .
 591                         "<tr>\n";
 592                 foreach ( $columns as $name => $column ) {
 593                         if ( $column === array() ) {
 594                                 continue;
 595                         }
 596                         $ret .= Xml::element( 'th', null, $this->msg( 'userrights-' . $name . '-col', count( $column ) )->text() );
 597                 }
 598                 $ret .= "</tr>\n<tr>\n";
 599                 foreach ( $columns as $column ) {
 600                         if ( $column === array() ) {
 601                                 continue;
 602                         }
 603                         $ret .= "\t<td style='vertical-align:top;'>\n";
 604                         foreach ( $column as $group => $checkbox ) {
 605                                 $attr = $checkbox['disabled'] ? array( 'disabled' => 'disabled' ) : array();
 606
 607                                 $member = User::getGroupMember( $group, $user->getName() );
 608                                 if ( $checkbox['irreversible'] ) {
 609                                         $text = $this->msg( 'userrights-irreversible-marker', $member )->escaped();
 610                                 } else {
 611                                         $text = htmlspecialchars( $member );
 612                                 }
 613                                 $checkboxHtml = Xml::checkLabel( $text, "wpGroup-" . $group,
 614                                         "wpGroup-" . $group, $checkbox['set'], $attr );
 615                                 $ret .= "\t\t" . ( $checkbox['disabled']
 616                                         ? Xml::tags( 'span', array( 'class' => 'mw-userrights-disabled' ), $checkboxHtml )
 617                                         : $checkboxHtml
 618                                 ) . "<br />\n";
 619                         }
 620                         $ret .= "\t</td>\n";
 621                 }
 622                 $ret .= Xml::closeElement( 'tr' ) . Xml::closeElement( 'table' );
 623
 624                 return $ret;
 625         }
 626
 627         /**
 628          * @param  $group String: the name of the group to check
 629          * @return bool Can we remove the group?
 630          */
 631         private function canRemove( $group ) {
 632                 // $this->changeableGroups()['remove'] doesn't work, of course. Thanks,
 633                 // PHP.
 634                 $groups = $this->changeableGroups();
 635                 return in_array( $group, $groups['remove'] ) || ( $this->isself && in_array( $group, $groups['remove-self'] ) );
 636         }
 637
 638         /**
 639          * @param string $group the name of the group to check
 640          * @return bool Can we add the group?
 641          */
 642         private function canAdd( $group ) {
 643                 $groups = $this->changeableGroups();
 644                 return in_array( $group, $groups['add'] ) || ( $this->isself && in_array( $group, $groups['add-self'] ) );
 645         }
 646
 647         /**
 648          * Returns $this->getUser()->changeableGroups()
 649          *
 650          * @return Array array( 'add' => array( addablegroups ), 'remove' => array( removablegroups ), 'add-self' => array( addablegroups to self ), 'remove-self' => array( removable groups from self ) )
 651          */
 652         function changeableGroups() {
 653                 return $this->getUser()->changeableGroups();
 654         }
 655
 656         /**
 657          * Show a rights log fragment for the specified user
 658          *
 659          * @param $user User to show log for
 660          * @param $output OutputPage to use
 661          */
 662         protected function showLogFragment( $user, $output ) {
 663                 $rightsLogPage = new LogPage( 'rights' );
 664                 $output->addHTML( Xml::element( 'h2', null, $rightsLogPage->getName()->text() ) );
 665                 LogEventsList::showLogExtract( $output, 'rights', $user->getUserPage() );
 666         }
 667
 668         protected function getGroupName() {
 669                 return 'users';
 670         }
 671 }