includes/specials/SpecialBlock.php

   1 <?php
   2 /**
   3  * Implements Special:Block
   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 use MediaWiki\Block\BlockRestriction;
  25 use MediaWiki\Block\Restriction\PageRestriction;
  26 use MediaWiki\Block\Restriction\NamespaceRestriction;
  27
  28 /**
  29  * A special page that allows users with 'block' right to block users from
  30  * editing pages and other actions
  31  *
  32  * @ingroup SpecialPage
  33  */
  34 class SpecialBlock extends FormSpecialPage {
  35         /** @var User|string|null User to be blocked, as passed either by parameter (url?wpTarget=Foo)
  36          * or as subpage (Special:Block/Foo) */
  37         protected $target;
  38
  39         /** @var int Block::TYPE_ constant */
  40         protected $type;
  41
  42         /** @var User|string The previous block target */
  43         protected $previousTarget;
  44
  45         /** @var bool Whether the previous submission of the form asked for HideUser */
  46         protected $requestedHideUser;
  47
  48         /** @var bool */
  49         protected $alreadyBlocked;
  50
  51         /** @var array */
  52         protected $preErrors = [];
  53
  54         public function __construct() {
  55                 parent::__construct( 'Block', 'block' );
  56         }
  57
  58         public function doesWrites() {
  59                 return true;
  60         }
  61
  62         /**
  63          * Checks that the user can unblock themselves if they are trying to do so
  64          *
  65          * @param User $user
  66          * @throws ErrorPageError
  67          */
  68         protected function checkExecutePermissions( User $user ) {
  69                 parent::checkExecutePermissions( $user );
  70                 # T17810: blocked admins should have limited access here
  71                 $status = self::checkUnblockSelf( $this->target, $user );
  72                 if ( $status !== true ) {
  73                         throw new ErrorPageError( 'badaccess', $status );
  74                 }
  75         }
  76
  77         /**
  78          * We allow certain special cases where user is blocked
  79          *
  80          * @return bool
  81          */
  82         public function requiresUnblock() {
  83                 return false;
  84         }
  85
  86         /**
  87          * Handle some magic here
  88          *
  89          * @param string $par
  90          */
  91         protected function setParameter( $par ) {
  92                 # Extract variables from the request.  Try not to get into a situation where we
  93                 # need to extract *every* variable from the form just for processing here, but
  94                 # there are legitimate uses for some variables
  95                 $request = $this->getRequest();
  96                 list( $this->target, $this->type ) = self::getTargetAndType( $par, $request );
  97                 if ( $this->target instanceof User ) {
  98                         # Set the 'relevant user' in the skin, so it displays links like Contributions,
  99                         # User logs, UserRights, etc.
 100                         $this->getSkin()->setRelevantUser( $this->target );
 101                 }
 102
 103                 list( $this->previousTarget, /*...*/ ) =
 104                         Block::parseTarget( $request->getVal( 'wpPreviousTarget' ) );
 105                 $this->requestedHideUser = $request->getBool( 'wpHideUser' );
 106         }
 107
 108         /**
 109          * Customizes the HTMLForm a bit
 110          *
 111          * @param HTMLForm $form
 112          */
 113         protected function alterForm( HTMLForm $form ) {
 114                 $form->setHeaderText( '' );
 115                 $form->setSubmitDestructive();
 116
 117                 $msg = $this->alreadyBlocked ? 'ipb-change-block' : 'ipbsubmit';
 118                 $form->setSubmitTextMsg( $msg );
 119
 120                 $this->addHelpLink( 'Help:Blocking users' );
 121
 122                 # Don't need to do anything if the form has been posted
 123                 if ( !$this->getRequest()->wasPosted() && $this->preErrors ) {
 124                         $s = $form->formatErrors( $this->preErrors );
 125                         if ( $s ) {
 126                                 $form->addHeaderText( Html::rawElement(
 127                                         'div',
 128                                         [ 'class' => 'error' ],
 129                                         $s
 130                                 ) );
 131                         }
 132                 }
 133         }
 134
 135         protected function getDisplayFormat() {
 136                 return 'ooui';
 137         }
 138
 139         /**
 140          * Get the HTMLForm descriptor array for the block form
 141          * @return array
 142          */
 143         protected function getFormFields() {
 144                 $conf = $this->getConfig();
 145                 $enablePartialBlocks = $conf->get( 'EnablePartialBlocks' );
 146                 $blockAllowsUTEdit = $conf->get( 'BlockAllowsUTEdit' );
 147
 148                 $this->getOutput()->enableOOUI();
 149
 150                 $user = $this->getUser();
 151
 152                 $suggestedDurations = self::getSuggestedDurations();
 153
 154                 $a = [];
 155
 156                 $a['Target'] = [
 157                         'type' => 'user',
 158                         'ipallowed' => true,
 159                         'iprange' => true,
 160                         'id' => 'mw-bi-target',
 161                         'size' => '45',
 162                         'autofocus' => true,
 163                         'required' => true,
 164                         'validation-callback' => [ __CLASS__, 'validateTargetField' ],
 165                         'section' => 'target',
 166                 ];
 167
 168                 $a['Editing'] = [
 169                         'type' => 'check',
 170                         'label-message' => 'block-prevent-edit',
 171                         'default' => true,
 172                         'section' => 'actions',
 173                         'disabled' => $enablePartialBlocks ? false : true,
 174                 ];
 175
 176                 if ( $enablePartialBlocks ) {
 177                         $a['EditingRestriction'] = [
 178                                 'type' => 'radio',
 179                                 'cssclass' => 'mw-block-editing-restriction',
 180                                 'options' => [
 181                                         $this->msg( 'ipb-sitewide' )->escaped() .
 182                                                 new \OOUI\LabelWidget( [
 183                                                         'classes' => [ 'oo-ui-inline-help' ],
 184                                                         'label' => $this->msg( 'ipb-sitewide-help' )->text(),
 185                                                 ] ) => 'sitewide',
 186                                         $this->msg( 'ipb-partial' )->escaped() .
 187                                                 new \OOUI\LabelWidget( [
 188                                                         'classes' => [ 'oo-ui-inline-help' ],
 189                                                         'label' => $this->msg( 'ipb-partial-help' )->text(),
 190                                                 ] ) => 'partial',
 191                                 ],
 192                                 'section' => 'actions',
 193                         ];
 194                         $a['PageRestrictions'] = [
 195                                 'type' => 'titlesmultiselect',
 196                                 'label' => $this->msg( 'ipb-pages-label' )->text(),
 197                                 'exists' => true,
 198                                 'max' => 10,
 199                                 'cssclass' => 'mw-block-restriction',
 200                                 'showMissing' => false,
 201                                 'excludeDynamicNamespaces' => true,
 202                                 'input' => [
 203                                         'autocomplete' => false
 204                                 ],
 205                                 'section' => 'actions',
 206                         ];
 207                         $a['NamespaceRestrictions'] = [
 208                                 'type' => 'namespacesmultiselect',
 209                                 'label' => $this->msg( 'ipb-namespaces-label' )->text(),
 210                                 'exists' => true,
 211                                 'cssclass' => 'mw-block-restriction',
 212                                 'input' => [
 213                                         'autocomplete' => false
 214                                 ],
 215                                 'section' => 'actions',
 216                         ];
 217                 }
 218
 219                 $a['CreateAccount'] = [
 220                         'type' => 'check',
 221                         'label-message' => 'ipbcreateaccount',
 222                         'default' => true,
 223                         'section' => 'actions',
 224                 ];
 225
 226                 if ( self::canBlockEmail( $user ) ) {
 227                         $a['DisableEmail'] = [
 228                                 'type' => 'check',
 229                                 'label-message' => 'ipbemailban',
 230                                 'section' => 'actions',
 231                         ];
 232                 }
 233
 234                 if ( $blockAllowsUTEdit ) {
 235                         $a['DisableUTEdit'] = [
 236                                 'type' => 'check',
 237                                 'label-message' => 'ipb-disableusertalk',
 238                                 'default' => false,
 239                                 'section' => 'actions',
 240                         ];
 241                 }
 242
 243                 $a['Expiry'] = [
 244                         'type' => 'expiry',
 245                         'required' => true,
 246                         'options' => $suggestedDurations,
 247                         'default' => $this->msg( 'ipb-default-expiry' )->inContentLanguage()->text(),
 248                         'section' => 'expiry',
 249                 ];
 250
 251                 $a['Reason'] = [
 252                         'type' => 'selectandother',
 253                         // HTML maxlength uses "UTF-16 code units", which means that characters outside BMP
 254                         // (e.g. emojis) count for two each. This limit is overridden in JS to instead count
 255                         // Unicode codepoints.
 256                         'maxlength' => CommentStore::COMMENT_CHARACTER_LIMIT,
 257                         'maxlength-unit' => 'codepoints',
 258                         'options-message' => 'ipbreason-dropdown',
 259                         'section' => 'reason',
 260                 ];
 261
 262                 $a['AutoBlock'] = [
 263                         'type' => 'check',
 264                         'label-message' => 'ipbenableautoblock',
 265                         'default' => true,
 266                         'section' => 'options',
 267                 ];
 268
 269                 # Allow some users to hide name from block log, blocklist and listusers
 270                 if ( $user->isAllowed( 'hideuser' ) ) {
 271                         $a['HideUser'] = [
 272                                 'type' => 'check',
 273                                 'label-message' => 'ipbhidename',
 274                                 'cssclass' => 'mw-block-hideuser',
 275                                 'section' => 'options',
 276                         ];
 277                 }
 278
 279                 # Watchlist their user page? (Only if user is logged in)
 280                 if ( $user->isLoggedIn() ) {
 281                         $a['Watch'] = [
 282                                 'type' => 'check',
 283                                 'label-message' => 'ipbwatchuser',
 284                                 'section' => 'options',
 285                         ];
 286                 }
 287
 288                 $a['HardBlock'] = [
 289                         'type' => 'check',
 290                         'label-message' => 'ipb-hardblock',
 291                         'default' => false,
 292                         'section' => 'options',
 293                 ];
 294
 295                 # This is basically a copy of the Target field, but the user can't change it, so we
 296                 # can see if the warnings we maybe showed to the user before still apply
 297                 $a['PreviousTarget'] = [
 298                         'type' => 'hidden',
 299                         'default' => false,
 300                 ];
 301
 302                 # We'll turn this into a checkbox if we need to
 303                 $a['Confirm'] = [
 304                         'type' => 'hidden',
 305                         'default' => '',
 306                         'label-message' => 'ipb-confirm',
 307                         'cssclass' => 'mw-block-confirm',
 308                 ];
 309
 310                 $this->maybeAlterFormDefaults( $a );
 311
 312                 // Allow extensions to add more fields
 313                 Hooks::run( 'SpecialBlockModifyFormFields', [ $this, &$a ] );
 314
 315                 return $a;
 316         }
 317
 318         /**
 319          * If the user has already been blocked with similar settings, load that block
 320          * and change the defaults for the form fields to match the existing settings.
 321          * @param array &$fields HTMLForm descriptor array
 322          */
 323         protected function maybeAlterFormDefaults( &$fields ) {
 324                 # This will be overwritten by request data
 325                 $fields['Target']['default'] = (string)$this->target;
 326
 327                 if ( $this->target ) {
 328                         $status = self::validateTarget( $this->target, $this->getUser() );
 329                         if ( !$status->isOK() ) {
 330                                 $errors = $status->getErrorsArray();
 331                                 $this->preErrors = array_merge( $this->preErrors, $errors );
 332                         }
 333                 }
 334
 335                 # This won't be
 336                 $fields['PreviousTarget']['default'] = (string)$this->target;
 337
 338                 $block = Block::newFromTarget( $this->target );
 339
 340                 // Populate fields if there is a block that is not an autoblock; if it is a range
 341                 // block, only populate the fields if the range is the same as $this->target
 342                 if ( $block instanceof Block && $block->getType() !== Block::TYPE_AUTO
 343                         && ( $this->type != Block::TYPE_RANGE
 344                                 || $block->getTarget() == $this->target )
 345                 ) {
 346                         $fields['HardBlock']['default'] = $block->isHardblock();
 347                         $fields['CreateAccount']['default'] = $block->isCreateAccountBlocked();
 348                         $fields['AutoBlock']['default'] = $block->isAutoblocking();
 349
 350                         if ( isset( $fields['DisableEmail'] ) ) {
 351                                 $fields['DisableEmail']['default'] = $block->isEmailBlocked();
 352                         }
 353
 354                         if ( isset( $fields['HideUser'] ) ) {
 355                                 $fields['HideUser']['default'] = $block->getHideName();
 356                         }
 357
 358                         if ( isset( $fields['DisableUTEdit'] ) ) {
 359                                 $fields['DisableUTEdit']['default'] = !$block->isUsertalkEditAllowed();
 360                         }
 361
 362                         // If the username was hidden (ipb_deleted == 1), don't show the reason
 363                         // unless this user also has rights to hideuser: T37839
 364                         if ( !$block->getHideName() || $this->getUser()->isAllowed( 'hideuser' ) ) {
 365                                 $fields['Reason']['default'] = $block->getReason();
 366                         } else {
 367                                 $fields['Reason']['default'] = '';
 368                         }
 369
 370                         if ( $this->getRequest()->wasPosted() ) {
 371                                 # Ok, so we got a POST submission asking us to reblock a user.  So show the
 372                                 # confirm checkbox; the user will only see it if they haven't previously
 373                                 $fields['Confirm']['type'] = 'check';
 374                         } else {
 375                                 # We got a target, but it wasn't a POST request, so the user must have gone
 376                                 # to a link like [[Special:Block/User]].  We don't need to show the checkbox
 377                                 # as long as they go ahead and block *that* user
 378                                 $fields['Confirm']['default'] = 1;
 379                         }
 380
 381                         if ( $block->getExpiry() == 'infinity' ) {
 382                                 $fields['Expiry']['default'] = 'infinite';
 383                         } else {
 384                                 $fields['Expiry']['default'] = wfTimestamp( TS_RFC2822, $block->getExpiry() );
 385                         }
 386
 387                         $this->alreadyBlocked = true;
 388                         $this->preErrors[] = [ 'ipb-needreblock', wfEscapeWikiText( (string)$block->getTarget() ) ];
 389                 }
 390
 391                 if ( $this->alreadyBlocked || $this->getRequest()->wasPosted()
 392                         || $this->getRequest()->getCheck( 'wpCreateAccount' )
 393                 ) {
 394                         $this->getOutput()->addJsConfigVars( 'wgCreateAccountDirty', true );
 395                 }
 396
 397                 # We always need confirmation to do HideUser
 398                 if ( $this->requestedHideUser ) {
 399                         $fields['Confirm']['type'] = 'check';
 400                         unset( $fields['Confirm']['default'] );
 401                         $this->preErrors[] = [ 'ipb-confirmhideuser', 'ipb-confirmaction' ];
 402                 }
 403
 404                 # Or if the user is trying to block themselves
 405                 if ( (string)$this->target === $this->getUser()->getName() ) {
 406                         $fields['Confirm']['type'] = 'check';
 407                         unset( $fields['Confirm']['default'] );
 408                         $this->preErrors[] = [ 'ipb-blockingself', 'ipb-confirmaction' ];
 409                 }
 410
 411                 if ( $this->getConfig()->get( 'EnablePartialBlocks' ) ) {
 412                         if ( $block instanceof Block && !$block->isSitewide() ) {
 413                                 $fields['EditingRestriction']['default'] = 'partial';
 414                         } else {
 415                                 $fields['EditingRestriction']['default'] = 'sitewide';
 416                         }
 417
 418                         if ( $block instanceof Block ) {
 419                                 $pageRestrictions = [];
 420                                 $namespaceRestrictions = [];
 421                                 foreach ( $block->getRestrictions() as $restriction ) {
 422                                         switch ( $restriction->getType() ) {
 423                                                 case PageRestriction::TYPE:
 424                                                         if ( $restriction->getTitle() ) {
 425                                                                 $pageRestrictions[] = $restriction->getTitle()->getPrefixedText();
 426                                                         }
 427                                                         break;
 428                                                 case NamespaceRestriction::TYPE:
 429                                                         $namespaceRestrictions[] = $restriction->getValue();
 430                                                         break;
 431                                         }
 432                                 }
 433
 434                                 if (
 435                                         !$block->isSitewide() &&
 436                                         empty( $pageRestrictions ) &&
 437                                         empty( $namespaceRestrictions )
 438                                 ) {
 439                                         $fields['Editing']['default'] = false;
 440                                 }
 441
 442                                 // Sort the restrictions so they are in alphabetical order.
 443                                 sort( $pageRestrictions );
 444                                 $fields['PageRestrictions']['default'] = implode( "\n", $pageRestrictions );
 445                                 sort( $namespaceRestrictions );
 446                                 $fields['NamespaceRestrictions']['default'] = implode( "\n", $namespaceRestrictions );
 447                         }
 448                 }
 449         }
 450
 451         /**
 452          * Add header elements like block log entries, etc.
 453          * @return string
 454          */
 455         protected function preText() {
 456                 $this->getOutput()->addModuleStyles( [
 457                         'mediawiki.widgets.TagMultiselectWidget.styles',
 458                         'mediawiki.special',
 459                 ] );
 460                 $this->getOutput()->addModules( [ 'mediawiki.special.block' ] );
 461
 462                 $blockCIDRLimit = $this->getConfig()->get( 'BlockCIDRLimit' );
 463                 $text = $this->msg( 'blockiptext', $blockCIDRLimit['IPv4'], $blockCIDRLimit['IPv6'] )->parse();
 464
 465                 $otherBlockMessages = [];
 466                 if ( $this->target !== null ) {
 467                         $targetName = $this->target;
 468                         if ( $this->target instanceof User ) {
 469                                 $targetName = $this->target->getName();
 470                         }
 471                         # Get other blocks, i.e. from GlobalBlocking or TorBlock extension
 472                         Hooks::run( 'OtherBlockLogLink', [ &$otherBlockMessages, $targetName ] );
 473
 474                         if ( count( $otherBlockMessages ) ) {
 475                                 $s = Html::rawElement(
 476                                         'h2',
 477                                         [],
 478                                         $this->msg( 'ipb-otherblocks-header', count( $otherBlockMessages ) )->parse()
 479                                 ) . "\n";
 480
 481                                 $list = '';
 482
 483                                 foreach ( $otherBlockMessages as $link ) {
 484                                         $list .= Html::rawElement( 'li', [], $link ) . "\n";
 485                                 }
 486
 487                                 $s .= Html::rawElement(
 488                                         'ul',
 489                                         [ 'class' => 'mw-blockip-alreadyblocked' ],
 490                                         $list
 491                                 ) . "\n";
 492
 493                                 $text .= $s;
 494                         }
 495                 }
 496
 497                 return $text;
 498         }
 499
 500         /**
 501          * Add footer elements to the form
 502          * @return string
 503          */
 504         protected function postText() {
 505                 $links = [];
 506
 507                 $this->getOutput()->addModuleStyles( 'mediawiki.special' );
 508
 509                 $linkRenderer = $this->getLinkRenderer();
 510                 # Link to the user's contributions, if applicable
 511                 if ( $this->target instanceof User ) {
 512                         $contribsPage = SpecialPage::getTitleFor( 'Contributions', $this->target->getName() );
 513                         $links[] = $linkRenderer->makeLink(
 514                                 $contribsPage,
 515                                 $this->msg( 'ipb-blocklist-contribs', $this->target->getName() )->text()
 516                         );
 517                 }
 518
 519                 # Link to unblock the specified user, or to a blank unblock form
 520                 if ( $this->target instanceof User ) {
 521                         $message = $this->msg(
 522                                 'ipb-unblock-addr',
 523                                 wfEscapeWikiText( $this->target->getName() )
 524                         )->parse();
 525                         $list = SpecialPage::getTitleFor( 'Unblock', $this->target->getName() );
 526                 } else {
 527                         $message = $this->msg( 'ipb-unblock' )->parse();
 528                         $list = SpecialPage::getTitleFor( 'Unblock' );
 529                 }
 530                 $links[] = $linkRenderer->makeKnownLink(
 531                         $list,
 532                         new HtmlArmor( $message )
 533                 );
 534
 535                 # Link to the block list
 536                 $links[] = $linkRenderer->makeKnownLink(
 537                         SpecialPage::getTitleFor( 'BlockList' ),
 538                         $this->msg( 'ipb-blocklist' )->text()
 539                 );
 540
 541                 $user = $this->getUser();
 542
 543                 # Link to edit the block dropdown reasons, if applicable
 544                 if ( $user->isAllowed( 'editinterface' ) ) {
 545                         $links[] = $linkRenderer->makeKnownLink(
 546                                 $this->msg( 'ipbreason-dropdown' )->inContentLanguage()->getTitle(),
 547                                 $this->msg( 'ipb-edit-dropdown' )->text(),
 548                                 [],
 549                                 [ 'action' => 'edit' ]
 550                         );
 551                 }
 552
 553                 $text = Html::rawElement(
 554                         'p',
 555                         [ 'class' => 'mw-ipb-conveniencelinks' ],
 556                         $this->getLanguage()->pipeList( $links )
 557                 );
 558
 559                 $userTitle = self::getTargetUserTitle( $this->target );
 560                 if ( $userTitle ) {
 561                         # Get relevant extracts from the block and suppression logs, if possible
 562                         $out = '';
 563
 564                         LogEventsList::showLogExtract(
 565                                 $out,
 566                                 'block',
 567                                 $userTitle,
 568                                 '',
 569                                 [
 570                                         'lim' => 10,
 571                                         'msgKey' => [ 'blocklog-showlog', $userTitle->getText() ],
 572                                         'showIfEmpty' => false
 573                                 ]
 574                         );
 575                         $text .= $out;
 576
 577                         # Add suppression block entries if allowed
 578                         if ( $user->isAllowed( 'suppressionlog' ) ) {
 579                                 LogEventsList::showLogExtract(
 580                                         $out,
 581                                         'suppress',
 582                                         $userTitle,
 583                                         '',
 584                                         [
 585                                                 'lim' => 10,
 586                                                 'conds' => [ 'log_action' => [ 'block', 'reblock', 'unblock' ] ],
 587                                                 'msgKey' => [ 'blocklog-showsuppresslog', $userTitle->getText() ],
 588                                                 'showIfEmpty' => false
 589                                         ]
 590                                 );
 591
 592                                 $text .= $out;
 593                         }
 594                 }
 595
 596                 return $text;
 597         }
 598
 599         /**
 600          * Get a user page target for things like logs.
 601          * This handles account and IP range targets.
 602          * @param User|string $target
 603          * @return Title|null
 604          */
 605         protected static function getTargetUserTitle( $target ) {
 606                 if ( $target instanceof User ) {
 607                         return $target->getUserPage();
 608                 } elseif ( IP::isIPAddress( $target ) ) {
 609                         return Title::makeTitleSafe( NS_USER, $target );
 610                 }
 611
 612                 return null;
 613         }
 614
 615         /**
 616          * Determine the target of the block, and the type of target
 617          * @todo Should be in Block.php?
 618          * @param string $par Subpage parameter passed to setup, or data value from
 619          *     the HTMLForm
 620          * @param WebRequest|null $request Optionally try and get data from a request too
 621          * @return array [ User|string|null, Block::TYPE_ constant|null ]
 622          * @phan-return array{0:User|string|null,1:int|null}
 623          */
 624         public static function getTargetAndType( $par, WebRequest $request = null ) {
 625                 $i = 0;
 626                 $target = null;
 627
 628                 while ( true ) {
 629                         switch ( $i++ ) {
 630                                 case 0:
 631                                         # The HTMLForm will check wpTarget first and only if it doesn't get
 632                                         # a value use the default, which will be generated from the options
 633                                         # below; so this has to have a higher precedence here than $par, or
 634                                         # we could end up with different values in $this->target and the HTMLForm!
 635                                         if ( $request instanceof WebRequest ) {
 636                                                 $target = $request->getText( 'wpTarget', null );
 637                                         }
 638                                         break;
 639                                 case 1:
 640                                         $target = $par;
 641                                         break;
 642                                 case 2:
 643                                         if ( $request instanceof WebRequest ) {
 644                                                 $target = $request->getText( 'ip', null );
 645                                         }
 646                                         break;
 647                                 case 3:
 648                                         # B/C @since 1.18
 649                                         if ( $request instanceof WebRequest ) {
 650                                                 $target = $request->getText( 'wpBlockAddress', null );
 651                                         }
 652                                         break;
 653                                 case 4:
 654                                         break 2;
 655                         }
 656
 657                         list( $target, $type ) = Block::parseTarget( $target );
 658
 659                         if ( $type !== null ) {
 660                                 return [ $target, $type ];
 661                         }
 662                 }
 663
 664                 return [ null, null ];
 665         }
 666
 667         /**
 668          * HTMLForm field validation-callback for Target field.
 669          * @since 1.18
 670          * @param string $value
 671          * @param array $alldata
 672          * @param HTMLForm $form
 673          * @return Message
 674          */
 675         public static function validateTargetField( $value, $alldata, $form ) {
 676                 $status = self::validateTarget( $value, $form->getUser() );
 677                 if ( !$status->isOK() ) {
 678                         $errors = $status->getErrorsArray();
 679
 680                         return $form->msg( ...$errors[0] );
 681                 } else {
 682                         return true;
 683                 }
 684         }
 685
 686         /**
 687          * Validate a block target.
 688          *
 689          * @since 1.21
 690          * @param string $value Block target to check
 691          * @param User $user Performer of the block
 692          * @return Status
 693          */
 694         public static function validateTarget( $value, User $user ) {
 695                 global $wgBlockCIDRLimit;
 696
 697                 /** @var User $target */
 698                 list( $target, $type ) = self::getTargetAndType( $value );
 699                 $status = Status::newGood( $target );
 700
 701                 if ( $type == Block::TYPE_USER ) {
 702                         if ( $target->isAnon() ) {
 703                                 $status->fatal(
 704                                         'nosuchusershort',
 705                                         wfEscapeWikiText( $target->getName() )
 706                                 );
 707                         }
 708
 709                         $unblockStatus = self::checkUnblockSelf( $target, $user );
 710                         if ( $unblockStatus !== true ) {
 711                                 $status->fatal( 'badaccess', $unblockStatus );
 712                         }
 713                 } elseif ( $type == Block::TYPE_RANGE ) {
 714                         list( $ip, $range ) = explode( '/', $target, 2 );
 715
 716                         if (
 717                                 ( IP::isIPv4( $ip ) && $wgBlockCIDRLimit['IPv4'] == 32 ) ||
 718                                 ( IP::isIPv6( $ip ) && $wgBlockCIDRLimit['IPv6'] == 128 )
 719                         ) {
 720                                 // Range block effectively disabled
 721                                 $status->fatal( 'range_block_disabled' );
 722                         }
 723
 724                         if (
 725                                 ( IP::isIPv4( $ip ) && $range > 32 ) ||
 726                                 ( IP::isIPv6( $ip ) && $range > 128 )
 727                         ) {
 728                                 // Dodgy range
 729                                 $status->fatal( 'ip_range_invalid' );
 730                         }
 731
 732                         if ( IP::isIPv4( $ip ) && $range < $wgBlockCIDRLimit['IPv4'] ) {
 733                                 $status->fatal( 'ip_range_toolarge', $wgBlockCIDRLimit['IPv4'] );
 734                         }
 735
 736                         if ( IP::isIPv6( $ip ) && $range < $wgBlockCIDRLimit['IPv6'] ) {
 737                                 $status->fatal( 'ip_range_toolarge', $wgBlockCIDRLimit['IPv6'] );
 738                         }
 739                 } elseif ( $type == Block::TYPE_IP ) {
 740                         # All is well
 741                 } else {
 742                         $status->fatal( 'badipaddress' );
 743                 }
 744
 745                 return $status;
 746         }
 747
 748         /**
 749          * Given the form data, actually implement a block. This is also called from ApiBlock.
 750          *
 751          * @param array $data
 752          * @param IContextSource $context
 753          * @return bool|string
 754          */
 755         public static function processForm( array $data, IContextSource $context ) {
 756                 global $wgBlockAllowsUTEdit, $wgHideUserContribLimit;
 757
 758                 $performer = $context->getUser();
 759                 $enablePartialBlocks = $context->getConfig()->get( 'EnablePartialBlocks' );
 760                 $isPartialBlock = $enablePartialBlocks &&
 761                         isset( $data['EditingRestriction'] ) &&
 762                         $data['EditingRestriction'] === 'partial';
 763
 764                 // Handled by field validator callback
 765                 // self::validateTargetField( $data['Target'] );
 766
 767                 # This might have been a hidden field or a checkbox, so interesting data
 768                 # can come from it
 769                 $data['Confirm'] = !in_array( $data['Confirm'], [ '', '0', null, false ], true );
 770
 771                 /** @var User $target */
 772                 list( $target, $type ) = self::getTargetAndType( $data['Target'] );
 773                 if ( $type == Block::TYPE_USER ) {
 774                         $user = $target;
 775                         $target = $user->getName();
 776                         $userId = $user->getId();
 777
 778                         # Give admins a heads-up before they go and block themselves.  Much messier
 779                         # to do this for IPs, but it's pretty unlikely they'd ever get the 'block'
 780                         # permission anyway, although the code does allow for it.
 781                         # Note: Important to use $target instead of $data['Target']
 782                         # since both $data['PreviousTarget'] and $target are normalized
 783                         # but $data['target'] gets overridden by (non-normalized) request variable
 784                         # from previous request.
 785                         if ( $target === $performer->getName() &&
 786                                 ( $data['PreviousTarget'] !== $target || !$data['Confirm'] )
 787                         ) {
 788                                 return [ 'ipb-blockingself', 'ipb-confirmaction' ];
 789                         }
 790                 } elseif ( $type == Block::TYPE_RANGE ) {
 791                         $user = null;
 792                         $userId = 0;
 793                 } elseif ( $type == Block::TYPE_IP ) {
 794                         $user = null;
 795                         $target = $target->getName();
 796                         $userId = 0;
 797                 } else {
 798                         # This should have been caught in the form field validation
 799                         return [ 'badipaddress' ];
 800                 }
 801
 802                 $expiryTime = self::parseExpiryInput( $data['Expiry'] );
 803
 804                 if (
 805                         // an expiry time is needed
 806                         ( strlen( $data['Expiry'] ) == 0 ) ||
 807                         // can't be a larger string as 50 (it should be a time format in any way)
 808                         ( strlen( $data['Expiry'] ) > 50 ) ||
 809                         // check, if the time could be parsed
 810                         !$expiryTime
 811                 ) {
 812                         return [ 'ipb_expiry_invalid' ];
 813                 }
 814
 815                 // an expiry time should be in the future, not in the
 816                 // past (wouldn't make any sense) - bug T123069
 817                 if ( $expiryTime < wfTimestampNow() ) {
 818                         return [ 'ipb_expiry_old' ];
 819                 }
 820
 821                 if ( !isset( $data['DisableEmail'] ) ) {
 822                         $data['DisableEmail'] = false;
 823                 }
 824
 825                 # If the user has done the form 'properly', they won't even have been given the
 826                 # option to suppress-block unless they have the 'hideuser' permission
 827                 if ( !isset( $data['HideUser'] ) ) {
 828                         $data['HideUser'] = false;
 829                 }
 830
 831                 if ( $data['HideUser'] ) {
 832                         if ( !$performer->isAllowed( 'hideuser' ) ) {
 833                                 # this codepath is unreachable except by a malicious user spoofing forms,
 834                                 # or by race conditions (user has hideuser and block rights, loads block form,
 835                                 # and loses hideuser rights before submission); so need to fail completely
 836                                 # rather than just silently disable hiding
 837                                 return [ 'badaccess-group0' ];
 838                         }
 839
 840                         if ( $isPartialBlock ) {
 841                                 return [ 'ipb_hide_partial' ];
 842                         }
 843
 844                         # Recheck params here...
 845                         if ( $type != Block::TYPE_USER ) {
 846                                 $data['HideUser'] = false; # IP users should not be hidden
 847                         } elseif ( !wfIsInfinity( $data['Expiry'] ) ) {
 848                                 # Bad expiry.
 849                                 return [ 'ipb_expiry_temp' ];
 850                         } elseif ( $wgHideUserContribLimit !== false
 851                                 && $user->getEditCount() > $wgHideUserContribLimit
 852                         ) {
 853                                 # Typically, the user should have a handful of edits.
 854                                 # Disallow hiding users with many edits for performance.
 855                                 return [ [ 'ipb_hide_invalid',
 856                                         Message::numParam( $wgHideUserContribLimit ) ] ];
 857                         } elseif ( !$data['Confirm'] ) {
 858                                 return [ 'ipb-confirmhideuser', 'ipb-confirmaction' ];
 859                         }
 860                 }
 861
 862                 # Create block object.
 863                 $block = new Block();
 864                 $block->setTarget( $target );
 865                 $block->setBlocker( $performer );
 866                 $block->setReason( $data['Reason'][0] );
 867                 $block->setExpiry( $expiryTime );
 868                 $block->isCreateAccountBlocked( $data['CreateAccount'] );
 869                 $block->isUsertalkEditAllowed( !$wgBlockAllowsUTEdit || !$data['DisableUTEdit'] );
 870                 $block->isEmailBlocked( $data['DisableEmail'] );
 871                 $block->isHardblock( $data['HardBlock'] );
 872                 $block->isAutoblocking( $data['AutoBlock'] );
 873                 $block->setHideName( $data['HideUser'] );
 874
 875                 if ( $isPartialBlock ) {
 876                         $block->isSitewide( false );
 877                 }
 878
 879                 $reason = [ 'hookaborted' ];
 880                 if ( !Hooks::run( 'BlockIp', [ &$block, &$performer, &$reason ] ) ) {
 881                         return $reason;
 882                 }
 883
 884                 $pageRestrictions = [];
 885                 $namespaceRestrictions = [];
 886                 if ( $enablePartialBlocks ) {
 887                         if ( $data['PageRestrictions'] !== '' ) {
 888                                 $pageRestrictions = array_map( function ( $text ) {
 889                                         $title = Title::newFromText( $text );
 890                                         // Use the link cache since the title has already been loaded when
 891                                         // the field was validated.
 892                                         $restriction = new PageRestriction( 0, $title->getArticleID() );
 893                                         $restriction->setTitle( $title );
 894                                         return $restriction;
 895                                 }, explode( "\n", $data['PageRestrictions'] ) );
 896                         }
 897                         if ( $data['NamespaceRestrictions'] !== '' ) {
 898                                 $namespaceRestrictions = array_map( function ( $id ) {
 899                                         return new NamespaceRestriction( 0, $id );
 900                                 }, explode( "\n", $data['NamespaceRestrictions'] ) );
 901                         }
 902
 903                         $restrictions = ( array_merge( $pageRestrictions, $namespaceRestrictions ) );
 904                         $block->setRestrictions( $restrictions );
 905                 }
 906
 907                 $priorBlock = null;
 908                 # Try to insert block. Is there a conflicting block?
 909                 $status = $block->insert();
 910                 if ( !$status ) {
 911                         # Indicates whether the user is confirming the block and is aware of
 912                         # the conflict (did not change the block target in the meantime)
 913                         $blockNotConfirmed = !$data['Confirm'] || ( array_key_exists( 'PreviousTarget', $data )
 914                                 && $data['PreviousTarget'] !== $target );
 915
 916                         # Special case for API - T34434
 917                         $reblockNotAllowed = ( array_key_exists( 'Reblock', $data ) && !$data['Reblock'] );
 918
 919                         # Show form unless the user is already aware of this...
 920                         if ( $blockNotConfirmed || $reblockNotAllowed ) {
 921                                 return [ [ 'ipb_already_blocked', $block->getTarget() ] ];
 922                                 # Otherwise, try to update the block...
 923                         } else {
 924                                 # This returns direct blocks before autoblocks/rangeblocks, since we should
 925                                 # be sure the user is blocked by now it should work for our purposes
 926                                 $currentBlock = Block::newFromTarget( $target );
 927                                 if ( $block->equals( $currentBlock ) ) {
 928                                         return [ [ 'ipb_already_blocked', $block->getTarget() ] ];
 929                                 }
 930                                 # If the name was hidden and the blocking user cannot hide
 931                                 # names, then don't allow any block changes...
 932                                 if ( $currentBlock->getHideName() && !$performer->isAllowed( 'hideuser' ) ) {
 933                                         return [ 'cant-see-hidden-user' ];
 934                                 }
 935
 936                                 $priorBlock = clone $currentBlock;
 937                                 $currentBlock->isHardblock( $block->isHardblock() );
 938                                 $currentBlock->isCreateAccountBlocked( $block->isCreateAccountBlocked() );
 939                                 $currentBlock->setExpiry( $block->getExpiry() );
 940                                 $currentBlock->isAutoblocking( $block->isAutoblocking() );
 941                                 $currentBlock->setHideName( $block->getHideName() );
 942                                 $currentBlock->isEmailBlocked( $block->isEmailBlocked() );
 943                                 $currentBlock->isUsertalkEditAllowed( $block->isUsertalkEditAllowed() );
 944                                 $currentBlock->setReason( $block->getReason() );
 945
 946                                 if ( $enablePartialBlocks ) {
 947                                         // Maintain the sitewide status. If partial blocks is not enabled,
 948                                         // saving the block will result in a sitewide block.
 949                                         $currentBlock->isSitewide( $block->isSitewide() );
 950
 951                                         // Set the block id of the restrictions.
 952                                         $currentBlock->setRestrictions(
 953                                                 BlockRestriction::setBlockId( $currentBlock->getId(), $restrictions )
 954                                         );
 955                                 }
 956
 957                                 $status = $currentBlock->update();
 958                                 // TODO handle failure
 959
 960                                 $logaction = 'reblock';
 961
 962                                 # Unset _deleted fields if requested
 963                                 if ( $currentBlock->getHideName() && !$data['HideUser'] ) {
 964                                         RevisionDeleteUser::unsuppressUserName( $target, $userId );
 965                                 }
 966
 967                                 # If hiding/unhiding a name, this should go in the private logs
 968                                 if ( (bool)$currentBlock->getHideName() ) {
 969                                         $data['HideUser'] = true;
 970                                 }
 971
 972                                 $block = $currentBlock;
 973                         }
 974                 } else {
 975                         $logaction = 'block';
 976                 }
 977
 978                 Hooks::run( 'BlockIpComplete', [ $block, $performer, $priorBlock ] );
 979
 980                 # Set *_deleted fields if requested
 981                 if ( $data['HideUser'] ) {
 982                         RevisionDeleteUser::suppressUserName( $target, $userId );
 983                 }
 984
 985                 # Can't watch a rangeblock
 986                 if ( $type != Block::TYPE_RANGE && $data['Watch'] ) {
 987                         WatchAction::doWatch(
 988                                 Title::makeTitle( NS_USER, $target ),
 989                                 $performer,
 990                                 User::IGNORE_USER_RIGHTS
 991                         );
 992                 }
 993
 994                 # Block constructor sanitizes certain block options on insert
 995                 $data['BlockEmail'] = $block->isEmailBlocked();
 996                 $data['AutoBlock'] = $block->isAutoblocking();
 997
 998                 # Prepare log parameters
 999                 $logParams = [];
1000                 $logParams['5::duration'] = $data['Expiry'];
1001                 $logParams['6::flags'] = self::blockLogFlags( $data, $type );
1002                 $logParams['sitewide'] = $block->isSitewide();
1003
1004                 if ( $enablePartialBlocks && !$block->isSitewide() ) {
1005                         if ( $data['PageRestrictions'] !== '' ) {
1006                                 $logParams['7::restrictions']['pages'] = explode( "\n", $data['PageRestrictions'] );
1007                         }
1008
1009                         if ( $data['NamespaceRestrictions'] !== '' ) {
1010                                 $logParams['7::restrictions']['namespaces'] = explode( "\n", $data['NamespaceRestrictions'] );
1011                         }
1012                 }
1013
1014                 # Make log entry, if the name is hidden, put it in the suppression log
1015                 $log_type = $data['HideUser'] ? 'suppress' : 'block';
1016                 $logEntry = new ManualLogEntry( $log_type, $logaction );
1017                 $logEntry->setTarget( Title::makeTitle( NS_USER, $target ) );
1018                 $logEntry->setComment( $data['Reason'][0] );
1019                 $logEntry->setPerformer( $performer );
1020                 $logEntry->setParameters( $logParams );
1021                 # Relate log ID to block ID (T27763)
1022                 $logEntry->setRelations( [ 'ipb_id' => $block->getId() ] );
1023                 $logId = $logEntry->insert();
1024
1025                 if ( !empty( $data['Tags'] ) ) {
1026                         $logEntry->setTags( $data['Tags'] );
1027                 }
1028
1029                 $logEntry->publish( $logId );
1030
1031                 return true;
1032         }
1033
1034         /**
1035          * Get an array of suggested block durations from MediaWiki:Ipboptions
1036          * @todo FIXME: This uses a rather odd syntax for the options, should it be converted
1037          *     to the standard "**<duration>|<displayname>" format?
1038          * @param Language|null $lang The language to get the durations in, or null to use
1039          *     the wiki's content language
1040          * @param bool $includeOther Whether to include the 'other' option in the list of
1041          *     suggestions
1042          * @return array
1043          */
1044         public static function getSuggestedDurations( Language $lang = null, $includeOther = true ) {
1045                 $a = [];
1046                 $msg = $lang === null
1047                         ? wfMessage( 'ipboptions' )->inContentLanguage()->text()
1048                         : wfMessage( 'ipboptions' )->inLanguage( $lang )->text();
1049
1050                 if ( $msg == '-' ) {
1051                         return [];
1052                 }
1053
1054                 foreach ( explode( ',', $msg ) as $option ) {
1055                         if ( strpos( $option, ':' ) === false ) {
1056                                 $option = "$option:$option";
1057                         }
1058
1059                         list( $show, $value ) = explode( ':', $option );
1060                         $a[$show] = $value;
1061                 }
1062
1063                 if ( $a && $includeOther ) {
1064                         // if options exist, add other to the end instead of the begining (which
1065                         // is what happens by default).
1066                         $a[ wfMessage( 'ipbother' )->text() ] = 'other';
1067                 }
1068
1069                 return $a;
1070         }
1071
1072         /**
1073          * Convert a submitted expiry time, which may be relative ("2 weeks", etc) or absolute
1074          * ("24 May 2034", etc), into an absolute timestamp we can put into the database.
1075          *
1076          * @todo strtotime() only accepts English strings. This means the expiry input
1077          *       can only be specified in English.
1078          * @see https://secure.php.net/manual/en/function.strtotime.php
1079          *
1080          * @param string $expiry Whatever was typed into the form
1081          * @return string|bool Timestamp or 'infinity' or false on error.
1082          */
1083         public static function parseExpiryInput( $expiry ) {
1084                 if ( wfIsInfinity( $expiry ) ) {
1085                         return 'infinity';
1086                 }
1087
1088                 $expiry = strtotime( $expiry );
1089
1090                 if ( $expiry < 0 || $expiry === false ) {
1091                         return false;
1092                 }
1093
1094                 return wfTimestamp( TS_MW, $expiry );
1095         }
1096
1097         /**
1098          * Can we do an email block?
1099          * @param User $user The sysop wanting to make a block
1100          * @return bool
1101          */
1102         public static function canBlockEmail( $user ) {
1103                 global $wgEnableUserEmail, $wgSysopEmailBans;
1104
1105                 return ( $wgEnableUserEmail && $wgSysopEmailBans && $user->isAllowed( 'blockemail' ) );
1106         }
1107
1108         /**
1109          * T17810: blocked admins should not be able to block/unblock
1110          * others, and probably shouldn't be able to unblock themselves
1111          * either.
1112          *
1113          * Exception: Users can block the user who blocked them, to reduce
1114          * advantage of a malicious account blocking all admins (T150826)
1115          *
1116          * @param User|int|string|null $target Target to block or unblock; could be a User object,
1117          *   or a user ID or username, or null when the target is not known yet (e.g. when
1118          *   displaying Special:Block)
1119          * @param User $performer User doing the request
1120          * @return bool|string True or error message key
1121          */
1122         public static function checkUnblockSelf( $target, User $performer ) {
1123                 if ( is_int( $target ) ) {
1124                         $target = User::newFromId( $target );
1125                 } elseif ( is_string( $target ) ) {
1126                         $target = User::newFromName( $target );
1127                 }
1128                 if ( $performer->isBlocked() ) {
1129                         if ( $target instanceof User && $target->getId() == $performer->getId() ) {
1130                                 # User is trying to unblock themselves
1131                                 if ( $performer->isAllowed( 'unblockself' ) ) {
1132                                         return true;
1133                                         # User blocked themselves and is now trying to reverse it
1134                                 } elseif ( $performer->blockedBy() === $performer->getName() ) {
1135                                         return true;
1136                                 } else {
1137                                         return 'ipbnounblockself';
1138                                 }
1139                         } elseif (
1140                                 $target instanceof User &&
1141                                 $performer->getBlock() instanceof Block &&
1142                                 $performer->getBlock()->getBy() &&
1143                                 $performer->getBlock()->getBy() === $target->getId()
1144                         ) {
1145                                 // Allow users to block the user that blocked them.
1146                                 // This is to prevent a situation where a malicious user
1147                                 // blocks all other users. This way, the non-malicious
1148                                 // user can block the malicious user back, resulting
1149                                 // in a stalemate.
1150                                 return true;
1151
1152                         } else {
1153                                 # User is trying to block/unblock someone else
1154                                 return 'ipbblocked';
1155                         }
1156                 } else {
1157                         return true;
1158                 }
1159         }
1160
1161         /**
1162          * Return a comma-delimited list of "flags" to be passed to the log
1163          * reader for this block, to provide more information in the logs
1164          * @param array $data From HTMLForm data
1165          * @param int $type Block::TYPE_ constant (USER, RANGE, or IP)
1166          * @return string
1167          */
1168         protected static function blockLogFlags( array $data, $type ) {
1169                 $config = RequestContext::getMain()->getConfig();
1170
1171                 $blockAllowsUTEdit = $config->get( 'BlockAllowsUTEdit' );
1172
1173                 $flags = [];
1174
1175                 # when blocking a user the option 'anononly' is not available/has no effect
1176                 # -> do not write this into log
1177                 if ( !$data['HardBlock'] && $type != Block::TYPE_USER ) {
1178                         // For grepping: message block-log-flags-anononly
1179                         $flags[] = 'anononly';
1180                 }
1181
1182                 if ( $data['CreateAccount'] ) {
1183                         // For grepping: message block-log-flags-nocreate
1184                         $flags[] = 'nocreate';
1185                 }
1186
1187                 # Same as anononly, this is not displayed when blocking an IP address
1188                 if ( !$data['AutoBlock'] && $type == Block::TYPE_USER ) {
1189                         // For grepping: message block-log-flags-noautoblock
1190                         $flags[] = 'noautoblock';
1191                 }
1192
1193                 if ( $data['DisableEmail'] ) {
1194                         // For grepping: message block-log-flags-noemail
1195                         $flags[] = 'noemail';
1196                 }
1197
1198                 if ( $blockAllowsUTEdit && $data['DisableUTEdit'] ) {
1199                         // For grepping: message block-log-flags-nousertalk
1200                         $flags[] = 'nousertalk';
1201                 }
1202
1203                 if ( $data['HideUser'] ) {
1204                         // For grepping: message block-log-flags-hiddenname
1205                         $flags[] = 'hiddenname';
1206                 }
1207
1208                 return implode( ',', $flags );
1209         }
1210
1211         /**
1212          * Process the form on POST submission.
1213          * @param array $data
1214          * @param HTMLForm|null $form
1215          * @return bool|array True for success, false for didn't-try, array of errors on failure
1216          */
1217         public function onSubmit( array $data, HTMLForm $form = null ) {
1218                 // If "Editing" checkbox is unchecked, the block must be a partial block affecting
1219                 // actions other than editing, and there must be no restrictions.
1220                 if ( isset( $data['Editing'] ) && $data['Editing'] === false ) {
1221                         $data['EditingRestriction'] = 'partial';
1222                         $data['PageRestrictions'] = '';
1223                         $data['NamespaceRestrictions'] = '';
1224                 }
1225                 return self::processForm( $data, $form->getContext() );
1226         }
1227
1228         /**
1229          * Do something exciting on successful processing of the form, most likely to show a
1230          * confirmation message
1231          */
1232         public function onSuccess() {
1233                 $out = $this->getOutput();
1234                 $out->setPageTitle( $this->msg( 'blockipsuccesssub' ) );
1235                 $out->addWikiMsg( 'blockipsuccesstext', wfEscapeWikiText( $this->target ) );
1236         }
1237
1238         /**
1239          * Return an array of subpages beginning with $search that this special page will accept.
1240          *
1241          * @param string $search Prefix to search for
1242          * @param int $limit Maximum number of results to return (usually 10)
1243          * @param int $offset Number of results to skip (usually 0)
1244          * @return string[] Matching subpages
1245          */
1246         public function prefixSearchSubpages( $search, $limit, $offset ) {
1247                 $user = User::newFromName( $search );
1248                 if ( !$user ) {
1249                         // No prefix suggestion for invalid user
1250                         return [];
1251                 }
1252                 // Autocomplete subpage as user list - public to allow caching
1253                 return UserNamePrefixSearch::search( 'public', $search, $limit, $offset );
1254         }
1255
1256         protected function getGroupName() {
1257                 return 'users';
1258         }
1259 }