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\DatabaseBlock;
  25 use MediaWiki\Block\Restriction\PageRestriction;
  26 use MediaWiki\Block\Restriction\NamespaceRestriction;
  27 use MediaWiki\MediaWikiServices;
  28
  29 /**
  30  * A special page that allows users with 'block' right to block users from
  31  * editing pages and other actions
  32  *
  33  * @ingroup SpecialPage
  34  */
  35 class SpecialBlock extends FormSpecialPage {
  36         /** @var User|string|null User to be blocked, as passed either by parameter (url?wpTarget=Foo)
  37          * or as subpage (Special:Block/Foo) */
  38         protected $target;
  39
  40         /** @var int DatabaseBlock::TYPE_ constant */
  41         protected $type;
  42
  43         /** @var User|string The previous block target */
  44         protected $previousTarget;
  45
  46         /** @var bool Whether the previous submission of the form asked for HideUser */
  47         protected $requestedHideUser;
  48
  49         /** @var bool */
  50         protected $alreadyBlocked;
  51
  52         /** @var array */
  53         protected $preErrors = [];
  54
  55         public function __construct() {
  56                 parent::__construct( 'Block', 'block' );
  57         }
  58
  59         public function doesWrites() {
  60                 return true;
  61         }
  62
  63         /**
  64          * Checks that the user can unblock themselves if they are trying to do so
  65          *
  66          * @param User $user
  67          * @throws ErrorPageError
  68          */
  69         protected function checkExecutePermissions( User $user ) {
  70                 parent::checkExecutePermissions( $user );
  71                 # T17810: blocked admins should have limited access here
  72                 $status = self::checkUnblockSelf( $this->target, $user );
  73                 if ( $status !== true ) {
  74                         throw new ErrorPageError( 'badaccess', $status );
  75                 }
  76         }
  77
  78         /**
  79          * We allow certain special cases where user is blocked
  80          *
  81          * @return bool
  82          */
  83         public function requiresUnblock() {
  84                 return false;
  85         }
  86
  87         /**
  88          * Handle some magic here
  89          *
  90          * @param string $par
  91          */
  92         protected function setParameter( $par ) {
  93                 # Extract variables from the request.  Try not to get into a situation where we
  94                 # need to extract *every* variable from the form just for processing here, but
  95                 # there are legitimate uses for some variables
  96                 $request = $this->getRequest();
  97                 list( $this->target, $this->type ) = self::getTargetAndType( $par, $request );
  98                 if ( $this->target instanceof User ) {
  99                         # Set the 'relevant user' in the skin, so it displays links like Contributions,
 100                         # User logs, UserRights, etc.
 101                         $this->getSkin()->setRelevantUser( $this->target );
 102                 }
 103
 104                 list( $this->previousTarget, /*...*/ ) =
 105                         DatabaseBlock::parseTarget( $request->getVal( 'wpPreviousTarget' ) );
 106                 $this->requestedHideUser = $request->getBool( 'wpHideUser' );
 107         }
 108
 109         /**
 110          * Customizes the HTMLForm a bit
 111          *
 112          * @param HTMLForm $form
 113          */
 114         protected function alterForm( HTMLForm $form ) {
 115                 $form->setHeaderText( '' );
 116                 $form->setSubmitDestructive();
 117
 118                 $msg = $this->alreadyBlocked ? 'ipb-change-block' : 'ipbsubmit';
 119                 $form->setSubmitTextMsg( $msg );
 120
 121                 $this->addHelpLink( 'Help:Blocking users' );
 122
 123                 # Don't need to do anything if the form has been posted
 124                 if ( !$this->getRequest()->wasPosted() && $this->preErrors ) {
 125                         $s = $form->formatErrors( $this->preErrors );
 126                         if ( $s ) {
 127                                 $form->addHeaderText( Html::rawElement(
 128                                         'div',
 129                                         [ 'class' => 'error' ],
 130                                         $s
 131                                 ) );
 132                         }
 133                 }
 134         }
 135
 136         protected function getDisplayFormat() {
 137                 return 'ooui';
 138         }
 139
 140         /**
 141          * Get the HTMLForm descriptor array for the block form
 142          * @return array
 143          */
 144         protected function getFormFields() {
 145                 $conf = $this->getConfig();
 146                 $enablePartialBlocks = $conf->get( 'EnablePartialBlocks' );
 147                 $blockAllowsUTEdit = $conf->get( 'BlockAllowsUTEdit' );
 148
 149                 $this->getOutput()->enableOOUI();
 150
 151                 $user = $this->getUser();
 152
 153                 $suggestedDurations = self::getSuggestedDurations();
 154
 155                 $a = [];
 156
 157                 $a['Target'] = [
 158                         'type' => 'user',
 159                         'ipallowed' => true,
 160                         'iprange' => true,
 161                         'id' => 'mw-bi-target',
 162                         'size' => '45',
 163                         'autofocus' => true,
 164                         'required' => true,
 165                         'validation-callback' => [ __CLASS__, 'validateTargetField' ],
 166                         'section' => 'target',
 167                 ];
 168
 169                 $a['Editing'] = [
 170                         'type' => 'check',
 171                         'label-message' => 'block-prevent-edit',
 172                         'default' => true,
 173                         'section' => 'actions',
 174                         'disabled' => $enablePartialBlocks ? false : true,
 175                 ];
 176
 177                 if ( $enablePartialBlocks ) {
 178                         $a['EditingRestriction'] = [
 179                                 'type' => 'radio',
 180                                 'cssclass' => 'mw-block-editing-restriction',
 181                                 'options' => [
 182                                         $this->msg( 'ipb-sitewide' )->escaped() .
 183                                                 new \OOUI\LabelWidget( [
 184                                                         'classes' => [ 'oo-ui-inline-help' ],
 185                                                         'label' => $this->msg( 'ipb-sitewide-help' )->text(),
 186                                                 ] ) => 'sitewide',
 187                                         $this->msg( 'ipb-partial' )->escaped() .
 188                                                 new \OOUI\LabelWidget( [
 189                                                         'classes' => [ 'oo-ui-inline-help' ],
 190                                                         'label' => $this->msg( 'ipb-partial-help' )->text(),
 191                                                 ] ) => 'partial',
 192                                 ],
 193                                 'section' => 'actions',
 194                         ];
 195                         $a['PageRestrictions'] = [
 196                                 'type' => 'titlesmultiselect',
 197                                 'label' => $this->msg( 'ipb-pages-label' )->text(),
 198                                 'exists' => true,
 199                                 'max' => 10,
 200                                 'cssclass' => 'mw-block-restriction',
 201                                 'showMissing' => false,
 202                                 'excludeDynamicNamespaces' => true,
 203                                 'input' => [
 204                                         'autocomplete' => false
 205                                 ],
 206                                 'section' => 'actions',
 207                         ];
 208                         $a['NamespaceRestrictions'] = [
 209                                 'type' => 'namespacesmultiselect',
 210                                 'label' => $this->msg( 'ipb-namespaces-label' )->text(),
 211                                 'exists' => true,
 212                                 'cssclass' => 'mw-block-restriction',
 213                                 'input' => [
 214                                         'autocomplete' => false
 215                                 ],
 216                                 'section' => 'actions',
 217                         ];
 218                 }
 219
 220                 $a['CreateAccount'] = [
 221                         'type' => 'check',
 222                         'label-message' => 'ipbcreateaccount',
 223                         'default' => true,
 224                         'section' => 'actions',
 225                 ];
 226
 227                 if ( self::canBlockEmail( $user ) ) {
 228                         $a['DisableEmail'] = [
 229                                 'type' => 'check',
 230                                 'label-message' => 'ipbemailban',
 231                                 'section' => 'actions',
 232                         ];
 233                 }
 234
 235                 if ( $blockAllowsUTEdit ) {
 236                         $a['DisableUTEdit'] = [
 237                                 'type' => 'check',
 238                                 'label-message' => 'ipb-disableusertalk',
 239                                 'default' => false,
 240                                 'section' => 'actions',
 241                         ];
 242                 }
 243
 244                 $a['Expiry'] = [
 245                         'type' => 'expiry',
 246                         'required' => true,
 247                         'options' => $suggestedDurations,
 248                         'default' => $this->msg( 'ipb-default-expiry' )->inContentLanguage()->text(),
 249                         'section' => 'expiry',
 250                 ];
 251
 252                 $a['Reason'] = [
 253                         'type' => 'selectandother',
 254                         // HTML maxlength uses "UTF-16 code units", which means that characters outside BMP
 255                         // (e.g. emojis) count for two each. This limit is overridden in JS to instead count
 256                         // Unicode codepoints.
 257                         'maxlength' => CommentStore::COMMENT_CHARACTER_LIMIT,
 258                         'maxlength-unit' => 'codepoints',
 259                         'options-message' => 'ipbreason-dropdown',
 260                         'section' => 'reason',
 261                 ];
 262
 263                 $a['AutoBlock'] = [
 264                         'type' => 'check',
 265                         'label-message' => 'ipbenableautoblock',
 266                         'default' => true,
 267                         'section' => 'options',
 268                 ];
 269
 270                 # Allow some users to hide name from block log, blocklist and listusers
 271                 if ( $user->isAllowed( 'hideuser' ) ) {
 272                         $a['HideUser'] = [
 273                                 'type' => 'check',
 274                                 'label-message' => 'ipbhidename',
 275                                 'cssclass' => 'mw-block-hideuser',
 276                                 'section' => 'options',
 277                         ];
 278                 }
 279
 280                 # Watchlist their user page? (Only if user is logged in)
 281                 if ( $user->isLoggedIn() ) {
 282                         $a['Watch'] = [
 283                                 'type' => 'check',
 284                                 'label-message' => 'ipbwatchuser',
 285                                 'section' => 'options',
 286                         ];
 287                 }
 288
 289                 $a['HardBlock'] = [
 290                         'type' => 'check',
 291                         'label-message' => 'ipb-hardblock',
 292                         'default' => false,
 293                         'section' => 'options',
 294                 ];
 295
 296                 # This is basically a copy of the Target field, but the user can't change it, so we
 297                 # can see if the warnings we maybe showed to the user before still apply
 298                 $a['PreviousTarget'] = [
 299                         'type' => 'hidden',
 300                         'default' => false,
 301                 ];
 302
 303                 # We'll turn this into a checkbox if we need to
 304                 $a['Confirm'] = [
 305                         'type' => 'hidden',
 306                         'default' => '',
 307                         'label-message' => 'ipb-confirm',
 308                         'cssclass' => 'mw-block-confirm',
 309                 ];
 310
 311                 $this->maybeAlterFormDefaults( $a );
 312
 313                 // Allow extensions to add more fields
 314                 Hooks::run( 'SpecialBlockModifyFormFields', [ $this, &$a ] );
 315
 316                 return $a;
 317         }
 318
 319         /**
 320          * If the user has already been blocked with similar settings, load that block
 321          * and change the defaults for the form fields to match the existing settings.
 322          * @param array &$fields HTMLForm descriptor array
 323          */
 324         protected function maybeAlterFormDefaults( &$fields ) {
 325                 # This will be overwritten by request data
 326                 $fields['Target']['default'] = (string)$this->target;
 327
 328                 if ( $this->target ) {
 329                         $status = self::validateTarget( $this->target, $this->getUser() );
 330                         if ( !$status->isOK() ) {
 331                                 $errors = $status->getErrorsArray();
 332                                 $this->preErrors = array_merge( $this->preErrors, $errors );
 333                         }
 334                 }
 335
 336                 # This won't be
 337                 $fields['PreviousTarget']['default'] = (string)$this->target;
 338
 339                 $block = DatabaseBlock::newFromTarget( $this->target );
 340
 341                 // Populate fields if there is a block that is not an autoblock; if it is a range
 342                 // block, only populate the fields if the range is the same as $this->target
 343                 if ( $block instanceof DatabaseBlock && $block->getType() !== DatabaseBlock::TYPE_AUTO
 344                         && ( $this->type != DatabaseBlock::TYPE_RANGE
 345                                 || $block->getTarget() == $this->target )
 346                 ) {
 347                         $fields['HardBlock']['default'] = $block->isHardblock();
 348                         $fields['CreateAccount']['default'] = $block->isCreateAccountBlocked();
 349                         $fields['AutoBlock']['default'] = $block->isAutoblocking();
 350
 351                         if ( isset( $fields['DisableEmail'] ) ) {
 352                                 $fields['DisableEmail']['default'] = $block->isEmailBlocked();
 353                         }
 354
 355                         if ( isset( $fields['HideUser'] ) ) {
 356                                 $fields['HideUser']['default'] = $block->getHideName();
 357                         }
 358
 359                         if ( isset( $fields['DisableUTEdit'] ) ) {
 360                                 $fields['DisableUTEdit']['default'] = !$block->isUsertalkEditAllowed();
 361                         }
 362
 363                         // If the username was hidden (ipb_deleted == 1), don't show the reason
 364                         // unless this user also has rights to hideuser: T37839
 365                         if ( !$block->getHideName() || $this->getUser()->isAllowed( 'hideuser' ) ) {
 366                                 $fields['Reason']['default'] = $block->getReason();
 367                         } else {
 368                                 $fields['Reason']['default'] = '';
 369                         }
 370
 371                         if ( $this->getRequest()->wasPosted() ) {
 372                                 # Ok, so we got a POST submission asking us to reblock a user.  So show the
 373                                 # confirm checkbox; the user will only see it if they haven't previously
 374                                 $fields['Confirm']['type'] = 'check';
 375                         } else {
 376                                 # We got a target, but it wasn't a POST request, so the user must have gone
 377                                 # to a link like [[Special:Block/User]].  We don't need to show the checkbox
 378                                 # as long as they go ahead and block *that* user
 379                                 $fields['Confirm']['default'] = 1;
 380                         }
 381
 382                         if ( $block->getExpiry() == 'infinity' ) {
 383                                 $fields['Expiry']['default'] = 'infinite';
 384                         } else {
 385                                 $fields['Expiry']['default'] = wfTimestamp( TS_RFC2822, $block->getExpiry() );
 386                         }
 387
 388                         $this->alreadyBlocked = true;
 389                         $this->preErrors[] = [ 'ipb-needreblock', wfEscapeWikiText( (string)$block->getTarget() ) ];
 390                 }
 391
 392                 if ( $this->alreadyBlocked || $this->getRequest()->wasPosted()
 393                         || $this->getRequest()->getCheck( 'wpCreateAccount' )
 394                 ) {
 395                         $this->getOutput()->addJsConfigVars( 'wgCreateAccountDirty', true );
 396                 }
 397
 398                 # We always need confirmation to do HideUser
 399                 if ( $this->requestedHideUser ) {
 400                         $fields['Confirm']['type'] = 'check';
 401                         unset( $fields['Confirm']['default'] );
 402                         $this->preErrors[] = [ 'ipb-confirmhideuser', 'ipb-confirmaction' ];
 403                 }
 404
 405                 # Or if the user is trying to block themselves
 406                 if ( (string)$this->target === $this->getUser()->getName() ) {
 407                         $fields['Confirm']['type'] = 'check';
 408                         unset( $fields['Confirm']['default'] );
 409                         $this->preErrors[] = [ 'ipb-blockingself', 'ipb-confirmaction' ];
 410                 }
 411
 412                 if ( $this->getConfig()->get( 'EnablePartialBlocks' ) ) {
 413                         if ( $block instanceof DatabaseBlock && !$block->isSitewide() ) {
 414                                 $fields['EditingRestriction']['default'] = 'partial';
 415                         } else {
 416                                 $fields['EditingRestriction']['default'] = 'sitewide';
 417                         }
 418
 419                         if ( $block instanceof DatabaseBlock ) {
 420                                 $pageRestrictions = [];
 421                                 $namespaceRestrictions = [];
 422                                 foreach ( $block->getRestrictions() as $restriction ) {
 423                                         switch ( $restriction->getType() ) {
 424                                                 case PageRestriction::TYPE:
 425                                                         if ( $restriction->getTitle() ) {
 426                                                                 $pageRestrictions[] = $restriction->getTitle()->getPrefixedText();
 427                                                         }
 428                                                         break;
 429                                                 case NamespaceRestriction::TYPE:
 430                                                         $namespaceRestrictions[] = $restriction->getValue();
 431                                                         break;
 432                                         }
 433                                 }
 434
 435                                 if (
 436                                         !$block->isSitewide() &&
 437                                         empty( $pageRestrictions ) &&
 438                                         empty( $namespaceRestrictions )
 439                                 ) {
 440                                         $fields['Editing']['default'] = false;
 441                                 }
 442
 443                                 // Sort the restrictions so they are in alphabetical order.
 444                                 sort( $pageRestrictions );
 445                                 $fields['PageRestrictions']['default'] = implode( "\n", $pageRestrictions );
 446                                 sort( $namespaceRestrictions );
 447                                 $fields['NamespaceRestrictions']['default'] = implode( "\n", $namespaceRestrictions );
 448                         }
 449                 }
 450         }
 451
 452         /**
 453          * Add header elements like block log entries, etc.
 454          * @return string
 455          */
 456         protected function preText() {
 457                 $this->getOutput()->addModuleStyles( [
 458                         'mediawiki.widgets.TagMultiselectWidget.styles',
 459                         'mediawiki.special',
 460                 ] );
 461                 $this->getOutput()->addModules( [ 'mediawiki.special.block' ] );
 462
 463                 $blockCIDRLimit = $this->getConfig()->get( 'BlockCIDRLimit' );
 464                 $text = $this->msg( 'blockiptext', $blockCIDRLimit['IPv4'], $blockCIDRLimit['IPv6'] )->parse();
 465
 466                 $otherBlockMessages = [];
 467                 if ( $this->target !== null ) {
 468                         $targetName = $this->target;
 469                         if ( $this->target instanceof User ) {
 470                                 $targetName = $this->target->getName();
 471                         }
 472                         # Get other blocks, i.e. from GlobalBlocking or TorBlock extension
 473                         Hooks::run( 'OtherBlockLogLink', [ &$otherBlockMessages, $targetName ] );
 474
 475                         if ( count( $otherBlockMessages ) ) {
 476                                 $s = Html::rawElement(
 477                                         'h2',
 478                                         [],
 479                                         $this->msg( 'ipb-otherblocks-header', count( $otherBlockMessages ) )->parse()
 480                                 ) . "\n";
 481
 482                                 $list = '';
 483
 484                                 foreach ( $otherBlockMessages as $link ) {
 485                                         $list .= Html::rawElement( 'li', [], $link ) . "\n";
 486                                 }
 487
 488                                 $s .= Html::rawElement(
 489                                         'ul',
 490                                         [ 'class' => 'mw-blockip-alreadyblocked' ],
 491                                         $list
 492                                 ) . "\n";
 493
 494                                 $text .= $s;
 495                         }
 496                 }
 497
 498                 return $text;
 499         }
 500
 501         /**
 502          * Add footer elements to the form
 503          * @return string
 504          */
 505         protected function postText() {
 506                 $links = [];
 507
 508                 $this->getOutput()->addModuleStyles( 'mediawiki.special' );
 509
 510                 $linkRenderer = $this->getLinkRenderer();
 511                 # Link to the user's contributions, if applicable
 512                 if ( $this->target instanceof User ) {
 513                         $contribsPage = SpecialPage::getTitleFor( 'Contributions', $this->target->getName() );
 514                         $links[] = $linkRenderer->makeLink(
 515                                 $contribsPage,
 516                                 $this->msg( 'ipb-blocklist-contribs', $this->target->getName() )->text()
 517                         );
 518                 }
 519
 520                 # Link to unblock the specified user, or to a blank unblock form
 521                 if ( $this->target instanceof User ) {
 522                         $message = $this->msg(
 523                                 'ipb-unblock-addr',
 524                                 wfEscapeWikiText( $this->target->getName() )
 525                         )->parse();
 526                         $list = SpecialPage::getTitleFor( 'Unblock', $this->target->getName() );
 527                 } else {
 528                         $message = $this->msg( 'ipb-unblock' )->parse();
 529                         $list = SpecialPage::getTitleFor( 'Unblock' );
 530                 }
 531                 $links[] = $linkRenderer->makeKnownLink(
 532                         $list,
 533                         new HtmlArmor( $message )
 534                 );
 535
 536                 # Link to the block list
 537                 $links[] = $linkRenderer->makeKnownLink(
 538                         SpecialPage::getTitleFor( 'BlockList' ),
 539                         $this->msg( 'ipb-blocklist' )->text()
 540                 );
 541
 542                 $user = $this->getUser();
 543
 544                 # Link to edit the block dropdown reasons, if applicable
 545                 if ( $user->isAllowed( 'editinterface' ) ) {
 546                         $links[] = $linkRenderer->makeKnownLink(
 547                                 $this->msg( 'ipbreason-dropdown' )->inContentLanguage()->getTitle(),
 548                                 $this->msg( 'ipb-edit-dropdown' )->text(),
 549                                 [],
 550                                 [ 'action' => 'edit' ]
 551                         );
 552                 }
 553
 554                 $text = Html::rawElement(
 555                         'p',
 556                         [ 'class' => 'mw-ipb-conveniencelinks' ],
 557                         $this->getLanguage()->pipeList( $links )
 558                 );
 559
 560                 $userTitle = self::getTargetUserTitle( $this->target );
 561                 if ( $userTitle ) {
 562                         # Get relevant extracts from the block and suppression logs, if possible
 563                         $out = '';
 564
 565                         LogEventsList::showLogExtract(
 566                                 $out,
 567                                 'block',
 568                                 $userTitle,
 569                                 '',
 570                                 [
 571                                         'lim' => 10,
 572                                         'msgKey' => [ 'blocklog-showlog', $userTitle->getText() ],
 573                                         'showIfEmpty' => false
 574                                 ]
 575                         );
 576                         $text .= $out;
 577
 578                         # Add suppression block entries if allowed
 579                         if ( $user->isAllowed( 'suppressionlog' ) ) {
 580                                 LogEventsList::showLogExtract(
 581                                         $out,
 582                                         'suppress',
 583                                         $userTitle,
 584                                         '',
 585                                         [
 586                                                 'lim' => 10,
 587                                                 'conds' => [ 'log_action' => [ 'block', 'reblock', 'unblock' ] ],
 588                                                 'msgKey' => [ 'blocklog-showsuppresslog', $userTitle->getText() ],
 589                                                 'showIfEmpty' => false
 590                                         ]
 591                                 );
 592
 593                                 $text .= $out;
 594                         }
 595                 }
 596
 597                 return $text;
 598         }
 599
 600         /**
 601          * Get a user page target for things like logs.
 602          * This handles account and IP range targets.
 603          * @param User|string $target
 604          * @return Title|null
 605          */
 606         protected static function getTargetUserTitle( $target ) {
 607                 if ( $target instanceof User ) {
 608                         return $target->getUserPage();
 609                 } elseif ( IP::isIPAddress( $target ) ) {
 610                         return Title::makeTitleSafe( NS_USER, $target );
 611                 }
 612
 613                 return null;
 614         }
 615
 616         /**
 617          * Determine the target of the block, and the type of target
 618          * @todo Should be in DatabaseBlock.php?
 619          * @param string $par Subpage parameter passed to setup, or data value from
 620          *     the HTMLForm
 621          * @param WebRequest|null $request Optionally try and get data from a request too
 622          * @return array [ User|string|null, DatabaseBlock::TYPE_ constant|null ]
 623          * @phan-return array{0:User|string|null,1:int|null}
 624          */
 625         public static function getTargetAndType( $par, WebRequest $request = null ) {
 626                 $i = 0;
 627                 $target = null;
 628
 629                 while ( true ) {
 630                         switch ( $i++ ) {
 631                                 case 0:
 632                                         # The HTMLForm will check wpTarget first and only if it doesn't get
 633                                         # a value use the default, which will be generated from the options
 634                                         # below; so this has to have a higher precedence here than $par, or
 635                                         # we could end up with different values in $this->target and the HTMLForm!
 636                                         if ( $request instanceof WebRequest ) {
 637                                                 $target = $request->getText( 'wpTarget', null );
 638                                         }
 639                                         break;
 640                                 case 1:
 641                                         $target = $par;
 642                                         break;
 643                                 case 2:
 644                                         if ( $request instanceof WebRequest ) {
 645                                                 $target = $request->getText( 'ip', null );
 646                                         }
 647                                         break;
 648                                 case 3:
 649                                         # B/C @since 1.18
 650                                         if ( $request instanceof WebRequest ) {
 651                                                 $target = $request->getText( 'wpBlockAddress', null );
 652                                         }
 653                                         break;
 654                                 case 4:
 655                                         break 2;
 656                         }
 657
 658                         list( $target, $type ) = DatabaseBlock::parseTarget( $target );
 659
 660                         if ( $type !== null ) {
 661                                 return [ $target, $type ];
 662                         }
 663                 }
 664
 665                 return [ null, null ];
 666         }
 667
 668         /**
 669          * HTMLForm field validation-callback for Target field.
 670          * @since 1.18
 671          * @param string $value
 672          * @param array $alldata
 673          * @param HTMLForm $form
 674          * @return Message
 675          */
 676         public static function validateTargetField( $value, $alldata, $form ) {
 677                 $status = self::validateTarget( $value, $form->getUser() );
 678                 if ( !$status->isOK() ) {
 679                         $errors = $status->getErrorsArray();
 680
 681                         return $form->msg( ...$errors[0] );
 682                 } else {
 683                         return true;
 684                 }
 685         }
 686
 687         /**
 688          * Validate a block target.
 689          *
 690          * @since 1.21
 691          * @param string $value Block target to check
 692          * @param User $user Performer of the block
 693          * @return Status
 694          */
 695         public static function validateTarget( $value, User $user ) {
 696                 global $wgBlockCIDRLimit;
 697
 698                 /** @var User $target */
 699                 list( $target, $type ) = self::getTargetAndType( $value );
 700                 $status = Status::newGood( $target );
 701
 702                 if ( $type == DatabaseBlock::TYPE_USER ) {
 703                         if ( $target->isAnon() ) {
 704                                 $status->fatal(
 705                                         'nosuchusershort',
 706                                         wfEscapeWikiText( $target->getName() )
 707                                 );
 708                         }
 709
 710                         $unblockStatus = self::checkUnblockSelf( $target, $user );
 711                         if ( $unblockStatus !== true ) {
 712                                 $status->fatal( 'badaccess', $unblockStatus );
 713                         }
 714                 } elseif ( $type == DatabaseBlock::TYPE_RANGE ) {
 715                         list( $ip, $range ) = explode( '/', $target, 2 );
 716
 717                         if (
 718                                 ( IP::isIPv4( $ip ) && $wgBlockCIDRLimit['IPv4'] == 32 ) ||
 719                                 ( IP::isIPv6( $ip ) && $wgBlockCIDRLimit['IPv6'] == 128 )
 720                         ) {
 721                                 // Range block effectively disabled
 722                                 $status->fatal( 'range_block_disabled' );
 723                         }
 724
 725                         if (
 726                                 ( IP::isIPv4( $ip ) && $range > 32 ) ||
 727                                 ( IP::isIPv6( $ip ) && $range > 128 )
 728                         ) {
 729                                 // Dodgy range
 730                                 $status->fatal( 'ip_range_invalid' );
 731                         }
 732
 733                         if ( IP::isIPv4( $ip ) && $range < $wgBlockCIDRLimit['IPv4'] ) {
 734                                 $status->fatal( 'ip_range_toolarge', $wgBlockCIDRLimit['IPv4'] );
 735                         }
 736
 737                         if ( IP::isIPv6( $ip ) && $range < $wgBlockCIDRLimit['IPv6'] ) {
 738                                 $status->fatal( 'ip_range_toolarge', $wgBlockCIDRLimit['IPv6'] );
 739                         }
 740                 } elseif ( $type == DatabaseBlock::TYPE_IP ) {
 741                         # All is well
 742                 } else {
 743                         $status->fatal( 'badipaddress' );
 744                 }
 745
 746                 return $status;
 747         }
 748
 749         /**
 750          * Given the form data, actually implement a block. This is also called from ApiBlock.
 751          *
 752          * @param array $data
 753          * @param IContextSource $context
 754          * @return bool|string
 755          */
 756         public static function processForm( array $data, IContextSource $context ) {
 757                 global $wgBlockAllowsUTEdit, $wgHideUserContribLimit;
 758
 759                 $performer = $context->getUser();
 760                 $enablePartialBlocks = $context->getConfig()->get( 'EnablePartialBlocks' );
 761                 $isPartialBlock = $enablePartialBlocks &&
 762                         isset( $data['EditingRestriction'] ) &&
 763                         $data['EditingRestriction'] === 'partial';
 764
 765                 // Handled by field validator callback
 766                 // self::validateTargetField( $data['Target'] );
 767
 768                 # This might have been a hidden field or a checkbox, so interesting data
 769                 # can come from it
 770                 $data['Confirm'] = !in_array( $data['Confirm'], [ '', '0', null, false ], true );
 771
 772                 /** @var User $target */
 773                 list( $target, $type ) = self::getTargetAndType( $data['Target'] );
 774                 if ( $type == DatabaseBlock::TYPE_USER ) {
 775                         $user = $target;
 776                         $target = $user->getName();
 777                         $userId = $user->getId();
 778
 779                         # Give admins a heads-up before they go and block themselves.  Much messier
 780                         # to do this for IPs, but it's pretty unlikely they'd ever get the 'block'
 781                         # permission anyway, although the code does allow for it.
 782                         # Note: Important to use $target instead of $data['Target']
 783                         # since both $data['PreviousTarget'] and $target are normalized
 784                         # but $data['target'] gets overridden by (non-normalized) request variable
 785                         # from previous request.
 786                         if ( $target === $performer->getName() &&
 787                                 ( $data['PreviousTarget'] !== $target || !$data['Confirm'] )
 788                         ) {
 789                                 return [ 'ipb-blockingself', 'ipb-confirmaction' ];
 790                         }
 791                 } elseif ( $type == DatabaseBlock::TYPE_RANGE ) {
 792                         $user = null;
 793                         $userId = 0;
 794                 } elseif ( $type == DatabaseBlock::TYPE_IP ) {
 795                         $user = null;
 796                         $target = $target->getName();
 797                         $userId = 0;
 798                 } else {
 799                         # This should have been caught in the form field validation
 800                         return [ 'badipaddress' ];
 801                 }
 802
 803                 $expiryTime = self::parseExpiryInput( $data['Expiry'] );
 804
 805                 if (
 806                         // an expiry time is needed
 807                         ( strlen( $data['Expiry'] ) == 0 ) ||
 808                         // can't be a larger string as 50 (it should be a time format in any way)
 809                         ( strlen( $data['Expiry'] ) > 50 ) ||
 810                         // check, if the time could be parsed
 811                         !$expiryTime
 812                 ) {
 813                         return [ 'ipb_expiry_invalid' ];
 814                 }
 815
 816                 // an expiry time should be in the future, not in the
 817                 // past (wouldn't make any sense) - bug T123069
 818                 if ( $expiryTime < wfTimestampNow() ) {
 819                         return [ 'ipb_expiry_old' ];
 820                 }
 821
 822                 if ( !isset( $data['DisableEmail'] ) ) {
 823                         $data['DisableEmail'] = false;
 824                 }
 825
 826                 # If the user has done the form 'properly', they won't even have been given the
 827                 # option to suppress-block unless they have the 'hideuser' permission
 828                 if ( !isset( $data['HideUser'] ) ) {
 829                         $data['HideUser'] = false;
 830                 }
 831
 832                 if ( $data['HideUser'] ) {
 833                         if ( !$performer->isAllowed( 'hideuser' ) ) {
 834                                 # this codepath is unreachable except by a malicious user spoofing forms,
 835                                 # or by race conditions (user has hideuser and block rights, loads block form,
 836                                 # and loses hideuser rights before submission); so need to fail completely
 837                                 # rather than just silently disable hiding
 838                                 return [ 'badaccess-group0' ];
 839                         }
 840
 841                         if ( $isPartialBlock ) {
 842                                 return [ 'ipb_hide_partial' ];
 843                         }
 844
 845                         # Recheck params here...
 846                         if ( $type != DatabaseBlock::TYPE_USER ) {
 847                                 $data['HideUser'] = false; # IP users should not be hidden
 848                         } elseif ( !wfIsInfinity( $data['Expiry'] ) ) {
 849                                 # Bad expiry.
 850                                 return [ 'ipb_expiry_temp' ];
 851                         } elseif ( $wgHideUserContribLimit !== false
 852                                 && $user->getEditCount() > $wgHideUserContribLimit
 853                         ) {
 854                                 # Typically, the user should have a handful of edits.
 855                                 # Disallow hiding users with many edits for performance.
 856                                 return [ [ 'ipb_hide_invalid',
 857                                         Message::numParam( $wgHideUserContribLimit ) ] ];
 858                         } elseif ( !$data['Confirm'] ) {
 859                                 return [ 'ipb-confirmhideuser', 'ipb-confirmaction' ];
 860                         }
 861                 }
 862
 863                 # Create block object.
 864                 $block = new DatabaseBlock();
 865                 $block->setTarget( $target );
 866                 $block->setBlocker( $performer );
 867                 $block->setReason( $data['Reason'][0] );
 868                 $block->setExpiry( $expiryTime );
 869                 $block->isCreateAccountBlocked( $data['CreateAccount'] );
 870                 $block->isUsertalkEditAllowed( !$wgBlockAllowsUTEdit || !$data['DisableUTEdit'] );
 871                 $block->isEmailBlocked( $data['DisableEmail'] );
 872                 $block->isHardblock( $data['HardBlock'] );
 873                 $block->isAutoblocking( $data['AutoBlock'] );
 874                 $block->setHideName( $data['HideUser'] );
 875
 876                 if ( $isPartialBlock ) {
 877                         $block->isSitewide( false );
 878                 }
 879
 880                 $reason = [ 'hookaborted' ];
 881                 if ( !Hooks::run( 'BlockIp', [ &$block, &$performer, &$reason ] ) ) {
 882                         return $reason;
 883                 }
 884
 885                 $pageRestrictions = [];
 886                 $namespaceRestrictions = [];
 887                 if ( $enablePartialBlocks ) {
 888                         if ( $data['PageRestrictions'] !== '' ) {
 889                                 $pageRestrictions = array_map( function ( $text ) {
 890                                         $title = Title::newFromText( $text );
 891                                         // Use the link cache since the title has already been loaded when
 892                                         // the field was validated.
 893                                         $restriction = new PageRestriction( 0, $title->getArticleID() );
 894                                         $restriction->setTitle( $title );
 895                                         return $restriction;
 896                                 }, explode( "\n", $data['PageRestrictions'] ) );
 897                         }
 898                         if ( $data['NamespaceRestrictions'] !== '' ) {
 899                                 $namespaceRestrictions = array_map( function ( $id ) {
 900                                         return new NamespaceRestriction( 0, $id );
 901                                 }, explode( "\n", $data['NamespaceRestrictions'] ) );
 902                         }
 903
 904                         $restrictions = ( array_merge( $pageRestrictions, $namespaceRestrictions ) );
 905                         $block->setRestrictions( $restrictions );
 906                 }
 907
 908                 $priorBlock = null;
 909                 # Try to insert block. Is there a conflicting block?
 910                 $status = $block->insert();
 911                 if ( !$status ) {
 912                         # Indicates whether the user is confirming the block and is aware of
 913                         # the conflict (did not change the block target in the meantime)
 914                         $blockNotConfirmed = !$data['Confirm'] || ( array_key_exists( 'PreviousTarget', $data )
 915                                 && $data['PreviousTarget'] !== $target );
 916
 917                         # Special case for API - T34434
 918                         $reblockNotAllowed = ( array_key_exists( 'Reblock', $data ) && !$data['Reblock'] );
 919
 920                         # Show form unless the user is already aware of this...
 921                         if ( $blockNotConfirmed || $reblockNotAllowed ) {
 922                                 return [ [ 'ipb_already_blocked', $block->getTarget() ] ];
 923                                 # Otherwise, try to update the block...
 924                         } else {
 925                                 # This returns direct blocks before autoblocks/rangeblocks, since we should
 926                                 # be sure the user is blocked by now it should work for our purposes
 927                                 $currentBlock = DatabaseBlock::newFromTarget( $target );
 928                                 if ( $block->equals( $currentBlock ) ) {
 929                                         return [ [ 'ipb_already_blocked', $block->getTarget() ] ];
 930                                 }
 931                                 # If the name was hidden and the blocking user cannot hide
 932                                 # names, then don't allow any block changes...
 933                                 if ( $currentBlock->getHideName() && !$performer->isAllowed( 'hideuser' ) ) {
 934                                         return [ 'cant-see-hidden-user' ];
 935                                 }
 936
 937                                 $priorBlock = clone $currentBlock;
 938                                 $currentBlock->isHardblock( $block->isHardblock() );
 939                                 $currentBlock->isCreateAccountBlocked( $block->isCreateAccountBlocked() );
 940                                 $currentBlock->setExpiry( $block->getExpiry() );
 941                                 $currentBlock->isAutoblocking( $block->isAutoblocking() );
 942                                 $currentBlock->setHideName( $block->getHideName() );
 943                                 $currentBlock->isEmailBlocked( $block->isEmailBlocked() );
 944                                 $currentBlock->isUsertalkEditAllowed( $block->isUsertalkEditAllowed() );
 945                                 $currentBlock->setReason( $block->getReason() );
 946
 947                                 if ( $enablePartialBlocks ) {
 948                                         // Maintain the sitewide status. If partial blocks is not enabled,
 949                                         // saving the block will result in a sitewide block.
 950                                         $currentBlock->isSitewide( $block->isSitewide() );
 951
 952                                         // Set the block id of the restrictions.
 953                                         $blockRestrictionStore = MediaWikiServices::getInstance()->getBlockRestrictionStore();
 954                                         $currentBlock->setRestrictions(
 955                                                 $blockRestrictionStore->setBlockId( $currentBlock->getId(), $restrictions )
 956                                         );
 957                                 }
 958
 959                                 $status = $currentBlock->update();
 960                                 // TODO handle failure
 961
 962                                 $logaction = 'reblock';
 963
 964                                 # Unset _deleted fields if requested
 965                                 if ( $currentBlock->getHideName() && !$data['HideUser'] ) {
 966                                         RevisionDeleteUser::unsuppressUserName( $target, $userId );
 967                                 }
 968
 969                                 # If hiding/unhiding a name, this should go in the private logs
 970                                 if ( (bool)$currentBlock->getHideName() ) {
 971                                         $data['HideUser'] = true;
 972                                 }
 973
 974                                 $block = $currentBlock;
 975                         }
 976                 } else {
 977                         $logaction = 'block';
 978                 }
 979
 980                 Hooks::run( 'BlockIpComplete', [ $block, $performer, $priorBlock ] );
 981
 982                 # Set *_deleted fields if requested
 983                 if ( $data['HideUser'] ) {
 984                         RevisionDeleteUser::suppressUserName( $target, $userId );
 985                 }
 986
 987                 # Can't watch a rangeblock
 988                 if ( $type != DatabaseBlock::TYPE_RANGE && $data['Watch'] ) {
 989                         WatchAction::doWatch(
 990                                 Title::makeTitle( NS_USER, $target ),
 991                                 $performer,
 992                                 User::IGNORE_USER_RIGHTS
 993                         );
 994                 }
 995
 996                 # DatabaseBlock constructor sanitizes certain block options on insert
 997                 $data['BlockEmail'] = $block->isEmailBlocked();
 998                 $data['AutoBlock'] = $block->isAutoblocking();
 999
1000                 # Prepare log parameters
1001                 $logParams = [];
1002                 $logParams['5::duration'] = $data['Expiry'];
1003                 $logParams['6::flags'] = self::blockLogFlags( $data, $type );
1004                 $logParams['sitewide'] = $block->isSitewide();
1005
1006                 if ( $enablePartialBlocks && !$block->isSitewide() ) {
1007                         if ( $data['PageRestrictions'] !== '' ) {
1008                                 $logParams['7::restrictions']['pages'] = explode( "\n", $data['PageRestrictions'] );
1009                         }
1010
1011                         if ( $data['NamespaceRestrictions'] !== '' ) {
1012                                 $logParams['7::restrictions']['namespaces'] = explode( "\n", $data['NamespaceRestrictions'] );
1013                         }
1014                 }
1015
1016                 # Make log entry, if the name is hidden, put it in the suppression log
1017                 $log_type = $data['HideUser'] ? 'suppress' : 'block';
1018                 $logEntry = new ManualLogEntry( $log_type, $logaction );
1019                 $logEntry->setTarget( Title::makeTitle( NS_USER, $target ) );
1020                 $logEntry->setComment( $data['Reason'][0] );
1021                 $logEntry->setPerformer( $performer );
1022                 $logEntry->setParameters( $logParams );
1023                 # Relate log ID to block ID (T27763)
1024                 $logEntry->setRelations( [ 'ipb_id' => $block->getId() ] );
1025                 $logId = $logEntry->insert();
1026
1027                 if ( !empty( $data['Tags'] ) ) {
1028                         $logEntry->setTags( $data['Tags'] );
1029                 }
1030
1031                 $logEntry->publish( $logId );
1032
1033                 return true;
1034         }
1035
1036         /**
1037          * Get an array of suggested block durations from MediaWiki:Ipboptions
1038          * @todo FIXME: This uses a rather odd syntax for the options, should it be converted
1039          *     to the standard "**<duration>|<displayname>" format?
1040          * @param Language|null $lang The language to get the durations in, or null to use
1041          *     the wiki's content language
1042          * @param bool $includeOther Whether to include the 'other' option in the list of
1043          *     suggestions
1044          * @return array
1045          */
1046         public static function getSuggestedDurations( Language $lang = null, $includeOther = true ) {
1047                 $a = [];
1048                 $msg = $lang === null
1049                         ? wfMessage( 'ipboptions' )->inContentLanguage()->text()
1050                         : wfMessage( 'ipboptions' )->inLanguage( $lang )->text();
1051
1052                 if ( $msg == '-' ) {
1053                         return [];
1054                 }
1055
1056                 foreach ( explode( ',', $msg ) as $option ) {
1057                         if ( strpos( $option, ':' ) === false ) {
1058                                 $option = "$option:$option";
1059                         }
1060
1061                         list( $show, $value ) = explode( ':', $option );
1062                         $a[$show] = $value;
1063                 }
1064
1065                 if ( $a && $includeOther ) {
1066                         // if options exist, add other to the end instead of the begining (which
1067                         // is what happens by default).
1068                         $a[ wfMessage( 'ipbother' )->text() ] = 'other';
1069                 }
1070
1071                 return $a;
1072         }
1073
1074         /**
1075          * Convert a submitted expiry time, which may be relative ("2 weeks", etc) or absolute
1076          * ("24 May 2034", etc), into an absolute timestamp we can put into the database.
1077          *
1078          * @todo strtotime() only accepts English strings. This means the expiry input
1079          *       can only be specified in English.
1080          * @see https://www.php.net/manual/en/function.strtotime.php
1081          *
1082          * @param string $expiry Whatever was typed into the form
1083          * @return string|bool Timestamp or 'infinity' or false on error.
1084          */
1085         public static function parseExpiryInput( $expiry ) {
1086                 if ( wfIsInfinity( $expiry ) ) {
1087                         return 'infinity';
1088                 }
1089
1090                 $expiry = strtotime( $expiry );
1091
1092                 if ( $expiry < 0 || $expiry === false ) {
1093                         return false;
1094                 }
1095
1096                 return wfTimestamp( TS_MW, $expiry );
1097         }
1098
1099         /**
1100          * Can we do an email block?
1101          * @param User $user The sysop wanting to make a block
1102          * @return bool
1103          */
1104         public static function canBlockEmail( $user ) {
1105                 global $wgEnableUserEmail, $wgSysopEmailBans;
1106
1107                 return ( $wgEnableUserEmail && $wgSysopEmailBans && $user->isAllowed( 'blockemail' ) );
1108         }
1109
1110         /**
1111          * T17810: blocked admins should not be able to block/unblock
1112          * others, and probably shouldn't be able to unblock themselves
1113          * either.
1114          *
1115          * Exception: Users can block the user who blocked them, to reduce
1116          * advantage of a malicious account blocking all admins (T150826)
1117          *
1118          * @param User|int|string|null $target Target to block or unblock; could be a User object,
1119          *   or a user ID or username, or null when the target is not known yet (e.g. when
1120          *   displaying Special:Block)
1121          * @param User $performer User doing the request
1122          * @return bool|string True or error message key
1123          */
1124         public static function checkUnblockSelf( $target, User $performer ) {
1125                 if ( is_int( $target ) ) {
1126                         $target = User::newFromId( $target );
1127                 } elseif ( is_string( $target ) ) {
1128                         $target = User::newFromName( $target );
1129                 }
1130                 if ( $performer->getBlock() ) {
1131                         if ( $target instanceof User && $target->getId() == $performer->getId() ) {
1132                                 # User is trying to unblock themselves
1133                                 // @TODO Ensure that the block does not apply to the `unblockself`
1134                                 //       right.
1135                                 if ( $performer->isAllowed( 'unblockself' ) ) {
1136                                         return true;
1137                                         # User blocked themselves and is now trying to reverse it
1138                                 } elseif ( $performer->blockedBy() === $performer->getName() ) {
1139                                         return true;
1140                                 } else {
1141                                         return 'ipbnounblockself';
1142                                 }
1143                         } elseif (
1144                                 $target instanceof User &&
1145                                 $performer->getBlock() instanceof DatabaseBlock &&
1146                                 $performer->getBlock()->getBy() &&
1147                                 $performer->getBlock()->getBy() === $target->getId()
1148                         ) {
1149                                 // Allow users to block the user that blocked them.
1150                                 // This is to prevent a situation where a malicious user
1151                                 // blocks all other users. This way, the non-malicious
1152                                 // user can block the malicious user back, resulting
1153                                 // in a stalemate.
1154                                 return true;
1155
1156                         } else {
1157                                 # User is trying to block/unblock someone else
1158                                 return 'ipbblocked';
1159                         }
1160                 } else {
1161                         return true;
1162                 }
1163         }
1164
1165         /**
1166          * Return a comma-delimited list of "flags" to be passed to the log
1167          * reader for this block, to provide more information in the logs
1168          * @param array $data From HTMLForm data
1169          * @param int $type DatabaseBlock::TYPE_ constant (USER, RANGE, or IP)
1170          * @return string
1171          */
1172         protected static function blockLogFlags( array $data, $type ) {
1173                 $config = RequestContext::getMain()->getConfig();
1174
1175                 $blockAllowsUTEdit = $config->get( 'BlockAllowsUTEdit' );
1176
1177                 $flags = [];
1178
1179                 # when blocking a user the option 'anononly' is not available/has no effect
1180                 # -> do not write this into log
1181                 if ( !$data['HardBlock'] && $type != DatabaseBlock::TYPE_USER ) {
1182                         // For grepping: message block-log-flags-anononly
1183                         $flags[] = 'anononly';
1184                 }
1185
1186                 if ( $data['CreateAccount'] ) {
1187                         // For grepping: message block-log-flags-nocreate
1188                         $flags[] = 'nocreate';
1189                 }
1190
1191                 # Same as anononly, this is not displayed when blocking an IP address
1192                 if ( !$data['AutoBlock'] && $type == DatabaseBlock::TYPE_USER ) {
1193                         // For grepping: message block-log-flags-noautoblock
1194                         $flags[] = 'noautoblock';
1195                 }
1196
1197                 if ( $data['DisableEmail'] ) {
1198                         // For grepping: message block-log-flags-noemail
1199                         $flags[] = 'noemail';
1200                 }
1201
1202                 if ( $blockAllowsUTEdit && $data['DisableUTEdit'] ) {
1203                         // For grepping: message block-log-flags-nousertalk
1204                         $flags[] = 'nousertalk';
1205                 }
1206
1207                 if ( $data['HideUser'] ) {
1208                         // For grepping: message block-log-flags-hiddenname
1209                         $flags[] = 'hiddenname';
1210                 }
1211
1212                 return implode( ',', $flags );
1213         }
1214
1215         /**
1216          * Process the form on POST submission.
1217          * @param array $data
1218          * @param HTMLForm|null $form
1219          * @return bool|array True for success, false for didn't-try, array of errors on failure
1220          */
1221         public function onSubmit( array $data, HTMLForm $form = null ) {
1222                 // If "Editing" checkbox is unchecked, the block must be a partial block affecting
1223                 // actions other than editing, and there must be no restrictions.
1224                 if ( isset( $data['Editing'] ) && $data['Editing'] === false ) {
1225                         $data['EditingRestriction'] = 'partial';
1226                         $data['PageRestrictions'] = '';
1227                         $data['NamespaceRestrictions'] = '';
1228                 }
1229                 return self::processForm( $data, $form->getContext() );
1230         }
1231
1232         /**
1233          * Do something exciting on successful processing of the form, most likely to show a
1234          * confirmation message
1235          */
1236         public function onSuccess() {
1237                 $out = $this->getOutput();
1238                 $out->setPageTitle( $this->msg( 'blockipsuccesssub' ) );
1239                 $out->addWikiMsg( 'blockipsuccesstext', wfEscapeWikiText( $this->target ) );
1240         }
1241
1242         /**
1243          * Return an array of subpages beginning with $search that this special page will accept.
1244          *
1245          * @param string $search Prefix to search for
1246          * @param int $limit Maximum number of results to return (usually 10)
1247          * @param int $offset Number of results to skip (usually 0)
1248          * @return string[] Matching subpages
1249          */
1250         public function prefixSearchSubpages( $search, $limit, $offset ) {
1251                 $user = User::newFromName( $search );
1252                 if ( !$user ) {
1253                         // No prefix suggestion for invalid user
1254                         return [];
1255                 }
1256                 // Autocomplete subpage as user list - public to allow caching
1257                 return UserNamePrefixSearch::search( 'public', $search, $limit, $offset );
1258         }
1259
1260         protected function getGroupName() {
1261                 return 'users';
1262         }
1263 }