includes/Block.php

   1 <?php
   2 /**
   3  * Blocks and bans object
   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  */
  22
  23 use Wikimedia\Rdbms\Database;
  24 use Wikimedia\Rdbms\IDatabase;
  25 use MediaWiki\MediaWikiServices;
  26
  27 class Block {
  28         /** @var string */
  29         public $mReason;
  30
  31         /** @var string */
  32         public $mTimestamp;
  33
  34         /** @var bool */
  35         public $mAuto;
  36
  37         /** @var string */
  38         public $mExpiry;
  39
  40         /** @var bool */
  41         public $mHideName;
  42
  43         /** @var int */
  44         public $mParentBlockId;
  45
  46         /** @var int */
  47         private $mId;
  48
  49         /** @var bool */
  50         private $mFromMaster;
  51
  52         /** @var bool */
  53         private $mBlockEmail;
  54
  55         /** @var bool */
  56         private $mDisableUsertalk;
  57
  58         /** @var bool */
  59         private $mCreateAccount;
  60
  61         /** @var User|string */
  62         private $target;
  63
  64         /** @var int Hack for foreign blocking (CentralAuth) */
  65         private $forcedTargetID;
  66
  67         /** @var int Block::TYPE_ constant. Can only be USER, IP or RANGE internally */
  68         private $type;
  69
  70         /** @var User */
  71         private $blocker;
  72
  73         /** @var bool */
  74         private $isHardblock;
  75
  76         /** @var bool */
  77         private $isAutoblocking;
  78
  79         /** @var string|null */
  80         private $systemBlockType;
  81
  82         # TYPE constants
  83         const TYPE_USER = 1;
  84         const TYPE_IP = 2;
  85         const TYPE_RANGE = 3;
  86         const TYPE_AUTO = 4;
  87         const TYPE_ID = 5;
  88
  89         /**
  90          * Create a new block with specified parameters on a user, IP or IP range.
  91          *
  92          * @param array $options Parameters of the block:
  93          *     address string|User  Target user name, User object, IP address or IP range
  94          *     user int             Override target user ID (for foreign users)
  95          *     by int               User ID of the blocker
  96          *     reason string        Reason of the block
  97          *     timestamp string     The time at which the block comes into effect
  98          *     auto bool            Is this an automatic block?
  99          *     expiry string        Timestamp of expiration of the block or 'infinity'
 100          *     anonOnly bool        Only disallow anonymous actions
 101          *     createAccount bool   Disallow creation of new accounts
 102          *     enableAutoblock bool Enable automatic blocking
 103          *     hideName bool        Hide the target user name
 104          *     blockEmail bool      Disallow sending emails
 105          *     allowUsertalk bool   Allow the target to edit its own talk page
 106          *     byText string        Username of the blocker (for foreign users)
 107          *     systemBlock string   Indicate that this block is automatically
 108          *                          created by MediaWiki rather than being stored
 109          *                          in the database. Value is a string to return
 110          *                          from self::getSystemBlockType().
 111          *
 112          * @since 1.26 accepts $options array instead of individual parameters; order
 113          * of parameters above reflects the original order
 114          */
 115         function __construct( $options = [] ) {
 116                 $defaults = [
 117                         'address'         => '',
 118                         'user'            => null,
 119                         'by'              => null,
 120                         'reason'          => '',
 121                         'timestamp'       => '',
 122                         'auto'            => false,
 123                         'expiry'          => '',
 124                         'anonOnly'        => false,
 125                         'createAccount'   => false,
 126                         'enableAutoblock' => false,
 127                         'hideName'        => false,
 128                         'blockEmail'      => false,
 129                         'allowUsertalk'   => false,
 130                         'byText'          => '',
 131                         'systemBlock'     => null,
 132                 ];
 133
 134                 if ( func_num_args() > 1 || !is_array( $options ) ) {
 135                         $options = array_combine(
 136                                 array_slice( array_keys( $defaults ), 0, func_num_args() ),
 137                                 func_get_args()
 138                         );
 139                         wfDeprecated( __METHOD__ . ' with multiple arguments', '1.26' );
 140                 }
 141
 142                 $options += $defaults;
 143
 144                 $this->setTarget( $options['address'] );
 145
 146                 if ( $this->target instanceof User && $options['user'] ) {
 147                         # Needed for foreign users
 148                         $this->forcedTargetID = $options['user'];
 149                 }
 150
 151                 if ( $options['by'] ) {
 152                         # Local user
 153                         $this->setBlocker( User::newFromId( $options['by'] ) );
 154                 } else {
 155                         # Foreign user
 156                         $this->setBlocker( $options['byText'] );
 157                 }
 158
 159                 $this->mReason = $options['reason'];
 160                 $this->mTimestamp = wfTimestamp( TS_MW, $options['timestamp'] );
 161                 $this->mExpiry = wfGetDB( DB_REPLICA )->decodeExpiry( $options['expiry'] );
 162
 163                 # Boolean settings
 164                 $this->mAuto = (bool)$options['auto'];
 165                 $this->mHideName = (bool)$options['hideName'];
 166                 $this->isHardblock( !$options['anonOnly'] );
 167                 $this->isAutoblocking( (bool)$options['enableAutoblock'] );
 168
 169                 # Prevention measures
 170                 $this->prevents( 'sendemail', (bool)$options['blockEmail'] );
 171                 $this->prevents( 'editownusertalk', !$options['allowUsertalk'] );
 172                 $this->prevents( 'createaccount', (bool)$options['createAccount'] );
 173
 174                 $this->mFromMaster = false;
 175                 $this->systemBlockType = $options['systemBlock'];
 176         }
 177
 178         /**
 179          * Load a blocked user from their block id.
 180          *
 181          * @param int $id Block id to search for
 182          * @return Block|null
 183          */
 184         public static function newFromID( $id ) {
 185                 $dbr = wfGetDB( DB_REPLICA );
 186                 $res = $dbr->selectRow(
 187                         'ipblocks',
 188                         self::selectFields(),
 189                         [ 'ipb_id' => $id ],
 190                         __METHOD__
 191                 );
 192                 if ( $res ) {
 193                         return self::newFromRow( $res );
 194                 } else {
 195                         return null;
 196                 }
 197         }
 198
 199         /**
 200          * Return the list of ipblocks fields that should be selected to create
 201          * a new block.
 202          * @return array
 203          */
 204         public static function selectFields() {
 205                 return [
 206                         'ipb_id',
 207                         'ipb_address',
 208                         'ipb_by',
 209                         'ipb_by_text',
 210                         'ipb_reason',
 211                         'ipb_timestamp',
 212                         'ipb_auto',
 213                         'ipb_anon_only',
 214                         'ipb_create_account',
 215                         'ipb_enable_autoblock',
 216                         'ipb_expiry',
 217                         'ipb_deleted',
 218                         'ipb_block_email',
 219                         'ipb_allow_usertalk',
 220                         'ipb_parent_block_id',
 221                 ];
 222         }
 223
 224         /**
 225          * Check if two blocks are effectively equal.  Doesn't check irrelevant things like
 226          * the blocking user or the block timestamp, only things which affect the blocked user
 227          *
 228          * @param Block $block
 229          *
 230          * @return bool
 231          */
 232         public function equals( Block $block ) {
 233                 return (
 234                         (string)$this->target == (string)$block->target
 235                         && $this->type == $block->type
 236                         && $this->mAuto == $block->mAuto
 237                         && $this->isHardblock() == $block->isHardblock()
 238                         && $this->prevents( 'createaccount' ) == $block->prevents( 'createaccount' )
 239                         && $this->mExpiry == $block->mExpiry
 240                         && $this->isAutoblocking() == $block->isAutoblocking()
 241                         && $this->mHideName == $block->mHideName
 242                         && $this->prevents( 'sendemail' ) == $block->prevents( 'sendemail' )
 243                         && $this->prevents( 'editownusertalk' ) == $block->prevents( 'editownusertalk' )
 244                         && $this->mReason == $block->mReason
 245                 );
 246         }
 247
 248         /**
 249          * Load a block from the database which affects the already-set $this->target:
 250          *     1) A block directly on the given user or IP
 251          *     2) A rangeblock encompassing the given IP (smallest first)
 252          *     3) An autoblock on the given IP
 253          * @param User|string $vagueTarget Also search for blocks affecting this target.  Doesn't
 254          *     make any sense to use TYPE_AUTO / TYPE_ID here. Leave blank to skip IP lookups.
 255          * @throws MWException
 256          * @return bool Whether a relevant block was found
 257          */
 258         protected function newLoad( $vagueTarget = null ) {
 259                 $db = wfGetDB( $this->mFromMaster ? DB_MASTER : DB_REPLICA );
 260
 261                 if ( $this->type !== null ) {
 262                         $conds = [
 263                                 'ipb_address' => [ (string)$this->target ],
 264                         ];
 265                 } else {
 266                         $conds = [ 'ipb_address' => [] ];
 267                 }
 268
 269                 # Be aware that the != '' check is explicit, since empty values will be
 270                 # passed by some callers (T31116)
 271                 if ( $vagueTarget != '' ) {
 272                         list( $target, $type ) = self::parseTarget( $vagueTarget );
 273                         switch ( $type ) {
 274                                 case self::TYPE_USER:
 275                                         # Slightly weird, but who are we to argue?
 276                                         $conds['ipb_address'][] = (string)$target;
 277                                         break;
 278
 279                                 case self::TYPE_IP:
 280                                         $conds['ipb_address'][] = (string)$target;
 281                                         $conds[] = self::getRangeCond( IP::toHex( $target ) );
 282                                         $conds = $db->makeList( $conds, LIST_OR );
 283                                         break;
 284
 285                                 case self::TYPE_RANGE:
 286                                         list( $start, $end ) = IP::parseRange( $target );
 287                                         $conds['ipb_address'][] = (string)$target;
 288                                         $conds[] = self::getRangeCond( $start, $end );
 289                                         $conds = $db->makeList( $conds, LIST_OR );
 290                                         break;
 291
 292                                 default:
 293                                         throw new MWException( "Tried to load block with invalid type" );
 294                         }
 295                 }
 296
 297                 $res = $db->select( 'ipblocks', self::selectFields(), $conds, __METHOD__ );
 298
 299                 # This result could contain a block on the user, a block on the IP, and a russian-doll
 300                 # set of rangeblocks.  We want to choose the most specific one, so keep a leader board.
 301                 $bestRow = null;
 302
 303                 # Lower will be better
 304                 $bestBlockScore = 100;
 305
 306                 # This is begging for $this = $bestBlock, but that's not allowed in PHP :(
 307                 $bestBlockPreventsEdit = null;
 308
 309                 foreach ( $res as $row ) {
 310                         $block = self::newFromRow( $row );
 311
 312                         # Don't use expired blocks
 313                         if ( $block->isExpired() ) {
 314                                 continue;
 315                         }
 316
 317                         # Don't use anon only blocks on users
 318                         if ( $this->type == self::TYPE_USER && !$block->isHardblock() ) {
 319                                 continue;
 320                         }
 321
 322                         if ( $block->getType() == self::TYPE_RANGE ) {
 323                                 # This is the number of bits that are allowed to vary in the block, give
 324                                 # or take some floating point errors
 325                                 $end = Wikimedia\base_convert( $block->getRangeEnd(), 16, 10 );
 326                                 $start = Wikimedia\base_convert( $block->getRangeStart(), 16, 10 );
 327                                 $size = log( $end - $start + 1, 2 );
 328
 329                                 # This has the nice property that a /32 block is ranked equally with a
 330                                 # single-IP block, which is exactly what it is...
 331                                 $score = self::TYPE_RANGE - 1 + ( $size / 128 );
 332
 333                         } else {
 334                                 $score = $block->getType();
 335                         }
 336
 337                         if ( $score < $bestBlockScore ) {
 338                                 $bestBlockScore = $score;
 339                                 $bestRow = $row;
 340                                 $bestBlockPreventsEdit = $block->prevents( 'edit' );
 341                         }
 342                 }
 343
 344                 if ( $bestRow !== null ) {
 345                         $this->initFromRow( $bestRow );
 346                         $this->prevents( 'edit', $bestBlockPreventsEdit );
 347                         return true;
 348                 } else {
 349                         return false;
 350                 }
 351         }
 352
 353         /**
 354          * Get a set of SQL conditions which will select rangeblocks encompassing a given range
 355          * @param string $start Hexadecimal IP representation
 356          * @param string $end Hexadecimal IP representation, or null to use $start = $end
 357          * @return string
 358          */
 359         public static function getRangeCond( $start, $end = null ) {
 360                 if ( $end === null ) {
 361                         $end = $start;
 362                 }
 363                 # Per T16634, we want to include relevant active rangeblocks; for
 364                 # rangeblocks, we want to include larger ranges which enclose the given
 365                 # range. We know that all blocks must be smaller than $wgBlockCIDRLimit,
 366                 # so we can improve performance by filtering on a LIKE clause
 367                 $chunk = self::getIpFragment( $start );
 368                 $dbr = wfGetDB( DB_REPLICA );
 369                 $like = $dbr->buildLike( $chunk, $dbr->anyString() );
 370
 371                 # Fairly hard to make a malicious SQL statement out of hex characters,
 372                 # but stranger things have happened...
 373                 $safeStart = $dbr->addQuotes( $start );
 374                 $safeEnd = $dbr->addQuotes( $end );
 375
 376                 return $dbr->makeList(
 377                         [
 378                                 "ipb_range_start $like",
 379                                 "ipb_range_start <= $safeStart",
 380                                 "ipb_range_end >= $safeEnd",
 381                         ],
 382                         LIST_AND
 383                 );
 384         }
 385
 386         /**
 387          * Get the component of an IP address which is certain to be the same between an IP
 388          * address and a rangeblock containing that IP address.
 389          * @param string $hex Hexadecimal IP representation
 390          * @return string
 391          */
 392         protected static function getIpFragment( $hex ) {
 393                 global $wgBlockCIDRLimit;
 394                 if ( substr( $hex, 0, 3 ) == 'v6-' ) {
 395                         return 'v6-' . substr( substr( $hex, 3 ), 0, floor( $wgBlockCIDRLimit['IPv6'] / 4 ) );
 396                 } else {
 397                         return substr( $hex, 0, floor( $wgBlockCIDRLimit['IPv4'] / 4 ) );
 398                 }
 399         }
 400
 401         /**
 402          * Given a database row from the ipblocks table, initialize
 403          * member variables
 404          * @param stdClass $row A row from the ipblocks table
 405          */
 406         protected function initFromRow( $row ) {
 407                 $this->setTarget( $row->ipb_address );
 408                 if ( $row->ipb_by ) { // local user
 409                         $this->setBlocker( User::newFromId( $row->ipb_by ) );
 410                 } else { // foreign user
 411                         $this->setBlocker( $row->ipb_by_text );
 412                 }
 413
 414                 $this->mReason = $row->ipb_reason;
 415                 $this->mTimestamp = wfTimestamp( TS_MW, $row->ipb_timestamp );
 416                 $this->mAuto = $row->ipb_auto;
 417                 $this->mHideName = $row->ipb_deleted;
 418                 $this->mId = (int)$row->ipb_id;
 419                 $this->mParentBlockId = $row->ipb_parent_block_id;
 420
 421                 // I wish I didn't have to do this
 422                 $this->mExpiry = wfGetDB( DB_REPLICA )->decodeExpiry( $row->ipb_expiry );
 423
 424                 $this->isHardblock( !$row->ipb_anon_only );
 425                 $this->isAutoblocking( $row->ipb_enable_autoblock );
 426
 427                 $this->prevents( 'createaccount', $row->ipb_create_account );
 428                 $this->prevents( 'sendemail', $row->ipb_block_email );
 429                 $this->prevents( 'editownusertalk', !$row->ipb_allow_usertalk );
 430         }
 431
 432         /**
 433          * Create a new Block object from a database row
 434          * @param stdClass $row Row from the ipblocks table
 435          * @return Block
 436          */
 437         public static function newFromRow( $row ) {
 438                 $block = new Block;
 439                 $block->initFromRow( $row );
 440                 return $block;
 441         }
 442
 443         /**
 444          * Delete the row from the IP blocks table.
 445          *
 446          * @throws MWException
 447          * @return bool
 448          */
 449         public function delete() {
 450                 if ( wfReadOnly() ) {
 451                         return false;
 452                 }
 453
 454                 if ( !$this->getId() ) {
 455                         throw new MWException( "Block::delete() requires that the mId member be filled\n" );
 456                 }
 457
 458                 $dbw = wfGetDB( DB_MASTER );
 459                 $dbw->delete( 'ipblocks', [ 'ipb_parent_block_id' => $this->getId() ], __METHOD__ );
 460                 $dbw->delete( 'ipblocks', [ 'ipb_id' => $this->getId() ], __METHOD__ );
 461
 462                 return $dbw->affectedRows() > 0;
 463         }
 464
 465         /**
 466          * Insert a block into the block table. Will fail if there is a conflicting
 467          * block (same name and options) already in the database.
 468          *
 469          * @param IDatabase $dbw If you have one available
 470          * @return bool|array False on failure, assoc array on success:
 471          *      ('id' => block ID, 'autoIds' => array of autoblock IDs)
 472          */
 473         public function insert( $dbw = null ) {
 474                 global $wgBlockDisablesLogin;
 475
 476                 if ( $this->getSystemBlockType() !== null ) {
 477                         throw new MWException( 'Cannot insert a system block into the database' );
 478                 }
 479
 480                 wfDebug( "Block::insert; timestamp {$this->mTimestamp}\n" );
 481
 482                 if ( $dbw === null ) {
 483                         $dbw = wfGetDB( DB_MASTER );
 484                 }
 485
 486                 # Periodic purge via commit hooks
 487                 if ( mt_rand( 0, 9 ) == 0 ) {
 488                         self::purgeExpired();
 489                 }
 490
 491                 $row = $this->getDatabaseArray();
 492                 $row['ipb_id'] = $dbw->nextSequenceValue( "ipblocks_ipb_id_seq" );
 493
 494                 $dbw->insert( 'ipblocks', $row, __METHOD__, [ 'IGNORE' ] );
 495                 $affected = $dbw->affectedRows();
 496                 $this->mId = $dbw->insertId();
 497
 498                 # Don't collide with expired blocks.
 499                 # Do this after trying to insert to avoid locking.
 500                 if ( !$affected ) {
 501                         # T96428: The ipb_address index uses a prefix on a field, so
 502                         # use a standard SELECT + DELETE to avoid annoying gap locks.
 503                         $ids = $dbw->selectFieldValues( 'ipblocks',
 504                                 'ipb_id',
 505                                 [
 506                                         'ipb_address' => $row['ipb_address'],
 507                                         'ipb_user' => $row['ipb_user'],
 508                                         'ipb_expiry < ' . $dbw->addQuotes( $dbw->timestamp() )
 509                                 ],
 510                                 __METHOD__
 511                         );
 512                         if ( $ids ) {
 513                                 $dbw->delete( 'ipblocks', [ 'ipb_id' => $ids ], __METHOD__ );
 514                                 $dbw->insert( 'ipblocks', $row, __METHOD__, [ 'IGNORE' ] );
 515                                 $affected = $dbw->affectedRows();
 516                                 $this->mId = $dbw->insertId();
 517                         }
 518                 }
 519
 520                 if ( $affected ) {
 521                         $auto_ipd_ids = $this->doRetroactiveAutoblock();
 522
 523                         if ( $wgBlockDisablesLogin && $this->target instanceof User ) {
 524                                 // Change user login token to force them to be logged out.
 525                                 $this->target->setToken();
 526                                 $this->target->saveSettings();
 527                         }
 528
 529                         return [ 'id' => $this->mId, 'autoIds' => $auto_ipd_ids ];
 530                 }
 531
 532                 return false;
 533         }
 534
 535         /**
 536          * Update a block in the DB with new parameters.
 537          * The ID field needs to be loaded first.
 538          *
 539          * @return bool|array False on failure, array on success:
 540          *   ('id' => block ID, 'autoIds' => array of autoblock IDs)
 541          */
 542         public function update() {
 543                 wfDebug( "Block::update; timestamp {$this->mTimestamp}\n" );
 544                 $dbw = wfGetDB( DB_MASTER );
 545
 546                 $dbw->startAtomic( __METHOD__ );
 547
 548                 $dbw->update(
 549                         'ipblocks',
 550                         $this->getDatabaseArray( $dbw ),
 551                         [ 'ipb_id' => $this->getId() ],
 552                         __METHOD__
 553                 );
 554
 555                 $affected = $dbw->affectedRows();
 556
 557                 if ( $this->isAutoblocking() ) {
 558                         // update corresponding autoblock(s) (T50813)
 559                         $dbw->update(
 560                                 'ipblocks',
 561                                 $this->getAutoblockUpdateArray(),
 562                                 [ 'ipb_parent_block_id' => $this->getId() ],
 563                                 __METHOD__
 564                         );
 565                 } else {
 566                         // autoblock no longer required, delete corresponding autoblock(s)
 567                         $dbw->delete(
 568                                 'ipblocks',
 569                                 [ 'ipb_parent_block_id' => $this->getId() ],
 570                                 __METHOD__
 571                         );
 572                 }
 573
 574                 $dbw->endAtomic( __METHOD__ );
 575
 576                 if ( $affected ) {
 577                         $auto_ipd_ids = $this->doRetroactiveAutoblock();
 578                         return [ 'id' => $this->mId, 'autoIds' => $auto_ipd_ids ];
 579                 }
 580
 581                 return false;
 582         }
 583
 584         /**
 585          * Get an array suitable for passing to $dbw->insert() or $dbw->update()
 586          * @param IDatabase $db
 587          * @return array
 588          */
 589         protected function getDatabaseArray( $db = null ) {
 590                 if ( !$db ) {
 591                         $db = wfGetDB( DB_REPLICA );
 592                 }
 593                 $expiry = $db->encodeExpiry( $this->mExpiry );
 594
 595                 if ( $this->forcedTargetID ) {
 596                         $uid = $this->forcedTargetID;
 597                 } else {
 598                         $uid = $this->target instanceof User ? $this->target->getId() : 0;
 599                 }
 600
 601                 $a = [
 602                         'ipb_address'          => (string)$this->target,
 603                         'ipb_user'             => $uid,
 604                         'ipb_by'               => $this->getBy(),
 605                         'ipb_by_text'          => $this->getByName(),
 606                         'ipb_reason'           => $this->mReason,
 607                         'ipb_timestamp'        => $db->timestamp( $this->mTimestamp ),
 608                         'ipb_auto'             => $this->mAuto,
 609                         'ipb_anon_only'        => !$this->isHardblock(),
 610                         'ipb_create_account'   => $this->prevents( 'createaccount' ),
 611                         'ipb_enable_autoblock' => $this->isAutoblocking(),
 612                         'ipb_expiry'           => $expiry,
 613                         'ipb_range_start'      => $this->getRangeStart(),
 614                         'ipb_range_end'        => $this->getRangeEnd(),
 615                         'ipb_deleted'          => intval( $this->mHideName ), // typecast required for SQLite
 616                         'ipb_block_email'      => $this->prevents( 'sendemail' ),
 617                         'ipb_allow_usertalk'   => !$this->prevents( 'editownusertalk' ),
 618                         'ipb_parent_block_id'  => $this->mParentBlockId
 619                 ];
 620
 621                 return $a;
 622         }
 623
 624         /**
 625          * @return array
 626          */
 627         protected function getAutoblockUpdateArray() {
 628                 return [
 629                         'ipb_by'               => $this->getBy(),
 630                         'ipb_by_text'          => $this->getByName(),
 631                         'ipb_reason'           => $this->mReason,
 632                         'ipb_create_account'   => $this->prevents( 'createaccount' ),
 633                         'ipb_deleted'          => (int)$this->mHideName, // typecast required for SQLite
 634                         'ipb_allow_usertalk'   => !$this->prevents( 'editownusertalk' ),
 635                 ];
 636         }
 637
 638         /**
 639          * Retroactively autoblocks the last IP used by the user (if it is a user)
 640          * blocked by this Block.
 641          *
 642          * @return array Block IDs of retroactive autoblocks made
 643          */
 644         protected function doRetroactiveAutoblock() {
 645                 $blockIds = [];
 646                 # If autoblock is enabled, autoblock the LAST IP(s) used
 647                 if ( $this->isAutoblocking() && $this->getType() == self::TYPE_USER ) {
 648                         wfDebug( "Doing retroactive autoblocks for " . $this->getTarget() . "\n" );
 649
 650                         $continue = Hooks::run(
 651                                 'PerformRetroactiveAutoblock', [ $this, &$blockIds ] );
 652
 653                         if ( $continue ) {
 654                                 self::defaultRetroactiveAutoblock( $this, $blockIds );
 655                         }
 656                 }
 657                 return $blockIds;
 658         }
 659
 660         /**
 661          * Retroactively autoblocks the last IP used by the user (if it is a user)
 662          * blocked by this Block. This will use the recentchanges table.
 663          *
 664          * @param Block $block
 665          * @param array &$blockIds
 666          */
 667         protected static function defaultRetroactiveAutoblock( Block $block, array &$blockIds ) {
 668                 global $wgPutIPinRC;
 669
 670                 // No IPs are in recentchanges table, so nothing to select
 671                 if ( !$wgPutIPinRC ) {
 672                         return;
 673                 }
 674
 675                 $dbr = wfGetDB( DB_REPLICA );
 676
 677                 $options = [ 'ORDER BY' => 'rc_timestamp DESC' ];
 678                 $conds = [ 'rc_user_text' => (string)$block->getTarget() ];
 679
 680                 // Just the last IP used.
 681                 $options['LIMIT'] = 1;
 682
 683                 $res = $dbr->select( 'recentchanges', [ 'rc_ip' ], $conds,
 684                         __METHOD__, $options );
 685
 686                 if ( !$res->numRows() ) {
 687                         # No results, don't autoblock anything
 688                         wfDebug( "No IP found to retroactively autoblock\n" );
 689                 } else {
 690                         foreach ( $res as $row ) {
 691                                 if ( $row->rc_ip ) {
 692                                         $id = $block->doAutoblock( $row->rc_ip );
 693                                         if ( $id ) {
 694                                                 $blockIds[] = $id;
 695                                         }
 696                                 }
 697                         }
 698                 }
 699         }
 700
 701         /**
 702          * Checks whether a given IP is on the autoblock whitelist.
 703          * TODO: this probably belongs somewhere else, but not sure where...
 704          *
 705          * @param string $ip The IP to check
 706          * @return bool
 707          */
 708         public static function isWhitelistedFromAutoblocks( $ip ) {
 709                 // Try to get the autoblock_whitelist from the cache, as it's faster
 710                 // than getting the msg raw and explode()'ing it.
 711                 $cache = MediaWikiServices::getInstance()->getMainWANObjectCache();
 712                 $lines = $cache->getWithSetCallback(
 713                         $cache->makeKey( 'ipb', 'autoblock', 'whitelist' ),
 714                         $cache::TTL_DAY,
 715                         function ( $curValue, &$ttl, array &$setOpts ) {
 716                                 $setOpts += Database::getCacheSetOptions( wfGetDB( DB_REPLICA ) );
 717
 718                                 return explode( "\n",
 719                                         wfMessage( 'autoblock_whitelist' )->inContentLanguage()->plain() );
 720                         }
 721                 );
 722
 723                 wfDebug( "Checking the autoblock whitelist..\n" );
 724
 725                 foreach ( $lines as $line ) {
 726                         # List items only
 727                         if ( substr( $line, 0, 1 ) !== '*' ) {
 728                                 continue;
 729                         }
 730
 731                         $wlEntry = substr( $line, 1 );
 732                         $wlEntry = trim( $wlEntry );
 733
 734                         wfDebug( "Checking $ip against $wlEntry..." );
 735
 736                         # Is the IP in this range?
 737                         if ( IP::isInRange( $ip, $wlEntry ) ) {
 738                                 wfDebug( " IP $ip matches $wlEntry, not autoblocking\n" );
 739                                 return true;
 740                         } else {
 741                                 wfDebug( " No match\n" );
 742                         }
 743                 }
 744
 745                 return false;
 746         }
 747
 748         /**
 749          * Autoblocks the given IP, referring to this Block.
 750          *
 751          * @param string $autoblockIP The IP to autoblock.
 752          * @return int|bool Block ID if an autoblock was inserted, false if not.
 753          */
 754         public function doAutoblock( $autoblockIP ) {
 755                 # If autoblocks are disabled, go away.
 756                 if ( !$this->isAutoblocking() ) {
 757                         return false;
 758                 }
 759
 760                 # Don't autoblock for system blocks
 761                 if ( $this->getSystemBlockType() !== null ) {
 762                         throw new MWException( 'Cannot autoblock from a system block' );
 763                 }
 764
 765                 # Check for presence on the autoblock whitelist.
 766                 if ( self::isWhitelistedFromAutoblocks( $autoblockIP ) ) {
 767                         return false;
 768                 }
 769
 770                 // Avoid PHP 7.1 warning of passing $this by reference
 771                 $block = $this;
 772                 # Allow hooks to cancel the autoblock.
 773                 if ( !Hooks::run( 'AbortAutoblock', [ $autoblockIP, &$block ] ) ) {
 774                         wfDebug( "Autoblock aborted by hook.\n" );
 775                         return false;
 776                 }
 777
 778                 # It's okay to autoblock. Go ahead and insert/update the block...
 779
 780                 # Do not add a *new* block if the IP is already blocked.
 781                 $ipblock = self::newFromTarget( $autoblockIP );
 782                 if ( $ipblock ) {
 783                         # Check if the block is an autoblock and would exceed the user block
 784                         # if renewed. If so, do nothing, otherwise prolong the block time...
 785                         if ( $ipblock->mAuto && // @todo Why not compare $ipblock->mExpiry?
 786                                 $this->mExpiry > self::getAutoblockExpiry( $ipblock->mTimestamp )
 787                         ) {
 788                                 # Reset block timestamp to now and its expiry to
 789                                 # $wgAutoblockExpiry in the future
 790                                 $ipblock->updateTimestamp();
 791                         }
 792                         return false;
 793                 }
 794
 795                 # Make a new block object with the desired properties.
 796                 $autoblock = new Block;
 797                 wfDebug( "Autoblocking {$this->getTarget()}@" . $autoblockIP . "\n" );
 798                 $autoblock->setTarget( $autoblockIP );
 799                 $autoblock->setBlocker( $this->getBlocker() );
 800                 $autoblock->mReason = wfMessage( 'autoblocker', $this->getTarget(), $this->mReason )
 801                         ->inContentLanguage()->plain();
 802                 $timestamp = wfTimestampNow();
 803                 $autoblock->mTimestamp = $timestamp;
 804                 $autoblock->mAuto = 1;
 805                 $autoblock->prevents( 'createaccount', $this->prevents( 'createaccount' ) );
 806                 # Continue suppressing the name if needed
 807                 $autoblock->mHideName = $this->mHideName;
 808                 $autoblock->prevents( 'editownusertalk', $this->prevents( 'editownusertalk' ) );
 809                 $autoblock->mParentBlockId = $this->mId;
 810
 811                 if ( $this->mExpiry == 'infinity' ) {
 812                         # Original block was indefinite, start an autoblock now
 813                         $autoblock->mExpiry = self::getAutoblockExpiry( $timestamp );
 814                 } else {
 815                         # If the user is already blocked with an expiry date, we don't
 816                         # want to pile on top of that.
 817                         $autoblock->mExpiry = min( $this->mExpiry, self::getAutoblockExpiry( $timestamp ) );
 818                 }
 819
 820                 # Insert the block...
 821                 $status = $autoblock->insert();
 822                 return $status
 823                         ? $status['id']
 824                         : false;
 825         }
 826
 827         /**
 828          * Check if a block has expired. Delete it if it is.
 829          * @return bool
 830          */
 831         public function deleteIfExpired() {
 832                 if ( $this->isExpired() ) {
 833                         wfDebug( "Block::deleteIfExpired() -- deleting\n" );
 834                         $this->delete();
 835                         $retVal = true;
 836                 } else {
 837                         wfDebug( "Block::deleteIfExpired() -- not expired\n" );
 838                         $retVal = false;
 839                 }
 840
 841                 return $retVal;
 842         }
 843
 844         /**
 845          * Has the block expired?
 846          * @return bool
 847          */
 848         public function isExpired() {
 849                 $timestamp = wfTimestampNow();
 850                 wfDebug( "Block::isExpired() checking current " . $timestamp . " vs $this->mExpiry\n" );
 851
 852                 if ( !$this->mExpiry ) {
 853                         return false;
 854                 } else {
 855                         return $timestamp > $this->mExpiry;
 856                 }
 857         }
 858
 859         /**
 860          * Is the block address valid (i.e. not a null string?)
 861          * @return bool
 862          */
 863         public function isValid() {
 864                 return $this->getTarget() != null;
 865         }
 866
 867         /**
 868          * Update the timestamp on autoblocks.
 869          */
 870         public function updateTimestamp() {
 871                 if ( $this->mAuto ) {
 872                         $this->mTimestamp = wfTimestamp();
 873                         $this->mExpiry = self::getAutoblockExpiry( $this->mTimestamp );
 874
 875                         $dbw = wfGetDB( DB_MASTER );
 876                         $dbw->update( 'ipblocks',
 877                                 [ /* SET */
 878                                         'ipb_timestamp' => $dbw->timestamp( $this->mTimestamp ),
 879                                         'ipb_expiry' => $dbw->timestamp( $this->mExpiry ),
 880                                 ],
 881                                 [ /* WHERE */
 882                                         'ipb_id' => $this->getId(),
 883                                 ],
 884                                 __METHOD__
 885                         );
 886                 }
 887         }
 888
 889         /**
 890          * Get the IP address at the start of the range in Hex form
 891          * @throws MWException
 892          * @return string IP in Hex form
 893          */
 894         public function getRangeStart() {
 895                 switch ( $this->type ) {
 896                         case self::TYPE_USER:
 897                                 return '';
 898                         case self::TYPE_IP:
 899                                 return IP::toHex( $this->target );
 900                         case self::TYPE_RANGE:
 901                                 list( $start, /*...*/ ) = IP::parseRange( $this->target );
 902                                 return $start;
 903                         default:
 904                                 throw new MWException( "Block with invalid type" );
 905                 }
 906         }
 907
 908         /**
 909          * Get the IP address at the end of the range in Hex form
 910          * @throws MWException
 911          * @return string IP in Hex form
 912          */
 913         public function getRangeEnd() {
 914                 switch ( $this->type ) {
 915                         case self::TYPE_USER:
 916                                 return '';
 917                         case self::TYPE_IP:
 918                                 return IP::toHex( $this->target );
 919                         case self::TYPE_RANGE:
 920                                 list( /*...*/, $end ) = IP::parseRange( $this->target );
 921                                 return $end;
 922                         default:
 923                                 throw new MWException( "Block with invalid type" );
 924                 }
 925         }
 926
 927         /**
 928          * Get the user id of the blocking sysop
 929          *
 930          * @return int (0 for foreign users)
 931          */
 932         public function getBy() {
 933                 $blocker = $this->getBlocker();
 934                 return ( $blocker instanceof User )
 935                         ? $blocker->getId()
 936                         : 0;
 937         }
 938
 939         /**
 940          * Get the username of the blocking sysop
 941          *
 942          * @return string
 943          */
 944         public function getByName() {
 945                 $blocker = $this->getBlocker();
 946                 return ( $blocker instanceof User )
 947                         ? $blocker->getName()
 948                         : (string)$blocker; // username
 949         }
 950
 951         /**
 952          * Get the block ID
 953          * @return int
 954          */
 955         public function getId() {
 956                 return $this->mId;
 957         }
 958
 959         /**
 960          * Get the system block type, if any
 961          * @since 1.29
 962          * @return string|null
 963          */
 964         public function getSystemBlockType() {
 965                 return $this->systemBlockType;
 966         }
 967
 968         /**
 969          * Get/set a flag determining whether the master is used for reads
 970          *
 971          * @param bool|null $x
 972          * @return bool
 973          */
 974         public function fromMaster( $x = null ) {
 975                 return wfSetVar( $this->mFromMaster, $x );
 976         }
 977
 978         /**
 979          * Get/set whether the Block is a hardblock (affects logged-in users on a given IP/range)
 980          * @param bool|null $x
 981          * @return bool
 982          */
 983         public function isHardblock( $x = null ) {
 984                 wfSetVar( $this->isHardblock, $x );
 985
 986                 # You can't *not* hardblock a user
 987                 return $this->getType() == self::TYPE_USER
 988                         ? true
 989                         : $this->isHardblock;
 990         }
 991
 992         /**
 993          * @param null|bool $x
 994          * @return bool
 995          */
 996         public function isAutoblocking( $x = null ) {
 997                 wfSetVar( $this->isAutoblocking, $x );
 998
 999                 # You can't put an autoblock on an IP or range as we don't have any history to
1000                 # look over to get more IPs from
1001                 return $this->getType() == self::TYPE_USER
1002                         ? $this->isAutoblocking
1003                         : false;
1004         }
1005
1006         /**
1007          * Get/set whether the Block prevents a given action
1008          *
1009          * @param string $action Action to check
1010          * @param bool|null $x Value for set, or null to just get value
1011          * @return bool|null Null for unrecognized rights.
1012          */
1013         public function prevents( $action, $x = null ) {
1014                 global $wgBlockDisablesLogin;
1015                 $res = null;
1016                 switch ( $action ) {
1017                         case 'edit':
1018                                 # For now... <evil laugh>
1019                                 $res = true;
1020                                 break;
1021                         case 'createaccount':
1022                                 $res = wfSetVar( $this->mCreateAccount, $x );
1023                                 break;
1024                         case 'sendemail':
1025                                 $res = wfSetVar( $this->mBlockEmail, $x );
1026                                 break;
1027                         case 'editownusertalk':
1028                                 $res = wfSetVar( $this->mDisableUsertalk, $x );
1029                                 break;
1030                         case 'read':
1031                                 $res = false;
1032                                 break;
1033                 }
1034                 if ( !$res && $wgBlockDisablesLogin ) {
1035                         // If a block would disable login, then it should
1036                         // prevent any action that all users cannot do
1037                         $anon = new User;
1038                         $res = $anon->isAllowed( $action ) ? $res : true;
1039                 }
1040
1041                 return $res;
1042         }
1043
1044         /**
1045          * Get the block name, but with autoblocked IPs hidden as per standard privacy policy
1046          * @return string Text is escaped
1047          */
1048         public function getRedactedName() {
1049                 if ( $this->mAuto ) {
1050                         return Html::rawElement(
1051                                 'span',
1052                                 [ 'class' => 'mw-autoblockid' ],
1053                                 wfMessage( 'autoblockid', $this->mId )
1054                         );
1055                 } else {
1056                         return htmlspecialchars( $this->getTarget() );
1057                 }
1058         }
1059
1060         /**
1061          * Get a timestamp of the expiry for autoblocks
1062          *
1063          * @param string|int $timestamp
1064          * @return string
1065          */
1066         public static function getAutoblockExpiry( $timestamp ) {
1067                 global $wgAutoblockExpiry;
1068
1069                 return wfTimestamp( TS_MW, wfTimestamp( TS_UNIX, $timestamp ) + $wgAutoblockExpiry );
1070         }
1071
1072         /**
1073          * Purge expired blocks from the ipblocks table
1074          */
1075         public static function purgeExpired() {
1076                 if ( wfReadOnly() ) {
1077                         return;
1078                 }
1079
1080                 DeferredUpdates::addUpdate( new AtomicSectionUpdate(
1081                         wfGetDB( DB_MASTER ),
1082                         __METHOD__,
1083                         function ( IDatabase $dbw, $fname ) {
1084                                 $dbw->delete(
1085                                         'ipblocks',
1086                                         [ 'ipb_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ],
1087                                         $fname
1088                                 );
1089                         }
1090                 ) );
1091         }
1092
1093         /**
1094          * Given a target and the target's type, get an existing Block object if possible.
1095          * @param string|User|int $specificTarget A block target, which may be one of several types:
1096          *     * A user to block, in which case $target will be a User
1097          *     * An IP to block, in which case $target will be a User generated by using
1098          *       User::newFromName( $ip, false ) to turn off name validation
1099          *     * An IP range, in which case $target will be a String "123.123.123.123/18" etc
1100          *     * The ID of an existing block, in the format "#12345" (since pure numbers are valid
1101          *       usernames
1102          *     Calling this with a user, IP address or range will not select autoblocks, and will
1103          *     only select a block where the targets match exactly (so looking for blocks on
1104          *     1.2.3.4 will not select 1.2.0.0/16 or even 1.2.3.4/32)
1105          * @param string|User|int $vagueTarget As above, but we will search for *any* block which
1106          *     affects that target (so for an IP address, get ranges containing that IP; and also
1107          *     get any relevant autoblocks). Leave empty or blank to skip IP-based lookups.
1108          * @param bool $fromMaster Whether to use the DB_MASTER database
1109          * @return Block|null (null if no relevant block could be found).  The target and type
1110          *     of the returned Block will refer to the actual block which was found, which might
1111          *     not be the same as the target you gave if you used $vagueTarget!
1112          */
1113         public static function newFromTarget( $specificTarget, $vagueTarget = null, $fromMaster = false ) {
1114                 list( $target, $type ) = self::parseTarget( $specificTarget );
1115                 if ( $type == self::TYPE_ID || $type == self::TYPE_AUTO ) {
1116                         return self::newFromID( $target );
1117
1118                 } elseif ( $target === null && $vagueTarget == '' ) {
1119                         # We're not going to find anything useful here
1120                         # Be aware that the == '' check is explicit, since empty values will be
1121                         # passed by some callers (T31116)
1122                         return null;
1123
1124                 } elseif ( in_array(
1125                         $type,
1126                         [ self::TYPE_USER, self::TYPE_IP, self::TYPE_RANGE, null ] )
1127                 ) {
1128                         $block = new Block();
1129                         $block->fromMaster( $fromMaster );
1130
1131                         if ( $type !== null ) {
1132                                 $block->setTarget( $target );
1133                         }
1134
1135                         if ( $block->newLoad( $vagueTarget ) ) {
1136                                 return $block;
1137                         }
1138                 }
1139                 return null;
1140         }
1141
1142         /**
1143          * Get all blocks that match any IP from an array of IP addresses
1144          *
1145          * @param array $ipChain List of IPs (strings), usually retrieved from the
1146          *     X-Forwarded-For header of the request
1147          * @param bool $isAnon Exclude anonymous-only blocks if false
1148          * @param bool $fromMaster Whether to query the master or replica DB
1149          * @return array Array of Blocks
1150          * @since 1.22
1151          */
1152         public static function getBlocksForIPList( array $ipChain, $isAnon, $fromMaster = false ) {
1153                 if ( !count( $ipChain ) ) {
1154                         return [];
1155                 }
1156
1157                 $conds = [];
1158                 $proxyLookup = MediaWikiServices::getInstance()->getProxyLookup();
1159                 foreach ( array_unique( $ipChain ) as $ipaddr ) {
1160                         # Discard invalid IP addresses. Since XFF can be spoofed and we do not
1161                         # necessarily trust the header given to us, make sure that we are only
1162                         # checking for blocks on well-formatted IP addresses (IPv4 and IPv6).
1163                         # Do not treat private IP spaces as special as it may be desirable for wikis
1164                         # to block those IP ranges in order to stop misbehaving proxies that spoof XFF.
1165                         if ( !IP::isValid( $ipaddr ) ) {
1166                                 continue;
1167                         }
1168                         # Don't check trusted IPs (includes local squids which will be in every request)
1169                         if ( $proxyLookup->isTrustedProxy( $ipaddr ) ) {
1170                                 continue;
1171                         }
1172                         # Check both the original IP (to check against single blocks), as well as build
1173                         # the clause to check for rangeblocks for the given IP.
1174                         $conds['ipb_address'][] = $ipaddr;
1175                         $conds[] = self::getRangeCond( IP::toHex( $ipaddr ) );
1176                 }
1177
1178                 if ( !count( $conds ) ) {
1179                         return [];
1180                 }
1181
1182                 if ( $fromMaster ) {
1183                         $db = wfGetDB( DB_MASTER );
1184                 } else {
1185                         $db = wfGetDB( DB_REPLICA );
1186                 }
1187                 $conds = $db->makeList( $conds, LIST_OR );
1188                 if ( !$isAnon ) {
1189                         $conds = [ $conds, 'ipb_anon_only' => 0 ];
1190                 }
1191                 $selectFields = array_merge(
1192                         [ 'ipb_range_start', 'ipb_range_end' ],
1193                         self::selectFields()
1194                 );
1195                 $rows = $db->select( 'ipblocks',
1196                         $selectFields,
1197                         $conds,
1198                         __METHOD__
1199                 );
1200
1201                 $blocks = [];
1202                 foreach ( $rows as $row ) {
1203                         $block = self::newFromRow( $row );
1204                         if ( !$block->isExpired() ) {
1205                                 $blocks[] = $block;
1206                         }
1207                 }
1208
1209                 return $blocks;
1210         }
1211
1212         /**
1213          * From a list of multiple blocks, find the most exact and strongest Block.
1214          *
1215          * The logic for finding the "best" block is:
1216          *  - Blocks that match the block's target IP are preferred over ones in a range
1217          *  - Hardblocks are chosen over softblocks that prevent account creation
1218          *  - Softblocks that prevent account creation are chosen over other softblocks
1219          *  - Other softblocks are chosen over autoblocks
1220          *  - If there are multiple exact or range blocks at the same level, the one chosen
1221          *    is random
1222          * This should be used when $blocks where retrieved from the user's IP address
1223          * and $ipChain is populated from the same IP address information.
1224          *
1225          * @param array $blocks Array of Block objects
1226          * @param array $ipChain List of IPs (strings). This is used to determine how "close"
1227          *     a block is to the server, and if a block matches exactly, or is in a range.
1228          *     The order is furthest from the server to nearest e.g., (Browser, proxy1, proxy2,
1229          *     local-squid, ...)
1230          * @throws MWException
1231          * @return Block|null The "best" block from the list
1232          */
1233         public static function chooseBlock( array $blocks, array $ipChain ) {
1234                 if ( !count( $blocks ) ) {
1235                         return null;
1236                 } elseif ( count( $blocks ) == 1 ) {
1237                         return $blocks[0];
1238                 }
1239
1240                 // Sort hard blocks before soft ones and secondarily sort blocks
1241                 // that disable account creation before those that don't.
1242                 usort( $blocks, function ( Block $a, Block $b ) {
1243                         $aWeight = (int)$a->isHardblock() . (int)$a->prevents( 'createaccount' );
1244                         $bWeight = (int)$b->isHardblock() . (int)$b->prevents( 'createaccount' );
1245                         return strcmp( $bWeight, $aWeight ); // highest weight first
1246                 } );
1247
1248                 $blocksListExact = [
1249                         'hard' => false,
1250                         'disable_create' => false,
1251                         'other' => false,
1252                         'auto' => false
1253                 ];
1254                 $blocksListRange = [
1255                         'hard' => false,
1256                         'disable_create' => false,
1257                         'other' => false,
1258                         'auto' => false
1259                 ];
1260                 $ipChain = array_reverse( $ipChain );
1261
1262                 /** @var Block $block */
1263                 foreach ( $blocks as $block ) {
1264                         // Stop searching if we have already have a "better" block. This
1265                         // is why the order of the blocks matters
1266                         if ( !$block->isHardblock() && $blocksListExact['hard'] ) {
1267                                 break;
1268                         } elseif ( !$block->prevents( 'createaccount' ) && $blocksListExact['disable_create'] ) {
1269                                 break;
1270                         }
1271
1272                         foreach ( $ipChain as $checkip ) {
1273                                 $checkipHex = IP::toHex( $checkip );
1274                                 if ( (string)$block->getTarget() === $checkip ) {
1275                                         if ( $block->isHardblock() ) {
1276                                                 $blocksListExact['hard'] = $blocksListExact['hard'] ?: $block;
1277                                         } elseif ( $block->prevents( 'createaccount' ) ) {
1278                                                 $blocksListExact['disable_create'] = $blocksListExact['disable_create'] ?: $block;
1279                                         } elseif ( $block->mAuto ) {
1280                                                 $blocksListExact['auto'] = $blocksListExact['auto'] ?: $block;
1281                                         } else {
1282                                                 $blocksListExact['other'] = $blocksListExact['other'] ?: $block;
1283                                         }
1284                                         // We found closest exact match in the ip list, so go to the next Block
1285                                         break;
1286                                 } elseif ( array_filter( $blocksListExact ) == []
1287                                         && $block->getRangeStart() <= $checkipHex
1288                                         && $block->getRangeEnd() >= $checkipHex
1289                                 ) {
1290                                         if ( $block->isHardblock() ) {
1291                                                 $blocksListRange['hard'] = $blocksListRange['hard'] ?: $block;
1292                                         } elseif ( $block->prevents( 'createaccount' ) ) {
1293                                                 $blocksListRange['disable_create'] = $blocksListRange['disable_create'] ?: $block;
1294                                         } elseif ( $block->mAuto ) {
1295                                                 $blocksListRange['auto'] = $blocksListRange['auto'] ?: $block;
1296                                         } else {
1297                                                 $blocksListRange['other'] = $blocksListRange['other'] ?: $block;
1298                                         }
1299                                         break;
1300                                 }
1301                         }
1302                 }
1303
1304                 if ( array_filter( $blocksListExact ) == [] ) {
1305                         $blocksList = &$blocksListRange;
1306                 } else {
1307                         $blocksList = &$blocksListExact;
1308                 }
1309
1310                 $chosenBlock = null;
1311                 if ( $blocksList['hard'] ) {
1312                         $chosenBlock = $blocksList['hard'];
1313                 } elseif ( $blocksList['disable_create'] ) {
1314                         $chosenBlock = $blocksList['disable_create'];
1315                 } elseif ( $blocksList['other'] ) {
1316                         $chosenBlock = $blocksList['other'];
1317                 } elseif ( $blocksList['auto'] ) {
1318                         $chosenBlock = $blocksList['auto'];
1319                 } else {
1320                         throw new MWException( "Proxy block found, but couldn't be classified." );
1321                 }
1322
1323                 return $chosenBlock;
1324         }
1325
1326         /**
1327          * From an existing Block, get the target and the type of target.
1328          * Note that, except for null, it is always safe to treat the target
1329          * as a string; for User objects this will return User::__toString()
1330          * which in turn gives User::getName().
1331          *
1332          * @param string|int|User|null $target
1333          * @return array( User|String|null, Block::TYPE_ constant|null )
1334          */
1335         public static function parseTarget( $target ) {
1336                 # We may have been through this before
1337                 if ( $target instanceof User ) {
1338                         if ( IP::isValid( $target->getName() ) ) {
1339                                 return [ $target, self::TYPE_IP ];
1340                         } else {
1341                                 return [ $target, self::TYPE_USER ];
1342                         }
1343                 } elseif ( $target === null ) {
1344                         return [ null, null ];
1345                 }
1346
1347                 $target = trim( $target );
1348
1349                 if ( IP::isValid( $target ) ) {
1350                         # We can still create a User if it's an IP address, but we need to turn
1351                         # off validation checking (which would exclude IP addresses)
1352                         return [
1353                                 User::newFromName( IP::sanitizeIP( $target ), false ),
1354                                 self::TYPE_IP
1355                         ];
1356
1357                 } elseif ( IP::isValidBlock( $target ) ) {
1358                         # Can't create a User from an IP range
1359                         return [ IP::sanitizeRange( $target ), self::TYPE_RANGE ];
1360                 }
1361
1362                 # Consider the possibility that this is not a username at all
1363                 # but actually an old subpage (bug #29797)
1364                 if ( strpos( $target, '/' ) !== false ) {
1365                         # An old subpage, drill down to the user behind it
1366                         $target = explode( '/', $target )[0];
1367                 }
1368
1369                 $userObj = User::newFromName( $target );
1370                 if ( $userObj instanceof User ) {
1371                         # Note that since numbers are valid usernames, a $target of "12345" will be
1372                         # considered a User.  If you want to pass a block ID, prepend a hash "#12345",
1373                         # since hash characters are not valid in usernames or titles generally.
1374                         return [ $userObj, self::TYPE_USER ];
1375
1376                 } elseif ( preg_match( '/^#\d+$/', $target ) ) {
1377                         # Autoblock reference in the form "#12345"
1378                         return [ substr( $target, 1 ), self::TYPE_AUTO ];
1379
1380                 } else {
1381                         # WTF?
1382                         return [ null, null ];
1383                 }
1384         }
1385
1386         /**
1387          * Get the type of target for this particular block
1388          * @return int Block::TYPE_ constant, will never be TYPE_ID
1389          */
1390         public function getType() {
1391                 return $this->mAuto
1392                         ? self::TYPE_AUTO
1393                         : $this->type;
1394         }
1395
1396         /**
1397          * Get the target and target type for this particular Block.  Note that for autoblocks,
1398          * this returns the unredacted name; frontend functions need to call $block->getRedactedName()
1399          * in this situation.
1400          * @return array( User|String, Block::TYPE_ constant )
1401          * @todo FIXME: This should be an integral part of the Block member variables
1402          */
1403         public function getTargetAndType() {
1404                 return [ $this->getTarget(), $this->getType() ];
1405         }
1406
1407         /**
1408          * Get the target for this particular Block.  Note that for autoblocks,
1409          * this returns the unredacted name; frontend functions need to call $block->getRedactedName()
1410          * in this situation.
1411          * @return User|string
1412          */
1413         public function getTarget() {
1414                 return $this->target;
1415         }
1416
1417         /**
1418          * @since 1.19
1419          *
1420          * @return mixed|string
1421          */
1422         public function getExpiry() {
1423                 return $this->mExpiry;
1424         }
1425
1426         /**
1427          * Set the target for this block, and update $this->type accordingly
1428          * @param mixed $target
1429          */
1430         public function setTarget( $target ) {
1431                 list( $this->target, $this->type ) = self::parseTarget( $target );
1432         }
1433
1434         /**
1435          * Get the user who implemented this block
1436          * @return User|string Local User object or string for a foreign user
1437          */
1438         public function getBlocker() {
1439                 return $this->blocker;
1440         }
1441
1442         /**
1443          * Set the user who implemented (or will implement) this block
1444          * @param User|string $user Local User object or username string for foreign users
1445          */
1446         public function setBlocker( $user ) {
1447                 $this->blocker = $user;
1448         }
1449
1450         /**
1451          * Set the 'BlockID' cookie to this block's ID and expiry time. The cookie's expiry will be
1452          * the same as the block's, to a maximum of 24 hours.
1453          *
1454          * @since 1.29
1455          *
1456          * @param WebResponse $response The response on which to set the cookie.
1457          */
1458         public function setCookie( WebResponse $response ) {
1459                 // Calculate the default expiry time.
1460                 $maxExpiryTime = wfTimestamp( TS_MW, wfTimestamp() + ( 24 * 60 * 60 ) );
1461
1462                 // Use the Block's expiry time only if it's less than the default.
1463                 $expiryTime = $this->getExpiry();
1464                 if ( $expiryTime === 'infinity' || $expiryTime > $maxExpiryTime ) {
1465                         $expiryTime = $maxExpiryTime;
1466                 }
1467
1468                 // Set the cookie. Reformat the MediaWiki datetime as a Unix timestamp for the cookie.
1469                 $expiryValue = DateTime::createFromFormat( 'YmdHis', $expiryTime )->format( 'U' );
1470                 $cookieOptions = [ 'httpOnly' => false ];
1471                 $cookieValue = $this->getCookieValue();
1472                 $response->setCookie( 'BlockID', $cookieValue, $expiryValue, $cookieOptions );
1473         }
1474
1475         /**
1476          * Unset the 'BlockID' cookie.
1477          *
1478          * @since 1.29
1479          *
1480          * @param WebResponse $response The response on which to unset the cookie.
1481          */
1482         public static function clearCookie( WebResponse $response ) {
1483                 $response->clearCookie( 'BlockID', [ 'httpOnly' => false ] );
1484         }
1485
1486         /**
1487          * Get the BlockID cookie's value for this block. This is usually the block ID concatenated
1488          * with an HMAC in order to avoid spoofing (T152951), but if wgSecretKey is not set will just
1489          * be the block ID.
1490          *
1491          * @since 1.29
1492          *
1493          * @return string The block ID, probably concatenated with "!" and the HMAC.
1494          */
1495         public function getCookieValue() {
1496                 $config = RequestContext::getMain()->getConfig();
1497                 $id = $this->getId();
1498                 $secretKey = $config->get( 'SecretKey' );
1499                 if ( !$secretKey ) {
1500                         // If there's no secret key, don't append a HMAC.
1501                         return $id;
1502                 }
1503                 $hmac = MWCryptHash::hmac( $id, $secretKey, false );
1504                 $cookieValue = $id . '!' . $hmac;
1505                 return $cookieValue;
1506         }
1507
1508         /**
1509          * Get the stored ID from the 'BlockID' cookie. The cookie's value is usually a combination of
1510          * the ID and a HMAC (see Block::setCookie), but will sometimes only be the ID.
1511          *
1512          * @since 1.29
1513          *
1514          * @param string $cookieValue The string in which to find the ID.
1515          *
1516          * @return int|null The block ID, or null if the HMAC is present and invalid.
1517          */
1518         public static function getIdFromCookieValue( $cookieValue ) {
1519                 // Extract the ID prefix from the cookie value (may be the whole value, if no bang found).
1520                 $bangPos = strpos( $cookieValue, '!' );
1521                 $id = ( $bangPos === false ) ? $cookieValue : substr( $cookieValue, 0, $bangPos );
1522                 // Get the site-wide secret key.
1523                 $config = RequestContext::getMain()->getConfig();
1524                 $secretKey = $config->get( 'SecretKey' );
1525                 if ( !$secretKey ) {
1526                         // If there's no secret key, just use the ID as given.
1527                         return $id;
1528                 }
1529                 $storedHmac = substr( $cookieValue, $bangPos + 1 );
1530                 $calculatedHmac = MWCryptHash::hmac( $id, $secretKey, false );
1531                 if ( $calculatedHmac === $storedHmac ) {
1532                         return $id;
1533                 } else {
1534                         return null;
1535                 }
1536         }
1537
1538         /**
1539          * Get the key and parameters for the corresponding error message.
1540          *
1541          * @since 1.22
1542          * @param IContextSource $context
1543          * @return array
1544          */
1545         public function getPermissionsError( IContextSource $context ) {
1546                 $blocker = $this->getBlocker();
1547                 if ( $blocker instanceof User ) { // local user
1548                         $blockerUserpage = $blocker->getUserPage();
1549                         $link = "[[{$blockerUserpage->getPrefixedText()}|{$blockerUserpage->getText()}]]";
1550                 } else { // foreign user
1551                         $link = $blocker;
1552                 }
1553
1554                 $reason = $this->mReason;
1555                 if ( $reason == '' ) {
1556                         $reason = $context->msg( 'blockednoreason' )->text();
1557                 }
1558
1559                 /* $ip returns who *is* being blocked, $intended contains who was meant to be blocked.
1560                  * This could be a username, an IP range, or a single IP. */
1561                 $intended = $this->getTarget();
1562
1563                 $systemBlockType = $this->getSystemBlockType();
1564
1565                 $lang = $context->getLanguage();
1566                 return [
1567                         $systemBlockType !== null
1568                                 ? 'systemblockedtext'
1569                                 : ( $this->mAuto ? 'autoblockedtext' : 'blockedtext' ),
1570                         $link,
1571                         $reason,
1572                         $context->getRequest()->getIP(),
1573                         $this->getByName(),
1574                         $systemBlockType !== null ? $systemBlockType : $this->getId(),
1575                         $lang->formatExpiry( $this->mExpiry ),
1576                         (string)$intended,
1577                         $lang->userTimeAndDate( $this->mTimestamp, $context->getUser() ),
1578                 ];
1579         }
1580 }