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\Block\BlockRestriction;
  26 use MediaWiki\Block\Restriction\Restriction;
  27 use MediaWiki\MediaWikiServices;
  28
  29 class Block {
  30         /** @var string */
  31         public $mReason;
  32
  33         /** @var string */
  34         public $mTimestamp;
  35
  36         /** @var bool */
  37         public $mAuto;
  38
  39         /** @var string */
  40         public $mExpiry;
  41
  42         /** @var bool */
  43         public $mHideName;
  44
  45         /** @var int */
  46         public $mParentBlockId;
  47
  48         /** @var int */
  49         private $mId;
  50
  51         /** @var bool */
  52         private $mFromMaster;
  53
  54         /** @var bool */
  55         private $mBlockEmail;
  56
  57         /** @var bool */
  58         private $mDisableUsertalk;
  59
  60         /** @var bool */
  61         private $mCreateAccount;
  62
  63         /** @var User|string */
  64         private $target;
  65
  66         /** @var int Hack for foreign blocking (CentralAuth) */
  67         private $forcedTargetID;
  68
  69         /** @var int Block::TYPE_ constant. Can only be USER, IP or RANGE internally */
  70         private $type;
  71
  72         /** @var User */
  73         private $blocker;
  74
  75         /** @var bool */
  76         private $isHardblock;
  77
  78         /** @var bool */
  79         private $isAutoblocking;
  80
  81         /** @var string|null */
  82         private $systemBlockType;
  83
  84         /** @var bool */
  85         private $isSitewide;
  86
  87         /** @var Restriction[] */
  88         private $restrictions;
  89
  90         # TYPE constants
  91         const TYPE_USER = 1;
  92         const TYPE_IP = 2;
  93         const TYPE_RANGE = 3;
  94         const TYPE_AUTO = 4;
  95         const TYPE_ID = 5;
  96
  97         /**
  98          * Create a new block with specified parameters on a user, IP or IP range.
  99          *
 100          * @param array $options Parameters of the block:
 101          *     address string|User  Target user name, User object, IP address or IP range
 102          *     user int             Override target user ID (for foreign users)
 103          *     by int               User ID of the blocker
 104          *     reason string        Reason of the block
 105          *     timestamp string     The time at which the block comes into effect
 106          *     auto bool            Is this an automatic block?
 107          *     expiry string        Timestamp of expiration of the block or 'infinity'
 108          *     anonOnly bool        Only disallow anonymous actions
 109          *     createAccount bool   Disallow creation of new accounts
 110          *     enableAutoblock bool Enable automatic blocking
 111          *     hideName bool        Hide the target user name
 112          *     blockEmail bool      Disallow sending emails
 113          *     allowUsertalk bool   Allow the target to edit its own talk page
 114          *     byText string        Username of the blocker (for foreign users)
 115          *     systemBlock string   Indicate that this block is automatically
 116          *                          created by MediaWiki rather than being stored
 117          *                          in the database. Value is a string to return
 118          *                          from self::getSystemBlockType().
 119          *
 120          * @since 1.26 accepts $options array instead of individual parameters; order
 121          * of parameters above reflects the original order
 122          */
 123         function __construct( $options = [] ) {
 124                 $defaults = [
 125                         'address'         => '',
 126                         'user'            => null,
 127                         'by'              => null,
 128                         'reason'          => '',
 129                         'timestamp'       => '',
 130                         'auto'            => false,
 131                         'expiry'          => '',
 132                         'anonOnly'        => false,
 133                         'createAccount'   => false,
 134                         'enableAutoblock' => false,
 135                         'hideName'        => false,
 136                         'blockEmail'      => false,
 137                         'allowUsertalk'   => false,
 138                         'byText'          => '',
 139                         'systemBlock'     => null,
 140                         'sitewide'        => true,
 141                 ];
 142
 143                 if ( func_num_args() > 1 || !is_array( $options ) ) {
 144                         $options = array_combine(
 145                                 array_slice( array_keys( $defaults ), 0, func_num_args() ),
 146                                 func_get_args()
 147                         );
 148                         wfDeprecated( __METHOD__ . ' with multiple arguments', '1.26' );
 149                 }
 150
 151                 $options += $defaults;
 152
 153                 $this->setTarget( $options['address'] );
 154
 155                 if ( $this->target instanceof User && $options['user'] ) {
 156                         # Needed for foreign users
 157                         $this->forcedTargetID = $options['user'];
 158                 }
 159
 160                 if ( $options['by'] ) {
 161                         # Local user
 162                         $this->setBlocker( User::newFromId( $options['by'] ) );
 163                 } else {
 164                         # Foreign user
 165                         $this->setBlocker( $options['byText'] );
 166                 }
 167
 168                 $this->mReason = $options['reason'];
 169                 $this->mTimestamp = wfTimestamp( TS_MW, $options['timestamp'] );
 170                 $this->mExpiry = wfGetDB( DB_REPLICA )->decodeExpiry( $options['expiry'] );
 171
 172                 # Boolean settings
 173                 $this->mAuto = (bool)$options['auto'];
 174                 $this->mHideName = (bool)$options['hideName'];
 175                 $this->isHardblock( !$options['anonOnly'] );
 176                 $this->isAutoblocking( (bool)$options['enableAutoblock'] );
 177                 $this->isSitewide( (bool)$options['sitewide'] );
 178
 179                 # Prevention measures
 180                 $this->prevents( 'sendemail', (bool)$options['blockEmail'] );
 181                 $this->prevents( 'editownusertalk', !$options['allowUsertalk'] );
 182                 $this->prevents( 'createaccount', (bool)$options['createAccount'] );
 183
 184                 $this->mFromMaster = false;
 185                 $this->systemBlockType = $options['systemBlock'];
 186         }
 187
 188         /**
 189          * Load a blocked user from their block id.
 190          *
 191          * @param int $id Block id to search for
 192          * @return Block|null
 193          */
 194         public static function newFromID( $id ) {
 195                 $dbr = wfGetDB( DB_REPLICA );
 196                 $blockQuery = self::getQueryInfo();
 197                 $res = $dbr->selectRow(
 198                         $blockQuery['tables'],
 199                         $blockQuery['fields'],
 200                         [ 'ipb_id' => $id ],
 201                         __METHOD__,
 202                         [],
 203                         $blockQuery['joins']
 204                 );
 205                 if ( $res ) {
 206                         return self::newFromRow( $res );
 207                 } else {
 208                         return null;
 209                 }
 210         }
 211
 212         /**
 213          * Return the list of ipblocks fields that should be selected to create
 214          * a new block.
 215          * @deprecated since 1.31, use self::getQueryInfo() instead.
 216          * @return array
 217          */
 218         public static function selectFields() {
 219                 global $wgActorTableSchemaMigrationStage;
 220
 221                 if ( $wgActorTableSchemaMigrationStage & SCHEMA_COMPAT_READ_NEW ) {
 222                         // If code is using this instead of self::getQueryInfo(), there's a
 223                         // decent chance it's going to try to directly access
 224                         // $row->ipb_by or $row->ipb_by_text and we can't give it
 225                         // useful values here once those aren't being used anymore.
 226                         throw new BadMethodCallException(
 227                                 'Cannot use ' . __METHOD__
 228                                         . ' when $wgActorTableSchemaMigrationStage has SCHEMA_COMPAT_READ_NEW'
 229                         );
 230                 }
 231
 232                 wfDeprecated( __METHOD__, '1.31' );
 233                 return [
 234                         'ipb_id',
 235                         'ipb_address',
 236                         'ipb_by',
 237                         'ipb_by_text',
 238                         'ipb_by_actor' => 'NULL',
 239                         'ipb_timestamp',
 240                         'ipb_auto',
 241                         'ipb_anon_only',
 242                         'ipb_create_account',
 243                         'ipb_enable_autoblock',
 244                         'ipb_expiry',
 245                         'ipb_deleted',
 246                         'ipb_block_email',
 247                         'ipb_allow_usertalk',
 248                         'ipb_parent_block_id',
 249                         'ipb_sitewide',
 250                 ] + CommentStore::getStore()->getFields( 'ipb_reason' );
 251         }
 252
 253         /**
 254          * Return the tables, fields, and join conditions to be selected to create
 255          * a new block object.
 256          * @since 1.31
 257          * @return array With three keys:
 258          *   - tables: (string[]) to include in the `$table` to `IDatabase->select()`
 259          *   - fields: (string[]) to include in the `$vars` to `IDatabase->select()`
 260          *   - joins: (array) to include in the `$join_conds` to `IDatabase->select()`
 261          */
 262         public static function getQueryInfo() {
 263                 $commentQuery = CommentStore::getStore()->getJoin( 'ipb_reason' );
 264                 $actorQuery = ActorMigration::newMigration()->getJoin( 'ipb_by' );
 265                 return [
 266                         'tables' => [ 'ipblocks' ] + $commentQuery['tables'] + $actorQuery['tables'],
 267                         'fields' => [
 268                                 'ipb_id',
 269                                 'ipb_address',
 270                                 'ipb_timestamp',
 271                                 'ipb_auto',
 272                                 'ipb_anon_only',
 273                                 'ipb_create_account',
 274                                 'ipb_enable_autoblock',
 275                                 'ipb_expiry',
 276                                 'ipb_deleted',
 277                                 'ipb_block_email',
 278                                 'ipb_allow_usertalk',
 279                                 'ipb_parent_block_id',
 280                                 'ipb_sitewide',
 281                         ] + $commentQuery['fields'] + $actorQuery['fields'],
 282                         'joins' => $commentQuery['joins'] + $actorQuery['joins'],
 283                 ];
 284         }
 285
 286         /**
 287          * Check if two blocks are effectively equal.  Doesn't check irrelevant things like
 288          * the blocking user or the block timestamp, only things which affect the blocked user
 289          *
 290          * @param Block $block
 291          *
 292          * @return bool
 293          */
 294         public function equals( Block $block ) {
 295                 return (
 296                         (string)$this->target == (string)$block->target
 297                         && $this->type == $block->type
 298                         && $this->mAuto == $block->mAuto
 299                         && $this->isHardblock() == $block->isHardblock()
 300                         && $this->prevents( 'createaccount' ) == $block->prevents( 'createaccount' )
 301                         && $this->mExpiry == $block->mExpiry
 302                         && $this->isAutoblocking() == $block->isAutoblocking()
 303                         && $this->mHideName == $block->mHideName
 304                         && $this->prevents( 'sendemail' ) == $block->prevents( 'sendemail' )
 305                         && $this->prevents( 'editownusertalk' ) == $block->prevents( 'editownusertalk' )
 306                         && $this->mReason == $block->mReason
 307                         && $this->isSitewide() == $block->isSitewide()
 308                         // Block::getRestrictions() may perform a database query, so keep it at
 309                         // the end.
 310                         && BlockRestriction::equals( $this->getRestrictions(), $block->getRestrictions() )
 311                 );
 312         }
 313
 314         /**
 315          * Load a block from the database which affects the already-set $this->target:
 316          *     1) A block directly on the given user or IP
 317          *     2) A rangeblock encompassing the given IP (smallest first)
 318          *     3) An autoblock on the given IP
 319          * @param User|string|null $vagueTarget Also search for blocks affecting this target.  Doesn't
 320          *     make any sense to use TYPE_AUTO / TYPE_ID here. Leave blank to skip IP lookups.
 321          * @throws MWException
 322          * @return bool Whether a relevant block was found
 323          */
 324         protected function newLoad( $vagueTarget = null ) {
 325                 $db = wfGetDB( $this->mFromMaster ? DB_MASTER : DB_REPLICA );
 326
 327                 if ( $this->type !== null ) {
 328                         $conds = [
 329                                 'ipb_address' => [ (string)$this->target ],
 330                         ];
 331                 } else {
 332                         $conds = [ 'ipb_address' => [] ];
 333                 }
 334
 335                 # Be aware that the != '' check is explicit, since empty values will be
 336                 # passed by some callers (T31116)
 337                 if ( $vagueTarget != '' ) {
 338                         list( $target, $type ) = self::parseTarget( $vagueTarget );
 339                         switch ( $type ) {
 340                                 case self::TYPE_USER:
 341                                         # Slightly weird, but who are we to argue?
 342                                         $conds['ipb_address'][] = (string)$target;
 343                                         break;
 344
 345                                 case self::TYPE_IP:
 346                                         $conds['ipb_address'][] = (string)$target;
 347                                         $conds[] = self::getRangeCond( IP::toHex( $target ) );
 348                                         $conds = $db->makeList( $conds, LIST_OR );
 349                                         break;
 350
 351                                 case self::TYPE_RANGE:
 352                                         list( $start, $end ) = IP::parseRange( $target );
 353                                         $conds['ipb_address'][] = (string)$target;
 354                                         $conds[] = self::getRangeCond( $start, $end );
 355                                         $conds = $db->makeList( $conds, LIST_OR );
 356                                         break;
 357
 358                                 default:
 359                                         throw new MWException( "Tried to load block with invalid type" );
 360                         }
 361                 }
 362
 363                 $blockQuery = self::getQueryInfo();
 364                 $res = $db->select(
 365                         $blockQuery['tables'], $blockQuery['fields'], $conds, __METHOD__, [], $blockQuery['joins']
 366                 );
 367
 368                 # This result could contain a block on the user, a block on the IP, and a russian-doll
 369                 # set of rangeblocks.  We want to choose the most specific one, so keep a leader board.
 370                 $bestRow = null;
 371
 372                 # Lower will be better
 373                 $bestBlockScore = 100;
 374
 375                 # This is begging for $this = $bestBlock, but that's not allowed in PHP :(
 376                 $bestBlockPreventsEdit = null;
 377
 378                 foreach ( $res as $row ) {
 379                         $block = self::newFromRow( $row );
 380
 381                         # Don't use expired blocks
 382                         if ( $block->isExpired() ) {
 383                                 continue;
 384                         }
 385
 386                         # Don't use anon only blocks on users
 387                         if ( $this->type == self::TYPE_USER && !$block->isHardblock() ) {
 388                                 continue;
 389                         }
 390
 391                         if ( $block->getType() == self::TYPE_RANGE ) {
 392                                 # This is the number of bits that are allowed to vary in the block, give
 393                                 # or take some floating point errors
 394                                 $end = Wikimedia\base_convert( $block->getRangeEnd(), 16, 10 );
 395                                 $start = Wikimedia\base_convert( $block->getRangeStart(), 16, 10 );
 396                                 $size = log( $end - $start + 1, 2 );
 397
 398                                 # This has the nice property that a /32 block is ranked equally with a
 399                                 # single-IP block, which is exactly what it is...
 400                                 $score = self::TYPE_RANGE - 1 + ( $size / 128 );
 401
 402                         } else {
 403                                 $score = $block->getType();
 404                         }
 405
 406                         if ( $score < $bestBlockScore ) {
 407                                 $bestBlockScore = $score;
 408                                 $bestRow = $row;
 409                                 $bestBlockPreventsEdit = $block->prevents( 'edit' );
 410                         }
 411                 }
 412
 413                 if ( $bestRow !== null ) {
 414                         $this->initFromRow( $bestRow );
 415                         $this->prevents( 'edit', $bestBlockPreventsEdit );
 416                         return true;
 417                 } else {
 418                         return false;
 419                 }
 420         }
 421
 422         /**
 423          * Get a set of SQL conditions which will select rangeblocks encompassing a given range
 424          * @param string $start Hexadecimal IP representation
 425          * @param string|null $end Hexadecimal IP representation, or null to use $start = $end
 426          * @return string
 427          */
 428         public static function getRangeCond( $start, $end = null ) {
 429                 if ( $end === null ) {
 430                         $end = $start;
 431                 }
 432                 # Per T16634, we want to include relevant active rangeblocks; for
 433                 # rangeblocks, we want to include larger ranges which enclose the given
 434                 # range. We know that all blocks must be smaller than $wgBlockCIDRLimit,
 435                 # so we can improve performance by filtering on a LIKE clause
 436                 $chunk = self::getIpFragment( $start );
 437                 $dbr = wfGetDB( DB_REPLICA );
 438                 $like = $dbr->buildLike( $chunk, $dbr->anyString() );
 439
 440                 # Fairly hard to make a malicious SQL statement out of hex characters,
 441                 # but stranger things have happened...
 442                 $safeStart = $dbr->addQuotes( $start );
 443                 $safeEnd = $dbr->addQuotes( $end );
 444
 445                 return $dbr->makeList(
 446                         [
 447                                 "ipb_range_start $like",
 448                                 "ipb_range_start <= $safeStart",
 449                                 "ipb_range_end >= $safeEnd",
 450                         ],
 451                         LIST_AND
 452                 );
 453         }
 454
 455         /**
 456          * Get the component of an IP address which is certain to be the same between an IP
 457          * address and a rangeblock containing that IP address.
 458          * @param string $hex Hexadecimal IP representation
 459          * @return string
 460          */
 461         protected static function getIpFragment( $hex ) {
 462                 global $wgBlockCIDRLimit;
 463                 if ( substr( $hex, 0, 3 ) == 'v6-' ) {
 464                         return 'v6-' . substr( substr( $hex, 3 ), 0, floor( $wgBlockCIDRLimit['IPv6'] / 4 ) );
 465                 } else {
 466                         return substr( $hex, 0, floor( $wgBlockCIDRLimit['IPv4'] / 4 ) );
 467                 }
 468         }
 469
 470         /**
 471          * Given a database row from the ipblocks table, initialize
 472          * member variables
 473          * @param stdClass $row A row from the ipblocks table
 474          */
 475         protected function initFromRow( $row ) {
 476                 $this->setTarget( $row->ipb_address );
 477                 $this->setBlocker( User::newFromAnyId(
 478                         $row->ipb_by, $row->ipb_by_text, $row->ipb_by_actor ?? null
 479                 ) );
 480
 481                 $this->mTimestamp = wfTimestamp( TS_MW, $row->ipb_timestamp );
 482                 $this->mAuto = $row->ipb_auto;
 483                 $this->mHideName = $row->ipb_deleted;
 484                 $this->mId = (int)$row->ipb_id;
 485                 $this->mParentBlockId = $row->ipb_parent_block_id;
 486
 487                 // I wish I didn't have to do this
 488                 $db = wfGetDB( DB_REPLICA );
 489                 $this->mExpiry = $db->decodeExpiry( $row->ipb_expiry );
 490                 $this->mReason = CommentStore::getStore()
 491                         // Legacy because $row may have come from self::selectFields()
 492                         ->getCommentLegacy( $db, 'ipb_reason', $row )->text;
 493
 494                 $this->isHardblock( !$row->ipb_anon_only );
 495                 $this->isAutoblocking( $row->ipb_enable_autoblock );
 496                 $this->isSitewide( (bool)$row->ipb_sitewide );
 497
 498                 $this->prevents( 'createaccount', $row->ipb_create_account );
 499                 $this->prevents( 'sendemail', $row->ipb_block_email );
 500                 $this->prevents( 'editownusertalk', !$row->ipb_allow_usertalk );
 501         }
 502
 503         /**
 504          * Create a new Block object from a database row
 505          * @param stdClass $row Row from the ipblocks table
 506          * @return Block
 507          */
 508         public static function newFromRow( $row ) {
 509                 $block = new Block;
 510                 $block->initFromRow( $row );
 511                 return $block;
 512         }
 513
 514         /**
 515          * Delete the row from the IP blocks table.
 516          *
 517          * @throws MWException
 518          * @return bool
 519          */
 520         public function delete() {
 521                 if ( wfReadOnly() ) {
 522                         return false;
 523                 }
 524
 525                 if ( !$this->getId() ) {
 526                         throw new MWException( "Block::delete() requires that the mId member be filled\n" );
 527                 }
 528
 529                 $dbw = wfGetDB( DB_MASTER );
 530
 531                 BlockRestriction::deleteByParentBlockId( $this->getId() );
 532                 $dbw->delete( 'ipblocks', [ 'ipb_parent_block_id' => $this->getId() ], __METHOD__ );
 533
 534                 BlockRestriction::deleteByBlockId( $this->getId() );
 535                 $dbw->delete( 'ipblocks', [ 'ipb_id' => $this->getId() ], __METHOD__ );
 536
 537                 return $dbw->affectedRows() > 0;
 538         }
 539
 540         /**
 541          * Insert a block into the block table. Will fail if there is a conflicting
 542          * block (same name and options) already in the database.
 543          *
 544          * @param IDatabase|null $dbw If you have one available
 545          * @return bool|array False on failure, assoc array on success:
 546          *      ('id' => block ID, 'autoIds' => array of autoblock IDs)
 547          */
 548         public function insert( $dbw = null ) {
 549                 global $wgBlockDisablesLogin;
 550
 551                 if ( $this->getSystemBlockType() !== null ) {
 552                         throw new MWException( 'Cannot insert a system block into the database' );
 553                 }
 554                 if ( !$this->getBlocker() || $this->getBlocker()->getName() === '' ) {
 555                         throw new MWException( 'Cannot insert a block without a blocker set' );
 556                 }
 557
 558                 wfDebug( "Block::insert; timestamp {$this->mTimestamp}\n" );
 559
 560                 if ( $dbw === null ) {
 561                         $dbw = wfGetDB( DB_MASTER );
 562                 }
 563
 564                 self::purgeExpired();
 565
 566                 $row = $this->getDatabaseArray( $dbw );
 567
 568                 $dbw->insert( 'ipblocks', $row, __METHOD__, [ 'IGNORE' ] );
 569                 $affected = $dbw->affectedRows();
 570                 if ( $affected ) {
 571                         $this->setId( $dbw->insertId() );
 572                         if ( $this->restrictions ) {
 573                                 BlockRestriction::insert( $this->restrictions );
 574                         }
 575                 }
 576
 577                 # Don't collide with expired blocks.
 578                 # Do this after trying to insert to avoid locking.
 579                 if ( !$affected ) {
 580                         # T96428: The ipb_address index uses a prefix on a field, so
 581                         # use a standard SELECT + DELETE to avoid annoying gap locks.
 582                         $ids = $dbw->selectFieldValues( 'ipblocks',
 583                                 'ipb_id',
 584                                 [
 585                                         'ipb_address' => $row['ipb_address'],
 586                                         'ipb_user' => $row['ipb_user'],
 587                                         'ipb_expiry < ' . $dbw->addQuotes( $dbw->timestamp() )
 588                                 ],
 589                                 __METHOD__
 590                         );
 591                         if ( $ids ) {
 592                                 $dbw->delete( 'ipblocks', [ 'ipb_id' => $ids ], __METHOD__ );
 593                                 BlockRestriction::deleteByBlockId( $ids );
 594                                 $dbw->insert( 'ipblocks', $row, __METHOD__, [ 'IGNORE' ] );
 595                                 $affected = $dbw->affectedRows();
 596                                 $this->setId( $dbw->insertId() );
 597                                 if ( $this->restrictions ) {
 598                                         BlockRestriction::insert( $this->restrictions );
 599                                 }
 600                         }
 601                 }
 602
 603                 if ( $affected ) {
 604                         $auto_ipd_ids = $this->doRetroactiveAutoblock();
 605
 606                         if ( $wgBlockDisablesLogin && $this->target instanceof User ) {
 607                                 // Change user login token to force them to be logged out.
 608                                 $this->target->setToken();
 609                                 $this->target->saveSettings();
 610                         }
 611
 612                         return [ 'id' => $this->mId, 'autoIds' => $auto_ipd_ids ];
 613                 }
 614
 615                 return false;
 616         }
 617
 618         /**
 619          * Update a block in the DB with new parameters.
 620          * The ID field needs to be loaded first.
 621          *
 622          * @return bool|array False on failure, array on success:
 623          *   ('id' => block ID, 'autoIds' => array of autoblock IDs)
 624          */
 625         public function update() {
 626                 wfDebug( "Block::update; timestamp {$this->mTimestamp}\n" );
 627                 $dbw = wfGetDB( DB_MASTER );
 628
 629                 $dbw->startAtomic( __METHOD__ );
 630
 631                 $result = $dbw->update(
 632                         'ipblocks',
 633                         $this->getDatabaseArray( $dbw ),
 634                         [ 'ipb_id' => $this->getId() ],
 635                         __METHOD__
 636                 );
 637
 638                 // Only update the restrictions if they have been modified.
 639                 if ( $this->restrictions !== null ) {
 640                         // An empty array should remove all of the restrictions.
 641                         if ( empty( $this->restrictions ) ) {
 642                                 $success = BlockRestriction::deleteByBlockId( $this->getId() );
 643                         } else {
 644                                 $success = BlockRestriction::update( $this->restrictions );
 645                         }
 646                         // Update the result. The first false is the result, otherwise, true.
 647                         $result = $result && $success;
 648                 }
 649
 650                 if ( $this->isAutoblocking() ) {
 651                         // update corresponding autoblock(s) (T50813)
 652                         $dbw->update(
 653                                 'ipblocks',
 654                                 $this->getAutoblockUpdateArray( $dbw ),
 655                                 [ 'ipb_parent_block_id' => $this->getId() ],
 656                                 __METHOD__
 657                         );
 658
 659                         // Only update the restrictions if they have been modified.
 660                         if ( $this->restrictions !== null ) {
 661                                 BlockRestriction::updateByParentBlockId( $this->getId(), $this->restrictions );
 662                         }
 663                 } else {
 664                         // autoblock no longer required, delete corresponding autoblock(s)
 665                         BlockRestriction::deleteByParentBlockId( $this->getId() );
 666                         $dbw->delete(
 667                                 'ipblocks',
 668                                 [ 'ipb_parent_block_id' => $this->getId() ],
 669                                 __METHOD__
 670                         );
 671                 }
 672
 673                 $dbw->endAtomic( __METHOD__ );
 674
 675                 if ( $result ) {
 676                         $auto_ipd_ids = $this->doRetroactiveAutoblock();
 677                         return [ 'id' => $this->mId, 'autoIds' => $auto_ipd_ids ];
 678                 }
 679
 680                 return $result;
 681         }
 682
 683         /**
 684          * Get an array suitable for passing to $dbw->insert() or $dbw->update()
 685          * @param IDatabase $dbw
 686          * @return array
 687          */
 688         protected function getDatabaseArray( IDatabase $dbw ) {
 689                 $expiry = $dbw->encodeExpiry( $this->mExpiry );
 690
 691                 if ( $this->forcedTargetID ) {
 692                         $uid = $this->forcedTargetID;
 693                 } else {
 694                         $uid = $this->target instanceof User ? $this->target->getId() : 0;
 695                 }
 696
 697                 $a = [
 698                         'ipb_address'          => (string)$this->target,
 699                         'ipb_user'             => $uid,
 700                         'ipb_timestamp'        => $dbw->timestamp( $this->mTimestamp ),
 701                         'ipb_auto'             => $this->mAuto,
 702                         'ipb_anon_only'        => !$this->isHardblock(),
 703                         'ipb_create_account'   => $this->prevents( 'createaccount' ),
 704                         'ipb_enable_autoblock' => $this->isAutoblocking(),
 705                         'ipb_expiry'           => $expiry,
 706                         'ipb_range_start'      => $this->getRangeStart(),
 707                         'ipb_range_end'        => $this->getRangeEnd(),
 708                         'ipb_deleted'          => intval( $this->mHideName ), // typecast required for SQLite
 709                         'ipb_block_email'      => $this->prevents( 'sendemail' ),
 710                         'ipb_allow_usertalk'   => !$this->prevents( 'editownusertalk' ),
 711                         'ipb_parent_block_id'  => $this->mParentBlockId,
 712                         'ipb_sitewide'         => $this->isSitewide(),
 713                 ] + CommentStore::getStore()->insert( $dbw, 'ipb_reason', $this->mReason )
 714                         + ActorMigration::newMigration()->getInsertValues( $dbw, 'ipb_by', $this->getBlocker() );
 715
 716                 return $a;
 717         }
 718
 719         /**
 720          * @param IDatabase $dbw
 721          * @return array
 722          */
 723         protected function getAutoblockUpdateArray( IDatabase $dbw ) {
 724                 return [
 725                         'ipb_create_account'   => $this->prevents( 'createaccount' ),
 726                         'ipb_deleted'          => (int)$this->mHideName, // typecast required for SQLite
 727                         'ipb_allow_usertalk'   => !$this->prevents( 'editownusertalk' ),
 728                 ] + CommentStore::getStore()->insert( $dbw, 'ipb_reason', $this->mReason )
 729                         + ActorMigration::newMigration()->getInsertValues( $dbw, 'ipb_by', $this->getBlocker() );
 730         }
 731
 732         /**
 733          * Retroactively autoblocks the last IP used by the user (if it is a user)
 734          * blocked by this Block.
 735          *
 736          * @return array Block IDs of retroactive autoblocks made
 737          */
 738         protected function doRetroactiveAutoblock() {
 739                 $blockIds = [];
 740                 # If autoblock is enabled, autoblock the LAST IP(s) used
 741                 if ( $this->isAutoblocking() && $this->getType() == self::TYPE_USER ) {
 742                         wfDebug( "Doing retroactive autoblocks for " . $this->getTarget() . "\n" );
 743
 744                         $continue = Hooks::run(
 745                                 'PerformRetroactiveAutoblock', [ $this, &$blockIds ] );
 746
 747                         if ( $continue ) {
 748                                 self::defaultRetroactiveAutoblock( $this, $blockIds );
 749                         }
 750                 }
 751                 return $blockIds;
 752         }
 753
 754         /**
 755          * Retroactively autoblocks the last IP used by the user (if it is a user)
 756          * blocked by this Block. This will use the recentchanges table.
 757          *
 758          * @param Block $block
 759          * @param array &$blockIds
 760          */
 761         protected static function defaultRetroactiveAutoblock( Block $block, array &$blockIds ) {
 762                 global $wgPutIPinRC;
 763
 764                 // No IPs are in recentchanges table, so nothing to select
 765                 if ( !$wgPutIPinRC ) {
 766                         return;
 767                 }
 768
 769                 // Autoblocks only apply to TYPE_USER
 770                 if ( $block->getType() !== self::TYPE_USER ) {
 771                         return;
 772                 }
 773                 $target = $block->getTarget(); // TYPE_USER => always a User object
 774
 775                 $dbr = wfGetDB( DB_REPLICA );
 776                 $rcQuery = ActorMigration::newMigration()->getWhere( $dbr, 'rc_user', $target, false );
 777
 778                 $options = [ 'ORDER BY' => 'rc_timestamp DESC' ];
 779
 780                 // Just the last IP used.
 781                 $options['LIMIT'] = 1;
 782
 783                 $res = $dbr->select(
 784                         [ 'recentchanges' ] + $rcQuery['tables'],
 785                         [ 'rc_ip' ],
 786                         $rcQuery['conds'],
 787                         __METHOD__,
 788                         $options,
 789                         $rcQuery['joins']
 790                 );
 791
 792                 if ( !$res->numRows() ) {
 793                         # No results, don't autoblock anything
 794                         wfDebug( "No IP found to retroactively autoblock\n" );
 795                 } else {
 796                         foreach ( $res as $row ) {
 797                                 if ( $row->rc_ip ) {
 798                                         $id = $block->doAutoblock( $row->rc_ip );
 799                                         if ( $id ) {
 800                                                 $blockIds[] = $id;
 801                                         }
 802                                 }
 803                         }
 804                 }
 805         }
 806
 807         /**
 808          * Checks whether a given IP is on the autoblock whitelist.
 809          * TODO: this probably belongs somewhere else, but not sure where...
 810          *
 811          * @param string $ip The IP to check
 812          * @return bool
 813          */
 814         public static function isWhitelistedFromAutoblocks( $ip ) {
 815                 // Try to get the autoblock_whitelist from the cache, as it's faster
 816                 // than getting the msg raw and explode()'ing it.
 817                 $cache = MediaWikiServices::getInstance()->getMainWANObjectCache();
 818                 $lines = $cache->getWithSetCallback(
 819                         $cache->makeKey( 'ip-autoblock', 'whitelist' ),
 820                         $cache::TTL_DAY,
 821                         function ( $curValue, &$ttl, array &$setOpts ) {
 822                                 $setOpts += Database::getCacheSetOptions( wfGetDB( DB_REPLICA ) );
 823
 824                                 return explode( "\n",
 825                                         wfMessage( 'autoblock_whitelist' )->inContentLanguage()->plain() );
 826                         }
 827                 );
 828
 829                 wfDebug( "Checking the autoblock whitelist..\n" );
 830
 831                 foreach ( $lines as $line ) {
 832                         # List items only
 833                         if ( substr( $line, 0, 1 ) !== '*' ) {
 834                                 continue;
 835                         }
 836
 837                         $wlEntry = substr( $line, 1 );
 838                         $wlEntry = trim( $wlEntry );
 839
 840                         wfDebug( "Checking $ip against $wlEntry..." );
 841
 842                         # Is the IP in this range?
 843                         if ( IP::isInRange( $ip, $wlEntry ) ) {
 844                                 wfDebug( " IP $ip matches $wlEntry, not autoblocking\n" );
 845                                 return true;
 846                         } else {
 847                                 wfDebug( " No match\n" );
 848                         }
 849                 }
 850
 851                 return false;
 852         }
 853
 854         /**
 855          * Autoblocks the given IP, referring to this Block.
 856          *
 857          * @param string $autoblockIP The IP to autoblock.
 858          * @return int|bool Block ID if an autoblock was inserted, false if not.
 859          */
 860         public function doAutoblock( $autoblockIP ) {
 861                 # If autoblocks are disabled, go away.
 862                 if ( !$this->isAutoblocking() ) {
 863                         return false;
 864                 }
 865
 866                 # Don't autoblock for system blocks
 867                 if ( $this->getSystemBlockType() !== null ) {
 868                         throw new MWException( 'Cannot autoblock from a system block' );
 869                 }
 870
 871                 # Check for presence on the autoblock whitelist.
 872                 if ( self::isWhitelistedFromAutoblocks( $autoblockIP ) ) {
 873                         return false;
 874                 }
 875
 876                 // Avoid PHP 7.1 warning of passing $this by reference
 877                 $block = $this;
 878                 # Allow hooks to cancel the autoblock.
 879                 if ( !Hooks::run( 'AbortAutoblock', [ $autoblockIP, &$block ] ) ) {
 880                         wfDebug( "Autoblock aborted by hook.\n" );
 881                         return false;
 882                 }
 883
 884                 # It's okay to autoblock. Go ahead and insert/update the block...
 885
 886                 # Do not add a *new* block if the IP is already blocked.
 887                 $ipblock = self::newFromTarget( $autoblockIP );
 888                 if ( $ipblock ) {
 889                         # Check if the block is an autoblock and would exceed the user block
 890                         # if renewed. If so, do nothing, otherwise prolong the block time...
 891                         if ( $ipblock->mAuto && // @todo Why not compare $ipblock->mExpiry?
 892                                 $this->mExpiry > self::getAutoblockExpiry( $ipblock->mTimestamp )
 893                         ) {
 894                                 # Reset block timestamp to now and its expiry to
 895                                 # $wgAutoblockExpiry in the future
 896                                 $ipblock->updateTimestamp();
 897                         }
 898                         return false;
 899                 }
 900
 901                 # Make a new block object with the desired properties.
 902                 $autoblock = new Block;
 903                 wfDebug( "Autoblocking {$this->getTarget()}@" . $autoblockIP . "\n" );
 904                 $autoblock->setTarget( $autoblockIP );
 905                 $autoblock->setBlocker( $this->getBlocker() );
 906                 $autoblock->mReason = wfMessage( 'autoblocker', $this->getTarget(), $this->mReason )
 907                         ->inContentLanguage()->plain();
 908                 $timestamp = wfTimestampNow();
 909                 $autoblock->mTimestamp = $timestamp;
 910                 $autoblock->mAuto = 1;
 911                 $autoblock->prevents( 'createaccount', $this->prevents( 'createaccount' ) );
 912                 # Continue suppressing the name if needed
 913                 $autoblock->mHideName = $this->mHideName;
 914                 $autoblock->prevents( 'editownusertalk', $this->prevents( 'editownusertalk' ) );
 915                 $autoblock->mParentBlockId = $this->mId;
 916                 $autoblock->isSitewide( $this->isSitewide() );
 917                 $autoblock->setRestrictions( $this->getRestrictions() );
 918
 919                 if ( $this->mExpiry == 'infinity' ) {
 920                         # Original block was indefinite, start an autoblock now
 921                         $autoblock->mExpiry = self::getAutoblockExpiry( $timestamp );
 922                 } else {
 923                         # If the user is already blocked with an expiry date, we don't
 924                         # want to pile on top of that.
 925                         $autoblock->mExpiry = min( $this->mExpiry, self::getAutoblockExpiry( $timestamp ) );
 926                 }
 927
 928                 # Insert the block...
 929                 $status = $autoblock->insert();
 930                 return $status
 931                         ? $status['id']
 932                         : false;
 933         }
 934
 935         /**
 936          * Check if a block has expired. Delete it if it is.
 937          * @return bool
 938          */
 939         public function deleteIfExpired() {
 940                 if ( $this->isExpired() ) {
 941                         wfDebug( "Block::deleteIfExpired() -- deleting\n" );
 942                         $this->delete();
 943                         $retVal = true;
 944                 } else {
 945                         wfDebug( "Block::deleteIfExpired() -- not expired\n" );
 946                         $retVal = false;
 947                 }
 948
 949                 return $retVal;
 950         }
 951
 952         /**
 953          * Has the block expired?
 954          * @return bool
 955          */
 956         public function isExpired() {
 957                 $timestamp = wfTimestampNow();
 958                 wfDebug( "Block::isExpired() checking current " . $timestamp . " vs $this->mExpiry\n" );
 959
 960                 if ( !$this->mExpiry ) {
 961                         return false;
 962                 } else {
 963                         return $timestamp > $this->mExpiry;
 964                 }
 965         }
 966
 967         /**
 968          * Is the block address valid (i.e. not a null string?)
 969          * @return bool
 970          */
 971         public function isValid() {
 972                 return $this->getTarget() != null;
 973         }
 974
 975         /**
 976          * Update the timestamp on autoblocks.
 977          */
 978         public function updateTimestamp() {
 979                 if ( $this->mAuto ) {
 980                         $this->mTimestamp = wfTimestamp();
 981                         $this->mExpiry = self::getAutoblockExpiry( $this->mTimestamp );
 982
 983                         $dbw = wfGetDB( DB_MASTER );
 984                         $dbw->update( 'ipblocks',
 985                                 [ /* SET */
 986                                         'ipb_timestamp' => $dbw->timestamp( $this->mTimestamp ),
 987                                         'ipb_expiry' => $dbw->timestamp( $this->mExpiry ),
 988                                 ],
 989                                 [ /* WHERE */
 990                                         'ipb_id' => $this->getId(),
 991                                 ],
 992                                 __METHOD__
 993                         );
 994                 }
 995         }
 996
 997         /**
 998          * Get the IP address at the start of the range in Hex form
 999          * @throws MWException
1000          * @return string IP in Hex form
1001          */
1002         public function getRangeStart() {
1003                 switch ( $this->type ) {
1004                         case self::TYPE_USER:
1005                                 return '';
1006                         case self::TYPE_IP:
1007                                 return IP::toHex( $this->target );
1008                         case self::TYPE_RANGE:
1009                                 list( $start, /*...*/ ) = IP::parseRange( $this->target );
1010                                 return $start;
1011                         default:
1012                                 throw new MWException( "Block with invalid type" );
1013                 }
1014         }
1015
1016         /**
1017          * Get the IP address at the end of the range in Hex form
1018          * @throws MWException
1019          * @return string IP in Hex form
1020          */
1021         public function getRangeEnd() {
1022                 switch ( $this->type ) {
1023                         case self::TYPE_USER:
1024                                 return '';
1025                         case self::TYPE_IP:
1026                                 return IP::toHex( $this->target );
1027                         case self::TYPE_RANGE:
1028                                 list( /*...*/, $end ) = IP::parseRange( $this->target );
1029                                 return $end;
1030                         default:
1031                                 throw new MWException( "Block with invalid type" );
1032                 }
1033         }
1034
1035         /**
1036          * Get the user id of the blocking sysop
1037          *
1038          * @return int (0 for foreign users)
1039          */
1040         public function getBy() {
1041                 $blocker = $this->getBlocker();
1042                 return ( $blocker instanceof User )
1043                         ? $blocker->getId()
1044                         : 0;
1045         }
1046
1047         /**
1048          * Get the username of the blocking sysop
1049          *
1050          * @return string
1051          */
1052         public function getByName() {
1053                 $blocker = $this->getBlocker();
1054                 return ( $blocker instanceof User )
1055                         ? $blocker->getName()
1056                         : (string)$blocker; // username
1057         }
1058
1059         /**
1060          * Get the block ID
1061          * @return int
1062          */
1063         public function getId() {
1064                 return $this->mId;
1065         }
1066
1067         /**
1068          * Set the block ID
1069          *
1070          * @param int $blockId
1071          * @return int
1072          */
1073         private function setId( $blockId ) {
1074                 $this->mId = (int)$blockId;
1075
1076                 if ( is_array( $this->restrictions ) ) {
1077                         $this->restrictions = BlockRestriction::setBlockId( $blockId, $this->restrictions );
1078                 }
1079
1080                 return $this;
1081         }
1082
1083         /**
1084          * Get the system block type, if any
1085          * @since 1.29
1086          * @return string|null
1087          */
1088         public function getSystemBlockType() {
1089                 return $this->systemBlockType;
1090         }
1091
1092         /**
1093          * Get/set a flag determining whether the master is used for reads
1094          *
1095          * @param bool|null $x
1096          * @return bool
1097          */
1098         public function fromMaster( $x = null ) {
1099                 return wfSetVar( $this->mFromMaster, $x );
1100         }
1101
1102         /**
1103          * Get/set whether the Block is a hardblock (affects logged-in users on a given IP/range)
1104          * @param bool|null $x
1105          * @return bool
1106          */
1107         public function isHardblock( $x = null ) {
1108                 wfSetVar( $this->isHardblock, $x );
1109
1110                 # You can't *not* hardblock a user
1111                 return $this->getType() == self::TYPE_USER
1112                         ? true
1113                         : $this->isHardblock;
1114         }
1115
1116         /**
1117          * @param null|bool $x
1118          * @return bool
1119          */
1120         public function isAutoblocking( $x = null ) {
1121                 wfSetVar( $this->isAutoblocking, $x );
1122
1123                 # You can't put an autoblock on an IP or range as we don't have any history to
1124                 # look over to get more IPs from
1125                 return $this->getType() == self::TYPE_USER
1126                         ? $this->isAutoblocking
1127                         : false;
1128         }
1129
1130         /**
1131          * Indicates that the block is a sitewide block. This means the user is
1132          * prohibited from editing any page on the site (other than their own talk
1133          * page).
1134          *
1135          * @param null|bool $x
1136          * @return bool
1137          */
1138         public function isSitewide( $x = null ) {
1139                 return wfSetVar( $this->isSitewide, $x );
1140         }
1141
1142         /**
1143          * Get/set whether the Block prevents a given action
1144          *
1145          * @param string $action Action to check
1146          * @param bool|null $x Value for set, or null to just get value
1147          * @return bool|null Null for unrecognized rights.
1148          */
1149         public function prevents( $action, $x = null ) {
1150                 $config = RequestContext::getMain()->getConfig();
1151                 $blockDisablesLogin = $config->get( 'BlockDisablesLogin' );
1152                 $blockAllowsUTEdit = $config->get( 'BlockAllowsUTEdit' );
1153
1154                 $res = null;
1155                 switch ( $action ) {
1156                         case 'edit':
1157                                 # For now... <evil laugh>
1158                                 $res = true;
1159                                 break;
1160                         case 'createaccount':
1161                                 $res = wfSetVar( $this->mCreateAccount, $x );
1162                                 break;
1163                         case 'sendemail':
1164                                 $res = wfSetVar( $this->mBlockEmail, $x );
1165                                 break;
1166                         case 'upload':
1167                                 // Until T6995 is completed
1168                                 $res = $this->isSitewide();
1169                                 break;
1170                         case 'editownusertalk':
1171                                 // NOTE: this check is not reliable on partial blocks
1172                                 // since partially blocked users are always allowed to edit
1173                                 // their own talk page unless a restriction exists on the
1174                                 // page or User_talk: namespace
1175                                 $res = wfSetVar( $this->mDisableUsertalk, $x );
1176
1177                                 // edit own user talk can be disabled by config
1178                                 if ( !$blockAllowsUTEdit ) {
1179                                         $res = true;
1180                                 }
1181                                 break;
1182                         case 'read':
1183                                 $res = false;
1184                                 break;
1185                 }
1186                 if ( !$res && $blockDisablesLogin ) {
1187                         // If a block would disable login, then it should
1188                         // prevent any action that all users cannot do
1189                         $anon = new User;
1190                         $res = $anon->isAllowed( $action ) ? $res : true;
1191                 }
1192
1193                 return $res;
1194         }
1195
1196         /**
1197          * Get the block name, but with autoblocked IPs hidden as per standard privacy policy
1198          * @return string Text is escaped
1199          */
1200         public function getRedactedName() {
1201                 if ( $this->mAuto ) {
1202                         return Html::rawElement(
1203                                 'span',
1204                                 [ 'class' => 'mw-autoblockid' ],
1205                                 wfMessage( 'autoblockid', $this->mId )
1206                         );
1207                 } else {
1208                         return htmlspecialchars( $this->getTarget() );
1209                 }
1210         }
1211
1212         /**
1213          * Get a timestamp of the expiry for autoblocks
1214          *
1215          * @param string|int $timestamp
1216          * @return string
1217          */
1218         public static function getAutoblockExpiry( $timestamp ) {
1219                 global $wgAutoblockExpiry;
1220
1221                 return wfTimestamp( TS_MW, wfTimestamp( TS_UNIX, $timestamp ) + $wgAutoblockExpiry );
1222         }
1223
1224         /**
1225          * Purge expired blocks from the ipblocks table
1226          */
1227         public static function purgeExpired() {
1228                 if ( wfReadOnly() ) {
1229                         return;
1230                 }
1231
1232                 DeferredUpdates::addUpdate( new AutoCommitUpdate(
1233                         wfGetDB( DB_MASTER ),
1234                         __METHOD__,
1235                         function ( IDatabase $dbw, $fname ) {
1236                                 $ids = $dbw->selectFieldValues( 'ipblocks',
1237                                         'ipb_id',
1238                                         [ 'ipb_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ],
1239                                         $fname
1240                                 );
1241                                 if ( $ids ) {
1242                                         BlockRestriction::deleteByBlockId( $ids );
1243                                         $dbw->delete( 'ipblocks', [ 'ipb_id' => $ids ], $fname );
1244                                 }
1245                         }
1246                 ) );
1247         }
1248
1249         /**
1250          * Given a target and the target's type, get an existing Block object if possible.
1251          * @param string|User|int $specificTarget A block target, which may be one of several types:
1252          *     * A user to block, in which case $target will be a User
1253          *     * An IP to block, in which case $target will be a User generated by using
1254          *       User::newFromName( $ip, false ) to turn off name validation
1255          *     * An IP range, in which case $target will be a String "123.123.123.123/18" etc
1256          *     * The ID of an existing block, in the format "#12345" (since pure numbers are valid
1257          *       usernames
1258          *     Calling this with a user, IP address or range will not select autoblocks, and will
1259          *     only select a block where the targets match exactly (so looking for blocks on
1260          *     1.2.3.4 will not select 1.2.0.0/16 or even 1.2.3.4/32)
1261          * @param string|User|int|null $vagueTarget As above, but we will search for *any* block which
1262          *     affects that target (so for an IP address, get ranges containing that IP; and also
1263          *     get any relevant autoblocks). Leave empty or blank to skip IP-based lookups.
1264          * @param bool $fromMaster Whether to use the DB_MASTER database
1265          * @return Block|null (null if no relevant block could be found).  The target and type
1266          *     of the returned Block will refer to the actual block which was found, which might
1267          *     not be the same as the target you gave if you used $vagueTarget!
1268          */
1269         public static function newFromTarget( $specificTarget, $vagueTarget = null, $fromMaster = false ) {
1270                 list( $target, $type ) = self::parseTarget( $specificTarget );
1271                 if ( $type == self::TYPE_ID || $type == self::TYPE_AUTO ) {
1272                         return self::newFromID( $target );
1273
1274                 } elseif ( $target === null && $vagueTarget == '' ) {
1275                         # We're not going to find anything useful here
1276                         # Be aware that the == '' check is explicit, since empty values will be
1277                         # passed by some callers (T31116)
1278                         return null;
1279
1280                 } elseif ( in_array(
1281                         $type,
1282                         [ self::TYPE_USER, self::TYPE_IP, self::TYPE_RANGE, null ] )
1283                 ) {
1284                         $block = new Block();
1285                         $block->fromMaster( $fromMaster );
1286
1287                         if ( $type !== null ) {
1288                                 $block->setTarget( $target );
1289                         }
1290
1291                         if ( $block->newLoad( $vagueTarget ) ) {
1292                                 return $block;
1293                         }
1294                 }
1295                 return null;
1296         }
1297
1298         /**
1299          * Get all blocks that match any IP from an array of IP addresses
1300          *
1301          * @param array $ipChain List of IPs (strings), usually retrieved from the
1302          *     X-Forwarded-For header of the request
1303          * @param bool $isAnon Exclude anonymous-only blocks if false
1304          * @param bool $fromMaster Whether to query the master or replica DB
1305          * @return array Array of Blocks
1306          * @since 1.22
1307          */
1308         public static function getBlocksForIPList( array $ipChain, $isAnon, $fromMaster = false ) {
1309                 if ( !count( $ipChain ) ) {
1310                         return [];
1311                 }
1312
1313                 $conds = [];
1314                 $proxyLookup = MediaWikiServices::getInstance()->getProxyLookup();
1315                 foreach ( array_unique( $ipChain ) as $ipaddr ) {
1316                         # Discard invalid IP addresses. Since XFF can be spoofed and we do not
1317                         # necessarily trust the header given to us, make sure that we are only
1318                         # checking for blocks on well-formatted IP addresses (IPv4 and IPv6).
1319                         # Do not treat private IP spaces as special as it may be desirable for wikis
1320                         # to block those IP ranges in order to stop misbehaving proxies that spoof XFF.
1321                         if ( !IP::isValid( $ipaddr ) ) {
1322                                 continue;
1323                         }
1324                         # Don't check trusted IPs (includes local squids which will be in every request)
1325                         if ( $proxyLookup->isTrustedProxy( $ipaddr ) ) {
1326                                 continue;
1327                         }
1328                         # Check both the original IP (to check against single blocks), as well as build
1329                         # the clause to check for rangeblocks for the given IP.
1330                         $conds['ipb_address'][] = $ipaddr;
1331                         $conds[] = self::getRangeCond( IP::toHex( $ipaddr ) );
1332                 }
1333
1334                 if ( !count( $conds ) ) {
1335                         return [];
1336                 }
1337
1338                 if ( $fromMaster ) {
1339                         $db = wfGetDB( DB_MASTER );
1340                 } else {
1341                         $db = wfGetDB( DB_REPLICA );
1342                 }
1343                 $conds = $db->makeList( $conds, LIST_OR );
1344                 if ( !$isAnon ) {
1345                         $conds = [ $conds, 'ipb_anon_only' => 0 ];
1346                 }
1347                 $blockQuery = self::getQueryInfo();
1348                 $rows = $db->select(
1349                         $blockQuery['tables'],
1350                         array_merge( [ 'ipb_range_start', 'ipb_range_end' ], $blockQuery['fields'] ),
1351                         $conds,
1352                         __METHOD__,
1353                         [],
1354                         $blockQuery['joins']
1355                 );
1356
1357                 $blocks = [];
1358                 foreach ( $rows as $row ) {
1359                         $block = self::newFromRow( $row );
1360                         if ( !$block->isExpired() ) {
1361                                 $blocks[] = $block;
1362                         }
1363                 }
1364
1365                 return $blocks;
1366         }
1367
1368         /**
1369          * From a list of multiple blocks, find the most exact and strongest Block.
1370          *
1371          * The logic for finding the "best" block is:
1372          *  - Blocks that match the block's target IP are preferred over ones in a range
1373          *  - Hardblocks are chosen over softblocks that prevent account creation
1374          *  - Softblocks that prevent account creation are chosen over other softblocks
1375          *  - Other softblocks are chosen over autoblocks
1376          *  - If there are multiple exact or range blocks at the same level, the one chosen
1377          *    is random
1378          * This should be used when $blocks where retrieved from the user's IP address
1379          * and $ipChain is populated from the same IP address information.
1380          *
1381          * @param array $blocks Array of Block objects
1382          * @param array $ipChain List of IPs (strings). This is used to determine how "close"
1383          *     a block is to the server, and if a block matches exactly, or is in a range.
1384          *     The order is furthest from the server to nearest e.g., (Browser, proxy1, proxy2,
1385          *     local-squid, ...)
1386          * @throws MWException
1387          * @return Block|null The "best" block from the list
1388          */
1389         public static function chooseBlock( array $blocks, array $ipChain ) {
1390                 if ( !count( $blocks ) ) {
1391                         return null;
1392                 } elseif ( count( $blocks ) == 1 ) {
1393                         return $blocks[0];
1394                 }
1395
1396                 // Sort hard blocks before soft ones and secondarily sort blocks
1397                 // that disable account creation before those that don't.
1398                 usort( $blocks, function ( Block $a, Block $b ) {
1399                         $aWeight = (int)$a->isHardblock() . (int)$a->prevents( 'createaccount' );
1400                         $bWeight = (int)$b->isHardblock() . (int)$b->prevents( 'createaccount' );
1401                         return strcmp( $bWeight, $aWeight ); // highest weight first
1402                 } );
1403
1404                 $blocksListExact = [
1405                         'hard' => false,
1406                         'disable_create' => false,
1407                         'other' => false,
1408                         'auto' => false
1409                 ];
1410                 $blocksListRange = [
1411                         'hard' => false,
1412                         'disable_create' => false,
1413                         'other' => false,
1414                         'auto' => false
1415                 ];
1416                 $ipChain = array_reverse( $ipChain );
1417
1418                 /** @var Block $block */
1419                 foreach ( $blocks as $block ) {
1420                         // Stop searching if we have already have a "better" block. This
1421                         // is why the order of the blocks matters
1422                         if ( !$block->isHardblock() && $blocksListExact['hard'] ) {
1423                                 break;
1424                         } elseif ( !$block->prevents( 'createaccount' ) && $blocksListExact['disable_create'] ) {
1425                                 break;
1426                         }
1427
1428                         foreach ( $ipChain as $checkip ) {
1429                                 $checkipHex = IP::toHex( $checkip );
1430                                 if ( (string)$block->getTarget() === $checkip ) {
1431                                         if ( $block->isHardblock() ) {
1432                                                 $blocksListExact['hard'] = $blocksListExact['hard'] ?: $block;
1433                                         } elseif ( $block->prevents( 'createaccount' ) ) {
1434                                                 $blocksListExact['disable_create'] = $blocksListExact['disable_create'] ?: $block;
1435                                         } elseif ( $block->mAuto ) {
1436                                                 $blocksListExact['auto'] = $blocksListExact['auto'] ?: $block;
1437                                         } else {
1438                                                 $blocksListExact['other'] = $blocksListExact['other'] ?: $block;
1439                                         }
1440                                         // We found closest exact match in the ip list, so go to the next Block
1441                                         break;
1442                                 } elseif ( array_filter( $blocksListExact ) == []
1443                                         && $block->getRangeStart() <= $checkipHex
1444                                         && $block->getRangeEnd() >= $checkipHex
1445                                 ) {
1446                                         if ( $block->isHardblock() ) {
1447                                                 $blocksListRange['hard'] = $blocksListRange['hard'] ?: $block;
1448                                         } elseif ( $block->prevents( 'createaccount' ) ) {
1449                                                 $blocksListRange['disable_create'] = $blocksListRange['disable_create'] ?: $block;
1450                                         } elseif ( $block->mAuto ) {
1451                                                 $blocksListRange['auto'] = $blocksListRange['auto'] ?: $block;
1452                                         } else {
1453                                                 $blocksListRange['other'] = $blocksListRange['other'] ?: $block;
1454                                         }
1455                                         break;
1456                                 }
1457                         }
1458                 }
1459
1460                 if ( array_filter( $blocksListExact ) == [] ) {
1461                         $blocksList = &$blocksListRange;
1462                 } else {
1463                         $blocksList = &$blocksListExact;
1464                 }
1465
1466                 $chosenBlock = null;
1467                 if ( $blocksList['hard'] ) {
1468                         $chosenBlock = $blocksList['hard'];
1469                 } elseif ( $blocksList['disable_create'] ) {
1470                         $chosenBlock = $blocksList['disable_create'];
1471                 } elseif ( $blocksList['other'] ) {
1472                         $chosenBlock = $blocksList['other'];
1473                 } elseif ( $blocksList['auto'] ) {
1474                         $chosenBlock = $blocksList['auto'];
1475                 } else {
1476                         throw new MWException( "Proxy block found, but couldn't be classified." );
1477                 }
1478
1479                 return $chosenBlock;
1480         }
1481
1482         /**
1483          * From an existing Block, get the target and the type of target.
1484          * Note that, except for null, it is always safe to treat the target
1485          * as a string; for User objects this will return User::__toString()
1486          * which in turn gives User::getName().
1487          *
1488          * @param string|int|User|null $target
1489          * @return array [ User|String|null, Block::TYPE_ constant|null ]
1490          */
1491         public static function parseTarget( $target ) {
1492                 # We may have been through this before
1493                 if ( $target instanceof User ) {
1494                         if ( IP::isValid( $target->getName() ) ) {
1495                                 return [ $target, self::TYPE_IP ];
1496                         } else {
1497                                 return [ $target, self::TYPE_USER ];
1498                         }
1499                 } elseif ( $target === null ) {
1500                         return [ null, null ];
1501                 }
1502
1503                 $target = trim( $target );
1504
1505                 if ( IP::isValid( $target ) ) {
1506                         # We can still create a User if it's an IP address, but we need to turn
1507                         # off validation checking (which would exclude IP addresses)
1508                         return [
1509                                 User::newFromName( IP::sanitizeIP( $target ), false ),
1510                                 self::TYPE_IP
1511                         ];
1512
1513                 } elseif ( IP::isValidRange( $target ) ) {
1514                         # Can't create a User from an IP range
1515                         return [ IP::sanitizeRange( $target ), self::TYPE_RANGE ];
1516                 }
1517
1518                 # Consider the possibility that this is not a username at all
1519                 # but actually an old subpage (T31797)
1520                 if ( strpos( $target, '/' ) !== false ) {
1521                         # An old subpage, drill down to the user behind it
1522                         $target = explode( '/', $target )[0];
1523                 }
1524
1525                 $userObj = User::newFromName( $target );
1526                 if ( $userObj instanceof User ) {
1527                         # Note that since numbers are valid usernames, a $target of "12345" will be
1528                         # considered a User.  If you want to pass a block ID, prepend a hash "#12345",
1529                         # since hash characters are not valid in usernames or titles generally.
1530                         return [ $userObj, self::TYPE_USER ];
1531
1532                 } elseif ( preg_match( '/^#\d+$/', $target ) ) {
1533                         # Autoblock reference in the form "#12345"
1534                         return [ substr( $target, 1 ), self::TYPE_AUTO ];
1535
1536                 } else {
1537                         # WTF?
1538                         return [ null, null ];
1539                 }
1540         }
1541
1542         /**
1543          * Get the type of target for this particular block
1544          * @return int Block::TYPE_ constant, will never be TYPE_ID
1545          */
1546         public function getType() {
1547                 return $this->mAuto
1548                         ? self::TYPE_AUTO
1549                         : $this->type;
1550         }
1551
1552         /**
1553          * Get the target and target type for this particular Block.  Note that for autoblocks,
1554          * this returns the unredacted name; frontend functions need to call $block->getRedactedName()
1555          * in this situation.
1556          * @return array [ User|String, Block::TYPE_ constant ]
1557          * @todo FIXME: This should be an integral part of the Block member variables
1558          */
1559         public function getTargetAndType() {
1560                 return [ $this->getTarget(), $this->getType() ];
1561         }
1562
1563         /**
1564          * Get the target for this particular Block.  Note that for autoblocks,
1565          * this returns the unredacted name; frontend functions need to call $block->getRedactedName()
1566          * in this situation.
1567          * @return User|string
1568          */
1569         public function getTarget() {
1570                 return $this->target;
1571         }
1572
1573         /**
1574          * @since 1.19
1575          *
1576          * @return mixed|string
1577          */
1578         public function getExpiry() {
1579                 return $this->mExpiry;
1580         }
1581
1582         /**
1583          * Set the target for this block, and update $this->type accordingly
1584          * @param mixed $target
1585          */
1586         public function setTarget( $target ) {
1587                 list( $this->target, $this->type ) = self::parseTarget( $target );
1588         }
1589
1590         /**
1591          * Get the user who implemented this block
1592          * @return User User object. May name a foreign user.
1593          */
1594         public function getBlocker() {
1595                 return $this->blocker;
1596         }
1597
1598         /**
1599          * Set the user who implemented (or will implement) this block
1600          * @param User|string $user Local User object or username string
1601          */
1602         public function setBlocker( $user ) {
1603                 if ( is_string( $user ) ) {
1604                         $user = User::newFromName( $user, false );
1605                 }
1606
1607                 if ( $user->isAnon() && User::isUsableName( $user->getName() ) ) {
1608                         throw new InvalidArgumentException(
1609                                 'Blocker must be a local user or a name that cannot be a local user'
1610                         );
1611                 }
1612
1613                 $this->blocker = $user;
1614         }
1615
1616         /**
1617          * Set the 'BlockID' cookie to this block's ID and expiry time. The cookie's expiry will be
1618          * the same as the block's, to a maximum of 24 hours.
1619          *
1620          * @since 1.29
1621          *
1622          * @param WebResponse $response The response on which to set the cookie.
1623          */
1624         public function setCookie( WebResponse $response ) {
1625                 // Calculate the default expiry time.
1626                 $maxExpiryTime = wfTimestamp( TS_MW, wfTimestamp() + ( 24 * 60 * 60 ) );
1627
1628                 // Use the Block's expiry time only if it's less than the default.
1629                 $expiryTime = $this->getExpiry();
1630                 if ( $expiryTime === 'infinity' || $expiryTime > $maxExpiryTime ) {
1631                         $expiryTime = $maxExpiryTime;
1632                 }
1633
1634                 // Set the cookie. Reformat the MediaWiki datetime as a Unix timestamp for the cookie.
1635                 $expiryValue = DateTime::createFromFormat( 'YmdHis', $expiryTime )->format( 'U' );
1636                 $cookieOptions = [ 'httpOnly' => false ];
1637                 $cookieValue = $this->getCookieValue();
1638                 $response->setCookie( 'BlockID', $cookieValue, $expiryValue, $cookieOptions );
1639         }
1640
1641         /**
1642          * Unset the 'BlockID' cookie.
1643          *
1644          * @since 1.29
1645          *
1646          * @param WebResponse $response The response on which to unset the cookie.
1647          */
1648         public static function clearCookie( WebResponse $response ) {
1649                 $response->clearCookie( 'BlockID', [ 'httpOnly' => false ] );
1650         }
1651
1652         /**
1653          * Get the BlockID cookie's value for this block. This is usually the block ID concatenated
1654          * with an HMAC in order to avoid spoofing (T152951), but if wgSecretKey is not set will just
1655          * be the block ID.
1656          *
1657          * @since 1.29
1658          *
1659          * @return string The block ID, probably concatenated with "!" and the HMAC.
1660          */
1661         public function getCookieValue() {
1662                 $config = RequestContext::getMain()->getConfig();
1663                 $id = $this->getId();
1664                 $secretKey = $config->get( 'SecretKey' );
1665                 if ( !$secretKey ) {
1666                         // If there's no secret key, don't append a HMAC.
1667                         return $id;
1668                 }
1669                 $hmac = MWCryptHash::hmac( $id, $secretKey, false );
1670                 $cookieValue = $id . '!' . $hmac;
1671                 return $cookieValue;
1672         }
1673
1674         /**
1675          * Get the stored ID from the 'BlockID' cookie. The cookie's value is usually a combination of
1676          * the ID and a HMAC (see Block::setCookie), but will sometimes only be the ID.
1677          *
1678          * @since 1.29
1679          *
1680          * @param string $cookieValue The string in which to find the ID.
1681          *
1682          * @return int|null The block ID, or null if the HMAC is present and invalid.
1683          */
1684         public static function getIdFromCookieValue( $cookieValue ) {
1685                 // Extract the ID prefix from the cookie value (may be the whole value, if no bang found).
1686                 $bangPos = strpos( $cookieValue, '!' );
1687                 $id = ( $bangPos === false ) ? $cookieValue : substr( $cookieValue, 0, $bangPos );
1688                 // Get the site-wide secret key.
1689                 $config = RequestContext::getMain()->getConfig();
1690                 $secretKey = $config->get( 'SecretKey' );
1691                 if ( !$secretKey ) {
1692                         // If there's no secret key, just use the ID as given.
1693                         return $id;
1694                 }
1695                 $storedHmac = substr( $cookieValue, $bangPos + 1 );
1696                 $calculatedHmac = MWCryptHash::hmac( $id, $secretKey, false );
1697                 if ( $calculatedHmac === $storedHmac ) {
1698                         return $id;
1699                 } else {
1700                         return null;
1701                 }
1702         }
1703
1704         /**
1705          * Get the key and parameters for the corresponding error message.
1706          *
1707          * @since 1.22
1708          * @param IContextSource $context
1709          * @return array
1710          */
1711         public function getPermissionsError( IContextSource $context ) {
1712                 $params = $this->getBlockErrorParams( $context );
1713
1714                 $msg = 'blockedtext';
1715                 if ( $this->getSystemBlockType() !== null ) {
1716                         $msg = 'systemblockedtext';
1717                 } elseif ( $this->mAuto ) {
1718                         $msg = 'autoblockedtext';
1719                 } elseif ( !$this->isSitewide() ) {
1720                         $msg = 'blockedtext-partial';
1721                 }
1722
1723                 array_unshift( $params, $msg );
1724
1725                 return $params;
1726         }
1727
1728         /**
1729          * Get block information used in different block error messages
1730          *
1731          * @param IContextSource $context
1732          * @return array
1733          */
1734         public function getBlockErrorParams( IContextSource $context ) {
1735                 $blocker = $this->getBlocker();
1736                 if ( $blocker instanceof User ) { // local user
1737                         $blockerUserpage = $blocker->getUserPage();
1738                         $link = "[[{$blockerUserpage->getPrefixedText()}|{$blockerUserpage->getText()}]]";
1739                 } else { // foreign user
1740                         $link = $blocker;
1741                 }
1742
1743                 $reason = $this->mReason;
1744                 if ( $reason == '' ) {
1745                         $reason = $context->msg( 'blockednoreason' )->text();
1746                 }
1747
1748                 /* $ip returns who *is* being blocked, $intended contains who was meant to be blocked.
1749                  * This could be a username, an IP range, or a single IP. */
1750                 $intended = $this->getTarget();
1751                 $systemBlockType = $this->getSystemBlockType();
1752                 $lang = $context->getLanguage();
1753
1754                 return [
1755                         $link,
1756                         $reason,
1757                         $context->getRequest()->getIP(),
1758                         $this->getByName(),
1759                         $systemBlockType ?? $this->getId(),
1760                         $lang->formatExpiry( $this->mExpiry ),
1761                         (string)$intended,
1762                         $lang->userTimeAndDate( $this->mTimestamp, $context->getUser() ),
1763                 ];
1764         }
1765
1766         /**
1767          * Get Restrictions.
1768          *
1769          * Getting the restrictions will perform a database query if the restrictions
1770          * are not already loaded.
1771          *
1772          * @return Restriction[]
1773          */
1774         public function getRestrictions() {
1775                 if ( $this->restrictions === null ) {
1776                         // If the block id has not been set, then do not attempt to load the
1777                         // restrictions.
1778                         if ( !$this->mId ) {
1779                                 return [];
1780                         }
1781                         $this->restrictions = BlockRestriction::loadByBlockId( $this->mId );
1782                 }
1783
1784                 return $this->restrictions;
1785         }
1786
1787         /**
1788          * Set Restrictions.
1789          *
1790          * @param Restriction[] $restrictions
1791          *
1792          * @return self
1793          */
1794         public function setRestrictions( array $restrictions ) {
1795                 $this->restrictions = array_filter( $restrictions, function ( $restriction ) {
1796                         return $restriction instanceof Restriction;
1797                 } );
1798
1799                 return $this;
1800         }
1801
1802         /**
1803          * Checks if a block applies to a particular title
1804          *
1805          * This check does not consider whether `$this->prevents( 'editownusertalk' )`
1806          * returns false, as the identity of the user making the hypothetical edit
1807          * isn't known here (particularly in the case of IP hardblocks, range
1808          * blocks, and auto-blocks).
1809          *
1810          * @param Title $title
1811          * @return bool
1812          */
1813         public function appliesToTitle( Title $title ) {
1814                 if ( $this->isSitewide() ) {
1815                         return true;
1816                 }
1817
1818                 $restrictions = $this->getRestrictions();
1819                 foreach ( $restrictions as $restriction ) {
1820                         if ( $restriction->matches( $title ) ) {
1821                                 return true;
1822                         }
1823                 }
1824
1825                 return false;
1826         }
1827 }