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\Block\Restriction\NamespaceRestriction;
  28 use MediaWiki\Block\Restriction\PageRestriction;
  29 use MediaWiki\MediaWikiServices;
  30
  31 class Block {
  32         /** @var string */
  33         public $mReason;
  34
  35         /** @var string */
  36         public $mTimestamp;
  37
  38         /** @var bool */
  39         public $mAuto;
  40
  41         /** @var string */
  42         public $mExpiry;
  43
  44         /** @var bool */
  45         public $mHideName;
  46
  47         /** @var int */
  48         public $mParentBlockId;
  49
  50         /** @var int */
  51         private $mId;
  52
  53         /** @var bool */
  54         private $mFromMaster;
  55
  56         /** @var bool */
  57         private $mBlockEmail;
  58
  59         /** @var bool */
  60         private $mDisableUsertalk;
  61
  62         /** @var bool */
  63         private $mCreateAccount;
  64
  65         /** @var User|string */
  66         private $target;
  67
  68         /** @var int Hack for foreign blocking (CentralAuth) */
  69         private $forcedTargetID;
  70
  71         /** @var int Block::TYPE_ constant. Can only be USER, IP or RANGE internally */
  72         private $type;
  73
  74         /** @var User */
  75         private $blocker;
  76
  77         /** @var bool */
  78         private $isHardblock;
  79
  80         /** @var bool */
  81         private $isAutoblocking;
  82
  83         /** @var string|null */
  84         private $systemBlockType;
  85
  86         /** @var bool */
  87         private $isSitewide;
  88
  89         /** @var Restriction[] */
  90         private $restrictions;
  91
  92         # TYPE constants
  93         const TYPE_USER = 1;
  94         const TYPE_IP = 2;
  95         const TYPE_RANGE = 3;
  96         const TYPE_AUTO = 4;
  97         const TYPE_ID = 5;
  98
  99         /**
 100          * Create a new block with specified parameters on a user, IP or IP range.
 101          *
 102          * @param array $options Parameters of the block:
 103          *     address string|User  Target user name, User object, IP address or IP range
 104          *     user int             Override target user ID (for foreign users)
 105          *     by int               User ID of the blocker
 106          *     reason string        Reason of the block
 107          *     timestamp string     The time at which the block comes into effect
 108          *     auto bool            Is this an automatic block?
 109          *     expiry string        Timestamp of expiration of the block or 'infinity'
 110          *     anonOnly bool        Only disallow anonymous actions
 111          *     createAccount bool   Disallow creation of new accounts
 112          *     enableAutoblock bool Enable automatic blocking
 113          *     hideName bool        Hide the target user name
 114          *     blockEmail bool      Disallow sending emails
 115          *     allowUsertalk bool   Allow the target to edit its own talk page
 116          *     byText string        Username of the blocker (for foreign users)
 117          *     systemBlock string   Indicate that this block is automatically
 118          *                          created by MediaWiki rather than being stored
 119          *                          in the database. Value is a string to return
 120          *                          from self::getSystemBlockType().
 121          *
 122          * @since 1.26 accepts $options array instead of individual parameters; order
 123          * of parameters above reflects the original order
 124          */
 125         function __construct( $options = [] ) {
 126                 $defaults = [
 127                         'address'         => '',
 128                         'user'            => null,
 129                         'by'              => null,
 130                         'reason'          => '',
 131                         'timestamp'       => '',
 132                         'auto'            => false,
 133                         'expiry'          => '',
 134                         'anonOnly'        => false,
 135                         'createAccount'   => false,
 136                         'enableAutoblock' => false,
 137                         'hideName'        => false,
 138                         'blockEmail'      => false,
 139                         'allowUsertalk'   => false,
 140                         'byText'          => '',
 141                         'systemBlock'     => null,
 142                         'sitewide'        => true,
 143                 ];
 144
 145                 if ( func_num_args() > 1 || !is_array( $options ) ) {
 146                         $options = array_combine(
 147                                 array_slice( array_keys( $defaults ), 0, func_num_args() ),
 148                                 func_get_args()
 149                         );
 150                         wfDeprecated( __METHOD__ . ' with multiple arguments', '1.26' );
 151                 }
 152
 153                 $options += $defaults;
 154
 155                 $this->setTarget( $options['address'] );
 156
 157                 if ( $this->target instanceof User && $options['user'] ) {
 158                         # Needed for foreign users
 159                         $this->forcedTargetID = $options['user'];
 160                 }
 161
 162                 if ( $options['by'] ) {
 163                         # Local user
 164                         $this->setBlocker( User::newFromId( $options['by'] ) );
 165                 } else {
 166                         # Foreign user
 167                         $this->setBlocker( $options['byText'] );
 168                 }
 169
 170                 $this->mReason = $options['reason'];
 171                 $this->mTimestamp = wfTimestamp( TS_MW, $options['timestamp'] );
 172                 $this->mExpiry = wfGetDB( DB_REPLICA )->decodeExpiry( $options['expiry'] );
 173
 174                 # Boolean settings
 175                 $this->mAuto = (bool)$options['auto'];
 176                 $this->mHideName = (bool)$options['hideName'];
 177                 $this->isHardblock( !$options['anonOnly'] );
 178                 $this->isAutoblocking( (bool)$options['enableAutoblock'] );
 179                 $this->isSitewide( (bool)$options['sitewide'] );
 180
 181                 # Prevention measures
 182                 $this->prevents( 'sendemail', (bool)$options['blockEmail'] );
 183                 $this->prevents( 'editownusertalk', !$options['allowUsertalk'] );
 184                 $this->prevents( 'createaccount', (bool)$options['createAccount'] );
 185
 186                 $this->mFromMaster = false;
 187                 $this->systemBlockType = $options['systemBlock'];
 188         }
 189
 190         /**
 191          * Load a blocked user from their block id.
 192          *
 193          * @param int $id Block id to search for
 194          * @return Block|null
 195          */
 196         public static function newFromID( $id ) {
 197                 $dbr = wfGetDB( DB_REPLICA );
 198                 $blockQuery = self::getQueryInfo();
 199                 $res = $dbr->selectRow(
 200                         $blockQuery['tables'],
 201                         $blockQuery['fields'],
 202                         [ 'ipb_id' => $id ],
 203                         __METHOD__,
 204                         [],
 205                         $blockQuery['joins']
 206                 );
 207                 if ( $res ) {
 208                         return self::newFromRow( $res );
 209                 } else {
 210                         return null;
 211                 }
 212         }
 213
 214         /**
 215          * Return the list of ipblocks fields that should be selected to create
 216          * a new block.
 217          * @deprecated since 1.31, use self::getQueryInfo() instead.
 218          * @return array
 219          */
 220         public static function selectFields() {
 221                 global $wgActorTableSchemaMigrationStage;
 222
 223                 if ( $wgActorTableSchemaMigrationStage & SCHEMA_COMPAT_READ_NEW ) {
 224                         // If code is using this instead of self::getQueryInfo(), there's a
 225                         // decent chance it's going to try to directly access
 226                         // $row->ipb_by or $row->ipb_by_text and we can't give it
 227                         // useful values here once those aren't being used anymore.
 228                         throw new BadMethodCallException(
 229                                 'Cannot use ' . __METHOD__
 230                                         . ' when $wgActorTableSchemaMigrationStage has SCHEMA_COMPAT_READ_NEW'
 231                         );
 232                 }
 233
 234                 wfDeprecated( __METHOD__, '1.31' );
 235                 return [
 236                         'ipb_id',
 237                         'ipb_address',
 238                         'ipb_by',
 239                         'ipb_by_text',
 240                         'ipb_by_actor' => 'NULL',
 241                         'ipb_timestamp',
 242                         'ipb_auto',
 243                         'ipb_anon_only',
 244                         'ipb_create_account',
 245                         'ipb_enable_autoblock',
 246                         'ipb_expiry',
 247                         'ipb_deleted',
 248                         'ipb_block_email',
 249                         'ipb_allow_usertalk',
 250                         'ipb_parent_block_id',
 251                         'ipb_sitewide',
 252                 ] + CommentStore::getStore()->getFields( 'ipb_reason' );
 253         }
 254
 255         /**
 256          * Return the tables, fields, and join conditions to be selected to create
 257          * a new block object.
 258          * @since 1.31
 259          * @return array With three keys:
 260          *   - tables: (string[]) to include in the `$table` to `IDatabase->select()`
 261          *   - fields: (string[]) to include in the `$vars` to `IDatabase->select()`
 262          *   - joins: (array) to include in the `$join_conds` to `IDatabase->select()`
 263          */
 264         public static function getQueryInfo() {
 265                 $commentQuery = CommentStore::getStore()->getJoin( 'ipb_reason' );
 266                 $actorQuery = ActorMigration::newMigration()->getJoin( 'ipb_by' );
 267                 return [
 268                         'tables' => [ 'ipblocks' ] + $commentQuery['tables'] + $actorQuery['tables'],
 269                         'fields' => [
 270                                 'ipb_id',
 271                                 'ipb_address',
 272                                 'ipb_timestamp',
 273                                 'ipb_auto',
 274                                 'ipb_anon_only',
 275                                 'ipb_create_account',
 276                                 'ipb_enable_autoblock',
 277                                 'ipb_expiry',
 278                                 'ipb_deleted',
 279                                 'ipb_block_email',
 280                                 'ipb_allow_usertalk',
 281                                 'ipb_parent_block_id',
 282                                 'ipb_sitewide',
 283                         ] + $commentQuery['fields'] + $actorQuery['fields'],
 284                         'joins' => $commentQuery['joins'] + $actorQuery['joins'],
 285                 ];
 286         }
 287
 288         /**
 289          * Check if two blocks are effectively equal.  Doesn't check irrelevant things like
 290          * the blocking user or the block timestamp, only things which affect the blocked user
 291          *
 292          * @param Block $block
 293          *
 294          * @return bool
 295          */
 296         public function equals( Block $block ) {
 297                 return (
 298                         (string)$this->target == (string)$block->target
 299                         && $this->type == $block->type
 300                         && $this->mAuto == $block->mAuto
 301                         && $this->isHardblock() == $block->isHardblock()
 302                         && $this->prevents( 'createaccount' ) == $block->prevents( 'createaccount' )
 303                         && $this->mExpiry == $block->mExpiry
 304                         && $this->isAutoblocking() == $block->isAutoblocking()
 305                         && $this->mHideName == $block->mHideName
 306                         && $this->prevents( 'sendemail' ) == $block->prevents( 'sendemail' )
 307                         && $this->prevents( 'editownusertalk' ) == $block->prevents( 'editownusertalk' )
 308                         && $this->mReason == $block->mReason
 309                         && $this->isSitewide() == $block->isSitewide()
 310                         // Block::getRestrictions() may perform a database query, so keep it at
 311                         // the end.
 312                         && BlockRestriction::equals( $this->getRestrictions(), $block->getRestrictions() )
 313                 );
 314         }
 315
 316         /**
 317          * Load a block from the database which affects the already-set $this->target:
 318          *     1) A block directly on the given user or IP
 319          *     2) A rangeblock encompassing the given IP (smallest first)
 320          *     3) An autoblock on the given IP
 321          * @param User|string|null $vagueTarget Also search for blocks affecting this target.  Doesn't
 322          *     make any sense to use TYPE_AUTO / TYPE_ID here. Leave blank to skip IP lookups.
 323          * @throws MWException
 324          * @return bool Whether a relevant block was found
 325          */
 326         protected function newLoad( $vagueTarget = null ) {
 327                 $db = wfGetDB( $this->mFromMaster ? DB_MASTER : DB_REPLICA );
 328
 329                 if ( $this->type !== null ) {
 330                         $conds = [
 331                                 'ipb_address' => [ (string)$this->target ],
 332                         ];
 333                 } else {
 334                         $conds = [ 'ipb_address' => [] ];
 335                 }
 336
 337                 # Be aware that the != '' check is explicit, since empty values will be
 338                 # passed by some callers (T31116)
 339                 if ( $vagueTarget != '' ) {
 340                         list( $target, $type ) = self::parseTarget( $vagueTarget );
 341                         switch ( $type ) {
 342                                 case self::TYPE_USER:
 343                                         # Slightly weird, but who are we to argue?
 344                                         $conds['ipb_address'][] = (string)$target;
 345                                         break;
 346
 347                                 case self::TYPE_IP:
 348                                         $conds['ipb_address'][] = (string)$target;
 349                                         $conds[] = self::getRangeCond( IP::toHex( $target ) );
 350                                         $conds = $db->makeList( $conds, LIST_OR );
 351                                         break;
 352
 353                                 case self::TYPE_RANGE:
 354                                         list( $start, $end ) = IP::parseRange( $target );
 355                                         $conds['ipb_address'][] = (string)$target;
 356                                         $conds[] = self::getRangeCond( $start, $end );
 357                                         $conds = $db->makeList( $conds, LIST_OR );
 358                                         break;
 359
 360                                 default:
 361                                         throw new MWException( "Tried to load block with invalid type" );
 362                         }
 363                 }
 364
 365                 $blockQuery = self::getQueryInfo();
 366                 $res = $db->select(
 367                         $blockQuery['tables'], $blockQuery['fields'], $conds, __METHOD__, [], $blockQuery['joins']
 368                 );
 369
 370                 # This result could contain a block on the user, a block on the IP, and a russian-doll
 371                 # set of rangeblocks.  We want to choose the most specific one, so keep a leader board.
 372                 $bestRow = null;
 373
 374                 # Lower will be better
 375                 $bestBlockScore = 100;
 376
 377                 # This is begging for $this = $bestBlock, but that's not allowed in PHP :(
 378                 $bestBlockPreventsEdit = null;
 379
 380                 foreach ( $res as $row ) {
 381                         $block = self::newFromRow( $row );
 382
 383                         # Don't use expired blocks
 384                         if ( $block->isExpired() ) {
 385                                 continue;
 386                         }
 387
 388                         # Don't use anon only blocks on users
 389                         if ( $this->type == self::TYPE_USER && !$block->isHardblock() ) {
 390                                 continue;
 391                         }
 392
 393                         if ( $block->getType() == self::TYPE_RANGE ) {
 394                                 # This is the number of bits that are allowed to vary in the block, give
 395                                 # or take some floating point errors
 396                                 $end = Wikimedia\base_convert( $block->getRangeEnd(), 16, 10 );
 397                                 $start = Wikimedia\base_convert( $block->getRangeStart(), 16, 10 );
 398                                 $size = log( $end - $start + 1, 2 );
 399
 400                                 # This has the nice property that a /32 block is ranked equally with a
 401                                 # single-IP block, which is exactly what it is...
 402                                 $score = self::TYPE_RANGE - 1 + ( $size / 128 );
 403
 404                         } else {
 405                                 $score = $block->getType();
 406                         }
 407
 408                         if ( $score < $bestBlockScore ) {
 409                                 $bestBlockScore = $score;
 410                                 $bestRow = $row;
 411                                 $bestBlockPreventsEdit = $block->prevents( 'edit' );
 412                         }
 413                 }
 414
 415                 if ( $bestRow !== null ) {
 416                         $this->initFromRow( $bestRow );
 417                         $this->prevents( 'edit', $bestBlockPreventsEdit );
 418                         return true;
 419                 } else {
 420                         return false;
 421                 }
 422         }
 423
 424         /**
 425          * Get a set of SQL conditions which will select rangeblocks encompassing a given range
 426          * @param string $start Hexadecimal IP representation
 427          * @param string|null $end Hexadecimal IP representation, or null to use $start = $end
 428          * @return string
 429          */
 430         public static function getRangeCond( $start, $end = null ) {
 431                 if ( $end === null ) {
 432                         $end = $start;
 433                 }
 434                 # Per T16634, we want to include relevant active rangeblocks; for
 435                 # rangeblocks, we want to include larger ranges which enclose the given
 436                 # range. We know that all blocks must be smaller than $wgBlockCIDRLimit,
 437                 # so we can improve performance by filtering on a LIKE clause
 438                 $chunk = self::getIpFragment( $start );
 439                 $dbr = wfGetDB( DB_REPLICA );
 440                 $like = $dbr->buildLike( $chunk, $dbr->anyString() );
 441
 442                 # Fairly hard to make a malicious SQL statement out of hex characters,
 443                 # but stranger things have happened...
 444                 $safeStart = $dbr->addQuotes( $start );
 445                 $safeEnd = $dbr->addQuotes( $end );
 446
 447                 return $dbr->makeList(
 448                         [
 449                                 "ipb_range_start $like",
 450                                 "ipb_range_start <= $safeStart",
 451                                 "ipb_range_end >= $safeEnd",
 452                         ],
 453                         LIST_AND
 454                 );
 455         }
 456
 457         /**
 458          * Get the component of an IP address which is certain to be the same between an IP
 459          * address and a rangeblock containing that IP address.
 460          * @param string $hex Hexadecimal IP representation
 461          * @return string
 462          */
 463         protected static function getIpFragment( $hex ) {
 464                 global $wgBlockCIDRLimit;
 465                 if ( substr( $hex, 0, 3 ) == 'v6-' ) {
 466                         return 'v6-' . substr( substr( $hex, 3 ), 0, floor( $wgBlockCIDRLimit['IPv6'] / 4 ) );
 467                 } else {
 468                         return substr( $hex, 0, floor( $wgBlockCIDRLimit['IPv4'] / 4 ) );
 469                 }
 470         }
 471
 472         /**
 473          * Given a database row from the ipblocks table, initialize
 474          * member variables
 475          * @param stdClass $row A row from the ipblocks table
 476          */
 477         protected function initFromRow( $row ) {
 478                 $this->setTarget( $row->ipb_address );
 479                 $this->setBlocker( User::newFromAnyId(
 480                         $row->ipb_by, $row->ipb_by_text, $row->ipb_by_actor ?? null
 481                 ) );
 482
 483                 $this->mTimestamp = wfTimestamp( TS_MW, $row->ipb_timestamp );
 484                 $this->mAuto = $row->ipb_auto;
 485                 $this->mHideName = $row->ipb_deleted;
 486                 $this->mId = (int)$row->ipb_id;
 487                 $this->mParentBlockId = $row->ipb_parent_block_id;
 488
 489                 // I wish I didn't have to do this
 490                 $db = wfGetDB( DB_REPLICA );
 491                 $this->mExpiry = $db->decodeExpiry( $row->ipb_expiry );
 492                 $this->mReason = CommentStore::getStore()
 493                         // Legacy because $row may have come from self::selectFields()
 494                         ->getCommentLegacy( $db, 'ipb_reason', $row )->text;
 495
 496                 $this->isHardblock( !$row->ipb_anon_only );
 497                 $this->isAutoblocking( $row->ipb_enable_autoblock );
 498                 $this->isSitewide( (bool)$row->ipb_sitewide );
 499
 500                 $this->prevents( 'createaccount', $row->ipb_create_account );
 501                 $this->prevents( 'sendemail', $row->ipb_block_email );
 502                 $this->prevents( 'editownusertalk', !$row->ipb_allow_usertalk );
 503         }
 504
 505         /**
 506          * Create a new Block object from a database row
 507          * @param stdClass $row Row from the ipblocks table
 508          * @return Block
 509          */
 510         public static function newFromRow( $row ) {
 511                 $block = new Block;
 512                 $block->initFromRow( $row );
 513                 return $block;
 514         }
 515
 516         /**
 517          * Delete the row from the IP blocks table.
 518          *
 519          * @throws MWException
 520          * @return bool
 521          */
 522         public function delete() {
 523                 if ( wfReadOnly() ) {
 524                         return false;
 525                 }
 526
 527                 if ( !$this->getId() ) {
 528                         throw new MWException( "Block::delete() requires that the mId member be filled\n" );
 529                 }
 530
 531                 $dbw = wfGetDB( DB_MASTER );
 532
 533                 BlockRestriction::deleteByParentBlockId( $this->getId() );
 534                 $dbw->delete( 'ipblocks', [ 'ipb_parent_block_id' => $this->getId() ], __METHOD__ );
 535
 536                 BlockRestriction::deleteByBlockId( $this->getId() );
 537                 $dbw->delete( 'ipblocks', [ 'ipb_id' => $this->getId() ], __METHOD__ );
 538
 539                 return $dbw->affectedRows() > 0;
 540         }
 541
 542         /**
 543          * Insert a block into the block table. Will fail if there is a conflicting
 544          * block (same name and options) already in the database.
 545          *
 546          * @param IDatabase|null $dbw If you have one available
 547          * @return bool|array False on failure, assoc array on success:
 548          *      ('id' => block ID, 'autoIds' => array of autoblock IDs)
 549          */
 550         public function insert( $dbw = null ) {
 551                 global $wgBlockDisablesLogin;
 552
 553                 if ( $this->getSystemBlockType() !== null ) {
 554                         throw new MWException( 'Cannot insert a system block into the database' );
 555                 }
 556                 if ( !$this->getBlocker() || $this->getBlocker()->getName() === '' ) {
 557                         throw new MWException( 'Cannot insert a block without a blocker set' );
 558                 }
 559
 560                 wfDebug( "Block::insert; timestamp {$this->mTimestamp}\n" );
 561
 562                 if ( $dbw === null ) {
 563                         $dbw = wfGetDB( DB_MASTER );
 564                 }
 565
 566                 self::purgeExpired();
 567
 568                 $row = $this->getDatabaseArray( $dbw );
 569
 570                 $dbw->insert( 'ipblocks', $row, __METHOD__, [ 'IGNORE' ] );
 571                 $affected = $dbw->affectedRows();
 572                 if ( $affected ) {
 573                         $this->setId( $dbw->insertId() );
 574                         if ( $this->restrictions ) {
 575                                 BlockRestriction::insert( $this->restrictions );
 576                         }
 577                 }
 578
 579                 # Don't collide with expired blocks.
 580                 # Do this after trying to insert to avoid locking.
 581                 if ( !$affected ) {
 582                         # T96428: The ipb_address index uses a prefix on a field, so
 583                         # use a standard SELECT + DELETE to avoid annoying gap locks.
 584                         $ids = $dbw->selectFieldValues( 'ipblocks',
 585                                 'ipb_id',
 586                                 [
 587                                         'ipb_address' => $row['ipb_address'],
 588                                         'ipb_user' => $row['ipb_user'],
 589                                         'ipb_expiry < ' . $dbw->addQuotes( $dbw->timestamp() )
 590                                 ],
 591                                 __METHOD__
 592                         );
 593                         if ( $ids ) {
 594                                 $dbw->delete( 'ipblocks', [ 'ipb_id' => $ids ], __METHOD__ );
 595                                 BlockRestriction::deleteByBlockId( $ids );
 596                                 $dbw->insert( 'ipblocks', $row, __METHOD__, [ 'IGNORE' ] );
 597                                 $affected = $dbw->affectedRows();
 598                                 $this->setId( $dbw->insertId() );
 599                                 if ( $this->restrictions ) {
 600                                         BlockRestriction::insert( $this->restrictions );
 601                                 }
 602                         }
 603                 }
 604
 605                 if ( $affected ) {
 606                         $auto_ipd_ids = $this->doRetroactiveAutoblock();
 607
 608                         if ( $wgBlockDisablesLogin && $this->target instanceof User ) {
 609                                 // Change user login token to force them to be logged out.
 610                                 $this->target->setToken();
 611                                 $this->target->saveSettings();
 612                         }
 613
 614                         return [ 'id' => $this->mId, 'autoIds' => $auto_ipd_ids ];
 615                 }
 616
 617                 return false;
 618         }
 619
 620         /**
 621          * Update a block in the DB with new parameters.
 622          * The ID field needs to be loaded first.
 623          *
 624          * @return bool|array False on failure, array on success:
 625          *   ('id' => block ID, 'autoIds' => array of autoblock IDs)
 626          */
 627         public function update() {
 628                 wfDebug( "Block::update; timestamp {$this->mTimestamp}\n" );
 629                 $dbw = wfGetDB( DB_MASTER );
 630
 631                 $dbw->startAtomic( __METHOD__ );
 632
 633                 $result = $dbw->update(
 634                         'ipblocks',
 635                         $this->getDatabaseArray( $dbw ),
 636                         [ 'ipb_id' => $this->getId() ],
 637                         __METHOD__
 638                 );
 639
 640                 // Only update the restrictions if they have been modified.
 641                 if ( $this->restrictions !== null ) {
 642                         // An empty array should remove all of the restrictions.
 643                         if ( empty( $this->restrictions ) ) {
 644                                 $success = BlockRestriction::deleteByBlockId( $this->getId() );
 645                         } else {
 646                                 $success = BlockRestriction::update( $this->restrictions );
 647                         }
 648                         // Update the result. The first false is the result, otherwise, true.
 649                         $result = $result && $success;
 650                 }
 651
 652                 if ( $this->isAutoblocking() ) {
 653                         // update corresponding autoblock(s) (T50813)
 654                         $dbw->update(
 655                                 'ipblocks',
 656                                 $this->getAutoblockUpdateArray( $dbw ),
 657                                 [ 'ipb_parent_block_id' => $this->getId() ],
 658                                 __METHOD__
 659                         );
 660
 661                         // Only update the restrictions if they have been modified.
 662                         if ( $this->restrictions !== null ) {
 663                                 BlockRestriction::updateByParentBlockId( $this->getId(), $this->restrictions );
 664                         }
 665                 } else {
 666                         // autoblock no longer required, delete corresponding autoblock(s)
 667                         BlockRestriction::deleteByParentBlockId( $this->getId() );
 668                         $dbw->delete(
 669                                 'ipblocks',
 670                                 [ 'ipb_parent_block_id' => $this->getId() ],
 671                                 __METHOD__
 672                         );
 673                 }
 674
 675                 $dbw->endAtomic( __METHOD__ );
 676
 677                 if ( $result ) {
 678                         $auto_ipd_ids = $this->doRetroactiveAutoblock();
 679                         return [ 'id' => $this->mId, 'autoIds' => $auto_ipd_ids ];
 680                 }
 681
 682                 return $result;
 683         }
 684
 685         /**
 686          * Get an array suitable for passing to $dbw->insert() or $dbw->update()
 687          * @param IDatabase $dbw
 688          * @return array
 689          */
 690         protected function getDatabaseArray( IDatabase $dbw ) {
 691                 $expiry = $dbw->encodeExpiry( $this->mExpiry );
 692
 693                 if ( $this->forcedTargetID ) {
 694                         $uid = $this->forcedTargetID;
 695                 } else {
 696                         $uid = $this->target instanceof User ? $this->target->getId() : 0;
 697                 }
 698
 699                 $a = [
 700                         'ipb_address'          => (string)$this->target,
 701                         'ipb_user'             => $uid,
 702                         'ipb_timestamp'        => $dbw->timestamp( $this->mTimestamp ),
 703                         'ipb_auto'             => $this->mAuto,
 704                         'ipb_anon_only'        => !$this->isHardblock(),
 705                         'ipb_create_account'   => $this->prevents( 'createaccount' ),
 706                         'ipb_enable_autoblock' => $this->isAutoblocking(),
 707                         'ipb_expiry'           => $expiry,
 708                         'ipb_range_start'      => $this->getRangeStart(),
 709                         'ipb_range_end'        => $this->getRangeEnd(),
 710                         'ipb_deleted'          => intval( $this->mHideName ), // typecast required for SQLite
 711                         'ipb_block_email'      => $this->prevents( 'sendemail' ),
 712                         'ipb_allow_usertalk'   => !$this->prevents( 'editownusertalk' ),
 713                         'ipb_parent_block_id'  => $this->mParentBlockId,
 714                         'ipb_sitewide'         => $this->isSitewide(),
 715                 ] + CommentStore::getStore()->insert( $dbw, 'ipb_reason', $this->mReason )
 716                         + ActorMigration::newMigration()->getInsertValues( $dbw, 'ipb_by', $this->getBlocker() );
 717
 718                 return $a;
 719         }
 720
 721         /**
 722          * @param IDatabase $dbw
 723          * @return array
 724          */
 725         protected function getAutoblockUpdateArray( IDatabase $dbw ) {
 726                 return [
 727                         'ipb_create_account'   => $this->prevents( 'createaccount' ),
 728                         'ipb_deleted'          => (int)$this->mHideName, // typecast required for SQLite
 729                         'ipb_allow_usertalk'   => !$this->prevents( 'editownusertalk' ),
 730                         'ipb_sitewide'         => $this->isSitewide(),
 731                 ] + CommentStore::getStore()->insert( $dbw, 'ipb_reason', $this->mReason )
 732                         + ActorMigration::newMigration()->getInsertValues( $dbw, 'ipb_by', $this->getBlocker() );
 733         }
 734
 735         /**
 736          * Retroactively autoblocks the last IP used by the user (if it is a user)
 737          * blocked by this Block.
 738          *
 739          * @return array Block IDs of retroactive autoblocks made
 740          */
 741         protected function doRetroactiveAutoblock() {
 742                 $blockIds = [];
 743                 # If autoblock is enabled, autoblock the LAST IP(s) used
 744                 if ( $this->isAutoblocking() && $this->getType() == self::TYPE_USER ) {
 745                         wfDebug( "Doing retroactive autoblocks for " . $this->getTarget() . "\n" );
 746
 747                         $continue = Hooks::run(
 748                                 'PerformRetroactiveAutoblock', [ $this, &$blockIds ] );
 749
 750                         if ( $continue ) {
 751                                 self::defaultRetroactiveAutoblock( $this, $blockIds );
 752                         }
 753                 }
 754                 return $blockIds;
 755         }
 756
 757         /**
 758          * Retroactively autoblocks the last IP used by the user (if it is a user)
 759          * blocked by this Block. This will use the recentchanges table.
 760          *
 761          * @param Block $block
 762          * @param array &$blockIds
 763          */
 764         protected static function defaultRetroactiveAutoblock( Block $block, array &$blockIds ) {
 765                 global $wgPutIPinRC;
 766
 767                 // No IPs are in recentchanges table, so nothing to select
 768                 if ( !$wgPutIPinRC ) {
 769                         return;
 770                 }
 771
 772                 // Autoblocks only apply to TYPE_USER
 773                 if ( $block->getType() !== self::TYPE_USER ) {
 774                         return;
 775                 }
 776                 $target = $block->getTarget(); // TYPE_USER => always a User object
 777
 778                 $dbr = wfGetDB( DB_REPLICA );
 779                 $rcQuery = ActorMigration::newMigration()->getWhere( $dbr, 'rc_user', $target, false );
 780
 781                 $options = [ 'ORDER BY' => 'rc_timestamp DESC' ];
 782
 783                 // Just the last IP used.
 784                 $options['LIMIT'] = 1;
 785
 786                 $res = $dbr->select(
 787                         [ 'recentchanges' ] + $rcQuery['tables'],
 788                         [ 'rc_ip' ],
 789                         $rcQuery['conds'],
 790                         __METHOD__,
 791                         $options,
 792                         $rcQuery['joins']
 793                 );
 794
 795                 if ( !$res->numRows() ) {
 796                         # No results, don't autoblock anything
 797                         wfDebug( "No IP found to retroactively autoblock\n" );
 798                 } else {
 799                         foreach ( $res as $row ) {
 800                                 if ( $row->rc_ip ) {
 801                                         $id = $block->doAutoblock( $row->rc_ip );
 802                                         if ( $id ) {
 803                                                 $blockIds[] = $id;
 804                                         }
 805                                 }
 806                         }
 807                 }
 808         }
 809
 810         /**
 811          * Checks whether a given IP is on the autoblock whitelist.
 812          * TODO: this probably belongs somewhere else, but not sure where...
 813          *
 814          * @param string $ip The IP to check
 815          * @return bool
 816          */
 817         public static function isWhitelistedFromAutoblocks( $ip ) {
 818                 // Try to get the autoblock_whitelist from the cache, as it's faster
 819                 // than getting the msg raw and explode()'ing it.
 820                 $cache = MediaWikiServices::getInstance()->getMainWANObjectCache();
 821                 $lines = $cache->getWithSetCallback(
 822                         $cache->makeKey( 'ip-autoblock', 'whitelist' ),
 823                         $cache::TTL_DAY,
 824                         function ( $curValue, &$ttl, array &$setOpts ) {
 825                                 $setOpts += Database::getCacheSetOptions( wfGetDB( DB_REPLICA ) );
 826
 827                                 return explode( "\n",
 828                                         wfMessage( 'autoblock_whitelist' )->inContentLanguage()->plain() );
 829                         }
 830                 );
 831
 832                 wfDebug( "Checking the autoblock whitelist..\n" );
 833
 834                 foreach ( $lines as $line ) {
 835                         # List items only
 836                         if ( substr( $line, 0, 1 ) !== '*' ) {
 837                                 continue;
 838                         }
 839
 840                         $wlEntry = substr( $line, 1 );
 841                         $wlEntry = trim( $wlEntry );
 842
 843                         wfDebug( "Checking $ip against $wlEntry..." );
 844
 845                         # Is the IP in this range?
 846                         if ( IP::isInRange( $ip, $wlEntry ) ) {
 847                                 wfDebug( " IP $ip matches $wlEntry, not autoblocking\n" );
 848                                 return true;
 849                         } else {
 850                                 wfDebug( " No match\n" );
 851                         }
 852                 }
 853
 854                 return false;
 855         }
 856
 857         /**
 858          * Autoblocks the given IP, referring to this Block.
 859          *
 860          * @param string $autoblockIP The IP to autoblock.
 861          * @return int|bool Block ID if an autoblock was inserted, false if not.
 862          */
 863         public function doAutoblock( $autoblockIP ) {
 864                 # If autoblocks are disabled, go away.
 865                 if ( !$this->isAutoblocking() ) {
 866                         return false;
 867                 }
 868
 869                 # Don't autoblock for system blocks
 870                 if ( $this->getSystemBlockType() !== null ) {
 871                         throw new MWException( 'Cannot autoblock from a system block' );
 872                 }
 873
 874                 # Check for presence on the autoblock whitelist.
 875                 if ( self::isWhitelistedFromAutoblocks( $autoblockIP ) ) {
 876                         return false;
 877                 }
 878
 879                 // Avoid PHP 7.1 warning of passing $this by reference
 880                 $block = $this;
 881                 # Allow hooks to cancel the autoblock.
 882                 if ( !Hooks::run( 'AbortAutoblock', [ $autoblockIP, &$block ] ) ) {
 883                         wfDebug( "Autoblock aborted by hook.\n" );
 884                         return false;
 885                 }
 886
 887                 # It's okay to autoblock. Go ahead and insert/update the block...
 888
 889                 # Do not add a *new* block if the IP is already blocked.
 890                 $ipblock = self::newFromTarget( $autoblockIP );
 891                 if ( $ipblock ) {
 892                         # Check if the block is an autoblock and would exceed the user block
 893                         # if renewed. If so, do nothing, otherwise prolong the block time...
 894                         if ( $ipblock->mAuto && // @todo Why not compare $ipblock->mExpiry?
 895                                 $this->mExpiry > self::getAutoblockExpiry( $ipblock->mTimestamp )
 896                         ) {
 897                                 # Reset block timestamp to now and its expiry to
 898                                 # $wgAutoblockExpiry in the future
 899                                 $ipblock->updateTimestamp();
 900                         }
 901                         return false;
 902                 }
 903
 904                 # Make a new block object with the desired properties.
 905                 $autoblock = new Block;
 906                 wfDebug( "Autoblocking {$this->getTarget()}@" . $autoblockIP . "\n" );
 907                 $autoblock->setTarget( $autoblockIP );
 908                 $autoblock->setBlocker( $this->getBlocker() );
 909                 $autoblock->mReason = wfMessage( 'autoblocker', $this->getTarget(), $this->mReason )
 910                         ->inContentLanguage()->plain();
 911                 $timestamp = wfTimestampNow();
 912                 $autoblock->mTimestamp = $timestamp;
 913                 $autoblock->mAuto = 1;
 914                 $autoblock->prevents( 'createaccount', $this->prevents( 'createaccount' ) );
 915                 # Continue suppressing the name if needed
 916                 $autoblock->mHideName = $this->mHideName;
 917                 $autoblock->prevents( 'editownusertalk', $this->prevents( 'editownusertalk' ) );
 918                 $autoblock->mParentBlockId = $this->mId;
 919                 $autoblock->isSitewide( $this->isSitewide() );
 920                 $autoblock->setRestrictions( $this->getRestrictions() );
 921
 922                 if ( $this->mExpiry == 'infinity' ) {
 923                         # Original block was indefinite, start an autoblock now
 924                         $autoblock->mExpiry = self::getAutoblockExpiry( $timestamp );
 925                 } else {
 926                         # If the user is already blocked with an expiry date, we don't
 927                         # want to pile on top of that.
 928                         $autoblock->mExpiry = min( $this->mExpiry, self::getAutoblockExpiry( $timestamp ) );
 929                 }
 930
 931                 # Insert the block...
 932                 $status = $autoblock->insert();
 933                 return $status
 934                         ? $status['id']
 935                         : false;
 936         }
 937
 938         /**
 939          * Check if a block has expired. Delete it if it is.
 940          * @return bool
 941          */
 942         public function deleteIfExpired() {
 943                 if ( $this->isExpired() ) {
 944                         wfDebug( "Block::deleteIfExpired() -- deleting\n" );
 945                         $this->delete();
 946                         $retVal = true;
 947                 } else {
 948                         wfDebug( "Block::deleteIfExpired() -- not expired\n" );
 949                         $retVal = false;
 950                 }
 951
 952                 return $retVal;
 953         }
 954
 955         /**
 956          * Has the block expired?
 957          * @return bool
 958          */
 959         public function isExpired() {
 960                 $timestamp = wfTimestampNow();
 961                 wfDebug( "Block::isExpired() checking current " . $timestamp . " vs $this->mExpiry\n" );
 962
 963                 if ( !$this->mExpiry ) {
 964                         return false;
 965                 } else {
 966                         return $timestamp > $this->mExpiry;
 967                 }
 968         }
 969
 970         /**
 971          * Is the block address valid (i.e. not a null string?)
 972          * @return bool
 973          */
 974         public function isValid() {
 975                 return $this->getTarget() != null;
 976         }
 977
 978         /**
 979          * Update the timestamp on autoblocks.
 980          */
 981         public function updateTimestamp() {
 982                 if ( $this->mAuto ) {
 983                         $this->mTimestamp = wfTimestamp();
 984                         $this->mExpiry = self::getAutoblockExpiry( $this->mTimestamp );
 985
 986                         $dbw = wfGetDB( DB_MASTER );
 987                         $dbw->update( 'ipblocks',
 988                                 [ /* SET */
 989                                         'ipb_timestamp' => $dbw->timestamp( $this->mTimestamp ),
 990                                         'ipb_expiry' => $dbw->timestamp( $this->mExpiry ),
 991                                 ],
 992                                 [ /* WHERE */
 993                                         'ipb_id' => $this->getId(),
 994                                 ],
 995                                 __METHOD__
 996                         );
 997                 }
 998         }
 999
1000         /**
1001          * Get the IP address at the start of the range in Hex form
1002          * @throws MWException
1003          * @return string IP in Hex form
1004          */
1005         public function getRangeStart() {
1006                 switch ( $this->type ) {
1007                         case self::TYPE_USER:
1008                                 return '';
1009                         case self::TYPE_IP:
1010                                 return IP::toHex( $this->target );
1011                         case self::TYPE_RANGE:
1012                                 list( $start, /*...*/ ) = IP::parseRange( $this->target );
1013                                 return $start;
1014                         default:
1015                                 throw new MWException( "Block with invalid type" );
1016                 }
1017         }
1018
1019         /**
1020          * Get the IP address at the end of the range in Hex form
1021          * @throws MWException
1022          * @return string IP in Hex form
1023          */
1024         public function getRangeEnd() {
1025                 switch ( $this->type ) {
1026                         case self::TYPE_USER:
1027                                 return '';
1028                         case self::TYPE_IP:
1029                                 return IP::toHex( $this->target );
1030                         case self::TYPE_RANGE:
1031                                 list( /*...*/, $end ) = IP::parseRange( $this->target );
1032                                 return $end;
1033                         default:
1034                                 throw new MWException( "Block with invalid type" );
1035                 }
1036         }
1037
1038         /**
1039          * Get the user id of the blocking sysop
1040          *
1041          * @return int (0 for foreign users)
1042          */
1043         public function getBy() {
1044                 $blocker = $this->getBlocker();
1045                 return ( $blocker instanceof User )
1046                         ? $blocker->getId()
1047                         : 0;
1048         }
1049
1050         /**
1051          * Get the username of the blocking sysop
1052          *
1053          * @return string
1054          */
1055         public function getByName() {
1056                 $blocker = $this->getBlocker();
1057                 return ( $blocker instanceof User )
1058                         ? $blocker->getName()
1059                         : (string)$blocker; // username
1060         }
1061
1062         /**
1063          * Get the block ID
1064          * @return int
1065          */
1066         public function getId() {
1067                 return $this->mId;
1068         }
1069
1070         /**
1071          * Set the block ID
1072          *
1073          * @param int $blockId
1074          * @return int
1075          */
1076         private function setId( $blockId ) {
1077                 $this->mId = (int)$blockId;
1078
1079                 if ( is_array( $this->restrictions ) ) {
1080                         $this->restrictions = BlockRestriction::setBlockId( $blockId, $this->restrictions );
1081                 }
1082
1083                 return $this;
1084         }
1085
1086         /**
1087          * Get the system block type, if any
1088          * @since 1.29
1089          * @return string|null
1090          */
1091         public function getSystemBlockType() {
1092                 return $this->systemBlockType;
1093         }
1094
1095         /**
1096          * Get/set a flag determining whether the master is used for reads
1097          *
1098          * @param bool|null $x
1099          * @return bool
1100          */
1101         public function fromMaster( $x = null ) {
1102                 return wfSetVar( $this->mFromMaster, $x );
1103         }
1104
1105         /**
1106          * Get/set whether the Block is a hardblock (affects logged-in users on a given IP/range)
1107          * @param bool|null $x
1108          * @return bool
1109          */
1110         public function isHardblock( $x = null ) {
1111                 wfSetVar( $this->isHardblock, $x );
1112
1113                 # You can't *not* hardblock a user
1114                 return $this->getType() == self::TYPE_USER
1115                         ? true
1116                         : $this->isHardblock;
1117         }
1118
1119         /**
1120          * @param null|bool $x
1121          * @return bool
1122          */
1123         public function isAutoblocking( $x = null ) {
1124                 wfSetVar( $this->isAutoblocking, $x );
1125
1126                 # You can't put an autoblock on an IP or range as we don't have any history to
1127                 # look over to get more IPs from
1128                 return $this->getType() == self::TYPE_USER
1129                         ? $this->isAutoblocking
1130                         : false;
1131         }
1132
1133         /**
1134          * Indicates that the block is a sitewide block. This means the user is
1135          * prohibited from editing any page on the site (other than their own talk
1136          * page).
1137          *
1138          * @since 1.33
1139          * @param null|bool $x
1140          * @return bool
1141          */
1142         public function isSitewide( $x = null ) {
1143                 return wfSetVar( $this->isSitewide, $x );
1144         }
1145
1146         /**
1147          * Get/set whether the Block prevents a given action
1148          *
1149          * @param string $action Action to check
1150          * @param bool|null $x Value for set, or null to just get value
1151          * @return bool|null Null for unrecognized rights.
1152          */
1153         public function prevents( $action, $x = null ) {
1154                 $config = RequestContext::getMain()->getConfig();
1155                 $blockDisablesLogin = $config->get( 'BlockDisablesLogin' );
1156                 $blockAllowsUTEdit = $config->get( 'BlockAllowsUTEdit' );
1157
1158                 $res = null;
1159                 switch ( $action ) {
1160                         case 'edit':
1161                                 # For now... <evil laugh>
1162                                 $res = true;
1163                                 break;
1164                         case 'createaccount':
1165                                 $res = wfSetVar( $this->mCreateAccount, $x );
1166                                 break;
1167                         case 'sendemail':
1168                                 $res = wfSetVar( $this->mBlockEmail, $x );
1169                                 break;
1170                         case 'upload':
1171                                 // Until T6995 is completed
1172                                 $res = $this->isSitewide();
1173                                 break;
1174                         case 'editownusertalk':
1175                                 // NOTE: this check is not reliable on partial blocks
1176                                 // since partially blocked users are always allowed to edit
1177                                 // their own talk page unless a restriction exists on the
1178                                 // page or User_talk: namespace
1179                                 $res = wfSetVar( $this->mDisableUsertalk, $x );
1180
1181                                 // edit own user talk can be disabled by config
1182                                 if ( !$blockAllowsUTEdit ) {
1183                                         $res = true;
1184                                 }
1185                                 break;
1186                         case 'read':
1187                                 $res = false;
1188                                 break;
1189                 }
1190                 if ( !$res && $blockDisablesLogin ) {
1191                         // If a block would disable login, then it should
1192                         // prevent any action that all users cannot do
1193                         $anon = new User;
1194                         $res = $anon->isAllowed( $action ) ? $res : true;
1195                 }
1196
1197                 return $res;
1198         }
1199
1200         /**
1201          * Get the block name, but with autoblocked IPs hidden as per standard privacy policy
1202          * @return string Text is escaped
1203          */
1204         public function getRedactedName() {
1205                 if ( $this->mAuto ) {
1206                         return Html::rawElement(
1207                                 'span',
1208                                 [ 'class' => 'mw-autoblockid' ],
1209                                 wfMessage( 'autoblockid', $this->mId )
1210                         );
1211                 } else {
1212                         return htmlspecialchars( $this->getTarget() );
1213                 }
1214         }
1215
1216         /**
1217          * Get a timestamp of the expiry for autoblocks
1218          *
1219          * @param string|int $timestamp
1220          * @return string
1221          */
1222         public static function getAutoblockExpiry( $timestamp ) {
1223                 global $wgAutoblockExpiry;
1224
1225                 return wfTimestamp( TS_MW, wfTimestamp( TS_UNIX, $timestamp ) + $wgAutoblockExpiry );
1226         }
1227
1228         /**
1229          * Purge expired blocks from the ipblocks table
1230          */
1231         public static function purgeExpired() {
1232                 if ( wfReadOnly() ) {
1233                         return;
1234                 }
1235
1236                 DeferredUpdates::addUpdate( new AutoCommitUpdate(
1237                         wfGetDB( DB_MASTER ),
1238                         __METHOD__,
1239                         function ( IDatabase $dbw, $fname ) {
1240                                 $ids = $dbw->selectFieldValues( 'ipblocks',
1241                                         'ipb_id',
1242                                         [ 'ipb_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ],
1243                                         $fname
1244                                 );
1245                                 if ( $ids ) {
1246                                         BlockRestriction::deleteByBlockId( $ids );
1247                                         $dbw->delete( 'ipblocks', [ 'ipb_id' => $ids ], $fname );
1248                                 }
1249                         }
1250                 ) );
1251         }
1252
1253         /**
1254          * Given a target and the target's type, get an existing Block object if possible.
1255          * @param string|User|int $specificTarget A block target, which may be one of several types:
1256          *     * A user to block, in which case $target will be a User
1257          *     * An IP to block, in which case $target will be a User generated by using
1258          *       User::newFromName( $ip, false ) to turn off name validation
1259          *     * An IP range, in which case $target will be a String "123.123.123.123/18" etc
1260          *     * The ID of an existing block, in the format "#12345" (since pure numbers are valid
1261          *       usernames
1262          *     Calling this with a user, IP address or range will not select autoblocks, and will
1263          *     only select a block where the targets match exactly (so looking for blocks on
1264          *     1.2.3.4 will not select 1.2.0.0/16 or even 1.2.3.4/32)
1265          * @param string|User|int|null $vagueTarget As above, but we will search for *any* block which
1266          *     affects that target (so for an IP address, get ranges containing that IP; and also
1267          *     get any relevant autoblocks). Leave empty or blank to skip IP-based lookups.
1268          * @param bool $fromMaster Whether to use the DB_MASTER database
1269          * @return Block|null (null if no relevant block could be found).  The target and type
1270          *     of the returned Block will refer to the actual block which was found, which might
1271          *     not be the same as the target you gave if you used $vagueTarget!
1272          */
1273         public static function newFromTarget( $specificTarget, $vagueTarget = null, $fromMaster = false ) {
1274                 list( $target, $type ) = self::parseTarget( $specificTarget );
1275                 if ( $type == self::TYPE_ID || $type == self::TYPE_AUTO ) {
1276                         return self::newFromID( $target );
1277
1278                 } elseif ( $target === null && $vagueTarget == '' ) {
1279                         # We're not going to find anything useful here
1280                         # Be aware that the == '' check is explicit, since empty values will be
1281                         # passed by some callers (T31116)
1282                         return null;
1283
1284                 } elseif ( in_array(
1285                         $type,
1286                         [ self::TYPE_USER, self::TYPE_IP, self::TYPE_RANGE, null ] )
1287                 ) {
1288                         $block = new Block();
1289                         $block->fromMaster( $fromMaster );
1290
1291                         if ( $type !== null ) {
1292                                 $block->setTarget( $target );
1293                         }
1294
1295                         if ( $block->newLoad( $vagueTarget ) ) {
1296                                 return $block;
1297                         }
1298                 }
1299                 return null;
1300         }
1301
1302         /**
1303          * Get all blocks that match any IP from an array of IP addresses
1304          *
1305          * @param array $ipChain List of IPs (strings), usually retrieved from the
1306          *     X-Forwarded-For header of the request
1307          * @param bool $isAnon Exclude anonymous-only blocks if false
1308          * @param bool $fromMaster Whether to query the master or replica DB
1309          * @return array Array of Blocks
1310          * @since 1.22
1311          */
1312         public static function getBlocksForIPList( array $ipChain, $isAnon, $fromMaster = false ) {
1313                 if ( $ipChain === [] ) {
1314                         return [];
1315                 }
1316
1317                 $conds = [];
1318                 $proxyLookup = MediaWikiServices::getInstance()->getProxyLookup();
1319                 foreach ( array_unique( $ipChain ) as $ipaddr ) {
1320                         # Discard invalid IP addresses. Since XFF can be spoofed and we do not
1321                         # necessarily trust the header given to us, make sure that we are only
1322                         # checking for blocks on well-formatted IP addresses (IPv4 and IPv6).
1323                         # Do not treat private IP spaces as special as it may be desirable for wikis
1324                         # to block those IP ranges in order to stop misbehaving proxies that spoof XFF.
1325                         if ( !IP::isValid( $ipaddr ) ) {
1326                                 continue;
1327                         }
1328                         # Don't check trusted IPs (includes local squids which will be in every request)
1329                         if ( $proxyLookup->isTrustedProxy( $ipaddr ) ) {
1330                                 continue;
1331                         }
1332                         # Check both the original IP (to check against single blocks), as well as build
1333                         # the clause to check for rangeblocks for the given IP.
1334                         $conds['ipb_address'][] = $ipaddr;
1335                         $conds[] = self::getRangeCond( IP::toHex( $ipaddr ) );
1336                 }
1337
1338                 if ( $conds === [] ) {
1339                         return [];
1340                 }
1341
1342                 if ( $fromMaster ) {
1343                         $db = wfGetDB( DB_MASTER );
1344                 } else {
1345                         $db = wfGetDB( DB_REPLICA );
1346                 }
1347                 $conds = $db->makeList( $conds, LIST_OR );
1348                 if ( !$isAnon ) {
1349                         $conds = [ $conds, 'ipb_anon_only' => 0 ];
1350                 }
1351                 $blockQuery = self::getQueryInfo();
1352                 $rows = $db->select(
1353                         $blockQuery['tables'],
1354                         array_merge( [ 'ipb_range_start', 'ipb_range_end' ], $blockQuery['fields'] ),
1355                         $conds,
1356                         __METHOD__,
1357                         [],
1358                         $blockQuery['joins']
1359                 );
1360
1361                 $blocks = [];
1362                 foreach ( $rows as $row ) {
1363                         $block = self::newFromRow( $row );
1364                         if ( !$block->isExpired() ) {
1365                                 $blocks[] = $block;
1366                         }
1367                 }
1368
1369                 return $blocks;
1370         }
1371
1372         /**
1373          * From a list of multiple blocks, find the most exact and strongest Block.
1374          *
1375          * The logic for finding the "best" block is:
1376          *  - Blocks that match the block's target IP are preferred over ones in a range
1377          *  - Hardblocks are chosen over softblocks that prevent account creation
1378          *  - Softblocks that prevent account creation are chosen over other softblocks
1379          *  - Other softblocks are chosen over autoblocks
1380          *  - If there are multiple exact or range blocks at the same level, the one chosen
1381          *    is random
1382          * This should be used when $blocks where retrieved from the user's IP address
1383          * and $ipChain is populated from the same IP address information.
1384          *
1385          * @param array $blocks Array of Block objects
1386          * @param array $ipChain List of IPs (strings). This is used to determine how "close"
1387          *     a block is to the server, and if a block matches exactly, or is in a range.
1388          *     The order is furthest from the server to nearest e.g., (Browser, proxy1, proxy2,
1389          *     local-squid, ...)
1390          * @throws MWException
1391          * @return Block|null The "best" block from the list
1392          */
1393         public static function chooseBlock( array $blocks, array $ipChain ) {
1394                 if ( $blocks === [] ) {
1395                         return null;
1396                 } elseif ( count( $blocks ) == 1 ) {
1397                         return $blocks[0];
1398                 }
1399
1400                 // Sort hard blocks before soft ones and secondarily sort blocks
1401                 // that disable account creation before those that don't.
1402                 usort( $blocks, function ( Block $a, Block $b ) {
1403                         $aWeight = (int)$a->isHardblock() . (int)$a->prevents( 'createaccount' );
1404                         $bWeight = (int)$b->isHardblock() . (int)$b->prevents( 'createaccount' );
1405                         return strcmp( $bWeight, $aWeight ); // highest weight first
1406                 } );
1407
1408                 $blocksListExact = [
1409                         'hard' => false,
1410                         'disable_create' => false,
1411                         'other' => false,
1412                         'auto' => false
1413                 ];
1414                 $blocksListRange = [
1415                         'hard' => false,
1416                         'disable_create' => false,
1417                         'other' => false,
1418                         'auto' => false
1419                 ];
1420                 $ipChain = array_reverse( $ipChain );
1421
1422                 /** @var Block $block */
1423                 foreach ( $blocks as $block ) {
1424                         // Stop searching if we have already have a "better" block. This
1425                         // is why the order of the blocks matters
1426                         if ( !$block->isHardblock() && $blocksListExact['hard'] ) {
1427                                 break;
1428                         } elseif ( !$block->prevents( 'createaccount' ) && $blocksListExact['disable_create'] ) {
1429                                 break;
1430                         }
1431
1432                         foreach ( $ipChain as $checkip ) {
1433                                 $checkipHex = IP::toHex( $checkip );
1434                                 if ( (string)$block->getTarget() === $checkip ) {
1435                                         if ( $block->isHardblock() ) {
1436                                                 $blocksListExact['hard'] = $blocksListExact['hard'] ?: $block;
1437                                         } elseif ( $block->prevents( 'createaccount' ) ) {
1438                                                 $blocksListExact['disable_create'] = $blocksListExact['disable_create'] ?: $block;
1439                                         } elseif ( $block->mAuto ) {
1440                                                 $blocksListExact['auto'] = $blocksListExact['auto'] ?: $block;
1441                                         } else {
1442                                                 $blocksListExact['other'] = $blocksListExact['other'] ?: $block;
1443                                         }
1444                                         // We found closest exact match in the ip list, so go to the next Block
1445                                         break;
1446                                 } elseif ( array_filter( $blocksListExact ) == []
1447                                         && $block->getRangeStart() <= $checkipHex
1448                                         && $block->getRangeEnd() >= $checkipHex
1449                                 ) {
1450                                         if ( $block->isHardblock() ) {
1451                                                 $blocksListRange['hard'] = $blocksListRange['hard'] ?: $block;
1452                                         } elseif ( $block->prevents( 'createaccount' ) ) {
1453                                                 $blocksListRange['disable_create'] = $blocksListRange['disable_create'] ?: $block;
1454                                         } elseif ( $block->mAuto ) {
1455                                                 $blocksListRange['auto'] = $blocksListRange['auto'] ?: $block;
1456                                         } else {
1457                                                 $blocksListRange['other'] = $blocksListRange['other'] ?: $block;
1458                                         }
1459                                         break;
1460                                 }
1461                         }
1462                 }
1463
1464                 if ( array_filter( $blocksListExact ) == [] ) {
1465                         $blocksList = &$blocksListRange;
1466                 } else {
1467                         $blocksList = &$blocksListExact;
1468                 }
1469
1470                 $chosenBlock = null;
1471                 if ( $blocksList['hard'] ) {
1472                         $chosenBlock = $blocksList['hard'];
1473                 } elseif ( $blocksList['disable_create'] ) {
1474                         $chosenBlock = $blocksList['disable_create'];
1475                 } elseif ( $blocksList['other'] ) {
1476                         $chosenBlock = $blocksList['other'];
1477                 } elseif ( $blocksList['auto'] ) {
1478                         $chosenBlock = $blocksList['auto'];
1479                 } else {
1480                         throw new MWException( "Proxy block found, but couldn't be classified." );
1481                 }
1482
1483                 return $chosenBlock;
1484         }
1485
1486         /**
1487          * From an existing Block, get the target and the type of target.
1488          * Note that, except for null, it is always safe to treat the target
1489          * as a string; for User objects this will return User::__toString()
1490          * which in turn gives User::getName().
1491          *
1492          * @param string|int|User|null $target
1493          * @return array [ User|String|null, Block::TYPE_ constant|null ]
1494          */
1495         public static function parseTarget( $target ) {
1496                 # We may have been through this before
1497                 if ( $target instanceof User ) {
1498                         if ( IP::isValid( $target->getName() ) ) {
1499                                 return [ $target, self::TYPE_IP ];
1500                         } else {
1501                                 return [ $target, self::TYPE_USER ];
1502                         }
1503                 } elseif ( $target === null ) {
1504                         return [ null, null ];
1505                 }
1506
1507                 $target = trim( $target );
1508
1509                 if ( IP::isValid( $target ) ) {
1510                         # We can still create a User if it's an IP address, but we need to turn
1511                         # off validation checking (which would exclude IP addresses)
1512                         return [
1513                                 User::newFromName( IP::sanitizeIP( $target ), false ),
1514                                 self::TYPE_IP
1515                         ];
1516
1517                 } elseif ( IP::isValidRange( $target ) ) {
1518                         # Can't create a User from an IP range
1519                         return [ IP::sanitizeRange( $target ), self::TYPE_RANGE ];
1520                 }
1521
1522                 # Consider the possibility that this is not a username at all
1523                 # but actually an old subpage (T31797)
1524                 if ( strpos( $target, '/' ) !== false ) {
1525                         # An old subpage, drill down to the user behind it
1526                         $target = explode( '/', $target )[0];
1527                 }
1528
1529                 $userObj = User::newFromName( $target );
1530                 if ( $userObj instanceof User ) {
1531                         # Note that since numbers are valid usernames, a $target of "12345" will be
1532                         # considered a User.  If you want to pass a block ID, prepend a hash "#12345",
1533                         # since hash characters are not valid in usernames or titles generally.
1534                         return [ $userObj, self::TYPE_USER ];
1535
1536                 } elseif ( preg_match( '/^#\d+$/', $target ) ) {
1537                         # Autoblock reference in the form "#12345"
1538                         return [ substr( $target, 1 ), self::TYPE_AUTO ];
1539
1540                 } else {
1541                         # WTF?
1542                         return [ null, null ];
1543                 }
1544         }
1545
1546         /**
1547          * Get the type of target for this particular block
1548          * @return int Block::TYPE_ constant, will never be TYPE_ID
1549          */
1550         public function getType() {
1551                 return $this->mAuto
1552                         ? self::TYPE_AUTO
1553                         : $this->type;
1554         }
1555
1556         /**
1557          * Get the target and target type for this particular Block.  Note that for autoblocks,
1558          * this returns the unredacted name; frontend functions need to call $block->getRedactedName()
1559          * in this situation.
1560          * @return array [ User|String, Block::TYPE_ constant ]
1561          * @todo FIXME: This should be an integral part of the Block member variables
1562          */
1563         public function getTargetAndType() {
1564                 return [ $this->getTarget(), $this->getType() ];
1565         }
1566
1567         /**
1568          * Get the target for this particular Block.  Note that for autoblocks,
1569          * this returns the unredacted name; frontend functions need to call $block->getRedactedName()
1570          * in this situation.
1571          * @return User|string
1572          */
1573         public function getTarget() {
1574                 return $this->target;
1575         }
1576
1577         /**
1578          * @since 1.19
1579          *
1580          * @return mixed|string
1581          */
1582         public function getExpiry() {
1583                 return $this->mExpiry;
1584         }
1585
1586         /**
1587          * Set the target for this block, and update $this->type accordingly
1588          * @param mixed $target
1589          */
1590         public function setTarget( $target ) {
1591                 list( $this->target, $this->type ) = self::parseTarget( $target );
1592         }
1593
1594         /**
1595          * Get the user who implemented this block
1596          * @return User User object. May name a foreign user.
1597          */
1598         public function getBlocker() {
1599                 return $this->blocker;
1600         }
1601
1602         /**
1603          * Set the user who implemented (or will implement) this block
1604          * @param User|string $user Local User object or username string
1605          */
1606         public function setBlocker( $user ) {
1607                 if ( is_string( $user ) ) {
1608                         $user = User::newFromName( $user, false );
1609                 }
1610
1611                 if ( $user->isAnon() && User::isUsableName( $user->getName() ) ) {
1612                         throw new InvalidArgumentException(
1613                                 'Blocker must be a local user or a name that cannot be a local user'
1614                         );
1615                 }
1616
1617                 $this->blocker = $user;
1618         }
1619
1620         /**
1621          * Set the 'BlockID' cookie to this block's ID and expiry time. The cookie's expiry will be
1622          * the same as the block's, to a maximum of 24 hours.
1623          *
1624          * @since 1.29
1625          *
1626          * @param WebResponse $response The response on which to set the cookie.
1627          */
1628         public function setCookie( WebResponse $response ) {
1629                 // Calculate the default expiry time.
1630                 $maxExpiryTime = wfTimestamp( TS_MW, wfTimestamp() + ( 24 * 60 * 60 ) );
1631
1632                 // Use the Block's expiry time only if it's less than the default.
1633                 $expiryTime = $this->getExpiry();
1634                 if ( $expiryTime === 'infinity' || $expiryTime > $maxExpiryTime ) {
1635                         $expiryTime = $maxExpiryTime;
1636                 }
1637
1638                 // Set the cookie. Reformat the MediaWiki datetime as a Unix timestamp for the cookie.
1639                 $expiryValue = DateTime::createFromFormat( 'YmdHis', $expiryTime )->format( 'U' );
1640                 $cookieOptions = [ 'httpOnly' => false ];
1641                 $cookieValue = $this->getCookieValue();
1642                 $response->setCookie( 'BlockID', $cookieValue, $expiryValue, $cookieOptions );
1643         }
1644
1645         /**
1646          * Unset the 'BlockID' cookie.
1647          *
1648          * @since 1.29
1649          *
1650          * @param WebResponse $response The response on which to unset the cookie.
1651          */
1652         public static function clearCookie( WebResponse $response ) {
1653                 $response->clearCookie( 'BlockID', [ 'httpOnly' => false ] );
1654         }
1655
1656         /**
1657          * Get the BlockID cookie's value for this block. This is usually the block ID concatenated
1658          * with an HMAC in order to avoid spoofing (T152951), but if wgSecretKey is not set will just
1659          * be the block ID.
1660          *
1661          * @since 1.29
1662          *
1663          * @return string The block ID, probably concatenated with "!" and the HMAC.
1664          */
1665         public function getCookieValue() {
1666                 $config = RequestContext::getMain()->getConfig();
1667                 $id = $this->getId();
1668                 $secretKey = $config->get( 'SecretKey' );
1669                 if ( !$secretKey ) {
1670                         // If there's no secret key, don't append a HMAC.
1671                         return $id;
1672                 }
1673                 $hmac = MWCryptHash::hmac( $id, $secretKey, false );
1674                 $cookieValue = $id . '!' . $hmac;
1675                 return $cookieValue;
1676         }
1677
1678         /**
1679          * Get the stored ID from the 'BlockID' cookie. The cookie's value is usually a combination of
1680          * the ID and a HMAC (see Block::setCookie), but will sometimes only be the ID.
1681          *
1682          * @since 1.29
1683          *
1684          * @param string $cookieValue The string in which to find the ID.
1685          *
1686          * @return int|null The block ID, or null if the HMAC is present and invalid.
1687          */
1688         public static function getIdFromCookieValue( $cookieValue ) {
1689                 // Extract the ID prefix from the cookie value (may be the whole value, if no bang found).
1690                 $bangPos = strpos( $cookieValue, '!' );
1691                 $id = ( $bangPos === false ) ? $cookieValue : substr( $cookieValue, 0, $bangPos );
1692                 // Get the site-wide secret key.
1693                 $config = RequestContext::getMain()->getConfig();
1694                 $secretKey = $config->get( 'SecretKey' );
1695                 if ( !$secretKey ) {
1696                         // If there's no secret key, just use the ID as given.
1697                         return $id;
1698                 }
1699                 $storedHmac = substr( $cookieValue, $bangPos + 1 );
1700                 $calculatedHmac = MWCryptHash::hmac( $id, $secretKey, false );
1701                 if ( $calculatedHmac === $storedHmac ) {
1702                         return $id;
1703                 } else {
1704                         return null;
1705                 }
1706         }
1707
1708         /**
1709          * Get the key and parameters for the corresponding error message.
1710          *
1711          * @since 1.22
1712          * @param IContextSource $context
1713          * @return array
1714          */
1715         public function getPermissionsError( IContextSource $context ) {
1716                 $params = $this->getBlockErrorParams( $context );
1717
1718                 $msg = 'blockedtext';
1719                 if ( $this->getSystemBlockType() !== null ) {
1720                         $msg = 'systemblockedtext';
1721                 } elseif ( $this->mAuto ) {
1722                         $msg = 'autoblockedtext';
1723                 } elseif ( !$this->isSitewide() ) {
1724                         $msg = 'blockedtext-partial';
1725                 }
1726
1727                 array_unshift( $params, $msg );
1728
1729                 return $params;
1730         }
1731
1732         /**
1733          * Get block information used in different block error messages
1734          *
1735          * @since 1.33
1736          * @param IContextSource $context
1737          * @return array
1738          */
1739         public function getBlockErrorParams( IContextSource $context ) {
1740                 $blocker = $this->getBlocker();
1741                 if ( $blocker instanceof User ) { // local user
1742                         $blockerUserpage = $blocker->getUserPage();
1743                         $link = "[[{$blockerUserpage->getPrefixedText()}|{$blockerUserpage->getText()}]]";
1744                 } else { // foreign user
1745                         $link = $blocker;
1746                 }
1747
1748                 $reason = $this->mReason;
1749                 if ( $reason == '' ) {
1750                         $reason = $context->msg( 'blockednoreason' )->text();
1751                 }
1752
1753                 /* $ip returns who *is* being blocked, $intended contains who was meant to be blocked.
1754                  * This could be a username, an IP range, or a single IP. */
1755                 $intended = $this->getTarget();
1756                 $systemBlockType = $this->getSystemBlockType();
1757                 $lang = $context->getLanguage();
1758
1759                 return [
1760                         $link,
1761                         $reason,
1762                         $context->getRequest()->getIP(),
1763                         $this->getByName(),
1764                         $systemBlockType ?? $this->getId(),
1765                         $lang->formatExpiry( $this->mExpiry ),
1766                         (string)$intended,
1767                         $lang->userTimeAndDate( $this->mTimestamp, $context->getUser() ),
1768                 ];
1769         }
1770
1771         /**
1772          * Get Restrictions.
1773          *
1774          * Getting the restrictions will perform a database query if the restrictions
1775          * are not already loaded.
1776          *
1777          * @since 1.33
1778          * @return Restriction[]
1779          */
1780         public function getRestrictions() {
1781                 if ( $this->restrictions === null ) {
1782                         // If the block id has not been set, then do not attempt to load the
1783                         // restrictions.
1784                         if ( !$this->mId ) {
1785                                 return [];
1786                         }
1787                         $this->restrictions = BlockRestriction::loadByBlockId( $this->mId );
1788                 }
1789
1790                 return $this->restrictions;
1791         }
1792
1793         /**
1794          * Set Restrictions.
1795          *
1796          * @since 1.33
1797          * @param Restriction[] $restrictions
1798          * @return self
1799          */
1800         public function setRestrictions( array $restrictions ) {
1801                 $this->restrictions = array_filter( $restrictions, function ( $restriction ) {
1802                         return $restriction instanceof Restriction;
1803                 } );
1804
1805                 return $this;
1806         }
1807
1808         /**
1809          * Checks if a block applies to a particular title
1810          *
1811          * This check does not consider whether `$this->prevents( 'editownusertalk' )`
1812          * returns false, as the identity of the user making the hypothetical edit
1813          * isn't known here (particularly in the case of IP hardblocks, range
1814          * blocks, and auto-blocks).
1815          *
1816          * @param Title $title
1817          * @return bool
1818          */
1819         public function appliesToTitle( Title $title ) {
1820                 if ( $this->isSitewide() ) {
1821                         return true;
1822                 }
1823
1824                 $restrictions = $this->getRestrictions();
1825                 foreach ( $restrictions as $restriction ) {
1826                         if ( $restriction->matches( $title ) ) {
1827                                 return true;
1828                         }
1829                 }
1830
1831                 return false;
1832         }
1833
1834         /**
1835          * Checks if a block applies to a particular namespace
1836          *
1837          * @since 1.33
1838          *
1839          * @param int $ns
1840          * @return bool
1841          */
1842         public function appliesToNamespace( $ns ) {
1843                 if ( $this->isSitewide() ) {
1844                         return true;
1845                 }
1846
1847                 // Blocks do not apply to virtual namespaces.
1848                 if ( $ns < 0 ) {
1849                         return false;
1850                 }
1851
1852                 $restriction = $this->findRestriction( NamespaceRestriction::TYPE, $ns );
1853
1854                 return (bool)$restriction;
1855         }
1856
1857         /**
1858          * Checks if a block applies to a particular page
1859          *
1860          * This check does not consider whether `$this->prevents( 'editownusertalk' )`
1861          * returns false, as the identity of the user making the hypothetical edit
1862          * isn't known here (particularly in the case of IP hardblocks, range
1863          * blocks, and auto-blocks).
1864          *
1865          * @since 1.33
1866          *
1867          * @param int $pageId
1868          * @return bool
1869          */
1870         public function appliesToPage( $pageId ) {
1871                 if ( $this->isSitewide() ) {
1872                         return true;
1873                 }
1874
1875                 // If the pageId is not over zero, the block cannot apply to it.
1876                 if ( $pageId <= 0 ) {
1877                         return false;
1878                 }
1879
1880                 $restriction = $this->findRestriction( PageRestriction::TYPE, $pageId );
1881
1882                 return (bool)$restriction;
1883         }
1884
1885         /**
1886          * Find Restriction by type and value.
1887          *
1888          * @param string $type
1889          * @param int $value
1890          * @return Restriction|null
1891          */
1892         private function findRestriction( $type, $value ) {
1893                 $restrictions = $this->getRestrictions();
1894                 foreach ( $restrictions as $restriction ) {
1895                         if ( $restriction->getType() !== $type ) {
1896                                 continue;
1897                         }
1898
1899                         if ( $restriction->getValue() === $value ) {
1900                                 return $restriction;
1901                         }
1902                 }
1903
1904                 return null;
1905         }
1906 }