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 class Block {
  23         /** @var string */
  24         public $mReason;
  25
  26         /** @var string */
  27         public $mTimestamp;
  28
  29         /** @var bool */
  30         public $mAuto;
  31
  32         /** @var string */
  33         public $mExpiry;
  34
  35         /** @var bool */
  36         public $mHideName;
  37
  38         /** @var int */
  39         public $mParentBlockId;
  40
  41         /** @var int */
  42         protected $mId;
  43
  44         /** @var bool */
  45         protected $mFromMaster;
  46
  47         /** @var bool */
  48         protected $mBlockEmail;
  49
  50         /** @var bool */
  51         protected $mDisableUsertalk;
  52
  53         /** @var bool */
  54         protected $mCreateAccount;
  55
  56         /** @var User|string */
  57         protected $target;
  58
  59         /** @var int Hack for foreign blocking (CentralAuth) */
  60         protected $forcedTargetID;
  61
  62         /** @var int Block::TYPE_ constant. Can only be USER, IP or RANGE internally */
  63         protected $type;
  64
  65         /** @var User */
  66         protected $blocker;
  67
  68         /** @var bool */
  69         protected $isHardblock;
  70
  71         /** @var bool */
  72         protected $isAutoblocking;
  73
  74         # TYPE constants
  75         const TYPE_USER = 1;
  76         const TYPE_IP = 2;
  77         const TYPE_RANGE = 3;
  78         const TYPE_AUTO = 4;
  79         const TYPE_ID = 5;
  80
  81         /**
  82          * Create a new block with specified parameters on a user, IP or IP range.
  83          *
  84          * @param array $options Parameters of the block:
  85          *     address string|User  Target user name, User object, IP address or IP range
  86          *     user int             Override target user ID (for foreign users)
  87          *     by int               User ID of the blocker
  88          *     reason string        Reason of the block
  89          *     timestamp string     The time at which the block comes into effect
  90          *     auto bool            Is this an automatic block?
  91          *     expiry string        Timestamp of expiration of the block or 'infinity'
  92          *     anonOnly bool        Only disallow anonymous actions
  93          *     createAccount bool   Disallow creation of new accounts
  94          *     enableAutoblock bool Enable automatic blocking
  95          *     hideName bool        Hide the target user name
  96          *     blockEmail bool      Disallow sending emails
  97          *     allowUsertalk bool   Allow the target to edit its own talk page
  98          *     byText string        Username of the blocker (for foreign users)
  99          *
 100          * @since 1.26 accepts $options array instead of individual parameters; order
 101          * of parameters above reflects the original order
 102          */
 103         function __construct( $options = array() ) {
 104                 $defaults = array(
 105                         'address'         => '',
 106                         'user'            => null,
 107                         'by'              => null,
 108                         'reason'          => '',
 109                         'timestamp'       => '',
 110                         'auto'            => false,
 111                         'expiry'          => '',
 112                         'anonOnly'        => false,
 113                         'createAccount'   => false,
 114                         'enableAutoblock' => false,
 115                         'hideName'        => false,
 116                         'blockEmail'      => false,
 117                         'allowUsertalk'   => false,
 118                         'byText'          => '',
 119                 );
 120
 121                 if ( func_num_args() > 1 || !is_array( $options ) ) {
 122                         $options = array_combine(
 123                                 array_slice( array_keys( $defaults ), 0, func_num_args() ),
 124                                 func_get_args()
 125                         );
 126                         wfDeprecated( __METHOD__ . ' with multiple arguments', '1.26' );
 127                 }
 128
 129                 $options += $defaults;
 130
 131                 $this->setTarget( $options['address'] );
 132
 133                 if ( $this->target instanceof User && $options['user'] ) {
 134                         # Needed for foreign users
 135                         $this->forcedTargetID = $options['user'];
 136                 }
 137
 138                 if ( $options['by'] ) {
 139                         # Local user
 140                         $this->setBlocker( User::newFromID( $options['by'] ) );
 141                 } else {
 142                         # Foreign user
 143                         $this->setBlocker( $options['byText'] );
 144                 }
 145
 146                 $this->mReason = $options['reason'];
 147                 $this->mTimestamp = wfTimestamp( TS_MW, $options['timestamp'] );
 148                 $this->mExpiry = wfGetDB( DB_SLAVE )->decodeExpiry( $options['expiry'] );
 149
 150                 # Boolean settings
 151                 $this->mAuto = (bool)$options['auto'];
 152                 $this->mHideName = (bool)$options['hideName'];
 153                 $this->isHardblock( !$options['anonOnly'] );
 154                 $this->isAutoblocking( (bool)$options['enableAutoblock'] );
 155
 156                 # Prevention measures
 157                 $this->prevents( 'sendemail', (bool)$options['blockEmail'] );
 158                 $this->prevents( 'editownusertalk', !$options['allowUsertalk'] );
 159                 $this->prevents( 'createaccount', (bool)$options['createAccount'] );
 160
 161                 $this->mFromMaster = false;
 162         }
 163
 164         /**
 165          * Load a blocked user from their block id.
 166          *
 167          * @param int $id Block id to search for
 168          * @return Block|null
 169          */
 170         public static function newFromID( $id ) {
 171                 $dbr = wfGetDB( DB_SLAVE );
 172                 $res = $dbr->selectRow(
 173                         'ipblocks',
 174                         self::selectFields(),
 175                         array( 'ipb_id' => $id ),
 176                         __METHOD__
 177                 );
 178                 if ( $res ) {
 179                         return self::newFromRow( $res );
 180                 } else {
 181                         return null;
 182                 }
 183         }
 184
 185         /**
 186          * Return the list of ipblocks fields that should be selected to create
 187          * a new block.
 188          * @return array
 189          */
 190         public static function selectFields() {
 191                 return array(
 192                         'ipb_id',
 193                         'ipb_address',
 194                         'ipb_by',
 195                         'ipb_by_text',
 196                         'ipb_reason',
 197                         'ipb_timestamp',
 198                         'ipb_auto',
 199                         'ipb_anon_only',
 200                         'ipb_create_account',
 201                         'ipb_enable_autoblock',
 202                         'ipb_expiry',
 203                         'ipb_deleted',
 204                         'ipb_block_email',
 205                         'ipb_allow_usertalk',
 206                         'ipb_parent_block_id',
 207                 );
 208         }
 209
 210         /**
 211          * Check if two blocks are effectively equal.  Doesn't check irrelevant things like
 212          * the blocking user or the block timestamp, only things which affect the blocked user
 213          *
 214          * @param Block $block
 215          *
 216          * @return bool
 217          */
 218         public function equals( Block $block ) {
 219                 return (
 220                         (string)$this->target == (string)$block->target
 221                         && $this->type == $block->type
 222                         && $this->mAuto == $block->mAuto
 223                         && $this->isHardblock() == $block->isHardblock()
 224                         && $this->prevents( 'createaccount' ) == $block->prevents( 'createaccount' )
 225                         && $this->mExpiry == $block->mExpiry
 226                         && $this->isAutoblocking() == $block->isAutoblocking()
 227                         && $this->mHideName == $block->mHideName
 228                         && $this->prevents( 'sendemail' ) == $block->prevents( 'sendemail' )
 229                         && $this->prevents( 'editownusertalk' ) == $block->prevents( 'editownusertalk' )
 230                         && $this->mReason == $block->mReason
 231                 );
 232         }
 233
 234         /**
 235          * Load a block from the database which affects the already-set $this->target:
 236          *     1) A block directly on the given user or IP
 237          *     2) A rangeblock encompassing the given IP (smallest first)
 238          *     3) An autoblock on the given IP
 239          * @param User|string $vagueTarget Also search for blocks affecting this target.  Doesn't
 240          *     make any sense to use TYPE_AUTO / TYPE_ID here. Leave blank to skip IP lookups.
 241          * @throws MWException
 242          * @return bool Whether a relevant block was found
 243          */
 244         protected function newLoad( $vagueTarget = null ) {
 245                 $db = wfGetDB( $this->mFromMaster ? DB_MASTER : DB_SLAVE );
 246
 247                 if ( $this->type !== null ) {
 248                         $conds = array(
 249                                 'ipb_address' => array( (string)$this->target ),
 250                         );
 251                 } else {
 252                         $conds = array( 'ipb_address' => array() );
 253                 }
 254
 255                 # Be aware that the != '' check is explicit, since empty values will be
 256                 # passed by some callers (bug 29116)
 257                 if ( $vagueTarget != '' ) {
 258                         list( $target, $type ) = self::parseTarget( $vagueTarget );
 259                         switch ( $type ) {
 260                                 case self::TYPE_USER:
 261                                         # Slightly weird, but who are we to argue?
 262                                         $conds['ipb_address'][] = (string)$target;
 263                                         break;
 264
 265                                 case self::TYPE_IP:
 266                                         $conds['ipb_address'][] = (string)$target;
 267                                         $conds[] = self::getRangeCond( IP::toHex( $target ) );
 268                                         $conds = $db->makeList( $conds, LIST_OR );
 269                                         break;
 270
 271                                 case self::TYPE_RANGE:
 272                                         list( $start, $end ) = IP::parseRange( $target );
 273                                         $conds['ipb_address'][] = (string)$target;
 274                                         $conds[] = self::getRangeCond( $start, $end );
 275                                         $conds = $db->makeList( $conds, LIST_OR );
 276                                         break;
 277
 278                                 default:
 279                                         throw new MWException( "Tried to load block with invalid type" );
 280                         }
 281                 }
 282
 283                 $res = $db->select( 'ipblocks', self::selectFields(), $conds, __METHOD__ );
 284
 285                 # This result could contain a block on the user, a block on the IP, and a russian-doll
 286                 # set of rangeblocks.  We want to choose the most specific one, so keep a leader board.
 287                 $bestRow = null;
 288
 289                 # Lower will be better
 290                 $bestBlockScore = 100;
 291
 292                 # This is begging for $this = $bestBlock, but that's not allowed in PHP :(
 293                 $bestBlockPreventsEdit = null;
 294
 295                 foreach ( $res as $row ) {
 296                         $block = self::newFromRow( $row );
 297
 298                         # Don't use expired blocks
 299                         if ( $block->deleteIfExpired() ) {
 300                                 continue;
 301                         }
 302
 303                         # Don't use anon only blocks on users
 304                         if ( $this->type == self::TYPE_USER && !$block->isHardblock() ) {
 305                                 continue;
 306                         }
 307
 308                         if ( $block->getType() == self::TYPE_RANGE ) {
 309                                 # This is the number of bits that are allowed to vary in the block, give
 310                                 # or take some floating point errors
 311                                 $end = wfBaseconvert( $block->getRangeEnd(), 16, 10 );
 312                                 $start = wfBaseconvert( $block->getRangeStart(), 16, 10 );
 313                                 $size = log( $end - $start + 1, 2 );
 314
 315                                 # This has the nice property that a /32 block is ranked equally with a
 316                                 # single-IP block, which is exactly what it is...
 317                                 $score = self::TYPE_RANGE - 1 + ( $size / 128 );
 318
 319                         } else {
 320                                 $score = $block->getType();
 321                         }
 322
 323                         if ( $score < $bestBlockScore ) {
 324                                 $bestBlockScore = $score;
 325                                 $bestRow = $row;
 326                                 $bestBlockPreventsEdit = $block->prevents( 'edit' );
 327                         }
 328                 }
 329
 330                 if ( $bestRow !== null ) {
 331                         $this->initFromRow( $bestRow );
 332                         $this->prevents( 'edit', $bestBlockPreventsEdit );
 333                         return true;
 334                 } else {
 335                         return false;
 336                 }
 337         }
 338
 339         /**
 340          * Get a set of SQL conditions which will select rangeblocks encompassing a given range
 341          * @param string $start Hexadecimal IP representation
 342          * @param string $end Hexadecimal IP representation, or null to use $start = $end
 343          * @return string
 344          */
 345         public static function getRangeCond( $start, $end = null ) {
 346                 if ( $end === null ) {
 347                         $end = $start;
 348                 }
 349                 # Per bug 14634, we want to include relevant active rangeblocks; for
 350                 # rangeblocks, we want to include larger ranges which enclose the given
 351                 # range. We know that all blocks must be smaller than $wgBlockCIDRLimit,
 352                 # so we can improve performance by filtering on a LIKE clause
 353                 $chunk = self::getIpFragment( $start );
 354                 $dbr = wfGetDB( DB_SLAVE );
 355                 $like = $dbr->buildLike( $chunk, $dbr->anyString() );
 356
 357                 # Fairly hard to make a malicious SQL statement out of hex characters,
 358                 # but stranger things have happened...
 359                 $safeStart = $dbr->addQuotes( $start );
 360                 $safeEnd = $dbr->addQuotes( $end );
 361
 362                 return $dbr->makeList(
 363                         array(
 364                                 "ipb_range_start $like",
 365                                 "ipb_range_start <= $safeStart",
 366                                 "ipb_range_end >= $safeEnd",
 367                         ),
 368                         LIST_AND
 369                 );
 370         }
 371
 372         /**
 373          * Get the component of an IP address which is certain to be the same between an IP
 374          * address and a rangeblock containing that IP address.
 375          * @param string $hex Hexadecimal IP representation
 376          * @return string
 377          */
 378         protected static function getIpFragment( $hex ) {
 379                 global $wgBlockCIDRLimit;
 380                 if ( substr( $hex, 0, 3 ) == 'v6-' ) {
 381                         return 'v6-' . substr( substr( $hex, 3 ), 0, floor( $wgBlockCIDRLimit['IPv6'] / 4 ) );
 382                 } else {
 383                         return substr( $hex, 0, floor( $wgBlockCIDRLimit['IPv4'] / 4 ) );
 384                 }
 385         }
 386
 387         /**
 388          * Given a database row from the ipblocks table, initialize
 389          * member variables
 390          * @param stdClass $row A row from the ipblocks table
 391          */
 392         protected function initFromRow( $row ) {
 393                 $this->setTarget( $row->ipb_address );
 394                 if ( $row->ipb_by ) { // local user
 395                         $this->setBlocker( User::newFromId( $row->ipb_by ) );
 396                 } else { // foreign user
 397                         $this->setBlocker( $row->ipb_by_text );
 398                 }
 399
 400                 $this->mReason = $row->ipb_reason;
 401                 $this->mTimestamp = wfTimestamp( TS_MW, $row->ipb_timestamp );
 402                 $this->mAuto = $row->ipb_auto;
 403                 $this->mHideName = $row->ipb_deleted;
 404                 $this->mId = (int)$row->ipb_id;
 405                 $this->mParentBlockId = $row->ipb_parent_block_id;
 406
 407                 // I wish I didn't have to do this
 408                 $this->mExpiry = wfGetDB( DB_SLAVE )->decodeExpiry( $row->ipb_expiry );
 409
 410                 $this->isHardblock( !$row->ipb_anon_only );
 411                 $this->isAutoblocking( $row->ipb_enable_autoblock );
 412
 413                 $this->prevents( 'createaccount', $row->ipb_create_account );
 414                 $this->prevents( 'sendemail', $row->ipb_block_email );
 415                 $this->prevents( 'editownusertalk', !$row->ipb_allow_usertalk );
 416         }
 417
 418         /**
 419          * Create a new Block object from a database row
 420          * @param stdClass $row Row from the ipblocks table
 421          * @return Block
 422          */
 423         public static function newFromRow( $row ) {
 424                 $block = new Block;
 425                 $block->initFromRow( $row );
 426                 return $block;
 427         }
 428
 429         /**
 430          * Delete the row from the IP blocks table.
 431          *
 432          * @throws MWException
 433          * @return bool
 434          */
 435         public function delete() {
 436                 if ( wfReadOnly() ) {
 437                         return false;
 438                 }
 439
 440                 if ( !$this->getId() ) {
 441                         throw new MWException( "Block::delete() requires that the mId member be filled\n" );
 442                 }
 443
 444                 $dbw = wfGetDB( DB_MASTER );
 445                 $dbw->delete( 'ipblocks', array( 'ipb_parent_block_id' => $this->getId() ), __METHOD__ );
 446                 $dbw->delete( 'ipblocks', array( 'ipb_id' => $this->getId() ), __METHOD__ );
 447
 448                 return $dbw->affectedRows() > 0;
 449         }
 450
 451         /**
 452          * Insert a block into the block table. Will fail if there is a conflicting
 453          * block (same name and options) already in the database.
 454          *
 455          * @param IDatabase $dbw If you have one available
 456          * @return bool|array False on failure, assoc array on success:
 457          *      ('id' => block ID, 'autoIds' => array of autoblock IDs)
 458          */
 459         public function insert( $dbw = null ) {
 460                 wfDebug( "Block::insert; timestamp {$this->mTimestamp}\n" );
 461
 462                 if ( $dbw === null ) {
 463                         $dbw = wfGetDB( DB_MASTER );
 464                 }
 465
 466                 # Periodic purge via commit hooks
 467                 if ( mt_rand( 0, 9 ) == 0 ) {
 468                         Block::purgeExpired();
 469                 }
 470
 471                 $row = $this->getDatabaseArray();
 472                 $row['ipb_id'] = $dbw->nextSequenceValue( "ipblocks_ipb_id_seq" );
 473
 474                 $dbw->insert( 'ipblocks', $row, __METHOD__, array( 'IGNORE' ) );
 475                 $affected = $dbw->affectedRows();
 476                 $this->mId = $dbw->insertId();
 477
 478                 # Don't collide with expired blocks.
 479                 # Do this after trying to insert to avoid locking.
 480                 if ( !$affected ) {
 481                         # T96428: The ipb_address index uses a prefix on a field, so
 482                         # use a standard SELECT + DELETE to avoid annoying gap locks.
 483                         $ids = $dbw->selectFieldValues( 'ipblocks',
 484                                 'ipb_id',
 485                                 array(
 486                                         'ipb_address' => $row['ipb_address'],
 487                                         'ipb_user' => $row['ipb_user'],
 488                                         'ipb_expiry < ' . $dbw->addQuotes( $dbw->timestamp() )
 489                                 ),
 490                                 __METHOD__
 491                         );
 492                         if ( $ids ) {
 493                                 $dbw->delete( 'ipblocks', array( 'ipb_id' => $ids ), __METHOD__ );
 494                                 $dbw->insert( 'ipblocks', $row, __METHOD__, array( 'IGNORE' ) );
 495                                 $affected = $dbw->affectedRows();
 496                                 $this->mId = $dbw->insertId();
 497                         }
 498                 }
 499
 500                 if ( $affected ) {
 501                         $auto_ipd_ids = $this->doRetroactiveAutoblock();
 502                         return array( 'id' => $this->mId, 'autoIds' => $auto_ipd_ids );
 503                 }
 504
 505                 return false;
 506         }
 507
 508         /**
 509          * Update a block in the DB with new parameters.
 510          * The ID field needs to be loaded first.
 511          *
 512          * @return bool|array False on failure, array on success:
 513          *   ('id' => block ID, 'autoIds' => array of autoblock IDs)
 514          */
 515         public function update() {
 516                 wfDebug( "Block::update; timestamp {$this->mTimestamp}\n" );
 517                 $dbw = wfGetDB( DB_MASTER );
 518
 519                 $dbw->startAtomic( __METHOD__ );
 520
 521                 $dbw->update(
 522                         'ipblocks',
 523                         $this->getDatabaseArray( $dbw ),
 524                         array( 'ipb_id' => $this->getId() ),
 525                         __METHOD__
 526                 );
 527
 528                 $affected = $dbw->affectedRows();
 529
 530                 if ( $this->isAutoblocking() ) {
 531                         // update corresponding autoblock(s) (bug 48813)
 532                         $dbw->update(
 533                                 'ipblocks',
 534                                 $this->getAutoblockUpdateArray(),
 535                                 array( 'ipb_parent_block_id' => $this->getId() ),
 536                                 __METHOD__
 537                         );
 538                 } else {
 539                         // autoblock no longer required, delete corresponding autoblock(s)
 540                         $dbw->delete(
 541                                 'ipblocks',
 542                                 array( 'ipb_parent_block_id' => $this->getId() ),
 543                                 __METHOD__
 544                         );
 545                 }
 546
 547                 $dbw->endAtomic( __METHOD__ );
 548
 549                 if ( $affected ) {
 550                         $auto_ipd_ids = $this->doRetroactiveAutoblock();
 551                         return array( 'id' => $this->mId, 'autoIds' => $auto_ipd_ids );
 552                 }
 553
 554                 return false;
 555         }
 556
 557         /**
 558          * Get an array suitable for passing to $dbw->insert() or $dbw->update()
 559          * @param IDatabase $db
 560          * @return array
 561          */
 562         protected function getDatabaseArray( $db = null ) {
 563                 if ( !$db ) {
 564                         $db = wfGetDB( DB_SLAVE );
 565                 }
 566                 $expiry = $db->encodeExpiry( $this->mExpiry );
 567
 568                 if ( $this->forcedTargetID ) {
 569                         $uid = $this->forcedTargetID;
 570                 } else {
 571                         $uid = $this->target instanceof User ? $this->target->getID() : 0;
 572                 }
 573
 574                 $a = array(
 575                         'ipb_address'          => (string)$this->target,
 576                         'ipb_user'             => $uid,
 577                         'ipb_by'               => $this->getBy(),
 578                         'ipb_by_text'          => $this->getByName(),
 579                         'ipb_reason'           => $this->mReason,
 580                         'ipb_timestamp'        => $db->timestamp( $this->mTimestamp ),
 581                         'ipb_auto'             => $this->mAuto,
 582                         'ipb_anon_only'        => !$this->isHardblock(),
 583                         'ipb_create_account'   => $this->prevents( 'createaccount' ),
 584                         'ipb_enable_autoblock' => $this->isAutoblocking(),
 585                         'ipb_expiry'           => $expiry,
 586                         'ipb_range_start'      => $this->getRangeStart(),
 587                         'ipb_range_end'        => $this->getRangeEnd(),
 588                         'ipb_deleted'          => intval( $this->mHideName ), // typecast required for SQLite
 589                         'ipb_block_email'      => $this->prevents( 'sendemail' ),
 590                         'ipb_allow_usertalk'   => !$this->prevents( 'editownusertalk' ),
 591                         'ipb_parent_block_id'  => $this->mParentBlockId
 592                 );
 593
 594                 return $a;
 595         }
 596
 597         /**
 598          * @return array
 599          */
 600         protected function getAutoblockUpdateArray() {
 601                 return array(
 602                         'ipb_by'               => $this->getBy(),
 603                         'ipb_by_text'          => $this->getByName(),
 604                         'ipb_reason'           => $this->mReason,
 605                         'ipb_create_account'   => $this->prevents( 'createaccount' ),
 606                         'ipb_deleted'          => (int)$this->mHideName, // typecast required for SQLite
 607                         'ipb_allow_usertalk'   => !$this->prevents( 'editownusertalk' ),
 608                 );
 609         }
 610
 611         /**
 612          * Retroactively autoblocks the last IP used by the user (if it is a user)
 613          * blocked by this Block.
 614          *
 615          * @return array Block IDs of retroactive autoblocks made
 616          */
 617         protected function doRetroactiveAutoblock() {
 618                 $blockIds = array();
 619                 # If autoblock is enabled, autoblock the LAST IP(s) used
 620                 if ( $this->isAutoblocking() && $this->getType() == self::TYPE_USER ) {
 621                         wfDebug( "Doing retroactive autoblocks for " . $this->getTarget() . "\n" );
 622
 623                         $continue = Hooks::run(
 624                                 'PerformRetroactiveAutoblock', array( $this, &$blockIds ) );
 625
 626                         if ( $continue ) {
 627                                 self::defaultRetroactiveAutoblock( $this, $blockIds );
 628                         }
 629                 }
 630                 return $blockIds;
 631         }
 632
 633         /**
 634          * Retroactively autoblocks the last IP used by the user (if it is a user)
 635          * blocked by this Block. This will use the recentchanges table.
 636          *
 637          * @param Block $block
 638          * @param array &$blockIds
 639          */
 640         protected static function defaultRetroactiveAutoblock( Block $block, array &$blockIds ) {
 641                 global $wgPutIPinRC;
 642
 643                 // No IPs are in recentchanges table, so nothing to select
 644                 if ( !$wgPutIPinRC ) {
 645                         return;
 646                 }
 647
 648                 $dbr = wfGetDB( DB_SLAVE );
 649
 650                 $options = array( 'ORDER BY' => 'rc_timestamp DESC' );
 651                 $conds = array( 'rc_user_text' => (string)$block->getTarget() );
 652
 653                 // Just the last IP used.
 654                 $options['LIMIT'] = 1;
 655
 656                 $res = $dbr->select( 'recentchanges', array( 'rc_ip' ), $conds,
 657                         __METHOD__, $options );
 658
 659                 if ( !$res->numRows() ) {
 660                         # No results, don't autoblock anything
 661                         wfDebug( "No IP found to retroactively autoblock\n" );
 662                 } else {
 663                         foreach ( $res as $row ) {
 664                                 if ( $row->rc_ip ) {
 665                                         $id = $block->doAutoblock( $row->rc_ip );
 666                                         if ( $id ) {
 667                                                 $blockIds[] = $id;
 668                                         }
 669                                 }
 670                         }
 671                 }
 672         }
 673
 674         /**
 675          * Checks whether a given IP is on the autoblock whitelist.
 676          * TODO: this probably belongs somewhere else, but not sure where...
 677          *
 678          * @param string $ip The IP to check
 679          * @return bool
 680          */
 681         public static function isWhitelistedFromAutoblocks( $ip ) {
 682                 // Try to get the autoblock_whitelist from the cache, as it's faster
 683                 // than getting the msg raw and explode()'ing it.
 684                 $cache = ObjectCache::getMainWANInstance();
 685                 $lines = $cache->getWithSetCallback(
 686                         wfMemcKey( 'ipb', 'autoblock', 'whitelist' ),
 687                         $cache::TTL_DAY,
 688                         function () {
 689                                 return explode( "\n",
 690                                         wfMessage( 'autoblock_whitelist' )->inContentLanguage()->plain() );
 691                         }
 692                 );
 693
 694                 wfDebug( "Checking the autoblock whitelist..\n" );
 695
 696                 foreach ( $lines as $line ) {
 697                         # List items only
 698                         if ( substr( $line, 0, 1 ) !== '*' ) {
 699                                 continue;
 700                         }
 701
 702                         $wlEntry = substr( $line, 1 );
 703                         $wlEntry = trim( $wlEntry );
 704
 705                         wfDebug( "Checking $ip against $wlEntry..." );
 706
 707                         # Is the IP in this range?
 708                         if ( IP::isInRange( $ip, $wlEntry ) ) {
 709                                 wfDebug( " IP $ip matches $wlEntry, not autoblocking\n" );
 710                                 return true;
 711                         } else {
 712                                 wfDebug( " No match\n" );
 713                         }
 714                 }
 715
 716                 return false;
 717         }
 718
 719         /**
 720          * Autoblocks the given IP, referring to this Block.
 721          *
 722          * @param string $autoblockIP The IP to autoblock.
 723          * @return int|bool Block ID if an autoblock was inserted, false if not.
 724          */
 725         public function doAutoblock( $autoblockIP ) {
 726                 # If autoblocks are disabled, go away.
 727                 if ( !$this->isAutoblocking() ) {
 728                         return false;
 729                 }
 730
 731                 # Check for presence on the autoblock whitelist.
 732                 if ( self::isWhitelistedFromAutoblocks( $autoblockIP ) ) {
 733                         return false;
 734                 }
 735
 736                 # Allow hooks to cancel the autoblock.
 737                 if ( !Hooks::run( 'AbortAutoblock', array( $autoblockIP, &$this ) ) ) {
 738                         wfDebug( "Autoblock aborted by hook.\n" );
 739                         return false;
 740                 }
 741
 742                 # It's okay to autoblock. Go ahead and insert/update the block...
 743
 744                 # Do not add a *new* block if the IP is already blocked.
 745                 $ipblock = Block::newFromTarget( $autoblockIP );
 746                 if ( $ipblock ) {
 747                         # Check if the block is an autoblock and would exceed the user block
 748                         # if renewed. If so, do nothing, otherwise prolong the block time...
 749                         if ( $ipblock->mAuto && // @todo Why not compare $ipblock->mExpiry?
 750                                 $this->mExpiry > Block::getAutoblockExpiry( $ipblock->mTimestamp )
 751                         ) {
 752                                 # Reset block timestamp to now and its expiry to
 753                                 # $wgAutoblockExpiry in the future
 754                                 $ipblock->updateTimestamp();
 755                         }
 756                         return false;
 757                 }
 758
 759                 # Make a new block object with the desired properties.
 760                 $autoblock = new Block;
 761                 wfDebug( "Autoblocking {$this->getTarget()}@" . $autoblockIP . "\n" );
 762                 $autoblock->setTarget( $autoblockIP );
 763                 $autoblock->setBlocker( $this->getBlocker() );
 764                 $autoblock->mReason = wfMessage( 'autoblocker', $this->getTarget(), $this->mReason )
 765                         ->inContentLanguage()->plain();
 766                 $timestamp = wfTimestampNow();
 767                 $autoblock->mTimestamp = $timestamp;
 768                 $autoblock->mAuto = 1;
 769                 $autoblock->prevents( 'createaccount', $this->prevents( 'createaccount' ) );
 770                 # Continue suppressing the name if needed
 771                 $autoblock->mHideName = $this->mHideName;
 772                 $autoblock->prevents( 'editownusertalk', $this->prevents( 'editownusertalk' ) );
 773                 $autoblock->mParentBlockId = $this->mId;
 774
 775                 if ( $this->mExpiry == 'infinity' ) {
 776                         # Original block was indefinite, start an autoblock now
 777                         $autoblock->mExpiry = Block::getAutoblockExpiry( $timestamp );
 778                 } else {
 779                         # If the user is already blocked with an expiry date, we don't
 780                         # want to pile on top of that.
 781                         $autoblock->mExpiry = min( $this->mExpiry, Block::getAutoblockExpiry( $timestamp ) );
 782                 }
 783
 784                 # Insert the block...
 785                 $status = $autoblock->insert();
 786                 return $status
 787                         ? $status['id']
 788                         : false;
 789         }
 790
 791         /**
 792          * Check if a block has expired. Delete it if it is.
 793          * @return bool
 794          */
 795         public function deleteIfExpired() {
 796
 797                 if ( $this->isExpired() ) {
 798                         wfDebug( "Block::deleteIfExpired() -- deleting\n" );
 799                         $this->delete();
 800                         $retVal = true;
 801                 } else {
 802                         wfDebug( "Block::deleteIfExpired() -- not expired\n" );
 803                         $retVal = false;
 804                 }
 805
 806                 return $retVal;
 807         }
 808
 809         /**
 810          * Has the block expired?
 811          * @return bool
 812          */
 813         public function isExpired() {
 814                 $timestamp = wfTimestampNow();
 815                 wfDebug( "Block::isExpired() checking current " . $timestamp . " vs $this->mExpiry\n" );
 816
 817                 if ( !$this->mExpiry ) {
 818                         return false;
 819                 } else {
 820                         return $timestamp > $this->mExpiry;
 821                 }
 822         }
 823
 824         /**
 825          * Is the block address valid (i.e. not a null string?)
 826          * @return bool
 827          */
 828         public function isValid() {
 829                 return $this->getTarget() != null;
 830         }
 831
 832         /**
 833          * Update the timestamp on autoblocks.
 834          */
 835         public function updateTimestamp() {
 836                 if ( $this->mAuto ) {
 837                         $this->mTimestamp = wfTimestamp();
 838                         $this->mExpiry = Block::getAutoblockExpiry( $this->mTimestamp );
 839
 840                         $dbw = wfGetDB( DB_MASTER );
 841                         $dbw->update( 'ipblocks',
 842                                 array( /* SET */
 843                                         'ipb_timestamp' => $dbw->timestamp( $this->mTimestamp ),
 844                                         'ipb_expiry' => $dbw->timestamp( $this->mExpiry ),
 845                                 ),
 846                                 array( /* WHERE */
 847                                         'ipb_address' => (string)$this->getTarget()
 848                                 ),
 849                                 __METHOD__
 850                         );
 851                 }
 852         }
 853
 854         /**
 855          * Get the IP address at the start of the range in Hex form
 856          * @throws MWException
 857          * @return string IP in Hex form
 858          */
 859         public function getRangeStart() {
 860                 switch ( $this->type ) {
 861                         case self::TYPE_USER:
 862                                 return '';
 863                         case self::TYPE_IP:
 864                                 return IP::toHex( $this->target );
 865                         case self::TYPE_RANGE:
 866                                 list( $start, /*...*/ ) = IP::parseRange( $this->target );
 867                                 return $start;
 868                         default:
 869                                 throw new MWException( "Block with invalid type" );
 870                 }
 871         }
 872
 873         /**
 874          * Get the IP address at the end of the range in Hex form
 875          * @throws MWException
 876          * @return string IP in Hex form
 877          */
 878         public function getRangeEnd() {
 879                 switch ( $this->type ) {
 880                         case self::TYPE_USER:
 881                                 return '';
 882                         case self::TYPE_IP:
 883                                 return IP::toHex( $this->target );
 884                         case self::TYPE_RANGE:
 885                                 list( /*...*/, $end ) = IP::parseRange( $this->target );
 886                                 return $end;
 887                         default:
 888                                 throw new MWException( "Block with invalid type" );
 889                 }
 890         }
 891
 892         /**
 893          * Get the user id of the blocking sysop
 894          *
 895          * @return int (0 for foreign users)
 896          */
 897         public function getBy() {
 898                 $blocker = $this->getBlocker();
 899                 return ( $blocker instanceof User )
 900                         ? $blocker->getId()
 901                         : 0;
 902         }
 903
 904         /**
 905          * Get the username of the blocking sysop
 906          *
 907          * @return string
 908          */
 909         public function getByName() {
 910                 $blocker = $this->getBlocker();
 911                 return ( $blocker instanceof User )
 912                         ? $blocker->getName()
 913                         : (string)$blocker; // username
 914         }
 915
 916         /**
 917          * Get the block ID
 918          * @return int
 919          */
 920         public function getId() {
 921                 return $this->mId;
 922         }
 923
 924         /**
 925          * Get/set a flag determining whether the master is used for reads
 926          *
 927          * @param bool|null $x
 928          * @return bool
 929          */
 930         public function fromMaster( $x = null ) {
 931                 return wfSetVar( $this->mFromMaster, $x );
 932         }
 933
 934         /**
 935          * Get/set whether the Block is a hardblock (affects logged-in users on a given IP/range)
 936          * @param bool|null $x
 937          * @return bool
 938          */
 939         public function isHardblock( $x = null ) {
 940                 wfSetVar( $this->isHardblock, $x );
 941
 942                 # You can't *not* hardblock a user
 943                 return $this->getType() == self::TYPE_USER
 944                         ? true
 945                         : $this->isHardblock;
 946         }
 947
 948         /**
 949          * @param null|bool $x
 950          * @return bool
 951          */
 952         public function isAutoblocking( $x = null ) {
 953                 wfSetVar( $this->isAutoblocking, $x );
 954
 955                 # You can't put an autoblock on an IP or range as we don't have any history to
 956                 # look over to get more IPs from
 957                 return $this->getType() == self::TYPE_USER
 958                         ? $this->isAutoblocking
 959                         : false;
 960         }
 961
 962         /**
 963          * Get/set whether the Block prevents a given action
 964          * @param string $action
 965          * @param bool|null $x
 966          * @return bool
 967          */
 968         public function prevents( $action, $x = null ) {
 969                 switch ( $action ) {
 970                         case 'edit':
 971                                 # For now... <evil laugh>
 972                                 return true;
 973
 974                         case 'createaccount':
 975                                 return wfSetVar( $this->mCreateAccount, $x );
 976
 977                         case 'sendemail':
 978                                 return wfSetVar( $this->mBlockEmail, $x );
 979
 980                         case 'editownusertalk':
 981                                 return wfSetVar( $this->mDisableUsertalk, $x );
 982
 983                         default:
 984                                 return null;
 985                 }
 986         }
 987
 988         /**
 989          * Get the block name, but with autoblocked IPs hidden as per standard privacy policy
 990          * @return string Text is escaped
 991          */
 992         public function getRedactedName() {
 993                 if ( $this->mAuto ) {
 994                         return Html::rawElement(
 995                                 'span',
 996                                 array( 'class' => 'mw-autoblockid' ),
 997                                 wfMessage( 'autoblockid', $this->mId )
 998                         );
 999                 } else {
1000                         return htmlspecialchars( $this->getTarget() );
1001                 }
1002         }
1003
1004         /**
1005          * Get a timestamp of the expiry for autoblocks
1006          *
1007          * @param string|int $timestamp
1008          * @return string
1009          */
1010         public static function getAutoblockExpiry( $timestamp ) {
1011                 global $wgAutoblockExpiry;
1012
1013                 return wfTimestamp( TS_MW, wfTimestamp( TS_UNIX, $timestamp ) + $wgAutoblockExpiry );
1014         }
1015
1016         /**
1017          * Purge expired blocks from the ipblocks table
1018          */
1019         public static function purgeExpired() {
1020                 if ( wfReadOnly() ) {
1021                         return;
1022                 }
1023
1024                 $method = __METHOD__;
1025                 $dbw = wfGetDB( DB_MASTER );
1026                 $dbw->onTransactionIdle( function () use ( $dbw, $method ) {
1027                         $dbw->delete( 'ipblocks',
1028                                 array( 'ipb_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ), $method );
1029                 } );
1030         }
1031
1032         /**
1033          * Given a target and the target's type, get an existing Block object if possible.
1034          * @param string|User|int $specificTarget A block target, which may be one of several types:
1035          *     * A user to block, in which case $target will be a User
1036          *     * An IP to block, in which case $target will be a User generated by using
1037          *       User::newFromName( $ip, false ) to turn off name validation
1038          *     * An IP range, in which case $target will be a String "123.123.123.123/18" etc
1039          *     * The ID of an existing block, in the format "#12345" (since pure numbers are valid
1040          *       usernames
1041          *     Calling this with a user, IP address or range will not select autoblocks, and will
1042          *     only select a block where the targets match exactly (so looking for blocks on
1043          *     1.2.3.4 will not select 1.2.0.0/16 or even 1.2.3.4/32)
1044          * @param string|User|int $vagueTarget As above, but we will search for *any* block which
1045          *     affects that target (so for an IP address, get ranges containing that IP; and also
1046          *     get any relevant autoblocks). Leave empty or blank to skip IP-based lookups.
1047          * @param bool $fromMaster Whether to use the DB_MASTER database
1048          * @return Block|null (null if no relevant block could be found).  The target and type
1049          *     of the returned Block will refer to the actual block which was found, which might
1050          *     not be the same as the target you gave if you used $vagueTarget!
1051          */
1052         public static function newFromTarget( $specificTarget, $vagueTarget = null, $fromMaster = false ) {
1053
1054                 list( $target, $type ) = self::parseTarget( $specificTarget );
1055                 if ( $type == Block::TYPE_ID || $type == Block::TYPE_AUTO ) {
1056                         return Block::newFromID( $target );
1057
1058                 } elseif ( $target === null && $vagueTarget == '' ) {
1059                         # We're not going to find anything useful here
1060                         # Be aware that the == '' check is explicit, since empty values will be
1061                         # passed by some callers (bug 29116)
1062                         return null;
1063
1064                 } elseif ( in_array(
1065                         $type,
1066                         array( Block::TYPE_USER, Block::TYPE_IP, Block::TYPE_RANGE, null ) )
1067                 ) {
1068                         $block = new Block();
1069                         $block->fromMaster( $fromMaster );
1070
1071                         if ( $type !== null ) {
1072                                 $block->setTarget( $target );
1073                         }
1074
1075                         if ( $block->newLoad( $vagueTarget ) ) {
1076                                 return $block;
1077                         }
1078                 }
1079                 return null;
1080         }
1081
1082         /**
1083          * Get all blocks that match any IP from an array of IP addresses
1084          *
1085          * @param array $ipChain List of IPs (strings), usually retrieved from the
1086          *         X-Forwarded-For header of the request
1087          * @param bool $isAnon Exclude anonymous-only blocks if false
1088          * @param bool $fromMaster Whether to query the master or slave database
1089          * @return array Array of Blocks
1090          * @since 1.22
1091          */
1092         public static function getBlocksForIPList( array $ipChain, $isAnon, $fromMaster = false ) {
1093                 if ( !count( $ipChain ) ) {
1094                         return array();
1095                 }
1096
1097                 $conds = array();
1098                 foreach ( array_unique( $ipChain ) as $ipaddr ) {
1099                         # Discard invalid IP addresses. Since XFF can be spoofed and we do not
1100                         # necessarily trust the header given to us, make sure that we are only
1101                         # checking for blocks on well-formatted IP addresses (IPv4 and IPv6).
1102                         # Do not treat private IP spaces as special as it may be desirable for wikis
1103                         # to block those IP ranges in order to stop misbehaving proxies that spoof XFF.
1104                         if ( !IP::isValid( $ipaddr ) ) {
1105                                 continue;
1106                         }
1107                         # Don't check trusted IPs (includes local squids which will be in every request)
1108                         if ( IP::isTrustedProxy( $ipaddr ) ) {
1109                                 continue;
1110                         }
1111                         # Check both the original IP (to check against single blocks), as well as build
1112                         # the clause to check for rangeblocks for the given IP.
1113                         $conds['ipb_address'][] = $ipaddr;
1114                         $conds[] = self::getRangeCond( IP::toHex( $ipaddr ) );
1115                 }
1116
1117                 if ( !count( $conds ) ) {
1118                         return array();
1119                 }
1120
1121                 if ( $fromMaster ) {
1122                         $db = wfGetDB( DB_MASTER );
1123                 } else {
1124                         $db = wfGetDB( DB_SLAVE );
1125                 }
1126                 $conds = $db->makeList( $conds, LIST_OR );
1127                 if ( !$isAnon ) {
1128                         $conds = array( $conds, 'ipb_anon_only' => 0 );
1129                 }
1130                 $selectFields = array_merge(
1131                         array( 'ipb_range_start', 'ipb_range_end' ),
1132                         Block::selectFields()
1133                 );
1134                 $rows = $db->select( 'ipblocks',
1135                         $selectFields,
1136                         $conds,
1137                         __METHOD__
1138                 );
1139
1140                 $blocks = array();
1141                 foreach ( $rows as $row ) {
1142                         $block = self::newFromRow( $row );
1143                         if ( !$block->deleteIfExpired() ) {
1144                                 $blocks[] = $block;
1145                         }
1146                 }
1147
1148                 return $blocks;
1149         }
1150
1151         /**
1152          * From a list of multiple blocks, find the most exact and strongest Block.
1153          *
1154          * The logic for finding the "best" block is:
1155          *  - Blocks that match the block's target IP are preferred over ones in a range
1156          *  - Hardblocks are chosen over softblocks that prevent account creation
1157          *  - Softblocks that prevent account creation are chosen over other softblocks
1158          *  - Other softblocks are chosen over autoblocks
1159          *  - If there are multiple exact or range blocks at the same level, the one chosen
1160          *    is random
1161          * This should be used when $blocks where retrieved from the user's IP address
1162          * and $ipChain is populated from the same IP address information.
1163          *
1164          * @param array $blocks Array of Block objects
1165          * @param array $ipChain List of IPs (strings). This is used to determine how "close"
1166          *        a block is to the server, and if a block matches exactly, or is in a range.
1167          *        The order is furthest from the server to nearest e.g., (Browser, proxy1, proxy2,
1168          *        local-squid, ...)
1169          * @throws MWException
1170          * @return Block|null The "best" block from the list
1171          */
1172         public static function chooseBlock( array $blocks, array $ipChain ) {
1173                 if ( !count( $blocks ) ) {
1174                         return null;
1175                 } elseif ( count( $blocks ) == 1 ) {
1176                         return $blocks[0];
1177                 }
1178
1179                 // Sort hard blocks before soft ones and secondarily sort blocks
1180                 // that disable account creation before those that don't.
1181                 usort( $blocks, function ( Block $a, Block $b ) {
1182                         $aWeight = (int)$a->isHardblock() . (int)$a->prevents( 'createaccount' );
1183                         $bWeight = (int)$b->isHardblock() . (int)$b->prevents( 'createaccount' );
1184                         return strcmp( $bWeight, $aWeight ); // highest weight first
1185                 } );
1186
1187                 $blocksListExact = array(
1188                         'hard' => false,
1189                         'disable_create' => false,
1190                         'other' => false,
1191                         'auto' => false
1192                 );
1193                 $blocksListRange = array(
1194                         'hard' => false,
1195                         'disable_create' => false,
1196                         'other' => false,
1197                         'auto' => false
1198                 );
1199                 $ipChain = array_reverse( $ipChain );
1200
1201                 /** @var Block $block */
1202                 foreach ( $blocks as $block ) {
1203                         // Stop searching if we have already have a "better" block. This
1204                         // is why the order of the blocks matters
1205                         if ( !$block->isHardblock() && $blocksListExact['hard'] ) {
1206                                 break;
1207                         } elseif ( !$block->prevents( 'createaccount' ) && $blocksListExact['disable_create'] ) {
1208                                 break;
1209                         }
1210
1211                         foreach ( $ipChain as $checkip ) {
1212                                 $checkipHex = IP::toHex( $checkip );
1213                                 if ( (string)$block->getTarget() === $checkip ) {
1214                                         if ( $block->isHardblock() ) {
1215                                                 $blocksListExact['hard'] = $blocksListExact['hard'] ?: $block;
1216                                         } elseif ( $block->prevents( 'createaccount' ) ) {
1217                                                 $blocksListExact['disable_create'] = $blocksListExact['disable_create'] ?: $block;
1218                                         } elseif ( $block->mAuto ) {
1219                                                 $blocksListExact['auto'] = $blocksListExact['auto'] ?: $block;
1220                                         } else {
1221                                                 $blocksListExact['other'] = $blocksListExact['other'] ?: $block;
1222                                         }
1223                                         // We found closest exact match in the ip list, so go to the next Block
1224                                         break;
1225                                 } elseif ( array_filter( $blocksListExact ) == array()
1226                                         && $block->getRangeStart() <= $checkipHex
1227                                         && $block->getRangeEnd() >= $checkipHex
1228                                 ) {
1229                                         if ( $block->isHardblock() ) {
1230                                                 $blocksListRange['hard'] = $blocksListRange['hard'] ?: $block;
1231                                         } elseif ( $block->prevents( 'createaccount' ) ) {
1232                                                 $blocksListRange['disable_create'] = $blocksListRange['disable_create'] ?: $block;
1233                                         } elseif ( $block->mAuto ) {
1234                                                 $blocksListRange['auto'] = $blocksListRange['auto'] ?: $block;
1235                                         } else {
1236                                                 $blocksListRange['other'] = $blocksListRange['other'] ?: $block;
1237                                         }
1238                                         break;
1239                                 }
1240                         }
1241                 }
1242
1243                 if ( array_filter( $blocksListExact ) == array() ) {
1244                         $blocksList = &$blocksListRange;
1245                 } else {
1246                         $blocksList = &$blocksListExact;
1247                 }
1248
1249                 $chosenBlock = null;
1250                 if ( $blocksList['hard'] ) {
1251                         $chosenBlock = $blocksList['hard'];
1252                 } elseif ( $blocksList['disable_create'] ) {
1253                         $chosenBlock = $blocksList['disable_create'];
1254                 } elseif ( $blocksList['other'] ) {
1255                         $chosenBlock = $blocksList['other'];
1256                 } elseif ( $blocksList['auto'] ) {
1257                         $chosenBlock = $blocksList['auto'];
1258                 } else {
1259                         throw new MWException( "Proxy block found, but couldn't be classified." );
1260                 }
1261
1262                 return $chosenBlock;
1263         }
1264
1265         /**
1266          * From an existing Block, get the target and the type of target.
1267          * Note that, except for null, it is always safe to treat the target
1268          * as a string; for User objects this will return User::__toString()
1269          * which in turn gives User::getName().
1270          *
1271          * @param string|int|User|null $target
1272          * @return array( User|String|null, Block::TYPE_ constant|null )
1273          */
1274         public static function parseTarget( $target ) {
1275                 # We may have been through this before
1276                 if ( $target instanceof User ) {
1277                         if ( IP::isValid( $target->getName() ) ) {
1278                                 return array( $target, self::TYPE_IP );
1279                         } else {
1280                                 return array( $target, self::TYPE_USER );
1281                         }
1282                 } elseif ( $target === null ) {
1283                         return array( null, null );
1284                 }
1285
1286                 $target = trim( $target );
1287
1288                 if ( IP::isValid( $target ) ) {
1289                         # We can still create a User if it's an IP address, but we need to turn
1290                         # off validation checking (which would exclude IP addresses)
1291                         return array(
1292                                 User::newFromName( IP::sanitizeIP( $target ), false ),
1293                                 Block::TYPE_IP
1294                         );
1295
1296                 } elseif ( IP::isValidBlock( $target ) ) {
1297                         # Can't create a User from an IP range
1298                         return array( IP::sanitizeRange( $target ), Block::TYPE_RANGE );
1299                 }
1300
1301                 # Consider the possibility that this is not a username at all
1302                 # but actually an old subpage (bug #29797)
1303                 if ( strpos( $target, '/' ) !== false ) {
1304                         # An old subpage, drill down to the user behind it
1305                         $parts = explode( '/', $target );
1306                         $target = $parts[0];
1307                 }
1308
1309                 $userObj = User::newFromName( $target );
1310                 if ( $userObj instanceof User ) {
1311                         # Note that since numbers are valid usernames, a $target of "12345" will be
1312                         # considered a User.  If you want to pass a block ID, prepend a hash "#12345",
1313                         # since hash characters are not valid in usernames or titles generally.
1314                         return array( $userObj, Block::TYPE_USER );
1315
1316                 } elseif ( preg_match( '/^#\d+$/', $target ) ) {
1317                         # Autoblock reference in the form "#12345"
1318                         return array( substr( $target, 1 ), Block::TYPE_AUTO );
1319
1320                 } else {
1321                         # WTF?
1322                         return array( null, null );
1323                 }
1324         }
1325
1326         /**
1327          * Get the type of target for this particular block
1328          * @return int Block::TYPE_ constant, will never be TYPE_ID
1329          */
1330         public function getType() {
1331                 return $this->mAuto
1332                         ? self::TYPE_AUTO
1333                         : $this->type;
1334         }
1335
1336         /**
1337          * Get the target and target type for this particular Block.  Note that for autoblocks,
1338          * this returns the unredacted name; frontend functions need to call $block->getRedactedName()
1339          * in this situation.
1340          * @return array( User|String, Block::TYPE_ constant )
1341          * @todo FIXME: This should be an integral part of the Block member variables
1342          */
1343         public function getTargetAndType() {
1344                 return array( $this->getTarget(), $this->getType() );
1345         }
1346
1347         /**
1348          * Get the target for this particular Block.  Note that for autoblocks,
1349          * this returns the unredacted name; frontend functions need to call $block->getRedactedName()
1350          * in this situation.
1351          * @return User|string
1352          */
1353         public function getTarget() {
1354                 return $this->target;
1355         }
1356
1357         /**
1358          * @since 1.19
1359          *
1360          * @return mixed|string
1361          */
1362         public function getExpiry() {
1363                 return $this->mExpiry;
1364         }
1365
1366         /**
1367          * Set the target for this block, and update $this->type accordingly
1368          * @param mixed $target
1369          */
1370         public function setTarget( $target ) {
1371                 list( $this->target, $this->type ) = self::parseTarget( $target );
1372         }
1373
1374         /**
1375          * Get the user who implemented this block
1376          * @return User|string Local User object or string for a foreign user
1377          */
1378         public function getBlocker() {
1379                 return $this->blocker;
1380         }
1381
1382         /**
1383          * Set the user who implemented (or will implement) this block
1384          * @param User|string $user Local User object or username string for foreign users
1385          */
1386         public function setBlocker( $user ) {
1387                 $this->blocker = $user;
1388         }
1389
1390         /**
1391          * Get the key and parameters for the corresponding error message.
1392          *
1393          * @since 1.22
1394          * @param IContextSource $context
1395          * @return array
1396          */
1397         public function getPermissionsError( IContextSource $context ) {
1398                 $blocker = $this->getBlocker();
1399                 if ( $blocker instanceof User ) { // local user
1400                         $blockerUserpage = $blocker->getUserPage();
1401                         $link = "[[{$blockerUserpage->getPrefixedText()}|{$blockerUserpage->getText()}]]";
1402                 } else { // foreign user
1403                         $link = $blocker;
1404                 }
1405
1406                 $reason = $this->mReason;
1407                 if ( $reason == '' ) {
1408                         $reason = $context->msg( 'blockednoreason' )->text();
1409                 }
1410
1411                 /* $ip returns who *is* being blocked, $intended contains who was meant to be blocked.
1412                  * This could be a username, an IP range, or a single IP. */
1413                 $intended = $this->getTarget();
1414
1415                 $lang = $context->getLanguage();
1416                 return array(
1417                         $this->mAuto ? 'autoblockedtext' : 'blockedtext',
1418                         $link,
1419                         $reason,
1420                         $context->getRequest()->getIP(),
1421                         $this->getByName(),
1422                         $this->getId(),
1423                         $lang->formatExpiry( $this->mExpiry ),
1424                         (string)$intended,
1425                         $lang->userTimeAndDate( $this->mTimestamp, $context->getUser() ),
1426                 );
1427         }
1428 }