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         /* public*/ var $mReason, $mTimestamp, $mAuto, $mExpiry, $mHideName;
  24
  25         protected
  26                 $mId,
  27                 $mFromMaster,
  28
  29                 $mBlockEmail,
  30                 $mDisableUsertalk,
  31                 $mCreateAccount,
  32                 $mParentBlockId;
  33
  34         /// @var User|String
  35         protected $target;
  36
  37         // @var Integer Hack for foreign blocking (CentralAuth)
  38         protected $forcedTargetID;
  39
  40         /// @var Block::TYPE_ constant.  Can only be USER, IP or RANGE internally
  41         protected $type;
  42
  43         /// @var User
  44         protected $blocker;
  45
  46         /// @var Bool
  47         protected $isHardblock = true;
  48
  49         /// @var Bool
  50         protected $isAutoblocking = true;
  51
  52         # TYPE constants
  53         const TYPE_USER = 1;
  54         const TYPE_IP = 2;
  55         const TYPE_RANGE = 3;
  56         const TYPE_AUTO = 4;
  57         const TYPE_ID = 5;
  58
  59         /**
  60          * Constructor
  61          * @todo FIXME: Don't know what the best format to have for this constructor is, but fourteen
  62          * optional parameters certainly isn't it.
  63          */
  64         function __construct( $address = '', $user = 0, $by = 0, $reason = '',
  65                 $timestamp = 0, $auto = 0, $expiry = '', $anonOnly = 0, $createAccount = 0, $enableAutoblock = 0,
  66                 $hideName = 0, $blockEmail = 0, $allowUsertalk = 0, $byText = '' )
  67         {
  68                 if ( $timestamp === 0 ) {
  69                         $timestamp = wfTimestampNow();
  70                 }
  71
  72                 if ( count( func_get_args() ) > 0 ) {
  73                         # Soon... :D
  74                         # wfDeprecated( __METHOD__ . " with arguments" );
  75                 }
  76
  77                 $this->setTarget( $address );
  78                 if ( $this->target instanceof User && $user ) {
  79                         $this->forcedTargetID = $user; // needed for foreign users
  80                 }
  81                 if ( $by ) { // local user
  82                         $this->setBlocker( User::newFromID( $by ) );
  83                 } else { // foreign user
  84                         $this->setBlocker( $byText );
  85                 }
  86                 $this->mReason = $reason;
  87                 $this->mTimestamp = wfTimestamp( TS_MW, $timestamp );
  88                 $this->mAuto = $auto;
  89                 $this->isHardblock( !$anonOnly );
  90                 $this->prevents( 'createaccount', $createAccount );
  91                 if ( $expiry == 'infinity' || $expiry == wfGetDB( DB_SLAVE )->getInfinity() ) {
  92                         $this->mExpiry = 'infinity';
  93                 } else {
  94                         $this->mExpiry = wfTimestamp( TS_MW, $expiry );
  95                 }
  96                 $this->isAutoblocking( $enableAutoblock );
  97                 $this->mHideName = $hideName;
  98                 $this->prevents( 'sendemail', $blockEmail );
  99                 $this->prevents( 'editownusertalk', !$allowUsertalk );
 100
 101                 $this->mFromMaster = false;
 102         }
 103
 104         /**
 105          * Load a block from the database, using either the IP address or
 106          * user ID. Tries the user ID first, and if that doesn't work, tries
 107          * the address.
 108          *
 109          * @param string $address IP address of user/anon
 110          * @param $user Integer: user id of user
 111          * @return Block Object
 112          * @deprecated since 1.18
 113          */
 114         public static function newFromDB( $address, $user = 0 ) {
 115                 wfDeprecated( __METHOD__, '1.18' );
 116                 return self::newFromTarget( User::whoIs( $user ), $address );
 117         }
 118
 119         /**
 120          * Load a blocked user from their block id.
 121          *
 122          * @param $id Integer: Block id to search for
 123          * @return Block object or null
 124          */
 125         public static function newFromID( $id ) {
 126                 $dbr = wfGetDB( DB_SLAVE );
 127                 $res = $dbr->selectRow(
 128                         'ipblocks',
 129                         self::selectFields(),
 130                         array( 'ipb_id' => $id ),
 131                         __METHOD__
 132                 );
 133                 if ( $res ) {
 134                         return self::newFromRow( $res );
 135                 } else {
 136                         return null;
 137                 }
 138         }
 139
 140         /**
 141          * Return the list of ipblocks fields that should be selected to create
 142          * a new block.
 143          * @return array
 144          */
 145         public static function selectFields() {
 146                 return array(
 147                         'ipb_id',
 148                         'ipb_address',
 149                         'ipb_by',
 150                         'ipb_by_text',
 151                         'ipb_reason',
 152                         'ipb_timestamp',
 153                         'ipb_auto',
 154                         'ipb_anon_only',
 155                         'ipb_create_account',
 156                         'ipb_enable_autoblock',
 157                         'ipb_expiry',
 158                         'ipb_deleted',
 159                         'ipb_block_email',
 160                         'ipb_allow_usertalk',
 161                         'ipb_parent_block_id',
 162                 );
 163         }
 164
 165         /**
 166          * Check if two blocks are effectively equal.  Doesn't check irrelevant things like
 167          * the blocking user or the block timestamp, only things which affect the blocked user
 168          *
 169          * @param $block Block
 170          *
 171          * @return bool
 172          */
 173         public function equals( Block $block ) {
 174                 return (
 175                         (string)$this->target == (string)$block->target
 176                         && $this->type == $block->type
 177                         && $this->mAuto == $block->mAuto
 178                         && $this->isHardblock() == $block->isHardblock()
 179                         && $this->prevents( 'createaccount' ) == $block->prevents( 'createaccount' )
 180                         && $this->mExpiry == $block->mExpiry
 181                         && $this->isAutoblocking() == $block->isAutoblocking()
 182                         && $this->mHideName == $block->mHideName
 183                         && $this->prevents( 'sendemail' ) == $block->prevents( 'sendemail' )
 184                         && $this->prevents( 'editownusertalk' ) == $block->prevents( 'editownusertalk' )
 185                         && $this->mReason == $block->mReason
 186                 );
 187         }
 188
 189         /**
 190          * Clear all member variables in the current object. Does not clear
 191          * the block from the DB.
 192          * @deprecated since 1.18
 193          */
 194         public function clear() {
 195                 wfDeprecated( __METHOD__, '1.18' );
 196                 # Noop
 197         }
 198
 199         /**
 200          * Get a block from the DB, with either the given address or the given username
 201          *
 202          * @param string $address The IP address of the user, or blank to skip IP blocks
 203          * @param int $user The user ID, or zero for anonymous users
 204          * @return Boolean: the user is blocked from editing
 205          * @deprecated since 1.18
 206          */
 207         public function load( $address = '', $user = 0 ) {
 208                 wfDeprecated( __METHOD__, '1.18' );
 209                 if ( $user ) {
 210                         $username = User::whoIs( $user );
 211                         $block = self::newFromTarget( $username, $address );
 212                 } else {
 213                         $block = self::newFromTarget( null, $address );
 214                 }
 215
 216                 if ( $block instanceof Block ) {
 217                         # This is mildly evil, but hey, it's B/C :D
 218                         foreach ( $block as $variable => $value ) {
 219                                 $this->$variable = $value;
 220                         }
 221                         return true;
 222                 } else {
 223                         return false;
 224                 }
 225         }
 226
 227         /**
 228          * Load a block from the database which affects the already-set $this->target:
 229          *     1) A block directly on the given user or IP
 230          *     2) A rangeblock encompassing the given IP (smallest first)
 231          *     3) An autoblock on the given IP
 232          * @param $vagueTarget User|String also search for blocks affecting this target.  Doesn't
 233          *     make any sense to use TYPE_AUTO / TYPE_ID here. Leave blank to skip IP lookups.
 234          * @throws MWException
 235          * @return Bool whether a relevant block was found
 236          */
 237         protected function newLoad( $vagueTarget = null ) {
 238                 $db = wfGetDB( $this->mFromMaster ? DB_MASTER : DB_SLAVE );
 239
 240                 if ( $this->type !== null ) {
 241                         $conds = array(
 242                                 'ipb_address' => array( (string)$this->target ),
 243                         );
 244                 } else {
 245                         $conds = array( 'ipb_address' => array() );
 246                 }
 247
 248                 # Be aware that the != '' check is explicit, since empty values will be
 249                 # passed by some callers (bug 29116)
 250                 if ( $vagueTarget != '' ) {
 251                         list( $target, $type ) = self::parseTarget( $vagueTarget );
 252                         switch ( $type ) {
 253                                 case self::TYPE_USER:
 254                                         # Slightly weird, but who are we to argue?
 255                                         $conds['ipb_address'][] = (string)$target;
 256                                         break;
 257
 258                                 case self::TYPE_IP:
 259                                         $conds['ipb_address'][] = (string)$target;
 260                                         $conds[] = self::getRangeCond( IP::toHex( $target ) );
 261                                         $conds = $db->makeList( $conds, LIST_OR );
 262                                         break;
 263
 264                                 case self::TYPE_RANGE:
 265                                         list( $start, $end ) = IP::parseRange( $target );
 266                                         $conds['ipb_address'][] = (string)$target;
 267                                         $conds[] = self::getRangeCond( $start, $end );
 268                                         $conds = $db->makeList( $conds, LIST_OR );
 269                                         break;
 270
 271                                 default:
 272                                         throw new MWException( "Tried to load block with invalid type" );
 273                         }
 274                 }
 275
 276                 $res = $db->select( 'ipblocks', self::selectFields(), $conds, __METHOD__ );
 277
 278                 # This result could contain a block on the user, a block on the IP, and a russian-doll
 279                 # set of rangeblocks.  We want to choose the most specific one, so keep a leader board.
 280                 $bestRow = null;
 281
 282                 # Lower will be better
 283                 $bestBlockScore = 100;
 284
 285                 # This is begging for $this = $bestBlock, but that's not allowed in PHP :(
 286                 $bestBlockPreventsEdit = null;
 287
 288                 foreach ( $res as $row ) {
 289                         $block = self::newFromRow( $row );
 290
 291                         # Don't use expired blocks
 292                         if ( $block->deleteIfExpired() ) {
 293                                 continue;
 294                         }
 295
 296                         # Don't use anon only blocks on users
 297                         if ( $this->type == self::TYPE_USER && !$block->isHardblock() ) {
 298                                 continue;
 299                         }
 300
 301                         if ( $block->getType() == self::TYPE_RANGE ) {
 302                                 # This is the number of bits that are allowed to vary in the block, give
 303                                 # or take some floating point errors
 304                                 $end = wfBaseconvert( $block->getRangeEnd(), 16, 10 );
 305                                 $start = wfBaseconvert( $block->getRangeStart(), 16, 10 );
 306                                 $size = log( $end - $start + 1, 2 );
 307
 308                                 # This has the nice property that a /32 block is ranked equally with a
 309                                 # single-IP block, which is exactly what it is...
 310                                 $score = self::TYPE_RANGE - 1 + ( $size / 128 );
 311
 312                         } else {
 313                                 $score = $block->getType();
 314                         }
 315
 316                         if ( $score < $bestBlockScore ) {
 317                                 $bestBlockScore = $score;
 318                                 $bestRow = $row;
 319                                 $bestBlockPreventsEdit = $block->prevents( 'edit' );
 320                         }
 321                 }
 322
 323                 if ( $bestRow !== null ) {
 324                         $this->initFromRow( $bestRow );
 325                         $this->prevents( 'edit', $bestBlockPreventsEdit );
 326                         return true;
 327                 } else {
 328                         return false;
 329                 }
 330         }
 331
 332         /**
 333          * Get a set of SQL conditions which will select rangeblocks encompassing a given range
 334          * @param string $start Hexadecimal IP representation
 335          * @param string $end Hexadecimal IP representation, or null to use $start = $end
 336          * @return String
 337          */
 338         public static function getRangeCond( $start, $end = null ) {
 339                 if ( $end === null ) {
 340                         $end = $start;
 341                 }
 342                 # Per bug 14634, we want to include relevant active rangeblocks; for
 343                 # rangeblocks, we want to include larger ranges which enclose the given
 344                 # range. We know that all blocks must be smaller than $wgBlockCIDRLimit,
 345                 # so we can improve performance by filtering on a LIKE clause
 346                 $chunk = self::getIpFragment( $start );
 347                 $dbr = wfGetDB( DB_SLAVE );
 348                 $like = $dbr->buildLike( $chunk, $dbr->anyString() );
 349
 350                 # Fairly hard to make a malicious SQL statement out of hex characters,
 351                 # but stranger things have happened...
 352                 $safeStart = $dbr->addQuotes( $start );
 353                 $safeEnd = $dbr->addQuotes( $end );
 354
 355                 return $dbr->makeList(
 356                         array(
 357                                 "ipb_range_start $like",
 358                                 "ipb_range_start <= $safeStart",
 359                                 "ipb_range_end >= $safeEnd",
 360                         ),
 361                         LIST_AND
 362                 );
 363         }
 364
 365         /**
 366          * Get the component of an IP address which is certain to be the same between an IP
 367          * address and a rangeblock containing that IP address.
 368          * @param  $hex String Hexadecimal IP representation
 369          * @return String
 370          */
 371         protected static function getIpFragment( $hex ) {
 372                 global $wgBlockCIDRLimit;
 373                 if ( substr( $hex, 0, 3 ) == 'v6-' ) {
 374                         return 'v6-' . substr( substr( $hex, 3 ), 0, floor( $wgBlockCIDRLimit['IPv6'] / 4 ) );
 375                 } else {
 376                         return substr( $hex, 0, floor( $wgBlockCIDRLimit['IPv4'] / 4 ) );
 377                 }
 378         }
 379
 380         /**
 381          * Given a database row from the ipblocks table, initialize
 382          * member variables
 383          * @param $row ResultWrapper: a row from the ipblocks table
 384          */
 385         protected function initFromRow( $row ) {
 386                 $this->setTarget( $row->ipb_address );
 387                 if ( $row->ipb_by ) { // local user
 388                         $this->setBlocker( User::newFromID( $row->ipb_by ) );
 389                 } else { // foreign user
 390                         $this->setBlocker( $row->ipb_by_text );
 391                 }
 392
 393                 $this->mReason = $row->ipb_reason;
 394                 $this->mTimestamp = wfTimestamp( TS_MW, $row->ipb_timestamp );
 395                 $this->mAuto = $row->ipb_auto;
 396                 $this->mHideName = $row->ipb_deleted;
 397                 $this->mId = $row->ipb_id;
 398                 $this->mParentBlockId = $row->ipb_parent_block_id;
 399
 400                 // I wish I didn't have to do this
 401                 $db = wfGetDB( DB_SLAVE );
 402                 if ( $row->ipb_expiry == $db->getInfinity() ) {
 403                         $this->mExpiry = 'infinity';
 404                 } else {
 405                         $this->mExpiry = wfTimestamp( TS_MW, $row->ipb_expiry );
 406                 }
 407
 408                 $this->isHardblock( !$row->ipb_anon_only );
 409                 $this->isAutoblocking( $row->ipb_enable_autoblock );
 410
 411                 $this->prevents( 'createaccount', $row->ipb_create_account );
 412                 $this->prevents( 'sendemail', $row->ipb_block_email );
 413                 $this->prevents( 'editownusertalk', !$row->ipb_allow_usertalk );
 414         }
 415
 416         /**
 417          * Create a new Block object from a database row
 418          * @param  $row ResultWrapper row from the ipblocks table
 419          * @return Block
 420          */
 421         public static function newFromRow( $row ) {
 422                 $block = new Block;
 423                 $block->initFromRow( $row );
 424                 return $block;
 425         }
 426
 427         /**
 428          * Delete the row from the IP blocks table.
 429          *
 430          * @throws MWException
 431          * @return Boolean
 432          */
 433         public function delete() {
 434                 if ( wfReadOnly() ) {
 435                         return false;
 436                 }
 437
 438                 if ( !$this->getId() ) {
 439                         throw new MWException( "Block::delete() requires that the mId member be filled\n" );
 440                 }
 441
 442                 $dbw = wfGetDB( DB_MASTER );
 443                 $dbw->delete( 'ipblocks', array( 'ipb_parent_block_id' => $this->getId() ), __METHOD__ );
 444                 $dbw->delete( 'ipblocks', array( 'ipb_id' => $this->getId() ), __METHOD__ );
 445
 446                 return $dbw->affectedRows() > 0;
 447         }
 448
 449         /**
 450          * Insert a block into the block table. Will fail if there is a conflicting
 451          * block (same name and options) already in the database.
 452          *
 453          * @param $dbw DatabaseBase if you have one available
 454          * @return mixed: false on failure, assoc array on success:
 455          *      ('id' => block ID, 'autoIds' => array of autoblock IDs)
 456          */
 457         public function insert( $dbw = null ) {
 458                 wfDebug( "Block::insert; timestamp {$this->mTimestamp}\n" );
 459
 460                 if ( $dbw === null ) {
 461                         $dbw = wfGetDB( DB_MASTER );
 462                 }
 463
 464                 # Don't collide with expired blocks
 465                 Block::purgeExpired();
 466
 467                 $row = $this->getDatabaseArray();
 468                 $row['ipb_id'] = $dbw->nextSequenceValue( "ipblocks_ipb_id_seq" );
 469
 470                 $dbw->insert(
 471                         'ipblocks',
 472                         $row,
 473                         __METHOD__,
 474                         array( 'IGNORE' )
 475                 );
 476                 $affected = $dbw->affectedRows();
 477                 $this->mId = $dbw->insertId();
 478
 479                 if ( $affected ) {
 480                         $auto_ipd_ids = $this->doRetroactiveAutoblock();
 481                         return array( 'id' => $this->mId, 'autoIds' => $auto_ipd_ids );
 482                 }
 483
 484                 return false;
 485         }
 486
 487         /**
 488          * Update a block in the DB with new parameters.
 489          * The ID field needs to be loaded first.
 490          *
 491          * @return bool|array False on failure, array on success: ('id' => block ID, 'autoIds' => array of autoblock IDs)
 492          */
 493         public function update() {
 494                 wfDebug( "Block::update; timestamp {$this->mTimestamp}\n" );
 495                 $dbw = wfGetDB( DB_MASTER );
 496
 497                 $dbw->startAtomic( __METHOD__ );
 498
 499                 $dbw->update(
 500                         'ipblocks',
 501                         $this->getDatabaseArray( $dbw ),
 502                         array( 'ipb_id' => $this->getId() ),
 503                         __METHOD__
 504                 );
 505
 506                 $affected = $dbw->affectedRows();
 507
 508                 $dbw->update(
 509                         'ipblocks',
 510                         $this->getAutoblockUpdateArray(),
 511                         array( 'ipb_parent_block_id' => $this->getId() ),
 512                         __METHOD__
 513                 );
 514
 515                 $dbw->endAtomic( __METHOD__ );
 516
 517                 if ( $affected ) {
 518                         $auto_ipd_ids = $this->doRetroactiveAutoblock();
 519                         return array( 'id' => $this->mId, 'autoIds' => $auto_ipd_ids );
 520                 }
 521
 522                 return false;
 523         }
 524
 525         /**
 526          * Get an array suitable for passing to $dbw->insert() or $dbw->update()
 527          * @param $db DatabaseBase
 528          * @return Array
 529          */
 530         protected function getDatabaseArray( $db = null ) {
 531                 if ( !$db ) {
 532                         $db = wfGetDB( DB_SLAVE );
 533                 }
 534                 $expiry = $db->encodeExpiry( $this->mExpiry );
 535
 536                 if ( $this->forcedTargetID ) {
 537                         $uid = $this->forcedTargetID;
 538                 } else {
 539                         $uid = $this->target instanceof User ? $this->target->getID() : 0;
 540                 }
 541
 542                 $a = array(
 543                         'ipb_address'          => (string)$this->target,
 544                         'ipb_user'             => $uid,
 545                         'ipb_by'               => $this->getBy(),
 546                         'ipb_by_text'          => $this->getByName(),
 547                         'ipb_reason'           => $this->mReason,
 548                         'ipb_timestamp'        => $db->timestamp( $this->mTimestamp ),
 549                         'ipb_auto'             => $this->mAuto,
 550                         'ipb_anon_only'        => !$this->isHardblock(),
 551                         'ipb_create_account'   => $this->prevents( 'createaccount' ),
 552                         'ipb_enable_autoblock' => $this->isAutoblocking(),
 553                         'ipb_expiry'           => $expiry,
 554                         'ipb_range_start'      => $this->getRangeStart(),
 555                         'ipb_range_end'        => $this->getRangeEnd(),
 556                         'ipb_deleted'          => intval( $this->mHideName ), // typecast required for SQLite
 557                         'ipb_block_email'      => $this->prevents( 'sendemail' ),
 558                         'ipb_allow_usertalk'   => !$this->prevents( 'editownusertalk' ),
 559                         'ipb_parent_block_id'  => $this->mParentBlockId
 560                 );
 561
 562                 return $a;
 563         }
 564
 565         /**
 566          * @return Array
 567          */
 568         protected function getAutoblockUpdateArray() {
 569                 return array(
 570                         'ipb_by'               => $this->getBy(),
 571                         'ipb_by_text'          => $this->getByName(),
 572                         'ipb_reason'           => $this->mReason,
 573                         'ipb_create_account'   => $this->prevents( 'createaccount' ),
 574                         'ipb_deleted'          => (int)$this->mHideName, // typecast required for SQLite
 575                         'ipb_allow_usertalk'   => !$this->prevents( 'editownusertalk' ),
 576                 );
 577         }
 578
 579         /**
 580          * Retroactively autoblocks the last IP used by the user (if it is a user)
 581          * blocked by this Block.
 582          *
 583          * @return Array: block IDs of retroactive autoblocks made
 584          */
 585         protected function doRetroactiveAutoblock() {
 586                 $blockIds = array();
 587                 # If autoblock is enabled, autoblock the LAST IP(s) used
 588                 if ( $this->isAutoblocking() && $this->getType() == self::TYPE_USER ) {
 589                         wfDebug( "Doing retroactive autoblocks for " . $this->getTarget() . "\n" );
 590
 591                         $continue = wfRunHooks(
 592                                 'PerformRetroactiveAutoblock', array( $this, &$blockIds ) );
 593
 594                         if ( $continue ) {
 595                                 self::defaultRetroactiveAutoblock( $this, $blockIds );
 596                         }
 597                 }
 598                 return $blockIds;
 599         }
 600
 601         /**
 602          * Retroactively autoblocks the last IP used by the user (if it is a user)
 603          * blocked by this Block. This will use the recentchanges table.
 604          *
 605          * @param Block $block
 606          * @param array &$blockIds
 607          * @return Array: block IDs of retroactive autoblocks made
 608          */
 609         protected static function defaultRetroactiveAutoblock( Block $block, array &$blockIds ) {
 610                 global $wgPutIPinRC;
 611
 612                 // No IPs are in recentchanges table, so nothing to select
 613                 if ( !$wgPutIPinRC ) {
 614                         return;
 615                 }
 616
 617                 $dbr = wfGetDB( DB_SLAVE );
 618
 619                 $options = array( 'ORDER BY' => 'rc_timestamp DESC' );
 620                 $conds = array( 'rc_user_text' => (string)$block->getTarget() );
 621
 622                 // Just the last IP used.
 623                 $options['LIMIT'] = 1;
 624
 625                 $res = $dbr->select( 'recentchanges', array( 'rc_ip' ), $conds,
 626                         __METHOD__, $options );
 627
 628                 if ( !$res->numRows() ) {
 629                         # No results, don't autoblock anything
 630                         wfDebug( "No IP found to retroactively autoblock\n" );
 631                 } else {
 632                         foreach ( $res as $row ) {
 633                                 if ( $row->rc_ip ) {
 634                                         $id = $block->doAutoblock( $row->rc_ip );
 635                                         if ( $id ) {
 636                                                 $blockIds[] = $id;
 637                                         }
 638                                 }
 639                         }
 640                 }
 641         }
 642
 643         /**
 644          * Checks whether a given IP is on the autoblock whitelist.
 645          * TODO: this probably belongs somewhere else, but not sure where...
 646          *
 647          * @param string $ip The IP to check
 648          * @return Boolean
 649          */
 650         public static function isWhitelistedFromAutoblocks( $ip ) {
 651                 global $wgMemc;
 652
 653                 // Try to get the autoblock_whitelist from the cache, as it's faster
 654                 // than getting the msg raw and explode()'ing it.
 655                 $key = wfMemcKey( 'ipb', 'autoblock', 'whitelist' );
 656                 $lines = $wgMemc->get( $key );
 657                 if ( !$lines ) {
 658                         $lines = explode( "\n", wfMessage( 'autoblock_whitelist' )->inContentLanguage()->plain() );
 659                         $wgMemc->set( $key, $lines, 3600 * 24 );
 660                 }
 661
 662                 wfDebug( "Checking the autoblock whitelist..\n" );
 663
 664                 foreach ( $lines as $line ) {
 665                         # List items only
 666                         if ( substr( $line, 0, 1 ) !== '*' ) {
 667                                 continue;
 668                         }
 669
 670                         $wlEntry = substr( $line, 1 );
 671                         $wlEntry = trim( $wlEntry );
 672
 673                         wfDebug( "Checking $ip against $wlEntry..." );
 674
 675                         # Is the IP in this range?
 676                         if ( IP::isInRange( $ip, $wlEntry ) ) {
 677                                 wfDebug( " IP $ip matches $wlEntry, not autoblocking\n" );
 678                                 return true;
 679                         } else {
 680                                 wfDebug( " No match\n" );
 681                         }
 682                 }
 683
 684                 return false;
 685         }
 686
 687         /**
 688          * Autoblocks the given IP, referring to this Block.
 689          *
 690          * @param string $autoblockIP the IP to autoblock.
 691          * @return mixed: block ID if an autoblock was inserted, false if not.
 692          */
 693         public function doAutoblock( $autoblockIP ) {
 694                 # If autoblocks are disabled, go away.
 695                 if ( !$this->isAutoblocking() ) {
 696                         return false;
 697                 }
 698
 699                 # Check for presence on the autoblock whitelist.
 700                 if ( self::isWhitelistedFromAutoblocks( $autoblockIP ) ) {
 701                         return false;
 702                 }
 703
 704                 # Allow hooks to cancel the autoblock.
 705                 if ( !wfRunHooks( 'AbortAutoblock', array( $autoblockIP, &$this ) ) ) {
 706                         wfDebug( "Autoblock aborted by hook.\n" );
 707                         return false;
 708                 }
 709
 710                 # It's okay to autoblock. Go ahead and insert/update the block...
 711
 712                 # Do not add a *new* block if the IP is already blocked.
 713                 $ipblock = Block::newFromTarget( $autoblockIP );
 714                 if ( $ipblock ) {
 715                         # Check if the block is an autoblock and would exceed the user block
 716                         # if renewed. If so, do nothing, otherwise prolong the block time...
 717                         if ( $ipblock->mAuto && // @todo Why not compare $ipblock->mExpiry?
 718                                 $this->mExpiry > Block::getAutoblockExpiry( $ipblock->mTimestamp )
 719                         ) {
 720                                 # Reset block timestamp to now and its expiry to
 721                                 # $wgAutoblockExpiry in the future
 722                                 $ipblock->updateTimestamp();
 723                         }
 724                         return false;
 725                 }
 726
 727                 # Make a new block object with the desired properties.
 728                 $autoblock = new Block;
 729                 wfDebug( "Autoblocking {$this->getTarget()}@" . $autoblockIP . "\n" );
 730                 $autoblock->setTarget( $autoblockIP );
 731                 $autoblock->setBlocker( $this->getBlocker() );
 732                 $autoblock->mReason = wfMessage( 'autoblocker', $this->getTarget(), $this->mReason )->inContentLanguage()->plain();
 733                 $timestamp = wfTimestampNow();
 734                 $autoblock->mTimestamp = $timestamp;
 735                 $autoblock->mAuto = 1;
 736                 $autoblock->prevents( 'createaccount', $this->prevents( 'createaccount' ) );
 737                 # Continue suppressing the name if needed
 738                 $autoblock->mHideName = $this->mHideName;
 739                 $autoblock->prevents( 'editownusertalk', $this->prevents( 'editownusertalk' ) );
 740                 $autoblock->mParentBlockId = $this->mId;
 741
 742                 if ( $this->mExpiry == 'infinity' ) {
 743                         # Original block was indefinite, start an autoblock now
 744                         $autoblock->mExpiry = Block::getAutoblockExpiry( $timestamp );
 745                 } else {
 746                         # If the user is already blocked with an expiry date, we don't
 747                         # want to pile on top of that.
 748                         $autoblock->mExpiry = min( $this->mExpiry, Block::getAutoblockExpiry( $timestamp ) );
 749                 }
 750
 751                 # Insert the block...
 752                 $status = $autoblock->insert();
 753                 return $status
 754                         ? $status['id']
 755                         : false;
 756         }
 757
 758         /**
 759          * Check if a block has expired. Delete it if it is.
 760          * @return Boolean
 761          */
 762         public function deleteIfExpired() {
 763                 wfProfileIn( __METHOD__ );
 764
 765                 if ( $this->isExpired() ) {
 766                         wfDebug( "Block::deleteIfExpired() -- deleting\n" );
 767                         $this->delete();
 768                         $retVal = true;
 769                 } else {
 770                         wfDebug( "Block::deleteIfExpired() -- not expired\n" );
 771                         $retVal = false;
 772                 }
 773
 774                 wfProfileOut( __METHOD__ );
 775                 return $retVal;
 776         }
 777
 778         /**
 779          * Has the block expired?
 780          * @return Boolean
 781          */
 782         public function isExpired() {
 783                 $timestamp = wfTimestampNow();
 784                 wfDebug( "Block::isExpired() checking current " . $timestamp . " vs $this->mExpiry\n" );
 785
 786                 if ( !$this->mExpiry ) {
 787                         return false;
 788                 } else {
 789                         return $timestamp > $this->mExpiry;
 790                 }
 791         }
 792
 793         /**
 794          * Is the block address valid (i.e. not a null string?)
 795          * @return Boolean
 796          */
 797         public function isValid() {
 798                 return $this->getTarget() != null;
 799         }
 800
 801         /**
 802          * Update the timestamp on autoblocks.
 803          */
 804         public function updateTimestamp() {
 805                 if ( $this->mAuto ) {
 806                         $this->mTimestamp = wfTimestamp();
 807                         $this->mExpiry = Block::getAutoblockExpiry( $this->mTimestamp );
 808
 809                         $dbw = wfGetDB( DB_MASTER );
 810                         $dbw->update( 'ipblocks',
 811                                 array( /* SET */
 812                                         'ipb_timestamp' => $dbw->timestamp( $this->mTimestamp ),
 813                                         'ipb_expiry' => $dbw->timestamp( $this->mExpiry ),
 814                                 ),
 815                                 array( /* WHERE */
 816                                         'ipb_address' => (string)$this->getTarget()
 817                                 ),
 818                                 __METHOD__
 819                         );
 820                 }
 821         }
 822
 823         /**
 824          * Get the IP address at the start of the range in Hex form
 825          * @throws MWException
 826          * @return String IP in Hex form
 827          */
 828         public function getRangeStart() {
 829                 switch ( $this->type ) {
 830                         case self::TYPE_USER:
 831                                 return '';
 832                         case self::TYPE_IP:
 833                                 return IP::toHex( $this->target );
 834                         case self::TYPE_RANGE:
 835                                 list( $start, /*...*/ ) = IP::parseRange( $this->target );
 836                                 return $start;
 837                         default:
 838                                 throw new MWException( "Block with invalid type" );
 839                 }
 840         }
 841
 842         /**
 843          * Get the IP address at the end of the range in Hex form
 844          * @throws MWException
 845          * @return String IP in Hex form
 846          */
 847         public function getRangeEnd() {
 848                 switch ( $this->type ) {
 849                         case self::TYPE_USER:
 850                                 return '';
 851                         case self::TYPE_IP:
 852                                 return IP::toHex( $this->target );
 853                         case self::TYPE_RANGE:
 854                                 list( /*...*/, $end ) = IP::parseRange( $this->target );
 855                                 return $end;
 856                         default:
 857                                 throw new MWException( "Block with invalid type" );
 858                 }
 859         }
 860
 861         /**
 862          * Get the user id of the blocking sysop
 863          *
 864          * @return Integer (0 for foreign users)
 865          */
 866         public function getBy() {
 867                 $blocker = $this->getBlocker();
 868                 return ( $blocker instanceof User )
 869                         ? $blocker->getId()
 870                         : 0;
 871         }
 872
 873         /**
 874          * Get the username of the blocking sysop
 875          *
 876          * @return String
 877          */
 878         public function getByName() {
 879                 $blocker = $this->getBlocker();
 880                 return ( $blocker instanceof User )
 881                         ? $blocker->getName()
 882                         : (string)$blocker; // username
 883         }
 884
 885         /**
 886          * Get the block ID
 887          * @return int
 888          */
 889         public function getId() {
 890                 return $this->mId;
 891         }
 892
 893         /**
 894          * Get/set the SELECT ... FOR UPDATE flag
 895          * @deprecated since 1.18
 896          *
 897          * @param $x Bool
 898          */
 899         public function forUpdate( $x = null ) {
 900                 wfDeprecated( __METHOD__, '1.18' );
 901                 # noop
 902         }
 903
 904         /**
 905          * Get/set a flag determining whether the master is used for reads
 906          *
 907          * @param $x Bool
 908          * @return Bool
 909          */
 910         public function fromMaster( $x = null ) {
 911                 return wfSetVar( $this->mFromMaster, $x );
 912         }
 913
 914         /**
 915          * Get/set whether the Block is a hardblock (affects logged-in users on a given IP/range
 916          * @param $x Bool
 917          * @return  Bool
 918          */
 919         public function isHardblock( $x = null ) {
 920                 wfSetVar( $this->isHardblock, $x );
 921
 922                 # You can't *not* hardblock a user
 923                 return $this->getType() == self::TYPE_USER
 924                         ? true
 925                         : $this->isHardblock;
 926         }
 927
 928         public function isAutoblocking( $x = null ) {
 929                 wfSetVar( $this->isAutoblocking, $x );
 930
 931                 # You can't put an autoblock on an IP or range as we don't have any history to
 932                 # look over to get more IPs from
 933                 return $this->getType() == self::TYPE_USER
 934                         ? $this->isAutoblocking
 935                         : false;
 936         }
 937
 938         /**
 939          * Get/set whether the Block prevents a given action
 940          * @param $action String
 941          * @param $x Bool
 942          * @return Bool
 943          */
 944         public function prevents( $action, $x = null ) {
 945                 switch ( $action ) {
 946                         case 'edit':
 947                                 # For now... <evil laugh>
 948                                 return true;
 949
 950                         case 'createaccount':
 951                                 return wfSetVar( $this->mCreateAccount, $x );
 952
 953                         case 'sendemail':
 954                                 return wfSetVar( $this->mBlockEmail, $x );
 955
 956                         case 'editownusertalk':
 957                                 return wfSetVar( $this->mDisableUsertalk, $x );
 958
 959                         default:
 960                                 return null;
 961                 }
 962         }
 963
 964         /**
 965          * Get the block name, but with autoblocked IPs hidden as per standard privacy policy
 966          * @return String, text is escaped
 967          */
 968         public function getRedactedName() {
 969                 if ( $this->mAuto ) {
 970                         return Html::rawElement(
 971                                 'span',
 972                                 array( 'class' => 'mw-autoblockid' ),
 973                                 wfMessage( 'autoblockid', $this->mId )
 974                         );
 975                 } else {
 976                         return htmlspecialchars( $this->getTarget() );
 977                 }
 978         }
 979
 980         /**
 981          * Encode expiry for DB
 982          *
 983          * @param string $expiry timestamp for expiry, or
 984          * @param $db DatabaseBase object
 985          * @return String
 986          * @deprecated since 1.18; use $dbw->encodeExpiry() instead
 987          */
 988         public static function encodeExpiry( $expiry, $db ) {
 989                 wfDeprecated( __METHOD__, '1.18' );
 990                 return $db->encodeExpiry( $expiry );
 991         }
 992
 993         /**
 994          * Decode expiry which has come from the DB
 995          *
 996          * @param string $expiry Database expiry format
 997          * @param int $timestampType Requested timestamp format
 998          * @return String
 999          * @deprecated since 1.18; use $wgLang->formatExpiry() instead
1000          */
1001         public static function decodeExpiry( $expiry, $timestampType = TS_MW ) {
1002                 wfDeprecated( __METHOD__, '1.18' );
1003                 global $wgContLang;
1004                 return $wgContLang->formatExpiry( $expiry, $timestampType );
1005         }
1006
1007         /**
1008          * Get a timestamp of the expiry for autoblocks
1009          *
1010          * @param $timestamp String|Int
1011          * @return String
1012          */
1013         public static function getAutoblockExpiry( $timestamp ) {
1014                 global $wgAutoblockExpiry;
1015
1016                 return wfTimestamp( TS_MW, wfTimestamp( TS_UNIX, $timestamp ) + $wgAutoblockExpiry );
1017         }
1018
1019         /**
1020          * Gets rid of unneeded numbers in quad-dotted/octet IP strings
1021          * For example, 127.111.113.151/24 -> 127.111.113.0/24
1022          * @param string $range IP address to normalize
1023          * @return string
1024          * @deprecated since 1.18, call IP::sanitizeRange() directly
1025          */
1026         public static function normaliseRange( $range ) {
1027                 wfDeprecated( __METHOD__, '1.18' );
1028                 return IP::sanitizeRange( $range );
1029         }
1030
1031         /**
1032          * Purge expired blocks from the ipblocks table
1033          */
1034         public static function purgeExpired() {
1035                 if ( wfReadOnly() ) {
1036                         return;
1037                 }
1038
1039                 $method = __METHOD__;
1040                 $dbw = wfGetDB( DB_MASTER );
1041                 $dbw->onTransactionIdle( function() use ( $dbw, $method ) {
1042                         $dbw->delete( 'ipblocks',
1043                                 array( 'ipb_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ), $method );
1044                 } );
1045         }
1046
1047         /**
1048          * Get a value to insert into expiry field of the database when infinite expiry
1049          * is desired
1050          * @deprecated since 1.18, call $dbr->getInfinity() directly
1051          * @return String
1052          */
1053         public static function infinity() {
1054                 wfDeprecated( __METHOD__, '1.18' );
1055                 return wfGetDB( DB_SLAVE )->getInfinity();
1056         }
1057
1058         /**
1059          * Convert a submitted expiry time, which may be relative ("2 weeks", etc) or absolute
1060          * ("24 May 2034"), into an absolute timestamp we can put into the database.
1061          * @param string $expiry whatever was typed into the form
1062          * @return String: timestamp or "infinity" string for th DB implementation
1063          * @deprecated since 1.18 moved to SpecialBlock::parseExpiryInput()
1064          */
1065         public static function parseExpiryInput( $expiry ) {
1066                 wfDeprecated( __METHOD__, '1.18' );
1067                 return SpecialBlock::parseExpiryInput( $expiry );
1068         }
1069
1070         /**
1071          * Given a target and the target's type, get an existing Block object if possible.
1072          * @param $specificTarget String|User|Int a block target, which may be one of several types:
1073          *     * A user to block, in which case $target will be a User
1074          *     * An IP to block, in which case $target will be a User generated by using
1075          *       User::newFromName( $ip, false ) to turn off name validation
1076          *     * An IP range, in which case $target will be a String "123.123.123.123/18" etc
1077          *     * The ID of an existing block, in the format "#12345" (since pure numbers are valid
1078          *       usernames
1079          *     Calling this with a user, IP address or range will not select autoblocks, and will
1080          *     only select a block where the targets match exactly (so looking for blocks on
1081          *     1.2.3.4 will not select 1.2.0.0/16 or even 1.2.3.4/32)
1082          * @param $vagueTarget String|User|Int as above, but we will search for *any* block which
1083          *     affects that target (so for an IP address, get ranges containing that IP; and also
1084          *     get any relevant autoblocks). Leave empty or blank to skip IP-based lookups.
1085          * @param bool $fromMaster whether to use the DB_MASTER database
1086          * @return Block|null (null if no relevant block could be found).  The target and type
1087          *     of the returned Block will refer to the actual block which was found, which might
1088          *     not be the same as the target you gave if you used $vagueTarget!
1089          */
1090         public static function newFromTarget( $specificTarget, $vagueTarget = null, $fromMaster = false ) {
1091
1092                 list( $target, $type ) = self::parseTarget( $specificTarget );
1093                 if ( $type == Block::TYPE_ID || $type == Block::TYPE_AUTO ) {
1094                         return Block::newFromID( $target );
1095
1096                 } elseif ( $target === null && $vagueTarget == '' ) {
1097                         # We're not going to find anything useful here
1098                         # Be aware that the == '' check is explicit, since empty values will be
1099                         # passed by some callers (bug 29116)
1100                         return null;
1101
1102                 } elseif ( in_array( $type, array( Block::TYPE_USER, Block::TYPE_IP, Block::TYPE_RANGE, null ) ) ) {
1103                         $block = new Block();
1104                         $block->fromMaster( $fromMaster );
1105
1106                         if ( $type !== null ) {
1107                                 $block->setTarget( $target );
1108                         }
1109
1110                         if ( $block->newLoad( $vagueTarget ) ) {
1111                                 return $block;
1112                         }
1113                 }
1114                 return null;
1115         }
1116
1117
1118         /**
1119          * Get all blocks that match any IP from an array of IP addresses
1120          *
1121          * @param Array $ipChain list of IPs (strings), usually retrieved from the
1122          *         X-Forwarded-For header of the request
1123          * @param Bool $isAnon Exclude anonymous-only blocks if false
1124          * @param Bool $fromMaster Whether to query the master or slave database
1125          * @return Array of Blocks
1126          * @since 1.22
1127          */
1128         public static function getBlocksForIPList( array $ipChain, $isAnon, $fromMaster = false ) {
1129                 if ( !count( $ipChain ) ) {
1130                         return array();
1131                 }
1132
1133                 wfProfileIn( __METHOD__ );
1134                 $conds = array();
1135                 foreach ( array_unique( $ipChain ) as $ipaddr ) {
1136                         # Discard invalid IP addresses. Since XFF can be spoofed and we do not
1137                         # necessarily trust the header given to us, make sure that we are only
1138                         # checking for blocks on well-formatted IP addresses (IPv4 and IPv6).
1139                         # Do not treat private IP spaces as special as it may be desirable for wikis
1140                         # to block those IP ranges in order to stop misbehaving proxies that spoof XFF.
1141                         if ( !IP::isValid( $ipaddr ) ) {
1142                                 continue;
1143                         }
1144                         # Don't check trusted IPs (includes local squids which will be in every request)
1145                         if ( wfIsTrustedProxy( $ipaddr ) ) {
1146                                 continue;
1147                         }
1148                         # Check both the original IP (to check against single blocks), as well as build
1149                         # the clause to check for rangeblocks for the given IP.
1150                         $conds['ipb_address'][] = $ipaddr;
1151                         $conds[] = self::getRangeCond( IP::toHex( $ipaddr ) );
1152                 }
1153
1154                 if ( !count( $conds ) ) {
1155                         wfProfileOut( __METHOD__ );
1156                         return array();
1157                 }
1158
1159                 if ( $fromMaster ) {
1160                         $db = wfGetDB( DB_MASTER );
1161                 } else {
1162                         $db = wfGetDB( DB_SLAVE );
1163                 }
1164                 $conds = $db->makeList( $conds, LIST_OR );
1165                 if ( !$isAnon ) {
1166                         $conds = array( $conds, 'ipb_anon_only' => 0 );
1167                 }
1168                 $selectFields = array_merge(
1169                         array( 'ipb_range_start', 'ipb_range_end' ),
1170                         Block::selectFields()
1171                 );
1172                 $rows = $db->select( 'ipblocks',
1173                         $selectFields,
1174                         $conds,
1175                         __METHOD__
1176                 );
1177
1178                 $blocks = array();
1179                 foreach ( $rows as $row ) {
1180                         $block = self::newFromRow( $row );
1181                         if ( !$block->deleteIfExpired()  ) {
1182                                 $blocks[] = $block;
1183                         }
1184                 }
1185
1186                 wfProfileOut( __METHOD__ );
1187                 return $blocks;
1188         }
1189
1190         /**
1191          * From a list of multiple blocks, find the most exact and strongest Block.
1192          * The logic for finding the "best" block is:
1193          *  - Blocks that match the block's target IP are preferred over ones in a range
1194          *  - Hardblocks are chosen over softblocks that prevent account creation
1195          *  - Softblocks that prevent account creation are chosen over other softblocks
1196          *  - Other softblocks are chosen over autoblocks
1197          *  - If there are multiple exact or range blocks at the same level, the one chosen
1198          *    is random
1199
1200          * @param Array $ipChain list of IPs (strings). This is used to determine how "close"
1201          *        a block is to the server, and if a block matches exactly, or is in a range.
1202          *        The order is furthest from the server to nearest e.g., (Browser, proxy1, proxy2,
1203          *        local-squid, ...)
1204          * @param Array $block Array of blocks
1205          * @return Block|null the "best" block from the list
1206          */
1207         public static function chooseBlock( array $blocks, array $ipChain ) {
1208                 if ( !count( $blocks ) ) {
1209                         return null;
1210                 } elseif ( count( $blocks ) == 1 ) {
1211                         return $blocks[0];
1212                 }
1213
1214                 wfProfileIn( __METHOD__ );
1215
1216                 // Sort hard blocks before soft ones and secondarily sort blocks
1217                 // that disable account creation before those that don't.
1218                 usort( $blocks, function( Block $a, Block $b ) {
1219                         $aWeight = (int)$a->isHardblock() . (int)$a->prevents( 'createaccount' );
1220                         $bWeight = (int)$b->isHardblock() . (int)$b->prevents( 'createaccount' );
1221                         return strcmp( $bWeight, $aWeight ); // highest weight first
1222                 } );
1223
1224                 $blocksListExact = array(
1225                         'hard' => false,
1226                         'disable_create' => false,
1227                         'other' => false,
1228                         'auto' => false
1229                 );
1230                 $blocksListRange = array(
1231                         'hard' => false,
1232                         'disable_create' => false,
1233                         'other' => false,
1234                         'auto' => false
1235                 );
1236                 $ipChain = array_reverse( $ipChain );
1237
1238                 foreach ( $blocks as $block ) {
1239                         // Stop searching if we have already have a "better" block. This
1240                         // is why the order of the blocks matters
1241                         if ( !$block->isHardblock() && $blocksListExact['hard'] ) {
1242                                 break;
1243                         } elseif ( !$block->prevents( 'createaccount' ) && $blocksListExact['disable_create'] ) {
1244                                 break;
1245                         }
1246
1247                         foreach ( $ipChain as $checkip ) {
1248                                 $checkipHex = IP::toHex( $checkip );
1249                                 if ( (string)$block->getTarget() === $checkip ) {
1250                                         if ( $block->isHardblock() ) {
1251                                                 $blocksListExact['hard'] = $blocksListExact['hard'] ?: $block;
1252                                         } elseif ( $block->prevents( 'createaccount' ) ) {
1253                                                 $blocksListExact['disable_create'] = $blocksListExact['disable_create'] ?: $block;
1254                                         } elseif ( $block->mAuto ) {
1255                                                 $blocksListExact['auto'] = $blocksListExact['auto'] ?: $block;
1256                                         } else {
1257                                                 $blocksListExact['other'] = $blocksListExact['other'] ?: $block;
1258                                         }
1259                                         // We found closest exact match in the ip list, so go to the next Block
1260                                         break;
1261                                 } elseif ( array_filter( $blocksListExact ) == array()
1262                                         && $block->getRangeStart() <= $checkipHex
1263                                         && $block->getRangeEnd() >= $checkipHex
1264                                 ) {
1265                                         if ( $block->isHardblock() ) {
1266                                                 $blocksListRange['hard'] = $blocksListRange['hard'] ?: $block;
1267                                         } elseif ( $block->prevents( 'createaccount' ) ) {
1268                                                 $blocksListRange['disable_create'] = $blocksListRange['disable_create'] ?: $block;
1269                                         } elseif ( $block->mAuto ) {
1270                                                 $blocksListRange['auto'] = $blocksListRange['auto'] ?: $block;
1271                                         } else {
1272                                                 $blocksListRange['other'] = $blocksListRange['other'] ?: $block;
1273                                         }
1274                                         break;
1275                                 }
1276                         }
1277                 }
1278
1279                 if ( array_filter( $blocksListExact ) == array() ) {
1280                         $blocksList = &$blocksListRange;
1281                 } else {
1282                         $blocksList = &$blocksListExact;
1283                 }
1284
1285                 $chosenBlock = null;
1286                 if ( $blocksList['hard'] ) {
1287                         $chosenBlock = $blocksList['hard'];
1288                 } elseif ( $blocksList['disable_create'] ) {
1289                         $chosenBlock = $blocksList['disable_create'];
1290                 } elseif ( $blocksList['other'] ) {
1291                         $chosenBlock = $blocksList['other'];
1292                 } elseif ( $blocksList['auto'] ) {
1293                         $chosenBlock = $blocksList['auto'];
1294                 } else {
1295                         wfProfileOut( __METHOD__ );
1296                         throw new MWException( "Proxy block found, but couldn't be classified." );
1297                 }
1298
1299                 wfProfileOut( __METHOD__ );
1300                 return $chosenBlock;
1301         }
1302
1303         /**
1304          * From an existing Block, get the target and the type of target.
1305          * Note that, except for null, it is always safe to treat the target
1306          * as a string; for User objects this will return User::__toString()
1307          * which in turn gives User::getName().
1308          *
1309          * @param $target String|Int|User|null
1310          * @return array( User|String|null, Block::TYPE_ constant|null )
1311          */
1312         public static function parseTarget( $target ) {
1313                 # We may have been through this before
1314                 if ( $target instanceof User ) {
1315                         if ( IP::isValid( $target->getName() ) ) {
1316                                 return array( $target, self::TYPE_IP );
1317                         } else {
1318                                 return array( $target, self::TYPE_USER );
1319                         }
1320                 } elseif ( $target === null ) {
1321                         return array( null, null );
1322                 }
1323
1324                 $target = trim( $target );
1325
1326                 if ( IP::isValid( $target ) ) {
1327                         # We can still create a User if it's an IP address, but we need to turn
1328                         # off validation checking (which would exclude IP addresses)
1329                         return array(
1330                                 User::newFromName( IP::sanitizeIP( $target ), false ),
1331                                 Block::TYPE_IP
1332                         );
1333
1334                 } elseif ( IP::isValidBlock( $target ) ) {
1335                         # Can't create a User from an IP range
1336                         return array( IP::sanitizeRange( $target ), Block::TYPE_RANGE );
1337                 }
1338
1339                 # Consider the possibility that this is not a username at all
1340                 # but actually an old subpage (bug #29797)
1341                 if ( strpos( $target, '/' ) !== false ) {
1342                         # An old subpage, drill down to the user behind it
1343                         $parts = explode( '/', $target );
1344                         $target = $parts[0];
1345                 }
1346
1347                 $userObj = User::newFromName( $target );
1348                 if ( $userObj instanceof User ) {
1349                         # Note that since numbers are valid usernames, a $target of "12345" will be
1350                         # considered a User.  If you want to pass a block ID, prepend a hash "#12345",
1351                         # since hash characters are not valid in usernames or titles generally.
1352                         return array( $userObj, Block::TYPE_USER );
1353
1354                 } elseif ( preg_match( '/^#\d+$/', $target ) ) {
1355                         # Autoblock reference in the form "#12345"
1356                         return array( substr( $target, 1 ), Block::TYPE_AUTO );
1357
1358                 } else {
1359                         # WTF?
1360                         return array( null, null );
1361                 }
1362         }
1363
1364         /**
1365          * Get the type of target for this particular block
1366          * @return Block::TYPE_ constant, will never be TYPE_ID
1367          */
1368         public function getType() {
1369                 return $this->mAuto
1370                         ? self::TYPE_AUTO
1371                         : $this->type;
1372         }
1373
1374         /**
1375          * Get the target and target type for this particular Block.  Note that for autoblocks,
1376          * this returns the unredacted name; frontend functions need to call $block->getRedactedName()
1377          * in this situation.
1378          * @return array( User|String, Block::TYPE_ constant )
1379          * @todo FIXME: This should be an integral part of the Block member variables
1380          */
1381         public function getTargetAndType() {
1382                 return array( $this->getTarget(), $this->getType() );
1383         }
1384
1385         /**
1386          * Get the target for this particular Block.  Note that for autoblocks,
1387          * this returns the unredacted name; frontend functions need to call $block->getRedactedName()
1388          * in this situation.
1389          * @return User|String
1390          */
1391         public function getTarget() {
1392                 return $this->target;
1393         }
1394
1395         /**
1396          * @since 1.19
1397          *
1398          * @return Mixed|string
1399          */
1400         public function getExpiry() {
1401                 return $this->mExpiry;
1402         }
1403
1404         /**
1405          * Set the target for this block, and update $this->type accordingly
1406          * @param $target Mixed
1407          */
1408         public function setTarget( $target ) {
1409                 list( $this->target, $this->type ) = self::parseTarget( $target );
1410         }
1411
1412         /**
1413          * Get the user who implemented this block
1414          * @return User|string Local User object or string for a foreign user
1415          */
1416         public function getBlocker() {
1417                 return $this->blocker;
1418         }
1419
1420         /**
1421          * Set the user who implemented (or will implement) this block
1422          * @param $user User|string Local User object or username string for foreign users
1423          */
1424         public function setBlocker( $user ) {
1425                 $this->blocker = $user;
1426         }
1427
1428         /**
1429          * Get the key and parameters for the corresponding error message.
1430          *
1431          * @since 1.22
1432          * @param IContextSource $context
1433          * @return array
1434          */
1435         public function getPermissionsError( IContextSource $context ) {
1436                 $blocker = $this->getBlocker();
1437                 if ( $blocker instanceof User ) { // local user
1438                         $blockerUserpage = $blocker->getUserPage();
1439                         $link = "[[{$blockerUserpage->getPrefixedText()}|{$blockerUserpage->getText()}]]";
1440                 } else { // foreign user
1441                         $link = $blocker;
1442                 }
1443
1444                 $reason = $this->mReason;
1445                 if ( $reason == '' ) {
1446                         $reason = $context->msg( 'blockednoreason' )->text();
1447                 }
1448
1449                 /* $ip returns who *is* being blocked, $intended contains who was meant to be blocked.
1450                  * This could be a username, an IP range, or a single IP. */
1451                 $intended = $this->getTarget();
1452
1453                 $lang = $context->getLanguage();
1454                 return array(
1455                         $this->mAuto ? 'autoblockedtext' : 'blockedtext',
1456                         $link,
1457                         $reason,
1458                         $context->getRequest()->getIP(),
1459                         $this->getByName(),
1460                         $this->getId(),
1461                         $lang->formatExpiry( $this->mExpiry ),
1462                         (string)$intended,
1463                         $lang->timeanddate( wfTimestamp( TS_MW, $this->mTimestamp ), true ),
1464                 );
1465         }
1466 }