includes/Block.php

   1 <?php
   2 /**
   3  * @file
   4  * Blocks and bans object
   5  */
   6
   7 /**
   8  * The block class
   9  * All the functions in this class assume the object is either explicitly
  10  * loaded or filled. It is not load-on-demand. There are no accessors.
  11  *
  12  * Globals used: $wgAutoblockExpiry, $wgAntiLockFlags
  13  *
  14  * @todo This could be used everywhere, but it isn't.
  15  * FIXME: this whole class is a cesspit, needs a complete rewrite
  16  */
  17 class Block {
  18         /* public*/ var $mUser, $mReason, $mTimestamp, $mAuto, $mExpiry,
  19                                 $mHideName,
  20                                 $mAngryAutoblock;
  21         protected
  22                 $mAddress,
  23                 $mId,
  24                 $mBy,
  25                 $mByName,
  26                 $mFromMaster,
  27                 $mRangeStart,
  28                 $mRangeEnd,
  29                 $mAnonOnly,
  30                 $mEnableAutoblock,
  31                 $mBlockEmail,
  32                 $mAllowUsertalk,
  33                 $mCreateAccount;
  34
  35         /// @var User|String
  36         protected $target;
  37
  38         /// @var Block::TYPE_ constant.  Can only be USER, IP or RANGE internally
  39         protected $type;
  40
  41         /// @var User
  42         protected $blocker;
  43
  44         # TYPE constants
  45         const TYPE_USER = 1;
  46         const TYPE_IP = 2;
  47         const TYPE_RANGE = 3;
  48         const TYPE_AUTO = 4;
  49         const TYPE_ID = 5;
  50
  51         /**
  52          * Constructor
  53          * FIXME: Don't know what the best format to have for this constructor is, but fourteen
  54          * optional parameters certainly isn't it.
  55          */
  56         function __construct( $address = '', $user = 0, $by = 0, $reason = '',
  57                 $timestamp = 0, $auto = 0, $expiry = '', $anonOnly = 0, $createAccount = 0, $enableAutoblock = 0,
  58                 $hideName = 0, $blockEmail = 0, $allowUsertalk = 0, $byName = false )
  59         {
  60                 if( $timestamp === 0 ){
  61                         $timestamp = wfTimestampNow();
  62                 }
  63
  64                 $this->mId = 0;
  65                 # Expand valid IPv6 addresses
  66                 $address = IP::sanitizeIP( $address );
  67                 $this->mAddress = $address;
  68                 $this->mUser = $user;
  69                 $this->mBy = $by;
  70                 $this->mReason = $reason;
  71                 $this->mTimestamp = wfTimestamp( TS_MW, $timestamp );
  72                 $this->mAuto = $auto;
  73                 $this->mAnonOnly = $anonOnly;
  74                 $this->mCreateAccount = $createAccount;
  75                 $this->mExpiry = $expiry;
  76                 $this->mEnableAutoblock = $enableAutoblock;
  77                 $this->mHideName = $hideName;
  78                 $this->mBlockEmail = $blockEmail;
  79                 $this->mAllowUsertalk = $allowUsertalk;
  80                 $this->mFromMaster = false;
  81                 $this->mByName = $byName;
  82                 $this->mAngryAutoblock = false;
  83                 $this->initialiseRange();
  84         }
  85
  86         /**
  87          * Load a block from the database, using either the IP address or
  88          * user ID. Tries the user ID first, and if that doesn't work, tries
  89          * the address.
  90          *
  91          * @param $address String: IP address of user/anon
  92          * @param $user Integer: user id of user
  93          * @param $killExpired Boolean: delete expired blocks on load
  94          * @return Block Object
  95          */
  96         public static function newFromDB( $address, $user = 0, $killExpired = true ) {
  97                 $block = new Block;
  98                 $block->load( $address, $user, $killExpired );
  99                 if ( $block->isValid() ) {
 100                         return $block;
 101                 } else {
 102                         return null;
 103                 }
 104         }
 105
 106         /**
 107          * Load a blocked user from their block id.
 108          *
 109          * @param $id Integer: Block id to search for
 110          * @return Block object
 111          */
 112         public static function newFromID( $id ) {
 113                 $dbr = wfGetDB( DB_SLAVE );
 114                 $res = $dbr->resultObject( $dbr->select( 'ipblocks', '*',
 115                         array( 'ipb_id' => $id ), __METHOD__ ) );
 116                 $block = new Block;
 117
 118                 if ( $block->loadFromResult( $res ) ) {
 119                         return $block;
 120                 } else {
 121                         return null;
 122                 }
 123         }
 124
 125         /**
 126          * Check if two blocks are effectively equal
 127          *
 128          * @return Boolean
 129          */
 130         public function equals( Block $block ) {
 131                 return (
 132                         $this->mAddress == $block->mAddress
 133                         && $this->mUser == $block->mUser
 134                         && $this->mAuto == $block->mAuto
 135                         && $this->mAnonOnly == $block->mAnonOnly
 136                         && $this->mCreateAccount == $block->mCreateAccount
 137                         && $this->mExpiry == $block->mExpiry
 138                         && $this->mEnableAutoblock == $block->mEnableAutoblock
 139                         && $this->mHideName == $block->mHideName
 140                         && $this->mBlockEmail == $block->mBlockEmail
 141                         && $this->mAllowUsertalk == $block->mAllowUsertalk
 142                         && $this->mReason == $block->mReason
 143                 );
 144         }
 145
 146         /**
 147          * Clear all member variables in the current object. Does not clear
 148          * the block from the DB.
 149          */
 150         public function clear() {
 151                 $this->mAddress = $this->mReason = $this->mTimestamp = '';
 152                 $this->mId = $this->mAnonOnly = $this->mCreateAccount =
 153                         $this->mEnableAutoblock = $this->mAuto = $this->mUser =
 154                         $this->mBy = $this->mHideName = $this->mBlockEmail = $this->mAllowUsertalk = 0;
 155                 $this->mByName = false;
 156         }
 157
 158         /**
 159          * Get a block from the DB, with either the given address or the given username
 160          *
 161          * @param $address string The IP address of the user, or blank to skip IP blocks
 162          * @param $user int The user ID, or zero for anonymous users
 163          * @param $killExpired bool Whether to delete expired rows while loading
 164          * @return Boolean: the user is blocked from editing
 165          * @deprecated since 1.18
 166          */
 167         public function load( $address = '', $user = 0, $killExpired = true ) {
 168                 wfDeprecated( __METHOD__ );
 169                 if( $user ){
 170                         $username = User::whoIs( $user );
 171                         $block = self::newFromTarget( $username, $address );
 172                 } else {
 173                         $block = self::newFromTarget( null, $address );
 174                 }
 175
 176                 if( $block instanceof Block ){
 177                         # This is mildly evil, but hey, it's B/C :D
 178                         foreach( $block as $variable => $value ){
 179                                 $this->$variable = $value;
 180                         }
 181                         return true;
 182                 } else {
 183                         return false;
 184                 }
 185         }
 186
 187         /**
 188          * Load a block from the database which affects the already-set $this->target:
 189          *     1) A block directly on the given user or IP
 190          *     2) A rangeblock encompasing the given IP (smallest first)
 191          *     3) An autoblock on the given IP
 192          * @param $vagueTarget User|String also search for blocks affecting this target.  Doesn't
 193          *     make any sense to use TYPE_AUTO / TYPE_ID here
 194          * @return Bool whether a relevant block was found
 195          */
 196         protected function newLoad( $vagueTarget = null ) {
 197                 $db = wfGetDB( $this->mFromMaster ? DB_MASTER : DB_SLAVE );
 198
 199                 if( $this->type !== null ){
 200                         $conds = array(
 201                                 'ipb_address' => array( (string)$this->target ),
 202                         );
 203                 } else {
 204                         $conds = array( 'ipb_address' => array() );
 205                 }
 206
 207                 if( $vagueTarget !== null ){
 208                         list( $target, $type ) = self::parseTarget( $vagueTarget );
 209                         switch( $type ) {
 210                                 case self::TYPE_USER:
 211                                         # Slightly wierd, but who are we to argue?
 212                                         $conds['ipb_address'][] = (string)$target;
 213                                         break;
 214
 215                                 case self::TYPE_IP:
 216                                         $conds['ipb_address'][] = (string)$target;
 217                                         $conds[] = self::getRangeCond( IP::toHex( $target ) );
 218                                         $conds = $db->makeList( $conds, LIST_OR );
 219                                         break;
 220
 221                                 case self::TYPE_RANGE:
 222                                         list( $start, $end ) = IP::parseRange( $target );
 223                                         $conds['ipb_address'][] = (string)$target;
 224                                         $conds[] = self::getRangeCond( $start, $end );
 225                                         $conds = $db->makeList( $conds, LIST_OR );
 226                                         break;
 227
 228                                 default:
 229                                         throw new MWException( "Tried to load block with invalid type" );
 230                         }
 231                 }
 232
 233                 $res = $db->select( 'ipblocks', '*', $conds, __METHOD__ );
 234
 235                 # This result could contain a block on the user, a block on the IP, and a russian-doll
 236                 # set of rangeblocks.  We want to choose the most specific one, so keep a leader board.
 237                 $bestRow = null;
 238
 239                 # Lower will be better
 240                 $bestBlockScore = 100;
 241
 242                 # This is begging for $this = $bestBlock, but that's not allowed in PHP :(
 243                 $bestBlockPreventsEdit = null;
 244
 245                 foreach( $res as $row ){
 246                         $block = Block::newFromRow( $row );
 247
 248                         # Don't use expired blocks
 249                         if( $block->deleteIfExpired() ){
 250                                 continue;
 251                         }
 252
 253                         # Don't use anon only blocks on users
 254                         if( $this->type == self::TYPE_USER && !$block->isHardblock() ){
 255                                 continue;
 256                         }
 257
 258                         if( $block->getType() == self::TYPE_RANGE ){
 259                                 # This is the number of bits that are allowed to vary in the block, give
 260                                 # or take some floating point errors
 261                                 $end = wfBaseconvert( $block->getRangeEnd(), 16, 10 );
 262                                 $start = wfBaseconvert( $block->getRangeStart(), 16, 10 );
 263                                 $size = log( $end - $start + 1, 2 );
 264
 265                                 # This has the nice property that a /32 block is ranked equally with a
 266                                 # single-IP block, which is exactly what it is...
 267                                 $score = self::TYPE_RANGE  - 1 + ( $size / 128 );
 268
 269                         } else {
 270                                 $score = $block->getType();
 271                         }
 272
 273                         if( $score < $bestBlockScore ){
 274                                 $bestBlockScore = $score;
 275                                 $bestRow = $row;
 276                                 $bestBlockPreventsEdit = $block->prevents( 'edit' );
 277                         }
 278                 }
 279
 280                 if( $bestRow !== null ){
 281                         $this->initFromRow( $bestRow );
 282                         $this->prevents( 'edit', $bestBlockPreventsEdit );
 283                         return true;
 284                 } else {
 285                         return false;
 286                 }
 287         }
 288
 289         /**
 290          * Get a set of SQL conditions which will select rangeblocks encompasing a given range
 291          * @param $start String Hexadecimal IP representation
 292          * @param $end String Hexadecimal IP represenation, or null to use $start = $end
 293          * @return String
 294          */
 295         public static function getRangeCond( $start, $end = null ) {
 296                 if ( $end === null ) {
 297                         $end = $start;
 298                 }
 299                 # Per bug 14634, we want to include relevant active rangeblocks; for
 300                 # rangeblocks, we want to include larger ranges which enclose the given
 301                 # range. We know that all blocks must be smaller than $wgBlockCIDRLimit,
 302                 # so we can improve performance by filtering on a LIKE clause
 303                 $chunk = self::getIpFragment( $start );
 304                 $dbr = wfGetDB( DB_SLAVE );
 305                 $like = $dbr->buildLike( $chunk, $dbr->anyString() );
 306
 307                 # Fairly hard to make a malicious SQL statement out of hex characters,
 308                 # but stranger things have happened...
 309                 $safeStart = $dbr->addQuotes( $start );
 310                 $safeEnd = $dbr->addQuotes( $end );
 311
 312                 return $dbr->makeList(
 313                         array(
 314                                 "ipb_range_start $like",
 315                                 "ipb_range_start <= $safeStart",
 316                                 "ipb_range_end >= $safeEnd",
 317                         ),
 318                         LIST_AND
 319                 );
 320         }
 321
 322         /**
 323          * Get the component of an IP address which is certain to be the same between an IP
 324          * address and a rangeblock containing that IP address.
 325          * @param  $hex String Hexadecimal IP representation
 326          * @return String
 327          */
 328         protected static function getIpFragment( $hex ) {
 329                 global $wgBlockCIDRLimit;
 330                 if ( substr( $hex, 0, 3 ) == 'v6-' ) {
 331                         return 'v6-' . substr( substr( $hex, 3 ), 0,  floor( $wgBlockCIDRLimit['IPv6'] / 4 ) );
 332                 } else {
 333                         return substr( $hex, 0,  floor( $wgBlockCIDRLimit['IPv4'] / 4 ) );
 334                 }
 335         }
 336
 337         /**
 338          * Fill in member variables from a result wrapper
 339          *
 340          * @param $res ResultWrapper: row from the ipblocks table
 341          * @param $killExpired Boolean: whether to delete expired rows while loading
 342          * @return Boolean
 343          */
 344         protected function loadFromResult( ResultWrapper $res, $killExpired = true ) {
 345                 $ret = false;
 346
 347                 if ( 0 != $res->numRows() ) {
 348                         # Get first block
 349                         $row = $res->fetchObject();
 350                         $this->initFromRow( $row );
 351
 352                         if ( $killExpired ) {
 353                                 # If requested, delete expired rows
 354                                 do {
 355                                         $killed = $this->deleteIfExpired();
 356                                         if ( $killed ) {
 357                                                 $row = $res->fetchObject();
 358                                                 if ( $row ) {
 359                                                         $this->initFromRow( $row );
 360                                                 }
 361                                         }
 362                                 } while ( $killed && $row );
 363
 364                                 # If there were any left after the killing finished, return true
 365                                 if ( $row ) {
 366                                         $ret = true;
 367                                 }
 368                         } else {
 369                                 $ret = true;
 370                         }
 371                 }
 372                 $res->free();
 373
 374                 return $ret;
 375         }
 376
 377         /**
 378          * Search the database for any range blocks matching the given address, and
 379          * load the row if one is found.
 380          *
 381          * @param $address String: IP address range
 382          * @param $killExpired Boolean: whether to delete expired rows while loading
 383          * @param $user Integer: if not 0, then sets ipb_anon_only
 384          * @return Boolean
 385          */
 386         protected function loadRange( $address, $killExpired = true, $user = 0 ) {
 387                 $iaddr = IP::toHex( $address );
 388
 389                 if ( $iaddr === false ) {
 390                         # Invalid address
 391                         return false;
 392                 }
 393
 394                 # Only scan ranges which start in this /16, this improves search speed
 395                 # Blocks should not cross a /16 boundary.
 396                 $range = substr( $iaddr, 0, 4 );
 397
 398                 $db = wfGetDB( $this->mFromMaster ? DB_MASTER : DB_SLAVE );
 399                 $conds = array(
 400                         'ipb_range_start' . $db->buildLike( $range, $db->anyString() ),
 401                         "ipb_range_start <= '$iaddr'",
 402                         "ipb_range_end >= '$iaddr'"
 403                 );
 404
 405                 if ( $user ) {
 406                         $conds['ipb_anon_only'] = 0;
 407                 }
 408
 409                 $res = $db->resultObject( $db->select( 'ipblocks', '*', $conds, __METHOD__ ) );
 410                 $success = $this->loadFromResult( $res, $killExpired );
 411
 412                 return $success;
 413         }
 414
 415         /**
 416          * Given a database row from the ipblocks table, initialize
 417          * member variables
 418          *
 419          * @param $row ResultWrapper: a row from the ipblocks table
 420          */
 421         protected function initFromRow( $row ) {
 422                 list( $this->target, $this->type ) = self::parseTarget( $row->ipb_address );
 423
 424                 $this->setTarget( $row->ipb_address );
 425                 $this->setBlocker( User::newFromId( $row->ipb_by ) );
 426
 427                 $this->mReason = $row->ipb_reason;
 428                 $this->mTimestamp = wfTimestamp( TS_MW, $row->ipb_timestamp );
 429                 $this->mAuto = $row->ipb_auto;
 430                 $this->mAnonOnly = $row->ipb_anon_only;
 431                 $this->mCreateAccount = $row->ipb_create_account;
 432                 $this->mEnableAutoblock = $row->ipb_enable_autoblock;
 433                 $this->mBlockEmail = $row->ipb_block_email;
 434                 $this->mAllowUsertalk = $row->ipb_allow_usertalk;
 435                 $this->mHideName = $row->ipb_deleted;
 436                 $this->mId = $row->ipb_id;
 437                 $this->mExpiry = $row->ipb_expiry;
 438                 $this->mRangeStart = $row->ipb_range_start;
 439                 $this->mRangeEnd = $row->ipb_range_end;
 440         }
 441
 442         /**
 443          * Create a new Block object from a database row
 444          * @param  $row ResultWrapper row from the ipblocks table
 445          * @return Block
 446          */
 447         public static function newFromRow( $row ){
 448                 $block = new Block;
 449                 $block->initFromRow( $row );
 450                 return $block;
 451         }
 452
 453         /**
 454          * Once $mAddress has been set, get the range they came from.
 455          * Wrapper for IP::parseRange
 456          */
 457         protected function initialiseRange() {
 458                 $this->mRangeStart = '';
 459                 $this->mRangeEnd = '';
 460
 461                 if ( $this->mUser == 0 ) {
 462                         list( $this->mRangeStart, $this->mRangeEnd ) = IP::parseRange( $this->mAddress );
 463                 }
 464         }
 465
 466         /**
 467          * Delete the row from the IP blocks table.
 468          *
 469          * @return Boolean
 470          */
 471         public function delete() {
 472                 if ( wfReadOnly() ) {
 473                         return false;
 474                 }
 475
 476                 if ( !$this->mId ) {
 477                         throw new MWException( "Block::delete() now requires that the mId member be filled\n" );
 478                 }
 479
 480                 $dbw = wfGetDB( DB_MASTER );
 481                 $dbw->delete( 'ipblocks', array( 'ipb_id' => $this->mId ), __METHOD__ );
 482
 483                 return $dbw->affectedRows() > 0;
 484         }
 485
 486         /**
 487          * Insert a block into the block table. Will fail if there is a conflicting
 488          * block (same name and options) already in the database.
 489          *
 490          * @return mixed: false on failure, assoc array on success:
 491          *      ('id' => block ID, 'autoId' => autoblock ID or false)
 492          */
 493         public function insert( $dbw = null ) {
 494                 wfDebug( "Block::insert; timestamp {$this->mTimestamp}\n" );
 495
 496                 if ( $dbw === null )
 497                         $dbw = wfGetDB( DB_MASTER );
 498
 499                 $this->validateBlockParams();
 500                 $this->initialiseRange();
 501
 502                 # Don't collide with expired blocks
 503                 Block::purgeExpired();
 504
 505                 $ipb_id = $dbw->nextSequenceValue( 'ipblocks_ipb_id_seq' );
 506                 $dbw->insert(
 507                         'ipblocks',
 508                         array(
 509                                 'ipb_id' => $ipb_id,
 510                                 'ipb_address' => $this->mAddress,
 511                                 'ipb_user' => $this->mUser,
 512                                 'ipb_by' => $this->mBy,
 513                                 'ipb_by_text' => $this->mByName,
 514                                 'ipb_reason' => $this->mReason,
 515                                 'ipb_timestamp' => $dbw->timestamp( $this->mTimestamp ),
 516                                 'ipb_auto' => $this->mAuto,
 517                                 'ipb_anon_only' => $this->mAnonOnly,
 518                                 'ipb_create_account' => $this->mCreateAccount,
 519                                 'ipb_enable_autoblock' => $this->mEnableAutoblock,
 520                                 'ipb_expiry' => $dbw->encodeExpiry( $this->mExpiry ),
 521                                 'ipb_range_start' => $this->mRangeStart,
 522                                 'ipb_range_end' => $this->mRangeEnd,
 523                                 'ipb_deleted'   => intval( $this->mHideName ), // typecast required for SQLite
 524                                 'ipb_block_email' => $this->mBlockEmail,
 525                                 'ipb_allow_usertalk' => $this->mAllowUsertalk
 526                         ),
 527                         'Block::insert',
 528                         array( 'IGNORE' )
 529                 );
 530                 $affected = $dbw->affectedRows();
 531
 532                 if ( $affected ) {
 533                         $auto_ipd_id = $this->doRetroactiveAutoblock();
 534                         return array( 'id' => $ipb_id, 'autoId' => $auto_ipd_id );
 535                 }
 536
 537                 return false;
 538         }
 539
 540         /**
 541          * Update a block in the DB with new parameters.
 542          * The ID field needs to be loaded first.
 543          */
 544         public function update() {
 545                 wfDebug( "Block::update; timestamp {$this->mTimestamp}\n" );
 546                 $dbw = wfGetDB( DB_MASTER );
 547
 548                 $this->validateBlockParams();
 549
 550                 $dbw->update(
 551                         'ipblocks',
 552                         array(
 553                                 'ipb_user' => $this->mUser,
 554                                 'ipb_by' => $this->mBy,
 555                                 'ipb_by_text' => $this->mByName,
 556                                 'ipb_reason' => $this->mReason,
 557                                 'ipb_timestamp' => $dbw->timestamp( $this->mTimestamp ),
 558                                 'ipb_auto' => $this->mAuto,
 559                                 'ipb_anon_only' => $this->mAnonOnly,
 560                                 'ipb_create_account' => $this->mCreateAccount,
 561                                 'ipb_enable_autoblock' => $this->mEnableAutoblock,
 562                                 'ipb_expiry' => $dbw->encodeExpiry( $this->mExpiry ),
 563                                 'ipb_range_start' => $this->mRangeStart,
 564                                 'ipb_range_end' => $this->mRangeEnd,
 565                                 'ipb_deleted'   => $this->mHideName,
 566                                 'ipb_block_email' => $this->mBlockEmail,
 567                                 'ipb_allow_usertalk' => $this->mAllowUsertalk
 568                         ),
 569                         array( 'ipb_id' => $this->mId ),
 570                         'Block::update'
 571                 );
 572
 573                 return $dbw->affectedRows();
 574         }
 575
 576         /**
 577          * Make sure all the proper members are set to sane values
 578          * before adding/updating a block
 579          */
 580         protected function validateBlockParams() {
 581                 # Unset ipb_anon_only for user blocks, makes no sense
 582                 if ( $this->mUser ) {
 583                         $this->mAnonOnly = 0;
 584                 }
 585
 586                 # Unset ipb_enable_autoblock for IP blocks, makes no sense
 587                 if ( !$this->mUser ) {
 588                         $this->mEnableAutoblock = 0;
 589                 }
 590
 591                 # bug 18860: non-anon-only IP blocks should be allowed to block email
 592                 if ( !$this->mUser && $this->mAnonOnly ) {
 593                         $this->mBlockEmail = 0;
 594                 }
 595
 596                 if ( !$this->mByName ) {
 597                         if ( $this->mBy ) {
 598                                 $this->mByName = User::whoIs( $this->mBy );
 599                         } else {
 600                                 global $wgUser;
 601                                 $this->mByName = $wgUser->getName();
 602                         }
 603                 }
 604         }
 605
 606         /**
 607          * Retroactively autoblocks the last IP used by the user (if it is a user)
 608          * blocked by this Block.
 609          *
 610          * @return mixed: block ID if a retroactive autoblock was made, false if not.
 611          */
 612         protected function doRetroactiveAutoblock() {
 613                 $dbr = wfGetDB( DB_SLAVE );
 614                 # If autoblock is enabled, autoblock the LAST IP used
 615                 # - stolen shamelessly from CheckUser_body.php
 616
 617                 if ( $this->mEnableAutoblock && $this->mUser ) {
 618                         wfDebug( "Doing retroactive autoblocks for " . $this->mAddress . "\n" );
 619
 620                         $options = array( 'ORDER BY' => 'rc_timestamp DESC' );
 621                         $conds = array( 'rc_user_text' => $this->mAddress );
 622
 623                         if ( $this->mAngryAutoblock ) {
 624                                 // Block any IP used in the last 7 days. Up to five IPs.
 625                                 $conds[] = 'rc_timestamp < ' . $dbr->addQuotes( $dbr->timestamp( time() - ( 7 * 86400 ) ) );
 626                                 $options['LIMIT'] = 5;
 627                         } else {
 628                                 // Just the last IP used.
 629                                 $options['LIMIT'] = 1;
 630                         }
 631
 632                         $res = $dbr->select( 'recentchanges', array( 'rc_ip' ), $conds,
 633                                 __METHOD__ ,  $options );
 634
 635                         if ( !$dbr->numRows( $res ) ) {
 636                                 # No results, don't autoblock anything
 637                                 wfDebug( "No IP found to retroactively autoblock\n" );
 638                         } else {
 639                                 foreach ( $res as $row ) {
 640                                         if ( $row->rc_ip ) {
 641                                                 return $this->doAutoblock( $row->rc_ip );
 642                                         }
 643                                 }
 644                         }
 645                 }
 646                 return false;
 647         }
 648
 649         /**
 650          * Checks whether a given IP is on the autoblock whitelist.
 651          *
 652          * @param $ip String: The IP to check
 653          * @return Boolean
 654          */
 655         public static function isWhitelistedFromAutoblocks( $ip ) {
 656                 global $wgMemc;
 657
 658                 // Try to get the autoblock_whitelist from the cache, as it's faster
 659                 // than getting the msg raw and explode()'ing it.
 660                 $key = wfMemcKey( 'ipb', 'autoblock', 'whitelist' );
 661                 $lines = $wgMemc->get( $key );
 662                 if ( !$lines ) {
 663                         $lines = explode( "\n", wfMsgForContentNoTrans( 'autoblock_whitelist' ) );
 664                         $wgMemc->set( $key, $lines, 3600 * 24 );
 665                 }
 666
 667                 wfDebug( "Checking the autoblock whitelist..\n" );
 668
 669                 foreach ( $lines as $line ) {
 670                         # List items only
 671                         if ( substr( $line, 0, 1 ) !== '*' ) {
 672                                 continue;
 673                         }
 674
 675                         $wlEntry = substr( $line, 1 );
 676                         $wlEntry = trim( $wlEntry );
 677
 678                         wfDebug( "Checking $ip against $wlEntry..." );
 679
 680                         # Is the IP in this range?
 681                         if ( IP::isInRange( $ip, $wlEntry ) ) {
 682                                 wfDebug( " IP $ip matches $wlEntry, not autoblocking\n" );
 683                                 return true;
 684                         } else {
 685                                 wfDebug( " No match\n" );
 686                         }
 687                 }
 688
 689                 return false;
 690         }
 691
 692         /**
 693          * Autoblocks the given IP, referring to this Block.
 694          *
 695          * @param $autoblockIP String: the IP to autoblock.
 696          * @param $justInserted Boolean: the main block was just inserted.
 697          * @return mixed: block ID if an autoblock was inserted, false if not.
 698          */
 699         public function doAutoblock( $autoblockIP, $justInserted = false ) {
 700                 # If autoblocks are disabled, go away.
 701                 if ( !$this->mEnableAutoblock ) {
 702                         return false;
 703                 }
 704
 705                 # Check for presence on the autoblock whitelist
 706                 if ( Block::isWhitelistedFromAutoblocks( $autoblockIP ) ) {
 707                         return false;
 708                 }
 709
 710                 # # Allow hooks to cancel the autoblock.
 711                 if ( !wfRunHooks( 'AbortAutoblock', array( $autoblockIP, &$this ) ) ) {
 712                         wfDebug( "Autoblock aborted by hook.\n" );
 713                         return false;
 714                 }
 715
 716                 # It's okay to autoblock. Go ahead and create/insert the block.
 717
 718                 $ipblock = Block::newFromTarget( $autoblockIP );
 719                 if ( $ipblock ) {
 720                         # If the user is already blocked. Then check if the autoblock would
 721                         # exceed the user block. If it would exceed, then do nothing, else
 722                         # prolong block time
 723                         if ( $this->mExpiry &&
 724                                 ( $this->mExpiry < Block::getAutoblockExpiry( $ipblock->mTimestamp ) )
 725                         ) {
 726                                 return false;
 727                         }
 728
 729                         # Just update the timestamp
 730                         if ( !$justInserted ) {
 731                                 $ipblock->updateTimestamp();
 732                         }
 733
 734                         return false;
 735                 } else {
 736                         $ipblock = new Block;
 737                 }
 738
 739                 # Make a new block object with the desired properties
 740                 wfDebug( "Autoblocking {$this->mAddress}@" . $autoblockIP . "\n" );
 741                 $ipblock->mAddress = $autoblockIP;
 742                 $ipblock->mUser = 0;
 743                 $ipblock->mBy = $this->mBy;
 744                 $ipblock->mByName = $this->mByName;
 745                 $ipblock->mReason = wfMsgForContent( 'autoblocker', $this->mAddress, $this->mReason );
 746                 $ipblock->mTimestamp = wfTimestampNow();
 747                 $ipblock->mAuto = 1;
 748                 $ipblock->mCreateAccount = $this->mCreateAccount;
 749                 # Continue suppressing the name if needed
 750                 $ipblock->mHideName = $this->mHideName;
 751                 $ipblock->mAllowUsertalk = $this->mAllowUsertalk;
 752
 753                 # If the user is already blocked with an expiry date, we don't
 754                 # want to pile on top of that!
 755                 if ( $this->mExpiry ) {
 756                         $ipblock->mExpiry = min( $this->mExpiry, Block::getAutoblockExpiry( $this->mTimestamp ) );
 757                 } else {
 758                         $ipblock->mExpiry = Block::getAutoblockExpiry( $this->mTimestamp );
 759                 }
 760
 761                 # Insert it
 762                 $status = $ipblock->insert();
 763                 return $status ? $status['id'] : false;
 764         }
 765
 766         /**
 767          * Check if a block has expired. Delete it if it is.
 768          * @return Boolean
 769          */
 770         public function deleteIfExpired() {
 771                 wfProfileIn( __METHOD__ );
 772
 773                 if ( $this->isExpired() ) {
 774                         wfDebug( "Block::deleteIfExpired() -- deleting\n" );
 775                         $this->delete();
 776                         $retVal = true;
 777                 } else {
 778                         wfDebug( "Block::deleteIfExpired() -- not expired\n" );
 779                         $retVal = false;
 780                 }
 781
 782                 wfProfileOut( __METHOD__ );
 783                 return $retVal;
 784         }
 785
 786         /**
 787          * Has the block expired?
 788          * @return Boolean
 789          */
 790         public function isExpired() {
 791                 wfDebug( "Block::isExpired() checking current " . wfTimestampNow() . " vs $this->mExpiry\n" );
 792
 793                 if ( !$this->mExpiry ) {
 794                         return false;
 795                 } else {
 796                         return wfTimestampNow() > $this->mExpiry;
 797                 }
 798         }
 799
 800         /**
 801          * Is the block address valid (i.e. not a null string?)
 802          * @return Boolean
 803          */
 804         public function isValid() {
 805                 return $this->mAddress != '';
 806         }
 807
 808         /**
 809          * Update the timestamp on autoblocks.
 810          */
 811         public function updateTimestamp() {
 812                 if ( $this->mAuto ) {
 813                         $this->mTimestamp = wfTimestamp();
 814                         $this->mExpiry = Block::getAutoblockExpiry( $this->mTimestamp );
 815
 816                         $dbw = wfGetDB( DB_MASTER );
 817                         $dbw->update( 'ipblocks',
 818                                 array( /* SET */
 819                                         'ipb_timestamp' => $dbw->timestamp( $this->mTimestamp ),
 820                                         'ipb_expiry' => $dbw->timestamp( $this->mExpiry ),
 821                                 ), array( /* WHERE */
 822                                         'ipb_address' => $this->mAddress
 823                                 ), 'Block::updateTimestamp'
 824                         );
 825                 }
 826         }
 827
 828         /**
 829          * Get the IP address at the start of the range in Hex form
 830          * @return String IP in Hex form
 831          */
 832         public function getRangeStart() {
 833                 switch( $this->type ) {
 834                         case self::TYPE_USER:
 835                                 return null;
 836                         case self::TYPE_IP:
 837                                 return IP::toHex( $this->target );
 838                         case self::TYPE_RANGE:
 839                                 return $this->mRangeStart;
 840                         default: throw new MWException( "Block with invalid type" );
 841                 }
 842         }
 843
 844         /**
 845          * Get the IP address at the start of the range in Hex form
 846          * @return String IP in Hex form
 847          */
 848         public function getRangeEnd() {
 849                 switch( $this->type ) {
 850                         case self::TYPE_USER:
 851                                 return null;
 852                         case self::TYPE_IP:
 853                                 return IP::toHex( $this->target );
 854                         case self::TYPE_RANGE:
 855                                 return $this->mRangeEnd;
 856                         default: throw new MWException( "Block with invalid type" );
 857                 }
 858         }
 859
 860         /**
 861          * Get the user id of the blocking sysop
 862          *
 863          * @return Integer
 864          */
 865         public function getBy() {
 866                 return $this->mBy;
 867         }
 868
 869         /**
 870          * Get the username of the blocking sysop
 871          *
 872          * @return String
 873          */
 874         public function getByName() {
 875                 return $this->mByName;
 876         }
 877
 878         /**
 879          * Get the block ID
 880          * @return int
 881          */
 882         public function getId() {
 883                 return $this->mId;
 884         }
 885
 886         /**
 887          * Get/set the SELECT ... FOR UPDATE flag
 888          * @deprecated since 1.18
 889          */
 890         public function forUpdate( $x = null ) {
 891                 # noop
 892         }
 893
 894         /**
 895          * Get/set a flag determining whether the master is used for reads
 896          */
 897         public function fromMaster( $x = null ) {
 898                 return wfSetVar( $this->mFromMaster, $x );
 899         }
 900
 901         /**
 902          * Get/set whether the Block is a hardblock (affects logged-in users on a given IP/range
 903          * @param $x Bool
 904          * @return  Bool
 905          */
 906         public function isHardblock( $x = null ) {
 907                 $y = $this->mAnonOnly;
 908                 if ( $x !== null ) {
 909                         $this->mAnonOnly = !$x;
 910                 }
 911                 return !$y;
 912         }
 913
 914         public function isAutoblocking( $x = null ) {
 915                 return wfSetVar( $this->mEnableAutoblock, $x );
 916         }
 917
 918         /**
 919          * Get/set whether the Block prevents a given action
 920          * @param $action String
 921          * @param $x Bool
 922          * @return Bool
 923          */
 924         public function prevents( $action, $x = null ) {
 925                 switch( $action ) {
 926                         case 'edit':
 927                                 # For now... <evil laugh>
 928                                 return true;
 929
 930                         case 'createaccount':
 931                                 return wfSetVar( $this->mCreateAccount, $x );
 932
 933                         case 'sendemail':
 934                                 return wfSetVar( $this->mBlockEmail, $x );
 935
 936                         case 'editownusertalk':
 937                                 $y = $this->mAllowUsertalk;
 938                                 if ( $x !== null ) {
 939                                         $this->mAllowUsertalk = !$x;
 940                                 }
 941                                 return !$y;
 942
 943                         default:
 944                                 return null;
 945                 }
 946         }
 947
 948         /**
 949          * Get the block name, but with autoblocked IPs hidden as per standard privacy policy
 950          * @return String, text is escaped
 951          */
 952         public function getRedactedName() {
 953                 if ( $this->mAuto ) {
 954                         return HTML::rawElement(
 955                                 'span',
 956                                 array( 'class' => 'mw-autoblockid' ),
 957                                 wfMessage( 'autoblockid', $this->mId )
 958                         );
 959                 } else {
 960                         return htmlspecialchars( $this->mAddress );
 961                 }
 962         }
 963
 964         /**
 965          * Encode expiry for DB
 966          *
 967          * @param $expiry String: timestamp for expiry, or
 968          * @param $db Database object
 969          * @return String
 970          * @deprecated since 1.18; use $dbw->encodeExpiry() instead
 971          */
 972         public static function encodeExpiry( $expiry, $db ) {
 973                 return $db->encodeExpiry( $expiry );
 974         }
 975
 976         /**
 977          * Decode expiry which has come from the DB
 978          *
 979          * @param $expiry String: Database expiry format
 980          * @param $timestampType Requested timestamp format
 981          * @return String
 982          * @deprecated since 1.18; use $wgLang->decodeExpiry() instead
 983          */
 984         public static function decodeExpiry( $expiry, $timestampType = TS_MW ) {
 985                 global $wgContLang;
 986                 return $wgContLang->formatExpiry( $expiry, $timestampType );
 987         }
 988
 989         /**
 990          * Get a timestamp of the expiry for autoblocks
 991          *
 992          * @return String
 993          */
 994         public static function getAutoblockExpiry( $timestamp ) {
 995                 global $wgAutoblockExpiry;
 996
 997                 return wfTimestamp( TS_MW, wfTimestamp( TS_UNIX, $timestamp ) + $wgAutoblockExpiry );
 998         }
 999
1000         /**
1001          * Gets rid of uneeded numbers in quad-dotted/octet IP strings
1002          * For example, 127.111.113.151/24 -> 127.111.113.0/24
1003          * @param $range String: IP address to normalize
1004          * @return string
1005          * @deprecated since 1.18, call IP::sanitizeRange() directly
1006          */
1007         public static function normaliseRange( $range ) {
1008                 return IP::sanitizeRange( $range );
1009         }
1010
1011         /**
1012          * Purge expired blocks from the ipblocks table
1013          */
1014         public static function purgeExpired() {
1015                 $dbw = wfGetDB( DB_MASTER );
1016                 $dbw->delete( 'ipblocks', array( 'ipb_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ), __METHOD__ );
1017         }
1018
1019         /**
1020          * Get a value to insert into expiry field of the database when infinite expiry
1021          * is desired
1022          * @deprecated since 1.18, call $dbr->getInfinity() directly
1023          * @return String
1024          */
1025         public static function infinity() {
1026                 return wfGetDB( DB_SLAVE )->getInfinity();
1027         }
1028
1029         /**
1030          * Convert a DB-encoded expiry into a real string that humans can read.
1031          *
1032          * @param $encoded_expiry String: Database encoded expiry time
1033          * @return Html-escaped String
1034          * @deprecated since 1.18; use $wgLang->formatExpiry() instead
1035          */
1036         public static function formatExpiry( $encoded_expiry ) {
1037                 global $wgContLang;
1038                 static $msg = null;
1039
1040                 if ( is_null( $msg ) ) {
1041                         $msg = array();
1042                         $keys = array( 'infiniteblock', 'expiringblock' );
1043
1044                         foreach ( $keys as $key ) {
1045                                 $msg[$key] = wfMsgHtml( $key );
1046                         }
1047                 }
1048
1049                 $expiry = $wgContLang->formatExpiry( $encoded_expiry, TS_MW );
1050                 if ( $expiry == wfGetDB( DB_SLAVE )->getInfinity() ) {
1051                         $expirystr = $msg['infiniteblock'];
1052                 } else {
1053                         global $wgLang;
1054                         $expiredatestr = htmlspecialchars( $wgLang->date( $expiry, true ) );
1055                         $expiretimestr = htmlspecialchars( $wgLang->time( $expiry, true ) );
1056                         $expirystr = wfMsgReplaceArgs( $msg['expiringblock'], array( $expiredatestr, $expiretimestr ) );
1057                 }
1058
1059                 return $expirystr;
1060         }
1061
1062         # FIXME: everything above here is a mess, needs much cleaning up
1063
1064         /**
1065          * Convert a submitted expiry time, which may be relative ("2 weeks", etc) or absolute
1066          * ("24 May 2034"), into an absolute timestamp we can put into the database.
1067          * @param $expiry String: whatever was typed into the form
1068          * @return String: timestamp or "infinity" string for th DB implementation
1069          * @deprecated since 1.18 moved to SpecialBlock::parseExpiryInput()
1070          */
1071         public static function parseExpiryInput( $expiry ) {
1072                 wfDeprecated( __METHOD__ );
1073                 return SpecialBlock::parseExpiryInput( $expiry );
1074         }
1075
1076         /**
1077          * Given a target and the target's type, get an existing Block object if possible.
1078          * @param $specificTarget String|User|Int a block target, which may be one of several types:
1079          *     * A user to block, in which case $target will be a User
1080          *     * An IP to block, in which case $target will be a User generated by using
1081          *       User::newFromName( $ip, false ) to turn off name validation
1082          *     * An IP range, in which case $target will be a String "123.123.123.123/18" etc
1083          *     * The ID of an existing block, in the format "#12345" (since pure numbers are valid
1084          *       usernames
1085          *     Calling this with a user, IP address or range will not select autoblocks, and will
1086          *     only select a block where the targets match exactly (so looking for blocks on
1087          *     1.2.3.4 will not select 1.2.0.0/16 or even 1.2.3.4/32)
1088          * @param $vagueTarget String|User|Int as above, but we will search for *any* block which
1089          *     affects that target (so for an IP address, get ranges containing that IP; and also
1090          *     get any relevant autoblocks)
1091          * @param $fromMaster Bool whether to use the DB_MASTER database
1092          * @return Block|null (null if no relevant block could be found).  The target and type
1093          *     of the returned Block will refer to the actual block which was found, which might
1094          *     not be the same as the target you gave if you used $vagueTarget!
1095          */
1096         public static function newFromTarget( $specificTarget, $vagueTarget = null, $fromMaster = false ) {
1097                 list( $target, $type ) = self::parseTarget( $specificTarget );
1098                 if( $type == Block::TYPE_ID || $type == Block::TYPE_AUTO ){
1099                         return Block::newFromID( $target );
1100
1101                 } elseif( in_array( $type, array( Block::TYPE_USER, Block::TYPE_IP, Block::TYPE_RANGE, null ) ) ) {
1102                         $block = new Block();
1103                         $block->fromMaster( $fromMaster );
1104
1105                         if( $type !== null ){
1106                                 $block->setTarget( $target );
1107                         }
1108
1109                         if( $block->newLoad( $vagueTarget ) ){
1110                                 return $block;
1111                         } else {
1112                                 return null;
1113                         }
1114                 } else {
1115                         return null;
1116                 }
1117         }
1118
1119         /**
1120          * From an existing Block, get the target and the type of target.  Note that it is
1121          * always safe to treat the target as a string; for User objects this will return
1122          * User::__toString() which in turn gives User::getName().
1123          * @return array( User|String, Block::TYPE_ constant )
1124          */
1125         public static function parseTarget( $target ) {
1126                 $target = trim( $target );
1127
1128                 # We may have been through this before
1129                 if( $target instanceof User ){
1130                         if( IP::isValid( $target->getName() ) ){
1131                                 return self::TYPE_IP;
1132                         } else {
1133                                 return self::TYPE_USER;
1134                         }
1135                 } elseif( $target === null ){
1136                         return array( null, null );
1137                 }
1138
1139                 $userObj = User::newFromName( $target );
1140                 if ( $userObj instanceof User ) {
1141                         # Note that since numbers are valid usernames, a $target of "12345" will be
1142                         # considered a User.  If you want to pass a block ID, prepend a hash "#12345",
1143                         # since hash characters are not valid in usernames or titles generally.
1144                         return array( $userObj, Block::TYPE_USER );
1145
1146                 } elseif ( IP::isValid( $target ) ) {
1147                         # We can still create a User if it's an IP address, but we need to turn
1148                         # off validation checking (which would exclude IP addresses)
1149                         return array(
1150                                 User::newFromName( IP::sanitizeIP( $target ), false ),
1151                                 Block::TYPE_IP
1152                         );
1153
1154                 } elseif ( IP::isValidBlock( $target ) ) {
1155                         # Can't create a User from an IP range
1156                         return array( IP::sanitizeRange( $target ), Block::TYPE_RANGE );
1157
1158                 } elseif ( preg_match( '/^#\d+$/', $target ) ) {
1159                         # Autoblock reference in the form "#12345"
1160                         return array( substr( $target, 1 ), Block::TYPE_AUTO );
1161
1162                 } else {
1163                         # WTF?
1164                         return array( null, null );
1165                 }
1166         }
1167
1168         /**
1169          * Get the type of target for this particular block
1170          * @return Block::TYPE_ constant, will never be TYPE_ID
1171          */
1172         public function getType() {
1173                 return $this->mAuto
1174                         ? self::TYPE_AUTO
1175                         : $this->type;
1176         }
1177
1178         /**
1179          * Get the target and target type for this particular Block.  Note that for autoblocks,
1180          * this returns the unredacted name; frontend functions need to call $block->getRedactedName()
1181          * in this situation.
1182          * @return array( User|String, Block::TYPE_ constant )
1183          * FIXME: this should be an integral part of the Block member variables
1184          */
1185         public function getTargetAndType() {
1186                 return array( $this->getTarget(), $this->getType() );
1187         }
1188
1189         /**
1190          * Get the target for this particular Block.  Note that for autoblocks,
1191          * this returns the unredacted name; frontend functions need to call $block->getRedactedName()
1192          * in this situation.
1193          * @return User|String
1194          */
1195         public function getTarget() {
1196                 return $this->target;
1197         }
1198
1199         /**
1200          * Set the target for this block, and update $this->type accordingly
1201          * @param $target Mixed
1202          */
1203         public function setTarget( $target ){
1204                 list( $this->target, $this->type ) = self::parseTarget( $target );
1205
1206                 $this->mAddress = (string)$this->target;
1207                 if( $this->type == self::TYPE_USER ){
1208                         if( $this->target instanceof User ){
1209                                 # Cheat
1210                                 $this->mUser = $this->target->getID();
1211                         } else {
1212                                 $this->mUser = User::idFromName( $this->target );
1213                         }
1214                 } else {
1215                         $this->mUser = 0;
1216                 }
1217         }
1218
1219         /**
1220          * Get the user who implemented this block
1221          * @return User
1222          */
1223         public function getBlocker(){
1224                 return $this->blocker;
1225         }
1226
1227         /**
1228          * Set the user who implemented (or will implement) this block
1229          * @param $user User
1230          */
1231         public function setBlocker( User $user ){
1232                 $this->blocker = $user;
1233
1234                 $this->mBy = $user->getID();
1235                 $this->mByName = $user->getName();
1236         }
1237 }