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  */
  16 class Block
  17 {
  18         /* public*/ var $mAddress, $mUser, $mBy, $mReason, $mTimestamp, $mAuto, $mId, $mExpiry,
  19                                 $mRangeStart, $mRangeEnd, $mAnonOnly, $mEnableAutoblock, $mHideName,
  20                                 $mBlockEmail, $mByName, $mAngryAutoblock;
  21         /* private */ var $mNetworkBits, $mIntegerAddr, $mForUpdate, $mFromMaster;
  22
  23         const EB_KEEP_EXPIRED = 1;
  24         const EB_FOR_UPDATE = 2;
  25         const EB_RANGE_ONLY = 4;
  26
  27         function __construct( $address = '', $user = 0, $by = 0, $reason = '',
  28                 $timestamp = '' , $auto = 0, $expiry = '', $anonOnly = 0, $createAccount = 0, $enableAutoblock = 0,
  29                 $hideName = 0, $blockEmail = 0 )
  30         {
  31                 $this->mId = 0;
  32                 # Expand valid IPv6 addresses
  33                 $address = IP::sanitizeIP( $address );
  34                 $this->mAddress = $address;
  35                 $this->mUser = $user;
  36                 $this->mBy = $by;
  37                 $this->mReason = $reason;
  38                 $this->mTimestamp = wfTimestamp(TS_MW,$timestamp);
  39                 $this->mAuto = $auto;
  40                 $this->mAnonOnly = $anonOnly;
  41                 $this->mCreateAccount = $createAccount;
  42                 $this->mExpiry = self::decodeExpiry( $expiry );
  43                 $this->mEnableAutoblock = $enableAutoblock;
  44                 $this->mHideName = $hideName;
  45                 $this->mBlockEmail = $blockEmail;
  46                 $this->mForUpdate = false;
  47                 $this->mFromMaster = false;
  48                 $this->mByName = false;
  49                 $this->mAngryAutoblock = false;
  50                 $this->initialiseRange();
  51         }
  52
  53         static function newFromDB( $address, $user = 0, $killExpired = true )
  54         {
  55                 $block = new Block();
  56                 $block->load( $address, $user, $killExpired );
  57                 if ( $block->isValid() ) {
  58                         return $block;
  59                 } else {
  60                         return null;
  61                 }
  62         }
  63
  64         static function newFromID( $id )
  65         {
  66                 $dbr = wfGetDB( DB_SLAVE );
  67                 $res = $dbr->resultObject( $dbr->select( 'ipblocks', '*',
  68                         array( 'ipb_id' => $id ), __METHOD__ ) );
  69                 $block = new Block;
  70                 if ( $block->loadFromResult( $res ) ) {
  71                         return $block;
  72                 } else {
  73                         return null;
  74                 }
  75         }
  76
  77         function clear()
  78         {
  79                 $this->mAddress = $this->mReason = $this->mTimestamp = '';
  80                 $this->mId = $this->mAnonOnly = $this->mCreateAccount =
  81                         $this->mEnableAutoblock = $this->mAuto = $this->mUser =
  82                         $this->mBy = $this->mHideName = $this->mBlockEmail = 0;
  83                 $this->mByName = false;
  84         }
  85
  86         /**
  87          * Get the DB object and set the reference parameter to the query options
  88          */
  89         function &getDBOptions( &$options )
  90         {
  91                 global $wgAntiLockFlags;
  92                 if ( $this->mForUpdate || $this->mFromMaster ) {
  93                         $db = wfGetDB( DB_MASTER );
  94                         if ( !$this->mForUpdate || ($wgAntiLockFlags & ALF_NO_BLOCK_LOCK) ) {
  95                                 $options = array();
  96                         } else {
  97                                 $options = array( 'FOR UPDATE' );
  98                         }
  99                 } else {
 100                         $db = wfGetDB( DB_SLAVE );
 101                         $options = array();
 102                 }
 103                 return $db;
 104         }
 105
 106         /**
 107          * Get a ban from the DB, with either the given address or the given username
 108          *
 109          * @param string $address The IP address of the user, or blank to skip IP blocks
 110          * @param integer $user The user ID, or zero for anonymous users
 111          * @param bool $killExpired Whether to delete expired rows while loading
 112          *
 113          */
 114         function load( $address = '', $user = 0, $killExpired = true )
 115         {
 116                 wfDebug( "Block::load: '$address', '$user', $killExpired\n" );
 117
 118                 $options = array();
 119                 $db =& $this->getDBOptions( $options );
 120
 121                 if ( 0 == $user && $address == '' ) {
 122                         # Invalid user specification, not blocked
 123                         $this->clear();
 124                         return false;
 125                 }
 126
 127                 # Try user block
 128                 if ( $user ) {
 129                         $res = $db->resultObject( $db->select( 'ipblocks', '*', array( 'ipb_user' => $user ),
 130                                 __METHOD__, $options ) );
 131                         if ( $this->loadFromResult( $res, $killExpired ) ) {
 132                                 return true;
 133                         }
 134                 }
 135
 136                 # Try IP block
 137                 # TODO: improve performance by merging this query with the autoblock one
 138                 # Slightly tricky while handling killExpired as well
 139                 if ( $address ) {
 140                         $conds = array( 'ipb_address' => $address, 'ipb_auto' => 0 );
 141                         $res = $db->resultObject( $db->select( 'ipblocks', '*', $conds, __METHOD__, $options ) );
 142                         if ( $this->loadFromResult( $res, $killExpired ) ) {
 143                                 if ( $user && $this->mAnonOnly ) {
 144                                         # Block is marked anon-only
 145                                         # Whitelist this IP address against autoblocks and range blocks
 146                                         $this->clear();
 147                                         return false;
 148                                 } else {
 149                                         return true;
 150                                 }
 151                         }
 152                 }
 153
 154                 # Try range block
 155                 if ( $this->loadRange( $address, $killExpired, $user ) ) {
 156                         if ( $user && $this->mAnonOnly ) {
 157                                 $this->clear();
 158                                 return false;
 159                         } else {
 160                                 return true;
 161                         }
 162                 }
 163
 164                 # Try autoblock
 165                 if ( $address ) {
 166                         $conds = array( 'ipb_address' => $address, 'ipb_auto' => 1 );
 167                         if ( $user ) {
 168                                 $conds['ipb_anon_only'] = 0;
 169                         }
 170                         $res = $db->resultObject( $db->select( 'ipblocks', '*', $conds, __METHOD__, $options ) );
 171                         if ( $this->loadFromResult( $res, $killExpired ) ) {
 172                                 return true;
 173                         }
 174                 }
 175
 176                 # Give up
 177                 $this->clear();
 178                 return false;
 179         }
 180
 181         /**
 182          * Fill in member variables from a result wrapper
 183          */
 184         function loadFromResult( ResultWrapper $res, $killExpired = true )
 185         {
 186                 $ret = false;
 187                 if ( 0 != $res->numRows() ) {
 188                         # Get first block
 189                         $row = $res->fetchObject();
 190                         $this->initFromRow( $row );
 191
 192                         if ( $killExpired ) {
 193                                 # If requested, delete expired rows
 194                                 do {
 195                                         $killed = $this->deleteIfExpired();
 196                                         if ( $killed ) {
 197                                                 $row = $res->fetchObject();
 198                                                 if ( $row ) {
 199                                                         $this->initFromRow( $row );
 200                                                 }
 201                                         }
 202                                 } while ( $killed && $row );
 203
 204                                 # If there were any left after the killing finished, return true
 205                                 if ( $row ) {
 206                                         $ret = true;
 207                                 }
 208                         } else {
 209                                 $ret = true;
 210                         }
 211                 }
 212                 $res->free();
 213                 return $ret;
 214         }
 215
 216         /**
 217          * Search the database for any range blocks matching the given address, and
 218          * load the row if one is found.
 219          */
 220         function loadRange( $address, $killExpired = true, $user = 0 )
 221         {
 222                 $iaddr = IP::toHex( $address );
 223                 if ( $iaddr === false ) {
 224                         # Invalid address
 225                         return false;
 226                 }
 227
 228                 # Only scan ranges which start in this /16, this improves search speed
 229                 # Blocks should not cross a /16 boundary.
 230                 $range = substr( $iaddr, 0, 4 );
 231
 232                 $options = array();
 233                 $db =& $this->getDBOptions( $options );
 234                 $conds = array(
 235                         "ipb_range_start LIKE '$range%'",
 236                         "ipb_range_start <= '$iaddr'",
 237                         "ipb_range_end >= '$iaddr'"
 238                 );
 239
 240                 if ( $user ) {
 241                         $conds['ipb_anon_only'] = 0;
 242                 }
 243
 244                 $res = $db->resultObject( $db->select( 'ipblocks', '*', $conds, __METHOD__, $options ) );
 245                 $success = $this->loadFromResult( $res, $killExpired );
 246                 return $success;
 247         }
 248
 249         /**
 250          * Determine if a given integer IPv4 address is in a given CIDR network
 251          * @deprecated Use IP::isInRange
 252          */
 253         function isAddressInRange( $addr, $range ) {
 254                 return IP::isInRange( $addr, $range );
 255         }
 256
 257         function initFromRow( $row )
 258         {
 259                 $this->mAddress = $row->ipb_address;
 260                 $this->mReason = $row->ipb_reason;
 261                 $this->mTimestamp = wfTimestamp(TS_MW,$row->ipb_timestamp);
 262                 $this->mUser = $row->ipb_user;
 263                 $this->mBy = $row->ipb_by;
 264                 $this->mAuto = $row->ipb_auto;
 265                 $this->mAnonOnly = $row->ipb_anon_only;
 266                 $this->mCreateAccount = $row->ipb_create_account;
 267                 $this->mEnableAutoblock = $row->ipb_enable_autoblock;
 268                 $this->mBlockEmail = $row->ipb_block_email;
 269                 $this->mHideName = $row->ipb_deleted;
 270                 $this->mId = $row->ipb_id;
 271                 $this->mExpiry = self::decodeExpiry( $row->ipb_expiry );
 272                 if ( isset( $row->user_name ) ) {
 273                         $this->mByName = $row->user_name;
 274                 } else {
 275                         $this->mByName = $row->ipb_by_text;
 276                 }
 277                 $this->mRangeStart = $row->ipb_range_start;
 278                 $this->mRangeEnd = $row->ipb_range_end;
 279         }
 280
 281         function initialiseRange()
 282         {
 283                 $this->mRangeStart = '';
 284                 $this->mRangeEnd = '';
 285
 286                 if ( $this->mUser == 0 ) {
 287                         list( $this->mRangeStart, $this->mRangeEnd ) = IP::parseRange( $this->mAddress );
 288                 }
 289         }
 290
 291         /**
 292          * Callback with a Block object for every block
 293          * @return integer number of blocks;
 294          */
 295         /*static*/ function enumBlocks( $callback, $tag, $flags = 0 )
 296         {
 297                 global $wgAntiLockFlags;
 298
 299                 $block = new Block();
 300                 if ( $flags & Block::EB_FOR_UPDATE ) {
 301                         $db = wfGetDB( DB_MASTER );
 302                         if ( $wgAntiLockFlags & ALF_NO_BLOCK_LOCK ) {
 303                                 $options = '';
 304                         } else {
 305                                 $options = 'FOR UPDATE';
 306                         }
 307                         $block->forUpdate( true );
 308                 } else {
 309                         $db = wfGetDB( DB_SLAVE );
 310                         $options = '';
 311                 }
 312                 if ( $flags & Block::EB_RANGE_ONLY ) {
 313                         $cond = " AND ipb_range_start <> ''";
 314                 } else {
 315                         $cond = '';
 316                 }
 317
 318                 $now = wfTimestampNow();
 319
 320                 list( $ipblocks, $user ) = $db->tableNamesN( 'ipblocks', 'user' );
 321
 322                 $sql = "SELECT $ipblocks.*,user_name FROM $ipblocks,$user " .
 323                         "WHERE user_id=ipb_by $cond ORDER BY ipb_timestamp DESC $options";
 324                 $res = $db->query( $sql, 'Block::enumBlocks' );
 325                 $num_rows = $db->numRows( $res );
 326
 327                 while ( $row = $db->fetchObject( $res ) ) {
 328                         $block->initFromRow( $row );
 329                         if ( ( $flags & Block::EB_RANGE_ONLY ) && $block->mRangeStart == '' ) {
 330                                 continue;
 331                         }
 332
 333                         if ( !( $flags & Block::EB_KEEP_EXPIRED ) ) {
 334                                 if ( $block->mExpiry && $now > $block->mExpiry ) {
 335                                         $block->delete();
 336                                 } else {
 337                                         call_user_func( $callback, $block, $tag );
 338                                 }
 339                         } else {
 340                                 call_user_func( $callback, $block, $tag );
 341                         }
 342                 }
 343                 $db->freeResult( $res );
 344                 return $num_rows;
 345         }
 346
 347         function delete()
 348         {
 349                 if (wfReadOnly()) {
 350                         return false;
 351                 }
 352                 if ( !$this->mId ) {
 353                         throw new MWException( "Block::delete() now requires that the mId member be filled\n" );
 354                 }
 355
 356                 $dbw = wfGetDB( DB_MASTER );
 357                 $dbw->delete( 'ipblocks', array( 'ipb_id' => $this->mId ), __METHOD__ );
 358                 return $dbw->affectedRows() > 0;
 359         }
 360
 361         /**
 362         * Insert a block into the block table.
 363         * @return Whether or not the insertion was successful.
 364         */
 365         function insert()
 366         {
 367                 wfDebug( "Block::insert; timestamp {$this->mTimestamp}\n" );
 368                 $dbw = wfGetDB( DB_MASTER );
 369
 370                 # Unset ipb_anon_only for user blocks, makes no sense
 371                 if ( $this->mUser ) {
 372                         $this->mAnonOnly = 0;
 373                 }
 374
 375                 # Unset ipb_enable_autoblock for IP blocks, makes no sense
 376                 if ( !$this->mUser ) {
 377                         $this->mEnableAutoblock = 0;
 378                         $this->mBlockEmail = 0; //Same goes for email...
 379                 }
 380
 381                 if( !$this->mByName ) {
 382                         if( $this->mBy ) {
 383                                 $this->mByName = User::whoIs( $this->mBy );
 384                         } else {
 385                                 global $wgUser;
 386                                 $this->mByName = $wgUser->getName();
 387                         }
 388                 }
 389
 390                 # Don't collide with expired blocks
 391                 Block::purgeExpired();
 392
 393                 $ipb_id = $dbw->nextSequenceValue('ipblocks_ipb_id_val');
 394                 $dbw->insert( 'ipblocks',
 395                         array(
 396                                 'ipb_id' => $ipb_id,
 397                                 'ipb_address' => $this->mAddress,
 398                                 'ipb_user' => $this->mUser,
 399                                 'ipb_by' => $this->mBy,
 400                                 'ipb_by_text' => $this->mByName,
 401                                 'ipb_reason' => $this->mReason,
 402                                 'ipb_timestamp' => $dbw->timestamp($this->mTimestamp),
 403                                 'ipb_auto' => $this->mAuto,
 404                                 'ipb_anon_only' => $this->mAnonOnly,
 405                                 'ipb_create_account' => $this->mCreateAccount,
 406                                 'ipb_enable_autoblock' => $this->mEnableAutoblock,
 407                                 'ipb_expiry' => self::encodeExpiry( $this->mExpiry, $dbw ),
 408                                 'ipb_range_start' => $this->mRangeStart,
 409                                 'ipb_range_end' => $this->mRangeEnd,
 410                                 'ipb_deleted'   => $this->mHideName,
 411                                 'ipb_block_email' => $this->mBlockEmail
 412                         ), 'Block::insert', array( 'IGNORE' )
 413                 );
 414                 $affected = $dbw->affectedRows();
 415
 416                 if ($affected)
 417                         $this->doRetroactiveAutoblock();
 418
 419                 return $affected;
 420         }
 421
 422         /**
 423         * Retroactively autoblocks the last IP used by the user (if it is a user)
 424         * blocked by this Block.
 425         *@return Whether or not a retroactive autoblock was made.
 426         */
 427         function doRetroactiveAutoblock() {
 428                 $dbr = wfGetDB( DB_SLAVE );
 429                 #If autoblock is enabled, autoblock the LAST IP used
 430                 # - stolen shamelessly from CheckUser_body.php
 431
 432                 if ($this->mEnableAutoblock && $this->mUser) {
 433                         wfDebug("Doing retroactive autoblocks for " . $this->mAddress . "\n");
 434
 435                         $options = array( 'ORDER BY' => 'rc_timestamp DESC' );
 436                         $conds = array( 'rc_user_text' => $this->mAddress );
 437
 438                         if ($this->mAngryAutoblock) {
 439                                 // Block any IP used in the last 7 days. Up to five IPs.
 440                                 $conds[] = 'rc_timestamp < ' . $dbr->addQuotes( $dbr->timestamp( time() - (7*86400) ) );
 441                                 $options['LIMIT'] = 5;
 442                         } else {
 443                                 // Just the last IP used.
 444                                 $options['LIMIT'] = 1;
 445                         }
 446
 447                         $res = $dbr->select( 'recentchanges', array( 'rc_ip' ), $conds,
 448                                 __METHOD__ ,  $options);
 449
 450                         if ( !$dbr->numRows( $res ) ) {
 451                                 #No results, don't autoblock anything
 452                                 wfDebug("No IP found to retroactively autoblock\n");
 453                         } else {
 454                                 while ( $row = $dbr->fetchObject( $res ) ) {
 455                                         if ( $row->rc_ip )
 456                                                 $this->doAutoblock( $row->rc_ip );
 457                                 }
 458                         }
 459                 }
 460         }
 461
 462         /**
 463          * Checks whether a given IP is on the autoblock whitelist.
 464          * @param string $autoblockip The IP to check
 465          */
 466         function isWhitelistedFromAutoblocks( $ip ) {
 467                 # TODO cache this?
 468                 $lines = explode( "\n", wfMsgForContentNoTrans( 'autoblock_whitelist' ) );
 469
 470                 wfDebug("Checking the autoblock whitelist..\n");
 471
 472                 foreach( $lines as $line ) {
 473                         # List items only
 474                         if ( substr( $line, 0, 1 ) !== '*' ) {
 475                                 continue;
 476                         }
 477
 478                         $wlEntry = substr($line, 1);
 479                         $wlEntry = trim($wlEntry);
 480
 481                         wfDebug("Checking $ip against $wlEntry...");
 482
 483                         # Is the IP in this range?
 484                         if (IP::isInRange( $ip, $wlEntry )) {
 485                                 wfDebug(" IP $ip matches $wlEntry, not autoblocking\n");
 486                                 return true;
 487                         } else {
 488                                 wfDebug( " No match\n" );
 489                         }
 490                 }
 491
 492                 return false;
 493         }
 494
 495         /**
 496         * Autoblocks the given IP, referring to this Block.
 497         * @param string $autoblockip The IP to autoblock.
 498         * @param bool $justInserted The main block was just inserted
 499         * @return bool Whether or not an autoblock was inserted.
 500         */
 501         function doAutoblock( $autoblockip, $justInserted = false ) {
 502                 # If autoblocks are disabled, go away.
 503                 if ( !$this->mEnableAutoblock ) {
 504                         return;
 505                 }
 506
 507                 # Check for presence on the autoblock whitelist
 508                 if (Block::isWhitelistedFromAutoblocks($autoblockip)) {
 509                         return;
 510                 }
 511
 512                 ## Allow hooks to cancel the autoblock.
 513                 if (!wfRunHooks( 'AbortAutoblock', array( $autoblockip, &$this ) )) {
 514                         wfDebug( "Autoblock aborted by hook." );
 515                         return false;
 516                 }
 517
 518                 # It's okay to autoblock. Go ahead and create/insert the block.
 519
 520                 $ipblock = Block::newFromDB( $autoblockip );
 521                 if ( $ipblock ) {
 522                         # If the user is already blocked. Then check if the autoblock would
 523                         # exceed the user block. If it would exceed, then do nothing, else
 524                         # prolong block time
 525                         if ($this->mExpiry &&
 526                         ($this->mExpiry < Block::getAutoblockExpiry($ipblock->mTimestamp))) {
 527                                 return;
 528                         }
 529                         # Just update the timestamp
 530                         if ( !$justInserted ) {
 531                                 $ipblock->updateTimestamp();
 532                         }
 533                         return;
 534                 } else {
 535                         $ipblock = new Block;
 536                 }
 537
 538                 # Make a new block object with the desired properties
 539                 wfDebug( "Autoblocking {$this->mAddress}@" . $autoblockip . "\n" );
 540                 $ipblock->mAddress = $autoblockip;
 541                 $ipblock->mUser = 0;
 542                 $ipblock->mBy = $this->mBy;
 543                 $ipblock->mByName = $this->mByName;
 544                 $ipblock->mReason = wfMsgForContent( 'autoblocker', $this->mAddress, $this->mReason );
 545                 $ipblock->mTimestamp = wfTimestampNow();
 546                 $ipblock->mAuto = 1;
 547                 $ipblock->mCreateAccount = $this->mCreateAccount;
 548                 # Continue suppressing the name if needed
 549                 $ipblock->mHideName = $this->mHideName;
 550
 551                 # If the user is already blocked with an expiry date, we don't
 552                 # want to pile on top of that!
 553                 if($this->mExpiry) {
 554                         $ipblock->mExpiry = min ( $this->mExpiry, Block::getAutoblockExpiry( $this->mTimestamp ));
 555                 } else {
 556                         $ipblock->mExpiry = Block::getAutoblockExpiry( $this->mTimestamp );
 557                 }
 558                 # Insert it
 559                 return $ipblock->insert();
 560         }
 561
 562         function deleteIfExpired()
 563         {
 564                 $fname = 'Block::deleteIfExpired';
 565                 wfProfileIn( $fname );
 566                 if ( $this->isExpired() ) {
 567                         wfDebug( "Block::deleteIfExpired() -- deleting\n" );
 568                         $this->delete();
 569                         $retVal = true;
 570                 } else {
 571                         wfDebug( "Block::deleteIfExpired() -- not expired\n" );
 572                         $retVal = false;
 573                 }
 574                 wfProfileOut( $fname );
 575                 return $retVal;
 576         }
 577
 578         function isExpired()
 579         {
 580                 wfDebug( "Block::isExpired() checking current " . wfTimestampNow() . " vs $this->mExpiry\n" );
 581                 if ( !$this->mExpiry ) {
 582                         return false;
 583                 } else {
 584                         return wfTimestampNow() > $this->mExpiry;
 585                 }
 586         }
 587
 588         function isValid()
 589         {
 590                 return $this->mAddress != '';
 591         }
 592
 593         function updateTimestamp()
 594         {
 595                 if ( $this->mAuto ) {
 596                         $this->mTimestamp = wfTimestamp();
 597                         $this->mExpiry = Block::getAutoblockExpiry( $this->mTimestamp );
 598
 599                         $dbw = wfGetDB( DB_MASTER );
 600                         $dbw->update( 'ipblocks',
 601                                 array( /* SET */
 602                                         'ipb_timestamp' => $dbw->timestamp($this->mTimestamp),
 603                                         'ipb_expiry' => $dbw->timestamp($this->mExpiry),
 604                                 ), array( /* WHERE */
 605                                         'ipb_address' => $this->mAddress
 606                                 ), 'Block::updateTimestamp'
 607                         );
 608                 }
 609         }
 610
 611         /*
 612         function getIntegerAddr()
 613         {
 614                 return $this->mIntegerAddr;
 615         }
 616
 617         function getNetworkBits()
 618         {
 619                 return $this->mNetworkBits;
 620         }*/
 621
 622         /**
 623          * @return The blocker user ID.
 624          */
 625         public function getBy() {
 626                 return $this->mBy;
 627         }
 628
 629         /**
 630          * @return The blocker user name.
 631          */
 632         function getByName()
 633         {
 634                 return $this->mByName;
 635         }
 636
 637         function forUpdate( $x = NULL ) {
 638                 return wfSetVar( $this->mForUpdate, $x );
 639         }
 640
 641         function fromMaster( $x = NULL ) {
 642                 return wfSetVar( $this->mFromMaster, $x );
 643         }
 644
 645         function getRedactedName() {
 646                 if ( $this->mAuto ) {
 647                         return '#' . $this->mId;
 648                 } else {
 649                         return $this->mAddress;
 650                 }
 651         }
 652
 653         /**
 654          * Encode expiry for DB
 655          */
 656         static function encodeExpiry( $expiry, $db ) {
 657                 if ( $expiry == '' || $expiry == Block::infinity() ) {
 658                         return Block::infinity();
 659                 } else {
 660                         return $db->timestamp( $expiry );
 661                 }
 662         }
 663
 664         /**
 665          * Decode expiry which has come from the DB
 666          */
 667         static function decodeExpiry( $expiry, $timestampType = TS_MW ) {
 668                 if ( $expiry == '' || $expiry == Block::infinity() ) {
 669                         return Block::infinity();
 670                 } else {
 671                         return wfTimestamp( $timestampType, $expiry );
 672                 }
 673         }
 674
 675         static function getAutoblockExpiry( $timestamp )
 676         {
 677                 global $wgAutoblockExpiry;
 678                 return wfTimestamp( TS_MW, wfTimestamp( TS_UNIX, $timestamp ) + $wgAutoblockExpiry );
 679         }
 680
 681         /**
 682          * Gets rid of uneeded numbers in quad-dotted/octet IP strings
 683          * For example, 127.111.113.151/24 -> 127.111.113.0/24
 684          */
 685         static function normaliseRange( $range ) {
 686                 $parts = explode( '/', $range );
 687                 if ( count( $parts ) == 2 ) {
 688                         // IPv6
 689                         if ( IP::isIPv6($range) && $parts[1] >= 64 && $parts[1] <= 128 ) {
 690                                 $bits = $parts[1];
 691                                 $ipint = IP::toUnsigned6( $parts[0] );
 692                                 # Native 32 bit functions WONT work here!!!
 693                                 # Convert to a padded binary number
 694                                 $network = wfBaseConvert( $ipint, 10, 2, 128 );
 695                                 # Truncate the last (128-$bits) bits and replace them with zeros
 696                                 $network = str_pad( substr( $network, 0, $bits ), 128, 0, STR_PAD_RIGHT );
 697                                 # Convert back to an integer
 698                                 $network = wfBaseConvert( $network, 2, 10 );
 699                                 # Reform octet address
 700                                 $newip = IP::toOctet( $network );
 701                                 $range = "$newip/{$parts[1]}";
 702                         } // IPv4
 703                         else if ( IP::isIPv4($range) && $parts[1] >= 16 && $parts[1] <= 32 ) {
 704                                 $shift = 32 - $parts[1];
 705                                 $ipint = IP::toUnsigned( $parts[0] );
 706                                 $ipint = $ipint >> $shift << $shift;
 707                                 $newip = long2ip( $ipint );
 708                                 $range = "$newip/{$parts[1]}";
 709                         }
 710                 }
 711                 return $range;
 712         }
 713
 714         /**
 715          * Purge expired blocks from the ipblocks table
 716          */
 717         static function purgeExpired() {
 718                 $dbw = wfGetDB( DB_MASTER );
 719                 $dbw->delete( 'ipblocks', array( 'ipb_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ), __METHOD__ );
 720         }
 721
 722         static function infinity() {
 723                 # This is a special keyword for timestamps in PostgreSQL, and
 724                 # works with CHAR(14) as well because "i" sorts after all numbers.
 725                 return 'infinity';
 726
 727                 /*
 728                 static $infinity;
 729                 if ( !isset( $infinity ) ) {
 730                         $dbr = wfGetDB( DB_SLAVE );
 731                         $infinity = $dbr->bigTimestamp();
 732                 }
 733                 return $infinity;
 734                  */
 735         }
 736
 737         /**
 738          * Convert a DB-encoded expiry into a real string that humans can read.
 739          */
 740         static function formatExpiry( $encoded_expiry ) {
 741
 742                 static $msg = null;
 743
 744                 if( is_null( $msg ) ) {
 745                         $msg = array();
 746                         $keys = array( 'infiniteblock', 'expiringblock' );
 747                         foreach( $keys as $key ) {
 748                                 $msg[$key] = wfMsgHtml( $key );
 749                         }
 750                 }
 751
 752                 $expiry = Block::decodeExpiry( $encoded_expiry );
 753                 if ($expiry == 'infinity') {
 754                         $expirystr = $msg['infiniteblock'];
 755                 } else {
 756                         global $wgLang;
 757                         $expiretimestr = $wgLang->timeanddate( $expiry, true );
 758                         $expirystr = wfMsgReplaceArgs( $msg['expiringblock'], array($expiretimestr) );
 759                 }
 760
 761                 return $expirystr;
 762         }
 763
 764         /**
 765          * Convert a typed-in expiry time into something we can put into the database.
 766          */
 767         static function parseExpiryInput( $expiry_input ) {
 768                 if ( $expiry_input == 'infinite' || $expiry_input == 'indefinite' ) {
 769                         $expiry = 'infinity';
 770                 } else {
 771                         $expiry = strtotime( $expiry_input );
 772                         if ($expiry < 0 || $expiry === false) {
 773                                 return false;
 774                         }
 775                 }
 776
 777                 return $expiry;
 778         }
 779
 780 }