Add support for Number grouping(commafy) based on CLDR number grouping patterns like...
[lhc/web/wiklou.git] / includes / Block.php
index 6541284..71e128d 100644 (file)
@@ -1,60 +1,93 @@
 <?php
 /**
- * @file
  * Blocks and bans object
- */
-
-/**
- * The block class
- * All the functions in this class assume the object is either explicitly
- * loaded or filled. It is not load-on-demand. There are no accessors.
  *
- * Globals used: $wgAutoblockExpiry, $wgAntiLockFlags
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
  *
- * @todo This could be used everywhere, but it isn't.
- * FIXME: this whole class is a cesspit, needs a complete rewrite
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
  */
 class Block {
-       /* public*/ var $mAddress, $mUser, $mBy, $mReason, $mTimestamp, $mAuto, $mId, $mExpiry,
-                               $mRangeStart, $mRangeEnd, $mAnonOnly, $mEnableAutoblock, $mHideName,
-                               $mBlockEmail, $mByName, $mAngryAutoblock, $mAllowUsertalk;
-       /* private */ var $mNetworkBits, $mIntegerAddr, $mForUpdate, $mFromMaster;
+       /* public*/ var $mReason, $mTimestamp, $mAuto, $mExpiry, $mHideName;
+
+       protected
+               $mId,
+               $mFromMaster,
 
-       const EB_KEEP_EXPIRED = 1;
-       const EB_FOR_UPDATE = 2;
-       const EB_RANGE_ONLY = 4;
+               $mBlockEmail,
+               $mDisableUsertalk,
+               $mCreateAccount;
 
+       /// @var User|String
+       protected $target;
+
+       /// @var Block::TYPE_ constant.  Can only be USER, IP or RANGE internally
+       protected $type;
+
+       /// @var User
+       protected $blocker;
+
+       /// @var Bool
+       protected $isHardblock = true;
+
+       /// @var Bool
+       protected $isAutoblocking = true;
+
+       # TYPE constants
        const TYPE_USER = 1;
        const TYPE_IP = 2;
        const TYPE_RANGE = 3;
        const TYPE_AUTO = 4;
        const TYPE_ID = 5;
 
+       /**
+        * Constructor
+        * @todo FIXME: Don't know what the best format to have for this constructor is, but fourteen
+        * optional parameters certainly isn't it.
+        */
        function __construct( $address = '', $user = 0, $by = 0, $reason = '',
                $timestamp = 0, $auto = 0, $expiry = '', $anonOnly = 0, $createAccount = 0, $enableAutoblock = 0,
-               $hideName = 0, $blockEmail = 0, $allowUsertalk = 0, $byName = false )
+               $hideName = 0, $blockEmail = 0, $allowUsertalk = 0 )
        {
-               $this->mId = 0;
-               # Expand valid IPv6 addresses
-               $address = IP::sanitizeIP( $address );
-               $this->mAddress = $address;
-               $this->mUser = $user;
-               $this->mBy = $by;
+               if( $timestamp === 0 ){
+                       $timestamp = wfTimestampNow();
+               }
+
+               if( count( func_get_args() ) > 0 ){
+                       # Soon... :D
+                       # wfDeprecated( __METHOD__ . " with arguments" );
+               }
+
+               $this->setTarget( $address );
+               $this->setBlocker( User::newFromID( $by ) );
                $this->mReason = $reason;
                $this->mTimestamp = wfTimestamp( TS_MW, $timestamp );
                $this->mAuto = $auto;
-               $this->mAnonOnly = $anonOnly;
-               $this->mCreateAccount = $createAccount;
-               $this->mExpiry = self::decodeExpiry( $expiry );
-               $this->mEnableAutoblock = $enableAutoblock;
+               $this->isHardblock( !$anonOnly );
+               $this->prevents( 'createaccount', $createAccount );
+               if ( $expiry == 'infinity' || $expiry == Block::infinity() ) {
+                       $this->mExpiry = 'infinity';
+               } else {
+                       $this->mExpiry = wfTimestamp( TS_MW, $expiry );
+               }
+               $this->isAutoblocking( $enableAutoblock );
                $this->mHideName = $hideName;
-               $this->mBlockEmail = $blockEmail;
-               $this->mAllowUsertalk = $allowUsertalk;
-               $this->mForUpdate = false;
+               $this->prevents( 'sendemail', $blockEmail );
+               $this->prevents( 'editownusertalk', !$allowUsertalk );
+
                $this->mFromMaster = false;
-               $this->mByName = $byName;
-               $this->mAngryAutoblock = false;
-               $this->initialiseRange();
        }
 
        /**
@@ -64,55 +97,54 @@ class Block {
         *
         * @param $address String: IP address of user/anon
         * @param $user Integer: user id of user
-        * @param $killExpired Boolean: delete expired blocks on load
         * @return Block Object
+        * @deprecated since 1.18
         */
-       public static function newFromDB( $address, $user = 0, $killExpired = true ) {
-               $block = new Block;
-               $block->load( $address, $user, $killExpired );
-               if ( $block->isValid() ) {
-                       return $block;
-               } else {
-                       return null;
-               }
+       public static function newFromDB( $address, $user = 0 ) {
+               return self::newFromTarget( User::whoIs( $user ), $address );
        }
 
        /**
         * Load a blocked user from their block id.
         *
         * @param $id Integer: Block id to search for
-        * @return Block object
+        * @return Block object or null
         */
        public static function newFromID( $id ) {
                $dbr = wfGetDB( DB_SLAVE );
-               $res = $dbr->resultObject( $dbr->select( 'ipblocks', '*',
-                       array( 'ipb_id' => $id ), __METHOD__ ) );
-               $block = new Block;
-
-               if ( $block->loadFromResult( $res ) ) {
-                       return $block;
+               $res = $dbr->selectRow(
+                       'ipblocks',
+                       '*',
+                       array( 'ipb_id' => $id ),
+                       __METHOD__
+               );
+               if ( $res ) {
+                       return Block::newFromRow( $res );
                } else {
                        return null;
                }
        }
 
        /**
-        * Check if two blocks are effectively equal
+        * Check if two blocks are effectively equal.  Doesn't check irrelevant things like
+        * the blocking user or the block timestamp, only things which affect the blocked user   *
         *
-        * @return Boolean
+        * @param $block Block
+        *
+        * @return bool
         */
        public function equals( Block $block ) {
                return (
-                       $this->mAddress == $block->mAddress
-                       && $this->mUser == $block->mUser
+                       (string)$this->target == (string)$block->target
+                       && $this->type == $block->type
                        && $this->mAuto == $block->mAuto
-                       && $this->mAnonOnly == $block->mAnonOnly
-                       && $this->mCreateAccount == $block->mCreateAccount
+                       && $this->isHardblock() == $block->isHardblock()
+                       && $this->prevents( 'createaccount' ) == $block->prevents( 'createaccount' )
                        && $this->mExpiry == $block->mExpiry
-                       && $this->mEnableAutoblock == $block->mEnableAutoblock
+                       && $this->isAutoblocking() == $block->isAutoblocking()
                        && $this->mHideName == $block->mHideName
-                       && $this->mBlockEmail == $block->mBlockEmail
-                       && $this->mAllowUsertalk == $block->mAllowUsertalk
+                       && $this->prevents( 'sendemail' ) == $block->prevents( 'sendemail' )
+                       && $this->prevents( 'editownusertalk' ) == $block->prevents( 'editownusertalk' )
                        && $this->mReason == $block->mReason
                );
        }
@@ -120,251 +152,232 @@ class Block {
        /**
         * Clear all member variables in the current object. Does not clear
         * the block from the DB.
+        * @deprecated since 1.18
         */
        public function clear() {
-               $this->mAddress = $this->mReason = $this->mTimestamp = '';
-               $this->mId = $this->mAnonOnly = $this->mCreateAccount =
-                       $this->mEnableAutoblock = $this->mAuto = $this->mUser =
-                       $this->mBy = $this->mHideName = $this->mBlockEmail = $this->mAllowUsertalk = 0;
-               $this->mByName = false;
+               # Noop
        }
 
        /**
-        * Get the DB object and set the reference parameter to the select options.
-        * The options array will contain FOR UPDATE if appropriate.
+        * Get a block from the DB, with either the given address or the given username
         *
-        * @param $options Array
-        * @return Database
+        * @param $address string The IP address of the user, or blank to skip IP blocks
+        * @param $user int The user ID, or zero for anonymous users
+        * @return Boolean: the user is blocked from editing
+        * @deprecated since 1.18
         */
-       protected function &getDBOptions( &$options ) {
-               global $wgAntiLockFlags;
+       public function load( $address = '', $user = 0 ) {
+               wfDeprecated( __METHOD__ );
+               if( $user ){
+                       $username = User::whoIs( $user );
+                       $block = self::newFromTarget( $username, $address );
+               } else {
+                       $block = self::newFromTarget( null, $address );
+               }
 
-               if ( $this->mForUpdate || $this->mFromMaster ) {
-                       $db = wfGetDB( DB_MASTER );
-                       if ( !$this->mForUpdate || ( $wgAntiLockFlags & ALF_NO_BLOCK_LOCK ) ) {
-                               $options = array();
-                       } else {
-                               $options = array( 'FOR UPDATE' );
+               if( $block instanceof Block ){
+                       # This is mildly evil, but hey, it's B/C :D
+                       foreach( $block as $variable => $value ){
+                               $this->$variable = $value;
                        }
+                       return true;
                } else {
-                       $db = wfGetDB( DB_SLAVE );
-                       $options = array();
+                       return false;
                }
-
-               return $db;
        }
 
        /**
-        * Get a block from the DB, with either the given address or the given username
-        *
-        * @param $address string The IP address of the user, or blank to skip IP blocks
-        * @param $user int The user ID, or zero for anonymous users
-        * @param $killExpired bool Whether to delete expired rows while loading
-        * @return Boolean: the user is blocked from editing
-        *
+        * Load a block from the database which affects the already-set $this->target:
+        *     1) A block directly on the given user or IP
+        *     2) A rangeblock encompasing the given IP (smallest first)
+        *     3) An autoblock on the given IP
+        * @param $vagueTarget User|String also search for blocks affecting this target.  Doesn't
+        *     make any sense to use TYPE_AUTO / TYPE_ID here. Leave blank to skip IP lookups.
+        * @return Bool whether a relevant block was found
         */
-       public function load( $address = '', $user = 0, $killExpired = true ) {
-               wfDebug( "Block::load: '$address', '$user', $killExpired\n" );
-
-               $options = array();
-               $db = $this->getDBOptions( $options );
+       protected function newLoad( $vagueTarget = null ) {
+               $db = wfGetDB( $this->mFromMaster ? DB_MASTER : DB_SLAVE );
 
-               if ( 0 == $user && $address === '' ) {
-                       # Invalid user specification, not blocked
-                       $this->clear();
-
-                       return false;
+               if( $this->type !== null ){
+                       $conds = array(
+                               'ipb_address' => array( (string)$this->target ),
+                       );
+               } else {
+                       $conds = array( 'ipb_address' => array() );
                }
 
-               # Try user block
-               if ( $user ) {
-                       $res = $db->resultObject( $db->select( 'ipblocks', '*', array( 'ipb_user' => $user ),
-                               __METHOD__, $options ) );
-
-                       if ( $this->loadFromResult( $res, $killExpired ) ) {
-                               return true;
+               # Be aware that the != '' check is explicit, since empty values will be
+               # passed by some callers (bug 29116)
+               if( $vagueTarget != ''){
+                       list( $target, $type ) = self::parseTarget( $vagueTarget );
+                       switch( $type ) {
+                               case self::TYPE_USER:
+                                       # Slightly wierd, but who are we to argue?
+                                       $conds['ipb_address'][] = (string)$target;
+                                       break;
+
+                               case self::TYPE_IP:
+                                       $conds['ipb_address'][] = (string)$target;
+                                       $conds[] = self::getRangeCond( IP::toHex( $target ) );
+                                       $conds = $db->makeList( $conds, LIST_OR );
+                                       break;
+
+                               case self::TYPE_RANGE:
+                                       list( $start, $end ) = IP::parseRange( $target );
+                                       $conds['ipb_address'][] = (string)$target;
+                                       $conds[] = self::getRangeCond( $start, $end );
+                                       $conds = $db->makeList( $conds, LIST_OR );
+                                       break;
+
+                               default:
+                                       throw new MWException( "Tried to load block with invalid type" );
                        }
                }
 
-               # Try IP block
-               # TODO: improve performance by merging this query with the autoblock one
-               # Slightly tricky while handling killExpired as well
-               if ( $address !== '' ) {
-                       $conds = array( 'ipb_address' => $address, 'ipb_auto' => 0 );
-                       $res = $db->resultObject( $db->select( 'ipblocks', '*', $conds, __METHOD__, $options ) );
-
-                       if ( $this->loadFromResult( $res, $killExpired ) ) {
-                               if ( $user && $this->mAnonOnly ) {
-                                       # Block is marked anon-only
-                                       # Whitelist this IP address against autoblocks and range blocks
-                                       # (but not account creation blocks -- bug 13611)
-                                       if ( !$this->mCreateAccount ) {
-                                               $this->clear();
-                                       }
-
-                                       return false;
-                               } else {
-                                       return true;
-                               }
-                       }
-               }
+               $res = $db->select( 'ipblocks', '*', $conds, __METHOD__ );
 
-               # Try range block
-               if ( $this->loadRange( $address, $killExpired, $user ) ) {
-                       if ( $user && $this->mAnonOnly ) {
-                               # Respect account creation blocks on logged-in users -- bug 13611
-                               if ( !$this->mCreateAccount ) {
-                                       $this->clear();
-                               }
+               # This result could contain a block on the user, a block on the IP, and a russian-doll
+               # set of rangeblocks.  We want to choose the most specific one, so keep a leader board.
+               $bestRow = null;
 
-                               return false;
-                       } else {
-                               return true;
-                       }
-               }
+               # Lower will be better
+               $bestBlockScore = 100;
 
-               # Try autoblock
-               if ( $address ) {
-                       $conds = array( 'ipb_address' => $address, 'ipb_auto' => 1 );
+               # This is begging for $this = $bestBlock, but that's not allowed in PHP :(
+               $bestBlockPreventsEdit = null;
 
-                       if ( $user ) {
-                               $conds['ipb_anon_only'] = 0;
-                       }
+               foreach( $res as $row ){
+                       $block = Block::newFromRow( $row );
 
-                       $res = $db->resultObject( $db->select( 'ipblocks', '*', $conds, __METHOD__, $options ) );
+                       # Don't use expired blocks
+                       if( $block->deleteIfExpired() ){
+                               continue;
+                       }
 
-                       if ( $this->loadFromResult( $res, $killExpired ) ) {
-                               return true;
+                       # Don't use anon only blocks on users
+                       if( $this->type == self::TYPE_USER && !$block->isHardblock() ){
+                               continue;
                        }
-               }
 
-               # Give up
-               $this->clear();
-               return false;
-       }
+                       if( $block->getType() == self::TYPE_RANGE ){
+                               # This is the number of bits that are allowed to vary in the block, give
+                               # or take some floating point errors
+                               $end = wfBaseconvert( $block->getRangeEnd(), 16, 10 );
+                               $start = wfBaseconvert( $block->getRangeStart(), 16, 10 );
+                               $size = log( $end - $start + 1, 2 );
+
+                               # This has the nice property that a /32 block is ranked equally with a
+                               # single-IP block, which is exactly what it is...
+                               $score = self::TYPE_RANGE  - 1 + ( $size / 128 );
 
-       /**
-        * Fill in member variables from a result wrapper
-        *
-        * @param $res ResultWrapper: row from the ipblocks table
-        * @param $killExpired Boolean: whether to delete expired rows while loading
-        * @return Boolean
-        */
-       protected function loadFromResult( ResultWrapper $res, $killExpired = true ) {
-               $ret = false;
-
-               if ( 0 != $res->numRows() ) {
-                       # Get first block
-                       $row = $res->fetchObject();
-                       $this->initFromRow( $row );
-
-                       if ( $killExpired ) {
-                               # If requested, delete expired rows
-                               do {
-                                       $killed = $this->deleteIfExpired();
-                                       if ( $killed ) {
-                                               $row = $res->fetchObject();
-                                               if ( $row ) {
-                                                       $this->initFromRow( $row );
-                                               }
-                                       }
-                               } while ( $killed && $row );
-
-                               # If there were any left after the killing finished, return true
-                               if ( $row ) {
-                                       $ret = true;
-                               }
                        } else {
-                               $ret = true;
+                               $score = $block->getType();
+                       }
+
+                       if( $score < $bestBlockScore ){
+                               $bestBlockScore = $score;
+                               $bestRow = $row;
+                               $bestBlockPreventsEdit = $block->prevents( 'edit' );
                        }
                }
-               $res->free();
 
-               return $ret;
+               if( $bestRow !== null ){
+                       $this->initFromRow( $bestRow );
+                       $this->prevents( 'edit', $bestBlockPreventsEdit );
+                       return true;
+               } else {
+                       return false;
+               }
        }
 
        /**
-        * Search the database for any range blocks matching the given address, and
-        * load the row if one is found.
-        *
-        * @param $address String: IP address range
-        * @param $killExpired Boolean: whether to delete expired rows while loading
-        * @param $user Integer: if not 0, then sets ipb_anon_only
-        * @return Boolean
+        * Get a set of SQL conditions which will select rangeblocks encompasing a given range
+        * @param $start String Hexadecimal IP representation
+        * @param $end String Hexadecimal IP represenation, or null to use $start = $end
+        * @return String
         */
-       public function loadRange( $address, $killExpired = true, $user = 0 ) {
-               $iaddr = IP::toHex( $address );
-
-               if ( $iaddr === false ) {
-                       # Invalid address
-                       return false;
+       public static function getRangeCond( $start, $end = null ) {
+               if ( $end === null ) {
+                       $end = $start;
                }
+               # Per bug 14634, we want to include relevant active rangeblocks; for
+               # rangeblocks, we want to include larger ranges which enclose the given
+               # range. We know that all blocks must be smaller than $wgBlockCIDRLimit,
+               # so we can improve performance by filtering on a LIKE clause
+               $chunk = self::getIpFragment( $start );
+               $dbr = wfGetDB( DB_SLAVE );
+               $like = $dbr->buildLike( $chunk, $dbr->anyString() );
 
-               # Only scan ranges which start in this /16, this improves search speed
-               # Blocks should not cross a /16 boundary.
-               $range = substr( $iaddr, 0, 4 );
+               # Fairly hard to make a malicious SQL statement out of hex characters,
+               # but stranger things have happened...
+               $safeStart = $dbr->addQuotes( $start );
+               $safeEnd = $dbr->addQuotes( $end );
 
-               $options = array();
-               $db = $this->getDBOptions( $options );
-               $conds = array(
-                       'ipb_range_start' . $db->buildLike( $range, $db->anyString() ),
-                       "ipb_range_start <= '$iaddr'",
-                       "ipb_range_end >= '$iaddr'"
+               return $dbr->makeList(
+                       array(
+                               "ipb_range_start $like",
+                               "ipb_range_start <= $safeStart",
+                               "ipb_range_end >= $safeEnd",
+                       ),
+                       LIST_AND
                );
+       }
 
-               if ( $user ) {
-                       $conds['ipb_anon_only'] = 0;
+       /**
+        * Get the component of an IP address which is certain to be the same between an IP
+        * address and a rangeblock containing that IP address.
+        * @param  $hex String Hexadecimal IP representation
+        * @return String
+        */
+       protected static function getIpFragment( $hex ) {
+               global $wgBlockCIDRLimit;
+               if ( substr( $hex, 0, 3 ) == 'v6-' ) {
+                       return 'v6-' . substr( substr( $hex, 3 ), 0,  floor( $wgBlockCIDRLimit['IPv6'] / 4 ) );
+               } else {
+                       return substr( $hex, 0,  floor( $wgBlockCIDRLimit['IPv4'] / 4 ) );
                }
-
-               $res = $db->resultObject( $db->select( 'ipblocks', '*', $conds, __METHOD__, $options ) );
-               $success = $this->loadFromResult( $res, $killExpired );
-
-               return $success;
        }
 
        /**
         * Given a database row from the ipblocks table, initialize
         * member variables
-        *
         * @param $row ResultWrapper: a row from the ipblocks table
         */
-       public function initFromRow( $row ) {
-               $this->mAddress = $row->ipb_address;
+       protected function initFromRow( $row ) {
+               $this->setTarget( $row->ipb_address );
+               $this->setBlocker( User::newFromId( $row->ipb_by ) );
+
                $this->mReason = $row->ipb_reason;
                $this->mTimestamp = wfTimestamp( TS_MW, $row->ipb_timestamp );
-               $this->mUser = $row->ipb_user;
-               $this->mBy = $row->ipb_by;
                $this->mAuto = $row->ipb_auto;
-               $this->mAnonOnly = $row->ipb_anon_only;
-               $this->mCreateAccount = $row->ipb_create_account;
-               $this->mEnableAutoblock = $row->ipb_enable_autoblock;
-               $this->mBlockEmail = $row->ipb_block_email;
-               $this->mAllowUsertalk = $row->ipb_allow_usertalk;
                $this->mHideName = $row->ipb_deleted;
                $this->mId = $row->ipb_id;
-               $this->mExpiry = self::decodeExpiry( $row->ipb_expiry );
 
-               if ( isset( $row->user_name ) ) {
-                       $this->mByName = $row->user_name;
+               // I wish I didn't have to do this
+               $db = wfGetDB( DB_SLAVE );
+               if ( $row->ipb_expiry == $db->getInfinity() ) {
+                       $this->mExpiry = 'infinity';
                } else {
-                       $this->mByName = $row->ipb_by_text;
+                       $this->mExpiry = wfTimestamp( TS_MW, $row->ipb_expiry );
                }
 
-               $this->mRangeStart = $row->ipb_range_start;
-               $this->mRangeEnd = $row->ipb_range_end;
+               $this->isHardblock( !$row->ipb_anon_only );
+               $this->isAutoblocking( $row->ipb_enable_autoblock );
+
+               $this->prevents( 'createaccount', $row->ipb_create_account );
+               $this->prevents( 'sendemail', $row->ipb_block_email );
+               $this->prevents( 'editownusertalk', !$row->ipb_allow_usertalk );
        }
 
        /**
-        * Once $mAddress has been set, get the range they came from.
-        * Wrapper for IP::parseRange
+        * Create a new Block object from a database row
+        * @param  $row ResultWrapper row from the ipblocks table
+        * @return Block
         */
-       protected function initialiseRange() {
-               $this->mRangeStart = '';
-               $this->mRangeEnd = '';
-
-               if ( $this->mUser == 0 ) {
-                       list( $this->mRangeStart, $this->mRangeEnd ) = IP::parseRange( $this->mAddress );
-               }
+       public static function newFromRow( $row ){
+               $block = new Block;
+               $block->initFromRow( $row );
+               return $block;
        }
 
        /**
@@ -377,12 +390,12 @@ class Block {
                        return false;
                }
 
-               if ( !$this->mId ) {
-                       throw new MWException( "Block::delete() now requires that the mId member be filled\n" );
+               if ( !$this->getId() ) {
+                       throw new MWException( "Block::delete() requires that the mId member be filled\n" );
                }
 
                $dbw = wfGetDB( DB_MASTER );
-               $dbw->delete( 'ipblocks', array( 'ipb_id' => $this->mId ), __METHOD__ );
+               $dbw->delete( 'ipblocks', array( 'ipb_id' => $this->getId() ), __METHOD__ );
 
                return $dbw->affectedRows() > 0;
        }
@@ -391,16 +404,16 @@ class Block {
         * Insert a block into the block table. Will fail if there is a conflicting
         * block (same name and options) already in the database.
         *
-        * @return Boolean: whether or not the insertion was successful.
+        * @param $dbw DatabaseBase if you have one available
+        * @return mixed: false on failure, assoc array on success:
+        *      ('id' => block ID, 'autoIds' => array of autoblock IDs)
         */
        public function insert( $dbw = null ) {
                wfDebug( "Block::insert; timestamp {$this->mTimestamp}\n" );
 
-               if ( $dbw === null )
+               if ( $dbw === null ) {
                        $dbw = wfGetDB( DB_MASTER );
-
-               $this->validateBlockParams();
-               $this->initialiseRange();
+               }
 
                # Don't collide with expired blocks
                Block::purgeExpired();
@@ -408,139 +421,125 @@ class Block {
                $ipb_id = $dbw->nextSequenceValue( 'ipblocks_ipb_id_seq' );
                $dbw->insert(
                        'ipblocks',
-                       array(
-                               'ipb_id' => $ipb_id,
-                               'ipb_address' => $this->mAddress,
-                               'ipb_user' => $this->mUser,
-                               'ipb_by' => $this->mBy,
-                               'ipb_by_text' => $this->mByName,
-                               'ipb_reason' => $this->mReason,
-                               'ipb_timestamp' => $dbw->timestamp( $this->mTimestamp ),
-                               'ipb_auto' => $this->mAuto,
-                               'ipb_anon_only' => $this->mAnonOnly,
-                               'ipb_create_account' => $this->mCreateAccount,
-                               'ipb_enable_autoblock' => $this->mEnableAutoblock,
-                               'ipb_expiry' => self::encodeExpiry( $this->mExpiry, $dbw ),
-                               'ipb_range_start' => $this->mRangeStart,
-                               'ipb_range_end' => $this->mRangeEnd,
-                               'ipb_deleted'   => intval( $this->mHideName ), // typecast required for SQLite
-                               'ipb_block_email' => $this->mBlockEmail,
-                               'ipb_allow_usertalk' => $this->mAllowUsertalk
-                       ),
-                       'Block::insert',
+                       $this->getDatabaseArray(),
+                       __METHOD__,
                        array( 'IGNORE' )
                );
                $affected = $dbw->affectedRows();
+               $this->mId = $dbw->insertId();
 
-               if ( $affected )
-                       $this->doRetroactiveAutoblock();
+               if ( $affected ) {
+                       $auto_ipd_ids = $this->doRetroactiveAutoblock();
+                       return array( 'id' => $this->mId, 'autoIds' => $auto_ipd_ids );
+               }
 
-               return (bool)$affected;
+               return false;
        }
 
        /**
         * Update a block in the DB with new parameters.
         * The ID field needs to be loaded first.
+        *
+        * @return Int number of affected rows, which should probably be 1 or something's
+        *     gone slightly awry
         */
        public function update() {
                wfDebug( "Block::update; timestamp {$this->mTimestamp}\n" );
                $dbw = wfGetDB( DB_MASTER );
 
-               $this->validateBlockParams();
-
                $dbw->update(
                        'ipblocks',
-                       array(
-                               'ipb_user' => $this->mUser,
-                               'ipb_by' => $this->mBy,
-                               'ipb_by_text' => $this->mByName,
-                               'ipb_reason' => $this->mReason,
-                               'ipb_timestamp' => $dbw->timestamp( $this->mTimestamp ),
-                               'ipb_auto' => $this->mAuto,
-                               'ipb_anon_only' => $this->mAnonOnly,
-                               'ipb_create_account' => $this->mCreateAccount,
-                               'ipb_enable_autoblock' => $this->mEnableAutoblock,
-                               'ipb_expiry' => self::encodeExpiry( $this->mExpiry, $dbw ),
-                               'ipb_range_start' => $this->mRangeStart,
-                               'ipb_range_end' => $this->mRangeEnd,
-                               'ipb_deleted'   => $this->mHideName,
-                               'ipb_block_email' => $this->mBlockEmail,
-                               'ipb_allow_usertalk' => $this->mAllowUsertalk
-                       ),
-                       array( 'ipb_id' => $this->mId ),
-                       'Block::update'
+                       $this->getDatabaseArray( $dbw ),
+                       array( 'ipb_id' => $this->getId() ),
+                       __METHOD__
                );
 
                return $dbw->affectedRows();
        }
 
        /**
-        * Make sure all the proper members are set to sane values
-        * before adding/updating a block
+        * Get an array suitable for passing to $dbw->insert() or $dbw->update()
+        * @param $db DatabaseBase
+        * @return Array
         */
-       protected function validateBlockParams() {
-               # Unset ipb_anon_only for user blocks, makes no sense
-               if ( $this->mUser ) {
-                       $this->mAnonOnly = 0;
+       protected function getDatabaseArray( $db = null ){
+               if( !$db ){
+                       $db = wfGetDB( DB_SLAVE );
                }
+               $expiry = $db->encodeExpiry( $this->mExpiry );
+
+               $a = array(
+                       'ipb_address'          => (string)$this->target,
+                       'ipb_user'             => $this->target instanceof User ? $this->target->getID() : 0,
+                       'ipb_by'               => $this->getBlocker()->getId(),
+                       'ipb_by_text'          => $this->getBlocker()->getName(),
+                       'ipb_reason'           => $this->mReason,
+                       'ipb_timestamp'        => $db->timestamp( $this->mTimestamp ),
+                       'ipb_auto'             => $this->mAuto,
+                       'ipb_anon_only'        => !$this->isHardblock(),
+                       'ipb_create_account'   => $this->prevents( 'createaccount' ),
+                       'ipb_enable_autoblock' => $this->isAutoblocking(),
+                       'ipb_expiry'           => $expiry,
+                       'ipb_range_start'      => $this->getRangeStart(),
+                       'ipb_range_end'        => $this->getRangeEnd(),
+                       'ipb_deleted'          => intval( $this->mHideName ), // typecast required for SQLite
+                       'ipb_block_email'      => $this->prevents( 'sendemail' ),
+                       'ipb_allow_usertalk'   => !$this->prevents( 'editownusertalk' )
+               );
 
-               # Unset ipb_enable_autoblock for IP blocks, makes no sense
-               if ( !$this->mUser ) {
-                       $this->mEnableAutoblock = 0;
-               }
+               return $a;
+       }
 
-               # bug 18860: non-anon-only IP blocks should be allowed to block email
-               if ( !$this->mUser && $this->mAnonOnly ) {
-                       $this->mBlockEmail = 0;
-               }
+       /**
+        * Retroactively autoblocks the last IP used by the user (if it is a user)
+        * blocked by this Block.
+        *
+        * @return Array: block IDs of retroactive autoblocks made
+        */
+       protected function doRetroactiveAutoblock() {
+               $blockIds = array();
+               # If autoblock is enabled, autoblock the LAST IP(s) used
+               if ( $this->isAutoblocking() && $this->getType() == self::TYPE_USER ) {
+                       wfDebug( "Doing retroactive autoblocks for " . $this->getTarget() . "\n" );
 
-               if ( !$this->mByName ) {
-                       if ( $this->mBy ) {
-                               $this->mByName = User::whoIs( $this->mBy );
-                       } else {
-                               global $wgUser;
-                               $this->mByName = $wgUser->getName();
+                       $continue = wfRunHooks(
+                               'PerformRetroactiveAutoblock', array( $this, &$blockIds ) );
+
+                       if ( $continue ) {
+                               self::defaultRetroactiveAutoblock( $this, $blockIds );
                        }
                }
+               return $blockIds;
        }
 
        /**
         * Retroactively autoblocks the last IP used by the user (if it is a user)
-        * blocked by this Block.
+        * blocked by this Block. This will use the recentchanges table.
         *
-        * @return Boolean: whether or not a retroactive autoblock was made.
+        * @param Block $block
+        * @param Array &$blockIds
+        * @return Array: block IDs of retroactive autoblocks made
         */
-       public function doRetroactiveAutoblock() {
+       protected static function defaultRetroactiveAutoblock( Block $block, array &$blockIds ) {
                $dbr = wfGetDB( DB_SLAVE );
-               # If autoblock is enabled, autoblock the LAST IP used
-               # - stolen shamelessly from CheckUser_body.php
 
-               if ( $this->mEnableAutoblock && $this->mUser ) {
-                       wfDebug( "Doing retroactive autoblocks for " . $this->mAddress . "\n" );
+               $options = array( 'ORDER BY' => 'rc_timestamp DESC' );
+               $conds = array( 'rc_user_text' => (string)$block->getTarget() );
 
-                       $options = array( 'ORDER BY' => 'rc_timestamp DESC' );
-                       $conds = array( 'rc_user_text' => $this->mAddress );
+               // Just the last IP used.
+               $options['LIMIT'] = 1;
 
-                       if ( $this->mAngryAutoblock ) {
-                               // Block any IP used in the last 7 days. Up to five IPs.
-                               $conds[] = 'rc_timestamp < ' . $dbr->addQuotes( $dbr->timestamp( time() - ( 7 * 86400 ) ) );
-                               $options['LIMIT'] = 5;
-                       } else {
-                               // Just the last IP used.
-                               $options['LIMIT'] = 1;
-                       }
-
-                       $res = $dbr->select( 'recentchanges', array( 'rc_ip' ), $conds,
-                               __METHOD__ ,  $options );
+               $res = $dbr->select( 'recentchanges', array( 'rc_ip' ), $conds,
+                       __METHOD__ ,  $options );
 
-                       if ( !$dbr->numRows( $res ) ) {
-                               # No results, don't autoblock anything
-                               wfDebug( "No IP found to retroactively autoblock\n" );
-                       } else {
-                               foreach ( $res as $row ) {
-                                       if ( $row->rc_ip ) {
-                                               $this->doAutoblock( $row->rc_ip );
-                                       }
+               if ( !$dbr->numRows( $res ) ) {
+                       # No results, don't autoblock anything
+                       wfDebug( "No IP found to retroactively autoblock\n" );
+               } else {
+                       foreach ( $res as $row ) {
+                               if ( $row->rc_ip ) {
+                                       $id = $block->doAutoblock( $row->rc_ip );
+                                       if ( $id ) $blockIds[] = $id;
                                }
                        }
                }
@@ -548,6 +547,7 @@ class Block {
 
        /**
         * Checks whether a given IP is on the autoblock whitelist.
+        * TODO: this probably belongs somewhere else, but not sure where...
         *
         * @param $ip String: The IP to check
         * @return Boolean
@@ -593,73 +593,70 @@ class Block {
         * Autoblocks the given IP, referring to this Block.
         *
         * @param $autoblockIP String: the IP to autoblock.
-        * @param $justInserted Boolean: the main block was just inserted
-        * @return Boolean: whether or not an autoblock was inserted.
+        * @return mixed: block ID if an autoblock was inserted, false if not.
         */
-       public function doAutoblock( $autoblockIP, $justInserted = false ) {
+       public function doAutoblock( $autoblockIP ) {
                # If autoblocks are disabled, go away.
-               if ( !$this->mEnableAutoblock ) {
-                       return;
+               if ( !$this->isAutoblocking() ) {
+                       return false;
                }
 
-               # Check for presence on the autoblock whitelist
-               if ( Block::isWhitelistedFromAutoblocks( $autoblockIP ) ) {
-                       return;
+               # Check for presence on the autoblock whitelist.
+               if ( self::isWhitelistedFromAutoblocks( $autoblockIP ) ) {
+                       return false;
                }
 
-               # Allow hooks to cancel the autoblock.
+               # Allow hooks to cancel the autoblock.
                if ( !wfRunHooks( 'AbortAutoblock', array( $autoblockIP, &$this ) ) ) {
                        wfDebug( "Autoblock aborted by hook.\n" );
                        return false;
                }
 
-               # It's okay to autoblock. Go ahead and create/insert the block.
+               # It's okay to autoblock. Go ahead and insert/update the block...
 
-               $ipblock = Block::newFromDB( $autoblockIP );
+               # Do not add a *new* block if the IP is already blocked.
+               $ipblock = Block::newFromTarget( $autoblockIP );
                if ( $ipblock ) {
-                       # If the user is already blocked. Then check if the autoblock would
-                       # exceed the user block. If it would exceed, then do nothing, else
-                       # prolong block time
-                       if ( $this->mExpiry &&
-                               ( $this->mExpiry < Block::getAutoblockExpiry( $ipblock->mTimestamp ) )
+                       # Check if the block is an autoblock and would exceed the user block
+                       # if renewed. If so, do nothing, otherwise prolong the block time...
+                       if ( $ipblock->mAuto && // @TODO: why not compare $ipblock->mExpiry?
+                               $this->mExpiry > Block::getAutoblockExpiry( $ipblock->mTimestamp )
                        ) {
-                               return;
-                       }
-
-                       # Just update the timestamp
-                       if ( !$justInserted ) {
+                               # Reset block timestamp to now and its expiry to
+                               # $wgAutoblockExpiry in the future
                                $ipblock->updateTimestamp();
                        }
+                       return false;
+               }
 
-                       return;
-               } else {
-                       $ipblock = new Block;
-               }
-
-               # Make a new block object with the desired properties
-               wfDebug( "Autoblocking {$this->mAddress}@" . $autoblockIP . "\n" );
-               $ipblock->mAddress = $autoblockIP;
-               $ipblock->mUser = 0;
-               $ipblock->mBy = $this->mBy;
-               $ipblock->mByName = $this->mByName;
-               $ipblock->mReason = wfMsgForContent( 'autoblocker', $this->mAddress, $this->mReason );
-               $ipblock->mTimestamp = wfTimestampNow();
-               $ipblock->mAuto = 1;
-               $ipblock->mCreateAccount = $this->mCreateAccount;
+               # Make a new block object with the desired properties.
+               $autoblock = new Block;
+               wfDebug( "Autoblocking {$this->getTarget()}@" . $autoblockIP . "\n" );
+               $autoblock->setTarget( $autoblockIP );
+               $autoblock->setBlocker( $this->getBlocker() );
+               $autoblock->mReason = wfMsgForContent( 'autoblocker', $this->getTarget(), $this->mReason );
+               $timestamp = wfTimestampNow();
+               $autoblock->mTimestamp = $timestamp;
+               $autoblock->mAuto = 1;
+               $autoblock->prevents( 'createaccount', $this->prevents( 'createaccount' ) );
                # Continue suppressing the name if needed
-               $ipblock->mHideName = $this->mHideName;
-               $ipblock->mAllowUsertalk = $this->mAllowUsertalk;
+               $autoblock->mHideName = $this->mHideName;
+               $autoblock->prevents( 'editownusertalk', $this->prevents( 'editownusertalk' ) );
 
-               # If the user is already blocked with an expiry date, we don't
-               # want to pile on top of that!
-               if ( $this->mExpiry ) {
-                       $ipblock->mExpiry = min( $this->mExpiry, Block::getAutoblockExpiry( $this->mTimestamp ) );
+               if ( $this->mExpiry == 'infinity' ) {
+                       # Original block was indefinite, start an autoblock now
+                       $autoblock->mExpiry = Block::getAutoblockExpiry( $timestamp );
                } else {
-                       $ipblock->mExpiry = Block::getAutoblockExpiry( $this->mTimestamp );
+                       # If the user is already blocked with an expiry date, we don't
+                       # want to pile on top of that.
+                       $autoblock->mExpiry = min( $this->mExpiry, Block::getAutoblockExpiry( $timestamp ) );
                }
 
-               # Insert it
-               return $ipblock->insert();
+               # Insert the block...
+               $status = $autoblock->insert();
+               return $status
+                       ? $status['id']
+                       : false;
        }
 
        /**
@@ -687,12 +684,13 @@ class Block {
         * @return Boolean
         */
        public function isExpired() {
-               wfDebug( "Block::isExpired() checking current " . wfTimestampNow() . " vs $this->mExpiry\n" );
+               $timestamp = wfTimestampNow();
+               wfDebug( "Block::isExpired() checking current " . $timestamp . " vs $this->mExpiry\n" );
 
                if ( !$this->mExpiry ) {
                        return false;
                } else {
-                       return wfTimestampNow() > $this->mExpiry;
+                       return $timestamp > $this->mExpiry;
                }
        }
 
@@ -701,7 +699,7 @@ class Block {
         * @return Boolean
         */
        public function isValid() {
-               return $this->mAddress != '';
+               return $this->getTarget() != null;
        }
 
        /**
@@ -717,20 +715,58 @@ class Block {
                                array( /* SET */
                                        'ipb_timestamp' => $dbw->timestamp( $this->mTimestamp ),
                                        'ipb_expiry' => $dbw->timestamp( $this->mExpiry ),
-                               ), array( /* WHERE */
-                                       'ipb_address' => $this->mAddress
-                               ), 'Block::updateTimestamp'
+                               ),
+                               array( /* WHERE */
+                                       'ipb_address' => (string)$this->getTarget()
+                               ),
+                               __METHOD__
                        );
                }
        }
 
+       /**
+        * Get the IP address at the start of the range in Hex form
+        * @return String IP in Hex form
+        */
+       public function getRangeStart() {
+               switch( $this->type ) {
+                       case self::TYPE_USER:
+                               return '';
+                       case self::TYPE_IP:
+                               return IP::toHex( $this->target );
+                       case self::TYPE_RANGE:
+                               list( $start, /*...*/ ) = IP::parseRange( $this->target );
+                               return $start;
+                       default: throw new MWException( "Block with invalid type" );
+               }
+       }
+
+       /**
+        * Get the IP address at the start of the range in Hex form
+        * @return String IP in Hex form
+        */
+       public function getRangeEnd() {
+               switch( $this->type ) {
+                       case self::TYPE_USER:
+                               return '';
+                       case self::TYPE_IP:
+                               return IP::toHex( $this->target );
+                       case self::TYPE_RANGE:
+                               list( /*...*/, $end ) = IP::parseRange( $this->target );
+                               return $end;
+                       default: throw new MWException( "Block with invalid type" );
+               }
+       }
+
        /**
         * Get the user id of the blocking sysop
         *
         * @return Integer
         */
        public function getBy() {
-               return $this->mBy;
+               return $this->getBlocker() instanceof User
+                       ? $this->getBlocker()->getId()
+                       : 0;
        }
 
        /**
@@ -739,32 +775,102 @@ class Block {
         * @return String
         */
        public function getByName() {
-               return $this->mByName;
+               return $this->getBlocker() instanceof User
+                       ? $this->getBlocker()->getName()
+                       : null;
+       }
+
+       /**
+        * Get the block ID
+        * @return int
+        */
+       public function getId() {
+               return $this->mId;
        }
 
        /**
         * Get/set the SELECT ... FOR UPDATE flag
+        * @deprecated since 1.18
+        *
+        * @param $x Bool
         */
        public function forUpdate( $x = null ) {
-               return wfSetVar( $this->mForUpdate, $x );
+               # noop
        }
 
        /**
         * Get/set a flag determining whether the master is used for reads
+        *
+        * @param $x Bool
+        * @return Bool
         */
        public function fromMaster( $x = null ) {
                return wfSetVar( $this->mFromMaster, $x );
        }
 
+       /**
+        * Get/set whether the Block is a hardblock (affects logged-in users on a given IP/range
+        * @param $x Bool
+        * @return  Bool
+        */
+       public function isHardblock( $x = null ) {
+               wfSetVar( $this->isHardblock, $x );
+
+               # You can't *not* hardblock a user
+               return $this->getType() == self::TYPE_USER
+                       ? true
+                       : $this->isHardblock;
+       }
+
+       public function isAutoblocking( $x = null ) {
+               wfSetVar( $this->isAutoblocking, $x );
+
+               # You can't put an autoblock on an IP or range as we don't have any history to
+               # look over to get more IPs from
+               return $this->getType() == self::TYPE_USER
+                       ? $this->isAutoblocking
+                       : false;
+       }
+
+       /**
+        * Get/set whether the Block prevents a given action
+        * @param $action String
+        * @param $x Bool
+        * @return Bool
+        */
+       public function prevents( $action, $x = null ) {
+               switch( $action ) {
+                       case 'edit':
+                               # For now... <evil laugh>
+                               return true;
+
+                       case 'createaccount':
+                               return wfSetVar( $this->mCreateAccount, $x );
+
+                       case 'sendemail':
+                               return wfSetVar( $this->mBlockEmail, $x );
+
+                       case 'editownusertalk':
+                               return wfSetVar( $this->mDisableUsertalk, $x );
+
+                       default:
+                               return null;
+               }
+       }
+
        /**
         * Get the block name, but with autoblocked IPs hidden as per standard privacy policy
-        * @return String
+        * @return String, text is escaped
         */
        public function getRedactedName() {
                if ( $this->mAuto ) {
-                       return '#' . $this->mId;
+                       return Html::rawElement(
+                               'span',
+                               array( 'class' => 'mw-autoblockid' ),
+                               wfMessage( 'autoblockid', $this->mId )
+                       );
                } else {
-                       return $this->mAddress;
+                       return htmlspecialchars( $this->getTarget() );
                }
        }
 
@@ -774,33 +880,29 @@ class Block {
         * @param $expiry String: timestamp for expiry, or
         * @param $db Database object
         * @return String
+        * @deprecated since 1.18; use $dbw->encodeExpiry() instead
         */
        public static function encodeExpiry( $expiry, $db ) {
-               if ( $expiry == '' || $expiry == Block::infinity() ) {
-                       return Block::infinity();
-               } else {
-                       return $db->timestamp( $expiry );
-               }
+               return $db->encodeExpiry( $expiry );
        }
 
        /**
         * Decode expiry which has come from the DB
         *
         * @param $expiry String: Database expiry format
-        * @param $timestampType Requested timestamp format
+        * @param $timestampType Int Requested timestamp format
         * @return String
+        * @deprecated since 1.18; use $wgLang->formatExpiry() instead
         */
        public static function decodeExpiry( $expiry, $timestampType = TS_MW ) {
-               if ( $expiry == '' || $expiry == Block::infinity() ) {
-                       return Block::infinity();
-               } else {
-                       return wfTimestamp( $timestampType, $expiry );
-               }
+               global $wgContLang;
+               return $wgContLang->formatExpiry( $expiry, $timestampType );
        }
 
        /**
         * Get a timestamp of the expiry for autoblocks
         *
+        * @param $timestamp String|Int
         * @return String
         */
        public static function getAutoblockExpiry( $timestamp ) {
@@ -814,35 +916,10 @@ class Block {
         * For example, 127.111.113.151/24 -> 127.111.113.0/24
         * @param $range String: IP address to normalize
         * @return string
+        * @deprecated since 1.18, call IP::sanitizeRange() directly
         */
        public static function normaliseRange( $range ) {
-               $parts = explode( '/', $range );
-               if ( count( $parts ) == 2 ) {
-                       // IPv6
-                       if ( IP::isIPv6( $range ) && $parts[1] >= 64 && $parts[1] <= 128 ) {
-                               $bits = $parts[1];
-                               $ipint = IP::toUnsigned( $parts[0] );
-                               # Native 32 bit functions WON'T work here!!!
-                               # Convert to a padded binary number
-                               $network = wfBaseConvert( $ipint, 10, 2, 128 );
-                               # Truncate the last (128-$bits) bits and replace them with zeros
-                               $network = str_pad( substr( $network, 0, $bits ), 128, 0, STR_PAD_RIGHT );
-                               # Convert back to an integer
-                               $network = wfBaseConvert( $network, 2, 10 );
-                               # Reform octet address
-                               $newip = IP::toOctet( $network );
-                               $range = "$newip/{$parts[1]}";
-                       } // IPv4
-                       elseif ( IP::isIPv4( $range ) && $parts[1] >= 16 && $parts[1] <= 32 ) {
-                               $shift = 32 - $parts[1];
-                               $ipint = IP::toUnsigned( $parts[0] );
-                               $ipint = $ipint >> $shift << $shift;
-                               $newip = long2ip( $ipint );
-                               $range = "$newip/{$parts[1]}";
-                       }
-               }
-
-               return $range;
+               return IP::sanitizeRange( $range );
        }
 
        /**
@@ -856,7 +933,7 @@ class Block {
        /**
         * Get a value to insert into expiry field of the database when infinite expiry
         * is desired
-        *
+        * @deprecated since 1.18, call $dbr->getInfinity() directly
         * @return String
         */
        public static function infinity() {
@@ -868,8 +945,10 @@ class Block {
         *
         * @param $encoded_expiry String: Database encoded expiry time
         * @return Html-escaped String
+        * @deprecated since 1.18; use $wgLang->formatExpiry() instead
         */
        public static function formatExpiry( $encoded_expiry ) {
+               global $wgContLang;
                static $msg = null;
 
                if ( is_null( $msg ) ) {
@@ -881,8 +960,8 @@ class Block {
                        }
                }
 
-               $expiry = Block::decodeExpiry( $encoded_expiry );
-               if ( $expiry == 'infinity' ) {
+               $expiry = $wgContLang->formatExpiry( $encoded_expiry, TS_MW );
+               if ( $expiry == wfGetDB( DB_SLAVE )->getInfinity() ) {
                        $expirystr = $msg['infiniteblock'];
                } else {
                        global $wgLang;
@@ -895,78 +974,90 @@ class Block {
        }
 
        /**
-        * Convert a typed-in expiry time into something we can put into the database.
-        * @param $expiry_input String: whatever was typed into the form
-        * @return String: more database friendly
+        * Convert a submitted expiry time, which may be relative ("2 weeks", etc) or absolute
+        * ("24 May 2034"), into an absolute timestamp we can put into the database.
+        * @param $expiry String: whatever was typed into the form
+        * @return String: timestamp or "infinity" string for th DB implementation
+        * @deprecated since 1.18 moved to SpecialBlock::parseExpiryInput()
         */
-       public static function parseExpiryInput( $expiry_input ) {
-               if ( $expiry_input == 'infinite' || $expiry_input == 'indefinite' ) {
-                       $expiry = 'infinity';
-               } else {
-                       $expiry = strtotime( $expiry_input );
-
-                       if ( $expiry < 0 || $expiry === false ) {
-                               return false;
-                       }
-               }
-
-               return $expiry;
+       public static function parseExpiryInput( $expiry ) {
+               wfDeprecated( __METHOD__ );
+               return SpecialBlock::parseExpiryInput( $expiry );
        }
 
-       # FIXME: everything above here is a mess, needs much cleaning up
-
        /**
-        * Given a target and the target's type, get a Block object if possible
-        * @param $target String|User|Int a block target, which may be one of several types:
+        * Given a target and the target's type, get an existing Block object if possible.
+        * @param $specificTarget String|User|Int a block target, which may be one of several types:
         *     * A user to block, in which case $target will be a User
         *     * An IP to block, in which case $target will be a User generated by using
         *       User::newFromName( $ip, false ) to turn off name validation
         *     * An IP range, in which case $target will be a String "123.123.123.123/18" etc
-        *     * The ID of an existing block, in which case $target will be an Int
-        * @param $type Block::TYPE_ constant the type of block as described above
-        * @return Block|null (null if the target is not blocked)
+        *     * The ID of an existing block, in the format "#12345" (since pure numbers are valid
+        *       usernames
+        *     Calling this with a user, IP address or range will not select autoblocks, and will
+        *     only select a block where the targets match exactly (so looking for blocks on
+        *     1.2.3.4 will not select 1.2.0.0/16 or even 1.2.3.4/32)
+        * @param $vagueTarget String|User|Int as above, but we will search for *any* block which
+        *     affects that target (so for an IP address, get ranges containing that IP; and also
+        *     get any relevant autoblocks). Leave empty or blank to skip IP-based lookups.
+        * @param $fromMaster Bool whether to use the DB_MASTER database
+        * @return Block|null (null if no relevant block could be found).  The target and type
+        *     of the returned Block will refer to the actual block which was found, which might
+        *     not be the same as the target you gave if you used $vagueTarget!
         */
-       public static function newFromTargetAndType( $target, $type ){
-               if( $target instanceof User ){
-                       if( $type == Block::TYPE_IP ){
-                               return Block::newFromDB( $target->getName(), 0 );
-                       } elseif( $type == Block::TYPE_USER ) {
-                               return Block::newFromDB( '', $target->getId() );
-                       } else {
-                               # Should be unreachable;
-                               return null;
-                       }
-
-               } elseif( $type == Block::TYPE_RANGE ){
-                       return Block::newFromDB( '', $target );
+       public static function newFromTarget( $specificTarget, $vagueTarget = null, $fromMaster = false ) {
 
-               } elseif( $type == Block::TYPE_ID || $type == Block::TYPE_AUTO ){
+               list( $target, $type ) = self::parseTarget( $specificTarget );
+               if( $type == Block::TYPE_ID || $type == Block::TYPE_AUTO ){
                        return Block::newFromID( $target );
 
+               } elseif( $target === null && $vagueTarget == '' ){
+                       # We're not going to find anything useful here
+                       # Be aware that the == '' check is explicit, since empty values will be
+                       # passed by some callers (bug 29116)
+                       return null;
+
+               } elseif( in_array( $type, array( Block::TYPE_USER, Block::TYPE_IP, Block::TYPE_RANGE, null ) ) ) {
+                       $block = new Block();
+                       $block->fromMaster( $fromMaster );
+
+                       if( $type !== null ){
+                               $block->setTarget( $target );
+                       }
+
+                       if( $block->newLoad( $vagueTarget ) ){
+                               return $block;
+                       } else {
+                               return null;
+                       }
                } else {
                        return null;
                }
        }
 
-       public static function newFromTarget( $target ){
-               list( $target, $type ) = self::parseTarget( $target );
-               return self::newFromTargetAndType( $target, $type );
-       }
-
        /**
         * From an existing Block, get the target and the type of target.  Note that it is
         * always safe to treat the target as a string; for User objects this will return
         * User::__toString() which in turn gives User::getName().
+        *
+        * @param $target String|Int|User
         * @return array( User|String, Block::TYPE_ constant )
         */
-       public static function parseTarget( $target ){
+       public static function parseTarget( $target ) {
                $target = trim( $target );
 
-               $userObj = User::newFromName( $target );
-               if( $userObj instanceof User ){
-                       return array( $userObj, Block::TYPE_USER );
+               # We may have been through this before
+               if( $target instanceof User ){
+                       if( IP::isValid( $target->getName() ) ){
+                               return array( $target, self::TYPE_IP );
+                       } else {
+                               return array( $target, self::TYPE_USER );
+                       }
+               } elseif( $target === null ){
+                       return array( null, null );
+               }
 
-               } elseif( IP::isValid( $target ) ){
+               if ( IP::isValid( $target ) ) {
                        # We can still create a User if it's an IP address, but we need to turn
                        # off validation checking (which would exclude IP addresses)
                        return array(
@@ -974,25 +1065,88 @@ class Block {
                                Block::TYPE_IP
                        );
 
-               } elseif( IP::isValidBlock( $target ) ){
+               } elseif ( IP::isValidBlock( $target ) ) {
                        # Can't create a User from an IP range
-                       return array( Block::normaliseRange( $target ), Block::TYPE_RANGE );
+                       return array( IP::sanitizeRange( $target ), Block::TYPE_RANGE );
+               }
+
+               # Consider the possibility that this is not a username at all
+               # but actually an old subpage (bug #29797)
+               if( strpos( $target, '/' ) !== false ){
+                       # An old subpage, drill down to the user behind it
+                       $parts = explode( '/', $target );
+                       $target = $parts[0];
+               }
+
+               $userObj = User::newFromName( $target );
+               if ( $userObj instanceof User ) {
+                       # Note that since numbers are valid usernames, a $target of "12345" will be
+                       # considered a User.  If you want to pass a block ID, prepend a hash "#12345",
+                       # since hash characters are not valid in usernames or titles generally.
+                       return array( $userObj, Block::TYPE_USER );
 
-               } elseif( preg_match( '/^#\d+$/', $target ) ){
+               } elseif ( preg_match( '/^#\d+$/', $target ) ) {
                        # Autoblock reference in the form "#12345"
                        return array( substr( $target, 1 ), Block::TYPE_AUTO );
 
-               } elseif( preg_match( '/^\d+$/', $target ) ){
-                       # Block id reference as a pure number
-                       return array( $target, Block::TYPE_ID );
+               } else {
+                       # WTF?
+                       return array( null, null );
                }
        }
 
        /**
-        * Get the target and target type for this particular Block
+        * Get the type of target for this particular block
+        * @return Block::TYPE_ constant, will never be TYPE_ID
+        */
+       public function getType() {
+               return $this->mAuto
+                       ? self::TYPE_AUTO
+                       : $this->type;
+       }
+
+       /**
+        * Get the target and target type for this particular Block.  Note that for autoblocks,
+        * this returns the unredacted name; frontend functions need to call $block->getRedactedName()
+        * in this situation.
         * @return array( User|String, Block::TYPE_ constant )
+        * @todo FIXME: This should be an integral part of the Block member variables
+        */
+       public function getTargetAndType() {
+               return array( $this->getTarget(), $this->getType() );
+       }
+
+       /**
+        * Get the target for this particular Block.  Note that for autoblocks,
+        * this returns the unredacted name; frontend functions need to call $block->getRedactedName()
+        * in this situation.
+        * @return User|String
+        */
+       public function getTarget() {
+               return $this->target;
+       }
+
+       /**
+        * Set the target for this block, and update $this->type accordingly
+        * @param $target Mixed
+        */
+       public function setTarget( $target ){
+               list( $this->target, $this->type ) = self::parseTarget( $target );
+       }
+
+       /**
+        * Get the user who implemented this block
+        * @return User
+        */
+       public function getBlocker(){
+               return $this->blocker;
+       }
+
+       /**
+        * Set the user who implemented (or will implement) this block
+        * @param $user User
         */
-       public function getTargetAndType(){
-               return self::parseTarget( $this->mAddress );
+       public function setBlocker( User $user ){
+               $this->blocker = $user;
        }
 }