SpecialUnblock.php

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<?php
class SpecialUnblock extends SpecialPage {

        protected $target;
        protected $type;
        protected $block;

        public function __construct(){
                parent::__construct( 'Unblock', 'block' );
        }

        public function execute( $par ){
                $this->checkPermissions();
                $this->checkReadOnly();

                list( $this->target, $this->type ) = SpecialBlock::getTargetAndType( $par, $this->getRequest() );
                $this->block = Block::newFromTarget( $this->target );

                $this->setHeaders();
                $this->outputHeader();

                $out = $this->getOutput();
                $out->setPageTitle( $this->msg( 'unblockip' ) );
                $out->addModules( 'mediawiki.special' );

                $form = new HTMLForm( $this->getFields(), $this->getContext() );
                $form->setWrapperLegendMsg( 'unblockip' );
                $form->setSubmitCallback( array( __CLASS__, 'processUIUnblock' ) );
                $form->setSubmitTextMsg( 'ipusubmit' );
                $form->addPreText( $this->msg( 'unblockiptext' )->parseAsBlock() );

                if( $form->show() ){
                        switch( $this->type ){
                                case Block::TYPE_USER:
                                case Block::TYPE_IP:
                                        $out->addWikiMsg( 'unblocked', wfEscapeWikiText( $this->target ) );
                                        break;
                                case Block::TYPE_RANGE:
                                        $out->addWikiMsg( 'unblocked-range', wfEscapeWikiText( $this->target ) );
                                        break;
                                case Block::TYPE_ID:
                                case Block::TYPE_AUTO:
                                        $out->addWikiMsg( 'unblocked-id', wfEscapeWikiText( $this->target ) );
                                        break;
                        }
                }
        }

        protected function getFields(){
                $fields = array(
                        'Target' => array(
                                'type' => 'text',
                                'label-message' => 'ipadressorusername',
                                'tabindex' => '1',
                                'size' => '45',
                                'required' => true,
                        ),
                        'Name' => array(
                                'type' => 'info',
                                'label-message' => 'ipadressorusername',
                        ),
                        'Reason' => array(
                                'type' => 'text',
                                'label-message' => 'ipbreason',
                        )
                );

                if( $this->block instanceof Block ){
                        list( $target, $type ) = $this->block->getTargetAndType();

                        # Autoblocks are logged as "autoblock #123 because the IP was recently used by
                        # User:Foo, and we've just got any block, auto or not, that applies to a target
                        # the user has specified.  Someone could be fishing to connect IPs to autoblocks,
                        # so don't show any distinction between unblocked IPs and autoblocked IPs
                        if( $type == Block::TYPE_AUTO && $this->type == Block::TYPE_IP ){
                                $fields['Target']['default'] = $this->target;
                                unset( $fields['Name'] );

                        } else {
                                $fields['Target']['default'] = $target;
                                $fields['Target']['type'] = 'hidden';
                                switch( $type ){
                                        case Block::TYPE_USER:
                                        case Block::TYPE_IP:
                                                $fields['Name']['default'] = Linker::link(
                                                        $target->getUserPage(),
                                                        $target->getName()
                                                );
                                                $fields['Name']['raw'] = true;
                                                break;

                                        case Block::TYPE_RANGE:
                                                $fields['Name']['default'] = $target;
                                                break;

                                        case Block::TYPE_AUTO:
                                                $fields['Name']['default'] = $this->block->getRedactedName();
                                                $fields['Name']['raw'] = true;
                                                # Don't expose the real target of the autoblock
                                                $fields['Target']['default'] = "#{$this->target}";
                                                break;
                                }
                        }

                } else {
                        $fields['Target']['default'] = $this->target;
                        unset( $fields['Name'] );
                }
                return $fields;
        }

        public static function processUIUnblock( array $data, HTMLForm $form ) {
                return self::processUnblock( $data, $form->getContext() );
        }

        public static function processUnblock( array $data, IContextSource $context ){
                $performer = $context->getUser();
                $target = $data['Target'];
                $block = Block::newFromTarget( $data['Target'] );

                if( !$block instanceof Block ){
                        return array( array( 'ipb_cant_unblock', $target ) );
                }

                # bug 15810: blocked admins should have limited access here.  This
                # won't allow sysops to remove autoblocks on themselves, but they
                # should have ipblock-exempt anyway
                $status = SpecialBlock::checkUnblockSelf( $target, $performer );
                if ( $status !== true ) {
                        throw new ErrorPageError( 'badaccess', $status );
                }

                # If the specified IP is a single address, and the block is a range block, don't
                # unblock the whole range.
                list( $target, $type ) = SpecialBlock::getTargetAndType( $target );
                if( $block->getType() == Block::TYPE_RANGE && $type == Block::TYPE_IP ) {
                         $range = $block->getTarget();
                         return array( array( 'ipb_blocked_as_range', $target, $range ) );
                }

                # If the name was hidden and the blocking user cannot hide
                # names, then don't allow any block removals...
                if( !$performer->isAllowed( 'hideuser' ) && $block->mHideName ) {
                        return array( 'unblock-hideuser' );
                }

                # Delete block
                if ( !$block->delete() ) {
                        return array( 'ipb_cant_unblock', htmlspecialchars( $block->getTarget() ) );
                }

                # Unset _deleted fields as needed
                if( $block->mHideName ) {
                        # Something is deeply FUBAR if this is not a User object, but who knows?
                        $id = $block->getTarget() instanceof User
                                ? $block->getTarget()->getID()
                                : User::idFromName( $block->getTarget() );

                        RevisionDeleteUser::unsuppressUserName( $block->getTarget(), $id );
                }

                # Redact the name (IP address) for autoblocks
                if ( $block->getType() == Block::TYPE_AUTO ) {
                        $page = Title::makeTitle( NS_USER, '#' . $block->getId() );
                } else {
                        $page = $block->getTarget() instanceof User
                                ? $block->getTarget()->getUserpage()
                                : Title::makeTitle( NS_USER, $block->getTarget() );
                }

                # Make log entry
                $log = new LogPage( 'block' );
                $log->addEntry( 'unblock', $page, $data['Reason'] );

                return true;
        }
}