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 );
        if ( $this->target instanceof User ) {
            # Set the 'relevant user' in the skin, so it displays links like Contributions,
            # User logs, UserRights, etc.
            $this->getSkin()->setRelevantUser( $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_IP:
                    $out->addWikiMsg( 'unblocked-ip', wfEscapeWikiText( $this->target ) );
                    break;
                case Block::TYPE_USER:
                    $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' => 'ipaddressorusername',
                'autofocus' => true,
                'size' => '45',
                'required' => true,
            ),
            'Name' => array(
                'type' => 'info',
                'label-message' => 'ipaddressorusername',
            ),
            '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_IP:
                        $fields['Name']['default'] = Linker::linkKnown(
                            SpecialPage::getTitleFor( 'Contributions', $target->getName() ),
                            $target->getName()
                        );
                        $fields['Name']['raw'] = true;
                        break;
                    case Block::TYPE_USER:
                        $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;
                }
                // target is hidden, so the reason is the first element
                $fields['Target']['autofocus'] = false;
                $fields['Reason']['autofocus'] = true;
            }
        } 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'], array(), $performer );

        return true;
    }

    protected function getGroupName() {
        return 'users';
    }
}