BlockUtils.php

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<?php
 
namespace MediaWiki\Block;
 
use MediaWiki\Config\ServiceOptions;
use MediaWiki\User\UserFactory;
use MediaWiki\User\UserIdentity;
use Status;
use User;
use Wikimedia\IPUtils;
 
class BlockUtils {
    private $options;
 
    private $userFactory;
 
    public const CONSTRUCTOR_OPTIONS = [
        'BlockCIDRLimit',
    ];
 
    public function __construct(
        ServiceOptions $options,
        UserFactory $userFactory
    ) {
        $options->assertRequiredOptions( self::CONSTRUCTOR_OPTIONS );
        $this->options = $options;
        $this->userFactory = $userFactory;
    }
 
    public function parseBlockTarget( $target ) : array {
        // We may have been through this before
        if ( $target instanceof UserIdentity ) {
            $userObj = $this->userFactory->newFromUserIdentity( $target );
            if ( IPUtils::isValid( $target->getName() ) ) {
                return [ $userObj, AbstractBlock::TYPE_IP ];
            } else {
                return [ $userObj, AbstractBlock::TYPE_USER ];
            }
        } elseif ( $target === null ) {
            return [ null, null ];
        }
 
        $target = trim( $target );
 
        if ( IPUtils::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 [
                $this->userFactory->newFromName(
                    IPUtils::sanitizeIP( $target ),
                    UserFactory::RIGOR_NONE
                ),
                AbstractBlock::TYPE_IP
            ];
 
        } elseif ( IPUtils::isValidRange( $target ) ) {
            // Can't create a User from an IP range
            return [ IPUtils::sanitizeRange( $target ), AbstractBlock::TYPE_RANGE ];
        }
 
        // Consider the possibility that this is not a username at all
        // but actually an old subpage (T31797)
        if ( strpos( $target, '/' ) !== false ) {
            // An old subpage, drill down to the user behind it
            $target = explode( '/', $target )[0];
        }
 
        $userObj = $this->userFactory->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 [ $userObj, AbstractBlock::TYPE_USER ];
        } elseif ( preg_match( '/^#\d+$/', $target ) ) {
            // Autoblock reference in the form "#12345"
            return [ substr( $target, 1 ), AbstractBlock::TYPE_AUTO ];
        } else {
            return [ null, null ];
        }
    }
 
    public function validateTarget( $value ) : Status {
        list( $target, $type ) = $this->parseBlockTarget( $value );
 
        $status = Status::newGood( $target );
 
        switch ( $type ) {
            case AbstractBlock::TYPE_USER:
                if ( $target->isAnon() ) {
                    $status->fatal(
                        'nosuchusershort',
                        wfEscapeWikiText( $target->getName() )
                    );
                }
                break;
 
            case AbstractBlock::TYPE_RANGE:
                list( $ip, $range ) = explode( '/', $target, '2' );
 
                if ( IPUtils::isIPv4( $ip ) ) {
                    $status->merge( $this->validateIPv4Range( $range ) );
                } elseif ( IPUtils::isIPv6( $ip ) ) {
                    $status->merge( $this->validateIPv6Range( $range ) );
                } else {
                    // Something is FUBAR
                    $status->fatal( 'badipaddress' );
                }
                break;
 
            case AbstractBlock::TYPE_IP:
                // All is well
                break;
 
            default:
                $status->fatal( 'badipaddress' );
                break;
        }
 
        return $status;
    }
 
    private function validateIPv4Range( int $range ) : Status {
        $status = Status::newGood();
        $blockCIDRLimit = $this->options->get( 'BlockCIDRLimit' );
 
        if ( $blockCIDRLimit['IPv4'] == 32 ) {
            // Range block effectively disabled
            $status->fatal( 'range_block_disabled' );
        } elseif ( $range > 32 ) {
            // Such a range cannot exist
            $status->fatal( 'ip_range_invalid' );
        } elseif ( $range < $blockCIDRLimit['IPv4'] ) {
            $status->fatal( 'ip_range_toolarge', $blockCIDRLimit['IPv4'] );
        }
 
        return $status;
    }
 
    private function validateIPv6Range( int $range ) : Status {
        $status = Status::newGood();
        $blockCIDRLimit = $this->options->get( 'BlockCIDRLimit' );
 
        if ( $blockCIDRLimit['IPv6'] == 128 ) {
            // Range block effectively disabled
            $status->fatal( 'range_block_disabled' );
        } elseif ( $range > 128 ) {
            // Dodgy range - such a range cannot exist
            $status->fatal( 'ip_range_invalid' );
        } elseif ( $range < $blockCIDRLimit['IPv6'] ) {
            $status->fatal( 'ip_range_toolarge', $blockCIDRLimit['IPv6'] );
        }
 
        return $status;
    }
}