MWRestrictions.php

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<?php
class MWRestrictions {

    private $ipAddresses = [ '0.0.0.0/0', '::/0' ];

    protected function __construct( array $restrictions = null ) {
        if ( $restrictions !== null ) {
            $this->loadFromArray( $restrictions );
        }
    }

    public static function newDefault() {
        return new self();
    }

    public static function newFromArray( array $restrictions ) {
        return new self( $restrictions );
    }

    public static function newFromJson( $json ) {
        $restrictions = FormatJson::decode( $json, true );
        if ( !is_array( $restrictions ) ) {
            throw new InvalidArgumentException( 'Invalid restrictions JSON' );
        }
        return new self( $restrictions );
    }

    private function loadFromArray( array $restrictions ) {
        static $validKeys = [ 'IPAddresses' ];
        static $neededKeys = [ 'IPAddresses' ];

        $keys = array_keys( $restrictions );
        $invalidKeys = array_diff( $keys, $validKeys );
        if ( $invalidKeys ) {
            throw new InvalidArgumentException(
                'Array contains invalid keys: ' . implode( ', ', $invalidKeys )
            );
        }
        $missingKeys = array_diff( $neededKeys, $keys );
        if ( $missingKeys ) {
            throw new InvalidArgumentException(
                'Array is missing required keys: ' . implode( ', ', $missingKeys )
            );
        }

        if ( !is_array( $restrictions['IPAddresses'] ) ) {
            throw new InvalidArgumentException( 'IPAddresses is not an array' );
        }
        foreach ( $restrictions['IPAddresses'] as $ip ) {
            if ( !\IP::isIPAddress( $ip ) ) {
                throw new InvalidArgumentException( "Invalid IP address: $ip" );
            }
        }
        $this->ipAddresses = $restrictions['IPAddresses'];
    }

    public function toArray() {
        return [
            'IPAddresses' => $this->ipAddresses,
        ];
    }

    public function toJson( $pretty = false ) {
        return FormatJson::encode( $this->toArray(), $pretty, FormatJson::ALL_OK );
    }

    public function __toString() {
        return $this->toJson();
    }

    public function check( WebRequest $request ) {
        $ok = [
            'ip' => $this->checkIP( $request->getIP() ),
        ];
        $status = Status::newGood();
        $status->setResult( $ok === array_filter( $ok ), $ok );
        return $status;
    }

    public function checkIP( $ip ) {
        foreach ( $this->ipAddresses as $range ) {
            if ( \IP::isInRange( $ip, $range ) ) {
                return true;
            }
        }

        return false;
    }
}