wikimedia/mediawiki-extensions-DonationInterface

<?php

class Gateway_Extras_CustomFilters_Source extends Gateway_Extras {

    /**
     * Container for an instance of self
     * @var Gateway_Extras_CustomFilters_Source
     */
    protected static $instance;

    /**
     * Custom filter object holder
     * @var Gateway_Extras_CustomFilters
     */
    protected $cfo;

    protected function __construct(
        GatewayType $gateway_adapter,
        Gateway_Extras_CustomFilters $custom_filter_object
    ) {
        parent::__construct( $gateway_adapter );
        $this->cfo = $custom_filter_object;
    }

    protected function filter() {
        // pull out the source from the filter object
        $source = $this->gateway_adapter->getData_Unstaged_Escaped( 'utm_source' );

        // a very complex filtering algorithm for sources
        $srcRules = $this->gateway_adapter->getGlobal( 'CustomFiltersSrcRules' );
        foreach ( $srcRules as $regex => $risk_score_modifier ) {
            /**
             * Note that regex pattern does not include delimiters.
             * These will need to be included in your custom regex patterns.
             */
            if ( preg_match( "$regex", $source ) ) {
                $this->cfo->addRiskScore( $risk_score_modifier, 'source' );

                // log it
                $log_msg = "\"" . addslashes( $source ) . "\"";
                $log_msg .= "\t\"" . addslashes( $regex ) . "\"";
                $log_msg .= "\t\"" . $this->cfo->getRiskScore() . "\"";
                $this->log(
                    $this->gateway_adapter->getData_Unstaged_Escaped( 'contribution_tracking_id' ), 'Filter: Source', $log_msg
                );
            }
        }

        return true;
    }

    public static function onInitialFilter(
        GatewayType $gateway_adapter,
        Gateway_Extras_CustomFilters $custom_filter_object
    ) {
        if ( !$gateway_adapter->getGlobal( 'EnableSourceFilter' ) ||
            !count( $gateway_adapter->getGlobal( 'CustomFiltersSrcRules' ) ) ) {
            return true;
        }
        $gateway_adapter->debugarray[] = 'source onFilter!';
        return self::singleton( $gateway_adapter, $custom_filter_object )->filter();
    }

    protected static function singleton(
        GatewayType $gateway_adapter,
        Gateway_Extras_CustomFilters $custom_filter_object
    ) {
        if ( !self::$instance ) {
            self::$instance = new self( $gateway_adapter, $custom_filter_object );
        }
        return self::$instance;
    }

}