File external/postcode-lookup.php

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<?php

namespace SIW\External;

/**
 * Opzoeken adres obv postcode en huisnummer
 *
 * @copyright 2019 SIW Internationale Vrijwilligersprojecten
 * @since     3.0.0
 * 
 * @link      https://github.com/PDOK/locatieserver
 */
class Postcode_Lookup{

    /**
     * Locatieserver URL voor postcode lookup
     *
     * @var string
     */
    const API_URL = 'https://geodata.nationaalgeoregister.nl/locatieserver/v3/free';

    /**
     * Zoekt straat en woonplaats op basis van postcode en huisnumme
     *
     * @param string $postcode
     * @param string $housenumber
     * @return array
     * 
     * @todo sanitize values
     */
    public function get_address( string $postcode, string $housenumber ) {
        $address = get_transient( "siw_address_{$postcode}_{$housenumber}" );
        if ( false === $address ) {
            $address = $this->retrieve_address( $postcode, $housenumber );
            if ( false === $address ) {
                return false;
            }
            set_transient( "siw_address_{$postcode}_{$housenumber}", $address, MONTH_IN_SECONDS );
        }
        return $address;
    }

    /**
     * Haalt adres op bij PostcodeAPI.nu
     *
     * @param string $postcode
     * @param string $housenumber
     * @return array
     */
    protected function retrieve_address( string $postcode, string $housenumber ) {
        $url = add_query_arg( [
            'q'  => "postcode:{$postcode}",
            'fq' => "huisnummer:{$housenumber}",
        ], self::API_URL );

        $args = [
            'timeout'     => 10,
            'redirection' => 0,
        ];

        $response = wp_safe_remote_get( $url, $args );
        if ( is_wp_error( $response ) ) {
            return false;
        }
    
        $statuscode = wp_remote_retrieve_response_code( $response );
        if ( \WP_Http::OK != $statuscode ) {
            return false;
        }

        $body = json_decode( wp_remote_retrieve_body( $response ) );

        if ( 0 === $body->response->numFound ) {
            return false;
        }

        $address = [
            'street' => $body->response->docs[0]->straatnaam,
            'city'   => $body->response->docs[0]->woonplaatsnaam,
        ];
        return $address;
    }
}

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