File external/exchange-rates.php

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<?php

namespace SIW\External;

/**
 * Ophalen wisselkoersen bij fixer.io
 *
 * @copyright 2019 SIW Internationale Vrijwilligersprojecten
 * @since     3.0.0
 * 
 * @link      https://fixer.io/documentation
 */
class Exchange_Rates{

    /**
     * API url
     *
     * @var string
     */
    const API_URL = 'http://data.fixer.io/api/latest';

    /**
     * API key
     *
     * @var string
     */
    protected $api_key;

    /**
     * Transient naam
     *
     * @var string
     */
    protected $transient_name = 'siw_exchange_rates';

    /**
     * Constructor
     */
    public function __construct() {
        $this->api_key = siw_get_option( 'exchange_rates_api_key' );
        if ( empty( $this->api_key ) ) {
            return;
        }
    }

    /**
     * Geeft wisselkoersen terug
     * 
     * @return array
     */
    public function get_rates() {
        $exchange_rates = get_transient( $this->transient_name );

        if ( false === $exchange_rates ) {
            $exchange_rates = $this->retrieve_rates();
            if ( false == $exchange_rates ) {
                return false;
            }
            set_transient( $this->transient_name, $exchange_rates, DAY_IN_SECONDS );
        }
        return $exchange_rates;
    }

    /**
     * Haalt wisselkoeren op bij fixer.io
     * 
     * @return array
     */
    protected function retrieve_rates() {
        $url = add_query_arg( [
            'access_key' => $this->api_key,
        ], self::API_URL );

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

        $response = wp_safe_remote_get( $url, $args );

        if ( false === $this->check_response( $response ) ) {
            return false;
        }

        $body = json_decode( wp_remote_retrieve_body( $response ), true );
        if ( false == $body['success'] ) {
            return false;
        }
    
        $exchange_rates = [];
        foreach ( $body['rates'] as $currency => $rate ) {
            $exchange_rates[ $currency ] = 1 / $rate;
        }
        return $exchange_rates;
    }

    /**
     * Controleert response
     *
     * @param array|\WP_Error $response
     * @return bool
     */
    protected function check_response( $response ) {
        if ( is_wp_error( $response ) ) {
            return false;
        }
    
        $statuscode = wp_remote_retrieve_response_code( $response );
        if ( \WP_Http::OK != $statuscode ) {
            return false;
        }
        return true;
    }

}

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