Add PPEC Helper class

modules/ppcp-compat/src/PPEC/class-ppechelper.php

@@ -0,0 +1,81 @@
+<?php
+/**
+ * PayPal Express Checkout helper class.
+ *
+ * @package WooCommerce\PayPalCommerce\Compat\PPEC
+ */
+
+namespace WooCommerce\PayPalCommerce\Compat\PPEC;
+
+/**
+ * Helper class with various constants associated to the PayPal Express Checkout plugin, as well as methods for figuring
+ * out the status of the gateway.
+ */
+class PPECHelper {
+
+	/**
+	 * The PayPal Express Checkout gateway ID.
+	 */
+	const PPEC_GATEWAY_ID = 'ppec_paypal';
+
+	/**
+	 * The path to the PayPal Express Checkout main plugin file.
+	 */
+	const PPEC_PLUGIN_FILE = 'woocommerce-gateway-paypal-express-checkout/woocommerce-gateway-paypal-express-checkout.php';
+
+	/**
+	 * Option name for PayPal Express Checkout settings.
+	 */
+	const PPEC_SETTINGS_OPTION_NAME = 'woocommerce_ppec_paypal_settings';
+
+
+	/**
+	 * Checks if the PayPal Express Checkout plugin is active.
+	 *
+	 * @return bool
+	 */
+	public static function is_plugin_active() {
+		return is_callable( 'wc_gateway_ppec' );
+	}
+
+	/**
+	 * Checks whether the PayPal Express Checkout plugin is available (plugin active and gateway configured).
+	 *
+	 * @return bool
+	 */
+	public static function is_gateway_available() {
+		return self::is_plugin_active() && is_callable( 'wc_gateway_ppec' ) && wc_gateway_ppec()->settings->get_active_api_credentials();
+	}
+
+	/**
+	 * Checks whether the site has subscriptions handled through PayPal Express Checkout.
+	 *
+	 * @return bool
+	 */
+	public static function site_has_ppec_subscriptions() {
+		global $wpdb;
+
+		$result = $wpdb->get_var(
+			$wpdb->prepare(
+				"SELECT 1 FROM {$wpdb->posts} p JOIN {$wpdb->postmeta} pm ON pm.post_id = p.ID
+				WHERE p.post_type = %s AND p.post_status != %s AND pm.meta_key = %s AND pm.meta_value = %s LIMIT 1",
+				'shop_subscription',
+				'trash',
+				'_payment_method',
+				self::PPEC_GATEWAY_ID
+			)
+		);
+
+		return ! empty( $result );
+	}
+
+	/**
+	 * Checks whether the compatibility layer for PPEC Subscriptions should be initialized.
+	 *
+	 * @return bool
+	 */
+	public static function use_ppec_compat_layer_for_subscriptions() {
+		return ( ! self::is_gateway_available() ) && self::site_has_ppec_subscriptions() && apply_filters( 'woocommerce_paypal_payments_process_legacy_subscriptions', true );
+	}
+
+}