Add support for currency switcher plugin

includes/Errors/ErrorCode.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace Razorpay\Woocommerce\Errors;
+
+require_once __DIR__.'/../../razorpay-sdk/Razorpay.php';
+
+use Razorpay\Api\Errors as ApiErrors;
+
+class ErrorCode extends ApiErrors\ErrorCode
+{
+    const INVALID_CURRENCY_ERROR_CODE          = 'INVALID_CURRENCY_ERROR';
+    const INVALID_CURRENCY_ERROR_MESSAGE       = 'The selected currency is invalid.';
+
+    const WOOCS_MISSING_ERROR_CODE             = 'WOOCS_MISSING_ERROR';
+    const WOOCS_MISSING_ERROR_MESSAGE          = 'The Woocommerce Currency Switcher plugin is missing.';
+
+    const WOOCS_CURRENCY_MISSING_ERROR_CODE    = 'WOOCS_CURRENCY_MISSING_ERROR';
+    const WOOCS_CURRENCY_MISSING_ERROR_MESSAGE = 'The current currency and INR needs to be configured in Woocommerce Currency Switcher plugin';
+
+}

razorpay-payments.php

@@ -14,9 +14,11 @@
 }
 
 require_once __DIR__.'/includes/razorpay-webhook.php';
+require_once __DIR__.'/includes/Errors/ErrorCode.php';
 
 use Razorpay\Api\Api;
 use Razorpay\Api\Errors;
+use Razorpay\Woocommerce\Errors as WooErrors;
 
 require_once __DIR__.'/razorpay-sdk/Razorpay.php';
 
@@ -33,15 +35,17 @@ function woocommerce_razorpay_init()
     class WC_Razorpay extends WC_Payment_Gateway
     {
         // This one stores the WooCommerce Order Id
-        const SESSION_KEY = 'razorpay_wc_order_id';
-        const RAZORPAY_PAYMENT_ID = 'razorpay_payment_id';
+        const SESSION_KEY                    = 'razorpay_wc_order_id';
+        const RAZORPAY_PAYMENT_ID            = 'razorpay_payment_id';
+
 
         public function __construct()
         {
             $this->id = 'razorpay';
             $this->method_title = 'Razorpay';
             $this->icon =  plugins_url('images/logo.png' , __FILE__);
             $this->has_fields = false;
+
             $this->init_form_fields();
             $this->init_settings();
             $this->title = $this->settings['title'];
@@ -176,7 +180,6 @@ function payment_fields()
          **/
         function receipt_page($order)
         {
-            echo '<p>'.__('Thank you for your order, please click the button below to pay with Razorpay.', 'razorpay').'</p>';
             echo $this->generate_razorpay_form($order);
         }
 
@@ -191,7 +194,7 @@ protected function getSessionKey($orderId)
          * that is is still correct. If not found
          * (or incorrect), create a new Razorpay Order
          * @param  string $orderId Order Id
-         * @return mixed Razorpay Order Id or null
+         * @return mixed Razorpay Order Id or Exception
          */
         protected function createOrGetRazorpayOrderId($orderId)
         {
@@ -228,13 +231,18 @@ protected function createOrGetRazorpayOrderId($orderId)
             {
                 try
                 {
-                    return $this->createRazorpayOrderId(
-                        $orderId, $sessionKey);
+                    return $this->createRazorpayOrderId($orderId, $sessionKey);
                 }
-                catch(Exception $e)
+                // For the bad request errors, it's safe to show the message to the customer.
+                catch (Errors\BadRequestError $e)
                 {
-                    // Order creation failed
-                    return null;
+                    return $e;
+                }
+                // For any other exceptions, we make sure that the error message
+                // does not propagate to the front-end.
+                catch (Exception $e)
+                {
+                    return new Exception("Payment failed");
                 }
             }
         }
@@ -251,14 +259,16 @@ public function generate_razorpay_form($orderId)
 
             $razorpayOrderId = $this->createOrGetRazorpayOrderId($orderId);
 
-            if ($razorpayOrderId === null)
+            if(is_a($razorpayOrderId, 'Exception'))
             {
-                return 'RAZORPAY ERROR: Api could not be reached';
+                $message = $razorpayOrderId->getMessage();
+                return 'RAZORPAY ERROR: Order creation failed with the message \'' . $message . '\'';
             }
 
             $checkoutArgs = $this->getCheckoutArguments($order, $razorpayOrderId);
 
-            $html = $this->generateOrderForm($redirectUrl, $checkoutArgs);
+            $html = '<p>'.__('Thank you for your order, please click the button below to pay with Razorpay.', 'razorpay').'</p>';
+            $html .= $this->generateOrderForm($redirectUrl, $checkoutArgs);
 
             return $html;
         }
@@ -275,17 +285,25 @@ protected function getCheckoutArguments($order, $razorpayOrderId)
             $productinfo = "Order $orderId";
 
             $args = array(
-              'key'          => $this->key_id,
-              'name'         => get_bloginfo('name'),
-              'currency'     => get_woocommerce_currency(),
-              'description'  => $productinfo,
-              'notes'        => array(
-                'woocommerce_order_id' => $orderId
-              ),
-              'order_id'     => $razorpayOrderId,
-              'callback_url' => $callbackUrl,
+              'key'              => $this->key_id,
+              'name'             => get_bloginfo('name'),
+              // Harcoding currency to INR, since if not INR, an exception gets thrown
+              'currency'         => 'INR',
+              // 'currency'     => get_woocommerce_currency(),
+              'description'      => $productinfo,
+              'notes'            => array(
+                                        'woocommerce_order_id' => $orderId
+                                    ),
+              'order_id'         => $razorpayOrderId,
+              'callback_url'     => $callbackUrl
             );
 
+            if ($order->get_currency() !== 'INR')
+            {
+                $args['display_currency'] = $order->get_currency();
+                $args['display_amount']   = $order->get_total();
+            }
+
             $args['amount'] = $this->getOrderAmountAsInteger($order);
 
             if (version_compare(WOOCOMMERCE_VERSION, '2.7.0', '>='))
@@ -329,13 +347,73 @@ protected function createRazorpayOrderId($orderId, $sessionKey)
             $api = $this->getRazorpayApiInstance();
 
             $data = $this->getOrderCreationData($orderId);
+
+            if ($data['currency'] !== 'INR')
+            {
+                if (class_exists('WOOCS'))
+                {
+                    $data = $this->convertCurrencyWoocs($data);
+                }
+                else
+                {
+                    throw new Errors\BadRequestError(
+                        WooErrors\ErrorCode::WOOCS_MISSING_ERROR_MESSAGE,
+                        WooErrors\ErrorCode::WOOCS_MISSING_ERROR_CODE,
+                        400
+                    );
+                }
+            }
+
             $razorpay_order = $api->order->create($data);
 
             $razorpayOrderId = $razorpay_order['id'];
 
             $woocommerce->session->set($sessionKey, $razorpayOrderId);
 
             return $razorpayOrderId;
+
+        }
+
+        /**
+         * Convert the currency to INR using rates fetched from Woocommerce Currency Switcher plugin
+         *
+         * @param Array $data
+         *
+         * @return Array
+         *
+         **/
+        protected function convertCurrencyWoocs($data)
+        {
+            global $WOOCS;
+
+            $currencies = $WOOCS->get_currencies();
+
+            $value = $data['amount'] * $currencies[$WOOCS->current_currency]['rate'];
+
+            if (array_key_exists('INR', $currencies) and array_key_exists($data['currency'], $currencies))
+            {
+                // If the currenct currency is the same as the default currency set in WooCommerce,
+                // Currency Switcher plugin sets the rate of currenct currency as 0, because of which
+                // we need to set this to 1 here if it's value is 0
+                $current_currency_rate = ($currencies[$data['currency']]['rate'] == 0 ? 1 : $currencies[$data['currency']]['rate']);
+
+                // Convert the currency to INR using the rates fetched from the Currency Switcher plugin
+                $data['amount'] = round(
+                    (($data['amount'] * $currencies['INR']['rate']) / $current_currency_rate),
+                    0
+                );
+                $data['currency'] = 'INR';
+                return $data;
+            }
+            else
+            {
+                throw new Errors\BadRequestError(
+                    WooErrors\ErrorCode::WOOCS_CURRENCY_MISSING_ERROR_MESSAGE,
+                    WooErrors\ErrorCode::WOOCS_CURRENCY_MISSING_ERROR_CODE,
+                    400
+                );
+
+            }
         }
 
         protected function verifyOrderAmount($razorpayOrderId, $orderId)

razorpay-sdk/src/Errors/ErrorCode.php

@@ -14,4 +14,4 @@ public static function exists($code)
 
         return defined(get_class() . '::' . $code);
     }
-}
+}