feat: support Stripe payment provider (#2204)

* feat: add stripe payment provider

* feat: support stripe payment

* feat: delete todo comment

* feat: remove description struct

* feat: change outOrderId->orderId

pp/alipay.go

@@ -90,7 +90,7 @@ func (pp *AlipayPaymentProvider) Notify(request *http.Request, body []byte, auth
 		ProductName:        productName,
 		ProductDisplayName: productDisplayName,
 		ProviderName:       providerName,
-		OutOrderId:         orderId,
+		OrderId:            orderId,
 		PaymentStatus:      PaymentStatePaid,
 		Price:              price,
 		PaymentName:        paymentName,

pp/gc.go

@@ -255,7 +255,7 @@ func (pp *GcPaymentProvider) Notify(request *http.Request, body []byte, authorit
 		ProductName:        productName,
 		ProductDisplayName: productDisplayName,
 		ProviderName:       providerName,
-		OutOrderId:         orderId,
+		OrderId:            orderId,
 		Price:              price,
 		PaymentStatus:      PaymentStatePaid,
 		PaymentName:        paymentName,

pp/paypal.go

@@ -52,13 +52,12 @@ func NewPaypalPaymentProvider(clientID string, secret string) (*PaypalPaymentPro
 
 func (pp *PaypalPaymentProvider) Pay(providerName string, productName string, payerName string, paymentName string, productDisplayName string, price float64, currency string, returnUrl string, notifyUrl string) (string, string, error) {
 	// https://github.com/go-pay/gopay/blob/main/doc/paypal.md
-	priceStr := strconv.FormatFloat(price, 'f', 2, 64)
 	units := make([]*paypal.PurchaseUnit, 0, 1)
 	unit := &paypal.PurchaseUnit{
 		ReferenceId: util.GetRandomString(16),
 		Amount: &paypal.Amount{
-			CurrencyCode: currency, // e.g."USD"
-			Value:        priceStr, // e.g."100.00"
+			CurrencyCode: currency,                    // e.g."USD"
+			Value:        priceFloat64ToString(price), // e.g."100.00"
 		},
 		Description: joinAttachString([]string{productDisplayName, productName, providerName}),
 	}
@@ -147,16 +146,15 @@ func (pp *PaypalPaymentProvider) Notify(request *http.Request, body []byte, auth
 		paymentStatus = PaymentStateError
 	}
 	notifyResult = &NotifyResult{
-		PaymentStatus: paymentStatus,
-		PaymentName:   paymentName,
-
+		PaymentStatus:      paymentStatus,
+		PaymentName:        paymentName,
 		ProductName:        productName,
 		ProductDisplayName: productDisplayName,
 		ProviderName:       providerName,
 		Price:              price,
 		Currency:           currency,
 
-		OutOrderId: orderId,
+		OrderId: orderId,
 	}
 	return notifyResult, nil
 }

pp/provider.go

@@ -24,6 +24,7 @@ const (
 	PaymentStatePaid     PaymentState = "Paid"
 	PaymentStateCreated  PaymentState = "Created"
 	PaymentStateCanceled PaymentState = "Canceled"
+	PaymentStateTimeout  PaymentState = "Timeout"
 	PaymentStateError    PaymentState = "Error"
 )
 
@@ -32,13 +33,13 @@ type NotifyResult struct {
 	PaymentStatus PaymentState
 	NotifyMessage string
 
-	ProviderName       string
 	ProductName        string
 	ProductDisplayName string
+	ProviderName       string
 	Price              float64
 	Currency           string
 
-	OutOrderId string
+	OrderId string
 }
 
 type PaymentProvider interface {
@@ -75,6 +76,12 @@ func GetPaymentProvider(typ string, clientId string, clientSecret string, host s
 			return nil, err
 		}
 		return pp, nil
+	} else if typ == "Stripe" {
+		pp, err := NewStripePaymentProvider(clientId, clientSecret)
+		if err != nil {
+			return nil, err
+		}
+		return pp, nil
 	}
 
 	return nil, nil

pp/stripe.go

@@ -0,0 +1,166 @@
+// Copyright 2023 The Casdoor Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package pp
+
+import (
+	"fmt"
+	"net/http"
+	"time"
+
+	"github.com/casdoor/casdoor/conf"
+	"github.com/stripe/stripe-go/v74"
+	stripeCheckout "github.com/stripe/stripe-go/v74/checkout/session"
+	stripeIntent "github.com/stripe/stripe-go/v74/paymentintent"
+	stripePrice "github.com/stripe/stripe-go/v74/price"
+	stripeProduct "github.com/stripe/stripe-go/v74/product"
+)
+
+type StripePaymentProvider struct {
+	PublishableKey string
+	SecretKey      string
+	isProd         bool
+}
+
+func NewStripePaymentProvider(PublishableKey, SecretKey string) (*StripePaymentProvider, error) {
+	isProd := false
+	if conf.GetConfigString("runmode") == "prod" {
+		isProd = true
+	}
+	pp := &StripePaymentProvider{
+		PublishableKey: PublishableKey,
+		SecretKey:      SecretKey,
+		isProd:         isProd,
+	}
+	stripe.Key = pp.SecretKey
+	return pp, nil
+}
+
+func (pp *StripePaymentProvider) Pay(providerName string, productName string, payerName string, paymentName string, productDisplayName string, price float64, currency string, returnUrl string, notifyUrl string) (payUrl string, orderId string, err error) {
+	// Create a temp product
+	description := joinAttachString([]string{productName, productDisplayName, providerName})
+	productParams := &stripe.ProductParams{
+		Name:        stripe.String(productDisplayName),
+		Description: stripe.String(description),
+		DefaultPriceData: &stripe.ProductDefaultPriceDataParams{
+			UnitAmount: stripe.Int64(priceFloat64ToInt64(price)),
+			Currency:   stripe.String(currency),
+		},
+	}
+	sProduct, err := stripeProduct.New(productParams)
+	if err != nil {
+		return "", "", err
+	}
+	// Create a price for an existing product
+	priceParams := &stripe.PriceParams{
+		Currency:   stripe.String(currency),
+		UnitAmount: stripe.Int64(priceFloat64ToInt64(price)),
+		Product:    stripe.String(sProduct.ID),
+	}
+	sPrice, err := stripePrice.New(priceParams)
+	if err != nil {
+		return "", "", err
+	}
+	// Create a Checkout Session
+	checkoutParams := &stripe.CheckoutSessionParams{
+		LineItems: []*stripe.CheckoutSessionLineItemParams{
+			{
+				Price:    stripe.String(sPrice.ID),
+				Quantity: stripe.Int64(1),
+			},
+		},
+		Mode:              stripe.String(string(stripe.CheckoutSessionModePayment)),
+		SuccessURL:        stripe.String(returnUrl),
+		CancelURL:         stripe.String(returnUrl),
+		ClientReferenceID: stripe.String(paymentName),
+		ExpiresAt:         stripe.Int64(time.Now().Add(30 * time.Minute).Unix()),
+	}
+	checkoutParams.AddMetadata("product_description", description)
+	sCheckout, err := stripeCheckout.New(checkoutParams)
+	if err != nil {
+		return "", "", err
+	}
+	return sCheckout.URL, sCheckout.ID, nil
+}
+
+func (pp *StripePaymentProvider) Notify(request *http.Request, body []byte, authorityPublicKey string, orderId string) (*NotifyResult, error) {
+	notifyResult := &NotifyResult{}
+	sCheckout, err := stripeCheckout.Get(orderId, nil)
+	if err != nil {
+		return nil, err
+	}
+	switch sCheckout.Status {
+	case "open":
+		// The checkout session is still in progress. Payment processing has not started
+		notifyResult.PaymentStatus = PaymentStateCreated
+		return notifyResult, nil
+	case "complete":
+		// The checkout session is complete. Payment processing may still be in progress
+	case "expired":
+		// The checkout session has expired. No further processing will occur
+		notifyResult.PaymentStatus = PaymentStateTimeout
+		return notifyResult, nil
+	default:
+		notifyResult.PaymentStatus = PaymentStateError
+		notifyResult.NotifyMessage = fmt.Sprintf("unexpected stripe checkout status: %v", sCheckout.Status)
+		return notifyResult, nil
+	}
+	switch sCheckout.PaymentStatus {
+	case "paid":
+		// Skip
+	case "unpaid":
+		notifyResult.PaymentStatus = PaymentStateCreated
+		return notifyResult, nil
+	default:
+		notifyResult.PaymentStatus = PaymentStateError
+		notifyResult.NotifyMessage = fmt.Sprintf("unexpected stripe checkout payment status: %v", sCheckout.PaymentStatus)
+		return notifyResult, nil
+	}
+	// Once payment is successful, the Checkout Session will contain a reference to the successful `PaymentIntent`
+	sIntent, err := stripeIntent.Get(sCheckout.PaymentIntent.ID, nil)
+	var (
+		productName        string
+		productDisplayName string
+		providerName       string
+	)
+	if description, ok := sCheckout.Metadata["product_description"]; ok {
+		productName, productDisplayName, providerName, _ = parseAttachString(description)
+	}
+	notifyResult = &NotifyResult{
+		PaymentName:   sCheckout.ClientReferenceID,
+		PaymentStatus: PaymentStatePaid,
+
+		ProductName:        productName,
+		ProductDisplayName: productDisplayName,
+		ProviderName:       providerName,
+
+		Price:    priceInt64ToFloat64(sIntent.Amount),
+		Currency: string(sIntent.Currency),
+
+		OrderId: orderId,
+	}
+	return notifyResult, nil
+}
+
+func (pp *StripePaymentProvider) GetInvoice(paymentName string, personName string, personIdCard string, personEmail string, personPhone string, invoiceType string, invoiceTitle string, invoiceTaxId string) (string, error) {
+	return "", nil
+}
+
+func (pp *StripePaymentProvider) GetResponseError(err error) string {
+	if err == nil {
+		return "success"
+	} else {
+		return "fail"
+	}
+}

pp/util.go

@@ -16,6 +16,8 @@ package pp
 
 import (
 	"fmt"
+	"math"
+	"strconv"
 	"strings"
 )
 
@@ -35,3 +37,15 @@ func parseAttachString(s string) (string, string, string, error) {
 	}
 	return tokens[0], tokens[1], tokens[2], nil
 }
+
+func priceInt64ToFloat64(price int64) float64 {
+	return float64(price) / 100
+}
+
+func priceFloat64ToInt64(price float64) int64 {
+	return int64(math.Round(price * 100))
+}
+
+func priceFloat64ToString(price float64) string {
+	return strconv.FormatFloat(price, 'f', 2, 64)
+}

pp/wechatpay.go

@@ -113,7 +113,7 @@ func (pp *WechatPaymentProvider) Notify(request *http.Request, body []byte, auth
 		ProductName:        productName,
 		ProductDisplayName: productDisplayName,
 		ProviderName:       providerName,
-		OutOrderId:         orderId,
+		OrderId:            orderId,
 		Price:              price,
 		PaymentStatus:      PaymentStatePaid,
 		PaymentName:        paymentName,