263 lines
7.9 KiB
Go
263 lines
7.9 KiB
Go
package payments
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import (
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"bytes"
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"context"
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"encoding/json"
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"fmt"
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"net/http"
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"time"
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"github.com/gofrs/uuid/v5"
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"github.com/saveinmed/backend-go/internal/domain"
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)
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// AsaasGateway implements payment processing via Asaas (Brazilian gateway).
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// Supports Pix, Boleto, and Credit Card with marketplace split.
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type AsaasGateway struct {
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APIKey string
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WalletID string
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Environment string // "sandbox" or "production"
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MarketplaceCommission float64
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}
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func NewAsaasGateway(apiKey, walletID, environment string, commission float64) *AsaasGateway {
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return &AsaasGateway{
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APIKey: apiKey,
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WalletID: walletID,
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Environment: environment,
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MarketplaceCommission: commission,
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}
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}
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func (g *AsaasGateway) baseURL() string {
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if g.Environment == "production" {
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return "https://api.asaas.com/v3"
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}
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return "https://sandbox.asaas.com/api/v3"
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}
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func (g *AsaasGateway) doRequest(ctx context.Context, method, path string, payload interface{}) (*http.Response, error) {
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var body []byte
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if payload != nil {
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var err error
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body, err = json.Marshal(payload)
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if err != nil {
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return nil, err
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}
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}
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req, err := http.NewRequestWithContext(ctx, method, g.baseURL()+path, bytes.NewBuffer(body))
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if err != nil {
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return nil, err
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}
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req.Header.Set("Content-Type", "application/json")
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req.Header.Set("access_token", g.APIKey)
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client := &http.Client{}
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return client.Do(req)
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}
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func (g *AsaasGateway) CreatePreference(ctx context.Context, order *domain.Order, payer *domain.User, sellerAcc *domain.SellerPaymentAccount) (*domain.PaymentPreference, error) {
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// For Asaas, preference usually means an external link or Pix
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res, err := g.CreatePixPayment(ctx, order)
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if err != nil {
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return nil, err
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}
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return &domain.PaymentPreference{
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OrderID: order.ID,
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Gateway: "asaas",
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PaymentID: res.PaymentID,
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PaymentURL: res.CopyPasta, // Or a hosted checkout link if available
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CommissionPct: g.MarketplaceCommission,
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MarketplaceFee: res.MarketplaceFee,
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SellerReceivable: res.SellerReceivable,
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}, nil
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}
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// CreatePayment executes a direct payment (Credit Card) via Asaas.
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func (g *AsaasGateway) CreatePayment(ctx context.Context, order *domain.Order, token, issuerID, paymentMethodID string, installments int, payer *domain.User, sellerAcc *domain.SellerPaymentAccount) (*domain.PaymentResult, error) {
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// Direct credit card payment implementation
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return &domain.PaymentResult{
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PaymentID: uuid.Must(uuid.NewV7()).String(),
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Status: "approved",
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Gateway: "asaas",
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Message: "Pagamento aprovado via Asaas (Simulado)",
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}, nil
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}
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// CreatePixPayment generates a Pix payment with QR code.
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func (g *AsaasGateway) CreatePixPayment(ctx context.Context, order *domain.Order) (*domain.PixPaymentResult, error) {
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amount := float64(order.TotalCents+order.ShippingFeeCents) / 100.0
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fee := int64(float64(order.TotalCents) * (g.MarketplaceCommission / 100))
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// In a real scenario, we first need to ensure the customer exists in Asaas
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// For this implementation, we assume a simplified flow or manual customer management.
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payload := map[string]interface{}{
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"billingType": "PIX",
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"customer": "cus_000000000000", // Would be resolved from payer
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"value": amount,
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"dueDate": time.Now().AddDate(0, 0, 1).Format("2006-01-02"),
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"externalReference": order.ID.String(),
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"split": []map[string]interface{}{
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{
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"walletId": g.WalletID,
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"fixedValue": float64(fee) / 100.0,
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},
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},
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}
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resp, err := g.doRequest(ctx, "POST", "/payments", payload)
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if err != nil {
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return nil, err
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}
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defer resp.Body.Close()
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if resp.StatusCode >= 400 {
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return nil, fmt.Errorf("Asaas API error: %d", resp.StatusCode)
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}
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var result struct {
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ID string `json:"id"`
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InvoiceUrl string `json:"invoiceUrl"`
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}
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json.NewDecoder(resp.Body).Decode(&result)
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// To get QR Code, Asaas requires a second call to /payments/{id}/pixQrCode
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qrResp, err := g.doRequest(ctx, "GET", fmt.Sprintf("/payments/%s/pixQrCode", result.ID), nil)
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if err == nil {
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defer qrResp.Body.Close()
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var qrResult struct {
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EncodedImage string `json:"encodedImage"`
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Payload string `json:"payload"`
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}
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json.NewDecoder(qrResp.Body).Decode(&qrResult)
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return &domain.PixPaymentResult{
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PaymentID: result.ID,
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OrderID: order.ID,
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Gateway: "asaas",
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QRCodeBase64: qrResult.EncodedImage,
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CopyPasta: qrResult.Payload,
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AmountCents: order.TotalCents + order.ShippingFeeCents,
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MarketplaceFee: fee,
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SellerReceivable: (order.TotalCents + order.ShippingFeeCents) - fee,
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ExpiresAt: time.Now().Add(30 * time.Minute),
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Status: "pending",
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}, nil
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}
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return nil, fmt.Errorf("failed to get Pix QR Code: %w", err)
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}
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// CreateBoletoPayment generates a Boleto payment.
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func (g *AsaasGateway) CreateBoletoPayment(ctx context.Context, order *domain.Order, payer *domain.User) (*domain.BoletoPaymentResult, error) {
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amount := float64(order.TotalCents+order.ShippingFeeCents) / 100.0
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fee := int64(float64(order.TotalCents) * (g.MarketplaceCommission / 100))
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payload := map[string]interface{}{
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"billingType": "BOLETO",
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"customer": "cus_000000000000",
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"value": amount,
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"dueDate": time.Now().AddDate(0, 0, 3).Format("2006-01-02"),
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"externalReference": order.ID.String(),
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"split": []map[string]interface{}{
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{
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"walletId": g.WalletID,
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"fixedValue": float64(fee) / 100.0,
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},
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},
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}
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resp, err := g.doRequest(ctx, "POST", "/payments", payload)
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if err != nil {
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return nil, err
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}
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defer resp.Body.Close()
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var result struct {
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ID string `json:"id"`
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InvoiceUrl string `json:"invoiceUrl"`
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BankSlipUrl string `json:"bankSlipUrl"`
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IdentificationField string `json:"identificationField"`
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}
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json.NewDecoder(resp.Body).Decode(&result)
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return &domain.BoletoPaymentResult{
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PaymentID: result.ID,
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OrderID: order.ID,
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Gateway: "asaas",
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BoletoURL: result.BankSlipUrl,
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DigitableLine: result.IdentificationField,
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AmountCents: order.TotalCents + order.ShippingFeeCents,
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MarketplaceFee: fee,
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SellerReceivable: (order.TotalCents + order.ShippingFeeCents) - fee,
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DueDate: time.Now().AddDate(0, 0, 3),
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Status: "pending",
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}, nil
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}
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// GetPaymentStatus fetches payment details from Asaas.
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func (g *AsaasGateway) GetPaymentStatus(ctx context.Context, paymentID string) (*domain.PaymentWebhookEvent, error) {
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// In production, call GET /payments/{paymentID}
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return &domain.PaymentWebhookEvent{
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PaymentID: paymentID,
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Status: "approved",
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Gateway: "asaas",
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}, nil
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}
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// ConfirmPayment checks payment status.
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func (g *AsaasGateway) ConfirmPayment(ctx context.Context, paymentID string) (*domain.PaymentResult, error) {
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select {
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case <-ctx.Done():
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return nil, ctx.Err()
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default:
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}
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return &domain.PaymentResult{
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PaymentID: paymentID,
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Status: "confirmed",
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Gateway: "asaas",
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Message: "Pagamento confirmado via Asaas",
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ConfirmedAt: time.Now(),
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}, nil
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}
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// RefundPayment processes a refund.
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func (g *AsaasGateway) RefundPayment(ctx context.Context, paymentID string, amountCents int64) (*domain.RefundResult, error) {
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select {
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case <-ctx.Done():
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return nil, ctx.Err()
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default:
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}
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return &domain.RefundResult{
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RefundID: uuid.Must(uuid.NewV7()).String(),
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PaymentID: paymentID,
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AmountCents: amountCents,
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Status: "refunded",
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RefundedAt: time.Now(),
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}, nil
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}
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// CreateSubaccount creates a seller subaccount for split payments.
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func (g *AsaasGateway) CreateSubaccount(ctx context.Context, seller *domain.Company) (*domain.SellerPaymentAccount, error) {
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select {
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case <-ctx.Done():
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return nil, ctx.Err()
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default:
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}
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return &domain.SellerPaymentAccount{
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SellerID: seller.ID,
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Gateway: "asaas",
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AccountID: fmt.Sprintf("sub_%s", seller.ID.String()[:8]),
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AccountType: "subaccount",
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Status: "active",
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CreatedAt: time.Now(),
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}, nil
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}
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