chore: add crypto payment

2026-03-18 18:41:07 +01:00
parent a82097a228
commit adf68201fd
12 changed files with 788 additions and 2 deletions
@@ -0,0 +1,182 @@
+package services
+
+import (
+	"bytes"
+	"crypto/hmac"
+	"crypto/sha512"
+	"encoding/hex"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"sort"
+	"time"
+)
+
+var httpClient = &http.Client{Timeout: 30 * time.Second}
+
+type NowPaymentsClient struct {
+	APIKey    string
+	IPNSecret string
+	BaseURL   string
+}
+
+func NewNowPaymentsClient(apiKey, ipnSecret string) *NowPaymentsClient {
+	return &NowPaymentsClient{
+		APIKey:    apiKey,
+		IPNSecret: ipnSecret,
+		BaseURL:   "https://api.nowpayments.io/v1",
+	}
+}
+
+type CreatePaymentRequest struct {
+	PriceAmount    float64 `json:"price_amount"`
+	PriceCurrency  string  `json:"price_currency"`
+	PayCurrency    string  `json:"pay_currency"`
+	OrderID        string  `json:"order_id"`
+	IPNCallbackURL string  `json:"ipn_callback_url"`
+}
+
+type CreatePaymentResponse struct {
+	PaymentID     json.Number `json:"payment_id"`
+	PayAddress    string      `json:"pay_address"`
+	PayAmount     json.Number `json:"pay_amount"`
+	PayCurrency   string      `json:"pay_currency"`
+	PriceAmount   json.Number `json:"price_amount"`
+	PriceCurrency string      `json:"price_currency"`
+	Status        string      `json:"payment_status"`
+	OrderID       string      `json:"order_id"`
+}
+
+type IPNPayload struct {
+	PaymentID     json.Number `json:"payment_id"`
+	PaymentStatus string      `json:"payment_status"`
+	PayAddress    string      `json:"pay_address"`
+	PriceAmount   json.Number `json:"price_amount"`
+	PriceCurrency string      `json:"price_currency"`
+	PayAmount     json.Number `json:"pay_amount"`
+	PayCurrency   string      `json:"pay_currency"`
+	OrderID       string      `json:"order_id"`
+}
+
+func (c *NowPaymentsClient) CreatePayment(req *CreatePaymentRequest) (*CreatePaymentResponse, error) {
+	body, err := json.Marshal(req)
+	if err != nil {
+		return nil, fmt.Errorf("failed to marshal request: %w", err)
+	}
+
+	httpReq, err := http.NewRequest("POST", c.BaseURL+"/payment", bytes.NewBuffer(body))
+	if err != nil {
+		return nil, fmt.Errorf("failed to create request: %w", err)
+	}
+
+	httpReq.Header.Set("x-api-key", c.APIKey)
+	httpReq.Header.Set("Content-Type", "application/json")
+
+	resp, err := httpClient.Do(httpReq)
+	if err != nil {
+		return nil, fmt.Errorf("failed to send request: %w", err)
+	}
+	defer resp.Body.Close()
+
+	respBody, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read response: %w", err)
+	}
+
+	if resp.StatusCode != http.StatusCreated && resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("nowpayments error (%d): %s", resp.StatusCode, string(respBody))
+	}
+
+	var result CreatePaymentResponse
+	if err := json.Unmarshal(respBody, &result); err != nil {
+		return nil, fmt.Errorf("failed to parse response: %w", err)
+	}
+
+	return &result, nil
+}
+
+type GetPaymentStatusResponse struct {
+	PaymentID     json.Number `json:"payment_id"`
+	PaymentStatus string      `json:"payment_status"`
+	PayAddress    string      `json:"pay_address"`
+	PriceAmount   json.Number `json:"price_amount"`
+	PriceCurrency string      `json:"price_currency"`
+	PayAmount     json.Number `json:"pay_amount"`
+	ActuallyPaid  json.Number `json:"actually_paid"`
+	PayCurrency   string      `json:"pay_currency"`
+	OrderID       string      `json:"order_id"`
+}
+
+func (c *NowPaymentsClient) GetPaymentStatus(paymentID string) (*GetPaymentStatusResponse, error) {
+	httpReq, err := http.NewRequest("GET", c.BaseURL+"/payment/"+paymentID, nil)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create request: %w", err)
+	}
+
+	httpReq.Header.Set("x-api-key", c.APIKey)
+
+	resp, err := httpClient.Do(httpReq)
+	if err != nil {
+		return nil, fmt.Errorf("failed to send request: %w", err)
+	}
+	defer resp.Body.Close()
+
+	respBody, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read response: %w", err)
+	}
+
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("nowpayments error (%d): %s", resp.StatusCode, string(respBody))
+	}
+
+	var result GetPaymentStatusResponse
+	if err := json.Unmarshal(respBody, &result); err != nil {
+		return nil, fmt.Errorf("failed to parse response: %w", err)
+	}
+
+	return &result, nil
+}
+
+func (c *NowPaymentsClient) VerifyIPN(body []byte, signature string) bool {
+	if c.IPNSecret == "" || signature == "" {
+		return false
+	}
+
+	var payload map[string]interface{}
+	if err := json.Unmarshal(body, &payload); err != nil {
+		return false
+	}
+
+	sorted := sortedJSON(payload)
+
+	mac := hmac.New(sha512.New, []byte(c.IPNSecret))
+	mac.Write(sorted)
+	expected := hex.EncodeToString(mac.Sum(nil))
+
+	return hmac.Equal([]byte(expected), []byte(signature))
+}
+
+func sortedJSON(data map[string]interface{}) []byte {
+	keys := make([]string, 0, len(data))
+	for k := range data {
+		keys = append(keys, k)
+	}
+	sort.Strings(keys)
+
+	ordered := make([]byte, 0, 256)
+	ordered = append(ordered, '{')
+	for i, k := range keys {
+		if i > 0 {
+			ordered = append(ordered, ',')
+		}
+		key, _ := json.Marshal(k)
+		val, _ := json.Marshal(data[k])
+		ordered = append(ordered, key...)
+		ordered = append(ordered, ':')
+		ordered = append(ordered, val...)
+	}
+	ordered = append(ordered, '}')
+	return ordered
+}