callback.go

package tripay

import (
	"crypto/hmac"
	"crypto/sha256"
	"encoding/hex"
	"encoding/json"
)

type Callback struct {
	Reference      string `json:"reference"`
	MerchantRef    string `json:"merchant_ref"`
	PaymentMethod  PaymentChannelCode `json:"payment_method_code"`
	PaymentName    string `json:"payment_method"`
	CustomerName   string `json:"customer_name"`
	CustomerEmail  string `json:"customer_email"`
	CustomerPhone  string `json:"customer_phone"`
	CallbackUrl    string `json:"callback_url"`
	ReturnUrl      string `json:"return_url"`
	Amount         int    `json:"total_amount"`
	MerchantFee    int    `json:"fee_merchant"`
	CustomerFee    int    `json:"fee_customer"`
	TotalFee       int    `json:"total_fee"`
	AmountReceived int    `json:"amount_received"`
	//0 = open payment. 1 = closed payment
	PaymentType PaymentType `json:"is_closed_payment"`
	Status      string      `json:"status"`
	PaidAt      int         `json:"paid_at"`
	Note        string      `json:"note"`
}

func (t *Tripay) CallbackSignature(callbackData Callback) (signature string, err error) {
	h := hmac.New(sha256.New, t.ApiKey)
	b, err := json.Marshal(&callbackData)
	if err != nil{
		return "",err
	}
	h.Write(b)
	signature = hex.EncodeToString(h.Sum(nil))
	return signature, nil
}

func (t *Tripay) CompareSignature(signature1, signature2 string) bool {
	sign1, _ :=hex.DecodeString(signature1)
	sign2, _ :=hex.DecodeString(signature2)
	return hmac.Equal(sign1, sign2)
}