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functions.go
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functions.go
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package goccavenue
import (
"bytes"
"crypto/aes"
"crypto/cipher"
"crypto/md5"
"encoding/hex"
"fmt"
"strings"
)
func escapeStr(str string) string {
// return url.QueryEscape(str)
return str
}
// Sets the merchant id
func SetMerchantId(merchantId string) {
ccAvenueMerchantId = merchantId
}
// Gets the merchant id
func GetMerchantId() (merchantId string) {
return ccAvenueMerchantId
}
// Sets the encryption key
func SetEncryptionKey(encryptionKey string) {
ccAvenueEncryptionKey = encryptionKey
}
// Gets the encryption key
func GetEncryptionKey() (encryptionKey string) {
return ccAvenueEncryptionKey
}
// Creates the payload string in a format acceptable to CCAvenue prior to encryption
func CreateRequest(paymentReq CCAvenueRequest) string {
var stringsToEncode = []string{
fmt.Sprintf("merchant_id=%s", escapeStr(paymentReq.MerchantId)),
fmt.Sprintf("order_id=%s", escapeStr(paymentReq.OrderId)),
fmt.Sprintf("currency=%s", escapeStr(paymentReq.Currency)),
fmt.Sprintf("amount=%s", escapeStr(paymentReq.Amount)),
fmt.Sprintf("redirect_url=%s", escapeStr(paymentReq.RedirectUrl)),
fmt.Sprintf("cancel_url=%s", escapeStr(paymentReq.CancelUrl)),
fmt.Sprintf("language=%s", escapeStr(paymentReq.Language)),
fmt.Sprintf("billing_name=%s", escapeStr(paymentReq.BillingName)),
fmt.Sprintf("billing_address=%s", escapeStr(paymentReq.BillingAddress)),
fmt.Sprintf("billing_city=%s", escapeStr(paymentReq.BillingCity)),
fmt.Sprintf("billing_state=%s", escapeStr(paymentReq.BillingState)),
fmt.Sprintf("billing_zip=%s", escapeStr(paymentReq.BillingZip)),
fmt.Sprintf("billing_country=%s", escapeStr(paymentReq.BillingCountry)),
fmt.Sprintf("billing_tel=%s", escapeStr(paymentReq.BillingTel)),
fmt.Sprintf("billing_email=%s", escapeStr(paymentReq.BillingEmail)),
fmt.Sprintf("delivery_name=%s", escapeStr(paymentReq.DeliveryName)),
fmt.Sprintf("delivery_address=%s", escapeStr(paymentReq.DeliveryAddress)),
fmt.Sprintf("delivery_city=%s", escapeStr(paymentReq.DeliveryCity)),
fmt.Sprintf("delivery_state=%s", escapeStr(paymentReq.DeliveryState)),
fmt.Sprintf("delivery_zip=%s", escapeStr(paymentReq.DeliveryZip)),
fmt.Sprintf("delivery_country=%s", escapeStr(paymentReq.DeliveryCountry)),
fmt.Sprintf("delivery_tel=%s", escapeStr(paymentReq.DeliveryTel)),
fmt.Sprintf("merchant_param1=%s", escapeStr(paymentReq.MerchantParam1)),
fmt.Sprintf("merchant_param2=%s", escapeStr(paymentReq.MerchantParam2)),
fmt.Sprintf("merchant_param3=%s", escapeStr(paymentReq.MerchantParam3)),
fmt.Sprintf("merchant_param4=%s", escapeStr(paymentReq.MerchantParam4)),
fmt.Sprintf("merchant_param5=%s", escapeStr(paymentReq.MerchantParam5)),
fmt.Sprintf("integration_type=%s", escapeStr(paymentReq.IntegrationType)),
fmt.Sprintf("promo_code=%s", escapeStr(paymentReq.PromoCode)),
fmt.Sprintf("customer_identifier=%s", escapeStr(paymentReq.CustomerIdentifier)),
fmt.Sprintf("merchant_id=%s", paymentReq.MerchantId),
}
return strings.Join(stringsToEncode, "&")
}
// Creates the response payload from the already decrypted string
func CreateResponseFromDecryptedText(decryptedString string) (response CCAvenueResponse, err error) {
var resp = CCAvenueResponse{}
// Create a map
var dict = make(map[string]string)
listOfValues := strings.Split(decryptedString, "&")
for _, combined := range listOfValues {
split := strings.Split(combined, "=")
if len(split) != 2 {
continue
}
key := split[0]
value := split[1]
dict[key] = value
}
// Assign the values here
resp.OrderId = dict["order_id"]
resp.TrackingId = dict["tracking_id"]
resp.BankRefNo = dict["bank_ref_no"]
resp.OrderStatus = strToOrderStatus(dict["order_status"])
resp.FailureMessage = dict["failure_message"]
resp.PaymentMode = dict["payment_mode"]
resp.CardName = dict["card_name"]
resp.StatusCode = dict["status_code"]
resp.StatusMessage = dict["status_message"]
resp.Currency = dict["currency"]
resp.Amount = dict["amount"]
resp.BillingName = dict["billing_name"]
resp.BillingAddress = dict["billing_address"]
resp.BillingCity = dict["billing_city"]
resp.BillingState = dict["billing_state"]
resp.BillingZip = dict["billing_zip"]
resp.BillingCountry = dict["billing_country"]
resp.BillingTel = dict["billing_tel"]
resp.BillingEmail = dict["billing_email"]
resp.DeliveryName = dict["delivery_name"]
resp.DeliveryAddress = dict["delivery_address"]
resp.DeliveryCity = dict["delivery_city"]
resp.DeliveryState = dict["delivery_state"]
resp.DeliveryZip = dict["delivery_zip"]
resp.DeliveryCountry = dict["delivery_country"]
resp.DeliveryTel = dict["delivery_tel"]
resp.MerchantParam1 = dict["merchant_param1"]
resp.MerchantParam2 = dict["merchant_param2"]
resp.MerchantParam3 = dict["merchant_param3"]
resp.MerchantParam4 = dict["merchant_param4"]
resp.MerchantParam5 = dict["merchant_param5"]
resp.Vault = dict["vault"]
resp.OfferType = dict["offer_type"]
resp.OfferCode = dict["offer_code"]
resp.DiscountValue = dict["discount_value"]
resp.MerchantAmount = dict["mer_amount"]
resp.ECIValue = dict["eci_value"]
resp.Retry = dict["retry"]
resp.ResponseCode = dict["response_code"]
resp.BillingNotes = dict["billing_notes"]
resp.TransactionDate = dict["trans_date"]
resp.BinCountry = dict["bin_country"]
return resp, nil
}
// Creates the response payload from the given encrypted string from CCAvenue
func CreateResponseFromEncryptedText(encryptedResponse string) (response CCAvenueResponse, err error) {
if strings.HasPrefix(encryptedResponse, "encResp=") {
encryptedResponse = strings.Split(encryptedResponse, "encResp=")[1]
}
decryptedString, err := DecryptPayload(encryptedResponse)
if err != nil {
return CCAvenueResponse{}, err
}
return CreateResponseFromDecryptedText(decryptedString)
}
// Pads the cipher text so that the length is a multiple of the block size (as per CCAvenue's requirement)
func padPayload(ciphertext string) (paddedString string) {
padding := (ccAvenueBlockSize - len(ciphertext)%ccAvenueBlockSize)
padtext := bytes.Repeat([]byte{byte(padding)}, padding)
return ciphertext + string(padtext)
}
// Encrypts plain text string into cipher text string that is recognized by CCAvenue
func EncryptPayload(paymentReq CCAvenueRequest) (string, error) {
hash := md5.Sum([]byte(GetEncryptionKey()))
key := hash[:]
plainText := padPayload(CreateRequest(paymentReq))
block, err := aes.NewCipher(key)
if err != nil {
return "", err
}
cipherText := make([]byte, len(plainText))
mode := cipher.NewCBCEncrypter(block, ccAvenueInitializationVector)
mode.CryptBlocks(cipherText, []byte(plainText))
return hex.EncodeToString(cipherText), err
}
// Decrypts cipher text string into plain text string
func DecryptPayload(cipherText string) (decryptedString string, err error) {
hash := md5.Sum([]byte(GetEncryptionKey()))
key := hash[:]
cipherTextDecoded, err := hex.DecodeString(cipherText)
if err != nil {
return "", err
}
block, err := aes.NewCipher(key)
if err != nil {
return "", err
}
paddedBytes := make([]byte, len(cipherTextDecoded))
mode := cipher.NewCBCDecrypter(block, ccAvenueInitializationVector)
mode.CryptBlocks(paddedBytes, cipherTextDecoded)
paddingLen := paddedBytes[len(paddedBytes)-1]
if paddingLen < ccAvenueBlockSize {
// Message has been padded, so trim the last n bytes
paddedBytes = paddedBytes[:len(paddedBytes)-int(paddingLen)]
}
plainText := string(paddedBytes)
return plainText, nil
}