all: implement type for Clearing callback

The ClearingCallbackResponse contains fields that must be set in order
to response from ClearingTransfer callback.

1 files changed, 78 insertions, 0 deletions

diff --git a/clearing_callback.go b/clearing_callback.go
new file mode 100644
index 0000000..721ce25
--- /dev/null
+++ b/clearing_callback.go
@@ -0,0 +1,78 @@
+package duitku
+
+import (
+	"bytes"
+	"crypto/sha256"
+	"encoding/hex"
+	"fmt"
+)
+
+// List of callback status code.
+const (
+	CallbackCodeSuccess = `00`
+	CallbackCodeFail    = `01`
+)
+
+// ClearingCallbackResponse contains fields that must be set in order to
+// response from ClearingTransfer callback.
+//
+// The signature created using the following formula:
+//
+//	SHA256(email + bankCode + bankAccount + accountName +
+//		custRefNumber + amountTransfer + disburseId + secretKey)
+type ClearingCallbackResponse struct {
+	AccountName   string `json:"accountName"`
+	BankAccount   string `json:"bankAccount"`
+	BankCode      string `json:"bankCode"`
+	CustRefNumber string `json:"custRefNumber"`
+	Email         string `json:"email"`
+
+	ErrorMsg   string `json:"errorMessage"`
+	StatusCode string `json:"statusCode"`
+	StatusDesc string `json:"statusDesc"`
+
+	Signature string `json:"signature"`
+
+	Amount     int64 `json:"amountTransfer"`
+	DisburseID int64 `json:"disburseId"`
+	UserID     int64 `json:"userId"`
+}
+
+// NewClearingCallbackResponse create ClearingCallbackResponse from
+// Clearing Transfer response.
+//
+// The StatusCode is set to success initially.
+func NewClearingCallbackResponse(transferRes ClearingTransferResponse) (cbres *ClearingCallbackResponse) {
+	cbres = &ClearingCallbackResponse{
+		AccountName:   transferRes.AccountName,
+		BankAccount:   transferRes.BankAccount,
+		BankCode:      transferRes.BankCode,
+		CustRefNumber: transferRes.CustRefNumber,
+
+		StatusCode: CallbackCodeSuccess,
+
+		Amount:     transferRes.Amount.Int64(),
+		DisburseID: transferRes.DisburseID,
+	}
+	return cbres
+}
+
+// Sign set the Signature SHA256 and convert to hex.
+func (cbres *ClearingCallbackResponse) Sign(opts ClientOptions) {
+	var (
+		bb        bytes.Buffer
+		plainHash [sha256.Size]byte
+	)
+
+	bb.WriteString(cbres.Email)
+	bb.WriteString(cbres.BankCode)
+	bb.WriteString(cbres.BankAccount)
+	bb.WriteString(cbres.AccountName)
+	bb.WriteString(cbres.CustRefNumber)
+	fmt.Fprintf(&bb, `%d%d`, cbres.Amount, cbres.DisburseID)
+	bb.WriteString(opts.ApiKey)
+
+	plainHash = sha256.Sum256(bb.Bytes())
+
+	cbres.Signature = hex.EncodeToString(plainHash[:])
+}