all: split the merchant into DefaultMerchant and PaymentMerchant

The PaymentMerchant will be used if the payment method during inquiry
exist as the key in it; otherwise it will use DefaultMerchant

5 files changed, 162 insertions, 27 deletions

diff --git a/client_options.go b/client_options.go
index b365ac0..fa6ad1c 100644
--- a/client_options.go
+++ b/client_options.go
@@ -18,30 +18,12 @@ type ClientOptions struct {
 	// The hostname extracted from ServerUrl.
 	host string
 
-	// The merchant code is the project code obtained from the Duitku
-	// merchant page.
-	// This code is useful as an identifier of your project in each
-	// request using the /merchant/* APIs.
-	// You can get this code on every project you register on the
-	// [merchant portal].
-	//
-	// [merchant portal]: https://passport.duitku.com/merchant/Project
-	MerchantCode string `ini:"duitku::merchant_code"`
+	// DefaultMerchant default merchant to be used for payment.
+	DefaultMerchant Merchant `ini:"default-merchant"`
 
-	// MerchantApiKey The API key for signing merchant related request.
-	MerchantApiKey string `ini:"duitku::merchant_api_key"`
-
-	// MerchantCallbackUrl The URL that will be used by Duitku to
-	// confirm payments made by your customers.
-	MerchantCallbackUrl string `ini:"duitku::merchant_callback_url"`
-
-	// MerchantReturnUrl The URL that Duitku will direct the customer
-	// after the transaction is successful or canceled.
-	MerchantReturnUrl string `ini:"duitku::merchant_return_url"`
-
-	// Merchant code and API key for payment through Indomaret.
-	IndomaretMerchantCode string `ini:"duitku::indomaret_merchant_code"`
-	IndomaretApiKey       string `ini:"duitku::indomaret_api_key"`
+	// PaymentMerchant specific merchant to be used based on payment
+	// method.
+	PaymentMerchant map[string]Merchant `ini:"merchant"`
 
 	// DisburseApiKey API key for signing disbursement request.
 	DisburseApiKey string `ini:"duitku::disburse_api_key"`
@@ -74,8 +56,23 @@ func LoadClientOptions(file string) (opts *ClientOptions, err error) {
 	return opts, nil
 }
 
-// validate each field values.
-func (opts *ClientOptions) validate() (err error) {
+// Merchant return the PaymentMerchant based on paymentMethod.
+// If no key found, it will return DefaultMerchant.
+func (opts *ClientOptions) Merchant(paymentMethod string) (merchant Merchant) {
+	var (
+		found bool
+	)
+
+	merchant, found = opts.PaymentMerchant[paymentMethod]
+	if !found {
+		merchant = opts.DefaultMerchant
+	}
+
+	return merchant
+}
+
+// initAndValidate each field values.
+func (opts *ClientOptions) initAndValidate() (err error) {
 	var (
 		urlServer *url.URL
 	)
@@ -96,5 +93,19 @@ func (opts *ClientOptions) validate() (err error) {
 		return fmt.Errorf(`invalid or empty DisburseApiKey: %s`, opts.DisburseApiKey)
 	}
 
+	var (
+		method   string
+		merchant Merchant
+	)
+	for method, merchant = range opts.PaymentMerchant {
+		if len(merchant.CallbackUrl) == 0 {
+			merchant.CallbackUrl = opts.DefaultMerchant.CallbackUrl
+		}
+		if len(merchant.ReturnUrl) == 0 {
+			merchant.ReturnUrl = opts.DefaultMerchant.ReturnUrl
+		}
+		opts.PaymentMerchant[method] = merchant
+	}
+
 	return nil
 }
diff --git a/client_options_test.go b/client_options_test.go
new file mode 100644
index 0000000..0d865f3
--- /dev/null
+++ b/client_options_test.go
@@ -0,0 +1,56 @@
+// SPDX-FileCopyrightText: 2023 M. Shulhan <ms@kilabit.info>
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+package duitku
+
+import (
+	"encoding/json"
+	"testing"
+
+	"github.com/shuLhan/share/lib/ini"
+	"github.com/shuLhan/share/lib/test"
+)
+
+func TestLoadClientOptions(t *testing.T) {
+	var (
+		tdata *test.Data
+		err   error
+	)
+
+	tdata, err = test.LoadData(`testdata/client_options_test.txt`)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	var (
+		opts ClientOptions
+		tag  string
+		data []byte
+	)
+
+	data = tdata.Input[`all.conf`]
+
+	err = ini.Unmarshal(data, &opts)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = opts.initAndValidate()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	var (
+		exp []byte
+		got []byte
+	)
+
+	got, err = json.MarshalIndent(&opts, ``, `  `)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	tag = `all.json`
+	exp = tdata.Output[tag]
+	test.Assert(t, tag, string(exp), string(got))
+}
diff --git a/merchant.go b/merchant.go
new file mode 100644
index 0000000..7d7d2c5
--- /dev/null
+++ b/merchant.go
@@ -0,0 +1,27 @@
+// SPDX-FileCopyrightText: 2023 M. Shulhan <ms@kilabit.info>
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+package duitku
+
+type Merchant struct {
+	// The merchant code is the project code obtained from the Duitku
+	// merchant page.
+	// This code is useful as an identifier of your project in each
+	// request using the /merchant/* APIs.
+	// You can get this code on every project you register on the
+	// [merchant portal].
+	//
+	// [merchant portal]: https://passport.duitku.com/merchant/Project
+	Code string `ini:"::code"`
+
+	// The API key for signing merchant request.
+	ApiKey string `ini:"::api_key"`
+
+	// The URL that will be used by Duitku to confirm payments made by
+	// your customers.
+	CallbackUrl string `ini:"::callback_url"`
+
+	// The URL that Duitku will direct the customer after the transaction
+	// is successful or canceled.
+	ReturnUrl string `ini:"::return_url"`
+}
diff --git a/payment_method.go b/payment_method.go
index b5e95fa..9dffcda 100644
--- a/payment_method.go
+++ b/payment_method.go
@@ -45,19 +45,21 @@ func (req *PaymentMethod) SetDateTime(t time.Time) {
 // Signature.
 func (req *PaymentMethod) Sign(opts ClientOptions) {
 	var (
+		merchant = opts.DefaultMerchant
+
 		plain string
 		hash  [sha256.Size]byte
 	)
 
 	if len(req.MerchantCode) == 0 {
-		req.MerchantCode = opts.MerchantCode
+		req.MerchantCode = merchant.Code
 	}
 
 	if len(req.DateTime) == 0 {
 		req.SetDateTime(time.Now())
 	}
 
-	plain = fmt.Sprintf(`%s%d%s%s`, req.MerchantCode, req.Amount, req.DateTime, opts.MerchantApiKey)
+	plain = fmt.Sprintf(`%s%d%s%s`, req.MerchantCode, req.Amount, req.DateTime, merchant.ApiKey)
 	hash = sha256.Sum256([]byte(plain))
 
 	req.Signature = hex.EncodeToString(hash[:])
diff --git a/testdata/client_options_test.txt b/testdata/client_options_test.txt
new file mode 100644
index 0000000..5d4d34e
--- /dev/null
+++ b/testdata/client_options_test.txt
@@ -0,0 +1,39 @@
+>>> all.conf
+[duitku]
+server_url = https://sandbox.duitku.com
+disburse_user_id = 1111
+disburse_email = my@company.com
+disburse_api_key = abcd
+
+[default-merchant]
+code = DXXXX
+api_key = d3f4ult
+callback_url = https://example.com/callback
+return_url = https://example.com/payment
+
+## Payment using Indomaret use this merchant.
+[merchant "IR"]
+code = DYYYY
+api_key = 1ndom4r3t
+
+<<< all.json
+{
+  "ServerUrl": "https://sandbox.duitku.com",
+  "DefaultMerchant": {
+    "Code": "DXXXX",
+    "ApiKey": "d3f4ult",
+    "CallbackUrl": "https://example.com/callback",
+    "ReturnUrl": "https://example.com/payment"
+  },
+  "PaymentMerchant": {
+    "IR": {
+      "Code": "DYYYY",
+      "ApiKey": "1ndom4r3t",
+      "CallbackUrl": "https://example.com/callback",
+      "ReturnUrl": "https://example.com/payment"
+    }
+  },
+  "DisburseApiKey": "abcd",
+  "DisburseEmail": "my@company.com",
+  "DisburseUserID": 1111
+}