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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,87 @@ | ||
| package hmacvalidator | ||
|
|
||
| import ( | ||
| "crypto/hmac" | ||
| "crypto/sha256" | ||
| "encoding/base64" | ||
| "encoding/hex" | ||
| "fmt" | ||
| "regexp" | ||
| "sort" | ||
| "strconv" | ||
| "strings" | ||
|
|
||
| "github.com/adyen/adyen-go-api-library/src/notification" | ||
| ) | ||
|
|
||
| // CalculateHmac calculates the SHA-256 HMAC for the given data and key | ||
| func CalculateHmac(data interface{}, secret string) (string, error) { | ||
| switch val := data.(type) { | ||
| case string: | ||
| return encode(val, secret) | ||
| default: | ||
| src := GetDataToSign(data) | ||
| return encode(src, secret) | ||
| } | ||
| } | ||
|
|
||
| // ValidateHmac calculates the HMAC of the notification request item and checks if it matches with the given key | ||
| func ValidateHmac(notificationRequestItem notification.NotificationRequestItem, key string) bool { | ||
| expectedSign, err := CalculateHmac(notificationRequestItem, key) | ||
| if err != nil { | ||
| return false | ||
| } | ||
| merchantSign := (*notificationRequestItem.AdditionalData)["HmacSignature"] | ||
| return expectedSign == merchantSign | ||
| } | ||
|
|
||
| // GetDataToSign converts a notification request item to string, which later on can be used for calculating a HMAC | ||
| func GetDataToSign(notificationRequestItem interface{}) string { | ||
| switch item := notificationRequestItem.(type) { | ||
| case notification.NotificationRequestItem: | ||
| signedDataList := []string{ | ||
| item.PspReference, | ||
| item.OriginalReference, | ||
| item.MerchantAccountCode, | ||
| item.MerchantReference, | ||
| strconv.Itoa(int(item.Amount.Value)), | ||
| item.Amount.Currency, | ||
| item.EventCode, | ||
| item.Success, | ||
| } | ||
| return strings.Join(signedDataList, ":") | ||
| case map[string]string: | ||
| keys := make([]string, 0) | ||
| values := make([]string, 0) | ||
|
|
||
| for k := range item { | ||
| keys = append(keys, replacer(k)) | ||
| } | ||
| sort.Strings(keys) | ||
| for _, k := range keys { | ||
| values = append(values, replacer(item[k])) | ||
| } | ||
|
|
||
| return strings.Join(keys, ":") + ":" + strings.Join(values, ":") | ||
| default: | ||
| return "" | ||
| } | ||
| } | ||
|
|
||
| func encode(data string, secret string) (string, error) { | ||
| key, err := hex.DecodeString(secret) | ||
| if err != nil { | ||
| return "", fmt.Errorf("failed to generate HMAC: %s", err.Error()) | ||
| } | ||
| h := hmac.New(sha256.New, key) | ||
| h.Write([]byte(data)) | ||
| return base64.StdEncoding.EncodeToString(h.Sum(nil)), nil | ||
| } | ||
|
|
||
| func replacer(s string) string { | ||
| re1 := regexp.MustCompile(`\\`) | ||
| re2 := regexp.MustCompile(`:`) | ||
| str := re1.ReplaceAllString(s, "\\\\") | ||
| str = re2.ReplaceAllString(str, "\\:") | ||
| return str | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,71 @@ | ||
| package hmacvalidator | ||
|
|
||
| import ( | ||
| "testing" | ||
| "time" | ||
|
|
||
| "github.com/adyen/adyen-go-api-library/src/notification" | ||
| "github.com/stretchr/testify/assert" | ||
| ) | ||
|
|
||
| const key = "DFB1EB5485895CFA84146406857104ABB4CBCABDC8AAF103A624C8F6A3EAAB00" | ||
| const expectedSign = "ipnxGCaUZ4l8TUW75a71/ghd2Fe5ffvX0pV4TLTntIc=" | ||
|
|
||
| var eventDate = time.Date(1970, time.January, 01, 0, 0, 0, 0, time.UTC) | ||
| var notificationRequestItem = notification.NotificationRequestItem{ | ||
| AdditionalData: &map[string]interface{}{"HmacSignature": expectedSign}, | ||
| Amount: notification.Amount{ | ||
| Currency: "EUR", | ||
| Value: 1000, | ||
| }, | ||
| EventCode: "EVENT", | ||
| EventDate: &eventDate, | ||
| MerchantAccountCode: "merchantAccount", | ||
| MerchantReference: "reference", | ||
| OriginalReference: "originalReference", | ||
| PaymentMethod: "VISA", | ||
| PspReference: "pspReference", | ||
| Reason: "reason", | ||
| Success: "true", | ||
| } | ||
|
|
||
| func Test_Hmacvalidator(t *testing.T) { | ||
| t.Run("GetDataToSign", func(t *testing.T) { | ||
| t.Run("Get correct data", func(t *testing.T) { | ||
| data := map[string]string{"MerchantAccount": "ACC", "CurrencyCode": "EUR"} | ||
| dataToSign := GetDataToSign(data) | ||
| assert.Equal(t, "CurrencyCode:MerchantAccount:EUR:ACC", dataToSign) | ||
| }) | ||
| t.Run("Get correct data with escaped characters", func(t *testing.T) { | ||
| data := map[string]string{"CurrencyCode": "EUR", "MerchantAccount": "ACC:\\", "SessionValidity": "2019-09-21T11:45:24.637Z"} | ||
| dataToSign := GetDataToSign(data) | ||
| assert.Equal(t, "CurrencyCode:MerchantAccount:SessionValidity:EUR:ACC\\:\\\\:2019-09-21T11\\:45\\:24.637Z", dataToSign) | ||
| }) | ||
| t.Run("Get correct data to sign", func(t *testing.T) { | ||
| data := GetDataToSign(notificationRequestItem) | ||
| assert.Equal(t, "pspReference:originalReference:merchantAccount:reference:1000:EUR:EVENT:true", data) | ||
| }) | ||
| }) | ||
| t.Run("CalculateHmac", func(t *testing.T) { | ||
| t.Run("Encrypt correctly", func(t *testing.T) { | ||
| data := "countryCode:currencyCode:merchantAccount:merchantReference:paymentAmount:sessionValidity:skinCode:NL:EUR:MagentoMerchantTest2:TEST-PAYMENT-2017-02-01-14\\:02\\:05:199:2017-02-02T14\\:02\\:05+01\\:00:PKz2KML1" | ||
| encrypted, err := CalculateHmac(data, key) | ||
| assert.Nil(t, err) | ||
| assert.Equal(t, "34oR8T1whkQWTv9P+SzKyp8zhusf9n0dpqrm9nsqSJs=", encrypted) | ||
| }) | ||
| t.Run("Get Valid HMAC", func(t *testing.T) { | ||
| enc, err := CalculateHmac(notificationRequestItem, key) | ||
| assert.Nil(t, err) | ||
| assert.Equal(t, expectedSign, enc) | ||
| }) | ||
| }) | ||
| t.Run("ValidateHmac", func(t *testing.T) { | ||
| t.Run("Validate HMAC", func(t *testing.T) { | ||
| assert.True(t, ValidateHmac(notificationRequestItem, key)) | ||
| }) | ||
| t.Run("Get Invalid HMAC", func(t *testing.T) { | ||
| notificationRequestItem.AdditionalData = &map[string]interface{}{"HmacSignature": "InvalidSignature"} | ||
| assert.False(t, ValidateHmac(notificationRequestItem, key)) | ||
| }) | ||
| }) | ||
| } |
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