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package main
import (
"bytes"
"crypto/hmac"
"crypto/sha512"
"encoding/base64"
"errors"
"fmt"
"io"
"strconv"
"strings"
"time"
"unicode/utf8"
)
const WALLEE_AUTH_HEADER_VERSION = "x-mac-version"
const WALLEE_AUTH_HEADER_USERID = "x-mac-userid"
const WALLEE_AUTH_HEADER_TIMESTAMP = "x-mac-timestamp"
const WALLEE_AUTH_HEADER_MAC = "x-mac-value"
const WALLEE_READ_TRANSACTION_API = "/api/transaction/read"
const WALLEE_CREATE_REFUND_API = "/api/refund/refund"
const WALLEE_API_SPACEID_PARAM_NAME = "spaceId"
type WalleeCredentials struct {
SpaceId int `json:"spaceId"`
UserId int `json:"userId"`
ApplicationUserKey string `json:"application-user-key"`
}
type WalleeClient struct {
ProviderClient
name string
baseUrl string
credentials *WalleeCredentials
}
func (wt *WalleeTransaction) AllowWithdrawal() bool {
return strings.EqualFold(string(wt.State), string(StateFulfill))
}
func (wt *WalleeTransaction) AbortWithdrawal() bool {
// guaranteed abortion is given when the state of
// the transaction is a final state but not the
// success case (which is FULFILL)
return strings.EqualFold(string(wt.State), string(StateFailed)) ||
strings.EqualFold(string(wt.State), string(StateVoided)) ||
strings.EqualFold(string(wt.State), string(StateDecline))
}
func (wt *WalleeTransaction) FormatPayto() string {
return fmt.Sprintf("payto://wallee-transaction/%d", wt.ID)
}
func (wt *WalleeTransaction) Bytes() []byte {
reader, err := NewJsonCodec[WalleeTransaction]().Encode(wt)
if err != nil {
LogError("wallee-client", err)
return make([]byte, 0)
}
bytes, err := io.ReadAll(reader)
if err != nil {
LogError("wallee-client", err)
return make([]byte, 0)
}
return bytes
}
func (w *WalleeClient) SetupClient(p *Provider) error {
cfg, err := ConfigForProvider(p.Name)
if err != nil {
return err
}
creds, err := parseCredentials(p.BackendCredentials, cfg)
if err != nil {
return err
}
w.name = p.Name
w.baseUrl = p.BackendBaseURL
w.credentials = creds
PROVIDER_CLIENTS[w.name] = w
return nil
}
func (w *WalleeClient) GetTransaction(transactionId string) (ProviderTransaction, error) {
call := WALLEE_READ_TRANSACTION_API
queryParams := map[string]string{
WALLEE_API_SPACEID_PARAM_NAME: strconv.Itoa(w.credentials.SpaceId),
"id": transactionId,
}
url := FormatUrl(call, map[string]string{}, queryParams)
hdrs, err := w.prepareWalleeHeaders(url, HTTP_GET)
if err != nil {
return nil, err
}
t, status, err := HttpGet(url, hdrs, NewJsonCodec[WalleeTransaction]())
if err != nil {
return nil, err
}
if status != HTTP_OK {
return nil, errors.New("no result")
}
return t, nil
}
func (sc *WalleeClient) FormatPayto(w *Withdrawal) string {
return fmt.Sprintf("payto://wallee-transaction/%s", *w.ProviderTransactionId)
}
func (w *WalleeClient) Refund(transactionId string) error {
call := WALLEE_CREATE_REFUND_API
queryParams := map[string]string{
WALLEE_API_SPACEID_PARAM_NAME: strconv.Itoa(w.credentials.SpaceId),
}
url := FormatUrl(call, map[string]string{}, queryParams)
hdrs, err := w.prepareWalleeHeaders(url, HTTP_GET)
if err != nil {
return err
}
// TODO generate refund object. needs Completion and Transaction IDs
refund := &WalleeRefund{
Amount: 10,
Completion: 10,
ExternalID: "",
MerchantReference: "",
Reductions: []WalleeLineItemReduction{},
Transaction: 10,
Type: "",
}
_, status, err := HttpPost[WalleeRefund, any](url, hdrs, refund, NewJsonCodec[WalleeRefund](), nil)
if err != nil {
LogError("wallee-client", err)
return err
}
if status != HTTP_OK {
return errors.New("no result")
}
return nil
}
func (w *WalleeClient) prepareWalleeHeaders(url string, method string) (map[string]string, error) {
timestamp := time.Time.Unix(time.Now())
base64Mac, err := calculateWalleeAuthToken(
w.credentials.UserId,
timestamp,
method,
url,
w.credentials.ApplicationUserKey,
)
if err != nil {
return nil, err
}
headers := map[string]string{
WALLEE_AUTH_HEADER_VERSION: "1",
WALLEE_AUTH_HEADER_USERID: strconv.Itoa(w.credentials.UserId),
WALLEE_AUTH_HEADER_TIMESTAMP: strconv.Itoa(int(timestamp)),
WALLEE_AUTH_HEADER_MAC: base64Mac,
}
return headers, nil
}
func parseCredentials(raw string, cfg *C2ECProviderConfig) (*WalleeCredentials, error) {
credsJson := make([]byte, len(raw))
_, err := base64.StdEncoding.Decode(credsJson, []byte(raw))
if err != nil {
return nil, err
}
creds, err := NewJsonCodec[WalleeCredentials]().Decode(bytes.NewBuffer(credsJson))
if err != nil {
return nil, err
}
if !ValidPassword(cfg.CredentialsPassword, creds.ApplicationUserKey) {
return nil, errors.New("invalid application user key")
}
// correct application user key.
creds.ApplicationUserKey = cfg.CredentialsPassword
return creds, nil
}
// This function calculates the authentication token according
// to the documentation of wallee:
// https://app-wallee.com/en-us/doc/api/web-service#_authentication
// the function returns the token in Base64 format.
func calculateWalleeAuthToken(
userId int,
unixTimestamp int64,
httpMethod string,
pathWithParams string,
userKeyBase64 string,
) (string, error) {
// Put together the correct formatted string
// Version | UserId | Timestamp | Method | Path
authMsgStr := fmt.Sprintf("%d|%d|%d|%s|%s",
1, // version is static
userId,
unixTimestamp,
httpMethod,
pathWithParams,
)
authMsg := make([]byte, 0)
if valid := utf8.ValidString(authMsgStr); !valid {
// encode the string using utf8
for _, r := range authMsgStr {
rbytes := make([]byte, 4)
utf8.EncodeRune(rbytes, r)
authMsg = append(authMsg, rbytes...)
}
}
key := make([]byte, base64.StdEncoding.DecodedLen(len(userKeyBase64)))
_, err := base64.StdEncoding.Decode(key, []byte(userKeyBase64))
if err != nil {
LogError("wallee-client", err)
return "", err
}
if len(key) != 32 {
return "", errors.New("malformed secret")
}
macer := hmac.New(sha512.New, key)
_, err = macer.Write(authMsg)
if err != nil {
LogError("wallee-client", err)
return "", err
}
mac := make([]byte, 64)
mac = macer.Sum(mac)
return base64.StdEncoding.EncodeToString(mac), nil
}
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