Reorganized code + migration to go1.22
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brajkovic committed
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@@ -0,0 +1,276 @@
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package viva
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import (
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"bytes"
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"encoding/base64"
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"encoding/json"
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"errors"
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"github.com/gin-gonic/gin"
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"github.com/google/uuid"
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"io"
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"log/slog"
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"net/http"
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"net/url"
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database2 "payment-poc/domain/database"
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"payment-poc/domain/state"
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"strconv"
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"time"
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)
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type Service struct {
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ClientId string
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ClientSecret string
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SourceCode string
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MerchantId string
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ApiKey string
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token string
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expiration time.Time
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}
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func (s *Service) UpdatePayment(entry database2.PaymentEntry) (updatedEntry database2.PaymentEntry, err error) {
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token, err := s.oAuthToken()
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httpResponse, err := createRequest(
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"GET",
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"https://demo-api.vivapayments.com/checkout/v2/transactions/"+entry.TransactionId.String(),
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map[string]string{"authorization": "Bearer " + token, "content-type": "application/json"},
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[]byte{},
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)
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if err != nil {
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return database2.PaymentEntry{}, err
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}
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var response TransactionStatusResponse
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err = readResponse(httpResponse, &response)
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if err != nil {
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return database2.PaymentEntry{}, err
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}
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newState := determineStatus(response.StatusId)
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if entry.State != newState && newState != "" {
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slog.Info("updated state", "entry_id", entry.Id.String(), "state", entry.State, "new_state", newState)
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entry.State = newState
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if entry.State == state.StateCompleted {
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amount := int64(response.Amount * 100)
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entry.Amount = &amount
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}
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}
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return entry, nil
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}
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func determineStatus(id TransactionStatus) state.PaymentState {
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switch id {
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case PaymentPreauthorized:
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return state.StateAccepted
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case PaymentPending:
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return state.StatePending
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case PaymentSuccessful:
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return state.StateCompleted
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case PaymentUnsuccessful:
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return state.StateError
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case PaymentRefunded:
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return state.StateVoided
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case PaymentVoided:
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return state.StateVoided
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}
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slog.Info("unknown transaction status", "status", string(id))
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return ""
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}
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func (s *Service) CreatePaymentUrl(entry database2.PaymentEntry) (database2.PaymentEntry, string, error) {
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entry, err := s.InitializePayment(entry)
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if err != nil {
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return entry, "", err
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}
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return entry, "https://demo.vivapayments.com/web/checkout?ref=" + string(*entry.OrderId), nil
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}
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func (s *Service) InitializePayment(entry database2.PaymentEntry) (database2.PaymentEntry, error) {
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token, err := s.oAuthToken()
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if err != nil {
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return database2.PaymentEntry{}, err
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}
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request := OrderRequest{
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Amount: entry.TotalAmount,
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Description: "Example payment",
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MerchantDescription: "Example payment",
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PreAuth: true,
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AllowRecurring: false,
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Source: s.SourceCode,
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}
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httpResponse, err := createRequest(
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"POST",
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"https://demo-api.vivapayments.com/checkout/v2/orders",
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map[string]string{"authorization": "Bearer " + token, "content-type": "application/json"},
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toJson(request),
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)
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if err != nil {
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return database2.PaymentEntry{}, err
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}
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var response OrderResponse
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err = readResponse(httpResponse, &response)
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if err != nil {
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return database2.PaymentEntry{}, err
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}
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entry.State = state.StateInitialized
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entry.OrderId = &response.OrderId
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return entry, nil
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}
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func (s *Service) CompleteTransaction(entry database2.PaymentEntry, amount int64) (database2.PaymentEntry, error) {
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completionRequest := TransactionCompleteRequest{
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Amount: amount,
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CustomerDescription: "Example transaction",
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}
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httpResponse, err := createRequest(
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"POST",
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"https://demo.vivapayments.com/api/transactions/"+entry.TransactionId.String(),
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map[string]string{"authorization": "Basic " + s.basicAuth(),
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"content-type": "application/json",
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},
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toJson(completionRequest),
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)
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if err != nil {
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return database2.PaymentEntry{}, err
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}
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var response TransactionResponse
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err = readResponse(httpResponse, &response)
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if err != nil {
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return database2.PaymentEntry{}, err
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}
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if response.StatusId == "F" {
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paidAmount := response.Amount * 100
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entry.Amount = &paidAmount
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entry.State = state.StateCompleted
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} else {
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return database2.PaymentEntry{}, errors.New("received invalid status = " + response.StatusId)
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}
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return entry, nil
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}
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func (s *Service) CancelTransaction(entry database2.PaymentEntry) (database2.PaymentEntry, error) {
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amount := strconv.FormatInt(entry.TotalAmount, 10)
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httpResponse, err := createRequest(
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"DELETE",
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"https://demo.vivapayments.com/api/transactions/"+entry.TransactionId.String()+"?amount="+amount,
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map[string]string{"authorization": "Basic " + s.basicAuth(),
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"content-type": "application/json",
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},
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nil,
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)
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if err != nil {
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return database2.PaymentEntry{}, err
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}
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var response TransactionResponse
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err = readResponse(httpResponse, &response)
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if err != nil {
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return database2.PaymentEntry{}, err
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}
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if response.StatusId == "F" {
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paidAmount := int64(0)
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entry.Amount = &paidAmount
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entry.State = state.StateVoided
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} else {
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return database2.PaymentEntry{}, errors.New("received invalid status = " + response.StatusId)
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}
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return entry, nil
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}
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func (s *Service) oAuthToken() (string, error) {
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if s.token != "" && s.expiration.After(time.Now()) {
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return s.token, nil
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}
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return s.fetchOAuthToken()
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}
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func readResponse[T any](httpResponse *http.Response, response T) error {
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if httpResponse.StatusCode == http.StatusOK {
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content, err := io.ReadAll(httpResponse.Body)
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if err != nil {
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return err
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}
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return json.Unmarshal(content, response)
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} else {
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return errors.New("received wrong status, expected 200 received " + strconv.FormatInt(int64(httpResponse.StatusCode), 10))
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}
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}
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func createRequest(method string, url string, headers map[string]string, content []byte) (*http.Response, error) {
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request, err := http.NewRequest(method, url, bytes.NewReader(content))
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if err != nil {
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return nil, err
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}
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for key, value := range headers {
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request.Header.Add(key, value)
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}
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return http.DefaultClient.Do(request)
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}
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func toJson[T any](request T) []byte {
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response, err := json.Marshal(request)
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if err != nil {
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panic(err)
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}
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return response
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}
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func (s *Service) fetchOAuthToken() (string, error) {
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form := url.Values{
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"grant_type": []string{"client_credentials"},
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}
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httpResponse, err := createRequest(
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"POST",
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"https://demo-accounts.vivapayments.com/connect/token",
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map[string]string{"content-type": "application/x-www-form-urlencoded", "authorization": "Basic " + base64.StdEncoding.EncodeToString([]byte(s.ClientId+":"+s.ClientSecret))},
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[]byte(form.Encode()),
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)
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var response OAuthResponse
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err = readResponse(httpResponse, &response)
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if err != nil {
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return "", err
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}
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s.token = response.AccessToken
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s.expiration = time.Now().Add(time.Duration(response.ExpiresIn) * time.Second)
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return s.token, nil
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}
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func (s *Service) basicAuth() string {
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return base64.StdEncoding.EncodeToString([]byte(s.MerchantId + ":" + s.ApiKey))
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}
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func (s *Service) HandleResponse(c *gin.Context, provider *database2.PaymentEntryProvider, state state.PaymentState) (string, error) {
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transactionId := uuid.MustParse(c.Query("t"))
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orderId := database2.OrderId(c.Query("s"))
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lang := c.Query("lang")
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eventId := c.Query("eventId")
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eci := c.Query("eci")
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slog.Info("received error response from viva payment", "order_id", orderId)
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entry, err := provider.FetchByOrderId(orderId)
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if err != nil {
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slog.Error("couldn't find payment info for viva payment", "order_id", orderId)
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return "", err
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}
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entry.State = state
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entry.ECI = &eci
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entry.Lang = &lang
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entry.EventId = &eventId
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entry.TransactionId = &transactionId
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if _, err := provider.UpdateEntry(entry); err != nil {
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return "", err
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}
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slog.Info("received authorization response", "entry_id", entry.Id.String(), "state", entry.State)
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return "/entries/" + entry.Id.String(), nil
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}
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@@ -0,0 +1,57 @@
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package viva
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import (
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"payment-poc/domain/database"
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)
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type OrderRequest struct {
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Amount int64 `json:"amount"`
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Description string `json:"customerTrns"`
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MerchantDescription string `json:"merchantTrns"`
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PreAuth bool `json:"preauth"`
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AllowRecurring bool `json:"allowRecurring"`
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Source string `json:"sourceCode"`
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}
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type OrderResponse struct {
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OrderId database.OrderId `json:"orderCode"`
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}
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type OAuthResponse struct {
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AccessToken string `json:"access_token"`
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ExpiresIn int `json:"expires_in"`
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}
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type TransactionCompleteRequest struct {
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Amount int64 `json:"amount"`
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CustomerDescription string `json:"customerTrns"`
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}
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type TransactionResponse struct {
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Amount int64 `json:"Amount"`
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StatusId string `json:"StatusId"`
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ErrorCode int64 `json:"ErrorCode"`
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ErrorText string `json:"ErrorText"`
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EventId int64 `json:"EventId"`
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Success bool `json:"Success"`
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}
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type TransactionStatus string
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const (
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PaymentSuccessful TransactionStatus = "C"
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PaymentPending TransactionStatus = "A"
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PaymentPreauthorized TransactionStatus = "F"
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PaymentUnsuccessful TransactionStatus = "E"
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PaymentRefunded TransactionStatus = "R"
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PaymentVoided TransactionStatus = "X"
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)
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type TransactionStatusResponse struct {
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Email string `json:"email"`
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Amount float64 `json:"amount"`
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OrderCode database.OrderId `json:"orderCode"`
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StatusId TransactionStatus `json:"statusId"`
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FullName string `json:"fullName"`
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CardNumber string `json:"cardNumber"`
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}
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