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stk.go
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stk.go
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package stk
import (
"bytes"
"context"
"database/sql"
"encoding/base64"
"encoding/json"
"errors"
"fmt"
"io"
"net/http"
"strings"
"time"
auth "github.com/gidyon/gomicro/pkg/grpc/auth"
"github.com/gidyon/gomicro/utils/errs"
"github.com/gidyon/mpesapayments/pkg/utils/formatutil"
"github.com/gidyon/mpesapayments/pkg/utils/httputils"
stk "github.com/gidyon/mpesastk/pkg/api/stk/v1"
redis "github.com/go-redis/redis/v8"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/grpclog"
"google.golang.org/grpc/status"
"google.golang.org/protobuf/proto"
"google.golang.org/protobuf/types/known/emptypb"
"gorm.io/gorm"
)
// HTTPClient makes mocking test easier
type HTTPClient interface {
Do(*http.Request) (*http.Response, error)
}
type stkAPIServer struct {
stk.UnsafeStkPushV1Server
*Options
}
// Options contain parameters passed for creating stk service
type Options struct {
SQLDB *gorm.DB
RedisDB *redis.Client
Logger grpclog.LoggerV2
AuthAPI *auth.API
OptionSTK *OptionSTK
HTTPClient HTTPClient
UpdateAccessTokenDuration time.Duration
// PublishChannel string
}
// ValidateOptions validates options required by stk service
func ValidateOptions(opt *Options) error {
var err error
switch {
case opt == nil:
err = errs.MissingField("options")
case opt.SQLDB == nil:
err = errs.MissingField("sql db")
case opt.RedisDB == nil:
err = errs.MissingField("redis db")
case opt.Logger == nil:
err = errs.MissingField("logger")
case opt.AuthAPI == nil:
err = errs.MissingField("auth API")
case opt.HTTPClient == nil:
err = errs.MissingField("http client")
case opt.OptionSTK == nil:
err = errs.MissingField("stk options")
}
return err
}
// OptionSTK contains options for sending push stk
type OptionSTK struct {
AccessTokenURL string
PassKey string
ConsumerKey string
ConsumerSecret string
BusinessShortCode string
AccountReference string
Timestamp string
CallBackURL string
PostURL string
QueryURL string
password string
accessToken string
basicToken string
}
// ValidateOptionSTK validates stk options
func ValidateOptionSTK(opt *OptionSTK) error {
var err error
switch {
case opt == nil:
err = errs.MissingField("stk options")
case opt.AccessTokenURL == "":
err = errs.MissingField("access token url")
case opt.ConsumerKey == "":
err = errs.MissingField("consumer key")
case opt.ConsumerSecret == "":
err = errs.MissingField("consumer secret")
case opt.BusinessShortCode == "":
err = errs.MissingField("business short code")
case opt.AccountReference == "":
err = errs.MissingField("account reference")
case opt.Timestamp == "":
err = errs.MissingField("timestamp")
case opt.PassKey == "":
err = errs.MissingField("pass key")
case opt.CallBackURL == "":
err = errs.MissingField("callback url")
case opt.PostURL == "":
err = errs.MissingField("post url")
case opt.QueryURL == "":
case opt.accessToken == "":
case opt.basicToken == "":
}
return err
}
// NewStkAPI creates a singleton instance of mpesa stk API
func NewStkAPI(ctx context.Context, opt *Options) (_ stk.StkPushV1Server, err error) {
defer func() {
if err != nil {
err = errs.WrapErrorWithMsgFunc("Failed to start STK API service")(err)
}
}()
// Validation
switch {
case ctx == nil:
return nil, errs.MissingField("context")
default:
err = ValidateOptions(opt)
if err != nil {
return nil, err
}
err = ValidateOptionSTK(opt.OptionSTK)
if err != nil {
return nil, err
}
}
// Update Basic Token
opt.OptionSTK.basicToken = base64.StdEncoding.EncodeToString([]byte(
opt.OptionSTK.ConsumerKey + ":" + opt.OptionSTK.ConsumerSecret,
))
// Update Password
opt.OptionSTK.password = base64.StdEncoding.EncodeToString([]byte(
opt.OptionSTK.BusinessShortCode + opt.OptionSTK.PassKey + opt.OptionSTK.Timestamp,
))
// API server
stkAPI := &stkAPIServer{
Options: opt,
}
// Auto migration
if !stkAPI.SQLDB.Migrator().HasTable(&STKTransaction{}) {
err = stkAPI.SQLDB.Migrator().AutoMigrate(&STKTransaction{})
if err != nil {
return nil, err
}
}
dur := time.Minute * 15
if opt.UpdateAccessTokenDuration > 0 {
dur = opt.UpdateAccessTokenDuration
}
// Worker for updating access token
go stkAPI.updateAccessTokenWorker(ctx, dur)
// Worker for updating STK results
// go stkAPI.updateSTKResultsWorker(ctx, time.Minute*5)
return stkAPI, nil
}
// GetMpesaSTKPushKey retrives key storing initiator key
func GetMpesaSTKPushKey(msisdn string) string {
return fmt.Sprintf("stkpush:%s", msisdn)
}
// GetMpesaRequestKey is key that initiates data
func GetMpesaRequestKey(requestId string) string {
return fmt.Sprintf("stk:%s", requestId)
}
func firstVal(A ...string) string {
for _, s := range A {
if s != "" {
return s
}
}
return ""
}
func (stkAPI *stkAPIServer) InitiateSTK(
ctx context.Context, req *stk.InitiateSTKRequest,
) (*stk.InitiateSTKResponse, error) {
// Validation
switch {
case req == nil:
return nil, errs.MissingField("request")
case req.InitiatorId == "":
return nil, errs.MissingField("inititator id")
case req.Phone == "":
return nil, errs.MissingField("phone")
case req.AccountReference == "":
return nil, errs.MissingField("account reference")
case req.Amount <= 0:
return nil, errs.MissingField("amount")
case req.Publish && req.GetPublishMessage().GetChannelName() == "":
return nil, errs.MissingField("publisch channel")
}
var (
phoneNumber = formatutil.FormatPhoneKE(req.Phone)
shortCode = firstVal(req.ShortCode, stkAPI.OptionSTK.BusinessShortCode)
accountRef = firstVal(req.AccountReference, stkAPI.OptionSTK.AccountReference)
pb = &STKRequestBody{
BusinessShortCode: shortCode,
Password: stkAPI.OptionSTK.password,
Timestamp: stkAPI.OptionSTK.Timestamp,
TransactionType: "CustomerPayBillOnline",
Amount: fmt.Sprint(req.Amount),
PartyA: phoneNumber,
PartyB: shortCode,
PhoneNumber: phoneNumber,
CallBackURL: stkAPI.OptionSTK.CallBackURL,
AccountReference: accountRef,
TransactionDesc: firstVal(req.TransactionDesc, "NA"),
}
err error
)
if req.PublishMessage == nil {
req.PublishMessage = &stk.PublishInfo{
Payload: map[string]string{},
}
}
if req.PublishMessage.Payload == nil {
req.PublishMessage.Payload = map[string]string{}
}
req.PublishMessage.Payload["short_code"] = shortCode
// Marshal request
bs, err := json.Marshal(pb)
if err != nil {
return nil, errs.FromJSONMarshal(err, "pb")
}
// Create Mpesa STK request
reqHtpp, err := http.NewRequest(http.MethodPost, stkAPI.OptionSTK.PostURL, bytes.NewReader(bs))
if err != nil {
return nil, errs.WrapMessage(codes.Internal, "failed to create post stk request")
}
// Update headers
reqHtpp.Header.Set("Authorization", fmt.Sprintf("Bearer %s", stkAPI.OptionSTK.accessToken))
reqHtpp.Header.Set("Content-Type", "application/json")
httputils.DumpRequest(reqHtpp, "INITIATE STK REQUEST")
// STK model
db := &STKTransaction{
ID: 0,
InitiatorID: req.InitiatorId,
InitiatorCustomerReference: req.InitiatorCustomerReference,
InitiatorCustomerNames: req.InitiatorCustomerNames,
PhoneNumber: phoneNumber,
Amount: fmt.Sprint(req.Amount),
ShortCode: shortCode,
AccountReference: accountRef,
TransactionDesc: sql.NullString{String: req.TransactionDesc, Valid: true},
StkStatus: sql.NullString{String: stk.StkStatus_STK_REQUEST_SUBMITED.String(), Valid: true},
TransactionTime: sql.NullTime{Valid: true, Time: time.Now().UTC()},
CreatedAt: time.Time{},
}
// Save the request to database
err = stkAPI.SQLDB.Create(db).Error
if err != nil {
stkAPI.Logger.Errorln(err)
return nil, errs.WrapMessage(codes.Internal, "failed to save stk")
}
go func() {
err := func() error {
ctx, cancel := context.WithTimeout(context.Background(), 15*time.Second)
defer cancel()
res, err := stkAPI.HTTPClient.Do(reqHtpp)
if err != nil {
return fmt.Errorf("failed to post stk request to mpesa API: %v", err)
}
httputils.DumpResponse(res, "INITIATE STK RESPONSE")
resData := make(map[string]interface{})
err = json.NewDecoder(res.Body).Decode(&resData)
if err != nil && err != io.EOF {
return fmt.Errorf("failed to decode mpesa response: %v", err)
}
errMsg, ok := resData["errorMessage"]
if ok {
return fmt.Errorf("error happened while sending stk push: %v", errMsg)
}
switch strings.ToLower(res.Header.Get("content-type")) {
case "application/json", "application/json;charset=utf-8":
// The CheckoutRequestID must exist
_, ok := resData["CheckoutRequestID"].(string)
if !ok {
return errors.New("stk request failed: missing CheckoutRequestID")
}
// Update STK
err = stkAPI.SQLDB.Model(db).Updates(&STKTransaction{
MerchantRequestID: sql.NullString{String: fmt.Sprint(resData["MerchantRequestID"]), Valid: fmt.Sprint(resData["MerchantRequestID"]) != ""},
CheckoutRequestID: sql.NullString{String: fmt.Sprint(resData["CheckoutRequestID"]), Valid: fmt.Sprint(resData["CheckoutRequestID"]) != ""},
StkResponseDescription: sql.NullString{String: fmt.Sprint(resData["ResponseDescription"]), Valid: fmt.Sprint(resData["ResponseDescription"]) != ""},
StkResponseCustomerMessage: sql.NullString{String: fmt.Sprint(resData["CustomerMessage"]), Valid: fmt.Sprint(resData["CustomerMessage"]) != ""},
StkResponseCode: sql.NullString{String: fmt.Sprint(resData["ResponseCode"]), Valid: fmt.Sprint(resData["ResponseCode"]) != ""},
StkStatus: sql.NullString{String: stk.StkStatus_STK_REQUEST_SUCCESS.String(), Valid: true},
Succeeded: "NO",
Processed: "NO",
TransactionTime: sql.NullTime{Valid: true, Time: time.Now().UTC()},
CreatedAt: time.Time{},
}).Error
if err != nil {
stkAPI.Logger.Errorln(err)
return errors.New("failed to update stk payload")
}
// Marshal request
bs, err := proto.Marshal(req)
if err != nil {
return fmt.Errorf("failed to proto marshal initiate stk request: %v", err)
}
requestId := GetMpesaRequestKey(fmt.Sprint(resData["CheckoutRequestID"]))
// Save request to cache
err = stkAPI.RedisDB.Set(ctx, requestId, bs, time.Minute*15).Err()
if err != nil {
return fmt.Errorf("failed to set initiate stk request to cache: %v", err)
}
default:
return errors.New("incorrect response while initiating STK")
}
return nil
}()
if err != nil {
// Update status to failed
err = stkAPI.SQLDB.Model(db).Updates(&STKTransaction{
StkResponseDescription: sql.NullString{String: err.Error(), Valid: true},
StkStatus: sql.NullString{String: stk.StkStatus_STK_REQUEST_FAILED.String(), Valid: true},
Succeeded: "NO",
Processed: "NO",
TransactionTime: sql.NullTime{Valid: true, Time: time.Now().UTC()},
CreatedAt: time.Time{},
}).Error
if err != nil {
stkAPI.Logger.Errorln(err)
}
}
}()
return &stk.InitiateSTKResponse{
Progress: true,
Message: "Processing. Stk popup will come shortly",
}, nil
}
func (stkAPI *stkAPIServer) GetStkTransaction(
ctx context.Context, req *stk.GetStkTransactionRequest,
) (*stk.StkTransaction, error) {
var err error
// Validation
var key int
switch {
case req == nil:
return nil, errs.MissingField("request")
case req.TransactionId == 0 && req.MpesaReceiptId == "":
return nil, errs.MissingField("transaction/mpesa id")
}
db := &STKTransaction{}
if req.TransactionId != 0 {
err = stkAPI.SQLDB.First(db, "id=?", key).Error
} else if req.MpesaReceiptId != "" {
err = stkAPI.SQLDB.First(db, "mpesa_receipt_id=?", req.MpesaReceiptId).Error
}
switch {
case err == nil:
case errors.Is(err, gorm.ErrRecordNotFound):
return nil, status.Errorf(codes.NotFound, "stk transaction with id %d does not exist", req.TransactionId)
default:
stkAPI.Logger.Errorln(err)
return nil, errs.WrapMessage(codes.Internal, "failed to get stk transaction")
}
return ToProto(db)
}
const defaultPageSize = 100
func userAllowedPhonesSet(userkey string) string {
return fmt.Sprintf("stk:user:%s:allowedphones", userkey)
}
func (stkAPI *stkAPIServer) ListStkTransactions(
ctx context.Context, req *stk.ListStkTransactionsRequest,
) (*stk.ListStkTransactionsResponse, error) {
// Authorization
actor, err := stkAPI.AuthAPI.GetPayload(ctx)
if err != nil {
return nil, err
}
// Validation
switch {
case req == nil:
return nil, errs.MissingField("list request")
case req.PageSize < 0:
return nil, errs.IncorrectVal("page size")
}
// Read from redis list of phone numbers
var allowedPhones []string
allowedPhones, err = stkAPI.RedisDB.SMembers(
ctx, userAllowedPhonesSet(actor.ID),
).Result()
if err != nil && !errors.Is(err, redis.Nil) {
stkAPI.Logger.Errorln(err)
return nil, errs.WrapMessage(codes.Internal, "request failed")
}
pageSize := req.GetPageSize()
switch {
case pageSize <= 0:
pageSize = defaultPageSize
case pageSize > defaultPageSize:
if !stkAPI.AuthAPI.IsAdmin(actor.Group) {
pageSize = defaultPageSize
}
}
var key string
pageToken := req.GetPageToken()
if pageToken != "" {
bs, err := base64.StdEncoding.DecodeString(req.GetPageToken())
if err != nil {
return nil, errs.WrapErrorWithCodeAndMsg(codes.InvalidArgument, err, "failed to parse page token")
}
key = string(bs)
}
dbs := make([]*STKTransaction, 0, pageSize+1)
db := stkAPI.SQLDB.Model(&STKTransaction{}).Limit(int(pageSize) + 1)
if key != "" {
switch req.GetFilter().GetOrderField() {
case stk.StkOrderField_CREATE_TIMESTAMP:
db = db.Where("id<?", key).Order("id DESC")
case stk.StkOrderField_TRANSACTION_TIMESTAMP:
db = db.Where("transaction_time<?", key).Order("transaction_time DESC")
}
} else {
switch req.GetFilter().GetOrderField() {
case stk.StkOrderField_CREATE_TIMESTAMP:
db = db.Order("id DESC")
case stk.StkOrderField_TRANSACTION_TIMESTAMP:
db = db.Order("transaction_time DESC")
}
}
if len(allowedPhones) > 0 {
db = db.Where("phone_number IN(?)", allowedPhones)
}
// Apply filters
if req.Filter != nil {
startTimestamp := req.Filter.GetStartTimestamp()
endTimestamp := req.Filter.GetEndTimestamp()
// Timestamp filter
if endTimestamp > startTimestamp {
switch req.GetFilter().GetOrderField() {
case stk.StkOrderField_CREATE_TIMESTAMP:
db = db.Where("created_at BETWEEN ? AND ?", time.Unix(startTimestamp, 0), time.Unix(endTimestamp, 0))
case stk.StkOrderField_TRANSACTION_TIMESTAMP:
db = db.Where("transaction_time BETWEEN ? AND ?", time.Unix(startTimestamp, 0), time.Unix(endTimestamp, 0))
}
} else if req.Filter.TxDate != "" {
// Date filter
t, err := getTime(req.Filter.TxDate)
if err != nil {
return nil, err
}
switch req.GetFilter().GetOrderField() {
case stk.StkOrderField_CREATE_TIMESTAMP:
db = db.Where("created_at BETWEEN ? AND ?", t, t.Add(time.Hour*24))
case stk.StkOrderField_TRANSACTION_TIMESTAMP:
db = db.Where("transaction_time BETWEEN ? AND ?", t, t.Add(time.Hour*24))
}
}
if len(req.Filter.Msisdns) > 0 {
db = db.Where("phone_number IN(?)", req.Filter.Msisdns)
}
if len(req.Filter.MpesaReceipts) > 0 {
db = db.Where("mpesa_receipt_id IN(?)", req.Filter.MpesaReceipts)
}
if len(req.Filter.InitiatorCustomerReferences) > 0 {
db = db.Where("initiator_customer_reference IN(?)", req.Filter.InitiatorCustomerReferences)
}
if len(req.Filter.InitiatorTransactionReferences) > 0 {
db = db.Where("initiator_transaction_reference IN(?)", req.Filter.InitiatorTransactionReferences)
}
if len(req.Filter.ShortCodes) > 0 {
db = db.Where("short_code IN(?)", req.Filter.ShortCodes)
}
if len(req.Filter.StkStatuses) > 0 {
ss := make([]string, 0, len(req.Filter.StkStatuses))
for _, s := range req.Filter.StkStatuses {
ss = append(ss, s.String())
}
db = db.Where("stk_status IN(?)", ss)
}
switch req.Filter.ProcessState {
case stk.StkProcessedState_STK_PROCESS_STATE_UNSPECIFIED:
case stk.StkProcessedState_STK_NOT_PROCESSED:
db = db.Where("processed=?", "NO")
case stk.StkProcessedState_STK_PROCESSED:
db = db.Where("processed=?", "YES")
}
}
var collectionCount int64
if pageToken == "" && req.View == stk.ListStkTransactionsView_BASIC_VIEW {
err = db.Count(&collectionCount).Error
if err != nil {
stkAPI.Logger.Errorln(err)
return nil, errs.WrapMessage(codes.Internal, "request failed")
}
}
err = db.Find(&dbs).Error
switch {
case err == nil:
default:
stkAPI.Logger.Errorln(err)
return nil, errs.WrapMessage(codes.Internal, "request failed")
}
pbs := make([]*stk.StkTransaction, 0, len(dbs))
for i, db := range dbs {
pb, err := ToProto(db)
if err != nil {
return nil, err
}
if i == int(pageSize) {
break
}
pbs = append(pbs, pb)
switch req.GetFilter().GetOrderField() {
case stk.StkOrderField_CREATE_TIMESTAMP:
key = fmt.Sprint(db.ID)
case stk.StkOrderField_TRANSACTION_TIMESTAMP:
key = db.TransactionTime.Time.UTC().Format(time.RFC3339)
}
}
var token string
if len(dbs) > int(pageSize) {
// Next page token
token = base64.StdEncoding.EncodeToString([]byte(fmt.Sprint(key)))
}
return &stk.ListStkTransactionsResponse{
NextPageToken: token,
StkTransactions: pbs,
CollectionCount: collectionCount,
}, nil
}
func getTime(dateStr string) (time.Time, error) {
// 2020y 08m 16d 20h 41m 16s
// "2006-01-02T15:04:05Z07:00"
timeRFC3339Str := fmt.Sprintf("%sT00:00:00Z", dateStr)
t, err := time.Parse(time.RFC3339, timeRFC3339Str)
if err != nil {
return time.Time{}, errs.WrapErrorWithCodeAndMsg(codes.InvalidArgument, err, "failed to parse date to time")
}
return t, nil
}
func (stkAPI *stkAPIServer) ProcessStkTransaction(
ctx context.Context, req *stk.ProcessStkTransactionRequest,
) (*emptypb.Empty, error) {
// Authorization
_, err := stkAPI.AuthAPI.AuthorizeGroups(ctx, stkAPI.AuthAPI.AdminGroups()...)
if err != nil {
return nil, err
}
// Validation
var key int
switch {
case req == nil:
return nil, errs.MissingField("process request")
case req.TransactionId == 0 && req.MpesaReceiptId == "":
return nil, errs.MissingField("transaction/mpesa id")
}
processed := "NO"
if req.Processed {
processed = "YES"
}
if req.TransactionId != 0 {
err = stkAPI.SQLDB.Model(&STKTransaction{}).Unscoped().Where("id=?", key).
Update("processed", processed).Error
} else {
err = stkAPI.SQLDB.Model(&STKTransaction{}).Unscoped().Where("mpesa_receipt_id=?", req.MpesaReceiptId).
Update("processed", processed).Error
}
switch {
case err == nil:
default:
stkAPI.Logger.Errorln(err)
return nil, errs.WrapMessage(codes.Internal, "failed to process stk transaction")
}
return &emptypb.Empty{}, nil
}
func (stkAPI *stkAPIServer) PublishStkTransaction(
ctx context.Context, req *stk.PublishStkTransactionRequest,
) (*emptypb.Empty, error) {
// Authorization
_, err := stkAPI.AuthAPI.AuthorizeGroups(ctx, stkAPI.AuthAPI.AdminGroups()...)
if err != nil {
return nil, err
}
// Validation
switch {
case req == nil:
return nil, errs.MissingField("publish request")
case req.PublishMessage == nil:
return nil, errs.MissingField("publish message")
}
pb := req.GetPublishMessage().GetTransactionInfo()
// Marshal data
bs, err := proto.Marshal(req.PublishMessage)
if err != nil {
return nil, errs.FromProtoMarshal(err, "publish message")
}
channel := req.GetPublishMessage().GetPublishInfo().GetChannelName()
if channel == "" {
return &emptypb.Empty{}, nil
}
// Publish based on state
switch req.ProcessedState {
case stk.StkProcessedState_STK_PROCESS_STATE_UNSPECIFIED:
err = stkAPI.RedisDB.Publish(ctx, channel, bs).Err()
if err != nil {
stkAPI.Logger.Errorln(err)
return nil, errs.WrapMessage(codes.Internal, "request failed")
}
case stk.StkProcessedState_STK_PROCESSED:
// Publish only if the processed state is true
if pb.GetProcessed() {
err = stkAPI.RedisDB.Publish(ctx, channel, bs).Err()
if err != nil {
stkAPI.Logger.Errorln(err)
return nil, errs.WrapMessage(codes.Internal, "request failed")
}
}
case stk.StkProcessedState_STK_NOT_PROCESSED:
// Publish only if the processed state is false
if !pb.GetProcessed() {
err = stkAPI.RedisDB.Publish(ctx, channel, bs).Err()
if err != nil {
stkAPI.Logger.Errorln(err)
return nil, errs.WrapMessage(codes.Internal, "request failed")
}
}
}
return &emptypb.Empty{}, nil
}