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request_handler_payment.go
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request_handler_payment.go
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package handlers
import (
"encoding/hex"
"encoding/json"
log "github.com/sirupsen/logrus"
"io/ioutil"
"net/http"
"strconv"
"github.com/stellar/go/address"
b "github.com/stellar/go/build"
"github.com/stellar/go/clients/horizon"
"github.com/stellar/go/protocols/compliance"
"github.com/stellar/go/protocols/federation"
shared "github.com/stellar/go/services/internal/bridge-compliance-shared"
"github.com/stellar/go/services/internal/bridge-compliance-shared/http/helpers"
"github.com/stellar/go/services/internal/bridge-compliance-shared/protocols/bridge"
callback "github.com/stellar/go/services/internal/bridge-compliance-shared/protocols/compliance"
"github.com/stellar/go/xdr"
)
// Payment implements /payment endpoint
func (rh *RequestHandler) Payment(w http.ResponseWriter, r *http.Request) {
request := &bridge.PaymentRequest{}
err := helpers.FromRequest(r, request)
if err != nil {
log.Error(err.Error())
helpers.Write(w, helpers.InvalidParameterError)
return
}
err = helpers.Validate(request, rh.Config.Accounts.BaseSeed)
if err != nil {
switch err := err.(type) {
case *helpers.ErrorResponse:
helpers.Write(w, err)
default:
log.Error(err)
helpers.Write(w, helpers.InternalServerError)
}
return
}
if request.Source == "" {
request.Source = rh.Config.Accounts.BaseSeed
}
// Will use compliance if compliance server is connected and:
// * User passed extra memo OR
// * User explicitly wants to use compliance protocol
if rh.Config.Compliance != "" &&
(request.ExtraMemo != "" || (request.ExtraMemo == "" && request.UseCompliance)) {
rh.complianceProtocolPayment(w, request)
} else {
rh.standardPayment(w, request)
}
}
func (rh *RequestHandler) complianceProtocolPayment(w http.ResponseWriter, request *bridge.PaymentRequest) {
var paymentID *string
if request.ID != "" {
paymentID = &request.ID
}
// Compliance server part
sendRequest := request.ToComplianceSendRequest()
resp, err := rh.Client.PostForm(
rh.Config.Compliance+"/send",
helpers.ToValues(sendRequest),
)
if err != nil {
log.WithFields(log.Fields{"err": err}).Error("Error sending request to compliance server")
helpers.Write(w, helpers.InternalServerError)
return
}
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
log.Error("Error reading compliance server response")
helpers.Write(w, helpers.InternalServerError)
return
}
if resp.StatusCode != 200 {
log.WithFields(log.Fields{
"status": resp.StatusCode,
"body": string(body),
}).Error("Error response from compliance server")
helpers.Write(w, helpers.InternalServerError)
return
}
var callbackSendResponse callback.SendResponse
err = json.Unmarshal(body, &callbackSendResponse)
if err != nil {
log.Error("Error unmarshalling from compliance server")
helpers.Write(w, helpers.InternalServerError)
return
}
if callbackSendResponse.AuthResponse.InfoStatus == compliance.AuthStatusPending ||
callbackSendResponse.AuthResponse.TxStatus == compliance.AuthStatusPending {
log.WithFields(log.Fields{"response": callbackSendResponse}).Info("Compliance response pending")
helpers.Write(w, bridge.NewPaymentPendingError(callbackSendResponse.AuthResponse.Pending))
return
}
if callbackSendResponse.AuthResponse.InfoStatus == compliance.AuthStatusDenied ||
callbackSendResponse.AuthResponse.TxStatus == compliance.AuthStatusDenied {
log.WithFields(log.Fields{"response": callbackSendResponse}).Info("Compliance response denied")
helpers.Write(w, bridge.PaymentDenied)
return
}
var tx xdr.Transaction
err = xdr.SafeUnmarshalBase64(callbackSendResponse.TransactionXdr, &tx)
if err != nil {
log.Error("Error unmarshalling transaction returned by compliance server")
helpers.Write(w, helpers.InternalServerError)
return
}
submitResponse, err := rh.TransactionSubmitter.SignAndSubmitRawTransaction(paymentID, request.Source, &tx)
rh.handleTransactionSubmitResponse(w, submitResponse, err)
}
func (rh *RequestHandler) standardPayment(w http.ResponseWriter, request *bridge.PaymentRequest) {
var paymentID *string
if request.ID != "" {
sentTransaction, err := rh.Database.GetSentTransactionByPaymentID(request.ID)
if err != nil {
log.WithFields(log.Fields{"err": err}).Error("Error getting sent transaction")
helpers.Write(w, helpers.InternalServerError)
return
}
if sentTransaction == nil {
paymentID = &request.ID
} else {
log.WithFields(log.Fields{"paymentID": request.ID, "tx": sentTransaction.EnvelopeXdr}).Info("Transaction with given ID already exists, resubmitting...")
submitResponse, err := rh.Horizon.SubmitTransaction(sentTransaction.EnvelopeXdr)
if err != nil {
log.WithFields(log.Fields{"error": err}).Error("Error submitting transaction")
helpers.Write(w, helpers.InternalServerError)
return
}
rh.handleTransactionSubmitResponse(w, submitResponse, err)
return
}
}
destinationObject := &federation.NameResponse{}
var err error
if request.ForwardDestination == nil {
_, _, err = address.Split(request.Destination)
if err != nil {
destinationObject.AccountID = request.Destination
} else {
destinationObject, err = rh.FederationResolver.LookupByAddress(request.Destination)
if err != nil {
log.WithFields(log.Fields{"destination": request.Destination, "err": err}).Print("Cannot resolve address")
helpers.Write(w, bridge.PaymentCannotResolveDestination)
return
}
}
} else {
destinationObject, err = rh.FederationResolver.ForwardRequest(request.ForwardDestination.Domain, request.ForwardDestination.Fields)
if err != nil {
log.WithFields(log.Fields{"destination": request.Destination, "err": err}).Print("Cannot resolve address")
helpers.Write(w, bridge.PaymentCannotResolveDestination)
return
}
}
if !shared.IsValidAccountID(destinationObject.AccountID) {
log.WithFields(log.Fields{"AccountId": destinationObject.AccountID}).Print("Invalid AccountId in destination")
helpers.Write(w, helpers.NewInvalidParameterError("destination", "Destination public key must start with `G`."))
return
}
var payWithMutator *b.PayWithPath
if request.SendMax != "" {
// Path payment
var sendAsset b.Asset
if request.SendAssetCode == "" && request.SendAssetIssuer == "" {
sendAsset = b.NativeAsset()
} else {
sendAsset = b.CreditAsset(request.SendAssetCode, request.SendAssetIssuer)
}
payWith := b.PayWith(sendAsset, request.SendMax)
for _, asset := range request.Path {
payWith = payWith.Through(asset.ToBaseAsset())
}
payWithMutator = &payWith
}
var operationBuilder interface{}
if request.AssetCode != "" && request.AssetIssuer != "" {
mutators := []interface{}{
b.Destination{destinationObject.AccountID},
b.CreditAmount{request.AssetCode, request.AssetIssuer, request.Amount},
}
if payWithMutator != nil {
mutators = append(mutators, *payWithMutator)
}
operationBuilder = b.Payment(mutators...)
} else {
mutators := []interface{}{
b.Destination{destinationObject.AccountID},
b.NativeAmount{request.Amount},
}
if payWithMutator != nil {
mutators = append(mutators, *payWithMutator)
}
// Check if destination account exist
_, err = rh.Horizon.LoadAccount(destinationObject.AccountID)
if err != nil {
log.WithFields(log.Fields{"error": err}).Error("Error loading account")
operationBuilder = b.CreateAccount(mutators...)
} else {
operationBuilder = b.Payment(mutators...)
}
}
memoType := request.MemoType
memo := request.Memo
if destinationObject.MemoType != "" {
if request.MemoType != "" {
log.Print("Memo given in request but federation returned memo fields.")
helpers.Write(w, bridge.PaymentCannotUseMemo)
return
}
memoType = destinationObject.MemoType
memo = destinationObject.Memo.Value
}
var memoMutator interface{}
switch {
case memoType == "":
break
case memoType == "id":
id, err := strconv.ParseUint(memo, 10, 64)
if err != nil {
log.WithFields(log.Fields{"memo": memo}).Print("Cannot convert memo_id value to uint64")
helpers.Write(w, helpers.NewInvalidParameterError("memo", "Memo.id must be a number"))
return
}
memoMutator = b.MemoID{id}
case memoType == "text":
memoMutator = b.MemoText{memo}
case memoType == "hash":
memoBytes, err := hex.DecodeString(memo)
if err != nil || len(memoBytes) != 32 {
log.WithFields(log.Fields{"memo": memo}).Print("Cannot decode hash memo value")
helpers.Write(w, helpers.NewInvalidParameterError("memo", "Memo.hash must be 32 bytes and hex encoded."))
return
}
var b32 [32]byte
copy(b32[:], memoBytes[0:32])
hash := xdr.Hash(b32)
memoMutator = b.MemoHash{hash}
default:
log.Print("Not supported memo type: ", memoType)
helpers.Write(w, helpers.NewInvalidParameterError("memo", "Memo type not supported"))
return
}
submitResponse, err := rh.TransactionSubmitter.SubmitTransaction(paymentID, request.Source, operationBuilder, memoMutator)
rh.handleTransactionSubmitResponse(w, submitResponse, err)
}
func (rh *RequestHandler) handleTransactionSubmitResponse(w http.ResponseWriter, submitResponse horizon.TransactionSuccess, err error) {
jsonEncoder := json.NewEncoder(w)
if err != nil {
herr, isHorizonError := err.(*horizon.Error)
if !isHorizonError {
log.WithFields(log.Fields{"err": err}).Error("Error submitting transaction")
helpers.Write(w, helpers.InternalServerError)
return
}
w.WriteHeader(herr.Problem.Status)
err := jsonEncoder.Encode(herr.Problem)
if err != nil {
log.WithFields(log.Fields{"err": err}).Error("Error encoding response")
helpers.Write(w, helpers.InternalServerError)
return
}
return
}
err = jsonEncoder.Encode(submitResponse)
if err != nil {
log.WithFields(log.Fields{"err": err}).Error("Error encoding response")
helpers.Write(w, helpers.InternalServerError)
return
}
}