wip: add transfer auithorization

internal/custodial/abis.go

@@ -3,6 +3,7 @@ package custodial
 import "github.com/grassrootseconomics/w3-celo-patch"
 
 const (
+	Approve      = "approve"
 	Check        = "check"
 	GiveTo       = "giveTo"
 	MintTo       = "mintTo"
@@ -16,12 +17,12 @@ const (
 // Any relevant function signature that will be used by the custodial system can be defined here.
 func initAbis() map[string]*w3.Func {
 	return map[string]*w3.Func{
+		Approve:  w3.MustNewFunc("approve(address, uint256)", "bool"),
 		Check:    w3.MustNewFunc("check(address)", "bool"),
 		GiveTo:   w3.MustNewFunc("giveTo(address)", "uint256"),
 		MintTo:   w3.MustNewFunc("mintTo(address, uint256)", "bool"),
 		NextTime: w3.MustNewFunc("nextTime(address)", "uint256"),
 		Register: w3.MustNewFunc("register(address)", ""),
 		Transfer: w3.MustNewFunc("transfer(address,uint256)", "bool"),
-		TransferFrom: w3.MustNewFunc("transferFrom(address, address, uint256)", "bool"),
 	}
 }

internal/tasker/task/sign_transfer.go

@@ -66,7 +66,10 @@ func SignTransfer(cu *custodial.Custodial) func(context.Context, *asynq.Task) er
 			}
 		}()
 
-		input, err := cu.Abis[custodial.Transfer].EncodeArgs(celoutils.HexToAddress(payload.To), new(big.Int).SetUint64(payload.Amount))
+		input, err := cu.Abis[custodial.Transfer].EncodeArgs(
+			celoutils.HexToAddress(payload.To),
+			new(big.Int).SetUint64(payload.Amount),
+		)
 		if err != nil {
 			return err
 		}

internal/tasker/task/sign_transfer_auth.go

@@ -0,0 +1,127 @@
+package task
+
+import (
+	"context"
+	"encoding/json"
+	"math/big"
+
+	"github.com/bsm/redislock"
+	"github.com/celo-org/celo-blockchain/common/hexutil"
+	"github.com/grassrootseconomics/celoutils"
+	"github.com/grassrootseconomics/cic-custodial/internal/custodial"
+	"github.com/grassrootseconomics/cic-custodial/internal/store"
+	"github.com/grassrootseconomics/cic-custodial/internal/tasker"
+	"github.com/grassrootseconomics/cic-custodial/pkg/enum"
+	"github.com/hibiken/asynq"
+)
+
+type TransferAuthPayload struct {
+	AuthorizedAddress string `json:"authorizedAddress"`
+	AuthorizedAmount  uint64 `json:"authorizedAmount"`
+	TrackingId        string `json:"trackingId"`
+	VoucherAddress    string `json:"voucherAddress"`
+}
+
+func SignTransferAuthorizationProcessor(cu *custodial.Custodial) func(context.Context, *asynq.Task) error {
+	return func(ctx context.Context, t *asynq.Task) error {
+		var (
+			err     error
+			payload TransferAuthPayload
+		)
+
+		if err := json.Unmarshal(t.Payload(), &payload); err != nil {
+			return err
+		}
+
+		lock, err := cu.LockProvider.Obtain(
+			ctx,
+			lockPrefix+cu.SystemPublicKey,
+			lockTimeout,
+			&redislock.Options{
+				RetryStrategy: lockRetry(),
+			},
+		)
+		if err != nil {
+			return err
+		}
+		defer lock.Release(ctx)
+
+		nonce, err := cu.Noncestore.Acquire(ctx, cu.SystemPublicKey)
+		if err != nil {
+			return err
+		}
+		defer func() {
+			if err != nil {
+				if nErr := cu.Noncestore.Return(ctx, cu.SystemPublicKey); nErr != nil {
+					err = nErr
+				}
+			}
+		}()
+
+		input, err := cu.Abis[custodial.Approve].EncodeArgs(
+			celoutils.HexToAddress(payload.AuthorizedAddress),
+			new(big.Int).SetUint64(payload.AuthorizedAmount),
+		)
+		if err != nil {
+			return err
+		}
+
+		builtTx, err := cu.CeloProvider.SignContractExecutionTx(
+			cu.SystemPrivateKey,
+			celoutils.ContractExecutionTxOpts{
+				ContractAddress: celoutils.HexToAddress(payload.VoucherAddress),
+				InputData:       input,
+				GasFeeCap:       celoutils.SafeGasFeeCap,
+				GasTipCap:       celoutils.SafeGasTipCap,
+				GasLimit:        uint64(celoutils.SafeGasLimit),
+				Nonce:           nonce,
+			},
+		)
+		if err != nil {
+			return err
+		}
+
+		rawTx, err := builtTx.MarshalBinary()
+		if err != nil {
+			return err
+		}
+
+		id, err := cu.Store.CreateOtx(ctx, store.Otx{
+			TrackingId:    payload.TrackingId,
+			Type:          enum.TRANSFER_AUTH,
+			RawTx:         hexutil.Encode(rawTx),
+			TxHash:        builtTx.Hash().Hex(),
+			From:          cu.SystemPublicKey,
+			Data:          hexutil.Encode(builtTx.Data()),
+			GasPrice:      builtTx.GasPrice(),
+			GasLimit:      builtTx.Gas(),
+			TransferValue: 0,
+			Nonce:         builtTx.Nonce(),
+		})
+		if err != nil {
+			return err
+		}
+
+		disptachJobPayload, err := json.Marshal(TxPayload{
+			OtxId: id,
+			Tx:    builtTx,
+		})
+		if err != nil {
+			return err
+		}
+
+		_, err = cu.TaskerClient.CreateTask(
+			ctx,
+			tasker.DispatchTxTask,
+			tasker.HighPriority,
+			&tasker.Task{
+				Payload: disptachJobPayload,
+			},
+		)
+		if err != nil {
+			return err
+		}
+
+		return nil
+	}
+}

migrations/006_transfer_auth.sql

@@ -0,0 +1 @@
+INSERT INTO otx_tx_type (value) VALUES ('TRANSFER_AUTHORIZATION');

pkg/enum/enum.go

@@ -21,5 +21,6 @@ const (
 
 	ACCOUNT_REGISTER OtxType = "ACCOUNT_REGISTER"
 	REFILL_GAS       OtxType = "REFILL_GAS"
+	TRANSFER_AUTH    OtxType = "TRANFSER_AUTHORIZATION"
 	TRANSFER_VOUCHER OtxType = "TRANSFER_VOUCHER"
 )