Channel

channel/backend.go

@@ -0,0 +1,54 @@
+package channel
+
+import (
+	"crypto/sha256"
+	"perun.network/go-perun/channel"
+	"perun.network/go-perun/wallet"
+	"perun.network/perun-stellar-backend/channel/types"
+	"perun.network/perun-stellar-backend/wire"
+)
+
+type backend struct{}
+
+var Backend = backend{}
+
+func init() {
+	channel.SetBackend(Backend)
+}
+
+func (b backend) CalcID(params *channel.Params) channel.ID {
+	wp := wire.MustMakeParams(*params)
+	bytes, err := wp.MarshalBinary()
+	if err != nil {
+		panic(err)
+	}
+	return sha256.Sum256(bytes)
+}
+
+func (b backend) Sign(account wallet.Account, state *channel.State) (wallet.Sig, error) {
+	bytes, err := EncodeState(state)
+	if err != nil {
+		return nil, err
+	}
+	return account.SignData(bytes)
+}
+
+func (b backend) Verify(addr wallet.Address, state *channel.State, sig wallet.Sig) (bool, error) {
+	bytes, err := EncodeState(state)
+	if err != nil {
+		return false, err
+	}
+	return wallet.VerifySignature(bytes, sig, addr)
+}
+
+func (b backend) NewAsset() channel.Asset {
+	return &types.StellarAsset{}
+}
+
+func EncodeState(state *channel.State) ([]byte, error) {
+	ws, err := wire.MakeState(*state)
+	if err != nil {
+		return nil, err
+	}
+	return ws.MarshalBinary()
+}

channel/test/init.go

@@ -0,0 +1,8 @@
+package test
+
+import "perun.network/go-perun/channel/test"
+
+func init() {
+	test.SetRandomizer(&Randomizer{})
+
+}

channel/test/randomizer.go

@@ -0,0 +1,17 @@
+package test
+
+import (
+	"math/rand"
+
+	"perun.network/go-perun/channel"
+	"perun.network/go-perun/channel/test"
+	"perun.network/perun-stellar-backend/channel/types"
+)
+
+type Randomizer struct{}
+
+func (*Randomizer) NewRandomAsset(*rand.Rand) channel.Asset {
+	return &types.StellarAsset{}
+}
+
+var _ test.Randomizer = (*Randomizer)(nil)

channel/types/asset.go

@@ -0,0 +1,112 @@
+package types
+
+import (
+	"errors"
+	"github.com/stellar/go/keypair"
+	"github.com/stellar/go/xdr"
+	"perun.network/go-perun/channel"
+)
+
+const HashLenXdr = 32
+
+type StellarAsset struct {
+	contractID xdr.Hash
+}
+
+func (s StellarAsset) ContractID() xdr.Hash {
+	return s.contractID
+}
+
+func NewStellarAsset(contractID xdr.Hash) *StellarAsset {
+	return &StellarAsset{contractID: contractID}
+}
+
+func (s StellarAsset) MarshalBinary() (data []byte, err error) {
+	return s.contractID.MarshalBinary()
+}
+
+func (s *StellarAsset) UnmarshalBinary(data []byte) error {
+	var addr [HashLenXdr]byte
+	copy(addr[:], data)
+	err := s.contractID.UnmarshalBinary(data)
+	if err != nil {
+		panic(err)
+	}
+	return nil
+}
+
+func (s StellarAsset) Equal(asset channel.Asset) bool {
+	_, ok := asset.(*StellarAsset)
+	return ok
+}
+
+func (s StellarAsset) MakeScAddress() (xdr.ScAddress, error) {
+	hash := s.contractID
+	scvAddr, err := MakeContractAddress(hash)
+	if err != nil {
+		panic(err)
+	}
+	return scvAddr, nil
+}
+
+func (s *StellarAsset) FromScAddress(address xdr.ScAddress) error {
+	addrType := address.Type
+	if addrType != xdr.ScAddressTypeScAddressTypeContract {
+		return errors.New("invalid address type")
+	}
+
+	s.contractID = *address.ContractId
+	return nil
+}
+
+func NewStellarAssetFromScAddress(address xdr.ScAddress) (*StellarAsset, error) {
+	s := &StellarAsset{}
+	err := s.FromScAddress(address)
+	if err != nil {
+		return nil, err
+	}
+	return s, nil
+}
+
+func MustStellarAsset(asset channel.Asset) *StellarAsset {
+	p, ok := asset.(*StellarAsset)
+	if !ok {
+		panic("Asset has invalid type")
+	}
+	return p
+}
+
+func ToStellarAsset(asset channel.Asset) (*StellarAsset, error) {
+	p, ok := asset.(*StellarAsset)
+	if !ok {
+		return nil, errors.New("asset has invalid type")
+	}
+	return p, nil
+}
+
+func MakeAccountAddress(kp keypair.KP) (xdr.ScAddress, error) {
+	accountId, err := xdr.AddressToAccountId(kp.Address())
+	if err != nil {
+		return xdr.ScAddress{}, err
+	}
+	return xdr.NewScAddress(xdr.ScAddressTypeScAddressTypeAccount, accountId)
+}
+
+func MakeContractAddress(contractID xdr.Hash) (xdr.ScAddress, error) {
+	if len(contractID) != HashLenXdr {
+		return xdr.ScAddress{}, errors.New("invalid contractID length for xdr.Hash")
+	}
+
+	return xdr.NewScAddress(xdr.ScAddressTypeScAddressTypeContract, contractID)
+}
+
+func ToAccountAddress(address xdr.ScAddress) (keypair.FromAddress, error) {
+	if address.Type != xdr.ScAddressTypeScAddressTypeAccount {
+		return keypair.FromAddress{}, errors.New("invalid address type")
+	}
+	kp, err := keypair.ParseAddress(address.AccountId.Address())
+	if err != nil {
+		return keypair.FromAddress{}, err
+	}
+	return *kp, nil
+}

channel/types/asset_test.go

@@ -0,0 +1,44 @@
+package types_test
+
+import (
+	"bytes"
+	"github.com/stellar/go/keypair"
+	"github.com/stellar/go/xdr"
+	"perun.network/perun-stellar-backend/channel/types"
+	"testing"
+)
+
+func TestMarshalAndUnmarshalBinary(t *testing.T) {
+	var hash xdr.Hash
+	copy(hash[:], []byte("testhashfortestingonly!testhash"))
+
+	asset := types.NewStellarAsset(hash)
+
+	data, err := asset.MarshalBinary()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	newAsset := &types.StellarAsset{}
+	err = newAsset.UnmarshalBinary(data)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if !bytes.Equal([]byte(newAsset.ContractID().HexString()), []byte(asset.ContractID().HexString())) {
+		t.Fatalf("expected %x, got %x", asset.ContractID(), newAsset.ContractID())
+	}
+}
+
+func TestMakeAccountAddress(t *testing.T) {
+	kp, _ := keypair.Random()
+
+	address, err := types.MakeAccountAddress(kp)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if address.Type != xdr.ScAddressTypeScAddressTypeAccount {
+		t.Fatalf("expected account address type, got %v", address.Type)
+	}
+}

go.mod

@@ -2,18 +2,27 @@ module perun.network/perun-stellar-backend
 
 go 1.19
 
-require github.com/stellar/go v0.0.0-20230718034032-95c2976a11f2
+require github.com/stellar/go v0.0.0-20230905170723-6e18a2f2f583
 
 require (
-	github.com/stretchr/testify v1.7.0
+	github.com/stellar/go-xdr v0.0.0-20211103144802-8017fc4bdfee
+	github.com/stretchr/testify v1.8.1
 	perun.network/go-perun v0.10.6
 	polycry.pt/poly-go v0.0.0-20220222131629-aa4bdbaab60b
 )
 
 require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/go-chi/chi v4.0.3+incompatible // indirect
+	github.com/go-errors/errors v0.0.0-20150906023321-a41850380601 // indirect
+	github.com/gorilla/schema v1.1.0 // indirect
+	github.com/kr/pretty v0.3.1 // indirect
+	github.com/manucorporat/sse v0.0.0-20160126180136-ee05b128a739 // indirect
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
-	github.com/stellar/go-xdr v0.0.0-20211103144802-8017fc4bdfee // indirect
-	gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c // indirect
+	github.com/segmentio/go-loggly v0.5.1-0.20171222203950-eb91657e62b2 // indirect
+	github.com/sirupsen/logrus v1.8.1 // indirect
+	github.com/stretchr/objx v0.5.0 // indirect
+	golang.org/x/sys v0.11.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

go.sum

@@ -1,33 +1,82 @@
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