feat: use f4 eth addresses wherever possible (#9532)

Co-authored-by: Raúl Kripalani <raul@protocol.ai>

api/eth_transactions.go

@@ -81,7 +81,7 @@ func NewEthTxArgsFromMessage(msg *types.Message) (EthTxArgs, error) {
 		}
 	}
 	if isCreate {
-		addr, err := EthAddressFromFilecoinIDAddress(msg.To)
+		addr, err := EthAddressFromFilecoinAddress(msg.To)
 		if err != nil {
 			return EthTxArgs{}, nil
 		}

api/eth_types.go

@@ -13,6 +13,7 @@ import (
 	"github.com/filecoin-project/go-state-types/builtin"
 	"github.com/ipfs/go-cid"
 	"github.com/multiformats/go-multihash"
+	"github.com/multiformats/go-varint"
 	"golang.org/x/xerrors"
 
 	"github.com/filecoin-project/go-address"
@@ -292,15 +293,41 @@ func (ea EthAddress) ToFilecoinAddress() (address.Address, error) {
 	return addr, nil
 }
 
-func EthAddressFromFilecoinIDAddress(addr address.Address) (EthAddress, error) {
-	id, err := address.IDFromAddress(addr)
-	if err != nil {
-		return EthAddress{}, err
+func TryEthAddressFromFilecoinAddress(addr address.Address, allowId bool) (EthAddress, bool, error) {
+	switch addr.Protocol() {
+	case address.ID:
+		if !allowId {
+			return EthAddress{}, false, nil
+		}
+		id, err := address.IDFromAddress(addr)
+		if err != nil {
+			return EthAddress{}, false, err
+		}
+		var ethaddr EthAddress
+		ethaddr[0] = 0xff
+		binary.BigEndian.PutUint64(ethaddr[12:], id)
+		return ethaddr, true, nil
+	case address.Delegated:
+		payload := addr.Payload()
+		namespace, n, err := varint.FromUvarint(payload)
+		if err != nil {
+			return EthAddress{}, false, xerrors.Errorf("invalid delegated address namespace in: %s", addr)
+		}
+		payload = payload[n:]
+		if namespace == builtin.EthereumAddressManagerActorID {
+			addr, err := EthAddressFromBytes(payload)
+			return addr, err == nil, err
+		}
 	}
-	var ethaddr EthAddress
-	ethaddr[0] = 0xff
-	binary.BigEndian.PutUint64(ethaddr[12:], id)
-	return ethaddr, nil
+	return EthAddress{}, false, nil
+}
+
+func EthAddressFromFilecoinAddress(addr address.Address) (EthAddress, error) {
+	ethAddr, ok, err := TryEthAddressFromFilecoinAddress(addr, true)
+	if !ok && err == nil {
+		err = xerrors.Errorf("failed to convert filecoin address %s to an equivalent eth address", addr)
+	}
+	return ethAddr, err
 }
 
 func EthAddressFromHex(s string) (EthAddress, error) {

api/eth_types_test.go

@@ -119,7 +119,7 @@ func TestParseEthAddr(t *testing.T) {
 		addr, err := address.NewIDAddress(id)
 		require.Nil(t, err)
 
-		eaddr, err := EthAddressFromFilecoinIDAddress(addr)
+		eaddr, err := EthAddressFromFilecoinAddress(addr)
 		require.Nil(t, err)
 
 		faddr, err := eaddr.ToFilecoinAddress()

node/impl/full/eth.go

@@ -588,6 +588,50 @@ func (a *EthModule) ethBlockFromFilecoinTipSet(ctx context.Context, ts *types.Ti
 	return block, nil
 }
 
+// lookupEthAddress makes its best effort at finding the Ethereum address for a
+// Filecoin address. It does the following:
+//
+// 1. If the supplied address is an f410 address, we return its payload as the EthAddress.
+// 2. Otherwise (f0, f1, f2, f3), we look up the actor on the state tree. If it has a predictable address, we return it if it's f410 address.
+// 3. Otherwise, we fall back to returning a masked ID Ethereum address. If the supplied address is an f0 address, we
+//    use that ID to form the masked ID address.
+// 4. Otherwise, we fetch the actor's ID from the state tree and form the masked ID with it.
+func (a *EthModule) lookupEthAddress(ctx context.Context, addr address.Address) (api.EthAddress, error) {
+	// Attempt to convert directly.
+	if ethAddr, ok, err := api.TryEthAddressFromFilecoinAddress(addr, false); err != nil {
+		return api.EthAddress{}, err
+	} else if ok {
+		return ethAddr, nil
+	}
+
+	// Lookup on the target actor.
+	actor, err := a.StateAPI.StateGetActor(ctx, addr, types.EmptyTSK)
+	if err != nil {
+		return api.EthAddress{}, err
+	}
+	if actor.Address != nil {
+		if ethAddr, ok, err := api.TryEthAddressFromFilecoinAddress(*actor.Address, false); err != nil {
+			return api.EthAddress{}, err
+		} else if ok {
+			return ethAddr, nil
+		}
+	}
+
+	// Check if we already have an ID addr, and use it if possible.
+	if ethAddr, ok, err := api.TryEthAddressFromFilecoinAddress(addr, true); err != nil {
+		return api.EthAddress{}, err
+	} else if ok {
+		return ethAddr, nil
+	}
+
+	// Otherwise, resolve the ID addr.
+	idAddr, err := a.StateAPI.StateLookupID(ctx, addr, types.EmptyTSK)
+	if err != nil {
+		return api.EthAddress{}, err
+	}
+	return api.EthAddressFromFilecoinAddress(idAddr)
+}
+
 func (a *EthModule) ethTxFromFilecoinMessageLookup(ctx context.Context, msgLookup *api.MsgLookup) (api.EthTx, error) {
 	if msgLookup == nil {
 		return api.EthTx{}, fmt.Errorf("msg does not exist")
@@ -613,22 +657,12 @@ func (a *EthModule) ethTxFromFilecoinMessageLookup(ctx context.Context, msgLooku
 		return api.EthTx{}, err
 	}
 
-	fromFilIdAddr, err := a.StateAPI.StateLookupID(ctx, msg.From, types.EmptyTSK)
+	fromEthAddr, err := a.lookupEthAddress(ctx, msg.From)
 	if err != nil {
 		return api.EthTx{}, err
 	}
 
-	fromEthAddr, err := api.EthAddressFromFilecoinIDAddress(fromFilIdAddr)
-	if err != nil {
-		return api.EthTx{}, err
-	}
-
-	toFilAddr, err := a.StateAPI.StateLookupID(ctx, msg.To, types.EmptyTSK)
-	if err != nil {
-		return api.EthTx{}, err
-	}
-
-	toEthAddr, err := api.EthAddressFromFilecoinIDAddress(toFilAddr)
+	toEthAddr, err := a.lookupEthAddress(ctx, msg.To)
 	if err != nil {
 		return api.EthTx{}, err
 	}
@@ -636,7 +670,8 @@ func (a *EthModule) ethTxFromFilecoinMessageLookup(ctx context.Context, msgLooku
 	toAddr := &toEthAddr
 	input := msg.Params
 	// Check to see if we need to decode as contract deployment.
-	if toFilAddr == builtintypes.EthereumAddressManagerActorAddr {
+	// We don't need to resolve the to address, because there's only one form (an ID).
+	if msg.To == builtintypes.EthereumAddressManagerActorAddr {
 		switch msg.Method {
 		case builtintypes.MethodsEAM.Create:
 			toAddr = nil