Move warp/payload from Subnet-EVM

Move warp/payload types to this repo so it can be easily reused from other
subnets.

vms/platformvm/warp/payload/README.md

@@ -0,0 +1,44 @@
+# Payload
+
+An Avalanche Unsigned Warp Message already includes a `networkID`, `sourceChainID`, and `payload` field. The `payload` field is parsed into one of the types included in this package to be further handled by the VM.
+
+## AddressedPayload
+
+AddressedPayload:
+```
++---------------------+--------+----------------------------------+
+|             codecID : uint16 |                          2 bytes |
++---------------------+--------+----------------------------------+
+|              typeID : uint32 |                          4 bytes |
++---------------------+--------+----------------------------------+
+|       sourceAddress : []byte |                 4 + len(address) |
++---------------------+--------+----------------------------------+
+|             payload : []byte |                 4 + len(payload) |
++---------------------+--------+----------------------------------+
+                               | 14 + len(payload) + len(address) |
+                               +----------------------------------+
+```
+
+- `codecID` is the codec version used to serialize the payload and is hardcoded to `0x0000`
+- `typeID` is the payload type identifier and is `0x00000000` for `AddressedPayload`
+- `sourceAddress` is the address that called `sendWarpPrecompile` on the source chain
+- `payload` is an arbitrary byte array payload
+
+## BlockHashPayload
+
+BlockHashPayload:
+```
++-----------------+----------+-----------+
+|         codecID :   uint16 |   2 bytes |
++-----------------+----------+-----------+
+|          typeID :   uint32 |   4 bytes |
++-----------------+----------+-----------+
+|       blockHash : [32]byte |  32 bytes |
++-----------------+----------+-----------+
+                             |  38 bytes |
+                             +-----------+
+```
+
+- `codecID` is the codec version used to serialize the payload and is hardcoded to `0x0000`
+- `typeID` is the payload type identifier and is `0x00000001` for `BlockHashPayload`
+- `blockHash` is a blockHash from the `sourceChainID`. A signed block hash payload indicates that the signer has accepted the block on the source chain.

vms/platformvm/warp/payload/addressed_payload.go

@@ -0,0 +1,56 @@
+// Copyright (C) 2019-2023, Ava Labs, Inc. All rights reserved.
+// See the file LICENSE for licensing terms.
+
+package payload
+
+import "fmt"
+
+// AddressedPayload defines the format for delivering a point to point message across VMs
+// ie. (ChainA, AddressA) -> (ChainB, AddressB)
+type AddressedPayload struct {
+	SourceAddress []byte `serialize:"true"`
+	Payload       []byte `serialize:"true"`
+
+	bytes []byte
+}
+
+// NewAddressedPayload creates a new *AddressedPayload and initializes it.
+func NewAddressedPayload(sourceAddress []byte, payload []byte) (*AddressedPayload, error) {
+	ap := &AddressedPayload{
+		SourceAddress: sourceAddress,
+		Payload:       payload,
+	}
+	return ap, ap.initialize()
+}
+
+// ParseAddressedPayload converts a slice of bytes into an initialized
+// AddressedPayload.
+func ParseAddressedPayload(b []byte) (*AddressedPayload, error) {
+	var unmarshalledPayloadIntf any
+	if _, err := c.Unmarshal(b, &unmarshalledPayloadIntf); err != nil {
+		return nil, err
+	}
+	payload, ok := unmarshalledPayloadIntf.(*AddressedPayload)
+	if !ok {
+		return nil, fmt.Errorf("%w: %T", errWrongType, unmarshalledPayloadIntf)
+	}
+	payload.bytes = b
+	return payload, nil
+}
+
+// initialize recalculates the result of Bytes().
+func (a *AddressedPayload) initialize() error {
+	payloadIntf := any(a)
+	bytes, err := c.Marshal(codecVersion, &payloadIntf)
+	if err != nil {
+		return fmt.Errorf("couldn't marshal warp addressed payload: %w", err)
+	}
+	a.bytes = bytes
+	return nil
+}
+
+// Bytes returns the binary representation of this payload. It assumes that the
+// payload is initialized from either NewAddressedPayload or ParseAddressedPayload.
+func (a *AddressedPayload) Bytes() []byte {
+	return a.bytes
+}

vms/platformvm/warp/payload/block_hash_payload.go

@@ -0,0 +1,57 @@
+// Copyright (C) 2019-2023, Ava Labs, Inc. All rights reserved.
+// See the file LICENSE for licensing terms.
+
+package payload
+
+import (
+	"fmt"
+
+	"github.com/ava-labs/avalanchego/ids"
+)
+
+// BlockHashPayload includes the block hash
+type BlockHashPayload struct {
+	BlockHash ids.ID `serialize:"true"`
+
+	bytes []byte
+}
+
+// NewBlockHashPayload creates a new *BlockHashPayload and initializes it.
+func NewBlockHashPayload(blockHash ids.ID) (*BlockHashPayload, error) {
+	bhp := &BlockHashPayload{
+		BlockHash: blockHash,
+	}
+	return bhp, bhp.initialize()
+}
+
+// ParseBlockHashPayload converts a slice of bytes into an initialized
+// BlockHashPayload
+func ParseBlockHashPayload(b []byte) (*BlockHashPayload, error) {
+	var unmarshalledPayloadIntf any
+	if _, err := c.Unmarshal(b, &unmarshalledPayloadIntf); err != nil {
+		return nil, err
+	}
+	payload, ok := unmarshalledPayloadIntf.(*BlockHashPayload)
+	if !ok {
+		return nil, fmt.Errorf("%w: %T", errWrongType, unmarshalledPayloadIntf)
+	}
+	payload.bytes = b
+	return payload, nil
+}
+
+// initialize recalculates the result of Bytes().
+func (b *BlockHashPayload) initialize() error {
+	payloadIntf := any(b)
+	bytes, err := c.Marshal(codecVersion, &payloadIntf)
+	if err != nil {
+		return fmt.Errorf("couldn't marshal block hash payload: %w", err)
+	}
+	b.bytes = bytes
+	return nil
+}
+
+// Bytes returns the binary representation of this payload. It assumes that the
+// payload is initialized from either NewBlockHashPayload or ParseBlockHashPayload.
+func (b *BlockHashPayload) Bytes() []byte {
+	return b.bytes
+}

vms/platformvm/warp/payload/codec.go

@@ -0,0 +1,43 @@
+// Copyright (C) 2019-2023, Ava Labs, Inc. All rights reserved.
+// See the file LICENSE for licensing terms.
+
+package payload
+
+import (
+	"errors"
+
+	"github.com/ava-labs/avalanchego/codec"
+	"github.com/ava-labs/avalanchego/codec/linearcodec"
+	"github.com/ava-labs/avalanchego/utils/units"
+	"github.com/ava-labs/avalanchego/utils/wrappers"
+)
+
+var errWrongType = errors.New("wrong payload type")
+
+const (
+	codecVersion = 0
+
+	MaxMessageSize = 24 * units.KiB
+
+	// Note: Modifying this variable can have subtle implications on memory
+	// usage when parsing malformed payloads.
+	MaxSliceLen = 24 * units.KiB
+)
+
+// Codec does serialization and deserialization for Warp messages.
+var c codec.Manager
+
+func init() {
+	c = codec.NewManager(MaxMessageSize)
+	lc := linearcodec.NewCustomMaxLength(MaxSliceLen)
+
+	errs := wrappers.Errs{}
+	errs.Add(
+		lc.RegisterType(&AddressedPayload{}),
+		lc.RegisterType(&BlockHashPayload{}),
+		c.RegisterCodec(codecVersion, lc),
+	)
+	if errs.Errored() {
+		panic(errs.Err)
+	}
+}

vms/platformvm/warp/payload/payload_test.go

@@ -0,0 +1,105 @@
+// Copyright (C) 2019-2023, Ava Labs, Inc. All rights reserved.
+// See the file LICENSE for licensing terms.
+
+package payload
+
+import (
+	"encoding/base64"
+	"testing"
+
+	"github.com/ava-labs/avalanchego/codec"
+	"github.com/ava-labs/avalanchego/ids"
+	"github.com/ava-labs/avalanchego/utils"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestAddressedPayload(t *testing.T) {
+	require := require.New(t)
+	shortID := ids.GenerateTestShortID()
+
+	addressedPayload, err := NewAddressedPayload(
+		shortID[:],
+		[]byte{1, 2, 3},
+	)
+	require.NoError(err)
+
+	addressedPayloadBytes := addressedPayload.Bytes()
+	addressedPayload2, err := ParseAddressedPayload(addressedPayloadBytes)
+	require.NoError(err)
+	require.Equal(addressedPayload, addressedPayload2)
+}
+
+func TestParseAddressedPayloadJunk(t *testing.T) {
+	require := require.New(t)
+	_, err := ParseAddressedPayload(utils.RandomBytes(1024))
+	require.ErrorIs(err, codec.ErrUnknownVersion)
+}
+
+func TestParseAddressedPayload(t *testing.T) {
+	base64Payload := "AAAAAAAAAAAAEAECAwAAAAAAAAAAAAAAAAAAAAADCgsM"
+	payload := &AddressedPayload{
+		SourceAddress: []byte{1, 2, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
+		Payload:       []byte{10, 11, 12},
+	}
+
+	require.NoError(t, payload.initialize())
+
+	require.Equal(t, base64Payload, base64.StdEncoding.EncodeToString(payload.Bytes()))
+
+	parsedPayload, err := ParseAddressedPayload(payload.Bytes())
+	require.NoError(t, err)
+	require.Equal(t, payload, parsedPayload)
+}
+
+func TestBlockHashPayload(t *testing.T) {
+	require := require.New(t)
+
+	blockHashPayload, err := NewBlockHashPayload(ids.GenerateTestID())
+	require.NoError(err)
+
+	blockHashPayloadBytes := blockHashPayload.Bytes()
+	blockHashPayload2, err := ParseBlockHashPayload(blockHashPayloadBytes)
+	require.NoError(err)
+	require.Equal(blockHashPayload, blockHashPayload2)
+}
+
+func TestParseBlockHashPayloadJunk(t *testing.T) {
+	require := require.New(t)
+	_, err := ParseBlockHashPayload(utils.RandomBytes(1024))
+	require.ErrorIs(err, codec.ErrUnknownVersion)
+}
+
+func TestParseBlockHashPayload(t *testing.T) {
+	base64Payload := "AAAAAAABBAUGAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA="
+	payload := &BlockHashPayload{
+		BlockHash: ids.ID{4, 5, 6},
+	}
+
+	require.NoError(t, payload.initialize())
+
+	require.Equal(t, base64Payload, base64.StdEncoding.EncodeToString(payload.Bytes()))
+
+	parsedPayload, err := ParseBlockHashPayload(payload.Bytes())
+	require.NoError(t, err)
+	require.Equal(t, payload, parsedPayload)
+}
+
+func TestParseWrongPayloadType(t *testing.T) {
+	require := require.New(t)
+	blockHashPayload, err := NewBlockHashPayload(ids.GenerateTestID())
+	require.NoError(err)
+
+	shortID := ids.GenerateTestShortID()
+	addressedPayload, err := NewAddressedPayload(
+		shortID[:],
+		[]byte{1, 2, 3},
+	)
+	require.NoError(err)
+
+	_, err = ParseAddressedPayload(blockHashPayload.Bytes())
+	require.ErrorIs(err, errWrongType)
+
+	_, err = ParseBlockHashPayload(addressedPayload.Bytes())
+	require.ErrorIs(err, errWrongType)
+}