go-waku/mobile/api.go

406 lines
9.1 KiB
Go

// Implements gomobile bindings for go-waku. Contains a set of functions that
// are exported when go-waku is exported as libraries for mobile devices
package gowaku
import (
"context"
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"encoding/hex"
"encoding/json"
"errors"
"fmt"
"net"
"time"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/crypto/secp256k1"
"github.com/libp2p/go-libp2p-core/peer"
"github.com/multiformats/go-multiaddr"
"github.com/status-im/go-waku/waku/v2/node"
"github.com/status-im/go-waku/waku/v2/protocol"
"github.com/status-im/go-waku/waku/v2/protocol/pb"
)
var wakuNode *node.WakuNode
var errWakuNodeNotReady = errors.New("go-waku not initialized")
func randomHex(n int) (string, error) {
bytes := make([]byte, n)
if _, err := rand.Read(bytes); err != nil {
return "", err
}
return hex.EncodeToString(bytes), nil
}
type wakuConfig struct {
Host *string `json:"host,omitempty"`
Port *int `json:"port,omitempty"`
AdvertiseAddress *string `json:"advertiseAddr,omitempty"`
NodeKey *string `json:"nodeKey,omitempty"`
KeepAliveInterval *int `json:"keepAliveInterval,omitempty"`
EnableRelay *bool `json:"relay"`
MinPeersToPublish *int `json:"minPeersToPublish"`
}
var defaultHost = "0.0.0.0"
var defaultPort = 60000
var defaultKeepAliveInterval = 20
var defaultEnableRelay = true
var defaultMinPeersToPublish = 0
func getConfig(configJSON string) (wakuConfig, error) {
var config wakuConfig
if configJSON != "" {
err := json.Unmarshal([]byte(configJSON), &config)
if err != nil {
return wakuConfig{}, err
}
}
if config.Host == nil {
config.Host = &defaultHost
}
if config.EnableRelay == nil {
config.EnableRelay = &defaultEnableRelay
}
if config.Host == nil {
config.Host = &defaultHost
}
if config.Port == nil {
config.Port = &defaultPort
}
if config.KeepAliveInterval == nil {
config.KeepAliveInterval = &defaultKeepAliveInterval
}
if config.MinPeersToPublish == nil {
config.MinPeersToPublish = &defaultMinPeersToPublish
}
return config, nil
}
func NewNode(configJSON string) string {
if wakuNode != nil {
return makeJSONResponse(errors.New("go-waku already initialized. stop it first"))
}
config, err := getConfig(configJSON)
if err != nil {
return makeJSONResponse(err)
}
hostAddr, err := net.ResolveTCPAddr("tcp", fmt.Sprintf("%s:%d", *config.Host, *config.Port))
if err != nil {
return makeJSONResponse(err)
}
var prvKey *ecdsa.PrivateKey
if config.NodeKey != nil {
prvKey, err = crypto.HexToECDSA(*config.NodeKey)
if err != nil {
return makeJSONResponse(err)
}
} else {
key, err := randomHex(32)
if err != nil {
return makeJSONResponse(err)
}
prvKey, err = crypto.HexToECDSA(key)
if err != nil {
return makeJSONResponse(err)
}
}
opts := []node.WakuNodeOption{
node.WithPrivateKey(prvKey),
node.WithHostAddress(hostAddr),
node.WithKeepAlive(time.Duration(*config.KeepAliveInterval) * time.Second),
}
if *config.EnableRelay {
opts = append(opts, node.WithWakuRelayAndMinPeers(*config.MinPeersToPublish))
}
ctx := context.Background()
w, err := node.New(ctx, opts...)
if err != nil {
return makeJSONResponse(err)
}
wakuNode = w
return makeJSONResponse(nil)
}
func Start() string {
if wakuNode == nil {
return makeJSONResponse(errWakuNodeNotReady)
}
if err := wakuNode.Start(); err != nil {
return makeJSONResponse(err)
}
return makeJSONResponse(nil)
}
func Stop() string {
if wakuNode == nil {
return makeJSONResponse(errWakuNodeNotReady)
}
wakuNode.Stop()
wakuNode = nil
return makeJSONResponse(nil)
}
func PeerID() string {
if wakuNode == nil {
return makeJSONResponse(errWakuNodeNotReady)
}
return prepareJSONResponse(wakuNode.ID(), nil)
}
func ListenAddresses() string {
if wakuNode == nil {
return makeJSONResponse(errWakuNodeNotReady)
}
var addresses []string
for _, addr := range wakuNode.ListenAddresses() {
addresses = append(addresses, addr.String())
}
return prepareJSONResponse(addresses, nil)
}
func AddPeer(address string, protocolID string) string {
if wakuNode == nil {
return makeJSONResponse(errWakuNodeNotReady)
}
ma, err := multiaddr.NewMultiaddr(address)
if err != nil {
return makeJSONResponse(err)
}
peerID, err := wakuNode.AddPeer(ma, protocolID)
return prepareJSONResponse(peerID, err)
}
func Connect(address string, ms int) string {
if wakuNode == nil {
return makeJSONResponse(errWakuNodeNotReady)
}
var ctx context.Context
var cancel context.CancelFunc
if ms > 0 {
ctx, cancel = context.WithTimeout(context.Background(), time.Duration(int(ms))*time.Millisecond)
defer cancel()
} else {
ctx = context.Background()
}
err := wakuNode.DialPeer(ctx, address)
return makeJSONResponse(err)
}
func ConnectPeerID(peerID string, ms int) string {
if wakuNode == nil {
return makeJSONResponse(errWakuNodeNotReady)
}
var ctx context.Context
var cancel context.CancelFunc
pID, err := peer.Decode(peerID)
if err != nil {
return makeJSONResponse(err)
}
if ms > 0 {
ctx, cancel = context.WithTimeout(context.Background(), time.Duration(int(ms))*time.Millisecond)
defer cancel()
} else {
ctx = context.Background()
}
err = wakuNode.DialPeerByID(ctx, pID)
return makeJSONResponse(err)
}
func Disconnect(peerID string) string {
if wakuNode == nil {
return makeJSONResponse(errWakuNodeNotReady)
}
pID, err := peer.Decode(peerID)
if err != nil {
return makeJSONResponse(err)
}
err = wakuNode.ClosePeerById(pID)
return makeJSONResponse(err)
}
func PeerCnt() string {
if wakuNode == nil {
return makeJSONResponse(errWakuNodeNotReady)
}
return prepareJSONResponse(wakuNode.PeerCount(), nil)
}
func ContentTopic(applicationName string, applicationVersion int, contentTopicName string, encoding string) string {
return protocol.NewContentTopic(applicationName, uint(applicationVersion), contentTopicName, encoding).String()
}
func PubsubTopic(name string, encoding string) string {
return protocol.NewPubsubTopic(name, encoding).String()
}
func DefaultPubsubTopic() string {
return protocol.DefaultPubsubTopic().String()
}
func getTopic(topic string) string {
if topic == "" {
return protocol.DefaultPubsubTopic().String()
}
return topic
}
type subscriptionMsg struct {
MessageID string `json:"messageID"`
PubsubTopic string `json:"pubsubTopic"`
Message *pb.WakuMessage `json:"wakuMessage"`
}
func toSubscriptionMessage(msg *protocol.Envelope) *subscriptionMsg {
return &subscriptionMsg{
MessageID: hexutil.Encode(msg.Hash()),
PubsubTopic: msg.PubsubTopic(),
Message: msg.Message(),
}
}
func Peers() string {
if wakuNode == nil {
return makeJSONResponse(errWakuNodeNotReady)
}
peers, err := wakuNode.Peers()
return prepareJSONResponse(peers, err)
}
func unmarshalPubkey(pub []byte) (ecdsa.PublicKey, error) {
x, y := elliptic.Unmarshal(secp256k1.S256(), pub)
if x == nil {
return ecdsa.PublicKey{}, errors.New("invalid public key")
}
return ecdsa.PublicKey{Curve: secp256k1.S256(), X: x, Y: y}, nil
}
func DecodeSymmetric(messageJSON string, symmetricKey string) string {
var msg pb.WakuMessage
err := json.Unmarshal([]byte(messageJSON), &msg)
if err != nil {
return makeJSONResponse(err)
}
if msg.Version == 0 {
return prepareJSONResponse(msg.Payload, nil)
} else if msg.Version > 1 {
return makeJSONResponse(errors.New("unsupported wakumessage version"))
}
keyInfo := &node.KeyInfo{
Kind: node.Symmetric,
}
keyInfo.SymKey, err = hexutil.Decode(symmetricKey)
if err != nil {
return makeJSONResponse(err)
}
payload, err := node.DecodePayload(&msg, keyInfo)
if err != nil {
return makeJSONResponse(err)
}
response := struct {
PubKey string `json:"pubkey"`
Signature string `json:"signature"`
Data []byte `json:"data"`
Padding []byte `json:"padding"`
}{
PubKey: hexutil.Encode(crypto.FromECDSAPub(payload.PubKey)),
Signature: hexutil.Encode(payload.Signature),
Data: payload.Data,
Padding: payload.Padding,
}
return prepareJSONResponse(response, err)
}
func DecodeAsymmetric(messageJSON string, privateKey string) string {
var msg pb.WakuMessage
err := json.Unmarshal([]byte(messageJSON), &msg)
if err != nil {
return makeJSONResponse(err)
}
if msg.Version == 0 {
return prepareJSONResponse(msg.Payload, nil)
} else if msg.Version > 1 {
return makeJSONResponse(errors.New("unsupported wakumessage version"))
}
keyInfo := &node.KeyInfo{
Kind: node.Asymmetric,
}
keyBytes, err := hexutil.Decode(privateKey)
if err != nil {
return makeJSONResponse(err)
}
keyInfo.PrivKey, err = crypto.ToECDSA(keyBytes)
if err != nil {
return makeJSONResponse(err)
}
payload, err := node.DecodePayload(&msg, keyInfo)
if err != nil {
return makeJSONResponse(err)
}
response := struct {
PubKey string `json:"pubkey"`
Signature string `json:"signature"`
Data []byte `json:"data"`
Padding []byte `json:"padding"`
}{
PubKey: hexutil.Encode(crypto.FromECDSAPub(payload.PubKey)),
Signature: hexutil.Encode(payload.Signature),
Data: payload.Data,
Padding: payload.Padding,
}
return prepareJSONResponse(response, err)
}