Official Go implementation of the Ethereum protocol
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go-ethereum/whisper/whisperv5/api.go

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// Copyright 2016 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package whisperv5
import (
"encoding/json"
"errors"
"fmt"
mathrand "math/rand"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/log"
)
var whisperOffLineErr = errors.New("whisper is offline")
// PublicWhisperAPI provides the whisper RPC service.
type PublicWhisperAPI struct {
whisper *Whisper
}
// NewPublicWhisperAPI create a new RPC whisper service.
func NewPublicWhisperAPI(w *Whisper) *PublicWhisperAPI {
return &PublicWhisperAPI{whisper: w}
}
// Start starts the Whisper worker threads.
func (api *PublicWhisperAPI) Start() error {
if api.whisper == nil {
return whisperOffLineErr
}
return api.whisper.Start(nil)
}
// Stop stops the Whisper worker threads.
func (api *PublicWhisperAPI) Stop() error {
if api.whisper == nil {
return whisperOffLineErr
}
return api.whisper.Stop()
}
// Version returns the Whisper version this node offers.
func (api *PublicWhisperAPI) Version() (hexutil.Uint, error) {
if api.whisper == nil {
return 0, whisperOffLineErr
}
return hexutil.Uint(api.whisper.Version()), nil
}
// Stats returns the Whisper statistics for diagnostics.
func (api *PublicWhisperAPI) Stats() (string, error) {
if api.whisper == nil {
return "", whisperOffLineErr
}
return api.whisper.Stats(), nil
}
// MarkPeerTrusted marks specific peer trusted, which will allow it
// to send historic (expired) messages.
func (api *PublicWhisperAPI) MarkPeerTrusted(peerID hexutil.Bytes) error {
if api.whisper == nil {
return whisperOffLineErr
}
return api.whisper.MarkPeerTrusted(peerID)
}
// RequestHistoricMessages requests the peer to deliver the old (expired) messages.
// data contains parameters (time frame, payment details, etc.), required
// by the remote email-like server. Whisper is not aware about the data format,
// it will just forward the raw data to the server.
//func (api *PublicWhisperAPI) RequestHistoricMessages(peerID hexutil.Bytes, data hexutil.Bytes) error {
// if api.whisper == nil {
// return whisperOffLineErr
// }
// return api.whisper.RequestHistoricMessages(peerID, data)
//}
// HasIdentity checks if the whisper node is configured with the private key
// of the specified public pair.
func (api *PublicWhisperAPI) HasIdentity(identity string) (bool, error) {
if api.whisper == nil {
return false, whisperOffLineErr
}
return api.whisper.HasIdentity(identity), nil
}
// DeleteIdentity deletes the specifies key if it exists.
func (api *PublicWhisperAPI) DeleteIdentity(identity string) error {
if api.whisper == nil {
return whisperOffLineErr
}
api.whisper.DeleteIdentity(identity)
return nil
}
// NewIdentity generates a new cryptographic identity for the client, and injects
// it into the known identities for message decryption.
func (api *PublicWhisperAPI) NewIdentity() (string, error) {
if api.whisper == nil {
return "", whisperOffLineErr
}
identity := api.whisper.NewIdentity()
return common.ToHex(crypto.FromECDSAPub(&identity.PublicKey)), nil
}
// GenerateSymKey generates a random symmetric key and stores it under
// the 'name' id. Will be used in the future for session key exchange.
func (api *PublicWhisperAPI) GenerateSymKey(name string) error {
if api.whisper == nil {
return whisperOffLineErr
}
return api.whisper.GenerateSymKey(name)
}
// AddSymKey stores the key under the 'name' id.
func (api *PublicWhisperAPI) AddSymKey(name string, key hexutil.Bytes) error {
if api.whisper == nil {
return whisperOffLineErr
}
return api.whisper.AddSymKey(name, key)
}
// HasSymKey returns true if there is a key associated with the name string.
// Otherwise returns false.
func (api *PublicWhisperAPI) HasSymKey(name string) (bool, error) {
if api.whisper == nil {
return false, whisperOffLineErr
}
res := api.whisper.HasSymKey(name)
return res, nil
}
// DeleteSymKey deletes the key associated with the name string if it exists.
func (api *PublicWhisperAPI) DeleteSymKey(name string) error {
if api.whisper == nil {
return whisperOffLineErr
}
api.whisper.DeleteSymKey(name)
return nil
}
// NewWhisperFilter creates and registers a new message filter to watch for inbound whisper messages.
// Returns the ID of the newly created Filter.
func (api *PublicWhisperAPI) NewFilter(args WhisperFilterArgs) (string, error) {
if api.whisper == nil {
return "", whisperOffLineErr
}
filter := Filter{
Src: crypto.ToECDSAPub(common.FromHex(args.From)),
KeySym: api.whisper.GetSymKey(args.KeyName),
PoW: args.PoW,
Messages: make(map[common.Hash]*ReceivedMessage),
AcceptP2P: args.AcceptP2P,
}
if len(filter.KeySym) > 0 {
filter.SymKeyHash = crypto.Keccak256Hash(filter.KeySym)
}
filter.Topics = append(filter.Topics, args.Topics...)
if len(args.Topics) == 0 && len(args.KeyName) != 0 {
info := "NewFilter: at least one topic must be specified"
log.Error(fmt.Sprintf(info))
return "", errors.New(info)
}
if len(args.KeyName) != 0 && len(filter.KeySym) == 0 {
info := "NewFilter: key was not found by name: " + args.KeyName
log.Error(fmt.Sprintf(info))
return "", errors.New(info)
}
if len(args.To) == 0 && len(filter.KeySym) == 0 {
info := "NewFilter: filter must contain either symmetric or asymmetric key"
log.Error(fmt.Sprintf(info))
return "", errors.New(info)
}
if len(args.To) != 0 && len(filter.KeySym) != 0 {
info := "NewFilter: filter must not contain both symmetric and asymmetric key"
log.Error(fmt.Sprintf(info))
return "", errors.New(info)
}
if len(args.To) > 0 {
dst := crypto.ToECDSAPub(common.FromHex(args.To))
if !ValidatePublicKey(dst) {
info := "NewFilter: Invalid 'To' address"
log.Error(fmt.Sprintf(info))
return "", errors.New(info)
}
filter.KeyAsym = api.whisper.GetIdentity(string(args.To))
if filter.KeyAsym == nil {
info := "NewFilter: non-existent identity provided"
log.Error(fmt.Sprintf(info))
return "", errors.New(info)
}
}
if len(args.From) > 0 {
if !ValidatePublicKey(filter.Src) {
info := "NewFilter: Invalid 'From' address"
log.Error(fmt.Sprintf(info))
return "", errors.New(info)
}
}
return api.whisper.Watch(&filter)
}
// UninstallFilter disables and removes an existing filter.
func (api *PublicWhisperAPI) UninstallFilter(filterId string) {
api.whisper.Unwatch(filterId)
}
// GetFilterChanges retrieves all the new messages matched by a filter since the last retrieval.
func (api *PublicWhisperAPI) GetFilterChanges(filterId string) []*WhisperMessage {
f := api.whisper.GetFilter(filterId)
if f != nil {
newMail := f.Retrieve()
return toWhisperMessages(newMail)
}
return toWhisperMessages(nil)
}
// GetMessages retrieves all the known messages that match a specific filter.
func (api *PublicWhisperAPI) GetMessages(filterId string) []*WhisperMessage {
all := api.whisper.Messages(filterId)
return toWhisperMessages(all)
}
// toWhisperMessages converts a Whisper message to a RPC whisper message.
func toWhisperMessages(messages []*ReceivedMessage) []*WhisperMessage {
msgs := make([]*WhisperMessage, len(messages))
for i, msg := range messages {
msgs[i] = NewWhisperMessage(msg)
}
return msgs
}
// Post creates a whisper message and injects it into the network for distribution.
func (api *PublicWhisperAPI) Post(args PostArgs) error {
if api.whisper == nil {
return whisperOffLineErr
}
params := MessageParams{
TTL: args.TTL,
Dst: crypto.ToECDSAPub(common.FromHex(args.To)),
KeySym: api.whisper.GetSymKey(args.KeyName),
Topic: args.Topic,
Payload: args.Payload,
Padding: args.Padding,
WorkTime: args.WorkTime,
PoW: args.PoW,
}
if len(args.From) > 0 {
pub := crypto.ToECDSAPub(common.FromHex(args.From))
if !ValidatePublicKey(pub) {
info := "Post: Invalid 'From' address"
log.Error(fmt.Sprintf(info))
return errors.New(info)
}
params.Src = api.whisper.GetIdentity(string(args.From))
if params.Src == nil {
info := "Post: non-existent identity provided"
log.Error(fmt.Sprintf(info))
return errors.New(info)
}
}
filter := api.whisper.GetFilter(args.FilterID)
if filter == nil && len(args.FilterID) > 0 {
info := fmt.Sprintf("Post: wrong filter id %s", args.FilterID)
log.Error(fmt.Sprintf(info))
return errors.New(info)
}
if filter != nil {
// get the missing fields from the filter
if params.KeySym == nil && filter.KeySym != nil {
params.KeySym = filter.KeySym
}
if params.Src == nil && filter.Src != nil {
params.Src = filter.KeyAsym
}
if (params.Topic == TopicType{}) {
sz := len(filter.Topics)
if sz < 1 {
info := fmt.Sprintf("Post: no topics in filter # %s", args.FilterID)
log.Error(fmt.Sprintf(info))
return errors.New(info)
} else if sz == 1 {
params.Topic = filter.Topics[0]
} else {
// choose randomly
rnd := mathrand.Intn(sz)
params.Topic = filter.Topics[rnd]
}
}
}
// validate
if len(args.KeyName) != 0 && len(params.KeySym) == 0 {
info := "Post: key was not found by name: " + args.KeyName
log.Error(fmt.Sprintf(info))
return errors.New(info)
}
if len(args.To) == 0 && len(params.KeySym) == 0 {
info := "Post: message must be encrypted either symmetrically or asymmetrically"
log.Error(fmt.Sprintf(info))
return errors.New(info)
}
if len(args.To) != 0 && len(params.KeySym) != 0 {
info := "Post: ambigous encryption method requested"
log.Error(fmt.Sprintf(info))
return errors.New(info)
}
if len(args.To) > 0 {
if !ValidatePublicKey(params.Dst) {
info := "Post: Invalid 'To' address"
log.Error(fmt.Sprintf(info))
return errors.New(info)
}
}
// encrypt and send
message := NewSentMessage(&params)
envelope, err := message.Wrap(&params)
if err != nil {
log.Error(fmt.Sprintf(err.Error()))
return err
}
if len(envelope.Data) > MaxMessageLength {
info := "Post: message is too big"
log.Error(fmt.Sprintf(info))
return errors.New(info)
}
if (envelope.Topic == TopicType{} && envelope.IsSymmetric()) {
info := "Post: topic is missing for symmetric encryption"
log.Error(fmt.Sprintf(info))
return errors.New(info)
}
if args.PeerID != nil {
return api.whisper.SendP2PMessage(args.PeerID, envelope)
}
return api.whisper.Send(envelope)
}
type PostArgs struct {
TTL uint32 `json:"ttl"`
From string `json:"from"`
To string `json:"to"`
KeyName string `json:"keyname"`
Topic TopicType `json:"topic"`
Padding hexutil.Bytes `json:"padding"`
Payload hexutil.Bytes `json:"payload"`
WorkTime uint32 `json:"worktime"`
PoW float64 `json:"pow"`
FilterID string `json:"filterID"`
PeerID hexutil.Bytes `json:"peerID"`
}
type WhisperFilterArgs struct {
To string `json:"to"`
From string `json:"from"`
KeyName string `json:"keyname"`
PoW float64 `json:"pow"`
Topics []TopicType `json:"topics"`
AcceptP2P bool `json:"p2p"`
}
// UnmarshalJSON implements the json.Unmarshaler interface, invoked to convert a
// JSON message blob into a WhisperFilterArgs structure.
func (args *WhisperFilterArgs) UnmarshalJSON(b []byte) (err error) {
// Unmarshal the JSON message and sanity check
var obj struct {
To string `json:"to"`
From string `json:"from"`
KeyName string `json:"keyname"`
PoW float64 `json:"pow"`
Topics []interface{} `json:"topics"`
AcceptP2P bool `json:"p2p"`
}
if err := json.Unmarshal(b, &obj); err != nil {
return err
}
args.To = obj.To
args.From = obj.From
args.KeyName = obj.KeyName
args.PoW = obj.PoW
args.AcceptP2P = obj.AcceptP2P
// Construct the topic array
if obj.Topics != nil {
topics := make([]string, len(obj.Topics))
for i, field := range obj.Topics {
switch value := field.(type) {
case string:
topics[i] = value
case nil:
return fmt.Errorf("topic[%d] is empty", i)
default:
return fmt.Errorf("topic[%d] is not a string", i)
}
}
topicsDecoded := make([]TopicType, len(topics))
for j, s := range topics {
x := common.FromHex(s)
if x == nil || len(x) != TopicLength {
return fmt.Errorf("topic[%d] is invalid", j)
}
topicsDecoded[j] = BytesToTopic(x)
}
args.Topics = topicsDecoded
}
return nil
}
// WhisperMessage is the RPC representation of a whisper message.
type WhisperMessage struct {
Topic string `json:"topic"`
Payload string `json:"payload"`
Padding string `json:"padding"`
From string `json:"from"`
To string `json:"to"`
Sent uint32 `json:"sent"`
TTL uint32 `json:"ttl"`
PoW float64 `json:"pow"`
Hash string `json:"hash"`
}
// NewWhisperMessage converts an internal message into an API version.
func NewWhisperMessage(message *ReceivedMessage) *WhisperMessage {
msg := WhisperMessage{
Topic: common.ToHex(message.Topic[:]),
Payload: common.ToHex(message.Payload),
Padding: common.ToHex(message.Padding),
Sent: message.Sent,
TTL: message.TTL,
PoW: message.PoW,
Hash: common.ToHex(message.EnvelopeHash.Bytes()),
}
if message.Dst != nil {
msg.To = common.ToHex(crypto.FromECDSAPub(message.Dst))
}
if isMessageSigned(message.Raw[0]) {
msg.From = common.ToHex(crypto.FromECDSAPub(message.SigToPubKey()))
}
return &msg
}