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"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/p2p/discover"
)
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
}
// Info returns the Whisper statistics for diagnostics.
func (api *PublicWhisperAPI) Info() (string, error) {
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if api.whisper == nil {
return "", whisperOfflineErr
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}
return api.whisper.Stats(), nil
}
// SetMaxMessageLength sets the maximal message length allowed by this node
func (api *PublicWhisperAPI) SetMaxMessageLength(val int) error {
if api.whisper == nil {
return whisperOfflineErr
}
return api.whisper.SetMaxMessageLength(val)
}
// SetMinimumPoW sets the minimal PoW required by this node
func (api *PublicWhisperAPI) SetMinimumPoW(val float64) error {
if api.whisper == nil {
return whisperOfflineErr
}
return api.whisper.SetMinimumPoW(val)
}
// AllowP2PMessagesFromPeer marks specific peer trusted, which will allow it
// to send historic (expired) messages.
func (api *PublicWhisperAPI) AllowP2PMessagesFromPeer(enode string) error {
if api.whisper == nil {
return whisperOfflineErr
}
n, err := discover.ParseNode(enode)
if err != nil {
return errors.New("failed to parse enode of trusted peer: " + err.Error())
}
return api.whisper.AllowP2PMessagesFromPeer(n.ID[:])
}
// HasKeyPair checks if the whisper node is configured with the private key
// of the specified public pair.
func (api *PublicWhisperAPI) HasKeyPair(id string) (bool, error) {
if api.whisper == nil {
return false, whisperOfflineErr
}
return api.whisper.HasKeyPair(id), nil
}
// DeleteKeyPair deletes the specifies key if it exists.
func (api *PublicWhisperAPI) DeleteKeyPair(id string) (bool, error) {
if api.whisper == nil {
return false, whisperOfflineErr
}
return api.whisper.DeleteKeyPair(id), nil
}
// NewKeyPair generates a new cryptographic identity for the client, and injects
// it into the known identities for message decryption.
func (api *PublicWhisperAPI) NewKeyPair() (string, error) {
if api.whisper == nil {
return "", whisperOfflineErr
}
return api.whisper.NewKeyPair()
}
// GetPublicKey returns the public key for identity id
func (api *PublicWhisperAPI) GetPublicKey(id string) (hexutil.Bytes, error) {
if api.whisper == nil {
return nil, whisperOfflineErr
}
key, err := api.whisper.GetPrivateKey(id)
if err != nil {
return nil, err
}
return crypto.FromECDSAPub(&key.PublicKey), nil
}
// GetPrivateKey returns the private key for identity id
func (api *PublicWhisperAPI) GetPrivateKey(id string) (string, error) {
if api.whisper == nil {
return "", whisperOfflineErr
}
key, err := api.whisper.GetPrivateKey(id)
if err != nil {
return "", err
}
return common.ToHex(crypto.FromECDSA(key)), nil
}
// GenerateSymmetricKey generates a random symmetric key and stores it under id,
// which is then returned. Will be used in the future for session key exchange.
func (api *PublicWhisperAPI) GenerateSymmetricKey() (string, error) {
if api.whisper == nil {
return "", whisperOfflineErr
}
return api.whisper.GenerateSymKey()
}
// AddSymmetricKeyDirect stores the key, and returns its id.
func (api *PublicWhisperAPI) AddSymmetricKeyDirect(key hexutil.Bytes) (string, error) {
if api.whisper == nil {
return "", whisperOfflineErr
}
return api.whisper.AddSymKeyDirect(key)
}
// AddSymmetricKeyFromPassword generates the key from password, stores it, and returns its id.
func (api *PublicWhisperAPI) AddSymmetricKeyFromPassword(password string) (string, error) {
if api.whisper == nil {
return "", whisperOfflineErr
}
return api.whisper.AddSymKeyFromPassword(password)
}
// HasSymmetricKey returns true if there is a key associated with the given id.
// Otherwise returns false.
func (api *PublicWhisperAPI) HasSymmetricKey(id string) (bool, error) {
if api.whisper == nil {
return false, whisperOfflineErr
}
res := api.whisper.HasSymKey(id)
return res, nil
}
// GetSymmetricKey returns the symmetric key associated with the given id.
func (api *PublicWhisperAPI) GetSymmetricKey(name string) (hexutil.Bytes, error) {
if api.whisper == nil {
return nil, whisperOfflineErr
}
b, err := api.whisper.GetSymKey(name)
if err != nil {
return nil, err
}
return b, nil
}
// DeleteSymmetricKey deletes the key associated with the name string if it exists.
func (api *PublicWhisperAPI) DeleteSymmetricKey(name string) (bool, error) {
if api.whisper == nil {
return false, whisperOfflineErr
}
res := api.whisper.DeleteSymKey(name)
return res, nil
}
// Subscribe creates and registers a new filter to watch for inbound whisper messages.
// Returns the ID of the newly created filter.
func (api *PublicWhisperAPI) Subscribe(args WhisperFilterArgs) (string, error) {
if api.whisper == nil {
return "", whisperOfflineErr
}
filter := Filter{
PoW: args.MinPoW,
Messages: make(map[common.Hash]*ReceivedMessage),
AllowP2P: args.AllowP2P,
}
var err error
for i, bt := range args.Topics {
if len(bt) == 0 || len(bt) > 4 {
return "", errors.New(fmt.Sprintf("subscribe: topic %d has wrong size: %d", i, len(bt)))
}
filter.Topics = append(filter.Topics, bt)
}
if err = ValidateKeyID(args.Key); err != nil {
return "", errors.New("subscribe: " + err.Error())
}
if len(args.SignedWith) > 0 {
sb := common.FromHex(args.SignedWith)
if sb == nil {
return "", errors.New("subscribe: SignedWith parameter is invalid")
}
filter.Src = crypto.ToECDSAPub(sb)
if !ValidatePublicKey(filter.Src) {
return "", errors.New("subscribe: invalid 'SignedWith' field")
}
}
if args.Symmetric {
if len(args.Topics) == 0 {
return "", errors.New("subscribe: at least one topic must be specified with symmetric encryption")
}
symKey, err := api.whisper.GetSymKey(args.Key)
if err != nil {
return "", errors.New("subscribe: invalid key ID")
}
if !validateSymmetricKey(symKey) {
return "", errors.New("subscribe: retrieved key is invalid")
}
filter.KeySym = symKey
filter.SymKeyHash = crypto.Keccak256Hash(filter.KeySym)
} else {
filter.KeyAsym, err = api.whisper.GetPrivateKey(args.Key)
if err != nil {
return "", errors.New("subscribe: invalid key ID")
}
if filter.KeyAsym == nil {
return "", errors.New("subscribe: non-existent identity provided")
}
}
return api.whisper.Subscribe(&filter)
}
// Unsubscribe disables and removes an existing filter.
func (api *PublicWhisperAPI) Unsubscribe(id string) {
api.whisper.Unsubscribe(id)
}
// GetSubscriptionMessages retrieves all the new messages matched by the corresponding
// subscription filter since the last retrieval.
func (api *PublicWhisperAPI) GetNewSubscriptionMessages(id string) []*WhisperMessage {
f := api.whisper.GetFilter(id)
if f != nil {
newMail := f.Retrieve()
return toWhisperMessages(newMail)
}
return toWhisperMessages(nil)
}
// GetMessages retrieves all the floating messages that match a specific subscription filter.
// It is likely to be called once per session, right after Subscribe call.
func (api *PublicWhisperAPI) GetFloatingMessages(id string) []*WhisperMessage {
all := api.whisper.Messages(id)
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
}
var err error
params := MessageParams{
TTL: args.TTL,
WorkTime: args.PowTime,
PoW: args.PowTarget,
Payload: args.Payload,
Padding: args.Padding,
}
if len(args.Key) == 0 {
return errors.New("post: key is missing")
}
if len(args.SignWith) > 0 {
params.Src, err = api.whisper.GetPrivateKey(args.SignWith)
if err != nil {
return err
}
if params.Src == nil {
return errors.New("post: empty identity")
}
}
if len(args.Topic) == TopicLength {
params.Topic = BytesToTopic(args.Topic)
} else if len(args.Topic) != 0 {
return errors.New(fmt.Sprintf("post: wrong topic size %d", len(args.Topic)))
}
if args.Type == "sym" {
if err = ValidateKeyID(args.Key); err != nil {
return err
}
params.KeySym, err = api.whisper.GetSymKey(args.Key)
if err != nil {
return err
}
if !validateSymmetricKey(params.KeySym) {
return errors.New("post: key for symmetric encryption is invalid")
}
if len(params.Topic) == 0 {
return errors.New("post: topic is missing for symmetric encryption")
}
} else if args.Type == "asym" {
kb := common.FromHex(args.Key)
if kb == nil {
return errors.New("post: public key for asymmetric encryption is invalid")
}
params.Dst = crypto.ToECDSAPub(kb)
if !ValidatePublicKey(params.Dst) {
return errors.New("post: public key for asymmetric encryption is invalid")
}
} else {
return errors.New("post: wrong type (sym/asym)")
}
// encrypt and send
message, err := NewSentMessage(&params)
if err != nil {
return err
}
envelope, err := message.Wrap(&params)
if err != nil {
return err
}
if envelope.size() > api.whisper.maxMsgLength {
return errors.New("post: message is too big")
}
if len(args.TargetPeer) != 0 {
n, err := discover.ParseNode(args.TargetPeer)
if err != nil {
return errors.New("post: failed to parse enode of target peer: " + err.Error())
}
return api.whisper.SendP2PMessage(n.ID[:], envelope)
} else if args.PowTarget < api.whisper.minPoW {
return errors.New("post: target PoW is less than minimum PoW, the message can not be sent")
}
return api.whisper.Send(envelope)
}
type PostArgs struct {
Type string `json:"type"` // "sym"/"asym" (symmetric or asymmetric)
TTL uint32 `json:"ttl"` // time-to-live in seconds
SignWith string `json:"signWith"` // id of the signing key
Key string `json:"key"` // key id (in case of sym) or public key (in case of asym)
Topic hexutil.Bytes `json:"topic"` // topic (4 bytes)
Padding hexutil.Bytes `json:"padding"` // optional padding bytes
Payload hexutil.Bytes `json:"payload"` // payload to be encrypted
PowTime uint32 `json:"powTime"` // maximal time in seconds to be spent on PoW
PowTarget float64 `json:"powTarget"` // minimal PoW required for this message
TargetPeer string `json:"targetPeer"` // peer id (for p2p message only)
}
type WhisperFilterArgs struct {
Symmetric bool // encryption type
Key string // id of the key to be used for decryption
SignedWith string // public key of the sender to be verified
MinPoW float64 // minimal PoW requirement
Topics [][]byte // list of topics (up to 4 bytes each) to match
AllowP2P bool // indicates wheather direct p2p messages are allowed for this filter
}
// 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 {
Type string `json:"type"`
Key string `json:"key"`
SignedWith string `json:"signedWith"`
MinPoW float64 `json:"minPoW"`
Topics []interface{} `json:"topics"`
AllowP2P bool `json:"allowP2P"`
}
if err := json.Unmarshal(b, &obj); err != nil {
return err
}
switch obj.Type {
case "sym":
args.Symmetric = true
case "asym":
args.Symmetric = false
default:
return errors.New("wrong type (sym/asym)")
}
args.Key = obj.Key
args.SignedWith = obj.SignedWith
args.MinPoW = obj.MinPoW
args.AllowP2P = obj.AllowP2P
// 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([][]byte, 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] = 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"`
Src string `json:"signedWith"`
Dst string `json:"recipientPublicKey"`
Timestamp uint32 `json:"timestamp"`
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{
Payload: common.ToHex(message.Payload),
Padding: common.ToHex(message.Padding),
Timestamp: message.Sent,
TTL: message.TTL,
PoW: message.PoW,
Hash: common.ToHex(message.EnvelopeHash.Bytes()),
}
if len(message.Topic) == TopicLength {
msg.Topic = common.ToHex(message.Topic[:])
}
if message.Dst != nil {
b := crypto.FromECDSAPub(message.Dst)
if b != nil {
msg.Dst = common.ToHex(b)
}
}
if isMessageSigned(message.Raw[0]) {
b := crypto.FromECDSAPub(message.SigToPubKey())
if b != nil {
msg.Src = common.ToHex(b)
}
}
return &msg
}