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main.go
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main.go
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package main
import (
"bytes"
"encoding/binary"
"encoding/hex"
"fmt"
"os"
"strings"
"time"
cli "github.com/urfave/cli"
rpc "github.com/whyrusleeping/zmsg/rpc"
)
var Verbose = false
type Message struct {
To string
Timestamp time.Time
Content string
Val float64
}
func getMyAddresses() ([]string, error) {
req := &rpc.Request{
Method: "z_listaddresses",
}
var out struct {
Result []string
}
err := rpc.Do(req, &out)
if err != nil {
return nil, err
}
return out.Result, nil
}
type TxDesc struct {
Txid string
Amount float64
Memo string
}
func parseTypedData(d []byte) (uint64, []byte, error) {
mtyp, n1 := binary.Uvarint(d)
mlen, n2 := binary.Uvarint(d[n1:])
if 1+n1+n2+int(mlen) > 512 {
return 0, nil, fmt.Errorf("specified message length exceeded limit")
}
return mtyp, d[n1+n2 : n1+n2+int(mlen)], nil
}
// getReceivedForAddr returns all received messages for a given address
func getReceivedForAddr(addr string, noconf bool) ([]*Message, error) {
req := &rpc.Request{
Method: "z_listreceivedbyaddress",
}
params := []interface{}{addr}
if noconf {
params = append(params, 0)
}
req.Params = params
var out struct {
Result []*TxDesc
}
err := rpc.Do(req, &out)
if err != nil {
return nil, err
}
var msgs []*Message
for _, txd := range out.Result {
decmemo, err := hex.DecodeString(txd.Memo)
if err != nil {
return nil, err
}
var content string
switch {
case decmemo[0] == 0xff:
if Verbose {
fmt.Println(" == warning: memo contained unformatted data")
}
continue
default:
if Verbose {
fmt.Printf(" == warning: memo contained data marked with future protocol extension codes (%d)\n", decmemo[0])
}
continue
case decmemo[0] == 0xf5:
// typed length prefixed data
mtyp, buf, err := parseTypedData(decmemo[1:])
if err != nil {
return nil, err
}
// 0xa0 == ascii type flag
if mtyp != 0xa0 {
if Verbose {
fmt.Println(" == warning: can only handle type of 'ascii' (0xa0)")
}
continue
}
content = string(buf)
case decmemo[0] <= 0xf4:
// acceptable, utf encoded text
content = string(bytes.TrimRight(decmemo, "\x00"))
}
tx, err := getTransaction(txd.Txid)
if err != nil {
return nil, err
}
msg := &Message{
Timestamp: time.Unix(tx.Time, 0),
Val: txd.Amount,
Content: content,
To: addr,
}
msgs = append(msgs, msg)
}
return msgs, nil
}
// CheckMessages returns all messages that the local zcash daemon has received
func CheckMessages(noconf bool) ([]*Message, error) {
addrs, err := getMyAddresses()
if err != nil {
return nil, err
}
var allmsgs []*Message
for _, myaddr := range addrs {
msgs, err := getReceivedForAddr(myaddr, noconf)
if err != nil {
return nil, err
}
allmsgs = append(allmsgs, msgs...)
}
return allmsgs, nil
}
var ErrNoAddresses = fmt.Errorf("no addresses to send message from! (create one with the zcash-cli)")
// SendMessage sends a message to a given zcash address using a shielded transaction.
// It returns the transaction ID.
func SendMessage(from, to, msg string, msgval float64) (string, error) {
if from == "" {
// if no from address is specified, use the first local address
myaddrs, err := getMyAddresses()
if err != nil {
return "", err
}
if len(myaddrs) == 0 {
return "", ErrNoAddresses
}
from = myaddrs[0]
fmt.Printf("sending message from %s\n", from)
}
req := &rpc.Request{
Method: "z_sendmany",
Params: []interface{}{
from, // first parameter is address to send from (where the ZEC comes from)
[]interface{}{
map[string]interface{}{
"amount": msgval,
"address": to,
"memo": hex.EncodeToString([]byte(msg)),
},
},
},
}
var out struct {
Result string
}
err := rpc.Do(req, &out)
if err != nil {
return "", err
}
opid := out.Result
txid, err := WaitForOperation(opid)
if err != nil {
return "", err
}
return txid, nil
}
type opStatus struct {
Id string
Status string
CreationTime uint64 `json:"creation_time"`
Error rpc.Error
Result struct {
Txid string
}
}
func checkOperationStatus(opid string) (*opStatus, error) {
req := &rpc.Request{
Method: "z_getoperationstatus",
Params: []interface{}{[]string{opid}},
}
var out struct {
Result []*opStatus
}
err := rpc.Do(req, &out)
if err != nil {
return nil, err
}
return out.Result[0], nil
}
type Transaction struct {
Time int64
Confirmations int
}
func getTransaction(txid string) (*Transaction, error) {
req := &rpc.Request{
Method: "gettransaction",
Params: []string{txid},
}
var out struct {
Result Transaction
}
err := rpc.Do(req, &out)
if err != nil {
return nil, err
}
return &out.Result, nil
}
// WaitForOperation polls the operations status until it either fails or
// succeeds.
func WaitForOperation(opid string) (string, error) {
i := 0
for range time.Tick(time.Second) {
status, err := checkOperationStatus(opid)
if err != nil {
return "", err
}
switch status.Status {
case "failed":
fmt.Println("operation failed!")
fmt.Println("reason: ", status.Error.Message)
return "", fmt.Errorf(status.Error.Message)
case "executing":
// in progress, print a progress thingy?
fmt.Printf("\r \r")
fmt.Print("sending message")
for j := 0; j <= (i % 4); j++ {
fmt.Print(".")
}
case "success":
fmt.Println("\nMessage sent successfuly!")
return status.Result.Txid, nil
default:
fmt.Printf("%#v\n", status)
}
i++
}
return "", nil
}
var CheckCmd = cli.Command{
Name: "check",
Usage: "check for messages.",
Flags: []cli.Flag{
cli.BoolFlag{
Name: "verbose",
Usage: "enable verbose log output",
},
cli.BoolFlag{
Name: "noconf",
Usage: "show messages with no transaction confirmations",
},
},
Action: func(c *cli.Context) error {
Verbose = c.Bool("verbose")
msgs, err := CheckMessages(c.Bool("noconf"))
if err != nil {
return err
}
div := strings.Repeat("=", 80)
fmt.Println(div)
fmt.Printf("> Got %d messages.\n", len(msgs))
fmt.Println(div)
for i, m := range msgs {
fmt.Printf("| Message #%d (val = %f)\n", i, m.Val)
fmt.Printf("| To: %s\n", m.To)
fmt.Printf("| Date: %s\n|\n", m.Timestamp)
fmt.Println("| ", strings.Replace(m.Content, "\n", "\n| ", -1))
fmt.Println(div)
}
return nil
},
}
var SendCmd = cli.Command{
Name: "sendmsg",
Usage: "send a message to another zmsg user.",
Flags: []cli.Flag{
cli.StringFlag{
Name: "from",
Usage: "address to send message from",
},
cli.StringFlag{
Name: "to",
Usage: "address to send message to",
},
cli.Float64Flag{
Name: "txval",
Value: 0.00001,
Usage: "specify the amount of ZEC to send with messages.",
},
},
Action: func(c *cli.Context) error {
to := c.String("to")
from := c.String("from")
msg := strings.Join(c.Args(), " ")
if to == "" {
return fmt.Errorf("please specify an address to send the message to")
}
if msg == "" {
return fmt.Errorf("no message specified")
}
fmt.Printf("message: %q\n", msg)
txid, err := SendMessage(from, to, msg, c.Float64("txval"))
if err != nil {
return err
}
fmt.Printf("message sent! (txid = %s)\n", txid)
return nil
},
}
func main() {
app := cli.NewApp()
app.Version = "0.1.0"
app.Author = "whyrusleeping"
app.Email = "why@ipfs.io"
app.Usage = "send and receive zero knowledge messages"
app.Commands = []cli.Command{
CheckCmd,
SendCmd,
}
err := app.Run(os.Args)
if err != nil {
fmt.Println("Error: ", err)
os.Exit(1)
}
}