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cmd_username.go
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cmd_username.go
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package main
import (
"encoding/json"
"errors"
"flag"
"fmt"
"io"
"net/http"
"github.com/iov-one/weave"
app "github.com/iov-one/weave/app"
bnsd "github.com/iov-one/weave/cmd/bnsd/app"
"github.com/iov-one/weave/cmd/bnsd/x/username"
)
func cmdRegisterUsername(input io.Reader, output io.Writer, args []string) error {
fl := flag.NewFlagSet("", flag.ExitOnError)
fl.Usage = func() {
fmt.Fprintln(flag.CommandLine.Output(), `
Create a transaction for registering a username.
`)
fl.PrintDefaults()
}
var (
nameFl = fl.String("name", "", "Name part of the username. For example 'alice'")
namespaceFl = fl.String("ns", "iov", "Namespace (domain) part of the username. For example 'iov'")
blockchainFl = fl.String("bc", "", "Blockchain network ID.")
addressFl = fl.String("addr", "", "String representation of the blochain address on this network.")
)
fl.Parse(args)
target := username.BlockchainAddress{
BlockchainID: *blockchainFl,
Address: *addressFl,
}
if err := target.Validate(); err != nil {
return fmt.Errorf("given data produce an invalid target: %s", err)
}
msg := username.RegisterTokenMsg{
Metadata: &weave.Metadata{Schema: 1},
Username: *nameFl + "*" + *namespaceFl,
Targets: []username.BlockchainAddress{target},
}
if err := msg.Validate(); err != nil {
return fmt.Errorf("given data produce an invalid message: %s", err)
}
tx := &bnsd.Tx{
Sum: &bnsd.Tx_UsernameRegisterTokenMsg{
UsernameRegisterTokenMsg: &msg,
},
}
_, err := writeTx(output, tx)
return err
}
func cmdResolveUsername(input io.Reader, output io.Writer, args []string) error {
fl := flag.NewFlagSet("", flag.ExitOnError)
fl.Usage = func() {
fmt.Fprintln(flag.CommandLine.Output(), `
Query a node to resolve the username. Successful result outputs a JSON
serialized representation of the resolved username.
`)
fl.PrintDefaults()
}
var (
tmAddrFl = fl.String("tm", env("BNSCLI_TM_ADDR", "https://bns.NETWORK.iov.one:443"),
"Tendermint node address. Use proper NETWORK name. You can use BNSCLI_TM_ADDR environment variable to set it.")
nameFl = fl.String("name", "", "Name part of the username. For example 'alice'")
namespaceFl = fl.String("ns", "iov", "Namespace (domain) part of the username. For example 'iov'")
)
fl.Parse(args)
token, err := fetchUsernameToken(*tmAddrFl, *nameFl+"*"+*namespaceFl)
if err != nil {
return fmt.Errorf("cannot fetch token: %s", err)
}
raw, err := json.MarshalIndent(token, "", "\t")
if err != nil {
return fmt.Errorf("cannot json serialize token information: %s", err)
}
_, err = output.Write(raw)
return err
}
func fetchUsernameToken(serverURL string, uname string) (*username.Token, error) {
resp, err := http.Get(serverURL + "/abci_query?path=%22/usernames%22&data=%22" + uname + "%22")
if err != nil {
return nil, fmt.Errorf("cannot fetch: %s", err)
}
defer resp.Body.Close()
var payload struct {
Result struct {
Response struct {
Value []byte
}
}
}
if err := json.NewDecoder(resp.Body).Decode(&payload); err != nil {
return nil, fmt.Errorf("cannot decode response: %s", err)
}
var values app.ResultSet
if err := values.Unmarshal(payload.Result.Response.Value); err != nil {
return nil, fmt.Errorf("cannot unmarshal values: %s", err)
}
switch n := len(values.Results); {
case n == 0:
return nil, errors.New("username not found")
case n == 1:
// All good.
default:
return nil, fmt.Errorf("expected single result, got %d", n)
}
var token username.Token
if err := token.Unmarshal(values.Results[0]); err != nil {
return nil, fmt.Errorf("cannot unmarshal token: %s", err)
}
return &token, nil
}
func cmdWithBlockchainAddress(input io.Reader, output io.Writer, args []string) error {
fl := flag.NewFlagSet("", flag.ExitOnError)
fl.Usage = func() {
fmt.Fprintln(flag.CommandLine.Output(), `
Attach a blockchain address information to given transaction.
This functionality is intended to extend RegisterTokenMsg or ChangeTokenTargetsMsg.
`)
fl.PrintDefaults()
}
var (
blockchainFl = fl.String("bc", "", "Blockchain network ID.")
addressFl = fl.String("addr", "", "String representation of the blochain address on this network.")
)
fl.Parse(args)
tx, _, err := readTx(input)
if err != nil {
return fmt.Errorf("cannot read input transaction: %s", err)
}
msg, err := tx.GetMsg()
if err != nil {
return fmt.Errorf("cannot extract message from the transaction: %s", err)
}
switch msg := msg.(type) {
case *username.RegisterTokenMsg:
msg.Targets = append(msg.Targets, username.BlockchainAddress{
BlockchainID: *blockchainFl,
Address: *addressFl,
})
case *username.ChangeTokenTargetsMsg:
msg.NewTargets = append(msg.NewTargets, username.BlockchainAddress{
BlockchainID: *blockchainFl,
Address: *addressFl,
})
default:
return fmt.Errorf("unsupported transaction message: %T", msg)
}
// Serialize back the transaction from the input. It was modified.
_, err = writeTx(output, tx)
return err
}