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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 api
import (
"crypto/ecdsa"
"encoding/json"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/contracts/ens"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/swarm/network"
"github.com/ethereum/go-ethereum/swarm/services/swap"
"github.com/ethereum/go-ethereum/swarm/storage"
)
const (
DefaultHTTPListenAddr = "127.0.0.1"
DefaultHTTPPort = "8500"
)
// separate bzz directories
// allow several bzz nodes running in parallel
type Config struct {
// serialised/persisted fields
*storage.StoreParams
*storage.ChunkerParams
*network.HiveParams
Swap *swap.SwapParams
*network.SyncParams
Path string
ListenAddr string
Port string
PublicKey string
BzzKey string
EnsRoot common.Address
NetworkId uint64
}
// config is agnostic to where private key is coming from
// so managing accounts is outside swarm and left to wrappers
func NewConfig(path string, contract common.Address, prvKey *ecdsa.PrivateKey, networkId uint64) (self *Config, err error) {
address := crypto.PubkeyToAddress(prvKey.PublicKey) // default beneficiary address
dirpath := filepath.Join(path, "bzz-"+common.Bytes2Hex(address.Bytes()))
err = os.MkdirAll(dirpath, os.ModePerm)
if err != nil {
return
}
confpath := filepath.Join(dirpath, "config.json")
var data []byte
pubkey := crypto.FromECDSAPub(&prvKey.PublicKey)
pubkeyhex := common.ToHex(pubkey)
keyhex := crypto.Keccak256Hash(pubkey).Hex()
self = &Config{
SyncParams: network.NewSyncParams(dirpath),
HiveParams: network.NewHiveParams(dirpath),
ChunkerParams: storage.NewChunkerParams(),
StoreParams: storage.NewStoreParams(dirpath),
ListenAddr: DefaultHTTPListenAddr,
Port: DefaultHTTPPort,
Path: dirpath,
Swap: swap.DefaultSwapParams(contract, prvKey),
PublicKey: pubkeyhex,
BzzKey: keyhex,
EnsRoot: ens.TestNetAddress,
NetworkId: networkId,
}
data, err = ioutil.ReadFile(confpath)
// if not set in function param, then set default for swarm network, will be overwritten by config file if present
if networkId == 0 {
self.NetworkId = network.NetworkId
}
if err != nil {
if !os.IsNotExist(err) {
return
}
// file does not exist
// write out config file
err = self.Save()
if err != nil {
err = fmt.Errorf("error writing config: %v", err)
}
return
}
// file exists, deserialise
err = json.Unmarshal(data, self)
if err != nil {
return nil, fmt.Errorf("unable to parse config: %v", err)
}
// check public key
if pubkeyhex != self.PublicKey {
return nil, fmt.Errorf("public key does not match the one in the config file %v != %v", pubkeyhex, self.PublicKey)
}
if keyhex != self.BzzKey {
return nil, fmt.Errorf("bzz key does not match the one in the config file %v != %v", keyhex, self.BzzKey)
}
// if set in function param, replace id set from config file
if networkId != 0 {
self.NetworkId = networkId
}
self.Swap.SetKey(prvKey)
if (self.EnsRoot == common.Address{}) {
self.EnsRoot = ens.TestNetAddress
}
return
}
func (self *Config) Save() error {
data, err := json.MarshalIndent(self, "", " ")
if err != nil {
return err
}
err = os.MkdirAll(self.Path, os.ModePerm)
if err != nil {
return err
}
confpath := filepath.Join(self.Path, "config.json")
return ioutil.WriteFile(confpath, data, os.ModePerm)
}
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