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util.go
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util.go
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package main
import (
"context"
"crypto/rand"
"encoding/hex"
"encoding/json"
"fmt"
"io/ioutil"
"os"
"strings"
"github.com/kirsle/configdir"
"github.com/libp2p/go-libp2p-core/peer"
crypto "github.com/libp2p/go-libp2p-crypto"
"github.com/multiformats/go-multiaddr"
log "github.com/sirupsen/logrus"
)
const defaultConfig = `{
"ClusterKey": "f73792a8ba5fa5306039ccd82f79887b3319457752ff0b604fc736c72134e336",
"Bootstrappers": [
"/ip4/35.224.203.143/tcp/4001/p2p/QmfNdsi6tQfuQ1AbiVbTwxziaRCzuamjP711y42mNW33DS"
]
}`
// Configuration is the deserialized version of the json configuration
type Configuration struct {
ClusterKey string
Bootstrappers []string
}
// GetConfig loads the configuration json file
func GetConfig() *Configuration {
configFile := configdir.LocalConfig("spore", "conf.json")
if _, err := os.Stat(configFile); os.IsNotExist(err) {
err := ioutil.WriteFile(configFile, []byte(defaultConfig), 0644)
if err != nil {
log.Error(err)
panic(err)
}
}
file, _ := os.Open(configFile)
defer file.Close()
decoder := json.NewDecoder(file)
configuration := Configuration{}
err := decoder.Decode(&configuration)
if err != nil {
fmt.Println("error:", err)
}
fmt.Println(configuration.Bootstrappers)
return &configuration
}
// ConfigSetup sets up the configuration directory
func ConfigSetup() *Configuration {
// Ensure config directory exists
configPath := configdir.LocalConfig("spore")
er := configdir.MakePath(configPath) // Ensure it exists.
if er != nil {
panic(er)
}
// set up logging
/*
logfile := configdir.LocalConfig("spore", "spore.log")
file, erro := os.OpenFile(logfile, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0666)
if erro == nil {
log.SetOutput(file)
} else {
log.Info("Failed to log to file, using default stderr")
}
*/
log.SetOutput(os.Stdout)
fmt.Println(configPath)
// keyfile
keyfile := configdir.LocalConfig("spore", ".key")
if _, err := os.Stat(keyfile); os.IsNotExist(err) {
createKey()
}
return GetConfig()
}
// GetKey gets the ECDSA private key from the config
// directory
func GetKey() crypto.PrivKey {
keyfile := configdir.LocalConfig("spore", ".key")
// open private key file
content, err := ioutil.ReadFile(keyfile)
if err != nil {
panic(err)
}
hexString := strings.TrimSuffix(string(content), "\n")
decoded, err := hex.DecodeString(hexString)
if err != nil {
panic(err)
}
privNew, err := crypto.UnmarshalPrivateKey(decoded)
if err != nil {
panic(err)
}
return privNew
}
// CreateKey generates a new ECDSA Key Pair and stores it
// in the config directory
func createKey() {
keyfile := configdir.LocalConfig("spore", ".key")
// Create a new ECDSA key pair for this host.
prvKey, _, err := crypto.GenerateECDSAKeyPair(rand.Reader)
if err != nil {
panic(err)
}
privB, err := prvKey.Bytes()
if err != nil {
panic(err)
}
pk := fmt.Sprintf("%x", string(privB))
ioutil.WriteFile(keyfile, []byte(pk), 0644)
fmt.Println("🔑 ECDSA key generated")
}
// ClusterSecret parses the hex-encoded secret string, checks that it is exactly
// 32 bytes long and returns its value as a byte-slice.x
func ClusterSecret() ([]byte, error) {
secret, err := hex.DecodeString(GetConfig().ClusterKey)
if err != nil {
return nil, err
}
switch secretLen := len(secret); secretLen {
case 0:
log.Warning("Cluster secret is empty, cluster will start on unprotected network.")
return nil, nil
case 32:
return secret, nil
default:
return nil, fmt.Errorf("input secret is %d bytes, cluster secret should be 32", secretLen)
}
}
// CollectBootstrapAddrInfos converts bootstrap address in config directory
// to a slice of []peer.AddrInfo
func CollectBootstrapAddrInfos(ctx context.Context) ([]peer.AddrInfo, error) {
bootstrappers := GetConfig().Bootstrappers
if len(bootstrappers) == 0 {
LogInfo("🔔 No bootstrappers defined for this node.")
}
addrInfoSlice := make([]peer.AddrInfo, len(bootstrappers))
for i, s := range bootstrappers {
targetAddr, err := multiaddr.NewMultiaddr(s)
if err != nil {
log.Error(err)
return nil, err
}
targetInfo, err := peer.AddrInfoFromP2pAddr(targetAddr)
if err != nil {
log.Error(err)
return nil, err
}
addrInfoSlice[i] = *targetInfo
LogInfo("🔔 Calling bootstrap node:", s)
}
return addrInfoSlice, nil
}
// LogInfo logs to console and logger
func LogInfo(m string, args ...interface{}) {
fmt.Println(m, args)
log.Info(m, args)
}
// Find takes a slice and looks for an element in it. If found it will
// return it's key, otherwise it will return -1 and a bool of false.
func Find(slice []string, val string) bool {
for _, item := range slice {
if item == val {
return true
}
}
return false
}