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server.go
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server.go
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package main
import (
"encoding/hex"
"encoding/json"
"fmt"
"github.com/btcsuite/btcd/btcec"
"github.com/btcsuite/btcd/chaincfg"
"github.com/btcsuite/btcutil/hdkeychain"
"github.com/jayt106/bitcoinAddressGenerator/cipher"
"io/ioutil"
"log"
"net/http"
"os"
"os/signal"
"strconv"
"strings"
"syscall"
)
func main() {
// the ctr + c signal event handle
handleCtrlC()
log.Println("The server is running...")
// Generate the key for the data encrypt/decrypt during the message passing
privKey, err := btcec.NewPrivateKey(btcec.S256())
if err != nil {
panic(err)
}
//Create the default mux
mux := http.NewServeMux()
//Handling the /v1/serverPublicKeys.
pubkh := &PubKeyHandler{privKey.PubKey()}
mux.Handle("/v1/serverPublicKeys", pubkh)
//Handling the /v1/genPublicKeyAndSegWitAddress.
privkh := &PrivKeyHandler{privKey}
mux.Handle("/v1/genPublicKeyAndSegWitAddress", privkh)
//Handling the /v1/genMultiSigP2SH address
mux.HandleFunc("/v1/genMultiSigP2SHAddress", GenMultiSigP2SHAddress)
//Create the http server.
s := &http.Server{
Addr: ":8080",
Handler: mux,
}
// Start the server
err = s.ListenAndServe()
if err != nil {
log.Println(err)
}
}
func handleCtrlC() {
c := make(chan os.Signal)
signal.Notify(c, os.Interrupt, syscall.SIGTERM)
go func() {
<-c
shutdown()
os.Exit(1)
}()
}
func shutdown() {
fmt.Println()
log.Println("The server is terminated")
}
// PubKeyHandler the handler uses for passing this struct into the ServerHTTP function
type PubKeyHandler struct {
pubKey *btcec.PublicKey
}
// ServeHTTP handle the V1/serverPublicKeys API request. Return the server public key for encrypting the client data
func (ph *PubKeyHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
log.Println("Handle API /v1/serverPublicKeys")
resp := make(map[string]string)
resp["publicKey"] = hex.EncodeToString(ph.pubKey.SerializeCompressed())
jsonResp, err := json.Marshal(resp)
if err != nil {
log.Println("Json Marshal error:", err)
w.WriteHeader(500)
} else {
w.WriteHeader(200)
}
w.Header().Set("Content-Type", "application/json")
_, err = w.Write(jsonResp)
if err != nil {
log.Println("ServeHTTP write error:", err)
}
}
type PrivKeyHandler struct {
privKey *btcec.PrivateKey
}
// ServeHTTP handle the V1/genPublicKeyAndSegWitAddress API request.
// The http client send the seed, path and the public key(for the return message encryption) encrypted by the server's public key
// (See V1/serverPublicKeys API). This function decrypted the message by the server's private key, generate the HD key base on the
// seed and the path and return the public key and the SegWit address encrypted by the client's public key.
func (ph *PrivKeyHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
log.Println("Handle API /v1/genPublicKeyAndSegWitAddress")
body, err := ioutil.ReadAll(r.Body)
if err != nil {
ServerErrorHandle(w, err, "Read body error:")
return
}
msgParam := make(map[string]string)
err = json.Unmarshal(body, &msgParam)
if err != nil {
ServerErrorHandle(w, err, "Json unmarshal error:")
return
}
cipherBytes, err := hex.DecodeString(msgParam["data"])
if err != nil {
ServerErrorHandle(w, err, "Hex decode string error:")
return
}
plainBytes, err := cipher.MessageDecrypt(ph.privKey, &cipherBytes)
if err != nil {
ServerErrorHandle(w, err, "Decrypt data error:")
return
}
slice := *plainBytes
clientCipherPublicKey := slice[:btcec.PubKeyBytesLenCompressed]
keyPath := slice[btcec.PubKeyBytesLenCompressed:]
Clear(plainBytes)
Clear(&slice)
var keyParam BIP32PARAM
err = json.Unmarshal(keyPath, &keyParam)
Clear(&keyPath)
if err != nil {
ServerErrorHandle(w, err, "Unmarshal data error:")
return
}
// Generate a HD key chain (Bitcoin mainnet) using the seed.
clientHDPubKey, err := GenerateHDPublicKey(&keyParam)
Clear(&keyParam)
if err != nil {
ServerErrorHandle(w, err, "Generate HD public key failed:")
return
}
compressedPubKey, err := ConvertPublicKey(clientHDPubKey)
if err != nil {
ServerErrorHandle(w, err, "Convert HD public key failed:")
return
}
segwitAddress, err := GenerateSegwitAddress(compressedPubKey)
if err != nil {
ServerErrorHandle(w, err, "Generate segwit address failed:")
return
}
resp := make(map[string]string)
resp["publicKey"] = hex.EncodeToString(*compressedPubKey)
resp["segwitAddress"] = *segwitAddress
marshalledData, err := json.Marshal(resp)
if err != nil {
ServerErrorHandle(w, err, "Json Marshal error:")
return
}
pubKey, err := btcec.ParsePubKey(clientCipherPublicKey, btcec.S256())
if err != nil {
ServerErrorHandle(w, err, "ParsePubKey error:")
return
}
cipherText, err := cipher.MessageEncrypt(pubKey, &marshalledData)
if err != nil {
ServerErrorHandle(w, err, "MessageEncrypt error:")
return
}
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(200)
_, err = w.Write(*cipherText)
if err != nil {
log.Println("ServeHTTP write error:", err)
}
}
// ServerErrorHandle Handle the response message when the error happens during the HTTP request processing
func ServerErrorHandle(w http.ResponseWriter, e error, s string) {
log.Println(s, e)
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(500)
}
// GenerateHDPublicKey Generate a bitcoin mainnet HD public key given the seed and path following by BIP032
func GenerateHDPublicKey(p *BIP32PARAM) (*hdkeychain.ExtendedKey, error){
seed, err := hex.DecodeString(p.SEED)
if err != nil {
return nil, err
}
clientMasterKey, err := hdkeychain.NewMaster(seed, &chaincfg.MainNetParams)
Clear(&seed)
if err != nil {
return nil, err
}
accKey, err := clientMasterKey.Derive(hdkeychain.HardenedKeyStart + p.PATH.ACCOUNT)
Clear(&clientMasterKey)
if err != nil {
return nil, err
}
chainKey, err := accKey.Derive(p.PATH.CHAIN)
if err != nil {
return nil, err
}
addressKey, err := chainKey.Derive(p.PATH.ADDRESS)
if err != nil {
return nil, err
}
clientHDPubKey, err := addressKey.Neuter()
if err != nil {
return nil, err
}
return clientHDPubKey, nil
}
// HandleMultiSigP2SHAddress a handle function to genarate the n-out-of-m MultiSig P2SH bitcoin Address
func GenMultiSigP2SHAddress(w http.ResponseWriter, r *http.Request) {
log.Println("Handle API /v1/genMultiSigP2SHAddress")
body, err := ioutil.ReadAll(r.Body)
if err != nil {
ServerErrorHandle(w, err, "Read body error:")
return
}
var msgParam map[string]string
err = json.Unmarshal(body, &msgParam)
if err != nil {
ServerErrorHandle(w, err, "Json unmarshal error:")
return
}
n, err := strconv.ParseInt(msgParam["n"], 10, 32)
if err != nil {
ServerErrorHandle(w, err, "The argument n parsing error:")
return
}
m, err := strconv.ParseInt(msgParam["m"], 10, 32)
if err != nil {
ServerErrorHandle(w, err, "The argument m parsing error:")
return
}
publicKeys := msgParam["publicKeys"]
// the client input requirement is n-of-m multisig. Therefore, the order of the param for calling the following function
// need to be careful
P2SHAddress, redeemScriptHex, err := cipher.OutputAddress(int(n), int(m), publicKeys)
resp := make(map[string]string)
if err != nil {
errString := err.Error()
if !strings.Contains(errString, "WARNING:") {
ServerErrorHandle(w, err, "P2SH Address generating error:")
return
}
resp["warning"] = errString
}
resp["ps2hAddress"] = P2SHAddress
resp["redeemScriptHex"] = redeemScriptHex
marshalledData, err := json.Marshal(resp)
if err != nil {
log.Println("Json Marshal error:", err)
w.WriteHeader(500)
} else {
w.WriteHeader(200)
}
w.Header().Set("Content-Type", "application/json")
_, err = w.Write(marshalledData)
if err != nil {
log.Println("ServeHTTP write error:", err)
}
}