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users.go
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users.go
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package services
import (
"bytes"
"encoding/base64"
"encoding/hex"
"errors"
"fmt"
"github.com/meritlabs/achievement-engine/pkg/db/models"
"github.com/meritlabs/achievement-engine/pkg/db/stores"
"github.com/meritlabs/achievement-engine/pkg/utils"
"github.com/btcsuite/btcd/btcec"
"github.com/btcsuite/btcd/chaincfg"
"github.com/btcsuite/btcd/chaincfg/chainhash"
"github.com/btcsuite/btcd/wire"
"github.com/btcsuite/btcutil"
)
// used as a prefix in signmessage method in meritd
const msgMagic = "Merit Signed Message:\n"
// UsersService
type UsersService struct {
NetParams chaincfg.Params
BCClient Client
UsersStore stores.UsersStore
SessionsStore stores.SessionsStore
SettingsStore stores.SettingsStore
ProgressStore stores.ProgressStore
}
/// NEEW
func ParsePubKey(pubkeyHex string) (*btcec.PublicKey, error) {
// Decode hex-encoded pubkey.
pubkeyBytes, err := hex.DecodeString(pubkeyHex)
if err != nil {
return nil, err
}
return btcec.ParsePubKey(pubkeyBytes, btcec.S256())
}
// CheckSignature checks that provided message was signed with the given key
func CheckSignature(message, pubkeyHex, signatureHex, timestamp string, debug bool) error {
msg := message
// append timestamp to the message if not in debug mode.
// useful for testing as timestamp changes signature every second
if !debug {
msg += timestamp
}
var buf bytes.Buffer
wire.WriteVarString(&buf, 0, msgMagic)
wire.WriteVarString(&buf, 0, msg)
messageHash := chainhash.DoubleHashB(buf.Bytes())
pubkey, err := ParsePubKey(pubkeyHex)
if err != nil {
return err
}
// Decode hex-encoded signature.
sigBytes, err := base64.StdEncoding.DecodeString(signatureHex)
if err != nil {
return err
}
pk, _, err := btcec.RecoverCompact(btcec.S256(), sigBytes, messageHash)
if err != nil {
return err
}
if !pubkey.IsEqual(pk) {
return errors.New("invalid signature")
}
return nil
}
// CreateUserWithSignature creates a user with provided pubkey and signature
// TODO: replace pubkey with address
func (s *UsersService) CreateUserWithSignature(message, pubkeyHex, signatureHex, timestamp string, debug bool) (*models.User, error) {
if err := CheckSignature(message, pubkeyHex, signatureHex, timestamp, debug); err != nil {
return nil, err
}
pubkey, err := ParsePubKey(pubkeyHex)
if err != nil {
return nil, err
}
pubkeyHash := btcutil.Hash160(pubkey.SerializeCompressed())
address, err := btcutil.NewAddressPubKeyHash(pubkeyHash, &s.NetParams)
addressStr := address.String()
// Let's look up the user, and insert their information into the context as it flows through the request/response chain.
user := models.User{MeritAddress: addressStr}
if err := s.UsersStore.CreateUserByAddress(addressStr, &user); err != nil {
return nil, err
}
if user.Status != models.Approved && user.Status != models.Banned || user.Status == models.Pending {
// do it synchronous as we need to know that address is valid and confirmed
if err := s.getUserFromBlockchain(&user, pubkeyHex); err != nil {
return nil, err
}
}
s.setUpUserData(&user)
return &user, nil
}
// CreateUserWithPassword create a user with a provided ligin/password pair
func (s *UsersService) CreateUserWithPassword(username, password string) (*models.User, error) {
fmt.Printf("Signup with login/password\n")
return nil, nil
}
// CreateSession create new session for a give user
func (s *UsersService) CreateSession(user models.User) (string, error) {
s.SessionsStore.DeleteSessions(user.ID)
token, err := utils.GenerateRandomString(32)
if err != nil {
return "", err
}
if err := s.SessionsStore.CreateSession(user.ID, token); err != nil {
return "", err
}
return token, nil
}
func (s *UsersService) getUserFromBlockchain(user *models.User, pubkey string) error {
if len(pubkey) == 0 {
return errors.New("empty pubkey")
}
addressInfo, err := s.BCClient.ValidateAddress(user.MeritAddress)
if len(addressInfo.Address) == 0 {
return errors.New("user not found in blockchain")
}
if err != nil {
return err
}
if addressInfo.IsValid {
user.Verified = true
}
if addressInfo.Beaconed > 0 && addressInfo.Confirmed == 0 {
user.Status = models.Pending
}
if addressInfo.Beaconed > 0 && addressInfo.Confirmed > 0 {
user.Status = models.Approved
}
user.MeritAlias = addressInfo.Alias
user.PublicKey = pubkey
return s.UsersStore.CreateUser(user)
}
func (s *UsersService) setUpUserData(user *models.User) error {
settings, err := s.SettingsStore.GetUserSettings(user.ID)
if err != nil {
return err
}
if settings == nil {
s.SettingsStore.CreateUserSettings(user.ID)
}
//achievements, err := s.AchievementsStore.GetAchievementsForUser(user.ID)
//if err != nil {
// return err
//}
//
//if len(*achievements) > 0 {
// return nil
//}
//
//goals, err := s.GoalsStore.ListGoals()
//if err != nil {
// return err
//}
//
//_, err = s.AchievementsStore.CopyAchievementsFromGoals(user.ID, goals)
//if err != nil {
// return err
//}
return nil
}