Add password hashing with argon2

internal/store/migrations/8.sql

@@ -0,0 +1,4 @@
+alter table user
+add column salt text;
+
+pragma user_version = 8;

internal/store/store.go

@@ -11,6 +11,7 @@ import (
 type Store struct {
 	db    *sql.DB
 	cakes []models.Cake
+	users map[string]models.User
 }
 
 func OpenStore(filename string) *Store {
@@ -27,6 +28,10 @@ func OpenStore(filename string) *Store {
 	if err != nil {
 		log.Fatal(err)
 	}
+	out.users, err = out.loadUsers()
+	if err != nil {
+		log.Fatal(err)
+	}
 	return &out
 }
 

internal/store/user.go

@@ -0,0 +1,48 @@
+package store
+
+import (
+	"errors"
+
+	"github.com/Bronku/iroon/internal/crypto"
+	"github.com/Bronku/iroon/internal/models"
+)
+
+func (s *Store) AddUser(login, password string) error {
+	_, exists := s.GetUser(login)
+	if exists {
+		return errors.New("the user already exists")
+	}
+	query := "insert into user (login, password, salt) values(?, ?, ?)"
+	salt := crypto.GenerateKey()
+	hash := crypto.PasswordHash(password, salt)
+	_, err := s.db.Exec(query, login, hash, salt)
+	if err == nil {
+		s.users[login] = models.User{Password: hash, Salt: salt}
+	}
+	return err
+}
+
+func (s *Store) loadUsers() (map[string]models.User, error) {
+	out := make(map[string]models.User)
+	query := "select login, password, salt from user;"
+	rows, err := s.db.Query(query)
+	if err != nil {
+		return out, err
+	}
+	defer rows.Close()
+	for rows.Next() {
+		var current models.User
+		var login string
+		err = rows.Scan(&login, &current.Password, &current.Salt)
+		if err != nil {
+			continue
+		}
+		out[login] = current
+	}
+	return out, nil
+}
+
+func (s *Store) GetUser(login string) (models.User, bool) {
+	value, ok := s.users[login]
+	return value, ok
+}