Getting basics down

internal/darkstorm_backend/user.go

@@ -0,0 +1,62 @@
+package darkstorm
+
+import (
+	"crypto/rand"
+	"encoding/base64"
+
+	"github.com/google/uuid"
+	"golang.org/x/crypto/argon2"
+)
+
+func generateSalt() (string, error) {
+	out := make([]byte, 16)
+	_, err := rand.Read(out)
+	return base64.RawStdEncoding.EncodeToString(out), err
+}
+
+type User struct {
+	Perm           map[string]string
+	ID             string
+	Username       string
+	Password       string
+	Salt           string
+	Email          string
+	PasswordChange uint64
+}
+
+func NewUser(username, password, email string) (*User, error) {
+	id, err := uuid.NewV7()
+	if err != nil {
+		return nil, err
+	}
+	salt, err := generateSalt()
+	if err != nil {
+		return nil, err
+	}
+	out := &User{
+		Perm:     make(map[string]string),
+		ID:       id.String(),
+		Username: username,
+		Salt:     salt,
+		Email:    email,
+	}
+	out.Password, err = out.HashPassword(password)
+	return out, err
+}
+
+func (u *User) HashPassword(password string) (string, error) {
+	salt, err := base64.RawStdEncoding.DecodeString(u.Salt)
+	if err != nil {
+		return "", err
+	}
+	res := argon2.IDKey([]byte(password), salt, 1, 64*1024, 4, 32)
+	return base64.RawStdEncoding.EncodeToString(res), nil
+}
+
+func (u *User) ValidatePassword(password string) (bool, error) {
+	hsh, err := u.HashPassword(password)
+	if err != nil {
+		return false, err
+	}
+	return hsh == u.Password, nil
+}