init(db): add user login and auth funcs

internal/db/db.go

@@ -27,3 +27,20 @@ func InitDB(connString string) error {
 	}
 	return nil
 }
+
+//#region Users
+
+func UserLogin(ctx context.Context, login, password string) (user_id string, err error) {
+	row := connPool.QueryRow(ctx, "SELECT id FROM users WHERE login=$1 AND password=crypt($2, password)", login, password)
+	err = row.Scan(&user_id)
+	return
+}
+
+func UserAuth(ctx context.Context, user_id string) (ok, editor bool) {
+	row := connPool.QueryRow(ctx, "SELECT editor FROM users WHERE id=$1", user_id)
+	err := row.Scan(&editor)
+	ok = (err == nil)
+	return
+}
+
+//#endregion Users