upd: group the classes and export to one

src/jsotp.js

@@ -5,16 +5,47 @@
  *  @Disc     : a node module to generate and verify one-time passwords
  */
 
-import { OTP } from './otp';
 import { TOTP } from './totp';
 import { HOTP } from './hotp';
 import { Base32 } from './base32';
 import { Util } from './util';
 
+/*＊
+ * Generate and return HOTP object
+ *
+ * @param {secret}
+ * @type {String} 
+ * @desc random base32-encoded key to generate OTP.
+ *
+ * @return {OTP}
+ */
+function hotp_gen(secret, digits=6, digest="SHA-1") {
+    let hotp = new HOTP(secret, digits, digest);
+    return hotp;
+}
+
+/*＊
+ * Generate and return TOTP object
+ *
+ * @param {secret}
+ * @type {String} 
+ * @desc random base32-encoded key to generate OTP.
+ *
+ * @param {interval}
+ * @type {int} 
+ * @desc the time interval in seconds for OTP.
+ * This defaults to 30.
+ *
+ * @return {OTP}
+ */
+function totp_gen(secret, interval=30) {
+    let totp = new TOTP(secret, interval);
+    return totp;
+}
+
 export {
-    OTP,
-    TOTP,
-    HOTP,
+    hotp_gen as HOTP,
+    totp_gen as TOTP,
     Base32,
     Util
 };