totp => otp, integrate with factors, new setup form

passbook/otp/utils.py

@@ -0,0 +1,22 @@
+"""passbook OTP Utils"""
+
+from django.conf import settings
+from django.utils.http import urlencode
+
+
+def otpauth_url(accountname, secret, issuer=None, digits=6):
+    """Create otpauth according to
+    https://github.com/google/google-authenticator/wiki/Key-Uri-Format"""
+
+    accountname = accountname
+    issuer = issuer if issuer else getattr(settings, 'OTP_TOTP_ISSUER')
+
+    # Ensure that the secret parameter is the FIRST parameter of the URI, this
+    # allows Microsoft Authenticator to work.
+    query = [
+        ('secret', secret),
+        ('digits', digits),
+        ('issuer', issuer),
+    ]
+
+    return 'otpauth://totp/%s:%s?%s' % (issuer, accountname, urlencode(query))