moved JWT creation logic to shared package for re-usability

shared/selene_util/auth.py

@@ -1,7 +1,11 @@
+from datetime import datetime
 from logging import getLogger
+from time import time
 
 import jwt
 
+THIRTY_DAYS = 2592000
+
 _log = getLogger(__package__)
 
 
@@ -9,13 +13,32 @@ class AuthenticationError(Exception):
     pass
 
 
+def encode_auth_token(secret_key, user_uuid):
+    """
+    Generates the Auth Token
+    :return: string
+    """
+    token_expiration = time() + THIRTY_DAYS
+    payload = dict(iat=datetime.utcnow(), exp=token_expiration, sub=user_uuid)
+    selene_token = jwt.encode(
+        payload,
+        secret_key,
+        algorithm='HS256'
+    )
+
+    # before returning the token, convert it from bytes to string so that
+    # it can be included in a JSON response object
+    return selene_token.decode()
+
+
 def decode_auth_token(auth_token: str, secret_key: str) -> tuple:
     """
     Decodes the auth token
-    :param auth_token: the Selene JSON Web Token extracted from the request cookies.
+    :param auth_token: the Selene JSON Web Token extracted from cookies.
     :param secret_key: the key needed to decode the token
-    :return: two-value tuple containing a boolean value indicating if the token is good and the
-        user UUID extracted from the token.  UUID will be None if token is invalid.
+    :return: two-value tuple containing a boolean value indicating if the
+        token is good and the user UUID extracted from the token.  UUID will
+        be None if token is invalid.
     """
     try:
         payload = jwt.decode(auth_token, secret_key)