#https://github.com/noraj/flask-session-cookie-manager/blob/master/flask_session_cookie_manager3.py 
#python3 -m pip install flask
#python3 -m pip install itsdangerous

import zlib
from itsdangerous import base64_decode
import ast
from flask.sessions import SecureCookieSessionInterface


class MockApp(object):

    def __init__(self, secret_key):
        self.secret_key = secret_key



def encode(secret_key, session_cookie_structure):

    try:
       app = MockApp(secret_key)

       session_cookie_structure = dict(ast.literal_eval(session_cookie_structure))
       si = SecureCookieSessionInterface()
       s = si.get_signing_serializer(app)

       return s.dumps(session_cookie_structure)
    except Exception as e:
        return "[Encoding error] {}".format(e)
        raise e


def decode(session_cookie_value, secret_key=None):
    try:
        if(secret_key==None):
           compressed = False
           payload = session_cookie_value

           if payload.startswith('.'):
               compressed = True
               payload = payload[1:]

           data = payload.split(".")[0]

           data = base64_decode(data)
           if compressed:
               data = zlib.decompress(data)

           return data
        else:
             app = MockApp(secret_key)
             si = SecureCookieSessionInterface()
             s = si.get_signing_serializer(app)

             return s.loads(session_cookie_value)
    except Exception as e:
           return "[Decoding error] {}".format(e)
           raise e

SECRET_KEY =  'Sup3rUnpredictableK3yPleas3Leav3mdanfe12332942'

print(decode("eyJBZG1pbiI6ImFkbWluIiwidGVzdCI6W119.YL5ioA.dSRlyDjrksMaHk-aM7xuO1KjGXg",SECRET_KEY))